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差分吊杆增强光纤光声传感器用于扩散气体检测

Chenxi Li¹, Yajie Zhang¹, Min Guo²

¹School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian, Liaoning 116024, China.

Analytical chemistry

|March 7, 2024

概括

一种新的差分悬臂光纤光声传感器通过抑制噪音来增强气体检测. 这种改进的传感器显示了80%的环境噪声干扰减少,使敏感的乙检测.

科学领域:

光学和光子学在光学和光子学.
传感器技术传感器技术
频谱学是一种光谱学.

背景情况:

光纤光声学 (PA) 传感器易受外部振动和噪声的影响,这限制了它们在扩散气体检测中的应用.
现有的PA传感器经常与环境干扰作斗争,需要改进设计以获得强大的性能.

研究的目的:

为扩散气体检测提出和验证一个差异悬臂增强光纤PA传感器.
为了提高传感器抑制外部干扰的能力,如振动和电磁干扰.
为了达到像乙 (C2H2) 这样的气体的较低检测极限.

主要方法:

采用了两个对称分布的PA管的差分结构,一个作为信号通道,另一个作为参考通道.
差异干扰计支架被用来检测来自两个通道的叠加的PA和干扰信号.
一个单一的白光干涉计解调器被用于通过多重化光谱频域来同时恢复信号.

主要成果:

与传统的单杆传感器相比,差分支架增强的PA传感器在环境噪声抑制方面取得了80%的改进.
外部同频干扰被抑制了20.9dB.
对乙 (C2H2) 的最低检测极限约为60ppb,其整合时间为100秒.

结论:

拟议的差异悬臂增强光纤PA传感器有效抑制外部干扰和噪音.
该传感器具有出色的抗振动和电磁干扰能力.
这项技术为在具有挑战性的环境中灵敏可靠的扩散气体检测提供了有前途的解决方案.

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