Vibration distribution measuring system, vibration waveform analysis method, vibration waveform analyzing device, and analyzing program
US11920974B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 2019 |
| Grant date | Mar 5, 2024 |
| Priority date | — |
| Expiry date | Feb 24, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/353
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A vibration distribution measurement system includes a frequency sweep light source that outputs frequency sweep light, an optical splitter that splits the frequency sweep light into probe light and local light, an optical mixer that mixes backscattered light from the sensing fiber as signal light with the local light, the backscattered light being obtained by causing the probe light to be incident on the sensing fiber, and an analysis unit that analyzes a beat signal obtained from output light of the optical mixer. The analysis unit estimates a distance offset from a measurement result obtained by measuring a distribution waveform of the signal light by measuring the beat signal at a measurement time sufficiently shorter than a cycle of the vibration of the sensing fiber, and measures a distribution of a vibration at any position by compensating for the distance offset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.