Special Section on Advances of Precision Optical Measurements and Instrumentation for Geometrical and Mechanical Quantities

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

[+] Author Affiliations
Guang Shi

Tianjin University, State Key Laboratory of Precision Measuring Technology and Instruments, 92 Weijin Road, Tianjin 300072, China

Fumin Zhang

Tianjin University, State Key Laboratory of Precision Measuring Technology and Instruments, 92 Weijin Road, Tianjin 300072, China

Xinghua Qu

Tianjin University, State Key Laboratory of Precision Measuring Technology and Instruments, 92 Weijin Road, Tianjin 300072, China

Xiangsong Meng

Tianjin University, State Key Laboratory of Precision Measuring Technology and Instruments, 92 Weijin Road, Tianjin 300072, China

Opt. Eng. 53(12), 122402 (May 06, 2014). doi:10.1117/1.OE.53.12.122402
History: Received November 22, 2013; Revised January 17, 2014; Accepted January 27, 2014
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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.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Guang Shi ; Fumin Zhang ; Xinghua Qu and Xiangsong Meng
"High-resolution frequency-modulated continuous-wave laser ranging for precision distance metrology applications", Opt. Eng. 53(12), 122402 (May 06, 2014). ; http://dx.doi.org/10.1117/1.OE.53.12.122402


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