Flow velocity measuring system and method thereof based on distributed optical fiber temperature sensor technology

Abstract

The invention discloses a flow velocity measuring system and a method thereof based on distributed optical fiber temperature sensor technology, relating to the technology of flow velocity measurement. The structure of the system is that: a sensor optical fiber (20) is arranged in fluid (00), a heating device (30), the sensor optical fiber (20), a distributed optical fiber temperature measuring instrument (10) and a flow velocity calculating device (40) are sequentially connected from back to forth; the flow velocity is tested by the heating device (30) and the sensor optical fiber (20), the flow velocity is converted into temperature value by the distributed optical fiber temperature measuring instrument (10), and the temperature value is converted into the flow velocity by the flow velocity calculating device (40). The system and the method thereof can effectively and rapidly measure the flow field of the fluid, and can carry out real-time monitoring to the flow field of the fluid; the monitoring is simple and convenient and can meet various measuring requirements; the system and the method thereof are suitable for measurement of flow velocity of the various fluids and are particularly suitable for measurement of flow velocity of large-volume fluids at different positions.

Description

technical field [0001] The invention relates to a flow velocity measurement technology, in particular to a flow velocity measurement system and method based on distributed optical fiber temperature sensing technology. Background technique [0002] Velocity measurement is a crucial test item in hydraulic test research and engineering practice. At present, there are 5 methods that are used more: Pitot tube velocity measurement method, micro propeller velocity measurement method, hot wire velocity measurement method, laser measurement method and particle image velocity measurement method. [0003] 1. Pitot tube velocity measurement method [0004] Using the classical Pitot tube flow velocity measuring instrument, the measurement method is relatively simple, but it can only be used for average velocity measurement or flow measurement, and the measurement accuracy is not high. [0005] 2. Miniature propeller velocity measurement method [0006] The miniature propeller-type cur...

AI Technical Summary

Problems solved by technology

[0012] The particle image velocimetry system does not destroy the flow field when measuring, and can measure the flow velocity and direction of a large area in a short time, with high accuracy, so it has been widely used in recent years; The field is a surface flow field, and the change of luminosity during the measurement process and the water-dependent nature of the particles will also affect the measurement effect

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