红外与毫米波学报2018，Vol.37Issue(2)：173-176,4.DOI:10.11972/j.issn.1001-9014.2018.02.008
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
摘要
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-wave-length 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 dem-onstrate 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.关键词
光声光谱/双波长法/电流调制Key words
photoacoustic spectroscopy/dual-wavelength schema/current modulation分类
数理科学引用本文复制引用
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):173-176,4.基金项目
Supported by National Natural Science Foundation of China(NSFC 61307099),the Fundamental Research Funds for Central Universities(WUT 2016-IA-009) （NSFC 61307099）
