Measuring and testing – Gas analysis – By vibration
Patent
1984-02-03
1985-12-03
Nozick, Bernard
Measuring and testing
Gas analysis
By vibration
G01N 2902
Patent
active
045559325
ABSTRACT:
Apparatus for assaying the purity of a gas, e.g., helium, includes an acoustic signal generating transducer in a chamber containing the gas under test. In one embodiment, a microphone spaced a given distance from the transducer senses the propagated acoustic signal. A regenerative circuit creates a pulse train of acoustic signals in the chamber having a pulse repetition rate which is a function of the gas purity. In a second embodiment a continuous acoustic signal is propagated in the chamber containing two spaced microphones. The frequency of the acoustic signal is adjusted until the signals received by the microphones are either in phase or 180.degree. out of phase. A peak or null detector detects when the desired phase relationship occurs as the signal frequency is adjusted. The gas purity is then computed from the observed pulse repetition rate or the observed frequency of the in-phase or 180.degree. out-of-phase condition. Temperature compensation is provided for both embodiments.
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Haas George E.
Nozick Bernard
RCA Corporation
Squire William
Tripoli Joseph S.
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