A Gas Detection System Based on the Micro Light Splitting Principle

Author:

Wang Hai Rong1,Zhang Wei2,Cen Di3,Tian Min4

Affiliation:

1. Xi'an Jiaotong University

2. Mechanical Engineering School, Xi’an Jiaotong University, Xi’an

3. Xi’an Jiaotong University

4. Environmental Security Center, Measurement Science Research Institute, Xi’an

Abstract

This paper presents a novel system for detecting concentration of the CH4 and CO gases, which exist widely in the coal industry. The system applies micro blazed grating to split the collimated light and may get the infrared absorption light with certain wavelength and bandwidth for the gases detection. The schematic diagram, calculation, signal processing, and setup were described in details. Experimental results indicate that the detection system has the ability to detect methane and carbon monoxide with maximum error of 0.169% and 58.3ppm, stability of 0.76% and 0.22%, respectively.

Publisher

Trans Tech Publications, Ltd.

Subject

General Engineering

Reference11 articles.

1. Wang H R, Gao X N, Sun G L, Cen D and Jiang Z D, Micro polymer micro-blazed grating fabricated by HEL and its application on sensing methane concentration J. ISTM. Vol. 6(2009) 2957-2960.

2. Xiong Y H and Jiang T Y, NDIR Gas Sensors Based on Pulsable IR Source J. Chinese Journal of Scientific Instrument. Vol. 11(2003) 4-9.

3. Shi J F, Hui M, Wang D S and Mao W W, Micromation and applications of spectrometers J. Optical Technique. Vol. 29(2003) 13-20.

4. Ju H and Wu Y H Development of micro spectrometers J. MEMS Device and Technology. (2003) 30-37.

5. T Otto, R Saupe, A Weiss, V Stock, O Throl, W Grahlert, S Kaskel, H Schreck and T Gessner, MEMS analyzer for fast determination of mixed gas. Proceedings of MOEMS. (2009) 72080E.

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