Inductive transducer with calibrating balancing core for measuring movement of an object
US5117181A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1990 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Dec 12, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/48
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention makes it possible to detect and measure the movement of a moving member (50) through an amagnetic or low permeability metal wall. The installation requires ferromagnetic material targets placed at regular intervals over the moving member. The transducer is positioned facing the moving member by its detection face (16). It comprises two ferromagnetic cores (2, 8) surrounded both by an exciting coil (4) and a measuring coil (10), at whose terminals the measuring signal is taken. The latter is proportional to the variable reluctance of the magnetic circuit, which varies as a function of the position of the ferromagnetic targets (48). The transducer is completed by a balancing core (34). Application to the measurement of the displacement of control rods in the vessel of a pressurized water reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.