Independent-excitation cross-coupled differential-pressure transducer
US6581468B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 2001 |
| Grant date | Jun 24, 2003 |
| Priority date | — |
| Expiry date | Mar 22, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L15/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a differential-pressure transducer having two sensors cross-coupled and independently excited. A first Wheatstone Bridge pressure sensor has a first sensitivity and is excited by a first voltage. A second Wheatstone Bridge pressure sensor has a second sensitivity and is independently excited by a second voltage different from said first voltage. The excitation voltages are independently adjusted to increase or decrease the sensitivities of the sensors to substantially match. The outputs of the sensors are cross-coupled to each other to reduce the offset difference errors between the pressure sensors. Sensitive electronics are isolated within the sealed housing to protect them from harsh surrounding media. The transducer is configured to provide either a four pressure differential pressure measurement or a three pressure gauge differential pressure measurement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.