Surveillance system
US5412582A · kind A · utility
Inventors
Key dates
| Filing date | Jun 29, 1992 |
| Grant date | May 2, 1995 |
| Priority date | — |
| Expiry date | Jun 29, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L5/243
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to a surveillance system for measuring and surveying e.g. the preload in screws (23) or similar. It comprises a number of sensor systems (1) electrically connected to a common electronic and computing system, each said sensor system (1) comprising sensor means (2) being provided with a magnetoelastic material (6) sensitive to the preloads and a sensing device (3) comprising a coil system at least partly surrounding the sensitive material (6). The sensitive material (6) is excited via the coil system with a frequency of at least 300 kHz so as to make the system insensitive to external disturbing fields.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.