Patent ID: 7985953
Filing Date: 2011-07-26
Classification: G01J,G08B

Abstract:
1. A radiant energy detector comprising: a support member; a plurality of series connected infrared radiation sensors carried by the support member, the sensors each defined by a thermopile having a heat sink side thermally coupled to the support member and a membrane side, the sensors respond to infrared radiation having a wavelength in a 5-to 14-μm wavelength band; a plurality of lenses, the lenses direct incident infrared radiation onto respective membrane sides of the sensors, and the lenses alter an intrinsic spatial sensitivity of the respective sensors; and an additional wide angle radiant energy detector sensitive in a range of 0.8-1.2 um to discriminate between flaming fire and human emitted radiant energy wherein the plurality of series connected infrared radiation sensors continuously track human presence across a field of view including in the absence of motion based upon the infrared radiation directed by the lenses onto the membrane sides of the sensors, and wherein an angle of arrival of the incident infrared radiation is determined by a response of each of the sensors to the same incident infrared radiation.