All-fiber valve leakage ultrasonic monitoring system

Abstract

The invention relates to an all-fiber valve leakage ultrasonic monitoring system. The system includes an ultrasonic detection host, a fiber sensor, an end reflection head, and a transmission optical cable. The fiber sensor is used for sensing leakage of a valve. The end reflection head is used for reflecting light beams. The transmission optical cable is equipped with a fiber inside, and is used for transmitting light beams. One end of the fiber sensor is connected to the ultrasonic detection host through the transmission optical cable, and the other end of the fiber sensor is connected to the end reflection head. The system solves the problems that a conventional monitoring method is poor in sensitivity and low in reaction speed, and overcomes the disadvantages that a piezoelectric ultrasonic sensor is small in frequency scope and high in driving voltage, short in application distance and poor in anti-interference capability. The system is capable of monitoring ultrasonic signals in real time, is passive, is wide in frequency scope, quick in reaction speed, high in sensitivity, long in detection distance and wide in application environment, has a high anti-interference capability, and is especially greatly improved in dynamic scope.

Description

technical field [0001] The invention relates to a monitoring system, in particular to an all-fiber ultrasonic sensor system for monitoring valve leakage, that is, an all-fiber ultrasonic valve leakage monitoring system. Background technique [0002] The traditional methods used in monitoring valve leakage at home and abroad, such as pressure distribution method and cross-correlation analysis method, have a high false positive rate and can only be reliably applied to large leakage, while characteristic impedance detection method and pressure point analysis method have a slow reaction speed . In comparison, ultrasonic leak detection has high reliability and fast response speed. However, piezoelectric wafers are mainly used as sensors at present, and the vibration mechanical energy of the piezoelectric wafer resonator plate caused by the received ultrasonic signal is converted into electrical signals to detect ultrasonic signals. . This type of piezoelectric ultrasonic sensor...

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to propose an all-fiber ultrasonic valve leakage monitoring system, which not only solves the problem of insufficient sensitivity of traditional monitoring methods, but also overcomes the pressure The electro-ultrasonic sensor has the defects of small frequency range, high driving voltage, short applicable distance and weak anti-interference ability, and the dynamic range has been greatly improved.

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