Displacement sensor
US7521921B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2005 |
| Grant date | Apr 21, 2009 |
| Priority date | — |
| Expiry date | Nov 9, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Sensors and methods for measuring displacement are disclosed. In one embodiment, among others, a resistive element is configured to receive an alternating voltage between a first electrical terminal and a second electrical terminal, the first and second electrical terminals defining a length of the resistive element. A signal pickup is capacitively coupled to the resistive element and is configured to be moved along the length of the resistive element at a substantially fixed distance from the resistive element and without contact between the resistive element and the signal pickup. A shielded cable, such as a coaxial cable, electrically connected to the signal pickup carries a signal having an amplitude proportional to the position of the signal pickup with respect to the first and second electrical terminals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.