Method for high-precision distance estimation and dispersion mismatch compensation in frequency scanning interferometry

Hao Pan; Xinghua Qu; Fumin Zhang

doi:10.1117/12.2511747

7 March 2019 Method for high-precision distance estimation and dispersion mismatch compensation in frequency scanning interferometry

Hao Pan, Xinghua Qu, Fumin Zhang

Author Affiliations +

Proceedings Volume 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation; 110530J (2019) https://doi.org/10.1117/12.2511747
Event: 10th International Symposium on Precision Engineering Measurements and Instrumentation (ISPEMI 2018), 2018, Kunming, China

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.

Citation Download Citation

Hao Pan, Xinghua Qu, and Fumin Zhang "Method for high-precision distance estimation and dispersion mismatch compensation in frequency scanning interferometry", Proc. SPIE 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation, 110530J (7 March 2019); https://doi.org/10.1117/12.2511747

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