Measurement system, measurement device, and measurement method to detect a direction in which fluid flows

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.

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.