Modeling of fiber-optic accelerometer of pendulum type

Analysis of scientific literature has shown that there is a lack of attention to the processes used in fiber-optic accelerometers, which operate under concentrated impact of destabilizing factors generated by compactly arranged equipment of power unit. Constructive and technological features of accelerometers are not considered, and there is no assessment of their metrological and operational characteristics in these conditions. Accordingly, there is no systematic description of the processes in fiber accelerometers and, in general, the approach to the solution of this important issue. The author studies the work of pendulum scheme accelerometer to control high frequency vibration in special conditions. In the developed scheme of the accelerometer the performance of optical fiber in the form of laminated layered structure allows to create and use discrete design diagram. According to this diagram:  a fiber is replaced by a cylinder, consisting of a series of concentric cylindrical layers, within each of which the voltage is considered to be constant. In each layer the refractive index is constant and the field is described by the ψ function; to estimate the magnitude of the refractive index in each layer the method of equal volume sec-tions can be used;  the task of coordination of two waveguide structures is considered as an excitation of the re-ceiving antenna by some given field of the radiating antenna. Based on the modified theory of related modes in tunnel-coupled optical fibers, the coefficient of radiation modes coupling in a coaxial structure, created under the influence of oscillatory processes, has been determined. The model of fiber-optic accelerometer, which has allowed to develop a measuring converter model for laboratory measurements and realize the devices modeling for their effective design, is further developed

fiber-optic accelerometer; optical fiber; coefficient of radiation modes coupling