Electromagnetic ultrasonic detection method for steel plate based on phase control technique
YANG Li-jian
LIU Ke-cheng
GAO Song-wei
XING Yan-hao
Abstract：In order to improve the electromagnetic ultrasonic echo signal in the steel plate,an electromagnetic ultrasonic detection method for steel plate based on phase control technique was proposed.The phase control focusing technique and the transduction mechanism of electromagnetic ultrasonic transducer in steel plate were studied,and the excitation transducer array was composed of multi array elements.With the time delay rule,the equiphase superposition of ultrasonic was achieved in the target area,and the ultrasonic focusing was realized.In addition,the experimental verification was carried out on Q235 steel plate with the discrete structure.The results show that the proposed method can effectively compensate the phase deviation caused by the sound path difference between exciting and receiving transducers.When the excitation voltage is consistent,the amplitude of the echo signal received at 658 mm from the transducer array increases as 2 times as that of echo signal with the single excitation of central transducer.With the three-element excitation transducer array detection method,the ultrasonic focusing of defects can be realized.Furthermore,the amplitude of defect echo signal at 520 mm increases as 1.83 times as that of echo signal with the single excitation of central transducer.
Keywords：electromagnetic ultrasonicphase control techniquetransducer arraytime delay ruleequiphase superpositionultrasonic focusingphase deviationecho signal
Publication Date：2016-08-31
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 513-519 )