3 December 2014 The study of the nonlinear correction of the FMCW absolute distance measurement using frequency-sampling and precision analysis
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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.
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Cheng Lu, Cheng Lu, Yu Gan, Yu Gan, Fengdong Chen, Fengdong Chen, Bingguo Liu, Bingguo Liu, Zhitao Zhuang, Zhitao Zhuang, Xinke Xu, Xinke Xu, Guodong Liu, 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); doi: 10.1117/12.2072141; https://doi.org/10.1117/12.2072141
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