Patent ID: 7378643
Filing Date: 2008-05-27
Classification: G01D

Abstract:
1. An Optical Projection Encoder (“OPE”) comprising: an emitter module including a light source configured to transmit emitted optical radiation to a moving object; a detector module including an array of photo-detectors to receive reflected optical radiation from the moving object; a transmissive layer configured to encapsulate both the emitter module and the detector module; and a mask located between the transmissive layer and the moving object, wherein the emitted optical radiation is passed through the mask, with the mask generating an image of a predetermined pattern that is reflected from the moving object to the detector module together with an image of the surface texture of the moving object, wherein the detector module is configured to acquire a comparison image using the emitted optical radiation reflected from the moving object, the comparison image including the image of the predetermined pattern and the image of the surface texture of the moving object.