Sub-ppb level detection of nitrogen dioxide based on an optimized H-type longitudinal acoustic resonator and a lock-in white-light interferometry demodulation algorithm
Sub-ppb level detection of nitrogen dioxide based on an optimized H-type longitudinal acoustic resonator and a lock-in white-light interferometry demodulation algorithm
复制标题
基于优化的H型纵声谐振器和锁定白光干涉解调算法的亚ppb级二氧化氮检测
DOI：
10.1016/j.jqsrt.2020.107136
复制
发表时间：
2020-09-01
影响因子：
2.3
通讯作者：
Chen, Ke
中科院分区：
文献类型：
--
作者：
Gong, Zhenfeng;Gao, Tianli;Chen, Ke
介绍了一种用于二氧化氮(NO2)气体检测的优化H型纵向共振光声池。利用有限元方法和热粘性声学理论，对H型谐振放大腔的声场分布进行了计算，以优化H型谐振放大腔的结构。优化的H型谐振功率放大器与发射波长约为450 nm的高功率连续波(CW)多模激光二极管和光纤法布里-珀罗(F-P)声传感器一起构成了用于NO2检测的PAS系统。采用锁定白光干涉法(WLI)解调光纤声传感器的动态腔长。实验结果表明，在0-2ppm(百万分之几)的范围内，PA信号与NO2浓度成正比。测量灵敏度为0.652 nm/ppm，最低检测下限为1.26ppb(百万分之1)。(C)2020爱思唯尔有限公司。保留所有权利。
This paper presents an optimized H-type longitudinal resonant photoacoustic (PA) cell for nitrogen dioxide (NO2) gas detection. The PA field distributions of the H-type resonant PA cell have been evaluated to optimize the construction of the H-type resonant PA cell, using the finite element method and thermoviscous acoustic theory. The optimized H-type resonant PA cell, together with a high-power continuouswave (CW) multimode laser diode emitting at around similar to 450 nm and a fiber-optic Fabry-Perot (F-P) acoustic sensor, constitutes a PAS system for NO2 detection. The dynamic cavity length of the fiber-optic acoustic sensor is demodulated by the lock-in white-light interferometry (WLI) demodulation algorithm. Experimental results show that the PA signals are proportional to the concentrations of NO2 for the range of 0-2 ppm (parts per million). The sensitivity is measured to be 0.652 nm/ppm and the minimum detectable limit of NO2 is calculated to be 1.26 ppb (parts per billion). (C) 2020 Elsevier Ltd. All rights reserved.