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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=62" 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">菲涅耳透镜的工作原理 </h1> <p class="xg1"> 时间：2011-9-22 09:57<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(2754)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=2438&idtype=aid" title="查看全部评论"><em id="_commentnum">1</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=62" 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>看过放大透镜的人都知道它的中间很厚，越到边缘越薄。它的形状很像一颗小扁豆，这也是单词“lens”的来历。（“扁豆”的英文“lentil”与“透镜”的英文“lens”相似。）</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">看过放大透镜的人都知道它的中间很厚，越到边缘越薄。它的形状很像一颗小扁豆，这也是单词“lens”的来历。（“扁豆”的英文“lentil”与“透镜”的英文“lens”相似。）要为您的RV（一种旅行车）制作一面大的放大透镜并不是很容易，因为它很厚、很重而且不便安装。<br><br>菲涅耳透镜是根据它的发明者，法国<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>学家奥古斯丁·简·菲涅耳命名的。菲涅耳曾在19世纪研究过光和光学。点击此处了解更多信息。<br> <br>您正在使用的塑料薄片称为菲涅耳透镜。它的一面是平坦的，另一面是凸起的。人们首次使用菲涅耳透镜是在18世纪初，当时它被用在灯塔的探照灯上，聚焦射出来的光束。当人们需要一面又薄又轻的透镜时，塑料菲涅耳透镜便派上了用场。尽管成像质量不如玻璃透镜，但是在很多应用中（就像您的RV）我们并不需要完美的图像质量。<br> <br>菲涅耳透镜背后的基本思想很简单。想象一下，取一面塑料放大镜并将其切成一百个同心圆环（就像树的年轮）薄片。每个圆环都比旁边的圆环稍微小一点，并将光会聚到中心。现在，取出并修改每一个圆环，使其一边平坦并且与其余圆环等厚。为了保持圆环向中心会聚光线的能力，各个圆环的斜面的角度将有所不同。现在，若将所有圆环堆叠在一起，您就可以得到一面菲涅尔透镜了。如果您愿意，可以将透镜做得特别大。大型菲涅尔透镜经常用作<a href="http://solar.oecr.com" target="_blank" class="relatedlink">太阳能</a>聚光器。 <div><font color="#808080" size="2"><img src="http://www.oecr.com/xwb/images/bgimg/icon_logo.png"> 已同步至 <a href="http://ome.ac.cn/index.php?m=show&id=3360363854424368" target="_blank">update的微博</a></font></div></td></tr></table> <!--[diy=diycontentbottom]--><div id="diycontentbottom" class="area"></div><!--[/diy]--> <script src="data/cache/home.js?E5r" type="text/javascript"></script> <div id="click_div"><table cellpadding="0" cellspacing="0" class="atd"> <tr><td> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=click&op=add&clickid=1&idtype=aid&id=2438&hash=16dd4c0de2245472c8273f41f0fc57e4&handlekey=clickhandle" id="click_aid_2438_1" onclick="showWindow(this.id, this.href);doane(event);"> <img 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