Quick cooldown/low distortion hybrid focal plane array platform

Details Quick cooldown/low distortion hybrid focal plane array platform Quick cooldown/low distortion hybrid focal plane array platform

1990-12-03

1992-05-05

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

62 511, G01J 506

Patent

active

051110504

ABSTRACT:
A radiation detector assembly (20) includes a radiation detector (2), a silicon readout device (3) coupled to the radiation detector, and a platform 13 for supporting from a first major surface (13a) the readout device and the radiation detector. A second major surface (13b) includes a boss (14) for coupling, via an active brazing operation, to a cryogenic cooler. The platform is monolithic structure comprised of aluminum nitride (AlN) and eliminates at least one adhesive joint found in the prior art. AlN is selected because of its inherent material properties including a higher thermal diffusivity, relative to typical ceramic materials, for providing a reduced cooldown time of the detector to cryogenic temperatures. AlN also has a 300K- 77K thermal contraction characteristic that closely matches that of the silicon readout device and a high modulus of elasticity, thereby reducing distortion of the readout device thus minimizing stresses on indium bump interconnects. AlN also has dielectric characteristics that permit thin film metalization of the surface (13a) for providing electrical signal distribution.

REFERENCES:
patent: 4918312 (1990-04-01), Wellman et al.
patent: 4952810 (1990-08-01), Gustafson et al.
patent: 4956695 (1990-09-01), Robinson et al.
"High Reliability Joining of Ceramic to Metal" American Ceramic Society Bulletin, vol. 68, No. 9, pp. 1591-1599, Sep. 1989 by Mizuhara et al.

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