Differential reluctance motion detector
US4083237A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1977 |
| Grant date | Apr 11, 1978 |
| Priority date | — |
| Expiry date | Feb 22, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/086
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A displacement detector yielding an electrical output signal that is linearly proportional to the extent of input motion. The input motion to be monitored is applied to the shiftable armature of a differential reluctance transducer constituted by a pair of transformers, each having a primary, a main secondary and an auxiliary secondary. Fed to the primaries is a high-frequency drive voltage generated by an oscillator whose amplitude is regulated by a feedback loop in which a feedback voltage taken from the auxiliary secondaries is compared with a reference voltage to provide a control voltage that so regulates the drive voltage oscillator as to cancel out the effect of temperature on the output signal derived from the main secondaries.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.