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Open AccessArticle

A Newly Designed Fiber-Optic Based Earth Pressure Transducer with Adjustable Measurement Range

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State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
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School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, 1037 Luoyu Rd., Wuhan 430074, China
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Authors to whom correspondence should be addressed.
Sensors 2018, 18(4), 932; https://doi.org/10.3390/s18040932
Received: 3 February 2018 / Revised: 14 March 2018 / Accepted: 15 March 2018 / Published: 21 March 2018
(This article belongs to the Special Issue Recent Advances in Fiber Bragg Grating Based Sensors)
A novel fiber-optic based earth pressure sensor (FPS) with an adjustable measurement range and high sensitivity is developed to measure earth pressures for civil infrastructures. The new FPS combines a cantilever beam with fiber Bragg grating (FBG) sensors and a flexible membrane. Compared with a traditional pressure transducer with a dual diaphragm design, the proposed FPS has a larger measurement range and shows high accuracy. The working principles, parameter design, fabrication methods, and laboratory calibration tests are explained in this paper. A theoretical solution is derived to obtain the relationship between the applied pressure and strain of the FBG sensors. In addition, a finite element model is established to analyze the mechanical behavior of the membrane and the cantilever beam and thereby obtain optimal parameters. The cantilever beam is 40 mm long, 15 mm wide, and 1 mm thick. The whole FPS has a diameter of 100 mm and a thickness of 30 mm. The sensitivity of the FPS is 0.104 kPa/με. In addition, automatic temperature compensation can be achieved. The FPS’s sensitivity, physical properties, and response to applied pressure are extensively examined through modeling and experiments. The results show that the proposed FPS has numerous potential applications in soil pressure measurement. View Full-Text
Keywords: pressure transducer; soil pressure; sensor design; temperature compensation; Fiber Bragg grating pressure transducer; soil pressure; sensor design; temperature compensation; Fiber Bragg grating
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MDPI and ACS Style

Wei, H.-Z.; Xu, D.-S.; Meng, Q.-S. A Newly Designed Fiber-Optic Based Earth Pressure Transducer with Adjustable Measurement Range. Sensors 2018, 18, 932.

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