Magnetostrictive stress sensor and apparatus applying same
US5850045A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1995 |
| Grant date | Dec 15, 1998 |
| Priority date | — |
| Expiry date | Jun 26, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L3/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Wiring patterns 50, 60 are formed in zigzag fashion on respective ones of both sides of a flexible insulating sheet 70. The wiring patterns 50, 60 include linear portions 50C, 60C and arcuate portions 50A, 60A, respectively. The linear portions 50C and the linear portions 60C overlap. The arcuate portion 60A is situated between two arcuate portions 50A that neighbor each other. One end of each of the wiring patterns 50, 60 is connected to a detection circuit 75 which detects a change in inductance. The other ends of the wiring patterns 50, 60 are connected together through a through-hole 70A. The sheet 70 is disposed in such a manner that the linear portions 50C, 60C will perpendicularly intersect the direction of stress, which is to be measured, acting upon a member 80 undergoing measurement. The sheet 70 and the wiring patterns 50, 60 construct a detection coil 71. An AC excitation current flows through the detection coil 71. When stress is applied to the member 80 undergoing measurement, the permeability of the member changes and so does the inductance of the detection coil 71.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.