(英)基于双波长法的光声光谱气体检测
投稿时间:2017-09-29  修订日期:2017-11-09  点此下载全文
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作者单位E-mail
季焱 武汉理工大学 15370932898@163.com 
易迎彦 武汉理工大学 yiyingyan@163.net 
黎敏 武汉理工大学 minli@whut.edu.cn 
吕海飞 武汉理工大学 haifeilv@whut.edu.cn 
文晓艳 武汉理工大学 26988489@qq.com 
基金项目:国家重点基础研究发展计划(973计划)
中文摘要: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的推广。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2.1mW时,甲烷气体浓度的测量极限可达到0.46ppm,测量结果证明了双波长法的可行性。
中文关键词:双波长法、光声光谱、电流调制
 
A dual-wavelength interrogation schema for trace gas photoacoustic spectroscopy
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 2.1mW.
keywords:dual-wavelength schema  photoacoustic spectroscopy  current modulation
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