Inductive differential pressure sensor
US4665753A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 23, 1984 |
| Grant date | May 19, 1987 |
| Priority date | — |
| Expiry date | Nov 23, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/007
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A measuring diaphragm (1) separates in a pressure-tight manner two half chambers (9, 10) suitable for being respectively subjected to two pressures to be compared. In a central zone of the diaphragm (1) there are two magnetic cores (118, 127) which are disposed on opposite sides of the diaphragm in respective ones of the half chambers and which are displaced with the diaphragm when the faces of the diaphragm are subjected to different pressures. The cores are movable inside respective simple inductors (132, 133 ), thereby varying their impedances. By measuring this impedance variation it is possible to determine the position of the cores in the associated inductors, and consequently to establish the difference between the pressures being applied to respective faces of the measuring diaphragm (1). The above arrangement provides for automatic zero correction in an inductive differential pressure sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.