Method and apparatus for temperature compensation of magnetostrictive position detection
US5406200A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1993 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Feb 18, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/2963
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a position detection probe having a magnetostrictive wire stretched between a head and a reflective foot end termination, and a magnet displaceable along the probe and using the sonic pulse propagation time from the magnet to the foot end termination as a position detection parameter, compensation for thermal expansion and thermal change of propagation velocity is made by measuring the wire resistance and calculating a compensation from the resistance. The probe is excited by an electrical pulse having a known current. The voltage across the wire is measured at a time when the current has stabilized to a precise value, and resistance is determined from the current and voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.