Acoustic tool for analysis of a gaseous substance
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United States of America Patent
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Jun 25, 1996
Grant Date -
N/A
app pub date -
Nov 29, 1993
filing date -
Nov 29, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An acoustic technique is employed to identify the species of a sample of refrigerant gas and whether it contains significant contaminants. The refrigerant is admitted into a Helmholtz resonator under controlled pressure, and a drive frequency is swept across a frequency band and applied to a first transducer. A second transducer picks up the vibrations in the resonator and the output signal is compared to the drive signal. The resonant peak or center frequencies are identified and the sharpness or quality factors are measured. These measured data are compared with stored data to identify the refrigerant.
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