Industrial Automatic Control Systems and Controllers Annotation << Back Synthesis of a Mathematical Model of a Water-Heating Gas Boiler D.A. Loktev, K.A. Izotov The paper considers the application of fiber-optic technologies, including both image acquisition using cameras and subsequent determination of geometric parameters and recognition of defects of various objects on them, and fiber-optic sensors for measuring deformations of track facilities on the example of assessing the state of elements of artificial structures in the railway industry. The condition of the railway track is determined by measuring a set of parameters of the light pulse and detecting changes in these parameters depending on the deformation of the rails. This direction is especially relevant for track sections of variable stiffness, on which additional deformations often appear due to seasonal changes in the state of the railway track and the diff erence in the base stiff ness parameters. The use of the considered technologies makes it possible to detect not only clearly expressed external defects, but also less noticeable ones, which also need to be diagnosed and monitored in a timely manner in order to timely prevent accidents on the railway. Keywords: track facilities, fiber optic technologies, recognition of defects, measurements of rail deformations, the input and output pulse, signal envelope, parameters of optical fibers, frequency chirp. DOI: 10.25791/asu.2.2023.1419 Pp. 56-64.