ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Optimal design and application of high-temperature laser coil-only Rayleigh wave EMAT
Received date: 2025-03-12
Revised date: 2025-03-31
Accepted date: 2025-07-03
Online published: 2025-07-15
Supported by
Central Military-civil Integration Special Transfer Payment Project(GT202408141);National Defense Basic Research Projects(JCKY2022401C005);Training Program for Academic and Technical Leaders of Major Disciplines in Jiangxi Province(20225BCJ23023);Jiangxi Province Founds for Distinguished Young Youths(20212ACB214010)
Aimed at the problems of traditional permanent magnet or liquid-cooled permanent magnet type ElectroMagnetic Acoustic transducer （EMAT）， such as large volume， easy demagnetization of permanent magnet at high temperature and difficulty in sustained high temperature detection， a laser coil-only Rayleigh Wave （RW） EMAT detection method for high-temperature-sustained on-line monitoring is proposed. A finite element model for field-circuit coupling analysis of the aluminum alloy laser coil-only RW EMAT detection process based on the surface constraint mechanism was established， and the effects of key design parameters such as the excitation coil of the coil-only RW EMAT on the amplitude and wave packet width of the RW detection were analyzed by using orthogonal experimental method， according to which， the optimal design parameter combinations of the coil-only RW EMAT was obtained and verified by experiments. The laser coil-only RW EMAT high-temperature on-line detection system was developed， and the on-line detection experiment of surface crack defects of high-temperature aluminum alloy at 20-500 ℃ was carried out. The results show that the number of wire splitting and coil turns of the receiving coil （meander coil） have a major influence on the received signal amplitude and wave packet width of the coil-only RW EMAT， respectively. The receiving amplitude of the optimized coil-only RW EMAT is increased by 1.67 times. Furthermore， the on-line detection of surface crack defects of 500 ℃ high-temperature aluminum alloy can be realized by using the differential circuit device and matching the width of the laser line light source with the turn spacing of the coil-only RW EMAT coil. The proposed method provides theoretical support and technical guidance for laser coil-only RW EMAT high-temperature on-line non-destructive testing and monitoring.
Lifei DONG , Zichen DENG , Chao LU , Wenze SHI , Pan HE , Weiwei CHEN . Optimal design and application of high-temperature laser coil-only Rayleigh wave EMAT[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2026 , 47(3) : 431970 -431970 . DOI: 10.7527/S1000-6893.2025.31970
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