Method and apparatus for the detection and measurement of gases

Details Method and apparatus for the detection and measurement of gases Method and apparatus for the detection and measurement of gases

1985-03-21

1986-11-18

Kreitman, Stephen A.

Measuring and testing

Gas analysis

By vibration

G01N 2100

Patent

active

046228454

ABSTRACT:
The invention provides an apparatus for the detection of a selected species in a gas sample and includes a photo-acoustic detector coupled to an infrared radiation source with an acousto-optic tunable filter disposed between the source of infrared radiation and photo-acoustic detector. This combination is capable of measuring concentrations of controlled vapors in the parts-per-million range. These measurements may be performed in a few seconds via the portable gas detection and measurement device of this invention.

REFERENCES:
patent: 3948345 (1976-04-01), Rosencwaig
L. B. Kreuzer, "Ultralow Gas Concentration Infrared Absorption Spectroscopy", Journal of Applied Physics, vol. 42, No. 7, pp. 2934-2943, Jun. 1971.
"Nitric Oxide Air Pollution: Detection by Optoacoustic Spectroscopy", Science, vol. 173, pp. 45-46, Jul. 1971.

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