Fluid pressure transducer
US4517842A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1982 |
| Grant date | May 21, 1985 |
| Priority date | — |
| Expiry date | Nov 2, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L11/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fluid pressure transducer of the null balance type in which a fluid whose pressure is being sensed acts against one face of a diaphragm and a balancing control fluid acts against the opposite face. Control fluid pressure is uniformly distributed against the control face of the diaphragm by a porous element, preferably made of a sintered material. Movement or displacement of the diaphragm opens a sensing element and may be controlled by use of a similar pressure distributing porous element placed on the sensing side. The volume defined between the two porous elements limits maximum diaphragm travel and displacement. Transducers made according to the invention have high sensitivity. The transducers are particularly well adapted for measurement of pore pressure in earth fills or natural geological environments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.