Patent ID: 9213227
Filing Date: 2015-12-15
Classification: G01B,G01J,G02B,G03B,G03F

Abstract:
1. An optical imaging system having an optical axis and operable to produce a data output representing a height profile of a predetermined surface being imaged, the imaging optical system comprising: a fringe projection system structured to optically image a first light pattern, defined by a fringe generating module inside the fringe projection system in polychromatic light incident onto the fringe generating module, onto the predetermined surface in a first direction that is oblique with respect to the predetermined surface to form a second light pattern thereon, a fringe detection system including a detector having a two-dimensional array of pixels defining a detection surface and a first optical filter integrated with the detection surface; a fringe relay system disposed between the fringe projection system and the fringe detection system and configured to optically image the second light pattern onto the detection surface to form an image of the second light pattern thereon, the image of the second light pattern being spatially-periodic in a third direction; and a second optical filter disposed across the optical axis and configured to modify at least one of a spectrum, state of polarization, phase, and irradiance of light delivered to said detection surface such as to compensate an error contributed to the data output by a Goos-Hanchen shift experienced by the polychromatic light at the predetermined surface.