Position sensing head with redundancy
US8692541B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Oct 5, 2011 |
| Grant date | Apr 8, 2014 |
| Priority date | — |
| Expiry date | May 18, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2291
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A position sensing head combines a sensing element and a simplified electronic module to enable operation with one wire, in addition to a circuit common, for providing power and transmitting a signal, while separating the sensing head from signal conditioning circuits by over 10 meters. The simplicity of the electronic module allows the use of basic electronic components that operate at more than 225° C. The signal is a variable frequency impressed onto the one wire, which can be read by a frequency meter. Another signal, such as a position or temperature, can be impressed onto the one wire at the same time as the first signal. The second signal is of a different frequency range so that it will not interfere with the first. A demodulator circuit can separate the two signals. The sensing element construction allows for locating up to three active elements measuring the same target.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.