Radiation shield for thermoelectrically cooled infrared detector

Details Radiation shield for thermoelectrically cooled infrared detector Radiation shield for thermoelectrically cooled infrared detector

1989-06-23

1991-02-05

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250353, 25037015, 350276SL, G01J 508

Patent

active

049907824

ABSTRACT:
A radiation shield 40 is mounted to an uncooled portion, such as an outer case 14, of an IR detector assembly 10 such that it surrounds a thermoelectric cooler 16 and a radiation detector 18. The shield 40 has a curved reflective upper surface 42 having the shape of a toric segment and cylindrical or rectangular reflective sidewalls 44 for imaging the detector 18 and the upper cooler stage upon the tops and sides of lower and slightly warmer cooler stages, which absorb and eliminate radiative energy. This beneficially reduces the heat load upon the coldest stage by excluding hotter surfaces from its view, and by inhibiting reflective couplings of unwanted energy admitted by aperture 46. An aperture 46 defines the effective coldstop for the detector 18.

REFERENCES:
patent: 2738700 (1956-03-01), Taylor
patent: 3445659 (1969-05-01), Guimento et al.
patent: 3648056 (1972-03-01), Buttweiler et al.
patent: 4217026 (1980-08-01), Radovich
patent: 4339748 (1982-07-01), Guscott et al.
patent: 4431917 (1984-02-01), Gibbons
patent: 4507551 (1985-03-01), Howard et al.
patent: 4542963 (1985-09-01), Linlor
patent: 4820923 (1989-04-01), Wellman

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