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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=84100" 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=84100&hash=e4407e09" 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=84100&hash=e4407e09" 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-70154.html" target="_blank" class="xi2"><img src="http://www.oecr.com/uc_server/avatar.php?uid=70154&size=small" /></a> <span class="tit_author"> <a href="http://club.oecr.com/space-uid-70154.html">tan414</a> </span> </div> <div class="date"><span>发布时间:</span> 2009-3-12 21:13</div> <div class="album_info"> <h3>正文摘要: </h3> <p>请教：基尔霍夫衍射 , 当z与x的量级相近，泰勒展开后高阶项无法忽略时，有何方法可对光程做近似处理？</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_533195" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-84666.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=84666&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-84666.html" target="_blank" class="xi2">uuuhjh2005</a><em id="author_533195"> 发表于</em> <span class="xg1 xw0">2009-3-16 11:14:26</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_533195"> 都是高手啊<br /> 俺来就是听听，呵呵</td></tr></table> </div> <div id="comment_533195" class="cm"> </div> <div id="post_rate_div_533195"></div> </div> </dd> </dl> </div> <div id="post_532764" 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_532764"> 发表于</em> <span class="xg1 xw0">2009-3-14 11:38:34</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_532764"> 不好意思，脑子犯了下糊涂，搞错了。<br /> <br /> 近场比远场费劲。如果是准远场，还可以转缓一下，用FFT。深近场好像只有硬算了。不过也就慢一点，还没到解决部了的程度。</td></tr></table> </div> <div id="comment_532764" class="cm"> </div> <div id="post_rate_div_532764"></div> </div> </dd> </dl> </div> <div id="post_532747" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-82458.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=82458&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-82458.html" target="_blank" class="xi2">codevnewer</a><em id="author_532747"> 发表于</em> <span class="xg1 xw0">2009-3-14 10:02:48</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_532747"> 楼上正解。。。。。。。。。。。。。。。。。。。。。</td></tr></table> </div> <div id="comment_532747" class="cm"> </div> <div id="post_rate_div_532747"></div> </div> </dd> </dl> </div> <div id="post_532536" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-70154.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=70154&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-70154.html" target="_blank" class="xi2">tan414</a><em id="author_532536"> 发表于</em> <span class="xg1 xw0">2009-3-13 18:40:51</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_532536"> 远场衍射是夫琅禾费吧,基尔霍夫衍射公式是建立在惠更斯-菲涅尔原理,和亥姆霍兹方程之上的,除近场情况( z<1个光波长）没学过不清楚外，其他情况下，包括z与x的量级相近时（远大于um量级）时还是用,基尔霍夫衍射公式解阿</td></tr></table> </div> <div id="comment_532536" class="cm"> </div> <div id="post_rate_div_532536"></div> </div> </dd> </dl> </div> <div id="post_532328" 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_532328"> 发表于</em> <span class="xg1 xw0">2009-3-13 10:46:52</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_532328"> 基尔霍夫衍射是远场衍射，条件是z>>>>x. 当z与x的量级相近时, 此公式使用条件不成立</td></tr></table> </div> <div id="comment_532328" class="cm"> </div> <div id="post_rate_div_532328"></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 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