Feasibility Research On Metal Magnetic Memory Based Intelligent Piping Technique

With the development of modern industry,pipeline transportation plays an important role in industrial production and social life.At the same time,the increasing safety problems of pipeline transportation concern the world.This paper researches on the feasibility of metal magnetic memory based intelligent piping technique,including the design of detection system,the pipeline making for experiments and the metal magnetic memory based detection approach as key steps.This paper introduces the detection principle of metal magnetic memory,the hardware and software design of detection system and the experiments for testing.The MSP430F149 based hardware is composed of the module for magnetic field detection with HONEYWELL HMC1021 magnetoresistance sensor as the probe and the module for communication. The software includes MCU program,VB program for monitor computer and MATLAB algorithm program.During the experiments,pipeline with cracks for the testing is first made by linear cutting and butt welding.Then the field signal is measured by the detection system while the data is transferred to the monitor computer by MCU,saved by VB program and processed by MATLAB algorithm program.Then crack position on the pipeline is then located by zero-crossing point of detected normal component H_p(Y)in the leakage magnetic field and maximum gradient. Finally the location is compared with the actual crack position to get the feasibility conclusion.By large numbers of experiments,this system achieved the purpose of the experiment and validated the feasibility of this detection technique.