Filter system for infrared analysis

Details Filter system for infrared analysis Filter system for infrared analysis

1975-10-14

1976-07-06

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250343, G01J 100

Patent

active

039683672

ABSTRACT:
An improved filtering technique in the detection by infrared absorption of a weak infrared absorbing gas in the presence of a strong infrared absorbing gas in a common sample involves providing a bandpass filter having a passband centered on a strong absorption line of the weak absorbing gas of interest to enhance the absorption due to the presence of that gas in the sample and providing a bandpass filter having a passband offset from any strong absorption line associated with the strong infrared radiation absorbing gas of interest to thereby decrease and linearize the amount of absorption caused by the presence of that gas of interest in the sample.

REFERENCES:
patent: 2674696 (1954-04-01), Smith et al.
patent: 2999929 (1961-09-01), Martin et al.
patent: 3014129 (1961-12-01), Martin
patent: 3435209 (1969-03-01), Keahl
patent: 3488491 (1970-01-01), Schuman
patent: 3539804 (1970-11-01), Billetdeau

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