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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=61" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">远心镜头基础知识 </h1> <p class="xg1"> 时间：2015-7-20 00:39<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1598)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=3530&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=61" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>远心镜头是一种高端的机器视觉镜头，其目的就是消除由于被测物体（或CCD芯片）离镜头距离的远近不一致，造成放大倍率不一样。分为：物方远心镜头、像方远心镜头和双侧远心镜头三大类。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><div>远心镜头是一种高端的机器视觉镜头，其目的就是消除由于被测物体（或CCD芯片）离镜头距离的远近不一致，造成放大倍率不一样。分为：物方远心镜头、像方远心镜头和双侧远心镜头三大类。</div><div><br></div><div><p><a href="data/attachment/portal/201507/20/003657wfhg70fo9lc0igmc.jpg" target="_blank"><img src="data/attachment/portal/201507/20/003657wfhg70fo9lc0igmc.jpg"></a></p></div><div><span style="line-height: 1.8em;">由于远心镜头具有独特的技术优势，目前，在<a href="http://machine.oecr.com" target="_blank" class="relatedlink">机械</a>零件<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>、塑料零件测量、玻璃制品与医药零件测量、<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>元件测量等高精度检测方面的需求，对于精密测量的场合特别适用。</span></div><div><span style="line-height: 1.8em;"><br></span></div><div><span style="line-height: 1.8em;">1、远心镜头优点</span></div><div>远心镜头的设计是采Telecentric原理，低失真、无视角误差，较适合工业上量测应用，所以价位较一般CCTV镜头高。远心镜头另有同轴镜头设计，提供不同工作距离,不同放大倍率供选择。</div><div><br></div><div>2、远心镜头低倍率镜头价格反而高</div><div>因为Telecentric镜头为了要减少失真，让平行光进入，所以镜头设计必须比被照体大，所以低倍率镜头通常口径都很大，所需的镜片<a href="http://material.oecr.com" target="_blank" class="relatedlink">材料</a>成本较高，所以价格较高。</div><div><br></div><div>3、用远心镜头所放大的影像到底是多少倍</div><div>影像实总际放大倍率是等于镜头光学倍率×Monitor放大倍率，Monitor放大倍率是Monitor对角线除上CCD Sensor对角线(1/3〞CCD Sensor投射到14吋Monitor是59.3倍)。</div><div><br></div><div>4、如果要看到1μm的物体用何种镜头</div><div>要看到小于1μm以下物体，必须用高倍显微物镜，但工作距离变得很小(约7㎜)，景深变得很浅了。</div><div><br></div><div>5、同轴光镜头打同轴光时，中间亮度较亮旁边整暗，是何原因？如何补救？</div><div>因为同轴光镜头的投射光线集中于中心5~6㎜左右，如果看的范围较大，边缘附近光线较暗，这是低倍率同轴光镜头常有的现象。可以外加环形光源来补足光线不够地方。</div><div><br></div><div>6、远心镜头可否搭配CCTV用的2倍镜使用？</div><div>可以，但是影像质量变差，所需光强度更强，不建议使用。</div><div><br></div><div>7、远心镜头规格上，标示镜头分解能(解析力)是代表什么意思？</div><div>镜头解析力的定义是镜头能看清楚最小物体边缘的能力，如果低于此分解能，就无法看清楚了。须另外找解析力更高的镜头，如高倍显微物镜。</div><div><br></div><div>8、远心镜头景深为何不能很长？</div><div>远心镜头设计时即考虑到景深、倍率、光圈、工作距离等参数取得最佳点，所以景深均为固定的数值，如要增长景深，而牺牲别的参数，会影响镜头质量。</div></td></tr></table> <!--[diy=diycontentbottom]--><div id="diycontentbottom" class="area"></div><!--[/diy]--> <script src="data/cache/home.js?eOg" type="text/javascript"></script> <div id="click_div"><table cellpadding="0" cellspacing="0" class="atd"> <tr><td> <a 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