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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=58" 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=114036&size=small" /></div> <h1 class="ph">NASA利用激光移动大型物体 </h1> <p class="xg1"> 时间：2011-11-3 16:40<a class="zz" href="home.php?mod=space&uid=114036">作者：duller</a> 阅读<em id="_viewnum">(1214)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=2583&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=58" 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>美国宇航局NASA正在进行科幻小说中描绘的“牵引光束”（Tractor Beam）的研究，这种牵引光束能利用激光移动大型物体，比如把火星漫游车拖到飞船轨道。</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">美国宇航局NASA正在进行科幻小说中描绘的“牵引光束”（Tractor Beam）的研究，这种牵引光束能利用<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a>移动大型物体，比如把火星漫游车拖到飞船轨道。<BR><BR>美剧《星际迷航记》（“Star Trek”）中，光束可以用来托运跨空间的太空仓，甚至网罗逃跑的敌人。现在不只是科学小说作家对“牵引光速”的想法感兴趣，NASA已经投资了10万美元的经费进行激光“拖拽”交通工具的研究，这些交通工具包括火星漫游车(Mars Rover)到轨道太空飞船。<BR><BR>据NASA透露，目前该项技术并“没有超越现有的技术。”NASA首席研究员Paul Stysley与其队友Demetrios Poulios、Barry Coyle已经在NASA戈达德太空飞行中心（Goddard Space Flight Center）进行了三种模型的实验，包括研究用光束来运输粒子、单分子、病毒、核糖核酸以及全功能细胞。<BR><BR>Stysley 表示：“虽然牵引光束是科幻小说中的主体，特别是在《星际迷航记》中，基于激光的拖拽并不是凭空想像或者有超越现在的技术”，“我们的初衷是使用牵引光束来清理太空轨道中的碎片”，“但拖拽如此巨大物体几乎是不可能，至少现在不能实现，但我们可以利用这一方法进行样品的采集”。<BR><BR>该小组将采用三种不同的方法对光传输技术进行研究，来确定最适合手机样本的技术。<BR><BR>第一种方法叫做光学旋涡或“光镊”，用两束反方向衍射光束产生的环形光波，把粒子限定在重叠光束的暗核心部分。经实验<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a><a href="http://display.oecr.com" target="_blank" class="relatedlink">显示</a>的结果，通过进行加强或削弱其中之一光束强度的交替，能形成被困粒子周围的空气被加热的效果，粒子就会沿着环中心移动。<BR><BR>另一种技术是“螺线”光束，它能给粒子一与光源相反方向的力，将粒子沿光束拉回，与第一种方法不同的是，这种技术只需要电磁效应，因此能在真空环境操作。<BR><BR>第三种方法涉及的是“贝塞尔光束”，即在光束所投射的中心点周围形成环形力量，<a href="http://theory.oecr.com" target="_blank" class="relatedlink">理论</a>上发射出去的光被电磁场向前方散射，由此可以目标物沿光束运动反方向拉回。<BR><BR>“现在我们要确保对这些方法有非常深入的了解，希望其中有一种方法能为达到最初目的起作用，” Coyle表示：“尽管我们还在起跑线上，但这还是一个新的挑战，一个尚未有人宣告成功的研究。”</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 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