Anti-disturbance time-frequency domain wave-front detection method
A technology of wavefront detection and time-frequency domain, applied in the field of optical measurement, can solve problems such as poor anti-interference ability, and achieve good anti-disturbance, light weight, and simple system effect
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[0057] 1) Collect a series of interferograms
[0058] The resolution of the simulated interferogram is 128*128, and the average light intensity of the interference field I 0 =120, contrast ratio V=5 / 6, phase shift rate f 0 =20Hz, the environmental vibration is the cosine of frequency 2Hz, amplitude 0.85λ, light intensity fluctuation σ=1 caused by random noise. Sampling frequency f s =100Hz, the number of frames to collect the interferogram is 100 frames, that is, the sampling time is 1s.
[0059] with f s =100Hz sampling frequency to collect a series of interferograms and store them in the computer.
[0060] At this time, the time-series light intensity sequence obtained on any pixel point (x, y) at the same position in each interferogram is expressed by the following formula:
[0061]
[0062] At the same time, a 128*128 blank matrix A (128, 128) is established to store the calculated value of the initial phase of each pixel obtained in step 6).
[0063] 2) The light...
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