物理学报2012，Vol.61Issue(12)：140-147,8.
基于石英音叉增强型光谱技术（QEPAS）的实时探测系统研究
Research on the real-time measurement system based on QEPAS
摘要
Abstract
A real-time measurement of gases based on QEPAS is introduced. For eliminating fluctuation of laser, a simple method, in which a digital PID algorithm and a software lock-in amplifier designed by using Lab-VIEW are employed, is utilized to lock the laser to the center of the absorption line. In order to test the system, an absorption line of water vapor near 1.396 ~m is chosen by using a fiber-coupled distributed feedback （DFB） diode laser. An over-40-hours continuous measurement is implemented, and the relevant results are presented and discussed. The detection limit of the system is 1 ppm. This method can also be used to measure the trace gases and monitor the industry gases.关键词
石英音叉增强型吸收光谱（QEPAS）/波长调制/软件数字锁相/数字PIDKey words
quartz enhanced photo-acoustic absorption spectroscopy (QEPAS)/wavelength modulation spec-troscopy (WMS)/software lock-in amplifier/digital PID分类
信息技术与安全科学引用本文复制引用
王贵师,易红明,蔡廷栋,汪磊,谈图,张为俊,高晓明..基于石英音叉增强型光谱技术（QEPAS）的实时探测系统研究[J].物理学报,2012,61(12):140-147,8.基金项目
国家高技术研究发展计划（批准号：2009AA062204）和中国科学院重大科研装备研制项目（批准号：YZ200818）资助的课题. （）
