Stable infrared analyzer

Details Stable infrared analyzer Stable infrared analyzer

1980-09-19

1982-10-19

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

G01N 2126

Patent

active

043552340

ABSTRACT:
A double beam infrared analyzer is modulated to separately and alternately project the sample beam and comparison beam into a condenser microphone type detector thereby generating alternate pulsed signals indicating the intensity of the sample beam and comparison beam. The peak comparison beam signal is detected and maintained at a constant value through a feedback circuit controlling the degree of amplification of both the comparison beam signal and the sample beam signal, thereby providing comparison and sample signals that are corrected every cycle for analyzer instabilities.

REFERENCES:
patent: 2648775 (1953-08-01), Waters
patent: 3731092 (1973-05-01), Freilino
patent: 4008394 (1977-02-01), Risgin et al.
patent: 4013260 (1977-03-01), McClatchie et al.

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