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Optical Engineering

High-resolution frequency-modulated continuous-wave laser ranging for precision distance metrology applications
Author(s): Guang Shi; Fumin Zhang; Xing-Hua Qu; Xiangsong Meng
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Paper 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-<italic<μ</italic<m range resolution at 8.7 m.

Paper Details

Date Published: 6 May 2014
PDF: 7 pages
Opt. Eng. 53(12) 122402 doi: 10.1117/1.OE.53.12.122402
Published in: Optical Engineering Volume 53, Issue 12
Show Author Affiliations
Guang Shi, Tianjin Univ. (China)
Fumin Zhang, Tianjin Univ. (China)
Xing-Hua Qu, Tianjin Univ. (China)
Xiangsong Meng, Tianjin Univ. (China)

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