Patent ID: 6300623
Filing Date: 2001-10-09
Classification: G01J

Abstract:
An Infra Red (IR) sensing device comprising:an IR sensor for detecting IR radiation, wherein the IR sensor generates electrical signals in response to and indicative of any IR radiation detected by the IR sensor;an IR opaque enclosure surrounding the IR sensor, the enclosure having an IR transparent window positioned to allow IR radiation from outside the enclosure to fall on the IR sensor;a mirror element, external to the enclosure, for reflecting IR radiation;an IR radiator located within the enclosure, wherein the IR radiator emits IR radiation, wherein at least a portion of a first IR radiation signal emitted by the IR radiator is reflected by the mirror element onto the IR sensor, wherein the reflected IR radiation signal is detected by the IR sensor, and wherein the IR sensor generates a first electric signal proportional to the detected IR radiation signal; anda processor coupled to the IR sensor for analyzing electric signals generated by the IR sensor, wherein the processor receives and analyzes the first electric signal to determine characteristics of the detected IR radiation signal.