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

Claim 0:
1. A measurement system comprising:
an object provided in a fluid, and configured to generate a self-excited vibration by the fluid;
an optical fiber provided in the fluid, and configured to detect the vibration;
a light source configured to output light to the optical fiber;
a detector configured to acquire 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
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 fluid 1 s integrated as an optical fiber cable including the optical fiber configured to detect the vibration,
wherein the optical fiber configured to detect the vibration 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 to also detect a direction in which the fluid flows, using a comparison result.