Strain gauge pressure transducer
US4385525A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1981 |
| Grant date | May 31, 1983 |
| Priority date | — |
| Expiry date | Sep 18, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/045
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A strain gauge pressure transducer comprising a housing having an internal pressure cavity across which is mounted a flexible elastomeric diaphragm that separates high and low pressure chambers in the gauge that the housing is arranged to separately connect the sources of high and low pressure, respectively. A range spring in the form of a leaf spring is anchored to the housing cantilever fashion in the high pressure chamber and to one side of the diaphragm to dispose the live length of same, as defined by a clamp device, in overlying relation to the diaphragm, to which the leaf spring live length is connected for deflecting movement thereof by the diaphragm. The leaf spring has fixed to its live length a strain gauge in the form of four square grid etched foil sensing elements of the self temperature compensated type connected in Wheatstone bridge fashion that forms an electro-mechanical transducer that is powered by an electronic circuit mounted inside the gauge on a printed circuit board that is in overlying relation to and spaced from the leaf spring, which when energized supplies a constant direct voltage, to the strain gauge. Deflection of the leaf spring live length under de…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.