Identification method based on time and frequency domain features ofultrasonic backscattering signals of polycrystalline materials
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摘要: 利用多晶材料微结构差异对超声波传播的影响特性，提出了一种计算超声回波信号特征量的算法，根据拉依达准则设定了识别阈值并编译了识别程序。采用所提方法对金属材料和陶瓷材料样品进行超声检测试验。试验结果表明，该方法可对材料和尺寸完全一致的样品实现准确识别。Abstract: An algorithm for calculating the features of ultrasonic echo signals was proposed based on the influence characteristic of the microstructure difference of polycrystalline materials on ultrasonic waves. The recognition threshold was determined according to the Pauta criterion and the identification algorithm was compiled as an application program. The ultrasonic identification experiments were carried on the samples of metal materials and ceramic materials. The results showed the objects with the same materials and sizes can be identified accurately.
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Keywords:
- ultrasonic identification /
- ultrasonic backscattering /
- grain size /
- pauta criterion
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