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高精度光声学二氧化气体分析仪用于快速动态测量

Hongchao Qi¹, Guangyin Zhang¹, Lin Xu¹

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

Analytical chemistry

|January 9, 2024

概括

一个新的光声学 (PA) 气体分析仪准确地实时测量环境二氧化 (NO2). 这种先进的仪器可显著降低噪音,以实现准确的环境监测.

科学领域:

环境科学环境科学
分析化学分析化学
光学工程是指光学工程.

背景情况:

准确和快速测量环境二氧化 (NO2) 对于环境监测和空气质量评估至关重要.
传统的气体分析仪经常面临降噪和响应时间的挑战,这限制了它们在动态条件下的有效性.
光声谱学 (PAS) 为气体检测提供了一种敏感的方法,但为了优化它适用于现实世界的应用,需要解决空气流噪声问题.

研究的目的:

开发一个高精度的光声学 (PA) 气体分析仪,以快速,动态地测量环境二氧化 (NO2).
通过最大限度地减少气流噪声和改善响应时间来提高PA分析器的性能.
通过不断监测和与已确定的环境数据进行比较来验证分析仪的可靠性和准确性.

主要方法:

开发了一种差异PA电池,与两个优化声器集成,以减轻空气流和引起的噪音.
使用450nm的高功率激光二极管 (LD) 来激发PA信号.
采用有限元法 (FEM) 来优化消音器参数,并控制在900平方米的环境空气吸入量,以减少和效应.

主要成果:

通过优化声器设计,实现了显著的95%气流噪声抑制.
对PA分析仪的快速响应时间为34秒.
对于NO2.2,已达到0.64ppb (1s整合) 和0.17ppb (15s整合) 的低检测极限.

结论:

开发的PA气体分析仪提供了环境NO2的高精度和快速动态测量能力.
集成的压声器系统有效地减少噪音,提高测量准确性和可靠性.
120小时的连续监测证实了分析仪的高可靠性,与国家环境监测数据相提并论.

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