Patent ID: 9030668
Filing Date: 2015-05-12
Classification: G01B,G03F

Abstract:
1. A system, comprising: a fringe projection system that includes an aperture plate and an optical deflector and that provides a first fringe pattern associated with a first spatial frequency based on a first diffraction grating period and a second fringe pattern associated with a second spatial frequency based on a second diffraction grating period to a first surface area and a second surface area, respectively; and a detector that receives an optical signal associated with the first fringe pattern and the second fringe pattern at a common detector area, and produce a detected fringe signal corresponding to the first spatial frequency or the second spatial frequency, wherein the aperture plate is situated to select +1 and −1 diffraction orders associated with at least one of the first diffraction grating period or the second diffraction grating period, and wherein the optical deflector is situated to direct at least one of the first fringe pattern or the second fringe pattern to the first surface or the second surface, respectively.