This master's thesis consists of 90 pages, 40 illustrations, 23 tables and 17 literary references.

In the master's thesis the possibility of building an ultrasonic system for controlling the threaded connection of drill pipes was conducted. A system was proposed that includes a set of transducers used as a phased array antenna.

Possible schemes of sounding in the system are investigated. The proposed mode of operation of the system is to determine the presence of cracks. The study found that the most effective is the echo method, which requires initial setup. The modern element base is analyzed, which satisfies the set requirements of the system by means of a phased lattice

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The master's thesis contains 98 pages, 42 figures, 25 tables, 35 references.

Keywords: ultrasound, capacitive ultrasonic transducers, medical diagnostics, excitation of acoustic vibrations

The work is aimed at solving the problem of designing capacitive-type ultrasonic transducers for medical diagnostics systems.
Based on the analysis of world experience, the efficiency of small-size highfrequency converters for their excitation by relatively low voltages has been evaluated. Experimental studies have been conducted to confirm the physical processes of oscillation excitation.

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The master's project consists of 78 pages, 35 illustrations and 2 tables. In this project the methods of indication of heart diseases and already existing, according to their working principle of the device were analyzed. Their advantages and disadvantages were determined on the basis of which the working principle was chosen. On principle, the electrical circuit was created that works on the FPGA. The circuit elements have been calculated and selected so that small sensors can be measured. The paper proposed a system, the advantage of which is that measurements are made in the intercostal environment due to the sufficiently small dimensions of the sensor.

The marketing component of the startup project was analyzed to describe the possible implementation and market directions of the system implementation.

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The master's thesis consists of four sections, 94 pages, 37 illustrations, 22 tables, 30 sources of literature were processed.
In the process of controlling various materials, an important factor is control performance. The use of automated systems significantly increases the rationality of flaw detection during production. One of the most common structural materials in the industry is aluminum. Quality control is an important task, however, and there is a need for increased speeds of control. The master's thesis includes four sections. The first section consists of an analytical review of automated eddy current systems, an overview of the object of control, and theoretical calculations of the importance of eddy current flaw detection. The second section provides a calculation of the overhead differential VSP from which the matrix VSP consists. Several variants of the structural diagrams of the system have been developed to provide different control performance. Measuring channel components, such as amplifier, bandpass filter, and analog-to-digital converter, have been calculated. The following section describes the algorithm of operation. The results of the simulation of the Mathlab software environment are presented, and the probability of control is calculated based on it. The last section is about developing a startup project.

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The master's thesis contains 93 letters, 20 drawings, 28 tables, 19 sources in the list of references, 4 applications.

Topicality of research

Technological development has led to the improvement of traditional natural structural materials and the emergence of new ones. Industries such as mechanical engineering, metallurgy, automotive, aviation, etc. require the production of quality products that must meet high quality standards. Each of the materials has certain physical and mechanical characteristics that affect the control of products made of structural materials. In particular, in ultrasonic nondestructive testing, such a characteristic as the attenuation of the ultrasonic wave significantly affects the metrological characteristics of the measurements and controls. That is why the urgent task is to develop new research methods.

The thickness of the control objects is an important indicator, which primarily indicates the strength of the product in the further process of its operation. Ensuring the control of the thickness of products made of materials with high attenuation is based on the development of methods for precise determination of the time of propagation of ultrasonic signals in the objects of control.

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  1. Tsymbal V. Brake disc robotic inspection system
  2. Myrhorodskyi O. Remote processing flaw detector
  3. Nazarchuk O. Thermal stabilization characteristics of the image guality of thermograph anol improving the informative value of medical thermograms
  4. Kurasov O. Ultrasonic inspection of elements of tubular constractions

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АСНК КПІ ім. Ігоря Сікорського, 2021