Sensor array for perimeter defense
US7526147B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 2005 |
| Grant date | Apr 28, 2009 |
| Priority date | — |
| Expiry date | May 4, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/35383
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An intensity modulated broadband optical signal source is arranged to produce optical signals in a plurality of wavelength bands. A demultiplexer/multiplexer pair receives optical signals from the optical signal source and produces a separate optical signal for each wavelength band. An optical coupler is arranged to receive the separate optical signals. Optical fiber loops connected to the optical coupler guides both clockwise and counter clockwise waves for each of the separate optical signals. The optical signals propagate through a sensor in each loop and then combine in the optical coupler to form a plurality of interference signals in each wavelength band. A multiplexer is optically coupled to the optical coupler to receive the interference signals therefrom, and a detector array having a selected detector corresponding to the each of the plurality of wavelength bands is arranged to provide an electrical signal that indicates the interference signals for each wavelength band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.