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A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform

This paper proposes a two-dimensional precision level for real-time measurement using a zoom fast Fourier transform (zoom FFT)-based decoupling algorithm that was developed and integrated in an FPGA. This algorithm solves the contradiction between obtaining high resolution and obtaining high measure...

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Detalles Bibliográficos
Autores principales: Fu, Haijin, Wang, Zheng, Lin, Xionglei, Xing, Xu, Yang, Ruitao, Yang, Hongxing, Hu, Pengcheng, Ding, Xuemei, Yu, Liang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10673262/
https://www.ncbi.nlm.nih.gov/pubmed/38004885
http://dx.doi.org/10.3390/mi14112028
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author Fu, Haijin
Wang, Zheng
Lin, Xionglei
Xing, Xu
Yang, Ruitao
Yang, Hongxing
Hu, Pengcheng
Ding, Xuemei
Yu, Liang
author_facet Fu, Haijin
Wang, Zheng
Lin, Xionglei
Xing, Xu
Yang, Ruitao
Yang, Hongxing
Hu, Pengcheng
Ding, Xuemei
Yu, Liang
author_sort Fu, Haijin
collection PubMed
description This paper proposes a two-dimensional precision level for real-time measurement using a zoom fast Fourier transform (zoom FFT)-based decoupling algorithm that was developed and integrated in an FPGA. This algorithm solves the contradiction between obtaining high resolution and obtaining high measurement speed, and achieves both high angle-resolution measurement and real-time measurement. The proposed level adopts a silicone-oil surface as the angle-sensitive interface and combines the principle of homodyne interference. By analyzing the frequency of the interference fringes, the angle variation can be determined. The zoom-FFT-based decoupling algorithm improves the system’s frequency resolution of the interference fringes, thereby significantly enhancing the angle resolution. Furthermore, this algorithm improves the efficiency of angle decoupling, while the angle decoupling process can also be transplanted to the board to realize real-time measurement of the level. Finally, a prototype based on the level principle was tested to validate the effectiveness of the proposed method. The principle analysis and test results showed that the angle resolution of the prototype improved from 9 arcsec to about 0.1 arcsec using this angle-solution method. At the same time, the measurement repeatability of the prototype was approximately ±0.2 arcsec. In comparison with a commercial autocollimator, the angle measurement accuracy reached ±0.6 arcsec.
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spelling pubmed-106732622023-10-30 A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform Fu, Haijin Wang, Zheng Lin, Xionglei Xing, Xu Yang, Ruitao Yang, Hongxing Hu, Pengcheng Ding, Xuemei Yu, Liang Micromachines (Basel) Article This paper proposes a two-dimensional precision level for real-time measurement using a zoom fast Fourier transform (zoom FFT)-based decoupling algorithm that was developed and integrated in an FPGA. This algorithm solves the contradiction between obtaining high resolution and obtaining high measurement speed, and achieves both high angle-resolution measurement and real-time measurement. The proposed level adopts a silicone-oil surface as the angle-sensitive interface and combines the principle of homodyne interference. By analyzing the frequency of the interference fringes, the angle variation can be determined. The zoom-FFT-based decoupling algorithm improves the system’s frequency resolution of the interference fringes, thereby significantly enhancing the angle resolution. Furthermore, this algorithm improves the efficiency of angle decoupling, while the angle decoupling process can also be transplanted to the board to realize real-time measurement of the level. Finally, a prototype based on the level principle was tested to validate the effectiveness of the proposed method. The principle analysis and test results showed that the angle resolution of the prototype improved from 9 arcsec to about 0.1 arcsec using this angle-solution method. At the same time, the measurement repeatability of the prototype was approximately ±0.2 arcsec. In comparison with a commercial autocollimator, the angle measurement accuracy reached ±0.6 arcsec. MDPI 2023-10-30 /pmc/articles/PMC10673262/ /pubmed/38004885 http://dx.doi.org/10.3390/mi14112028 Text en © 2023 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
Fu, Haijin
Wang, Zheng
Lin, Xionglei
Xing, Xu
Yang, Ruitao
Yang, Hongxing
Hu, Pengcheng
Ding, Xuemei
Yu, Liang
A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform
title A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform
title_full A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform
title_fullStr A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform
title_full_unstemmed A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform
title_short A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform
title_sort two-dimensional precision level for real-time measurement based on zoom fast fourier transform
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10673262/
https://www.ncbi.nlm.nih.gov/pubmed/38004885
http://dx.doi.org/10.3390/mi14112028
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