Infra-red optical systems

Details Infra-red optical systems Infra-red optical systems

1984-07-13

1986-04-22

Arnold, Bruce Y.

Thermal measuring and testing

Temperature measurement

Composite temperature-related paramenter

350588, 374141, 374161, 374191, G02B 2300, G01K 120

Patent

active

045838143

ABSTRACT:
The system relates to a telescope having optics and a scanning head which images a two-dimensional field of view point by point onto a localized thermal sensor. An aperture stop is mounted within the telescope housing and at least part of it is within the field of view of the sensor. The temperature of the stop is controlled by means of Peltier thermo-electric modules so that it corresponds to the average temperature of the external field of view. This prevents halation or blooming which would result from extreme temperature contrasts. The vignetting which occurs when the aperture stop is within the field of view gives an increased magnification for a given size of objective optics, and the benefits outweigh the corresponding reduction in thermal sensitivity.

REFERENCES:
patent: 2963910 (1960-12-01), Astheimer

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