Monitoring humidity measurement system and monitoring humidity measurement method
US11280643B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 2020 |
| Grant date | Mar 22, 2022 |
| Priority date | — |
| Expiry date | Oct 7, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K11/322
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A monitoring humidity measurement system includes: a humidity measurement optical fiber including a first optical fiber and a humidity detection layer provided so as to annularly cover the first optical fiber; a reference optical fiber including a second optical fiber; a plurality of optical communication cables; and a signal processing device configured to, with a laser beam entering into the first and second optical fibers, calculate and obtain Brillouin frequency shift and Rayleigh frequency shift of backscatter light from the first and second optical fibers based on the entering laser beam, and store predetermined constants, wherein reference data and target data are measured from the Rayleigh frequency shift and an initial humidity value calculated from the Brillouin frequency shift, and the value of humidity at the present time is calculated on the basis of Rayleigh frequency shift per unit humidity calculated from a difference between the above two data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.