Intrusion detection transducers
US4166264A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1977 |
| Grant date | Aug 28, 1979 |
| Priority date | — |
| Expiry date | Dec 27, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/26
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The invention comprises a plurality of intrusion detection transducers connected together wherein each transducer has a central core extending along an axis and having a length along that axis defined as XL where X is an even number of at least two and L is a given length. At least one sensing winding wire is wound around the core to provide a first-hand winding of L/2 length, X-1 number of windings of length L, and a second end winding of L/2 length, each adjacent winding being a reverse polarity to the next adjacent winding. Means are provided to connect each transducer to the adjacent transducers such that the first end of one transducer connects to the second end of the adjacent transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.