Application of the Digital Orthogonal Method of Phase Measurement for Characteristics Materials Definition by Ultrasonic Method

Abstract

Background. The article is devoted to the problem of accuracy increasing for physical-mechanical characteristics definition of powdered materials at the stage of their manufacture using ultrasonic testing. Objective. The realization of the phase method of time interval measurement in a system of ultrasonic testing of powdered materials in order to increase accuracy of definition their physical-mechanical characteristics is done. Methods. It was proposed to use digital orthogonal method for definition of the phase shift between signals to reach the aim. Computing simulation in Matlab system for definition of the signals phase shift and estimation of its inaccuracy of measurements was carried out. Results. As the result of this investigation it was defined the optimal parameters of the principal element of a measuring system for the phase shift – ADC which was the main source of errors and essentially influenced the measurement accuracy. Conclusions. Experimental investigations on well known materials indicated effectiveness of application of the digital orthogonal method which allowed defining the velocity of ultrasound propagation in a solid medium with accuracy less than 1 %.