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Sensors 2018, 18(4), 1011;

Diaphragm-Free Fiber-Optic Fabry-Perot Interferometric Gas Pressure Sensor for High Temperature Application

Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China
Author to whom correspondence should be addressed.
Received: 8 February 2018 / Revised: 24 March 2018 / Accepted: 27 March 2018 / Published: 28 March 2018
(This article belongs to the Section Physical Sensors)
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A diaphragm-free fiber-optic Fabry-Perot (FP) interferometric gas pressure sensor is designed and experimentally verified in this paper. The FP cavity was fabricated by inserting a well-cut fiber Bragg grating (FBG) and hollow silica tube (HST) from both sides into a silica casing. The FP cavity length between the ends of the SMF and HST changes with the gas density. Using temperature decoupling method to improve the accuracy of the pressure sensor in high temperature environments. An experimental system for measuring the pressure under different temperatures was established to verify the performance of the sensor. The pressure sensitivity of the FP gas pressure sensor is 4.28 nm/MPa with a high linear pressure response over the range of 0.1–0.7 MPa, and the temperature sensitivity is 14.8 pm/°C under the range of 20–800 °C. The sensor has less than 1.5% non-linearity at different temperatures by using temperature decoupling method. The simple fabrication and low-cost will help sensor to maintain the excellent features required by pressure measurement in high temperature applications. View Full-Text
Keywords: fiber-optic; Fabry-Perot; FBG; gas pressure sensor; high temperature fiber-optic; Fabry-Perot; FBG; gas pressure sensor; high temperature

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Liang, H.; Jia, P.; Liu, J.; Fang, G.; Li, Z.; Hong, Y.; Liang, T.; Xiong, J. Diaphragm-Free Fiber-Optic Fabry-Perot Interferometric Gas Pressure Sensor for High Temperature Application. Sensors 2018, 18, 1011.

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