Thermal imager referencing system

Details Thermal imager referencing system Thermal imager referencing system

1996-12-11

1999-01-26

Glick, Edward J.

Radiant energy

Calibration or standardization methods

250332, 250347, G01J 552, G01J 554

Patent

active

058641351

ABSTRACT:
A thermal imager referencing system comprises two rotating cranks in the form of discs (7, 8) each pivotally attached to connecting member (9). The discs (7, 8) are rotated at a constant speed causing two mirrors laterally displaced along connecting member (9) to intercept an optical path X of a thermal imager associated with the referencing system. Each rotation through 360 degrees of the discs (7, 8) causes each mirror to pass once through the optical path, the mirror surfaces being respectively arranged to cause a linear array of detector elements (not shown) of the thermal imager to view alternately thermo-electric devices (14, 16), which are at different temperatures, during the flyback time associated with the thermal imager. The referencing system enables processing means of the thermal imager to normalize the detector array, compensating for DC offset and differences in gain between different elements of the detector array. The referencing system is of a particularly compact design and minimizes the effect of any temperature variations across the surfaces of the Peltier on the normalization process.

REFERENCES:
patent: 4073576 (1978-02-01), Bastian
patent: 4948964 (1990-08-01), Gohlke
patent: 5245190 (1993-09-01), Sibbald et al.
patent: 5604346 (1997-02-01), Hamrelius et al.

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