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Method for high-precision distance estimation and dispersion mismatch compensation in frequency scanning interferometry
Author(s): Hao Pan; Xinghua Qu; Fumin Zhang
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Paper Abstract

The long fiber frequency sampling method has been widely used to eliminate the nonlinearity of laser tuning in the frequency-modulated continuous wave laser ranging technique. Then, fast Fourier transform (FFT) is performed on the resampling signal to obtain the distance spectral information. However, due to the picket fence and leakage of FFT-based methods, it is hard to find the precise location and achieve better range precision. In this paper, we propose a novel frequency estimation method, multiple signal classification (MUSIC), to be used instead of the conventional fast Fourier transform (FFT)-based algorithm to obtain better range precision. In addition, the induced-fiber dispersion could also lead to poor accuracy and precision in the large-bandwidth and long-distance measurements scenes. To solve this problem, a phase compensation method for resolution-enhancement is proposed.

Paper Details

Date Published: 7 March 2019
PDF: 7 pages
Proc. SPIE 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation, 110530J (7 March 2019); doi: 10.1117/12.2511747
Show Author Affiliations
Hao Pan, Tianjin Univ. (China)
Xinghua Qu, Tianjin Univ. (China)
Fumin Zhang, Tianjin Univ. (China)

Published in SPIE Proceedings Vol. 11053:
Tenth International Symposium on Precision Engineering Measurements and Instrumentation
Jiubin Tan; Jie Lin, Editor(s)

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