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Optical Fiber Displacement Sensor Based on Microwave Photonics Interferometry

An optical fiber displacement sensor based on the microwave photonics interferometric (MWPI) method is proposed and experimented, which provides an ideal solution for large range displacement measurement with high resolution. The sensor used a Michelson microwave photonics interferometer to sense th...

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Detalles Bibliográficos
Autores principales: Dong, Hao, Liu, Shicheng, Yang, Liming, Peng, Jiangbo, Cheng, Keming
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6264062/
https://www.ncbi.nlm.nih.gov/pubmed/30384447
http://dx.doi.org/10.3390/s18113702
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author Dong, Hao
Liu, Shicheng
Yang, Liming
Peng, Jiangbo
Cheng, Keming
author_facet Dong, Hao
Liu, Shicheng
Yang, Liming
Peng, Jiangbo
Cheng, Keming
author_sort Dong, Hao
collection PubMed
description An optical fiber displacement sensor based on the microwave photonics interferometric (MWPI) method is proposed and experimented, which provides an ideal solution for large range displacement measurement with high resolution. The sensor used a Michelson microwave photonics interferometer to sense the displacement with one sensing arm and a length-adjusted reference arm. The displacement variation would change the period of the microwave response function of the interferometer. According to the principle that the phase difference in one free spectral range (FSR) of the microwave response function is 360°, the displacement can be retrieved by the microwave response function by means of a vector network analyzer (VNA). A programmable path-switching true time delay line was used in the reference arm to decrease the microwave bandwidth. The measurement results show that the displacement sensing range is larger than 3 m and the measurement resolution is 31 μm. Finally, the measurement stability is tested, and the factors affecting the measurement resolution of this method and the main source of errors are investigated in detail.
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spelling pubmed-62640622018-12-12 Optical Fiber Displacement Sensor Based on Microwave Photonics Interferometry Dong, Hao Liu, Shicheng Yang, Liming Peng, Jiangbo Cheng, Keming Sensors (Basel) Article An optical fiber displacement sensor based on the microwave photonics interferometric (MWPI) method is proposed and experimented, which provides an ideal solution for large range displacement measurement with high resolution. The sensor used a Michelson microwave photonics interferometer to sense the displacement with one sensing arm and a length-adjusted reference arm. The displacement variation would change the period of the microwave response function of the interferometer. According to the principle that the phase difference in one free spectral range (FSR) of the microwave response function is 360°, the displacement can be retrieved by the microwave response function by means of a vector network analyzer (VNA). A programmable path-switching true time delay line was used in the reference arm to decrease the microwave bandwidth. The measurement results show that the displacement sensing range is larger than 3 m and the measurement resolution is 31 μm. Finally, the measurement stability is tested, and the factors affecting the measurement resolution of this method and the main source of errors are investigated in detail. MDPI 2018-10-31 /pmc/articles/PMC6264062/ /pubmed/30384447 http://dx.doi.org/10.3390/s18113702 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
Dong, Hao
Liu, Shicheng
Yang, Liming
Peng, Jiangbo
Cheng, Keming
Optical Fiber Displacement Sensor Based on Microwave Photonics Interferometry
title Optical Fiber Displacement Sensor Based on Microwave Photonics Interferometry
title_full Optical Fiber Displacement Sensor Based on Microwave Photonics Interferometry
title_fullStr Optical Fiber Displacement Sensor Based on Microwave Photonics Interferometry
title_full_unstemmed Optical Fiber Displacement Sensor Based on Microwave Photonics Interferometry
title_short Optical Fiber Displacement Sensor Based on Microwave Photonics Interferometry
title_sort optical fiber displacement sensor based on microwave photonics interferometry
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6264062/
https://www.ncbi.nlm.nih.gov/pubmed/30384447
http://dx.doi.org/10.3390/s18113702
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