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Open AccessArticle

Monolithic Structure-Optical Fiber Sensor with Temperature Compensation for Pressure Measurement

1
School of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China
2
School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, China
3
School of mathematics and computer science, Guangdong Ocean University, Zhanjiang 524088, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(4), 552; https://doi.org/10.3390/ma12040552
Received: 7 January 2019 / Revised: 3 February 2019 / Accepted: 4 February 2019 / Published: 13 February 2019
(This article belongs to the Special Issue Structural Health Monitoring for Civil Engineering Materials)
In this paper, an optical fiber pressure sensor cascading a diaphragm-assisted Fabry-Perot interferometer (FPI) and a fiber Bragg grating (FBG) is proposed and demonstrated. The sensor comprises an optical fiber, a fused-silica ferrule, and a fused-silica diaphragm. We use a femtosecond laser firstly to fabricate a pit on the end face of the ferrule and then investigate the laser heat conduction welding and deep penetration welding technology for manufacturing the seepage pressure sensor of the all-fused-silica material. We develop a sensor based on a monolithic structured FPI without adhesive bonding by means of all-laser-welding. The pressure characteristics of the sensor have good linearity at different temperatures. Also, the monolithic structured sensor possesses excellent resolution, hysteresis, and long-term stability. The environmental temperature obtained by the FBG is employed to compensate for the difference in seepage pressure at different temperatures, and the difference in seepage pressure responses at different temperatures is shown to be very small after temperature compensation. View Full-Text
Keywords: optical fiber sensor; laser welding; pressure; Fabry-Perot interferometer; fiber Bragg grating optical fiber sensor; laser welding; pressure; Fabry-Perot interferometer; fiber Bragg grating
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MDPI and ACS Style

Wang, W.; Zhou, X.; Wu, W.; Chen, J.; He, S.; Guo, W.; Gao, J.; Huang, S.; Chen, X. Monolithic Structure-Optical Fiber Sensor with Temperature Compensation for Pressure Measurement. Materials 2019, 12, 552.

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