Patent ID: 11927463
Assignee: NEC CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. A measurement method comprising:
an operation of outputting light to an optical fiber configured to detect a self-excited vibration by a fluid being generated from an object provided in the fluid;
an operation of acquiring backscattered light that is generated from the light in the optical fiber and includes a pattern indicating the vibration in a vibration position on the optical fiber to which the vibration of the fluid is transmitted; and
an operation of measuring, from a pattern that is included in the backscattered light and indicates the vibration, a flow speed of the fluid in the vibration position,
wherein, in the operation of outputting light to the optical fiber, an object configured to generate a self-excited vibration by the fluid is integrated as an optical fiber cable including the optical fiber configured to detect the vibration,
wherein, in the operation of outputting light to the optical fiber, the optical fiber cable is disposed in a plurality of directions, and thus has a plurality of vibration detection sections at different angles formed with a flow of the fluid, and
wherein the operation of measuring a flow speed of the fluid includes performing a comparison analysis on the vibration in each of the vibration detection sections, and also detecting a direction in which the fluid flows, using a comparison result.