An infrared camera including optics and a detector sensitive to infrared radiation is used in conjunction with at least one light source, such as a laser, to locate a reference point on a target. Two intersecting line segments are produced by the one light source or a combination of two light sources...http://www.google.de/patents/US7820967?utm_source=gb-gplus-sharePatent US7820967 - Infrared camera for locating a target using at least one shaped light source
