Fiber bragg grating hydrophone comprising a diaphragm amplifier
US8687927B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 2010 |
| Grant date | Apr 1, 2014 |
| Priority date | — |
| Expiry date | Oct 3, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/186
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fiber Bragg grating hydrophone includes a fluid chamber (1) and an optical fiber (2) in which a Bragg grating (3) is integrated, the optical fiber extending through the fluid chamber such that the Bragg grating is positioned inside the latter. The fluid chamber is filled with a compressible fluid and is defined by a rigid casing (4) including two end surfaces (28a, 28b) that are rigidly connected to the optical fiber. At least one of the two end surfaces of the rigid casing includes an opening (5a, 5b) closed by a deformable diaphragm (6a, 6b) that is rigidly connected to the optical fiber and that can be deformed in reaction to a difference in the pressures applied to the surfaces thereof, thereby modifying the length of the optical fiber as measured by a variation in the wavelength of a luminous flux extracted from the optical fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.