Measuring and testing – Gas analysis – By vibration
Patent
1973-11-29
1976-02-17
Goldstein, Herbert
Measuring and testing
Gas analysis
By vibration
331 945R, 331DIG1, G01N 2902
Patent
active
039383652
ABSTRACT:
An intense light source, preferably of high monochromaticity, having its beam modulated at a frequency corresponding to an acoustical resonant frequency of a sample chamber energizes the sample chamber along its axis. A photoelectric detector provides a signal related to this modulation for comparison with an acoustical signal provided by a microphone in the sample chamber. Means are provided for adjusting the modulation frequency so that it corresponds to the acoustical resonant frequency of the sample chamber as determined by a maximum in the amplitude of the amplified acoustical signal. An integrator may respond to the amplified acoustical signal to provide an indication of the energy absorbed by the medium in the sample chamber at the light wavelength and thereby the concentration of certain species in the sample chamber.
REFERENCES:
patent: 3700890 (1972-10-01), Kreuzer
patent: 3820901 (1974-06-01), Kreuzer
Kreuzer, Patell, Kenyon, Science, Vol. 177, pp. 347-349, July 28, 1972.
Kreuzer, Patell, Kenyon, Science, Vol. 173, pp. 45-47, July, 1971.
Kreuzer, J. Appl. Phys., Vol, 42, pp. 2934-2943, June, 1971.
Ciarlante Anthony V.
Goldstein Herbert
Hieken Charles
Massachusetts Institute of Technology
Santa Martin M.
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