The Ultrasonic Field Simulation Of The Spiral Coil EMAT And The Research For The Ultrasonic Field Of Array PZT Used In The Steel Tube Test

The experimental and theoretical analysis of the ultrasonic field for the spiral coil electromagnetic acoustic transducer (EMAT) and the piezoelectricity transducer array was researched in the thesis.The Maxwell equation of Electromagnetic field and the Christoffel equation in the stress analysis were used to get the analytical expression of ultrasonic field of the spiral coil EMAT. The numerical calculation was fulfilled utilizing the MATLAB tool and the results conformed the conclusion of the reference paper.The ultrasonic field was tested in the experiment of the array piezoelectricity transducer. The angle of incidence, angle of refraction and the range of the defects for various transducers were calculated with the acoustic ray theory. Ultimately the acoustic field image of the double-crystal angle transducer was obtained by the ultrasonic scan imaging system, which conformed to the theoretical calculated ultrasonic field in the steel tube.