Research on the real-time measurement system based on QEPAS | Zendy

Guishi Wang | Zendy; Yi Hongming | Zendy; Tingdong Cai | Zendy; Lei Wang | Zendy; Tu Tan | Zendy; Zhang Weijun | Zendy; Xiaoming Gao | Zendy

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Research on the real-time measurement system based on QEPAS

Author(s) -

Guishi Wang,

Yi Hongming,

Tingdong Cai,

Lei Wang,

Tu Tan,

Zhang Weijun,

Xiaoming Gao

Publication year - 2012

Publication title -

acta physica sinica

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.199

H-Index - 47

ISSN - 1000-3290

DOI - 10.7498/aps.61.120701

Subject(s) - computer science , laser , tunable diode laser absorption spectroscopy , diode , software , lock in amplifier , amplifier , measure (data warehouse) , time delay and integration , optics , materials science , distributed feedback laser , optoelectronics , physics , telecommunications , bandwidth (computing) , database , computer vision , programming language

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.

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