Ultra sensitive liquid level detector and method
US4329875A · kind A · utility
27Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1980 |
| Grant date | May 18, 1982 |
| Priority date | — |
| Expiry date | Mar 31, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/2966
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A highly sensitive liquid level detection system. It employs a piezoelectric transducer that has a natural frequency of vibration which effectively varies depending upon the amount that the transducer is immersed in a liquid. An emf is applied to the transducer to cause it to vibrate at the effective natural frequency, and the exact frequency is counted which count indicates the amount of immersion with a high degree of accuracy. A printer may be employed to periodically record the frequency count.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.