Doppler velocimeter and apparatus using the same.

摘要

This invention is characterized in that a light beam from a light source is made to enter a diffraction grating and +/- nth-order (n = 1, 2, ...) diffracted lights from the diffraction grating is made to enter a moving object at an angle substantially equal to the angle of intersection of the angles of diffraction of the two diffracted lights from the diffraction grating so that the two diffracted lights are converged on the moving object and intersect with each other, and scattered light subjected to Doppler shift by the moving object is detected by photodetector thereby detecting the velocity information of the moving object. <IMAGE>