Acoustic tool for analysis of a gaseous substance

Details Acoustic tool for analysis of a gaseous substance Acoustic tool for analysis of a gaseous substance

1993-11-29

1996-06-25

Williams, Hezron E.

Measuring and testing

Gas analysis

By vibration

73 3105, 73579, G01N 2922

Patent

active

055289240

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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