Acoustic tool for analysis of a gaseous substance
US5528924A · kind A · utility
26Cited by
17References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1993 |
| Grant date | Jun 25, 1996 |
| Priority date | — |
| Expiry date | Nov 29, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.