This paper describes a method of measuring distance and angle by dispersive interferometer using a femtosecond pulse laser. The measurement system is set up based on the modified Michelson interferometer, which combines the advantages of using retroreflector and plane-mirror reflector. The two parallel measured beams and one reference beam can undergo a mutual interference in frequency domain. The three shutters are set to two measure arms and reference arm, respectively. the shutters can be used to change the work mode of interference system. The optical path difference of distance and angle can be acquired by the modulated frequency of interference signal. Angle measurement has been compared to a calibrated rotation stage in the range of 1800 arcsec, the obtained mutual agreement is better than 3 arcsec in ordinary laboratory conditions. The results show the method has the potential for further research of absolute multiple degree-of-freedom measurements.
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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