A Sinusoidal Grating Design and Performance Analysis

摘要

Obtain 3-D profilometry of object by phase in optics 3-D techniques, need to project sinusoidal grating on the surface of object measured. To improve the contrast intensity of projection sinusoidal pattern, introduce pulse-width modulation method of electrical engineering to design sinusoidal grating. Firstly, analyze the feasibility of designing sinusoidal grating using high frequency triangular waveforms modulating sinusoidal waveform. Describe light intensity distribution function of 3-D measurement. Give instantiation of creating sinusoidal grating. Finally, analyze frequency spectrum performance for the sinusoidal grating.