Scattered light measuring device
US7907285B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2006 |
| Grant date | Mar 15, 2011 |
| Priority date | — |
| Expiry date | Sep 17, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/3172
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Measurement of Brillouin scattered light is enabled without an optical receiver having a wide reception band. A scattered light measuring device includes a continuous wave light source that generates continuous wave light, an optical pulse generator that converts the continuous wave light into pulsed light, an optical frequency shifter that receives the continuous wave light, and outputs shifted light including the continuous wave light, first sideband light having an optical frequency higher than an optical frequency F0 of the continuous wave light by a predetermined optical frequency Flo, and second sideband light having an optical frequency lower than the optical frequency F0 of the continuous wave light by the predetermined optical frequency Flo, a power reducing unit that reduces the power of the continuous wave light in the shifted light output by said optical frequency shifter, and a heterodyne optical receiver that receives scattered light from an incident end of an optical fiber which the pulsed light enters, further receives the shifted light from said optical frequency shifter, and outputs an electric signal having a frequency which is a difference between the optical fr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.