Inductive linear displacement transducer and temperature-compensating signal processor
US5115193A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1990 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Dec 5, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D3/0365
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A transducer system is provided including an inductive linear displacement transducer connected to a temperature-compensating signal processor. The signal processor includes (a) an amplitude-variable, frequency-stable device providing a modulated D.C. current through the transducer, (b) a temperature-sensitive element connected in series between the transducer and the current-providing device such that it is subjected to substantially the same temperature as the transducer, and (c) a signal processing circuit coupled to the temperature-sensitive element. The temperature-sensitive element has a high temperature coefficient so that temperature changes have a substantial effect on the DC offset of the signal coming from the temperature-sensitive element, and a low dynamic resistance so that temperature changes have substantially no effect on the amplitude of the signal coming from the temperature-sensitive element. The signal processing circuit (1) detects changes in the DC offset of the signal coming from the temperature-sensitive element and generates a signal used as the input to the current-providing device to adjust the amplitude of the modulation of the current in compensation f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.