Gas Sensing System Based on Correlation Spectroscopy and Differential Technology

doi:10.12068/j.issn.1005-3026.2015.04.002

Journal of Northeastern University Natural Science ›› 2015, Vol. 36 ›› Issue (4): 461-464.DOI: 10.12068/j.issn.1005-3026.2015.04.002

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Gas Sensing System Based on Correlation Spectroscopy and Differential Technology

ZHANG Ya-nan， ZHAO Yong， WANG Qi， HU Hai-feng

School of Information Science & Engineering， Northeastern University， Shenyang 110819， China.

Received:2014-04-23 Revised:2014-04-23 Online:2015-04-15 Published:2014-11-07
Contact: ZHAO Yong
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Abstract

Abstract: Based on correlation spectroscopy and differential technology， a novel optical fiber gas sensing system was designed to realize high-sensitive， high-precision and real-time online detection of the trace gas. The theoretical basic of the system was analyzed in detail， and then appropriate devices for the sensing system were selected. Based on this， an optical fiber gas sensing system was constructed to measure the volume fraction of acetylene gas. The proposed system could not only eliminate the disturbances of light-intensity fluctuation and the contaminating gas in the measuring gas， but also avoid the influence of noise and ambient light in the surrounding environment. The experimental results showed that the system resolution could reach 0.5‰， the measurement sensitivity was 6.62μV， the maximum absolue error was 0.15‰， the relative error was 7.5%， the system stability was 2.27%， and the system repeatability error was 0.817%.

Key words: gas sensing, correlation spectroscopy, differential technology, concentration measurement, acetylene gas

CLC Number:

TP212.2

ZHANG Ya-nan， ZHAO Yong， WANG Qi， HU Hai-feng. Gas Sensing System Based on Correlation Spectroscopy and Differential Technology[J]. Journal of Northeastern University Natural Science, 2015, 36(4): 461-464.

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Gas Sensing System Based on Correlation Spectroscopy and Differential Technology

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