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Abstract <p>This study develops an optimized coil-only electromagnetic acoustic transducer (EMAT) system with enhanced detection circuitry for stainless steel 304 NDT applications. The proposed design specifically addresses ultrasonic echo attenuation (≤0.8 mVpp) and substandard signal-to-noise ratio (SNR &lt; 15 dB) through key improvements A finite element model integrating field-circuit coupling was developed to simulate the coil-only EMAT detection process. Simulation analysis and experimental validation were conducted to evaluate the effects of coil wire diameter and outer diameter on excitation and reception efficiency. Subsequently, Testing experiments were conducted on &#xa0;stainless steel 304 to investigate the relationships between discharge current and echo characteristics, high-voltage charging capacitance and voltage, and low-voltage charging capacitance and voltage. The results demonstrated that the optimal configuration involved a spiral coil with a wire diameter of 0.25 mm and an outer diameter of 20 mm. The recommended parameter values for high voltage, low voltage, high-voltage capacitance, and low-voltage capacitance were 800 V, 180 V, 300 nF, and 1000 μF, respectively.</p>

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Design Optimization of Coil-Only Electromagnetic Acoustic Transducers and Their Detection Circuits for Stainless Steel 304

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Di Wu,
  • Wenze Shi,
  • Qi Zhang,
  • Wei Liu,
  • Wenbin Liu,
  • Xiaokang Zhang,
  • Ningkai Fu

摘要

Abstract

This study develops an optimized coil-only electromagnetic acoustic transducer (EMAT) system with enhanced detection circuitry for stainless steel 304 NDT applications. The proposed design specifically addresses ultrasonic echo attenuation (≤0.8 mVpp) and substandard signal-to-noise ratio (SNR < 15 dB) through key improvements A finite element model integrating field-circuit coupling was developed to simulate the coil-only EMAT detection process. Simulation analysis and experimental validation were conducted to evaluate the effects of coil wire diameter and outer diameter on excitation and reception efficiency. Subsequently, Testing experiments were conducted on  stainless steel 304 to investigate the relationships between discharge current and echo characteristics, high-voltage charging capacitance and voltage, and low-voltage charging capacitance and voltage. The results demonstrated that the optimal configuration involved a spiral coil with a wire diameter of 0.25 mm and an outer diameter of 20 mm. The recommended parameter values for high voltage, low voltage, high-voltage capacitance, and low-voltage capacitance were 800 V, 180 V, 300 nF, and 1000 μF, respectively.