Laser warning sensor with frequency-coded position information
US5025148A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1989 |
| Grant date | Jun 18, 1991 |
| Priority date | — |
| Expiry date | Oct 4, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/4818
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A laser warning sensor having a directional resolution capability based on a pulse frequency encoding of the directions at which laser light beams are received, is equipped with a plurality of light signal delay units. The directional or angular information is encoded by closed loop fiberglass light conductors, one of which is part of each light signal delay unit, each closed loop has a different length so that the respective signal delay signifies the respective directional information. The closed loop light conductors transform received light pulse signals into pulse sequences or pulse trains each having a given frequency. The respective frequencies are separated by filters in an electronic evaluating circuit which receives its input signals from a photodiode which receives the output light signals from all delay units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.