Two-dimensional Development Of Testing Instruments For Magnetic Memory

Metal magnetic memory does not require additional excitation signal, through theprobe receiving component itself out of the feedback signal (surface leakage magneticfield) of component to the stress distribution, internal damage evaluation, the signalcan reflect the true effective internal components to stress concentration of characterof early damage.Metal magnetic memory testing has some advantages that many other methods do nothave. But the lack of theoretical research and insufficiency instrument restricted thedevelopment of magnetic memory testing technology, especially there is littlebreakthrough in the quantitative evaluation of the stress concentration. This paper is toimprove the previous detection methods and instruments.Firstly, this paper based on the electromagnetism and stress-magnetic conductancetheory, detected the normal component of the zero crossing and the tangentialcomponent of the maximum at the same time. Designed a instrument that based onmagnetic memory the two-dimension detection principle to determine the degree ofstress concentration.Secondly, the instrument used Python and C language to build a magnetic memorytwo-dimensional detection system, and be applied in ARM7development board,Raspberry Pi and x86platform. In order to meet the two-dimension detection ofmagnetic memory needs, designed the sensor probe with the corresponding signalprocessing circuit and acquisition circuitry.Finally, the instrument was used to detect the aircraft landing gear. Through thestatistical analysis and comparison, the instrument can found and evaluated stressconcentration. The instrument in this paper opened a new situation for quantitativeanalysis of metal magnetic memory testing technology.