For the continuous operation of the hydraulic system it is necessary to monitor the condition of the hydraulic fluid, which during its service life is subject to degradation processes that change its physical and chemical composition. In this thesis we have designed a prototype of a sensor for monitoring the aging of hydraulic fluid. The sensor works on the principle of monitoring changes in the dielectric constant of the oil. We found that the dielectric constant also depends on the temperature of the fluid, so it is necessary to measure it as well.
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