Theoretical Study on Near-Field Length of Acoustic Field for Phased Array Ultrasonic Testing
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摘要: 相控阵超声检测技术可靠高效、无辐射，可应用于工业无损检测中。对于均匀各向同性材料工件，尤其是焊缝的相控阵超声检测，可采用超声斜入射脉冲横波扇形扫描检测的方法。探讨相控阵超声探头辐射不同偏转角度声场的近场区长度问题，进行了理论计算和仿真分析，发现焊缝检测中常用有机玻璃楔块角度为36.2°时，偏转角度越大，近场区长度越小。结果可为相控阵超声检测工艺设计和检测设备校准提供参考。Abstract: Phased array ultrasonic testing method is of flexible, reliable, efficient and suitable for industrial nondestructive testing. Near-field length was investigated for phased array ultrasonic testing homogeneous isotropic work pieces using oblique incident pulse shear wave. The theoretical calculations of near-field length and the simulations of the acoustic field for various deflection angles in phased array ultrasound inspections were carried out. It is shown that the near-field length decrease with increasing deflection angles when using general plexi-glass wedge of inclination angle being 36.2°. The conclusions of this paper can provide some reference for designing the testing procedure.
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