一种高性能电磁超声传感器线圈背板及其优化设计

doi:10.3976/j.issn.1002-4026.2022.02.009

Abstract

Abstract:

To improve the energy conversion efficiency of electromagnetic acoustic transducers (EMATs), the coil backplane of the EMAT is optimized. First, the influence of the coil backplane thickness on ultrasonic signals is evaluated via experimental research. Then, the carbonyl iron powder plate is selected as the coil backplane and its influence on the magnetic field of the sensor working area is analyzed via finite element simulation. Finally, the performance of EMATs before and after optimization is compared using experiments. Results show that the optimal thickness of the coil backplane is 1.5~2.0 mm. Moreover, the use of the carbonyl iron powder plate with the same size as the coil working area of the coil backplane can improve the transduction efficiency of EMATs. Compared with the sensors that use nonmagnetic materials as coil backplanes, the SNR of the optimized sensors doubled and the working lift-off distance increased 1 mm, respectively.

Key words: EMATs, bias magnetic field, coil backplane, carbonyl iron powder

CLC Number:

TH878

CHEN Jian-wei,LIU Shuai,MA Jian,GUO Rui,SONG Jiang-feng,BAI Xue,ZOU Long-sen,SU Yi-fan. High-performance coil backplane for electromagnetic ultrasonic sensor and its optimization design[J].Shandong Science, 2022, 35(2): 70-78.

Figures/Tables 11

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References 24

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材料	相对磁导率	电导率/(kS·m^-1)	磁强度/(kA·m^-1)
钕铁硼	1.1	625	1 250
羰基铁粉板	30	0.01	0
塑料板	1	0	0
铝板	1	37 600	0
空气	1	0	0

High-performance coil backplane for electromagnetic ultrasonic sensor and its optimization design

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