12 January 2018 Distance measurement using frequency-modulated continuous-wave ladar with calibration by a femtosecond frequency comb
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Abstract
Precise distance measurement is of interest for large-scale manufacturing, future space satellite missions, and other industrial applications. The ranging system with femtosecond optical frequency comb (FOFC) could offer high accuracy, stability and direct traceability to SI definition of the meter. Here, we propose a scheme for length measurement based on the frequency-modulated continuous-wave (FMCW) ladar with a FOFC. In this scheme, the reference interferometer in the FMCW ladar is calibrated by the intensity detection using the FOFC in the time domain within an optical wavelength resolution. With analysis of the theoretical model, this system has the potential to a high-speed, high-accuracy absolute distance measurement. Then, based on the experimental results, the evaluation of the performance of the calibration of the reference arm is discussed. In addition, the performance of this system is evaluated by a single position measurement with different tuning velocities of wavelength. The experimental results show that the reproducibility of the distance measurement is 10-5 level.
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Yang Liu, Yang Liu, Linghui Yang, Linghui Yang, Jiarui Lin, Jiarui Lin, Jigui Zhu, Jigui Zhu, } "Distance measurement using frequency-modulated continuous-wave ladar with calibration by a femtosecond frequency comb", Proc. SPIE 10621, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 1062102 (12 January 2018); doi: 10.1117/12.2294991; https://doi.org/10.1117/12.2294991
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