Method and apparatus for acoustic analysis of binary gas mixture

Measuring and testing – Gas analysis – By vibration

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73611, 331154, G01N 2918

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active

055810144

ABSTRACT:
A method and apparatus for acoustic analysis of binary gas mixtures. A binary gas sample is drawn into a first chamber. A known reference gas is drawn into a second chamber. Acoustic energy is simultaneously transmitted through the respective chambers. Arrival of the first acoustic wave at the receiver of the reference chamber starts a counter that isolates a selected received pulse. The time between receipt of that selected reference pulse and the very next sample pulse is monitored and is transferred to a short term memory and then returned to its initial zero condition. After a quiescent time delay, the sequence is repeated. The resulting signal may be output as data and/or activate alarms if the output does not remain between predetermined upper and lower thresholds, thereby indicating an undesirable binary gas mixture.

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patent: 3852724 (1974-12-01), Schwartz
patent: 4255964 (1981-03-01), Morison
patent: 4281299 (1981-07-01), Newbold
patent: 5060506 (1991-10-01), Douglas
patent: 5060507 (1991-10-01), Urmson et al.

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