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Sensors 2016, 16(8), 1187; doi:10.3390/s16081187

A Robust Distributed Multipoint Fiber Optic Gas Sensor System Based on AGC Amplifier Structure

School of Physics and Technology, University of Jinan, Jinan 250022, China
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 12 June 2016 / Revised: 17 July 2016 / Accepted: 21 July 2016 / Published: 28 July 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [3677 KB, uploaded 28 July 2016]   |  

Abstract

A harsh environment-oriented distributed multipoint fiber optic gas sensor system realized by automatic gain control (AGC) technology is proposed. To improve the photoelectric signal reliability, the electronic variable gain can be modified in real time by an AGC closed-loop feedback structure to compensate for optical transmission loss which is caused by the fiber bend loss or other reasons. The deviation of the system based on AGC structure is below 4.02% when photoelectric signal decays due to fiber bending loss for bending radius of 5 mm, which is 20 times lower than the ordinary differential system. In addition, the AGC circuit with the same electric parameters can keep the baseline intensity of signals in different channels of the distributed multipoint sensor system at the same level. This avoids repetitive calibrations and streamlines the installation process. View Full-Text
Keywords: gas sensor; AGC; distributed multipoint sensor; optical transmission loss gas sensor; AGC; distributed multipoint sensor; optical transmission loss
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Zhu, C.; Wang, R.; Tao, X.; Wang, G.; Wang, P. A Robust Distributed Multipoint Fiber Optic Gas Sensor System Based on AGC Amplifier Structure. Sensors 2016, 16, 1187.

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