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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=54876&size=small" /></div> <h1 class="ph">激光原子钟有望成为新国际计时标准 </h1> <p class="xg1"> 时间：2013-7-31 16:46<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1480)</em> 评论: 0</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>关于重新定义“秒”的战争还远远不会结束，美国国家标准与技术研究院的物理学家们也正在研发铝离子时钟，旨在将 37 亿年的时间误差精确到一秒之内，遗憾的是，这种铝离子时钟不够稳定，故难以广泛使用。</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>国外一组以 Jerome Lodewyck 科学家为首的巴黎天文台<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>学家已经成功使用<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a>原子钟将 3 亿年的时间差精确到一秒之内，拥有这种精确度的原子时钟可以重新定义“秒”，可角逐新一代国际标准原子钟的地位，希望能成为新的全球计时标准。<BR>原子时钟只要是应用微波来振动铯原子，现在的国际单位制就是使用这种时钟来定义“秒”。虽然微波辐射的频率达到了 10GHz，但新原子钟在激光束的帮助下，它的频率更高，<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>时间的精确度是其他时钟的 3 倍。物理学家们用两个激光原子钟来测量时间，发现它们没有误差，且完美同步。</P> <P><A href="http://www.oecr.com/data/attachment/portal/201307/31/1646296x0d0x3ibhx226x4.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201307/31/1646296x0d0x3ibhx226x4.jpg"></A></P> <P>巴黎天文台物理学家的研究<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>能够证明激光原子钟的准确性和稳定性，对未来的大型<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">精密仪器</a>制造很有帮助。<BR><BR>关于重新定义“秒”的战争还远远不会结束，美国国家标准与技术研究院的物理学家们也正在研发铝离子时钟，旨在将 37 亿年的时间误差精确到一秒之内，遗憾的是，这种铝离子时钟不够稳定，故难以广泛使用。<BR><BR></P> <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://api.t.sina.com.cn/2200118572/statuses/3606168767740878" 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?eOg" type="text/javascript"></script> <div id="click_div"><table cellpadding="0" cellspacing="0" class="atd"> <tr><td> <a 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