High resolution distance measurement using reverse frequency sample method

Tong Zhang; Fumin Zhang; Xinghua Qu

doi:10.1117/12.2504939

12 December 2018 High resolution distance measurement using reverse frequency sample method

Tong Zhang, Fumin Zhang, Xinghua Qu

Proceedings Volume 10846, Optical Sensing and Imaging Technologies and Applications; 108461J (2018) https://doi.org/10.1117/12.2504939
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China

Abstract

The spatial resolution of frequency-modulated continuous wave(FMCW) laser ranging technology is limited by the frequency sweep non-linearity. The typical method for suppressing the influence of sweep non-linearity is that using an auxiliary interference signal to sample the measurement signal at the equal frequency intervals. The ranging scale of this method is restricted by the optical path difference of the auxiliary interferometry. We have presented a reverse frequency sample method that using measurement signal to sample the auxiliary signal, the range can be acquired from the ratio of the optical path difference of the auxiliary interferometry to the frequency of the resample signal. The experiment has verified that the reverse frequency sample method can measure the distance longer than the optical path difference, increasing the available ranging scale compared to the typical frequency sample method. This method can also avoid the influence of frequency sweep non-linearity on the range profile. The range resolution is reduced to 50μm with the decreasing of the measurement range and auxiliary optical path difference. The range accuracy of the experimental system based this method is 57μm.

Citation Download Citation

Tong Zhang, Fumin Zhang, and Xinghua Qu "High resolution distance measurement using reverse frequency sample method", Proc. SPIE 10846, Optical Sensing and Imaging Technologies and Applications, 108461J (12 December 2018); https://doi.org/10.1117/12.2504939

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