Pneumatic infrared radiation detector having a hermetically seal

Details Pneumatic infrared radiation detector having a hermetically seal Pneumatic infrared radiation detector having a hermetically seal

1978-05-02

1980-05-06

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

313110, G01J 100

Patent

active

042019150

ABSTRACT:
A pneumatic infrared radiation detector for intermittent irradiation with infrared light has a hermetically sealed chamber including a metal cup having a highly reflective inner surface forming the back of the chamber and a flange-like rim at the open end thereof. A radiation admitting window is disposed at the open end of the cup and a flow detector is connected to the chamber. The cup comprises a thin-walled noble metal vessel comprising one of gold and silver and the window is composed of at least one of calcium fluoride and barium fluoride and sealed vacuum tight to the cup with glass solder having a coefficient of expansion of between 110 and 150. 10.sup.-7 /K.

REFERENCES:
patent: 3781910 (1973-12-01), Herrmann
patent: 3904880 (1975-09-01), Benz et al.
patent: 4154087 (1979-05-01), Schunk et al.
Turnbull, M.S. "Non-Dispersive Infra-Red Gas Analysers" Electronics and Instrumentation (Mar. 1972) vol. 2, No. 12, pp. 11-15.

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