Study on adaptability of the identification method of metal material based on ultrasonic attenuation coefficient spectrum
LU Kang1, HE Xiping1*, LU Ju2, ZHANG Hongpu1, AN Xiaoxiao1, HE Shengping3, NI Tao3
(1 School of Physics and Information Technology, Shaanxi Key Laboratory of Ultrasonics,Shaanxi Normal University, Xi′an 710119, Shaanxi， China; 2 Shaanxi Linghua Electronic Co.,LTD, Baoji 721006, Shaanxi， China;3 11 Subbox,150 Mailbox, Baoji 721013, Shaanxi， China)）
Abstract:
Using attenuation coefficient spectrum to identify metal material is a kind of accurate and reliable method. On this basis, the factors which may affect the method have been studied, such as pressure on the probe, frequency of probe, pulse voltage and repetition rate, coupling and thickness of the material.The results show that the identification result is stable when the pressure on the probe is greater than or equal to 200g. With the increase of probe frequency in a certain range, the Rayleigh scattering coefficient is greater and the scattering signal is more obvious.The choice of the probe frequency and size of the thickness of material should base on the obvious scattering signal.The size of the pulse voltage and the gain and the situation of the coupling have not been changed optionally. The identification result is stable when the average number of the oscilloscope is 2 000 times.The pulse repetition rate can be adjusted within a certain scope, it will not affect the identification effect.
KeyWords:
attenuation coefficient spectrum; metal material; scattering attenuation
