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The Researching of Alternating Current Field Measurement Imaging Technology

Author: LiuJiaLi
Tutor: LuoFeiLu
School: National University of Defense Science and Technology
Course: Instrument Science and Technology
Keywords: Alternating magnetic field measurements Scan imaging Surface cracks Defect Recognition Amplitude image display
CLC: TG115.284
Type: Master's thesis
Year: 2010
Downloads: 94
Quote: 0
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Abstract


Alternating magnetic field measurement ( ACFM ) is the rise in recent years , a new type of electromagnetic non-destructive testing technology, it can achieve the measurement of the size of the metal surface cracks . Based on this study the case of the alternating magnetic field scanning imaging detection technology of the alternating magnetic field technology and imaging technology research status and development trend , the use of finite element numerical simulation method the excitation coil along different scanning direction , the magnetic field disturbance on the defect distribution analysis, draw the magnetic field component of the curve Bz and the magnetic field component Bx of the curve , respectively, and the length and depth of the defect corresponding relation . The alternating magnetic field scanning imaging detection system hardware and software design , to build an experimental platform . The wavelet transform for detecting the signal-to-noise removal , from the qualitative point of view , the recognition method of Crack method of analysis is obtained from the detection signal for the defect length and depth . Last scan imaging technology , respectively with the Bx and Bz detection signal of the amplitude information of the C - scan image Classifying defects manner jointly by the two images combined length information and the depth information of the new method . Measured data on the experimental platform for the design , experimental specimen surface cracks , scanning and imaging results , with the agreement of theory and simulation results .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallurgy ( Physical Metallurgy ) > Analytical tests of the metal (Metal Testing and Materials ) > Physical test method > NDT > Magnetic flaw detection
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