Acoustical volume/pressure measurement device
US4704902A · kind A · utility
Inventor
Key dates
| Filing date | Jul 10, 1986 |
| Grant date | Nov 10, 1987 |
| Priority date | — |
| Expiry date | Jul 10, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F17/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The apparatus consists of a mechanical acoustical driver producing sound vibrations in a fluid, such as a liquid or gas, within an enclosed space. A pickup transducer positioned within the tank measures the sound vibrations of the gas within the tank and transmits the same to an amplifier and a low pass filter. Either the same or another transducer positioned in the tank measures static pressure P output of which is amplified. A divider circuit receives the dynamic pressure signal and static pressure signal and provides electrical signal E proportional to (.DELTA.P/P). A differential amplifier receives the reference signal Erf and the signal E and supplies the error signal (Erf-E) to a gain controlled amplifier. The gain controlled amplifier amplifies the AC signal proportional to (Erf-E). The driver generates .DELTA.P in the tank proportional to the output of the gain controlled amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.