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Sensors 2017, 17(2), 374; doi:10.3390/s17020374

Optical Sensor of Thermal Gas Flow Based on Fiber Bragg Grating

1
College of Information Science and Technology, Heilongjiang University, Harbin 150080, China
2
Research Center for Fiber Optic Sensing Technology National Local Joint Engineering, Electronic Engineering College, Heilongjiang University, Harbin 150080, China
3
Physics Department, Harbin Institute of Technology, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Academic Editors: Christophe Caucheteur and Tuan Guo
Received: 14 December 2016 / Revised: 10 February 2017 / Accepted: 13 February 2017 / Published: 15 February 2017
(This article belongs to the Special Issue Recent Advances in Fiber Bragg Grating Sensing)
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Abstract

This paper aims at solving the problem of explosion proof in measurement of thermal gas flow using electronic sensor by presenting a new type of flow sensor by optical fiber heating. A measuring unit based on fiber Bragg grating (FBG) for fluid temperature and a unit for heat dissipation are designed to replace the traditional electronic sensors. The light in C band from the amplified spontaneous emission (ASE) light source is split, with one part used to heat the absorbing coating and the other part used in the signal processing unit. In the heating unit, an absorbing coating is introduced to replace the traditional resistance heating module to minimize the risk of explosion. The measurement results demonstrate a fine consistency between the flow and temperature difference in simulation. The method to enhance the measurement resolution of flow is also discussed. View Full-Text
Keywords: fiber Bragg grating; heat flow sensor; constant power method; light absorbing coating fiber Bragg grating; heat flow sensor; constant power method; light absorbing coating
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Jiang, X.; Wang, K.; Li, J.; Zhan, H.; Song, Z.; Che, G.; Lyu, G. Optical Sensor of Thermal Gas Flow Based on Fiber Bragg Grating. Sensors 2017, 17, 374.

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