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

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 tr...

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Autores principales: Wei, Hou-Zhen, Xu, Dong-Sheng, Meng, Qing-Shan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5948587/
https://www.ncbi.nlm.nih.gov/pubmed/29561810
http://dx.doi.org/10.3390/s18040932
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author Wei, Hou-Zhen
Xu, Dong-Sheng
Meng, Qing-Shan
author_facet Wei, Hou-Zhen
Xu, Dong-Sheng
Meng, Qing-Shan
author_sort Wei, Hou-Zhen
collection PubMed
description 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.
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spelling pubmed-59485872018-05-17 A Newly Designed Fiber-Optic Based Earth Pressure Transducer with Adjustable Measurement Range Wei, Hou-Zhen Xu, Dong-Sheng Meng, Qing-Shan Sensors (Basel) Article 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. MDPI 2018-03-21 /pmc/articles/PMC5948587/ /pubmed/29561810 http://dx.doi.org/10.3390/s18040932 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wei, Hou-Zhen
Xu, Dong-Sheng
Meng, Qing-Shan
A Newly Designed Fiber-Optic Based Earth Pressure Transducer with Adjustable Measurement Range
title A Newly Designed Fiber-Optic Based Earth Pressure Transducer with Adjustable Measurement Range
title_full A Newly Designed Fiber-Optic Based Earth Pressure Transducer with Adjustable Measurement Range
title_fullStr A Newly Designed Fiber-Optic Based Earth Pressure Transducer with Adjustable Measurement Range
title_full_unstemmed A Newly Designed Fiber-Optic Based Earth Pressure Transducer with Adjustable Measurement Range
title_short A Newly Designed Fiber-Optic Based Earth Pressure Transducer with Adjustable Measurement Range
title_sort newly designed fiber-optic based earth pressure transducer with adjustable measurement range
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5948587/
https://www.ncbi.nlm.nih.gov/pubmed/29561810
http://dx.doi.org/10.3390/s18040932
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