Temperature compensated resonant transmission line sensor
US7373272B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 2006 |
| Grant date | May 13, 2008 |
| Priority date | — |
| Expiry date | Nov 10, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K7/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A position sensing system uses a resonant transmission line having a moveable dielectric as a position sensor. The system includes circuitry that supplies an RF drive signal to the resonant transmission line, which reflects the drive signal. Based on a standing wave signal, which is generated from the drive signal and the reflected drive signal, the circuitry determines the frequency of the RF sensor drive signal relative to a resonant frequency of the resonant transmission line, and adjusts the RF sensor drive signal frequency to match a resonant frequency of the transmission line. The system additionally includes integral circuitry that senses the temperature of the resonant transmission line and supplies a temperature signal representative thereof. The circuitry determines the relative position of the moveable dielectric based on the adjusted RF sensor drive signal frequency, and supplies a temperature compensated position signal representative thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.