高温激光-仅线圈式表面波EMAT优化设计及应用

doi:10.7527/S1000-6893.2025.31970

Abstract

Abstract:

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.

Key words: high-temperature detection, laser, coil-only RW EMAT, surface constraint, field-circuit coupling, orthogonal test

CLC Number:

V261.3

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 Aeronautica et Astronautica Sinica, 2026, 47(3): 431970.

Figures/Tables 27

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参数	数值	参数	数值
试样高度h_s/mm	30	跑道线圈空腔间隔c_r2/mm	3
试样宽度w_s/mm	120	曲折线圈提离h_g/mm	0.2
磁轭高度h_m/mm	2	励磁-接收距离h_c/mm	0.1
曲折线圈导线宽度a/mm	0.10~0.25	跑道线圈-磁轭距离h_l/mm	0.05
曲折线圈导线高度b/mm	0.175~0.070	激励-接收距离d_c/mm	70
曲折线圈导线间距c/mm	0.3	跑道线圈-磁轭左/右端距离c_r3/mm	2
曲折线圈匝间距d/mm	1.5	电磁趋肤深度k/mm	0.1
曲折线圈导线分裂数S_p	1~4	水膜宽度w_f/mm	12
曲折线圈匝数N₁	4~16	水膜厚度h_f/mm	3
曲折线圈空腔间隔c_r1/mm	5	激光线源宽度e/mm	1.5
跑道线圈线径d_r2/mm	0.26~0.40	激光能量Q₀	185
跑道线圈线间距s_r2/mm	0.05	激光脉冲持续时间t₀/ns	8

参数	数值	参数	数值
弹性模量E/GPa	70	恒压热容c_v /（J·（kg∙K）^-1）	900
泊松比	0.33	热导率k/（W·（m∙K^-1））	238
密度ρ/（kg·m^-3）	2 700	电导率σ/（10⁷ S·m^-1）	3.774
热膨胀系数α/（10^-5 K^-1）	2.3

序号	a/mm	b/μm	S_p	N₁	d_r2/mm	RW幅值/（10^-5 V）	RW波包宽度/μs
1	0.10	17.5	1	4	0.26	1.64	2.85
2	0.10	35.0	2	8	0.30	4.40	4.09
3	0.10	52.5	3	12	0.35	7.26	6.35
4	0.10	70.0	4	16	0.40	8.81	8.56
5	0.15	17.5	2	12	0.40	5.46	6.17
6	0.15	35.0	1	16	0.35	2.68	8.19
7	0.15	52.5	4	4	0.30	5.11	2.17
8	0.15	70.0	3	8	0.26	5.17	4.21
9	0.20	17.5	3	16	0.30	6.02	8.47
10	0.20	35.0	4	12	0.26	5.40	6.47
11	0.20	52.5	1	8	0.40	3.06	3.98
12	0.20	70.0	2	4	0.35	3.93	2.86
13	0.25	17.5	4	8	0.35	7.89	4.31
14	0.25	35.0	3	4	0.40	6.24	2.88
15	0.25	52.5	2	16	0.26	3.36	8.32
16	0.25	70.0	1	12	0.30	2.34	6.05

预测组合	a/mm	b/μm	S_p	N₁	d_r2/mm	RW幅值/（10^-5 V）
最差	0.20	52.5	1	4	0.26	1.58
最佳	0.10	17.5	4	16	0.40	8.98

Optimal design and application of high-temperature laser coil-only Rayleigh wave EMAT

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