Hu H.,Changsha University |
Hu H.,Hunan Province Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle |
Wang Z.,Hunan Province Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle |
Peng L.,Hunan Province Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle |
And 2 more authors.
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2016
To improve the computational efficiency of synthetic aperture focusing in immersion ultrasonic imaging, the root mean square velocity model is adopted for domain synthetic aperture focusing imaging in time domain. To verify the accuracy of the model, the propagation time of ultrasonic beam in the multilayer medium is calculated with the root mean square velocity model, which is compared with the result solved by Snell's law. With an example of immersion ultrasonic testing of steel block, the B-scan imaging, the synthetic aperture focusing imaging based on ray tracing technology and root mean square velocity are investigated respectively. The voltage amplitude of the defect hole along the center of a horizontal and vertical center axis with three methods are extracted. The calculation results show that the imaging resolution and signal to noise ratio(SNR) of two methods of synthetic aperture focusing imaging are almost the same, and the synthetic aperture focusing imaging efficiency based on root mean square velocity is almost 15 times that of the Snell's law. It provides an efficient method for synthetic aperture focusing immersion ultrasonic imaging. © 2016, Science Press. All right reserved.