Research on the real-time measurement system based on QEPAS

被引：4

作者：

Wang Gui-Shi ^{[1
]}

Yi Hong-Ming ^{[1
]}

Cai Ting-Dong ^{[1
]}

Wang Lei ^{[1
]}

Tan Tu ^{[1
]}

Zhang Wei-Jun ^{[1
]}

Gao Xiao-Ming ^{[1
]}

机构：

[1] Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Lab Environm Spect, Hefei 230031, Peoples R China

来源：

ACTA PHYSICA SINICA | 2012年 / 61卷 / 12期

基金：

国家高技术研究发展计划(863计划);

关键词：

quartz enhanced photo-acoustic absorption spectroscopy (QEPAS); wavelength modulation spectroscopy (WMS); software lock-in amplifier; digital PID; ENHANCED PHOTOACOUSTIC-SPECTROSCOPY; TRACE-GAS SENSOR; AMMONIA DETECTION; QUARTZ; METHANE;

D O I：

10.7498/aps.61.120701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 mu 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 I ppm. This method can also be used to measure the trace gases and monitor the industry gases.

引用

页数：8

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