The master's dissertation consists of 4 sections, 75 pages, contains 18 illustrations, 29 tables, was processed 28 sources.

Relevance of the topic: The main task of the development of ultrasonic flaw detection is to increase its spatial resolution, which depends on a number of characteristics of the flaw detector and the wavelength used to control oscillations. This problem can be solved in two ways: the use of ultrasonic oscillations of higher frequencies (decrease in wavelength) and the use of focusing oscillations, which leads to an increase in resolution due to the increase in acoustic pressure in the focal zone.

The purpose of the study: the development of an ultrasonic automatic high-resolution control system. On the basis of the literature review the analysis of modern systems of ultrasonic control, their application and the principle of action is carried out. The problem of low resolution in solid materials is revealed.

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Actuality of theme
Today, wireless data technology has become an integral part of our lives. They are widely used among consumers of both conventional and professional equipment. Non-destructive testing is no exception. If we consider the existing devices and systems of non-destructive testing in which wireless data transmission is used, we will see that in the vast majority of them such technologies are used as auxiliary, and are not used for transmission of raw data about the object of control. In this work, wireless technologies are used not just to transmit reports on the state of the object of control, but with their help organized "communication" of the sensor with the primary converter and the receiving unit and information processing. In operation, such a unit is a smartphone. The smartphone as a complex device today has high computing power, a full set of the most common wireless technologies, as well as a flexible software shell. It is these advantages of this type of device allows you to use them in non-destructive testing. The essence of this work is to improve, namely the introduction of menus in English and automatic selection of maxima when determining the distance between the reference and echo pulses, the development of a flaw detector with a wireless channel for transmitting data on the status of the object to the smartphone. Where this data will be processed and displayed on the main display to decide whether there are defects in the inspected object.

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The master's dissertation  consists of an introduction, 6 chapters, conclusions and a list of references. The introduction substantiates the relevance and practical value of the chosen topic, sets the goal and objectives of the study. The first section provides an overview of the structure and disease of the eye; devices and systems for the diagnosis of eye diseases. In the second section the acoustic and electroacoustic paths were calculated, the nodes of the circuits of the electrical principle were calculated, the structural and functional schemes were developed. The third section simulates a bandpass filter. In the fourth section, the PCB was modeled and a piezoelectric transducer was developed in SolidWorks. In the fifth section, the probability of diagnosis was calculated. In the sixth chapter, a startup project for the topic of the dissertation was developed. The conclusions summarize the study and the list of references, the sources on the basis of which the study was conducted.

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Actuality of theme
Currently, the use of welded joints can be found in almost all industries. This is a very economical way of joining, which can be used to weld parts of different thicknesses. Welds are actively used in critical structures, which are often subjected to dynamic, intense and alternating loads. As a result, cracks often form in such joints, which can quickly lead to destruction, which can be accompanied by significant material damage and injury to one or more people. There is a lot of news now when the hydraulic cylinder, for example, cranes, is collapsing and negative consequences appear. Over the past few decades, the situation with the destruction of hydraulic cylinders has not changed and the percentage of such unpleasant cases does not decrease, so it is necessary to periodically monitor. The purpose of such control is the early detection of the location of the defect and its parameters, so that the responsible controller could quickly analyze the result and enter the necessary information in the control passport. In order to make the control results more reliable, it is necessary to constantly improve the methods of detecting information signals, especially for control at low signal-to-noise ratio, when noise has a strong effect on the control result, resulting in inaccurate information.

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Actuality of theme
At present, the electric field of the atmosphere is a characteristic that is poorly understood. And in vain as this feature can be very useful. At present, there are works that describe that the electric field of the atmosphere can serve as an informative parameter in finding minerals. The main characteristic of the electric field is its intensity. At the moment, the process of measuring the electric field strength of the atmosphere is quite a complex process, as in this case this parameter has very small values that are difficult to fix. And currently there is no automated system for measuring the electric field strength of the atmosphere in the field, for the study of minerals, and in general the influence of various factors on the voltage. That is why the issue of creating an automated system for measuring the electric field strength of the atmosphere in the field, as well as improving existing methods of such measurement is very important.

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  1. Zhyvkovych A. Thermal imaging system for diagnosing heat loss of buildings
  2. Masnukha D. Computer-integrated system for surface defect testing
  3. Hlushchenko M. The automated smoke detection system
  4. Baranovskyi D. Computerized eddy current testing system using matrix-type converters

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АСНК КПІ ім. Ігоря Сікорського, 2021