DOI: 10.22184/1993-7296.FRos.2021.

This work is devoted to the development of a design of a reflective element for an amplitude fiber-­optic vibration sensor, as well as testing the performance of such a design. In the presented work, a mathematical model of transverse vibrations is described, which helps to determine the resonance frequencies depending on the length of the free fiber. A reflective surface is implemented, which is a periodic structure of lithium niobate and areas covered with gold. The layout and design of a vibration sensor with the ability to tune the resonance frequency is presented, and an experimental circuit is demonstrated. The signal obtained using the described circuit lends itself to Fourier transform processing, the calculated frequencies coincide with the vibration frequencies of the vibration source. The amplitude-­frequency characteristic is obtained, the resonance frequency correlates with the frequencies obtained by the mathematical model (Pearson’s correlation coefficient is 0.977). The results of the implementation of this development are important for a new interdisciplinary direction – ​agrobiophotonics, provide a key to a more subtle and accurate study of animal vibration sensitivity and plant vibrotropism.


Разработка: студия Green Art