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href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(98)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=9596&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=57" 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>关注！</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"><div> 近日，中科院合肥研究院安光所方勇华研究员团队在痕量气体光声检测研究方面取得新进展，相关研究成果发表在国际知名光学期刊OpticsExpress上，并被选为“Editor’sPick”文章（Editor'sPicksservetohighlightarticleswithexcellentscientificqualityandarerepresentativeoftheworktakingplaceinaspecificfield.）。博士生李振钢为论文第一作者。</div><div><br></div><div> 光声光谱是一种间接吸收光谱技术，通过检测气体吸收光能产生的光声信号来反演气体浓度，具有灵敏度高、选择性好、零背景检测等优点，广泛应用于环境监测、<a href="http://medicine.oecr.com" target="_blank" class="relatedlink">医疗</a>诊断、燃烧分析、电力检测等领域。然而，光声检测性能容易受到各类噪声的影响，如气体流动噪声和<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>学噪声等非相干噪声，以及光声池壁吸收光能产生的相干噪声等。在同时抑制相干与非相干噪声、增强光声信号方面鲜有报道。</div><div><br></div><div> 该团队基于光声检测原理，研制了一种新型的差分式亥姆霍兹光声池，其特殊结构使光束能够在镀金内壁上多次反射，以激发出更强的光声信号。同时，采用波长调制与二次谐波技术抑制了光声池壁因吸收光能产生的相干噪声。此外，由于该光声池的差分特性，使非相干噪声得到极大抑制。该光声池经过详细的仿真优化，在获得高检测性能参数的同时，进一步提高了待测气体的置换速度。在甲烷气体检测实验中，该光声<a href="http://sensor.oecr.com" target="_blank" class="relatedlink">传感</a>器表现出了良好的线性度和灵敏度。当激<a href="http://light.oecr.com" target="_blank" class="relatedlink">发光</a>源为较低功率（6mW）的近红外（1653nm）分布式反馈<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a>器时，在1s的检测时间内实现了甲烷气体177ppb的ZUI低检测限，对应的归一化噪声等效吸收系数为4.1×10–10cm–1WHZ–1/2（此前报道的归一化噪声等效吸收系数通常为10–8至10–10量级）。</div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/202209/15/090617npjnnzpf1f01u11c.png" target="_blank"><img src="data/attachment/portal/202209/15/090617npjnnzpf1f01u11c.png"></a></p><p 16px;="" 255,="" rgb(255,="" yahei",="" start;"="" normal;="" 14px;="" microsoft="" simsun;="" 255);"="" text-align:="" start;="" background-color:="" style="overflow-wrap: normal; margin: 0px; padding: 0px; color: rgb(143, 143, 143); font-family: Tahoma, "Microsoft Yahei", Simsun; background-color: rgb(255, 255, 255);"><font face="微软雅黑" style="overflow-wrap: normal;"><font color="#000000" style="overflow-wrap: normal;"> 免责声明：编写或转载此文是为了传递更多的信息，为光电行业尽一些绵薄之力。若文字或图片侵犯了您的合法权益或有不当之处，请作者在20个工作日之内与我们联系，我们将协调给予处理。</font></font></p><p 16px;="" 255,="" rgb(255,="" yahei",="" start;"="" normal;="" 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<dd>挺好，有希望了。</dd> </dl><a name="comment_anchor_32391"></a> <dl id="comment_32391_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(32391, '9596');">引用</a> </span> <a href="http://club.oecr.com/space-uid-37375.html" class="xi2 xw1" c="1">Qing46</a> <span class="xg1 xw0">2022-9-15 10:06</span> </dt> <dd>oecr我的最爱</dd> </dl><a name="comment_anchor_32390"></a> <dl id="comment_32390_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(32390, '9596');">引用</a> </span> <a href="http://club.oecr.com/space-uid-10397.html" class="xi2 xw1" c="1">博士新人</a> <span class="xg1 xw0">2022-9-15 10:06</span> </dt> <dd>我只是路过，不发表意见</dd> </dl><a name="comment_anchor_32389"></a> <dl id="comment_32389_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(32389, '9596');">引用</a> </span> <a href="http://club.oecr.com/space-uid-56975.html" class="xi2 xw1" c="1">ivanyu</a> <span class="xg1 xw0">2022-9-15 09:36</span> </dt> <dd>我喜欢望远镜。</dd> </dl><a name="comment_anchor_32388"></a> <dl id="comment_32388_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(32388, '9596');">引用</a> </span> <a href="http://club.oecr.com/space-uid-46595.html" class="xi2 xw1" c="1">龙吟凤</a> <span class="xg1 xw0">2022-9-15 09:06</span> </dt> <dd>产业发展真的太快了！！</dd> </dl></div> </div> <!--[diy=diycontentcomment]--><div id="diycontentcomment" class="area"></div><!--[/diy]--> </div> <div class="sd pph"> <div class="drag"> <!--[diy=diyrighttop]--><div id="diyrighttop" class="area"><div id="frameZRVHza" class="sy_ltdr frame move-span cl frame-1"><div class="frame-title title"><span class="titletext">社区成员推荐</span></div><div id="frameZRVHza_left" class="column frame-1-c"><div id="frameZRVHza_left_temp" class="move-span temp"></div><div 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