Differential type laser-measuring-impact method and device based on partial period demodulation

摘要: The invention relates to a differential type laser-measuring-impact method and device based on partial period demodulation, belongs the technical field of photoelectric measurement. is characterized by comprising following steps: performing optimal estimation sine parameters using model section smaller than one carrier period; applying an result data processing, so as complete instantaneous frequency demodulation laser Doppler signal further acquire impact speed waveforms acceleration waveforms. provided consists 1, beam splitter prism 2, focusing lens 3, measuring surface (a grating) 4, table 5, reflecting mirror 6, 7, 8, converter 9 acquisition system 10. measurement carried out utilizing has advantages that temporal resolution high, algorithm absolutely convergent, high adaptation robustness for non-stable time-domain signals are achieved, traceable calibration can be conveniently out.