Optical fiber sensor for monitoring flow velocity of fluid in pipeline

Abstract

The invention provides an optical fiber sensor for monitoring the flow velocity of fluid in a pipeline, and belongs to the technical field of measurement. The optical fiber sensor for monitoring the flow velocity of the fluid in the pipeline comprises an optical fiber, an optical fiber protection armor, an optical fiber fixing hoop, a metal cushion block, a ceramic rod piece, a ceramic sheet, a spring top seat, a spring, a spring base, a reflecting mirror surface, a hollow cylinder, a ceramic shell, a ceramic ring and a bearing. The device realizes real-time monitoring of the flow velocity of the fluid in the pipeline by observing the change of the spectrum in the spectrograph and applying the Fabry-Perot optical fiber interference principle, the principle that the force generated when the fluid flows through the sensor is equivalent to the internal force generated by the spring and the relationship between the fluid resistance and the relative velocity, thereby ensuring the safety and stability of pipeline transportation. The device is low in labor cost, easy to operate and wide in coverage range, and has wide application prospects and popularization markets.

Description

technical field [0001] The invention relates to an optical fiber sensor for monitoring the flow velocity of pipeline fluid, which belongs to the technical field of measurement. Background technique [0002] Pipeline transportation is one of the five major transportation industries alongside railways, highways, waterways and aviation, and plays an important role in my country's economic development. In an international environment where energy is scarce, international oil and gas trade has effectively improved energy utilization. Pipeline flow measurement is the key to oil and gas trade, and accurate measurement can reduce trade disputes. Therefore, it is very necessary to monitor the pipeline fluid flow and velocity. The medium transported by the pipeline is mainly kerosene, oil and natural gas. The fiber optic sensor has the advantages of corrosion resistance, high sensitivity, and real-time monitoring. It can be used to monitor the flow rate of pipeline fluid. [0003] ...

AI Technical Summary

Problems solved by technology

Among them, the pitot tube velocimetry technology obtains the fluid velocity of the cross-section of the pipeline by measuring the linear velocity at a certain point; the hot wire velocimetry technology measures the flow velocity according to the temperature difference; the laser Doppler velocimetry technology measures the Doppler of the laser probe tracer particles. The fluid velocity is obtained from the Le signal; the flowmeter speed measurement technology measures the flow velocity according to the pressure difference. Commonly used flowmeters include differential pressure type, ultrasonic type, and vortex type, among which the differential pressure type flowmeter has higher requirements on the measurement environment and the accuracy of the measurement results. Low; Ultrasonic flowmeters have the disadvantages of complex structure and high maintenance costs

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