Measuring and testing – Gas analysis – By vibration
Patent
1979-03-20
1981-01-27
Kreitman, Stephen A.
Measuring and testing
Gas analysis
By vibration
G01N 2902
Patent
active
042467730
ABSTRACT:
The present invention relates to apparatus for measuring calorific value and Wobbe index of gas by determining the specific gravity of the gas, and apparatus for controlling the calorific value of the gas in accordance with the specific gravity. The specific gravity of the gas is related to the sonic speed in the gas which is determined by means of electric equipment. The electric equipment contains a pair of acoustic tubes, in one of which is contained gas being measured, and in the other of which is contained standard gas. Each of the acoustic tubes is provided at opposite ends thereof with a microphone and a speaker, and a pair of amplifiers, one each associated with a respective microphone and speaker. Howling occurs in each acoustic tube. Consequently a signal having a beat frequency is obtained by mixing and detecting the outputs from the amplifiers, and the beat frequency is representative of the specific gravity of the gas being measured.
REFERENCES:
patent: 2952153 (1960-09-01), Robinson
patent: 3381520 (1968-05-01), Bourquard et al.
patent: 3789655 (1974-02-01), Passeri
patent: 3848457 (1974-11-01), Behymer
"Experimental Method of Natural Gas," Toru Ogawa, pp. 124-126, Aug. 10, 1945.
Kreitman Stephen A.
Osaka Gas Company Ltd.
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