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Open AccessArticle

Highly Integrated All-Fiber FP/FBG Sensor for Accurate Measurement of Strain under High Temperature

1
Fiber Optics Research Center, Key Laboratory of Optical Fiber Sensing & Communications (Ministry of Education), University of Electronic Science & Technology of China, Chengdu 611731, China
2
Department of Physics, Northwest University, Taibai Beilu 229, Xi’an 710069, China
3
Nuclear Power Institute of China, Chengdu 610041, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(10), 1867; https://doi.org/10.3390/ma11101867
Received: 5 September 2018 / Revised: 27 September 2018 / Accepted: 28 September 2018 / Published: 1 October 2018
(This article belongs to the Special Issue Electronic Skin and Its Strain Sensing Application)
Accurate measurement of strain is one of the most important issues for high temperature environments. We present a highly integrated all-fiber sensor to achieve precise measurements of strain/high-pressure, which consists of a fiber Bragg grating (FBG) inscribed by an 800 nm femtosecond laser cascaded with a micro extrinsic Fabry–Perot (FP) cavity fabricated by the 157 nm laser micromachining technique. FBG is sensitive to temperature, but insensitive to strain/pressure, whereas the FP is sensitive to strain/pressure, but has a small dependence on temperature. Therefore, such a cascaded sensor could be used for dual-parameter measurement and can work well at high temperatures. Experimental results indicate that this device exhibits a good strain characteristic at high temperatures and excellent high-pressure performance at room temperature. Due to its highly sensitive wavelength response, the proposed sensor will have remarkable potential applications in dual parameter sensing in harsh environments. View Full-Text
Keywords: optical fiber sensors; strain/pressure sensing; Fabry–Perot; FBG; dual-parameter measurement; high temperature optical fiber sensors; strain/pressure sensing; Fabry–Perot; FBG; dual-parameter measurement; high temperature
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MDPI and ACS Style

Yang, T.; He, X.; Ran, Z.; Xie, Z.; Rao, Y.; Qiao, X.; He, Z.; He, P. Highly Integrated All-Fiber FP/FBG Sensor for Accurate Measurement of Strain under High Temperature. Materials 2018, 11, 1867.

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