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href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(43)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=9714&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a>来自: 网络平台</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>光学系统中用一些中心开孔的薄金属片来合理限制成像光束的宽度、位置和成像范围。这些限制成像光束和成像范围的薄金属片称为光阑。</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> 光学系统中用一些中心开孔的薄金属片来合理限制成像光束的宽度、位置和成像范围。这些限制成像光束和成像范围的薄金属片称为光阑。</div><div><br></div><div style="text-align: center;"> <a href="data/attachment/portal/202303/15/083452nd3duvwx8za7vyax.png" target="_blank"><img src="data/attachment/portal/202303/15/083452nd3duvwx8za7vyax.png"></a></div><div><br></div><div> 光阑对光束加以限制，对系统的几何光学和<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>光学性质将产生重大影响。表现为：</div><div><br></div><div> 1、影响光学系统（不考虑衍射效应）的几何像差，即影响自光学系统出射的光束结构。</div><div><br></div><div> 2、影响由于光的波动性所决定的衍射性质，这种衍射性质即使在没有像差时也将使点的像发生畸变。</div><div><br></div><div> 3、由于光阑决定光束截面，因而决定了能通过光学系统的光能量，也就决定了光学系统在屏、接受元件(如底片、CCD等)或人眼的网膜上所产生的照度。</div><div><br></div><div> 4、影响与入射光束孔径有关的成像空间深度（即景深）与分辨本领。</div><div><br></div><div><section microsoft="" yahei",="" simsun;="" margin:="" 0px;="" padding:="" background-color:="" rgb(255,="" 255,="" 255);"="" 255);="" overflow-wrap:="" normal;"="" style="word-wrap: normal; color: rgb(143, 143, 143); font-family: Tahoma, "Microsoft Yahei", Simsun; background-color: rgb(255, 255, 255);"><p style="word-wrap: normal; margin: 0px; padding: 0px 0px 1em; overflow-wrap: 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