Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1989-08-23
1990-08-28
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
62 511, 228221, G01J 506
Patent
active
049528106
ABSTRACT:
An infrared detector assembly (10) of the type used in munitions and night vision systems having an improved coldfinger assembly (42). Such detector assemblies (10) include a tubular coldfinger (22) which is surrounded by a vacuum and an end-cap (28) mounted to the coldfinger tube (22) to define a cold end (24) which supports the infrared detector array (30) and related components. In accordance with this invention, the coldfinger tube (22) is a thin-walled titanium cylinder and the end-cap (28) is made of tungsten. The components are metallurgically bonded at the cold end (24) by an active brazing alloy deposited during vacuum furnace brazing. The titanium coldfinger (22) provides the necessary bending stiffness to support cold end components. The tungsten end-cap (28) provides a low distortion, thermally stable focal-plane. The metallurgical bond (46) provides for a hermetic seal which inhibits structural distortion during brazing, and during cyclical cooling of the detector assembly (10).
REFERENCES:
patent: 3570110 (1971-03-01), Zdanuk
patent: 3719990 (1973-03-01), Long et al.
patent: 3851173 (1974-11-01), Taylor et al.
patent: 4190106 (1980-02-01), Dunmire
patent: 4528449 (1985-07-01), Gordon et al.
Gustafson Kenneth L.
Maassen Nevil Q.
Romano Timothy S.
Salzer Donald E.
Denson-Low W. K.
Fields Carolyn E.
Santa Barbara Research Center
Schubert W. C.
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