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

Claim 3:
4. A measurement device comprising:
a detector configured to acquire backscattered light that is generated from light being output to an optical fiber configured to detect a self-excited vibration by a fluid being generated from an object provided in the fluid and that includes a pattern indicating the vibration in a vibration position on the optical fiber to which the vibration of the fluid is transmitted; and
a calculator configured to measure, 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 an object configured to generate a self-excited vibration by the 1 s integrated as an optical fiber cable including the optical fiber configured to detect the vibration,
wherein 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 calculator is configured to perform a comparison analysis on the vibration in each of the vibration detection sections, and also detects a direction in which the fluid flows, using a comparison result.