Identification method based on time and frequency domain features ofultrasonic backscattering signals of polycrystalline materials

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.