Forward Research on Magneto-acoustic Imaging in Frequency Domain based on Continuous Wave
ZHANG Shunqi
ZHOU Xiaoqing
YIN Tao
LIU Zhipeng
Abstract：The common time domain processing method in magneto -acoustic tomography (MAT)is disturbed by the high fre-quency stimulated pulse in space,which can limit the image quality.A new frequency domain measuring and processing method to de-tect the weak signal of MAT by using lock-in technique was introduced and studied in this project.The mathematics model was estab-lished.The simple conductivity edge model of simulations and experiments detecting based on sinusoidal excitation were conducted to validate the theory.Simulating results showed that the conductivity information was contained in the frequency signal based on the fre-quency domain MAT imaging method.Experiment results were in accord with the simulating results.Also,the precision of the frequen-cy method could achieve 10 -7 Pa,and the stimulating current could be smaller than 1 mA.In conclution,the proposed frequency MAT method may be helpful to improve the measurement precision,and realize higher resolution by using low frequency excitation.It would be significative to measure the inner conductivity of the medium.
Keywords：Magneto-acoustic tomography(MAT)Frequency domainLock-in amplifyAmplitudePhase
Publication Date：2015-01-01
Online Publishing Date：2026-09-11(First online date of this platform, not the publication date of the document)
Pages：6( 1-6 )