Mr. Xinghua Qu Profile

Xinghua Qu

at Tianjin Univ

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Proceedings Article | 27 November 2023 Paper

Frequency modulation continuous wave speed-distance synchronous measurement with variable period frequency parameter estimation traced to optical frequency comb

Junchen Liu, Mengxin Liu, Wanghang Gu, Fumin Zhang, Xinghua Qu

Proceedings Volume 12769, 1276911 (2023) https://doi.org/10.1117/12.3000131

KEYWORDS: Laser frequency, Frequency modulation, Modulation frequency, Frequency combs, Signal processing, Precision measurement, Laser optics, Laser systems engineering, Target detection, Modulation

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The rapid measurement and demodulation of speed-range information to realize high-speed dynamic target simultaneously is of great significance to the development of industrial manufacturing and precision measurement technology. In the fields of aerospace, industrial automation and machine tool processing, rapid and precise measurement of dynamic target speed distance information is a key method to realize precision measurement, in-situ measurement and running state detection. Frequency Modulated Continuous Wave (FMCW) laser precision measurement technology has the characteristics of no cooperation, high precision, wide measuring range, strong anti-interference ability, etc. It is widely used in industrial measurement field. FMCW laser measurement system synchronously to achieve high speed target still has technical shortcomings. The proposed FMCW velocity-distance synchronous measurement method uses the optical frequency comb as a reference rule to intercept and operate signals at equal frequency intervals. It fits the FMCW laser measurement dynamic target frequency change curve to achieve the frequency parameter estimation of target measurement signals. The problem that FMCW laser measurement of dynamic target is slow and spectrum broadening is serious can’t accurately obtain target speed-distance information is solved. The experimental results show that the proposed method can obtain the speed in the simulation experiment with the target speed of 100m/s and the distance of 100m, and the maximum distance errors are 0.011m/s and 0.00117m respectively. The standard deviation of speed and distance measurement of this method is not higher than 0.090403m/s and 22.46μm in the online high-speed turntable measurement experiment with the speed of 11m/s.

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