Thermal-radiation detectors, detection systems and their manufac

Details Thermal-radiation detectors, detection systems and their manufac Thermal-radiation detectors, detection systems and their manufac

1990-06-19

1992-03-24

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250332, 2503383, 250349, G01J 520

Patent

active

050991205

ABSTRACT:
In a thermal-radiation detection system, the thermal radiation (3) incident on a group of pyroelectric and/or ferroelectric infrared detector elements (20) is modulated at a frequency (f). The detector elements (20) are mounted on flexible platform areas of an insulating substrate (10) which may be of an elastic material such as a silicone rubber in, for example, an apertured or recessed mount (18,19). The grooves (15,16) forming the platform areas have a sufficient depth d and width w that the distance (2d+w) is at least as large as the thermal diffusion distance at the modulation frequency (f) so as to reduce thermal cross-talk between the detector elements (20). The elasticity and vibration absorption properties of an elastic substrate (10) and the flexibility and path length increased by the presence of the grooves (15,16) can provide a low microphony mounting arrangement with acoustic decoupling between detector elements (20). Preferably the groove depth d is at least as large as the thermal diffusion distance so as to reduce thermal losses from each detector element (20) and increase the acoustic path length and flexibility of the mounting. The substrate (10) may be molded with the grooves in its face (11), or the grooves may be cut with a saw.

REFERENCES:
patent: 4425502 (1984-01-01), Hall et al.
patent: 4894544 (1990-01-01), Turnbull

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