Title:
監視用湿度計測システムおよび監視用湿度計測方法
Document Type and Number:
Japanese Patent JP7177991
Kind Code:
B2
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.
Inventors:
Masanori Nakamichi
Nakao Issei
Kinmasu Kishida
Nakao Issei
Kinmasu Kishida
Application Number:
JP2019159253A
Publication Date:
November 25, 2022
Filing Date:
September 02, 2019
Export Citation:
Assignee:
School corporation Kanai Gakuen
Neubrex Co., Ltd.
Neubrex Co., Ltd.
International Classes:
G01N19/10; G01D5/353
Domestic Patent References:
| JP4027853A | ||||
| JP1210891A | ||||
| JP9089714A |
Foreign References:
| WO2010061718A1 | ||||
| WO2017212559A1 | ||||
| US20120086443 | ||||
| WO2011111178A1 |
Attorney, Agent or Firm:
Masuo Oiwa
Kenji Yoshizawa
Kenji Yoshizawa
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