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12 March 2020 Absolute distance measurement by dispersive interferometry using an electro-optic comb
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We experimentally demonstrated a method for distance measurement using an electro-optic comb based on dispersive interferometry. An electro-optic comb with the repetition frequency of 10 GHz generated by cascaded phase modulators was adopted as the laser source, and a spectrometer with a sampling interval of 0.02 nm was employed to acquire spectral interference signals. Thus, the non-ambiguity range of about 1.5 cm was obtained in this ranging scheme. Subsequently, a low-cost laser range finder with the accuracy of about 1 mm was employed to work as a rough measurement, and the dispersion interference device worked as fine measurement to conduct an absolute distance measurement. Actual tests proved an agreement within 20 μm over 20 m distance.
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Xianyu Zhao, Xinghua Qu, and Fumin Zhang "Absolute distance measurement by dispersive interferometry using an electro-optic comb", Proc. SPIE 11439, 2019 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 114390X (12 March 2020);

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