Solid state non-dispersive IR analyzer using electrical current-modulated microsources
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United States of America Patent
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Feb 6, 1990
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N/A
app pub date -
Oct 21, 1987
filing date -
Oct 21, 1987
priority date (Note) -
Expired
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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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