Acoustic mode propagation speed measurement method and acoustic mode propagation speed measurement device
US11815421B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 2020 |
| Grant date | Nov 14, 2023 |
| Priority date | — |
| Expiry date | Jul 12, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/319
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An objective is to provide an acoustic mode propagation speed measurement method and an acoustic mode propagation speed measurement device capable of measuring a propagation speed of an acoustic mode without cutting or processing an optical fiber wire.According to the present invention, an acoustic mode propagation speed measurement method includes: acquiring a frequency shift spectrum of Brillouin scattered light generated in an optical fiber; fitting the frequency shift spectrum using a Gauss function; acquiring a spectral full-width at half maximum w from a fitted curve using the Gauss function; and calculating a propagation speed VA of an acoustic mode of the optical fiber by substituting the acquired spectral full-width at half maximum w into a linear function of the spectral full-width at half maximum w and the propagation speed VA of the acoustic mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.