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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); } $('currentpic').style.left = curleft+'px'; }var imagelistkey = '4cb5b7e439b6bfe7'; var imglist = new Array(); var 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= function(){if(curnum < imagecount - 1) {$('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=83370" 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=83370" 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=83370&hash=f992d598" 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=83370&hash=f992d598" 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-29263.html" target="_blank" class="xi2"><img src="http://www.oecr.com/uc_server/avatar.php?uid=29263&size=small" /></a> <span class="tit_author"> <a href="http://club.oecr.com/space-uid-29263.html">cooljay</a> </span> </div> <div class="date"><span>发布时间:</span> 2009-2-27 11:26</div> <div class="album_info"> <h3>正文摘要: </h3> <p> 当一LD的发散光经过准直镜的完全准直后，平行光进入CCD相机。在屏幕上看到的光斑光强并不如想象中的均匀（并不是只是否高斯分布），而是整个光斑的光强是由一块一块光强不一致的小光斑组成，看上去很离散的感觉。 ...</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_530313" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-52916.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=52916&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-52916.html" target="_blank" class="xi2">dublin</a><em id="author_530313"> 发表于</em> <span class="xg1 xw0">2009-3-7 09:00:02</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_530313"> 散斑是由激光的相干性决定的。要去散斑，最好用宽带光源，如SLED等。<br /> <br /> 图中还能看到衍射环，可能是准直器卡边造成的。</td></tr></table> </div> <div id="comment_530313" class="cm"> </div> <div id="post_rate_div_530313"></div> </div> </dd> </dl> </div> <div id="post_530056" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-35184.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=35184&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-35184.html" target="_blank" class="xi2">xull127</a><em id="author_530056"> 发表于</em> <span class="xg1 xw0">2009-3-6 12:29:05</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_530056"> <i class="pstatus"> 本帖最后由 xull127 于 2009-3-6 12:31 编辑 </i><br /> <br /> 本来就这样的啊。<br /> "衍射"+"干涉形成的散斑"</td></tr></table> </div> <div id="comment_530056" class="cm"> </div> <div id="post_rate_div_530056"></div> </div> </dd> </dl> </div> <div id="post_530054" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-35184.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=35184&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-35184.html" target="_blank" class="xi2">xull127</a><em id="author_530054"> 发表于</em> <span class="xg1 xw0">2009-3-6 12:27:25</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_530054"> <strong> <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=529968&ptid=83370" target="_blank">16#</a> <i>cooljay</i> </strong></td></tr></table> </div> <div id="comment_530054" class="cm"> </div> <div id="post_rate_div_530054"></div> </div> </dd> </dl> </div> <div id="post_529968" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-29263.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=29263&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-29263.html" target="_blank" class="xi2">cooljay</a><em id="author_529968"> 发表于</em> <span class="xg1 xw0">2009-3-6 10:08:25</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_529968"> 闪是不会闪的。后来我发现，即使不是用CCD成像，只要用肉眼仔细看，都看得到光斑是有一点点不均匀。那应该是光源的问题了。因为这种现象以前也发现，只是那个时候没有考虑到做视觉识别，所以没什么关系。现在在想办法用滤波的方法把这些不均匀的图像过滤掉就行了。光源是不能改的了，因为一改光源的话，设备的大小、成本和单色性都改动很大。</td></tr></table> </div> <div id="comment_529968" class="cm"> </div> <div id="post_rate_div_529968"></div> </div> </dd> </dl> </div> <div id="post_529806" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-51916.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=51916&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-51916.html" target="_blank" class="xi2">aaronzhou</a><em id="author_529806"> 发表于</em> <span class="xg1 xw0">2009-3-5 19:58:27</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_529806"> 你的光斑在CCD上闪不闪？</td></tr></table> </div> <div id="comment_529806" class="cm"> </div> <div id="post_rate_div_529806"></div> </div> </dd> </dl> </div> <div id="post_528806" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-63889.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=63889&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-63889.html" target="_blank" class="xi2">121331768</a><em id="author_528806"> 发表于</em> <span class="xg1 xw0">2009-3-3 12:16:58</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_528806"> 用普通光源加上干涉滤光片试一下可以吗？</td></tr></table> </div> <div id="comment_528806" class="cm"> </div> <div id="post_rate_div_528806"></div> </div> </dd> </dl> </div> <div id="post_528796" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-29263.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=29263&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-29263.html" target="_blank" class="xi2">cooljay</a><em id="author_528796"> 发表于</em> <span class="xg1 xw0">2009-3-3 11:31:43</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_528796"> 使用了高频调制降低激光的相干性也效果不大，难道真的要改光源？但我们这个实验对波长比较敏感，用其他光源比较复杂。请问大家有什么好的办法，谢谢！</td></tr></table> </div> <div id="comment_528796" class="cm"> </div> <div id="post_rate_div_528796"></div> </div> </dd> </dl> </div> <div id="post_528152" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-29263.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=29263&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-29263.html" target="_blank" class="xi2">cooljay</a><em id="author_528152"> 发表于</em> <span class="xg1 xw0">2009-3-1 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_528152"> <div class="quote"><blockquote>一般来说散斑是激光照射在漫反射屏上产生的漫反射光相干叠加的结果，还是属于激光的相干性这个范围。我看你这个图片很像做散斑实验的时候CCD接收到的画面，按说应该没这么大的反应，或许有其他原因吧。注意一下CCD表 ...<br /> <font size="2"><font color="#999999">optoboy 发表于 2009-2-28 22:49</font> <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=528093&ptid=83370" target="_blank"><img id="aimg_yJT21" 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 /> 并不是做散斑实验所得的，我试一下用高频调制把激光的相干性降低看效果如何。谢谢你的意见。<br /> PS：很久没听到散斑这个名词，所以第一次听以为是LD行业的一个独有名词。</td></tr></table> </div> <div id="comment_528152" class="cm"> </div> <div id="post_rate_div_528152"></div> </div> </dd> </dl> <script type="text/javascript" reload="1"> aimgcount[528152] = ['yJT21']; attachimggroup(528152); </script> </div> <div id="post_528093" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-53503.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=53503&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-53503.html" target="_blank" class="xi2">optoboy</a><em id="author_528093"> 发表于</em> <span class="xg1 xw0">2009-2-28 22:49:16</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_528093"> <i class="pstatus"> 本帖最后由 optoboy 于 2009-2-28 22:51 编辑 </i><br /> <br /> 一般来说散斑是激光照射在漫反射屏上产生的漫反射光相干叠加的结果，还是属于激光的相干性这个范围。我看你这个图片很像做散斑实验的时候CCD接收到的画面，按说应该没这么大的反应，或许有其他原因吧。注意一下CCD表面是否干净。</td></tr></table> </div> <div id="comment_528093" class="cm"> </div> <div id="post_rate_div_528093"></div> </div> </dd> </dl> </div> <div id="post_528022" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-29263.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=29263&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-29263.html" target="_blank" class="xi2">cooljay</a><em id="author_528022"> 发表于</em> <span class="xg1 xw0">2009-2-28 16:40:47</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_528022"> <strong> <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=527963&ptid=83370" target="_blank">9#</a> <i>optoboy</i> [/b<br /> 那请问散斑现象是否LD的共性？如果需要使成像光斑均匀，是否需要更改光源？因为我担心这种散班现象会影响后面的图像处理难度。</td></tr></table> </div> <div id="comment_528022" class="cm"> </div> <div id="post_rate_div_528022"></div> </div> </dd> </dl> </div> <div id="post_527963" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-53503.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=53503&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-53503.html" target="_blank" class="xi2">optoboy</a><em id="author_527963"> 发表于</em> <span class="xg1 xw0">2009-2-28 11:35:07</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_527963"> 图片上的黑白颗粒应该是激光散斑的影像，光强的不对称应该是你的激光准直和激光器之间不共心，存在倾斜的情况。</td></tr></table> </div> <div id="comment_527963" class="cm"> </div> <div id="post_rate_div_527963"></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 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