LAUSR

Abstract A practical dual-path Frequency Modulated Continuous Wave (FMCW) lidar system capable of simultaneous ranging and velocimetry was developed in this work. The setting of dual paths can effectively eliminate the effects of non-linearity of laser. To realize economical and convenient measurement of velocity and distance, the proposed method employed one period of triangular frequency-modulated waveforms on tunable laser to obtain two opposite frequency scanning. The measurement principle of the method was analyzed and deduced. The proposed method was verified by experiments. The distance between two mirrors and velocity in motion below 10 mm/s was measured. The experimental results showed that the mean error of velocity measurement did not exceed 52 μ m∕s and the relative standard deviation was less than 2.5%. For distance measurement between two mirrors, the standard deviation was less than 50 μ m , and the maximum difference between the means was less than 13 μ m .