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17 September 2019 Response time analysis of hot-wire-based gas velocity sensor using optical fiber
Jiqiang Wang, Zhen Li, Tongyu Liu, Moyu Hou, Lin Zhao, Guofeng Dong
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Proceedings Volume 11144, Photonics and Education in Measurement Science 2019; 1114418 (2019) https://doi.org/10.1117/12.2531836
Event: Joint TC1 - TC2 International Symposium on Photonics and Education in Measurement Science 2019, 2019, Jena, Germany
Abstract
Built on a design developed from an advanced mathematical model, a practical fiber optic sensor, which is an analog of the familiar ‘hot-wire’ wind velocity monitor is developed, as an intrinsically-safe sensor device for coal mining monitoring applications. The underpinning optical fiber-based principle used is the shift in the center wavelength of a Fiber Bragg Grating which is cooled by the gas flowing over it and the device sensitivity found was determined to be ~1370pm per unit m/s wind velocity (in the range of 0-0.57 m/s), ~109pm per unit m/s in the range 0.57-2.26 m/s and ~33pm per unit m/s in the range of 2.26-5.66 m/s. In this paper, the factors that influence the device response time, such as the sensor probe surface heat transfer coefficient, wind (gas) velocity and pump power have been investigated in the laboratory. It was found that the greater the surface dissipation factor of the sensor, the shorter the response time, furthermore, the response time was observed to decrease as the wind velocity increased. A method of further shortening sensor response time using wind speed variation slope is proposed.
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Jiqiang Wang, Zhen Li, Tongyu Liu, Moyu Hou, Lin Zhao, and Guofeng Dong "Response time analysis of hot-wire-based gas velocity sensor using optical fiber", Proc. SPIE 11144, Photonics and Education in Measurement Science 2019, 1114418 (17 September 2019); https://doi.org/10.1117/12.2531836
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KEYWORDS
Sensors
Fiber Bragg gratings
Optical fibers
Fiber optics
Fiber optics sensors
Mining
Velocity measurements
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