Differential variable reluctance transducer
US5497147A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1993 |
| Grant date | Mar 5, 1996 |
| Priority date | — |
| Expiry date | Jun 21, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2216
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The novel differential variable reluctance transducer and telemetry system is comprised of a ultra miniaturized device encased in stainless steel. The system contains a free sliding, magnetically permeable, stainless core and two coils surrounding the core. The position of the core is detected by measuring the coils' differential reluctance. The coils resonate at a frequency which depends on the position of the core and the difference in resonant frequency is used to modulate a high frequency carrier. This radio frequency signal is transmitted for remote reception by an FM receiver, amplified and put through a phase-locked-loop circuit into a microprocessor for counting and displaying.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.