Infrared detector for NDIR gas analysis

Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen

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374123, 250343, G01J 500

Patent

active

046053131

ABSTRACT:
A detector for a gas analyzer includes a thermal detector, an absorptive film on the surface of said thermal detector, and an enclosure containing a reference gas of the gas species of interest such that the thermal detector is in thermal contact with both the absorptive film and the reference gas. During irradiation, the absorptive film absorbs radiation which passes through the reference gas and causes the thermal detector to generate a corresponding output. When the irradiation is terminated, the heat content of the reference gas, which will be dependent upon the amount of the radiation absorbed, will be communicated to the thermal detector to cause the thermal detector to provide a second output representing the amount of radiation absorbed by the reference gas.

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patent: 4271124 (1981-06-01), Speeter

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