Study on Mash Gas Monitoring with Distributed Multipoint Fiber Optic Sensors System in Coal Mine

Author

He, Ying ; Zhang, Yujun ; Kan, Ruifeng ; Wang, Liming ; You, Kun ; Liu, Jianguo

Author_Institution

Key Lab. of Environ. Opt. & Technol., Anhui Inst. of Opt. & Fine Mech., Hefei, China

fYear

2012

fDate

21-23 May 2012

Firstpage

1

Lastpage

4

Abstract

Fast, accurate, real-time measurement of gas concentration is an important task for preventing the coal mining disaster. Combining tunable diode laser absorption spectroscopy (TDLAS) technique with distributed fiber sensing technique, a multipoint fiber optic sensors system for gas monitoring is designed. The wavelength modulation technique and harmonic detection techniques are used to obtain the necessary sensitivity. Simulating experiment is carried out, and the influence of the laser intensity fluctuation for measurement is eliminated by I_2f/I₀. The detective limit of the system is below 0.05%, the time resolution is 1s. The system offers a simple, intrinsically safe design with fiber optic sensors head, and carries out real-time, fast, continuous and non-intrusive measurement which meets the requirements of coal mining gas monitoring.

Keywords

accident prevention; chemical variables measurement; coal; condition monitoring; design engineering; distributed sensors; fibre optic sensors; gas sensors; measurement by laser beam; mining; occupational safety; optical modulation; semiconductor lasers; TDLAS technique; coal mine; coal mining disaster prevention; continuous measurement; design safety; distributed fiber sensing technique; distributed multipoint fiber optic sensors system; harmonic detection techniques; laser intensity fluctuation elimination; mash gas monitoring; nonintrusive measurement; real-time gas concentration measurement; system detective limit; system time resolution; tunable diode laser absorption spectroscopy; wavelength modulation technique; Absorption; Fiber lasers; Gas lasers; Measurement by laser beam; Monitoring; Optical fiber sensors; Optical fibers;

fLanguage

English

Publisher

ieee

Conference_Titel

Photonics and Optoelectronics (SOPO), 2012 Symposium on

Conference_Location

Shanghai

ISSN

2156-8464

Print_ISBN

978-1-4577-0909-8

Type

conf

DOI

10.1109/SOPO.2012.6270480

Filename

6270480