Metrological Support of the Thermal Vision Method of Defectoscopy

Various non-metallic heterogeneous materials and structures are widely used in many industries. Undoubtedly, the use of such mediums and the quality of construction materials require the development of countermeasures and measurement of their parameters. The most promising are non-destructive methods, among which thermal control methods can be singled out. The article is devoted to studying the influence of mechanical stimulation parameters on the distribution of temperature fields with the acoustic infrared thermometric method of counter products made of non-metallic heterogeneous materials. This method is based on the emergence of temperature fields in materials with structural defects under the influence of vibration. Experimental studies of carbon plate defects in the form of “dull drilling” were carried out on a specially designed stand for the excitation of mechanical vibrations. The dependence of the parameters of thermal processes on the frequency of mechanical vibrations, the time of their impact, and the distance from the point of application of the vibrations to the defective zone was determined. At the same time, the temperature contrast was used as an optimization criterion, as a natural characteristic of comparing thermal control procedures. Considering the anisotropy of the physic and mechanical properties of the material under study, the control was carried out in two positions of the plate relative to the direction of propagation of mechanical oscillations: at an angle of 45° to the fibers and perpendicular to it.