红外与毫米波学报, 2018, 37 (2): 173, 网络出版: 2018-05-29  

基于双波长法的光声光谱气体检测

A dual-wavelength interrogation schema for trace gas photoacoustic spectroscopy
作者单位
1 武汉理工大学 理学院物理系,湖北 武汉 430070
2 武汉精昱光电科技有限公司,湖北 武汉 430070
摘要
光声光谱法是检测气体最灵敏的方法,气体浓度检测精度可达到ppt量级,但这需要复杂的实验系统和昂贵的器材,不利于在工程实践上使用.本文基于可调激光器的电流调制特性,提出了一种在测量气体吸收谱的吸收零点和吸收峰之间有效切换波长的简单调制方法.当激光功率为2.1 mW时,甲烷气体浓度的测量极限可达到0.46 ppm,测量结果证明了双波长法的可行性.
Abstract
Photoacoustic spectroscopy is the most sensitive approach of trace gas analysis reaching part per trillion by volume level and available for engineering practice, but not sufficiently satisfy the measurement demand of gases with weak absorption in near infrared zone. This paper presents a simple interrogation method using a dual-wavelength schema to switch effectively between the absorption and unabsorption lines of the gas to be measured, which takes good advantage of the current modulation characteristic of laser diode. Measurement results of methane demonstrate the feasibility and a relatively simple way to reach resolution of 0.46 ppm of the dual-wavelength method when the laser power is 2.1 mW.
参考文献

[1] Martin P A. Near-infrared diode laser spectroscopy in chemical process and environmental air monitoring[J]. Chemical Society Reviews, 2002, 31(4):201-10.

[2] Schilt S, Thévenaz L, Niklès M, et al. Ammonia monitoring at trace level using photoacoustic spectroscopy in industrial and environmental applications[J]. Spectrochimica Acta Part A Molecular & Biomolecular Spectroscopy, 2004, 60(14):3259.

[3] Yin X K, Dong L, Wu H P,et al. Sub-ppb nitrogen dioxide detection with a large linear dynamic range by use of a differential photoacoustic cell and a 3.5 W blue multimode diode laser[J]. Sensors and Actuators B: Chemical, 2017, 247:329-335.

[4] Yi H, Liu K, Chen W, et al. Application of a broadband blue laser diode to trace NO2 detection using off-beam quartz-enhanced photoacoustic spectroscopy[J]. Optics Letters, 2011, 36(4):481.

[5] Yi H, Chen W, Vicet A, et al. T-shape microresonator-based quartz-enhanced photoacoustic spectroscopy for ambient methane monitoring using 3.38-μm antimonide-distributed feedback laser diode[J]. Applied Physics B, 2014, 116(2):423-428.

[6] Koskinen V, Fonsen J, Roth K, et al. Progress in cantilever enhanced photoacoustic spectroscopy[J]. Vibrational Spectroscopy, 2008, 48(1):16-21.

[7] Gondal M A, Dastageer A, Shwehdi M H. Photoacoustic spectrometry for trace gas analysis and leak detection using different cell geometries[J]. Talanta, 2004, 62(1):131-14.

[8] Starecki T, Geras A. Improved open photoacoustic Helmholtz cell[J]. International Journal of Thermophysics, 2014, 35(11):2023-2031.

[9] Li J, Chen C, Zheng C, et al. Extraction of physical parameters from photoacoustic spectroscopy using wavelet transform[J]. Journal of Applied Physics, 2011, 109(6):041101-469.

[10] Li Y, Yang B J, Yuan Y, et al. Analysis of a kind of Duffing oscillator system used to detect weak signals[J]. Chinese Physics B, 2007, 16(4):1072-1076.

季焱, 易迎彦, 黎敏, 吕海飞, 文晓艳, 李玉林. 基于双波长法的光声光谱气体检测[J]. 红外与毫米波学报, 2018, 37(2): 173. JI Yan, YI Ying-Yan, LI Min, LU Hai-Fei, WEN Xiao-Yan, LI Yu-Lin. A dual-wavelength interrogation schema for trace gas photoacoustic spectroscopy[J]. Journal of Infrared and Millimeter Waves, 2018, 37(2): 173.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!