The study of the nonlinear correction of the FMCW absolute distance measurement using frequency-sampling and precision analysis

Cheng Lu; Yu Gan; Fengdong Chen; Bingguo Liu; Zhitao Zhuang; Xinke Xu; Guodong Liu

doi:10.1117/12.2072141

3 December 2014 The study of the nonlinear correction of the FMCW absolute distance measurement using frequency-sampling and precision analysis

Cheng Lu, Yu Gan, Fengdong Chen, Bingguo Liu, Zhitao Zhuang, Xinke Xu, Guodong Liu

Author Affiliations +

Proceedings Volume 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors; 929712 (2014) https://doi.org/10.1117/12.2072141
Event: International Symposium on Optoelectronic Technology and Application 2014, 2014, Beijing, China

Abstract

This article uses the external cavity laser to realize FMCW high precision absolute distance measurement, as the external cavity laser owns the advantage of large tuning range of frequency. Firstly, aim at the problem of nonlinear tuning of the external cavity laser, a study of method of frequency-sampling has been shown. Secondly, in this article the mathematical model of the absolute dis tance measurement system has been established, and the sources of the errors of the FMCW absolute distance measurement has been analyzed, and the accuracy model has been established. Finally, a ball which is put at a distance about 3 meters is measured, and the random error is 0.3479μm, the standard uncertainty of measurement system is 0.3479μm+3.141Rppm.

Citation Download Citation

Cheng Lu, Yu Gan, Fengdong Chen, Bingguo Liu, Zhitao Zhuang, Xinke Xu, and Guodong Liu "The study of the nonlinear correction of the FMCW absolute distance measurement using frequency-sampling and precision analysis", Proc. SPIE 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors, 929712 (3 December 2014); https://doi.org/10.1117/12.2072141

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