Apparatus and method for comparing corresponding acoustic resonances in liquids
US5886262A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1994 |
| Grant date | Mar 23, 1999 |
| Priority date | — |
| Expiry date | Mar 25, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0222
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus and method for comparing corresponding acoustic resonances in liquids. The present invention permits the measurement of certain characteristics of liquids which affect the speed of sound therein. For example, a direct correlation between the octane rating of gasoline and the speed of sound in a gasoline sample has been experimentally observed. Therefore, changes in the speed of sound therein can be utilized as a sensitive parameter for determining changes in composition of a liquid sample. The present apparatus establishes interference patterns inside of a liquid without requiring the use of very thin, rigorously parallel ceramic discs, but rather uses readily available piezoelectric transducers attached to the outside surface of the usual container for the liquid and located on the same side thereof in the vicinity of one another. That is, various receptacle geometries may be employed, and the driving and receiving transducers may be located on the same side of the receptacle. The cell may also be constructed of any material that is inert to the liquid under investigation. A single-transducer embodiment, where the same transducer provides the excitation to the sample con…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.