Scientific, methodological and technical bases of experimental studies of laser triangulation means for measuring the geometric characteristics of firearms bore

The work is devoted to the development of scientific and methodological foundations for experimental studies of a laser triangulation measuring device for measuring the geometric characteristics of firearms bore. The results of the analysis of publications devoted to the study of known measuring instruments based on the principle of laser triangulation are considered. Limitations in the application of known research results for the creation of an experimental setup for the study of a laser triangulation means of measuring the geometric characteristics of firearms bore are noted. The essence of the method of technical diagnostics of firearms barrel channels, which is the basis of the studied measuring instrument, is outlined. The construction features, basic geometric parameters, and conversion function of the laser triangulation sensor of the measuring instrument are presented. The design and principle of operation of the experimental setup are substantiated, and the description and main characteristics of its elements are given. The structural diagram of the experimental setup is illustrated, and the mechanical, optical, and interface connections between its elements are determined. The basic operations of preparing the experimental setup for research are considered. The methodology of the experiment is described in detail, which provides for a stepwise increase in the angular and axial coordinates of the sensing point on the surface of the barrel model in a certain range of movements while fixing the coordinates of the middle of the sensing spot. A formalized method of presenting such an array of coordinates in the form of a table is proposed. The method of processing the obtained results by converting the data of the tabulated array of coordinates into the results of measuring the radius of the barrel layout, which is based on the inverse expression of the transformation function of the laser triangulation sensor, is considered. Recommendations are given for visualizing the results of determining the radius of the barrel layout in the form of two- and three-dimensional graphs.