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Comparison of Dual-magnetic Flux Detection Technology in the Industrial Pipeline Testing System Research and Application

Author: FanWei
Tutor: HeFuYun
School: Hefei University of Technology
Course: Circuits and Systems
Keywords: Non-destructive testing Magnetic flux leakage detection technology Magnetization Dual magnetic flux detection Signal processing Virtual device driver
CLC: TH878.3
Type: Master's thesis
Year: 2009
Downloads: 86
Quote: 1
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Abstract


The magnetic flux leakage detection technology is a method of nondestructive testing based on electromagnetism , this detection technology has been rapid development and widely used in iron and steel , petroleum, chemical and other industrial fields . The principle of the ferromagnetic material is magnetized, the magnetic field lines of the defect bending deformation occurs and leaked out of the surface defects , the use of the sensor detects a leakage magnetic field and the magnetic field strength of the defects , and thus determine a defect of the relevant circumstances . But in many parts of the industrial pipeline are not aspects of demolition, if you want the pipeline a root dismantled detection , time-consuming , and the pipe outer layer as well as a protective layer , you need to dial the protective layer to go before being detected , very troublesome. Therefore , this paper developed a two- flux comparison method detection technology , non-destructive testing, in-service industrial pipe and the effect is also very good , completely solve the problem . Industrial pipeline using a magnetic flux leakage before detection fully magnetized , the magnetization of the pole piece and the smaller the gap between the pipe wall , the stronger the signal of the detected defect , by magnetizing the higher the efficiency , adjusting the intensity of magnetization of the magnetizer so that they magnetization reached near saturation magnetization stage of the pipeline , has the best detection results . On the pipeline after the saturation magnetization , the dual magnetic flux detection method can be effectively detected by the magnetic flux of the defects , the defects in the magnetic flux is converted into a digital signal through the digital conversion card electrical signal transmitted to the computer , to use software to achieve visualization . Can use this method in magnetic flux leakage detection system will bring more convenience to give in - service industrial pipe detection .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Material testing machine and test equipment > Nondestructive flaw detector > Magnetic detector
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