Solid state non-dispersive IR analyzer using electrical current-

Details Solid state non-dispersive IR analyzer using electrical current- Solid state non-dispersive IR analyzer using electrical current-

1987-10-21

1990-02-06

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250573, 356437, G01N 2131, G01N 2135

Patent

active

048990531

ABSTRACT:
A non-dispersive infrared gas analyzer of the type typically used to measure concentrations of gases in medical and industrial applications has no moving parts and employs two or more miniature infrared sources ("microsources") which are electrical current-modulated to produce modulated infrared radiation for synchronous detection. The microsources are operated at different frequencies. The frequency-multiplexed detector signal is demodulated and ratioed to yield an output which is correlated to the gas concentration in the sampler chamber.

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