Patent ID: 11965758
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A Brillouin optical sensing device comprising:
a sensing fiber in which a plurality of optical fibers having Brillouin frequency shift characteristics different from each other are arranged in parallel;
an optical measuring instrument that launches an optical pulse into at least two of the optical fibers of the sensing fiber to generate Brillouin scattering lights and measures a beat frequency of one beat signal obtained from between the Brillouin scattering lights at any position of the sensing fiber; and
an arithmetic processing unit that acquires a physical quantity, that is one of temperature change, strain change and curvature change, of the sensing fiber at said any position based on the beat frequency of the one beat signal acquired by the optical measuring instrument.