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class="xg1">回复:</span> <span class="xi1">14</span> </div> </td> <td class="plc ptm pbn vwthd sdad"> <div class="y"> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&action=printable&tid=39852" title="打印" target="_blank"><img src="static/image/common/print.png" alt="打印" class="vm" /></a> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=nextoldset&tid=39852" title="上一主题"><img src="static/image/common/thread-prev.png" alt="上一主题" class="vm" /></a> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=nextnewset&tid=39852" title="下一主题"><img src="static/image/common/thread-next.png" alt="下一主题" class="vm" /></a> </div> <span class="xg1 side_btn"> <a onclick="setcookie('close_leftinfo', 1);location.reload();" title="收起左侧" class="btn_s_close" href="javascript:;"><img src="template/focaloptics/image/control_l.png" alt="收起左侧" class="vm" /></a> </span> <h1 class="ts"> <span id="thread_subject">请教：利用光电倍增管测到一个信号，想将其中的直流信号滤掉</span> </h1> <span class="xg1"> <a href="http://bbs.oecr.com/thread-39852-1-1.html" onclick="return copyThreadUrl(this, '光电工程师社区')" >[复制链接]</a> </span> </td> </tr> </table> <table cellspacing="0" cellpadding="0" class="ad"> <tr> <td class="pls"> </td> <td class="plc"> </td> </tr> </table><div class="postaaa posta0" id="post_280851" ><table id="pid280851" class="plhin" summary="pid280851" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar280851" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-36249.html" target="_blank" class="xw1" style="color: #33CC00">laserslp</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo280851" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo280851_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-36249.html" target="_blank" class="xi2" style="color: #33CC00">laserslp</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=36249&do=profile" target="_blank" class="xi2">191</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=36249&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=laserslp" id="a_showip_li_280851" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=laserslp" id="a_repent_280851" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-36249.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=36249&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <div id="fj" class="y"> <label class="z">电梯直达</label> <input type="text" class="px p_fre z" size="2" onkeyup="$('fj_btn').href='forum.php?mod=redirect&ptid=39852&authorid=0&postno='+this.value" onkeydown="if(event.keyCode==13) {window.location=$('fj_btn').href;return false;}" title="跳转到指定楼层" /> <a href="javascript:;" id="fj_btn" class="z" title="跳转到指定楼层"><img src="static/image/common/fj_btn.png" alt="跳转到指定楼层" class="vm" /></a> </div> <strong> <a href="http://bbs.oecr.com/thread-39852-1-1.html" id="postnum280851" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>1</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon280851" src="static/image/common/online_member.gif" /> <em id="authorposton280851">发表于 2005-10-25 02:41:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=39852&page=1&authorid=36249" rel="nofollow">只看该作者</a> <span class="none"><img src="static/image/common/arw_r.gif" class="vm" alt="回帖奖励" /></span> <span class="pipe show">|</span><a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=39852&extra=&ordertype=1" class="show">倒序浏览</a> <span class="pipe show">|</span><a href="javascript:;" onclick="readmode($('thread_subject').innerHTML, 280851);" class="show">阅读模式</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_280851"> 利用光电倍增管测到一个信号，想将其中的直流信号滤掉，请问用什么样的方法较好。谢谢各位</td></tr></table> </div> <div id="comment_280851" class="cm"> </div> <div id="post_rate_div_280851"></div> </div> </div> </td></tr> <tr><td class="plc plm"> <div id="p_btn" class="mtw mbm hm cl"> <a 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$('collectionnumber').innerHTML + ' 人淘帖'" title="淘好帖进专辑"><i><img src="static/image/common/collection.png" alt="分享" />淘帖<span id="collectionnumber" style="display:none">0</span></i></a> <a id="recommend_add" href="forum.php?mod=misc&action=recommend&do=add&tid=39852&hash=184f8896" onclick="showWindow('login', this.href)" onmouseover="this.title = $('recommendv_add').innerHTML + ' 人支持'" title="顶一下"><i><img src="static/image/common/rec_add.gif" alt="支持" />支持<span id="recommendv_add" style="display:none">0</span></i></a> <a id="recommend_subtract" href="forum.php?mod=misc&action=recommend&do=subtract&tid=39852&hash=184f8896" onclick="showWindow('login', this.href)" onmouseover="this.title = $('recommendv_subtract').innerHTML + ' 人反对'" title="踩一下"><i><img src="static/image/common/rec_subtract.gif" alt="反对" />反对<span id="recommendv_subtract" style="display:none">0</span></i></a> </div> </td> </tr> <tr id="_postposition280851"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=16&tid=39852&reppost=280851&extra=&page=1" onclick="showWindow('reply', this.href)">回复</a> </em> <p> <a href="javascript:;" id="mgc_post_280851" onmouseover="showMenu(this.id)" class="showmenu">使用道具</a> <a href="javascript:;" onclick="showWindow('miscreport280851', 'misc.php?mod=report&rtype=post&rid=280851&tid=39852&fid=16', 'get', -1);return false;">举报</a> </p> <ul id="mgc_post_280851_menu" class="p_pop mgcmn" style="display: none;"> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=bump&idtype=tid&id=39852" id="a_bump" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/bump.small.gif" />提升卡</a></li> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=stick&idtype=tid&id=39852" id="a_stick" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/stick.small.gif" />置顶卡</a></li> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=close&idtype=tid&id=39852" id="a_stick" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/close.small.gif" />沉默卡</a></li> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=open&idtype=tid&id=39852" id="a_stick" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/open.small.gif" />喧嚣卡</a></li> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=highlight&idtype=tid&id=39852" id="a_stick" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/highlight.small.gif" />变色卡</a></li> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=sofa&idtype=tid&id=39852" id="a_stick" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/sofa.small.gif" />抢沙发</a></li> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=jack&idtype=tid&id=39852" id="a_jack" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/jack.small.gif" />千斤顶</a></li> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=namepost&idtype=pid&id=280851:39852" id="a_namepost_280851" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/namepost.small.gif" />显身卡</a><li> </ul> <script type="text/javascript" reload="1">checkmgcmn('post_280851')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta1" id="post_280982" ><table id="pid280982" class="plhin" summary="pid280982" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar280982" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-24536.html" target="_blank" class="xw1" style="color: #FF00CC">lymex</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo280982" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo280982_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-24536.html" target="_blank" class="xi2" style="color: #FF00CC">lymex</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=24536&do=profile" target="_blank" class="xi2">2575</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=24536&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=lymex" id="a_showip_li_280982" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=lymex" id="a_repent_280982" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-24536.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=24536&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=39852&pid=280982" id="postnum280982" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>2</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon280982" src="static/image/common/online_member.gif" /> <em id="authorposton280982">发表于 2005-10-25 20:14:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=39852&page=1&authorid=24536" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_280982"> 用电容，或者直流偏移。</td></tr></table> </div> <div id="comment_280982" class="cm"> </div> <div id="post_rate_div_280982"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition280982"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=16&tid=39852&repquote=280982&extra=&page=1" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=39852&pid=280982&hash=184f8896" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_280982').innerHTML ? $('review_support_280982').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_280982"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=39852&pid=280982&hash=184f8896" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_against_280982').innerHTML ? $('review_against_280982').innerHTML : 0) + ' 人 反对'">反对 <span id="review_against_280982"></span></a> </em> <p> <a href="javascript:;" id="mgc_post_280982" onmouseover="showMenu(this.id)" class="showmenu">使用道具</a> <a href="javascript:;" onclick="showWindow('miscreport280982', 'misc.php?mod=report&rtype=post&rid=280982&tid=39852&fid=16', 'get', -1);return false;">举报</a> </p> <ul id="mgc_post_280982_menu" class="p_pop mgcmn" style="display: none;"> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=namepost&idtype=pid&id=280982:39852" id="a_namepost_280982" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/namepost.small.gif" />显身卡</a><li> </ul> <script type="text/javascript" reload="1">checkmgcmn('post_280982')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta2" id="post_281135" ><table id="pid281135" class="plhin" summary="pid281135" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar281135" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-36249.html" target="_blank" class="xw1" style="color: #33CC00">laserslp</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo281135" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo281135_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-36249.html" target="_blank" class="xi2" style="color: #33CC00">laserslp</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=36249&do=profile" target="_blank" class="xi2">191</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=36249&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=laserslp" id="a_showip_li_281135" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=laserslp" id="a_repent_281135" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-36249.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=36249&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=39852&pid=281135" id="postnum281135" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>3</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon281135" src="static/image/common/ico_lz.png" /> 楼主<span class="pipe">|</span> <em id="authorposton281135">发表于 2005-10-26 22:35:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=39852&page=1&authorid=36249" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_281135"> 具体怎么用啊？能说一说么，或者介绍一些相关的书。</td></tr></table> </div> <div id="comment_281135" class="cm"> </div> <div id="post_rate_div_281135"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition281135"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=16&tid=39852&repquote=281135&extra=&page=1" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=39852&pid=281135&hash=184f8896" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_281135').innerHTML ? $('review_support_281135').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_281135"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=39852&pid=281135&hash=184f8896" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_against_281135').innerHTML ? $('review_against_281135').innerHTML : 0) + ' 人 反对'">反对 <span id="review_against_281135"></span></a> </em> <p> <a href="javascript:;" id="mgc_post_281135" onmouseover="showMenu(this.id)" class="showmenu">使用道具</a> <a href="javascript:;" onclick="showWindow('miscreport281135', 'misc.php?mod=report&rtype=post&rid=281135&tid=39852&fid=16', 'get', -1);return false;">举报</a> </p> <ul id="mgc_post_281135_menu" class="p_pop mgcmn" style="display: none;"> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=namepost&idtype=pid&id=281135:39852" id="a_namepost_281135" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/namepost.small.gif" />显身卡</a><li> </ul> <script type="text/javascript" reload="1">checkmgcmn('post_281135')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta3" id="post_281173" ><table id="pid281173" class="plhin" summary="pid281173" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar281173" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-24536.html" target="_blank" class="xw1" style="color: #FF00CC">lymex</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo281173" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo281173_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-24536.html" target="_blank" class="xi2" style="color: #FF00CC">lymex</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=24536&do=profile" target="_blank" class="xi2">2575</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=24536&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=lymex" id="a_showip_li_281173" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=lymex" id="a_repent_281173" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span 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id="postmessage_281173"> 说说你用在什么条件下？最后的输出是什么？</td></tr></table> </div> <div id="comment_281173" class="cm"> </div> <div id="post_rate_div_281173"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition281173"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=16&tid=39852&repquote=281173&extra=&page=1" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=39852&pid=281173&hash=184f8896" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_281173').innerHTML ? $('review_support_281173').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_281173"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=39852&pid=281173&hash=184f8896" onclick="showWindow('login', this.href)" 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href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=laserslp" id="a_showip_li_281218" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=laserslp" id="a_repent_281218" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-36249.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=36249&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=39852&pid=281218" id="postnum281218" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>5</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon281218" src="static/image/common/ico_lz.png" /> 楼主<span class="pipe">|</span> <em id="authorposton281218">发表于 2005-10-27 17:06:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=39852&page=1&authorid=36249" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_281218"> 测量水中小粒子的后向散射光，现在是将一连续的蓝绿光照射到水中，利用光电倍增管测量信号，在示波器上观察到的是一系列的脉冲，但仍然含有直流成分，所以想将其中的直流部分滤掉，然后再用数据采集卡进行采用，求出平均值。图片太大，上传不上来。<br /> 用电容滤波的话，存在几个问题：<br /> 1、电路需要自己搭建，还是能买到滤波器<br /> 2、这个滤波电容的大小怎么确定，是不是还应该用到电感。<br /> 3、电容是不是应该接在光电倍增管之后，然后再使滤波后的电信号进入示波器，后者数据采集卡<br /> 我现在就想到这几个问题，可能不是很周全，还望多多指教。</td></tr></table> </div> <div id="comment_281218" class="cm"> </div> <div id="post_rate_div_281218"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr 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src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=lymex" id="a_repent_281370" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-24536.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=24536&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=39852&pid=281370" id="postnum281370" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>6</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon281370" src="static/image/common/online_member.gif" /> <em id="authorposton281370">发表于 2005-10-28 07:49:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=39852&page=1&authorid=24536" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_281370"> <P>0、如果光不是很暗或者对响应时间要求不是很高，可否采用光电二极管替代光电倍增管，这样成本、电路都节约。<BR>1、应该是一个简单的RC就可以，看要求的响应时间或者脉冲上升下降时间来选择参数。<BR>2、比如响应时间要求1ms、采集卡输入阻抗10k，那么电容可以选择0.01微法，电阻就选10k。不需要电感<BR>3、光电倍增管应该有个负载电阻，电容一端接到负载电阻，另一端接10k（同时为输出，自然作为示波器的采样点），10k的一端接地。</P></td></tr></table> </div> <div id="comment_281370" class="cm"> </div> <div id="post_rate_div_281370"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition281370"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" 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card_gender_" id="userinfo281679" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo281679_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-36249.html" target="_blank" class="xi2" style="color: #33CC00">laserslp</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=36249&do=profile" target="_blank" class="xi2">191</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=36249&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=laserslp" id="a_showip_li_281679" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=laserslp" id="a_repent_281679" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-36249.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=36249&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=39852&pid=281679" id="postnum281679" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>7</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon281679" src="static/image/common/ico_lz.png" /> 楼主<span class="pipe">|</span> <em id="authorposton281679">发表于 2005-10-30 17:28:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=39852&page=1&authorid=36249" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_281679"> <P>谢谢你了！</P> <P>按照你给出的参数，</P> <P>滤波电路的截止频率为f=1/(2πRC)=1592Hz，而响应时间为1ms，对应的频率是不是应该为1000Hz，这样的话这个频率是不是被滤掉了？</P> <P>我的信号的脉冲宽度大约在5ms左右，数据采集卡的阻抗还不知道。数据采集卡的阻抗与电阻和电容的选择有什么关系么？滤波电路和光电倍增管组成的电路的阻抗和数据采集卡的阻抗一定要相匹配么？</P> <P>我找了一些书，但没找到具体的计算公式。应该看看电路理论的书么？</P></td></tr></table> </div> <div id="comment_281679" class="cm"> </div> <div id="post_rate_div_281679"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition281679"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=16&tid=39852&repquote=281679&extra=&page=1" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" 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href="http://club.oecr.com/space-uid-36249.html" target="_blank" class="xi2" style="color: #33CC00">laserslp</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=36249&do=profile" target="_blank" class="xi2">191</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=36249&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=laserslp" id="a_showip_li_281680" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=laserslp" id="a_repent_281680" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-36249.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=36249&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=39852&pid=281680" id="postnum281680" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>8</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon281680" src="static/image/common/ico_lz.png" /> 楼主<span class="pipe">|</span> <em id="authorposton281680">发表于 2005-10-30 17:30:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=39852&page=1&authorid=36249" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_281680"> 具体都用到什么样的公式呀？谢谢!</td></tr></table> </div> <div id="comment_281680" class="cm"> </div> <div id="post_rate_div_281680"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition281680"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=16&tid=39852&repquote=281680&extra=&page=1" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=39852&pid=281680&hash=184f8896" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_281680').innerHTML ? $('review_support_281680').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_281680"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=39852&pid=281680&hash=184f8896" onclick="showWindow('login', this.href)" 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<div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon281752" src="static/image/common/online_member.gif" /> <em id="authorposton281752">发表于 2005-10-31 12:57:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=39852&page=1&authorid=7854" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_281752"> <P> 光电倍增管是高灵敏接收器件，其输出电流与其接收的光照度成正比。为此必须在（通常是阴极）输出端对地连接电阻或由高输入阻抗运放制作的直流电流-电压转换器，将光信号转换成电压信号。也可以在其后采用电容隔直，去除信号的直流成分。</P> <P>1、信号采集： </P> <P> 作为光电检测仪器来说，我认为采用直流放大处理信号最好。相关做法简述如下：</P> <P> 通常，作为电流-电压转换的电阻取值为1-10M Ohm，最常用的是1M Ohm。或使用（场效应管为输入级的低躁声）高输入阻抗运放用做电流-电压转换器，此时转换电阻同上。</P> <P> 紧接着的（电压）信号放大器。请注意信号的阻抗匹配：</P> <P>（1）、使用电阻电流-电压转换器时，接着的电压放大器必须是场效应管为输入级的运放或高输入阻抗直流放大器电路。</P> <P>（2）、使用场效应管为输入级的运放作为电流-电压转换器时，接着的电压放大器只要一般低躁声运放。</P> <P>请特别注意以上电流-电压转换电路分布参数、电源滤波以及输出信号设置。最好将输出信号级的输出阻抗做到1K Ohm以下。避免长线传输到信号采集卡途中串入干扰信号。</P> <P>2、去除信号的直流成分：</P> <P>最好采取调制信号源的方式，或机械斩波或脉冲驱动检测光源的方式。结合信号采集卡实现同步检波的方式，即：以光源和信号同步方式进行，信号+直流成份-直流成份的办法扣除（包含直流漂移等）“背景”的方式直接获得稳定信号。</P> <P> 。。。。，经验获得不容易，尤其是坚持许久做一件事！。。说起来话长，以上意见请参考！</P></td></tr></table> </div> <div id="comment_281752" class="cm"> </div> <div id="post_rate_div_281752"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition281752"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=16&tid=39852&repquote=281752&extra=&page=1" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=39852&pid=281752&hash=184f8896" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_281752').innerHTML ? $('review_support_281752').innerHTML : 0) + ' 人 支持'">支持 <span 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reload="1">checkmgcmn('post_281752')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta9" id="post_437298" ><table id="pid437298" class="plhin" summary="pid437298" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar437298" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-66786.html" target="_blank" class="xw1" style="color: #003366">ayu2000</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo437298" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo437298_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-66786.html" target="_blank" class="xi2" style="color: #003366">ayu2000</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=66786&do=profile" target="_blank" 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class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=39852&pid=437298" id="postnum437298" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>10</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon437298" src="static/image/common/online_member.gif" /> <em id="authorposton437298">发表于 2008-3-22 22:28:07</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=39852&page=1&authorid=66786" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_437298"> 楼上说的不错啊，我现在也在研究这个，但是不是太了解，学习学习</td></tr></table> </div> <div id="comment_437298" class="cm"> </div> <div id="post_rate_div_437298"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition437298"></tr> <tr> <td class="pls"></td> <td class="plc" 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#33CC00">michael-zhang</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo442222" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo442222_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-54180.html" target="_blank" class="xi2" style="color: #33CC00">michael-zhang</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=54180&do=profile" target="_blank" class="xi2">175</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=54180&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=michael-zhang" id="a_showip_li_442222" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=michael-zhang" id="a_repent_442222" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-54180.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54180&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=39852&pid=442222" id="postnum442222" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>11</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon442222" src="static/image/common/online_member.gif" /> <em id="authorposton442222">发表于 2008-4-9 17:35:33</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=39852&page=1&authorid=54180" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_442222"> 现在有硅基的光电倍增管，噪声很低，如果经费允许的话就可以买个试一试。还有就是可以考虑买个锁相放大器和斩波器。</td></tr></table> </div> <div id="comment_442222" class="cm"> </div> <div id="post_rate_div_442222"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition442222"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=16&tid=39852&repquote=442222&extra=&page=1" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=39852&pid=442222&hash=184f8896" onclick="showWindow('login', this.href)" onmouseover="this.title = 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src="static/image/magic/namepost.small.gif" />显身卡</a><li> </ul> <script type="text/javascript" reload="1">checkmgcmn('post_442222')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta11" id="post_539031" ><table id="pid539031" class="plhin" summary="pid539031" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar539031" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-75532.html" target="_blank" class="xw1" style="color: #003366">好了</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo539031" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo539031_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-75532.html" target="_blank" class="xi2" style="color: #003366">好了</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=75532&do=profile" target="_blank" class="xi2">22</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=75532&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=%BA%C3%C1%CB" id="a_showip_li_539031" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=%BA%C3%C1%CB" id="a_repent_539031" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-75532.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=75532&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=39852&pid=539031" id="postnum539031" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>12</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon539031" src="static/image/common/online_member.gif" /> <em id="authorposton539031">发表于 2009-4-5 15:00:33</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=39852&page=1&authorid=75532" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_539031"> ling jiao..[code][/code]</td></tr></table> </div> <div id="comment_539031" class="cm"> </div> <div id="post_rate_div_539031"></div> </div> </div> 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