Patent ID: 9194751
Filing Date: 2015-11-24
Classification: F41G,G01J,G01S,G02B

Abstract:
1. An optical sensor comprising: a focal-plane array (FPA) imaging detector configured to detect light of a first wavelength range; an illuminated-spot locating detector (ISLD) including an array of light-detecting elements configured to detect light of a second wavelength range, wherein the ISLD has a transparency to light of the first wavelength range; a wavelength-selective optical diffuser configured to diffuse light of the second wavelength range, wherein the shortest wavelength of the first range is larger than the longest wavelength of the second range, the ISLD is positioned such that the light to be detected by the FPA imaging detector first passes through the ISLD, and the FPA imaging detector, the ISLD and the wavelength-selective diffuser share a common optical axis; and a plurality of electronic interface circuits coupled to the ISLD, wherein the electronic interface circuits are associated with the light-detecting elements and coupled to an illuminated-spot centroid determination (ISCD) circuit, the ISCD circuit being configured to determine an angle of incidence of the light of the second wavelength range relative to the common optical axis of the ISLD, the imaging detector, the optical diffuser and the optical imaging system, wherein the electronic interface circuits and the ISCD circuit are located beyond a periphery of an area occupied by the light-detecting elements of the ISLD.