Phase Unwrapping and Frequency Points Subdivision of the Frequency Sweeping Interferometry Based Absolute Ranging System

Frequency sweeping interferometry (FSI) based absolute distance ranging has high precision and no ranging blind area. It can be used to realize large-scale and non-cooperative target measurement. However, the nonlinear frequency modulation of the laser seriously affects the ranging accuracy. In this...

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Detalles Bibliográficos
Autores principales: Song, Luming, Shi, Guang, Liu, Hong, Lin, Hongyi, Zhang, Fumin, Sun, Dong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9028057/
https://www.ncbi.nlm.nih.gov/pubmed/35458889
http://dx.doi.org/10.3390/s22082904
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author Song, Luming
Shi, Guang
Liu, Hong
Lin, Hongyi
Zhang, Fumin
Sun, Dong
author_facet Song, Luming
Shi, Guang
Liu, Hong
Lin, Hongyi
Zhang, Fumin
Sun, Dong
author_sort Song, Luming
collection PubMed
description Frequency sweeping interferometry (FSI) based absolute distance ranging has high precision and no ranging blind area. It can be used to realize large-scale and non-cooperative target measurement. However, the nonlinear frequency modulation of the laser seriously affects the ranging accuracy. In this manuscript, a measurement method assisted by Hilbert Transform (HT) and Chirp-z Transform (CZT) is proposed, which can realize the phase unwrapping of the beat signal, the length reduction in the delay fiber of auxiliary optical path, and the improvement of the frequency resolution. The narrow-band frequency suitable for HT is further studied. In the experiment, the ranging resolution is 70 μm and the standard deviation is 12.6 μm within a distance of 4005 mm.
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spelling pubmed-90280572022-04-23 Phase Unwrapping and Frequency Points Subdivision of the Frequency Sweeping Interferometry Based Absolute Ranging System Song, Luming Shi, Guang Liu, Hong Lin, Hongyi Zhang, Fumin Sun, Dong Sensors (Basel) Article Frequency sweeping interferometry (FSI) based absolute distance ranging has high precision and no ranging blind area. It can be used to realize large-scale and non-cooperative target measurement. However, the nonlinear frequency modulation of the laser seriously affects the ranging accuracy. In this manuscript, a measurement method assisted by Hilbert Transform (HT) and Chirp-z Transform (CZT) is proposed, which can realize the phase unwrapping of the beat signal, the length reduction in the delay fiber of auxiliary optical path, and the improvement of the frequency resolution. The narrow-band frequency suitable for HT is further studied. In the experiment, the ranging resolution is 70 μm and the standard deviation is 12.6 μm within a distance of 4005 mm. MDPI 2022-04-10 /pmc/articles/PMC9028057/ /pubmed/35458889 http://dx.doi.org/10.3390/s22082904 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Song, Luming
Shi, Guang
Liu, Hong
Lin, Hongyi
Zhang, Fumin
Sun, Dong
Phase Unwrapping and Frequency Points Subdivision of the Frequency Sweeping Interferometry Based Absolute Ranging System
title Phase Unwrapping and Frequency Points Subdivision of the Frequency Sweeping Interferometry Based Absolute Ranging System
title_full Phase Unwrapping and Frequency Points Subdivision of the Frequency Sweeping Interferometry Based Absolute Ranging System
title_fullStr Phase Unwrapping and Frequency Points Subdivision of the Frequency Sweeping Interferometry Based Absolute Ranging System
title_full_unstemmed Phase Unwrapping and Frequency Points Subdivision of the Frequency Sweeping Interferometry Based Absolute Ranging System
title_short Phase Unwrapping and Frequency Points Subdivision of the Frequency Sweeping Interferometry Based Absolute Ranging System
title_sort phase unwrapping and frequency points subdivision of the frequency sweeping interferometry based absolute ranging system
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9028057/
https://www.ncbi.nlm.nih.gov/pubmed/35458889
http://dx.doi.org/10.3390/s22082904
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