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id="imagelistthumb" style="width: 220px; left: 0px;"><img src="static/image/common/loading.gif" width="16" height="16" class="vm" /> 组图打开中，请稍候......</ul> <a id="currentpic" class="mask" href="javascript:void(0)" style="left: 0px;"></a> </div> <a id="goright" class="right" onclick="imagelist_go('next');" href="javascript:void(0);"></a> </div> </div> </div> <script type="text/javascript" reload="1"> var imagewidth = 110; var curnum = 0; var imagecount = '2'; function imagelist_go(type) { var width = '220'; var left = parseInt($('imagelistthumb').style.left.substr(0, ($('imagelistthumb').style.left.length - 2))); var curleft = parseInt($('currentpic').style.left.substr(0, ($('imagelistthumb').style.left.length - 2))); if(type == 'next') { if(left > -(width - 730)) { newleft = imagewidth * 4; if(left - newleft < -(width - 730)) { newleft = width - 730 - left; } imagelist_scrolleft('imagelistthumb', left, newleft); imagelist_scrolleft('currentpic', curleft, newleft); } } else { if(left < 0) { newleft = imagewidth * 4; if(left + newleft > 0) { newleft = -left; } imagelist_scrolleft('imagelistthumb', left, newleft, 'add'); imagelist_scrolleft('currentpic', curleft, newleft, 'add'); } } } function imagelist_scrolleft(id, left, num, type) { if(type == 'add') { left += num; } else { left -= num; } $(id).style.left = left +'px'; } function current_pic(n) { curnum = n; var left = parseInt($('imagelistthumb').style.left.substr(0, ($('imagelistthumb').style.left.length - 2))); $('pic').src=imglist['url'][n]; var curleft = imagewidth * n; if(imagecount > 7 && n >= 4) { if(n < (imagecount - 4)) { curleft = imagewidth * 3; imagelist_scrolleft('imagelistthumb', 0, imagewidth * (n-3)); } else { curleft = imagewidth * (7 - (imagecount - n)); imagelist_scrolleft('imagelistthumb', 0, imagewidth * (imagecount-7)); } } else { imagelist_scrolleft('imagelistthumb', 0, 0); } $('currentpic').style.left = curleft+'px'; }var imagelistkey = '1786365c64299fae'; var imglist = new Array(); var imagelist_html = ''; imglist['aid'] = ['53598','53599']; imglist['url'] = ['data/attachment/forum/201007/07/154329xyrf6ywfpletmpff.jpg','data/attachment/forum/201007/07/154347hakghes8xxiamsmn.jpg']; var count = imglist['aid'].length; for(i = 0; i < count; i++) { imagelist_html += '<li><div class="">' +'<img src="forum.php?mod=image&aid=' + imglist['aid'][i] + '&size=100x100&key=' + imagelistkey + '&atid=104814" width="100" height="100" onclick="current_pic('+i+');"/><span>'+(i+1)+'/'+count+'</span></div></li>'; } $('imagelistthumb').innerHTML = imagelist_html; function createElem(e){ var obj = document.createElement(e); obj.style.position = 'absolute'; obj.style.zIndex = '1'; obj.style.cursor = 'pointer'; obj.onmouseout = function(){ this.style.background = 'none';} return obj; } function viewPhoto(){ var divappend = 0; if(!$('pic-prev')) { var pager = createElem('div'); var pre = createElem('div'); var next = createElem('div'); pager.id='pager'; pre.id='pic-prev'; next.id='pic-next'; divappend = 1; } else { var pager = $('pager'); var pre = $('pic-prev'); var next = $('pic-next'); } var cont = $('photo_pic'); var tar = $('pic'); var w = 390; var objpos = fetchOffset(tar); pager.style.position = 'absolute'; pager.style.left = '0px'; pager.style.top = '0px'; pager.style.width = '780px'; pager.style.height = tar.height + 'px'; pre.style.left = 0; next.style.right = 0; pre.style.width = next.style.width = w + 'px'; pre.style.height = next.style.height = tar.height + 'px'; pre.innerHTML = next.innerHTML = '<img src="static/image/common/emp.gif" width="' + w + '" height="' + tar.height + '" />'; pre.onmouseover = function(){ this.style.background = 'url(static/image/common/pic-prev.png) no-repeat 0 50%'; } pre.onclick = function(){if(curnum>=1) {$('pic').src=imglist['url'][curnum-1];current_pic(curnum-1);}} pre.title = ''; next.onmouseover = function(){ this.style.background = 'url(static/image/common/pic-next.png) no-repeat 100% 50%'; } next.onclick = function(){if(curnum < imagecount - 1) {$('pic').src=imglist['url'][curnum+1];current_pic(curnum+1);}} next.title = ''; //cont.style.position = 'relative'; if(divappend == 1) { cont.appendChild(pager); pager.appendChild(pre); pager.appendChild(next); } } var onopen = 0; $('pic').onload = function(){ viewPhoto(); if(onopen == 0) { onopen = 1; } else { var imagepos = fetchOffset($('photo_pic')); document.documentElement.scrollTop = imagepos['top']; } } document.onkeyup = function(e){ e = e ? e : window.event; var tagname = BROWSER.ie ? e.srcElement.tagName : e.target.tagName; if(tagname == 'INPUT' || tagname == 'TEXTAREA') return; actualCode = e.keyCode ? e.keyCode : e.charCode; if(actualCode == 39) { $('pic-next').click(); } if(actualCode == 37) { $('pic-prev').click(); } } </script> <div id="p_btn" class="mtw mbm cl xs1" style="display:none;"> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=share&type=thread&id=104814" id="k_share" onclick="showWindow(this.id, this.href, 'get', 0);" onmouseover="this.title = $('sharenumber').innerHTML + ' 人分享'"><i><img src="static/image/common/oshr.png" alt="分享" />分享<span id="sharenumber">0</span></i></a> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=favorite&type=thread&id=104814" id="k_favorite" onclick="showWindow(this.id, this.href, 'get', 0);" onmouseover="this.title = $('favoritenumber').innerHTML + ' 人收藏'"><i><img src="static/image/common/fav.gif" alt="收藏" />收藏<span id="favoritenumber">0</span></i></a> <a id="recommend_add" href="forum.php?mod=misc&action=recommend&do=add&tid=104814&hash=f1c61ed5" onclick="showWindow('login', this.href)" onmouseover="this.title = $('recommendv_add').innerHTML + ' 人支持'"><i><img src="static/image/common/rec_add.gif" alt="支持" />支持<span id="recommendv_add">0</span></i></a> <a id="recommend_subtract" href="forum.php?mod=misc&action=recommend&do=subtract&tid=104814&hash=f1c61ed5" onclick="showWindow('login', this.href)" onmouseover="this.title = $('recommendv_subtract').innerHTML + ' 人反对'"><i><img src="static/image/common/rec_subtract.gif" alt="反对" />反对<span id="recommendv_subtract">0</span></i></a> </div> </td> <td valign="top" class="album_side_r"> <div class="album_side"> <div class="hm mtn mbn"> <a href="http://club.oecr.com/space-uid-94514.html" target="_blank" class="xi2"><img src="http://www.oecr.com/uc_server/avatar.php?uid=94514&size=small" /></a> <span class="tit_author"> <a href="http://club.oecr.com/space-uid-94514.html">inter--diff</a> </span> </div> <div class="date"><span>发布时间:</span> 2010-7-7 15:44</div> <div class="album_info"> <h3>正文摘要: </h3> <p>大家帮忙看看，怎么样？我看不太懂，有明白的解释下。谢谢啦！</p> </div> </div> </td> </tr> </table> </div> </div> <div class="bm vw pl" id="comment"> <div class="bm_h cl"> <h2>回复</h2> </div> <div class="bm_c"> <div id="postlistreply" class="xld xlda mbm"><div id="post_new" class="viewthread_table" style="display: none"></div></div><div id="post_659108" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-95377.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=95377&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-95377.html" target="_blank" class="xi2">sugar-mm</a><em id="author_659108"> 发表于</em> <span class="xg1 xw0">2010-7-29 08:48:21</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_659108"> 我顶你个肺啊！<br /> <br /> 我顶你个肺啊！<br /> <br /> 我顶你个肺啊！</td></tr></table> </div> <div id="comment_659108" class="cm"> </div> <div id="post_rate_div_659108"></div> </div> </dd> </dl> </div> <div id="post_658933" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-83803.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=83803&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-83803.html" target="_blank" class="xi2">弥勒</a><em id="author_658933"> 发表于</em> <span class="xg1 xw0">2010-7-28 14:52:19</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_658933"> <i class="pstatus"> 本帖最后由 弥勒 于 2010-7-28 15:11 编辑 </i><br /> <br /> 关于这两张图，有点疑问。<br /> 首先两附图的波形的幅度单位是毫伏，不是功率单位。到底是功率的取样波形还是电源电压的波形或者电流的取样波形。如果是功率的取样波形的话，最好提供一下功率和电压的转换公式。还有顺便公布一下用的什么探头。<br /> 另外，也是很重要的问题，图片左边的标有“1”的三角，是测试信号的零电位。所以说，两幅图跟本就不是同一个信号。第一幅图的直流平均值大概也就5mV以下（如果测的是交流信号的话，波形会平均分布在零位两边，不会偏到上面去），第二幅图的有直流平均值有400多mV。如果确实是这样，这个噪声就算得很搞笑了。希望楼主好好确认一下，别被人忽悠了。</td></tr></table> </div> <div id="comment_658933" class="cm"> </div> <div id="post_rate_div_658933"></div> </div> </dd> </dl> </div> <div id="post_658835" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-94199.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=94199&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-94199.html" target="_blank" class="xi2">laserfan</a><em id="author_658835"> 发表于</em> <span class="xg1 xw0">2010-7-28 09:19:47</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_658835"> 用单纵模(单频)激光器,噪声就可以更好了.<br /> 不过SLM/SF激光器价格很贵.<br /> 我用过SF 的RGB激光做彩色全息，效果很好。<br /> 国内产品在<a href="http://www.cnilaser.com/single%20mode.html" target="_blank">http://www.cnilaser.com/single%20mode.html</a>上有。</td></tr></table> </div> <div id="comment_658835" class="cm"> </div> <div id="post_rate_div_658835"></div> </div> </dd> </dl> </div> <div id="post_657931" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-114756.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=114756&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-114756.html" target="_blank" class="xi2">DPlaser</a><em id="author_657931"> 发表于</em> <span class="xg1 xw0">2010-7-22 13:05:10</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_657931"> 楼上的，是谁家的激光器，超声还不错，看起来！</td></tr></table> </div> <div id="comment_657931" class="cm"> </div> <div id="post_rate_div_657931"></div> </div> </dd> </dl> </div> <div id="post_655933" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-94199.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=94199&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-94199.html" target="_blank" class="xi2">laserfan</a><em id="author_655933"> 发表于</em> <span class="xg1 xw0">2010-7-12 09:14:02</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_655933"> noise= pk-pk/mean. <br /> 如果是+/-，需要再/2。<br /> pk-pk noise一般是rms值的2倍。<br /> 因此，上述激光器噪声rms值为0.2%以内。<br /> </td></tr></table> </div> <div id="comment_655933" class="cm"> </div> <div id="post_rate_div_655933"></div> </div> </dd> </dl> </div> </div> </div> </div> <script type="text/javascript"> new lazyload(); </script> <div class="wp mtn"> <!--[diy=diy3]--><div id="diy3" class="area"></div><!--[/diy]--> </div></div> </div> <!--autocomment filter by maxnum--> <div class="ft_wp"> <div id="ft" class=" cl"> <div id="flk" > <p> <a href="http://wpa.qq.com/msgrd?V=3&Uin=20600600&Site=光电工程师社区&Menu=yes&from=discuz" target="_blank" title="QQ"><img src="static/image/common/site_qq.jpg" alt="QQ" /></a><span class="pipe">|</span><a href="http://m.oecr.com" >手机版</a><span class="pipe">|</span><a href="http://so.oecr.com" title="站内搜索" target="_blank" >搜索</a><span class="pipe">|</span><a href="http://www.focaloptics.com" title="主办单位：武汉焦点光学技术有限公司" target="_blank" >焦点光学</a><span class="pipe">|</span><a href="http://www.oecr.com" target="_blank">光电工程师社区</a> ( 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