ABSOLUTE DISTANCE MEASUREMENT IN AIR USING DUAL FEMTOSECOND LASERS

Guanhao Wu, Luofeng Shen, Kai Ni, Weihu Zhou, Qian Zhou

Abstract

A dual-comb-based distance measurement method is proposed, which can measure the optical distance of the fundamental and the second harmonics simultaneously, so that two-color method can be applied to correct the refractive index of air. In a 1.6 m long distance measurement, the stability is about 10 µm. In the step-by-step linear test with a range of 1.2 m, the measurement accuracy is demonstrated to be about 20 µm. The results show the present method can be applied in practical distance measurement.

Keywords

dual frequency comb, distance measurement, the refractive index of air

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DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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