Adjustable high-spatial-resolution planar plasma velocity measurement system and method

The invention discloses an adjustable high-spatial-resolution planar plasma velocity measurement system and method, and the method comprises the steps: introducing a DMD device into a laser light path system, and carrying out the complex bit type preset frequency modulation of laser, so as to generate laser signals, the frequencies of which are in one-to-one correspondence with two-dimensional spatial positions; the modulated laser signal enters a to-be-detected area in the flow field to react with particles at different spatial positions and radiate fluorescence outwards, and after original spectrum data is collected, spatial inversion is performed through a virtual phase-locked detection algorithm, so that laser-induced fluorescence spectrums corresponding to different spatial position points are obtained, and the measurement accuracy of the laser-induced fluorescence spectrums is improved. And calculating to obtain the speed distribution of the particles in the to-be-measured region. Compared with a tradit