Quadraphonic transmission ultrasonic defectoscopy (QTUD) is a new method of ultrasound. This paper presents a detailed and systematic view of the measuring procedure that enables the discovery of a necessary optimal balance between, on the one side, efficiency and reliability of the QTUD measuring system, and on the other, minimizing the investment costs in the measuring components precision. This type of defectoscope applies relatively low frequencies of just a few tens of kilohertz that enable the necessary signal penetration during the measuring procedure. This paper shows a defectoscopic examination of the standard aluminum material AlMg3 with a defect that has been purposely created in need of developing the QTUD measuring procedure, whereby varied wave forms and the amplitude levels of signal have been used for the purpose of their optimization.
During the ultrasound defectoscopy the ultrasound absorption factor inside the material is raised to the fourth power of frequency. In conjunction with the previously stated, the attenuation of the sound signal which is caused by the reflections of the sound inside the sample, the application of high frequency ultrasound in porous and hollow materials is very limited or even impossible. The frequencies are the reason for this, because they are in the range of just several megahertz, which are currently the main trend in the ultrasound examination. This paper presents a principle of this new method, including the experimental results from its application on the typical represent of product packaging material. Also, it is shown that the expressed absorption of ultrasound waves from porous and hollow structures can be avoided by applying the method with such low frequencies.
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