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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">天文望远镜的分辨率 让我看清你的脸 </h1> <p class="xg1"> 时间：2016-8-16 09:51<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(2127)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=4725&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=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>想买台天文望远镜观测美丽的星空吗？怎么样选择一台好的天文望远镜？集光本领是不是越强越好？放大倍数是不是越大越好？集光本领，放大倍数并不能表达望远镜的质量，望远镜质地取决于它的分辨本领，即分开两颗很相近 ...</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"><p style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);">想买台天文望远镜观测美丽的星空吗？怎么样选择一台好的天文望远镜？集光本领是不是越强越好？放大倍数是不是越大越好？集光本领，放大倍数并不能表达望远镜的质量，望远镜质地取决于它的分辨本领，即分开两颗很相近的双星的最高能力。望远镜的分辨率越高，越能观测到更暗、更多的天体，看到的像也越清楚。所以说，高分辨率是望远镜最重要的性能指标之一。分辨率高，星像清晰的望远镜会远比只是集光力强的大口径望远镜实用得多。天文观察要求光学质量最高，若大口径镜只看见模糊的星像，用处就不大。</p><p style="text-align: center;"><a href="data/attachment/portal/201608/16/094623xk6hod2he60heh2c.jpg" target="_blank"><img src="data/attachment/portal/201608/16/094623xk6hod2he60heh2c.jpg"></a><span style="color: rgb(107, 107, 107); font-family: 微软雅黑; font-size: 16px; line-height: 28px; text-indent: 2em; background-color: rgb(255, 255, 255);"> </span></p><p style="text-align: center;"><a href="data/attachment/portal/201608/16/094601wuj9c9djpwzdwj0z.jpg" target="_blank"><img src="data/attachment/portal/201608/16/094601wuj9c9djpwzdwj0z.jpg"></a><span style="color: rgb(107, 107, 107); font-family: 微软雅黑; font-size: 16px; line-height: 28px; text-indent: 2em; background-color: rgb(255, 255, 255);"> </span></p><p align="center" style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);"> </p><p align="center" style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);"><img id="{855B0F6E-2A33-4F42-A1BC-4530F1395A85}" title="" border="0" align="center" src="http://news.xinhuanet.com/science/2016-06/16/135438574_14659588557871n.png" sourcedescription="编辑提供的本地文件" sourcename="本地文件" style="box-sizing: border-box; border: none; vertical-align: middle; margin: 0px; padding: 0px; outline: none; list-style: none; width: 237px; height: 159px;"></p><p style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);"></p><p align="center" style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; text-align: center; background-color: rgb(255, 255, 255);">图1 普通分辨率图片（来自网络）</p><p style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);"></p><p align="center" style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);"> </p><p align="center" style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);"><img id="{89034C67-F9F8-45C6-B125-FD58CA030AFA}" title="" border="0" align="center" src="http://news.xinhuanet.com/science/2016-06/16/135438574_14659589252871n.png" sourcedescription="编辑提供的本地文件" sourcename="本地文件" style="box-sizing: border-box; border: none; vertical-align: middle; margin: 0px; padding: 0px; outline: none; list-style: none; width: 238px; height: 155px;"></p><p align="center" style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; text-align: center; background-color: rgb(255, 255, 255);">图2 高分辨率图片（来自网络）</p><p align="center" style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; text-align: center; background-color: rgb(255, 255, 255);"> </p><p style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);"></p><p style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);"></p><p style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);"></p><p align="center" style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);"><img id="{983596CF-6E14-4DE9-9ABC-DBC68EDE6DD4}" title="" border="0" align="center" src="http://news.xinhuanet.com/science/2016-06/16/135438574_14659589415791n.png" sourcedescription="编辑提供的本地文件" sourcename="本地文件" style="box-sizing: border-box; border: none; vertical-align: middle; margin: 0px; padding: 0px; outline: none; list-style: none; width: 373px; height: 225px;"></p><p align="center" style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; text-align: center; background-color: rgb(255, 255, 255);">图3 分辨率与分辨角关系图（来自网络）</p><p align="center" style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; text-align: center; background-color: rgb(255, 255, 255);"> </p><p style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);"></p><p style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);">那么什么是分辨率呢？分辨率是刚好能把两个点区分开的最短距离。是一架望远镜<a href="http://theory.oecr.com" target="_blank" class="relatedlink">理论</a>上让你看到细节的优良程度。你能看到多小的物体，或者说两个物体靠的多近时仍然可以被分辨。望远镜的分辨率是以角秒来衡量的。望远镜的分辨率大小以极限分辨角来表征。分辨角越小，分辨率越好。</p><p style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);">分辨率与那些因素有关呢？为什么天文学家总希望得到最好的分辨率的天文望远镜呢？分辨率主要和口径有关。根据<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>光学理论望远镜的物镜口径越大，分辨力越好。一架以角秒衡量的光学望远镜的理论分辨率可以很容易的以13除以这架望远镜的以厘米衡量的主镜的口径来计算。例如，这样一架100英寸（2.54厘米等于一英寸，100英寸等于254厘米）的望远镜理论分辨率约为0.05（13/254cm）角秒。一架200英寸望远镜理论分辨率约为0.025（13/2*254cm)角秒（只有满月直径的1/36000）。换句话说，第二架望远镜可以分辨只有0.025角秒的天空中的两颗星。而100英寸的望远镜只能把它们看成一颗星。这是天文学家垂涎尽可能大的望远镜口径的原因。但是在实际的观察中由于大气宁静度与望远镜系统像差等的影响,望远镜的实际分辨角要远比理论分辨角大（较好的望远镜也只能介于0.5到2角秒之间）。</p><p align="center" style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; outline: none; list-style: none; font-family: 微软雅黑; font-size: 16px; color: rgb(107, 107, 107); text-indent: 2em; line-height: 28px; background-color: rgb(255, 255, 255);"><a href="data/attachment/portal/201608/16/094605fdyodowzbqwqktwn.jpg" target="_blank" style="font-family: Tahoma, Arial, Helvetica, snas-serif; font-size: 14px; line-height: 1.8em;"><img src="data/attachment/portal/201608/16/094605fdyodowzbqwqktwn.jpg"></a> </p><p class="MsoNormal" align="left" style="text-align: center;"><span 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href="http://club.oecr.com/space-uid-96603.html" class="xi2 xw1" c="1">秀彧城</a> <span class="xg1 xw0">2016-8-16 16:51</span> </dt> <dd>学习下新知识。</dd> </dl><a name="comment_anchor_7793"></a> <dl id="comment_7793_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(7793, '4725');">引用</a> </span> <a href="http://club.oecr.com/space-uid-57904.html" class="xi2 xw1" c="1">lijiuqi</a> <span class="xg1 xw0">2016-8-16 12:21</span> </dt> <dd>路过</dd> </dl><a name="comment_anchor_7790"></a> <dl id="comment_7790_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(7790, '4725');">引用</a> </span> <a href="http://club.oecr.com/space-uid-120913.html" class="xi2 xw1" c="1">phywolf</a> <span class="xg1 xw0">2016-8-16 10:51</span> </dt> <dd>不错，管理员多宣传这里啊。</dd> </dl><a name="comment_anchor_7788"></a> <dl id="comment_7788_li" class="ptm pbm bbda cl"> <dt class="mbm"> 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