High-resolution frequency-modulated continuous-wave laser ranging for precision distance metrology applications

Guang Shi; Fumin Zhang; Xing-Hua Qu; Xiangsong Meng

doi:10.1117/1.OE.53.12.122402

6 May 2014 High-resolution frequency-modulated continuous-wave laser ranging for precision distance metrology applications

Guang Shi, Fumin Zhang, Xing-Hua Qu, Xiangsong Meng

Author Affiliations +

Optical Engineering, Vol. 53, Issue 12, 122402 (May 2014). https://doi.org/10.1117/1.OE.53.12.122402

Abstract

Frequency-modulated continuous wave (FMCW) laser ranging is one of the most interesting techniques for precision distance metrology. In order to ensure the theoretical measurement range and precision, a narrow linewidth external cavity tunable laser with large tuning range is chosen. In practical situations, the tuning nonlinearity of the laser reduces the measurement precision, hence an auxiliary interferometer is used to measure the laser tuning rate and linearize the frequency ramp. Then, fast Fourier transform algorithm is applied to the resampled signal of the main interferometer, and the full-width at half maximum of the frequency spectrum is narrowed. In the end, the experiments are carried out using the FMCW laser ranging system and demonstrate 50-μm range resolution at 8.7 m.

Citation Download Citation

Guang Shi, Fumin Zhang, Xing-Hua Qu, and Xiangsong Meng "High-resolution frequency-modulated continuous-wave laser ranging for precision distance metrology applications," Optical Engineering 53(12), 122402 (6 May 2014). https://doi.org/10.1117/1.OE.53.12.122402

Published: 6 May 2014

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