Thermal reference technique for flir sensors

Details Thermal reference technique for flir sensors Thermal reference technique for flir sensors

1993-06-10

1994-08-30

Hannaher, Constantine

Radiant energy

Calibration or standardization methods

250334, G01D 1800

Patent

active

053430409

ABSTRACT:
In a forward looking infrared (FLIR) sensor, a scanning mirror views an external scene, and the infrared energy from the scanning mirror is directed along an optical path to a solid state detector. In the optical path there is a three-position mirror which is driven by an actuator to three predetermined positions. The FLIR sensor also includes two thermal reference sources which are disposed on either side of the optical path and viewable by the three-position mirror. When in a neutral position the three-position mirror reflects the infrared energy from the external scene onto the detector. When the three-position mirror is moved away from the neutral position to two different predetermined positions, the three-position mirror views each of the thermal reference sources and reflects the thermal energy of the thermal reference sources onto the detector in order to provide two reference irradiance levels for the FLIR sensor.

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T. G. Longshaw, "An advance airborne thermal infrared linescanner." The Transactions of the SA Institute of Electrical Engineers (Mar. 1976) pp. 86-92.

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