Single terminal detection system
US4224608A · kind A · utility
23Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1978 |
| Grant date | Sep 23, 1980 |
| Priority date | — |
| Expiry date | Nov 13, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/184
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A single terminal detection system of the beam variety is provided with polarizing filters to sense "near-field" problems. One filter polarizes radiation reflected back to the transceiver component and a second filter, positioned within the transceiver, polarizes radiation before it is incident upon one of two radiation detectors. Circuitry, operatively coupled to the detectors, actuates an alarm in the event either an alarm condition or a near-field problem exists.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.