Application of Optical Fiber Sensors for Temperature Control in Medical Equipment

The paper presents the results of determining the influence of temperature on the optical parameters of an inclined Bragg grating and the analysis of the possibility of its use as a temperature sensor for monitoring the state of biomedical equipment. Methods for determining the thermal modes of the element base are the basis for analytical calculation of reliability indicators of biomedical equipment related to the temperatures of individual elements of the electronic structure. Currently, optical methods of radiation control are widely used in various fields of science and technology, due to the fact that it is possible to change the following parameters of a light wave: amplitude, frequency, phase, polarization and direction of propagation. Optical devices such as modulators, deflectors and filters are characterized by high speed, low control power, simplicity of design and high reliability. These advantages have ensured their wide application not only in laser physics, but also in measurement technology, ecology, medicine, military sphere, etc. Today, the influence of temperature on the optical parameters of inclined Bragg gratings has been studied practically insufficiently. The work investigates a temperature sensor based on the use of an inclined Bragg grating, where the spectral characteristics and parameters of which change under the influence of temperature. Mathematical models for determining the parameters of the thermal field of elements of biomedical equipment are proposed. Analytical solutions for calculating temperature determination based on the use of Bragg gratings are obtained, which take into account heat removal from all surfaces of the elements. The work, in terms of the relevance of the problem and the ways of its implementation, corresponds to modern trends in world science and technology. It was concluded that the change in the length of the Bragg wavelength with temperature gives a linear dependence. There is a different sensitivity in each temperature range, therefore the resulting value was obtained by calculating the average value for the entire temperature range for each Bragg grating.