All-fiber valve leakage ultrasonic monitoring system

An ultrasonic monitoring, all-fiber technology, applied in the field of monitoring systems, can solve the problems of small frequency range of piezoelectric ultrasonic sensors, weak anti-interference ability, slow response speed, etc., to achieve improved dynamic range, long detection distance, and fast response speed. Effect

Inactive Publication Date: 2015-10-28
GUANGDONG FUAN TECH DEV
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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 overcom

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  • All-fiber valve leakage ultrasonic monitoring system
  • All-fiber valve leakage ultrasonic monitoring system

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[0029] Examples:

[0030] When using the all-fiber valve leakage ultrasonic monitoring system to monitor the valve in real time, the entire system is fixed near the valve position, one end of the optical fiber sensor 8 is connected to the end reflector 9, and the other end is connected to the ultrasonic monitoring host through the transmission optical cable 7 . The ultrasonic detection host includes an optical interference module, a light source module, a photoelectric conversion amplification acquisition module, a phase carrier modulation module (PGC), and a data processing module. Among them, the optical interference module includes a 3x3 coupler, two 2x2 couplers, delay fibers and mirrors. Among them, the 3x3 coupler 1 is connected to the light source module, the photoelectric conversion amplification and acquisition module and the two 2x2 couplers respectively (2, 5 ) Connection, one of the 2x2 couplers 2 is also connected to the reflector 4 through the delay fiber 3, and is...

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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...

Claims

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Application Information

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IPC IPC(8): G01M3/24
Inventor 贾波王超唐璜
Owner GUANGDONG FUAN TECH DEV
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