Method for measuring volumetric changes of object
US9360304B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 10, 2012 |
| Grant date | Jun 7, 2016 |
| Priority date | — |
| Expiry date | Aug 10, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B21/042
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Under a known pressure is externally applied to a reference member to which an optical fiber is fixed, test light is allowed to enter the optical fiber, and at least one of a reference Brillouin measurement for determining a reference Brillouin frequency shift amount based on the Brillouin scattering phenomenon, and a reference Rayleigh measurement for determining a reference Rayleigh frequency shift amount based on the Rayleigh scattering phenomenon is performed. A Brillouin measurement coefficient or a Rayleigh measurement coefficient is determined from these calculation results. An optical fiber is fixed to a sample member, the volumetric change of which is unknown, and the same sample Brillouin measurement or sample Rayleigh measurement is performed to determine the frequency shift amount. The volumetric change of the sample member is determined from the sample Brillouin or the sample Rayleigh frequency shift amount, and from the Brillouin or the Rayleigh measurement coefficient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.