Krinochkin R. Radiomeasuring transducers to determine the films thickness based on the devices with negative resistance

Object of research is the process of converting the values of thickness in the frequency signal in the sensitive semiconductor structures. The aim is to increase the sensitivity and resolution of the converters to determine the thickness of the films, the principle of which is based on the use of the functional dependence of the oscillation frequency of transistor structure with a negative resistance by varying the thickness of the material being measured. To achieve this goal used methods that rely on the use of: the partial capacitance method and conformal mappings, the method of state variables, complex function theory, differential and integral calculus to determine the transformation functions and the sensitivity of radio transmitters on the basis of the thickness of the devices with negative resistance. The novelty of these results is that in order to create converters for determining the thickness of the material by the applicant for the first time proposed a method using reactive properties of transistor structures with negative resistance, which implement the principle of converting "thickness - rate". The mathematical models of radio transmitters to determine the thickness of the films which, unlike existing ones, performed in the time domain, making it possible to obtain the dependence of the voltages and currents of the time. Improved methods for circuit-functional organization of radio transmitters to determine the thickness of the films in which, unlike existing ones, takes into account the influence of the thickness of the measured material parameters of elements of the converter circuit, which made it possible to transform function, sensitivity and resolution. The practical value lies in the fact that the developed mathematical models can be used to calculate the conversion function, sensitivity and other characteristics of radio transmitters to determine the thickness. The software that implements these calculations. Put forward recommendations regarding the use of radio transmitters in production of film materials. The degree of implementation - results of the thesis introduced in the company of "SBC Vodproekt" (Vinnitsa), as well as in the educational process at the Department of Radio Engineering Vinnytsia National Technical University. Scope of use - at enterprises producing plastic materials, as well as in facilities that use or produce the protective polymer and other film coatings.