Автогенераторні засоби контролю вологості нафтопродуктів на основі конденсаторних циліндричних структур

Abstract

The thesis is devoted to the development of the self-oscillating humidity control devices of the petroleum products based on the capacitive cylindrical structures, in which as a primary sensor used capacitive sensor, and as a self-oscillators used transistor structures with negative resistance, which principle work is based on the functional dependence of the oscillation frequency transistor structure with negative resistance to the petroleum products humidity changes. These devices provide quality of the petroleum products by controlling the humidity, with remote transmission of measurement results. In the thesis developed theoretical approaches to the creation of the humidity capacitive cylindrical structures based on mathematical physics and the self-oscillating humidity control devices of the petroleum products based on method of state variables, which allowed to obtain analytical dependences of the humidity sensitive capacitance to the petroleum products humidity, conversion functions and sensitivity equations of the developed devices. A microprocessor humidity control system of the petroleum products, and software in the environment «Maple» for modeling and calculation of characteristics of the capacitive cylindrical structures and the self-oscillating humidity control devices of the petroleum products with regard to dependence of parameters of elements of nonlinear equivalent circuit devices from the effects of the petroleum products humidity are designed.