G - Physics – 01 – N
Patent
G - Physics
01
N
73/113, 73/57
G01N 21/17 (2006.01) G01N 21/37 (2006.01)
Patent
CA 1164248
STABLE INFRARED ANALYZER Abstract of the Disclosure 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.
385492
Evanuik Richard N.
Fertig Glenn H.
Nardozzi Daniel R.
Mine Safety Appliances Company
Sim & Mcburney
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