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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-59042.html" target="_blank" class="xi2"><img src="http://www.oecr.com/uc_server/avatar.php?uid=59042&size=small" /></a> <span class="tit_author"> <a href="http://club.oecr.com/space-uid-59042.html">550482055</a> </span> </div> <div class="date"><span>发布时间:</span> 2009-3-13 10:16</div> <div class="album_info"> <h3>正文摘要: </h3> <p>各位，帮忙分析一下，这个chopper的作用是什么？</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_534165" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-73803.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=73803&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-73803.html" target="_blank" class="xi2">laodisi</a><em id="author_534165"> 发表于</em> <span class="xg1 xw0">2009-3-19 11:15:36</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_534165"> 应该是微弱信号检测方面的东西，譬如说锁相器、取样积分器等等吧~~~~~~~~</td></tr></table> </div> <div id="comment_534165" class="cm"> </div> <div id="post_rate_div_534165"></div> </div> </dd> </dl> </div> <div id="post_532710" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-59042.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=59042&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-59042.html" target="_blank" class="xi2">550482055</a><em id="author_532710"> 发表于</em> <span class="xg1 xw0">2009-3-14 08:07:22</span> </dt> <dd class="z"><div class="pcb"> <div class="locked">提示: <em>作者被禁止或删除 内容自动屏蔽</em></div> </div> </dd> </dl> <script type="text/javascript" reload="1"> aimgcount[532710] = ['buYOY']; attachimggroup(532710); </script> </div> <div id="post_532683" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-86573.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=86573&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-86573.html" target="_blank" class="xi2">wzhiyf</a><em id="author_532683"> 发表于</em> <span class="xg1 xw0">2009-3-13 22:16:20</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_532683"> 谢楼上支持，明白人啊</td></tr></table> </div> <div id="comment_532683" class="cm"> </div> <div id="post_rate_div_532683"></div> </div> </dd> </dl> </div> <div id="post_532673" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-10316.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=10316&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-10316.html" target="_blank" class="xi2">再也不能这样</a><em id="author_532673"> 发表于</em> <span class="xg1 xw0">2009-3-13 22:02:36</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_532673"> <div class="quote"><blockquote>看到后面的 LOCK-IN 了么？ CHOPPER 以一定的频率转动，相当是给光信号一个频率为F的调整，CHOPPER同时给LOCK-IN一个参考信号，用于解调PMT出来的电信号。<br /> <font size="2"><font color="#999999">wzhiyf 发表于 2009-3-13 17:25</font> <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=532508&ptid=84115" target="_blank"><img id="aimg_lkY5s" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" file="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" lazyloadthumb="1" border="0" alt="" /></a></font></blockquote></div><br /> 正解。是用于探测微弱信号，可以将信噪比提高几个数量级。<br /> 找点锁相检测，相干检测方面的原理看看就明白了。</td></tr></table> </div> <div id="comment_532673" class="cm"> </div> <div id="post_rate_div_532673"></div> </div> </dd> </dl> <script type="text/javascript" reload="1"> aimgcount[532673] = ['lkY5s']; attachimggroup(532673); </script> </div> <div id="post_532661" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-86573.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=86573&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-86573.html" target="_blank" class="xi2">wzhiyf</a><em id="author_532661"> 发表于</em> <span class="xg1 xw0">2009-3-13 21:50:15</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_532661"> 呵呵，楼主，我说的你还不信。</td></tr></table> </div> <div id="comment_532661" class="cm"> </div> <div id="post_rate_div_532661"></div> </div> </dd> </dl> </div> <div id="post_532642" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-59042.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=59042&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-59042.html" target="_blank" class="xi2">550482055</a><em id="author_532642"> 发表于</em> <span class="xg1 xw0">2009-3-13 21:18:58</span> </dt> <dd class="z"><div class="pcb"> <div class="locked">提示: <em>作者被禁止或删除 内容自动屏蔽</em></div> </div> </dd> </dl> </div> <div id="post_532640" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-57450.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=57450&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-57450.html" target="_blank" class="xi2">郁闷</a><em id="author_532640"> 发表于</em> <span class="xg1 xw0">2009-3-13 21:18:21</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_532640"> 我认为是提供一定频率的光的<br /> 频率和转速以及齿轮的密度有关系</td></tr></table> </div> <div id="comment_532640" class="cm"> </div> <div id="post_rate_div_532640"></div> </div> </dd> </dl> </div> <div id="post_532512" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-86573.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=86573&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-86573.html" target="_blank" class="xi2">wzhiyf</a><em id="author_532512"> 发表于</em> <span class="xg1 xw0">2009-3-13 17:35:13</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_532512"> <strong> <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=532303&ptid=84115" target="_blank">1#</a> <i>550482055</i> </strong><br /> <br /> <br /> CCD, LOCK-IN ,CHOPPER, 我这里都有，光电类的东西，欢迎联系。</td></tr></table> </div> <div id="comment_532512" class="cm"> </div> <div id="post_rate_div_532512"></div> </div> </dd> </dl> </div> <div id="post_532510" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-86573.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=86573&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-86573.html" target="_blank" class="xi2">wzhiyf</a><em id="author_532510"> 发表于</em> <span class="xg1 xw0">2009-3-13 17:30:54</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_532510"> 以本人粗浅理解，这是个激光诱导荧光的试验。</td></tr></table> </div> <div id="comment_532510" class="cm"> </div> <div id="post_rate_div_532510"></div> </div> </dd> </dl> </div> <div id="post_532508" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-86573.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=86573&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-86573.html" target="_blank" class="xi2">wzhiyf</a><em id="author_532508"> 发表于</em> <span class="xg1 xw0">2009-3-13 17:25:32</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_532508"> 看到后面的 LOCK-IN 了么？ CHOPPER 以一定的频率转动，相当是给光信号一个频率为F的调整，CHOPPER同时给LOCK-IN一个参考信号，用于解调PMT出来的电信号。</td></tr></table> </div> <div id="comment_532508" class="cm"> </div> <div id="post_rate_div_532508"></div> </div> </dd> </dl> </div> <div id="post_532492" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-59042.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=59042&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-59042.html" target="_blank" class="xi2">550482055</a><em id="author_532492"> 发表于</em> <span class="xg1 xw0">2009-3-13 17:00:30</span> </dt> <dd class="z"><div class="pcb"> <div class="locked">提示: <em>作者被禁止或删除 内容自动屏蔽</em></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" 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