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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: 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