Physical bases for creating pressure sensors on the basis of change of light properties at micro-bending of optical fiber type G.652

This article is devoted to the development of physical foundations for creating pressure sensors based on changes in the properties of light during microbending of a G.652 fiber type. The relevance of developing a fiber optic pressure sensor simplified in design for the mining industry, which has a more stable temperature correction, which will avoid the known drawbacks of various optical interferometers, is considered. An important point is the use of a single-mode optical fiber of the G.652 standard, which is simultaneously used as a sensor and a guiding system for transmitting electrical signals. The proposed information-measuring system based on fiber-optic pressure sensors is capable of making remote measurements of the pressure parameters of the rock mass on the enclosing lining. The article gives the main expressions that allow us to describe the physical process of measuring pressure based on the effect of photoelasticity that occurs during microbending. The results of field experiments proving the change in the diffraction spot at the exit from the optical fiber depending on the magnitude of the microbend are presented. The simulation was performed in the universal program of finite element systems ANSYS STATIC STRUCTURAL. This sensor is able to record not only the measurement of pressure, but also the temperature and micro displacement of rocks. The proposed design of fiber-optic sensors can be used to monitor the geotechnical state of mine workings, dangerous for the explosion of gas and coal dust.

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