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OPTICAL FIBER AS A BASIS FOR CREATING SENSORS FOR IDENTIFYING LIQUIDS AND DETERMINING THE CONCENTRATION OF SOLUTIONS

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Currently, sensors based on optical fiber are widely used to control various kinds of objects. Compared with other types of sensors, such sensors have a number of advantages, such as: electrical safety, immunity to electromagnetic influences, the ability to use in combination with optical fibers that transmit data on the state of controlled objects or environments. Fiber-optic sensors are chemically neutral and sufficiently resistant to chemical effects of various kinds, and can also be used to monitor the condition of objects with flammable and explosive liquids. Of particular interest in this regard is the use of such sensors in the chemical and food industries to determine the presence and level of liquids in production containers and measure the concentration of solutions. The possibility of using optical fiber as the basis for sensors for identifying liquids and sensors for determining the concentration of substances dissolved in water is established. Reflectograms of an optical fiber obtained by immersing the end of the fiber in various liquids are analyzed. It is found that magnitude of the peak of the optical fiber reflectogram corresponding to the location of the interface between the core of the optical fiber and the environment, and depends on the refractive index of the liquid in which the end of this optical fiber is located. It is proposed to use the value of this reflectogram peak as an information parameter for identifying liquids having different refractive indices, as well as determining the concentration of substances dissolved in water. The possibility of using an optical fiber in combination with the method of optical reflectometry to create sensors for identifying liquids and determining the concentration of solutions is proved.

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