THE IMPROVEMENT OF THE PULSE-ECHO TECHNIQUE FOR CONTROLLING THE THICKNESS OF PRODUCTS AND MATERIALS
Keywords:
pulse-echo technique, thickness control, ultrasound, guided waves, structuresAbstract
An approach to the increasing of the thickness control precision by means of the pulse-echo technique is presented. Types of errors that occur in the existing pulse-echo technique of control are described. Their causes are defined. It is shown how to reduce the errors under time delay of the ultrasonic beam expansion from the primary transducer to the monitor object. The method of calculating the propagation time of the ultrasonic beam between the first and second pulse-echo while controlling the thickness is proposed. The mathematical calculation of wave parameters of the guided ultrasonic waves is described. This made it possible to offer a method for determining the propagation speed of ultrasound in the real object of control. The proposed method is based on measuring the test object wave number of a zero antisymmetric mode of the guided ultrasonic wave and the subsequent determination of parameters of ultrasound propagation.
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