Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1984-08-09
1986-07-01
Church, Craig E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
2502521, 250352, 2504931, G01N 2137
Patent
active
045982015
ABSTRACT:
An infrared fluid analyzer with an improved sensitivity and signal to noise ratio is provided. The device includes a capacitor microphone for detecting absorption by the sample of characteristic infrared wavelength lines, and utilizes an electret material to electrically polarize the capacitive element. Also included are means for controlling the temperature of the infrared radiation source in order to stabilize the output thereof and increase the reliability of the instrument, and means for controlling the temperature of the fluid sample. In a double-beam embodiment of the invention, a gas-free reference cell is provided to further stabilize the instrument.
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M. C. Killion and E. V. Carlson, "A Subminiature Electret-Condenser Microphone of New Design", Journal of the Audio Engineering Society, vol. 22, No. 4 (May 1974) pp. 237-243.
Fertig Glenn H.
Wozniak Robert J.
Church Craig E.
Hannaher Constantine
Mine Safety Appliances Company
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