Measuring and testing – Gas analysis – By vibration
Patent
1982-09-17
1984-07-03
Goldberg, Gerald
Measuring and testing
Gas analysis
By vibration
G01N 2117
Patent
active
044571623
ABSTRACT:
An apparatus and process for detecting a single specific chemical solid or gas in the presence of other chemical solids or gases or for detecting a number of specific mixed chemical solids or gases. The apparatus and process passes multiple beams of electromagnetic radiation incident on the material in a sample chamber producing acoustic signals at specific frequencies when light of specific wavelengths is absorbed. The electromagnetic radiation is selected to have wavelengths corresponding to optical absorption features of at least one specific chemical in the sample chamber. The acoustic signals are detected by at least one beat tone or combination tone characteristic of and representative of the degree of absorption by a specific chemical or multiple specific chemicals desired to be detected. The apparatus and process are especially useful in leak detection in natural gas systems and for detection of pollutants, explosive gases and the like.
REFERENCES:
patent: 3938365 (1976-02-01), Dewey, Jr.
patent: 3948345 (1976-04-01), Rosencwaig
patent: 4176963 (1979-12-01), Fabinski
Nitric Oxide Air Pollution: Detection by Optoacoustic Spectroscopy, Kreuzer, Patel, Science, vol. 173, pp. 45-47.
Huebler James E.
Rush William F.
Goldberg Gerald
Institute of Gas Technology
Kovalick Vince
Speckman Thomas W.
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