Monitoring process and device of a quasi-closed electromagnetic shield
US5068616A · kind A · utility
17Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1989 |
| Grant date | Nov 26, 1991 |
| Priority date | — |
| Expiry date | Aug 1, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/0835
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An emitter assembly of low-power electromagnetic signals with random or pseudo-random frequency variation is located inside an electromagnetic shield to be monitored. These signals are detected by at least one synchronous detection receiver located outside the shield, a second transmission channel, preferably constituted by an optic fiber, connecting the emitter and receiver assemblies to enable synchronous detection of signals transmitted via an electromagnetic channel through the shield. The amplitude of the electromagnetic signals received by the detector is significant of the quality of the shielding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.