PRECISION MEASUREMENT OF THE VELOCITY OF PROPAGATION SHS WAVE BY THE METHOD OF CHRONO-TOPOGRAPHICAL ANALYSIS
The paper describes a method for detecting reaction cells with a given depth of response on thermal images. A technique has been developed for the formation of chronographic and topographic maps of the process from the cells that make up the combustion front. It is shown that the integral chronographic map allows us to identify the ergodicity of the SHS process and reduce by 1-2 orders of magnitude the size of the confidence interval in the estimated propagation velocity of the combustion front. A method is proposed for measuring the propagation velocity of the SHS process, which takes into account the deviation in the orientation of the regular grid of the matrix sensor of the chamber from the normal to the combustion front. The method combines the analysis of chronographic and topographic maps and integrates two approaches to determining the direction of the normal: the analysis of spatial data of thermal images; control of the delay time of appearance of the reaction front in different normal sections. The estimation of the error of the method was performed in the course of experimental studies of the SHS phenomenon in the Ni-Al system. It is shown that for high-resolution thermal imaging data (5.8 μm and 2 ms) with a sensor size of 1 MP, the error is 0.05 %, and using higher-dimensional sensors or a tracking thermal control, you can achieve a value of 0.0005 %.