RU2759151C1 - Ultrahigh frequency device for determining electrophysical parameters for evaluating defects in multilayer dielectric and magnetodielectric coatings - Google Patents

Abstract

FIELD: electrical engineering.SUBSTANCE: invention relates to electrical engineering and can be used to determine electrophysical parameters, detect and evaluate defects in multilayer dielectric and magnetodielectric coatings on the metal surface when developing multilayer radio-absorbing coatings in aviation, as well as in chemical, paint and other industries. The technical result of the invention is an increase of the speed and reliability of the device by increasing the accuracy of determining the electrophysical parameters of the layers of multilayer coatings, increasing the probability of detecting interlayer defects in them, as well as the accuracy of estimating their geometric parameters (heights) and position relative to the layers of a multilayer dielectric coating. The specified technical result is achieved by the fact that a switching unit of antennas connected in series with a control unit, a synchronization unit, a movement mechanism interacting with receiving antennas, as well as a signal processing unit are introduced into the known microwave device.EFFECT: increased speed and reliability of the device by increasing accuracy of determining the electrophysical parameters of the layers of multilayer coatings.1 cl, 1 dwg

Description

The proposed invention can be used to determine electrophysical parameters, detect and evaluate defects in multilayer dielectric and magnetodielectric coatings on a metal surface when developing multilayer radio-absorbing coatings in aviation, as well as in chemical, paint and varnish and other industries.

соединен с входом соответствующей антенны, приемную антенну E-волн, приемную антенну Н-волн, последовательно соединенных блока управления, блока синхронизации, механизма перемещения, взаимодействующих с приемными антеннами, а также блока обработки сигналов.The closest in technical essence to the proposed invention is a microwave device for measuring electrophysical parameters and detecting inhomogeneities in dielectric and magnetodielectric coatings on metal [Patent RU No. 2594761, IPC ⁷ G01N 22/02, G01R 27/26, 08/20/2016. Bul. No. 23], containing a series-connected microwave generator, an antenna switching unit having N-outputs, as well as N-antennas for exciting slow surface waves, placed in the azimuthal plane in a circle, while the n-output of the switching unit, where

connected to the input of the corresponding antenna, the receiving antenna of E-waves, the receiving antenna of H-waves, the serially connected control unit, the synchronization unit, the movement mechanism interacting with the receiving antennas, as well as the signal processing unit.

The disadvantage of this device for measuring electrophysical parameters and detecting inhomogeneities in dielectric and magnetodielectric coatings on a metal is the low accuracy of determining the electrophysical parameters of multilayer coatings, a low probability of detecting interlayer defects in them, as well as a low accuracy of assessing their geometric parameters (heights) and position relative to layers of a multilayer dielectric coating due to the fact that when implementing multifrequency measurements on a device in a wide frequency band, the errors in measuring the attenuation coefficients of the surface electromagnetic wave field can differ significantly within the measurement bandwidth, due to the use of a separate generator and a detecting unit, which are not related between a feedback ring.

In addition, the device has a low response rate, since when evaluating the electrophysical parameters of multilayer coatings and evaluating interlayer defects in them, it is necessary to measure the attenuation coefficient of the surface electromagnetic wave field at each scan point of the coating under study at several frequencies in a wide frequency band, while setting the specified frequency The microwave generator and the commutation of the receiving antennas of the E- and H-waves are carried out by the operator performing the measurements.

The technical result of the proposed invention is to increase the speed and reliability of the device, increase the accuracy of determining the electrophysical parameters of the layers of multilayer coatings, increase the probability of detecting interlayer defects in them, as well as the accuracy of assessing their geometric parameters (heights) and position relative to the layers of a multilayer dielectric coating.

соединен с входом соответствующей антенны, приемную антенну E-волн, приемную антенну H-волн, последовательно соединенных блока управления, блока синхронизации, механизма перемещения, взаимодействующих с приемными антеннами, а также блока обработки сигналов, дополнительно введены, блок СВЧ, включенный последовательно между выходом СВЧ-генератора и первым входом блока коммутации антенн, блок коммутации приемных антенн и СВЧ-приемник, причем первый, второй, третий, четвертый, пятый и шестой выходы блока управления соединены со входом СВЧ-генератора, третьим входом блока СВЧ, третьим входом блока коммутации приемных антенн, вторым входом блока коммутации антенн, входом блока синхронизации и вторым входом механизма перемещения, соответственно, выходы приемных антенн Е- и Н-волн соединены с первым и вторым входом блока коммутации приемных антенн, соответственно, выход блока коммутации приемных антенн соединен со вторым входом блока СВЧ, первый и второй выходы блока СВЧ соединены со входом СВЧ-приемника и первым входом блока коммутации антенн, соответственно, первый, второй и третий выходы блока синхронизации соединены с первым входом механизма перемещения, вторым входом блока обработки сигналов и четвертым входом блока СВЧ, соответственно, а выход СВЧ-приемника соединен с первым входом блока обработки сигналов.The specified technical result is achieved by the fact that a known microwave device for measuring electrophysical parameters and detecting inhomogeneities in dielectric and magnetodielectric coatings on metal, consisting of a series-connected microwave generator, an antenna switching unit having N-outputs, and N-excitation antennas slow surface waves placed in the azimuthal plane in a circle, while the n-output of the switching unit, where

connected to the input of the corresponding antenna, the receiving antenna of E-waves, the receiving antenna of H-waves, the serially connected control unit, the synchronization unit, the movement mechanism interacting with the receiving antennas, as well as the signal processing unit, additionally introduced, the microwave unit connected in series between the output The microwave generator and the first input of the antenna switching unit, the receiving antenna switching unit and the microwave receiver, the first, second, third, fourth, fifth and sixth outputs of the control unit are connected to the input of the microwave generator, the third input of the microwave unit, the third input of the switching unit receiving antennas, the second input of the antenna switching unit, the input of the synchronization unit and the second input of the movement mechanism, respectively, the outputs of the receiving antennas of the E- and H-waves are connected to the first and second inputs of the switching unit of the receiving antennas, respectively, the output of the switching unit of the receiving antennas is connected to the second the input of the microwave unit, the first and second outputs of the microwave unit are connected to the SV input Ch-receiver and the first input of the antenna switching unit, respectively, the first, second and third outputs of the synchronization unit are connected to the first input of the movement mechanism, the second input of the signal processing unit and the fourth input of the microwave unit, respectively, and the output of the microwave receiver is connected to the first input of the unit signal processing.

The essence of the invention is as follows. The introduction of a microwave receiver and a microwave unit into the prototype device, implements a feedback loop between the microwave generator and the microwave unit by ensuring the measurement of the complex transmission coefficient (S-parameter S ₁₂ ) of the measuring signal of the microwave generator along the path: "microwave generator - microwave unit - antenna switching unit - slow surface wave excitation antenna - investigated multilayer coating - receiving antenna - receiving antenna switching unit - microwave unit "at several frequencies in one measurement cycle. In this case, the assessment of the attenuation coefficient of the surface electromagnetic wave field is carried out not by direct measurements of the electric field strengths of the surface electromagnetic wave by a separate detection unit, but by the values of the transmission coefficients S _{12 of the} measuring microwave signal along the path: "Microwave generator - microwave unit - antenna switching unit - Slow surface wave excitation antenna - investigated multilayer coating - receiving antenna - receiving antenna switching unit - microwave unit ”. This makes it possible at the hardware level to correct and eliminate systematic measurement errors when measuring the attenuation coefficient of a surface electromagnetic wave at several frequencies and, accordingly, to increase the accuracy of determining the electrophysical parameters of multilayer dielectric coatings. The implementation of measurements at all specified frequency points in one measurement cycle and the use of hardware switching of receiving antennas, allows to increase the speed and reliability of the device, as well as to reduce the measurement time when inspecting multilayer dielectric coatings.

The diagram of a microwave device for determining the electrophysical parameters and assessing defects in multilayer dielectric and magnetodielectric coatings is shown in Fig., Where the following designations are introduced: 1 - switching unit of receiving antennas, 2 - receiving antenna of E-waves, 3 - receiving antenna of H-waves, 4 - movement mechanism, 5 - microwave generator, 6 - microwave unit, 7 - antenna switching unit, 8 - N-antennas for excitation of slow surface waves, located in the azimuthal plane in a circle, 9 - investigated multilayer coating, 10 - microwave receiver , 11 - control unit, 12 - synchronization unit, 13 - signal processing unit.

The microwave generator 5 is a software-controlled source of the microwave measuring signal and is designed to power the antennas for the excitation of slow surface waves.

The microwave unit 6 is a measuring microwave path of the device and is designed to separate the signals of the incident and reflected waves from the antennas of excitation of slow surface waves 8, as well as the passing wave along the path: waves - investigated multilayer coating - receiving antenna - receiving antenna switching unit - microwave unit ”.

k=1, 2, …, L.The microwave receiver 10 is designed to measure, according to the signals of the incident, reflected and transmitted waves coming from the microwave unit, the transmission coefficient S _{12 of the} measuring signal from the microwave generator 5 along the path: “microwave generator - microwave unit - antenna switching unit - transmitting antenna - investigated multilayer coating - receiving antenna - switching unit of receiving antennas - microwave unit ", for all specified frequencies

k = 1, 2, ..., L.

Microwave generator 5, microwave unit 6 and microwave receiver 10 can be implemented on the basis of a vector electrical circuit analyzer, for example, type HP8720 [Danilin A.A. Microwave measurements. M .: Radiotekhnika, 2008. 183 s, S. 76-80].

Control unit 11 is designed for:

- automatic switching of the outputs of the receiving antenna switching unit 1 and the antenna switching unit for exciting slow surface waves 7;

- automatic setting of the operating frequency of the microwave generator 5;

- generating a control signal to turn on the microwave unit 6;

- generating a control signal to turn on the synchronization unit 12;

- generating signals for automatic control of the movement mechanism 4.

- formation of a delay signal for the movement mechanism 4, when measuring at several frequencies.

Control unit 11 can be implemented on the basis of a personal electronic computer (PC) and a multifunctional PXI input-output module of the PXI-6229 type manufactured by National Instruments [Device specification NI 6229 / https://www.ni.com/pdf/manuals/375204c .pdf], which has 48 bidirectional digital channels. As the software of the control unit 11, for example, the LabView development environment [Official site of the Lab View development environment https://www.ni.com/ru-ru/shop/labview.html] can be used.

N-antennas excitation of slow surface waves 8, located in the azimuthal plane in a circle, are inherent in the analogue.

The unit for switching N-antennas for excitation of slow surface waves 7 and the unit for switching for receiving antennas 1 are inherent in the unit for switching antennas for excitation of slow surface waves of an analogue and can be implemented, for example, on the basis of microstrip ferrite Y-circulators [S. 89-102, Dmitrenko G.V. Design of microwave stripline devices: Textbook. allowance / G.V. Dmitrienko; Ministry of Education Ros. Federation. Ulyan, state tech. un-t. Ulyanovsk: UlSTU, 2001. 112 p.], Connected according to the diagram-forming matrix scheme of Butler [S. 9, Electrically Scanned Antenna Arrays / Proceedings of the Institute of Electrical and Electronic Engineers. Thematic issue. Translated from the English journal Proceedings of the IEEE Vol. 56, No. 11, November 1968. Ed. I.B. Abramova, L.S. Benenson. M. Mir. 376 S.], a decoder using microcircuits of the SN74LS145N type according to one of the variants of the schemes given in [Ryumik SM. 1000 and one microcontroller circuit. Issue 2. M .: Publishing house "Dodeka-XXI". 2011. S. 210-212] and controlled gates on pin-diodes.

Receiving antennas of E and H waves, as well as the mechanism of their movement 4 are inherent in the analogue. In this case, the movement mechanism can be implemented, for example, on the basis of a system of three stepper motors [J. Williams Programmable robots. We create a robot for our home workshop. M .: NT Press, 2006. S. 127-167]. Each of them moves the receiving antenna of the E and H waves along the X, Y, Z coordinates, respectively. The mechanism for moving the receiving antennas can be built on the basis of High-Resolution Type PK246PB stepper motors from Orientalmotor and L297, L298N and LMD18T245 microcircuits [J. Williams Programmable robots. We create a robot for our home workshop. M .: NT Press, 2006. S. 127-167].

The stepper motors of the movement mechanism 4 are controlled from the control unit 11 by sending control signals from the PXI-6229 data acquisition board.

k=1, 2, …, L. Блок синхронизации, например, может быть реализован на основе микроконтроллера. При этом синхронизация осуществляется путем одновременной подачей цифрового кода с портов ввода-вывода блока управления 11 на механизм перемещения 4 и блок СВЧ 6. Одновременная подача сигналов на порты ввода-вывода микроконтроллера устройства синхронизации 12 осуществляется на основе собственного внутреннего тактового сигнала блока управления 11, на основе многофункционального модуля ввода-вывода PXI типа PXI-6229 компании National Instruments [Device specification NI 6229 / https://www.ni.com/pdf/manuals/375204c.pdf], имеющего 48 двунаправленных цифровых канала.The synchronization unit 12 is designed to simultaneously turn on the microwave unit 6 and the mechanism for moving the receiving antennas 4, when measuring at frequencies

k = 1, 2, ..., L. The synchronization unit, for example, can be implemented on the basis of a microcontroller. In this case, synchronization is carried out by simultaneously supplying a digital code from the input-output ports of the control unit 11 to the movement mechanism 4 and the microwave unit 6. Simultaneous supply of signals to the input-output ports of the microcontroller of the synchronization device 12 is based on the own internal clock signal of the control unit 11, on based on a multifunctional PXI I / O module of the PXI-6229 type from National Instruments [Device specification NI 6229 / https://www.ni.com/pdf/manuals/375204c.pdf], which has 48 bidirectional digital channels.

для всех заданных частот

k=1, 2, …, L, определения по ним электрофизических параметров и оценки дефектов в исследуемом многослойном диэлектрическом или магнитодиэлектрическом покрытии по методике приведенной в [Казьмин А.И., Федюнин П.А. Восстановление структуры электрофизических параметров многослойных диэлектрических материалов и покрытий по частотной зависимости коэффициента ослабления поля поверхностной электромагнитной волны // Измерительная техника, 2019. №9. С. 39-45; Казьмин А.И., Федюнин П.А. Контроль дефектов в многослойных диэлектрических материалах СВЧ-методом // Заводская лаборатория. Диагностика материалов, 2020. Том 86. №2. С. 37-43].Signal processing unit 13 is designed to determine the attenuation coefficients of the surface slow electromagnetic wave along the normal (Y-axis) to the coating surface

for all given frequencies

k = 1, 2, ..., L, determination of electrophysical parameters from them and evaluation of defects in the investigated multilayer dielectric or magnetodielectric coating according to the method described in [Kazmin A.I., Fedyunin P.A. Reconstruction of the structure of the electrophysical parameters of multilayer dielectric materials and coatings from the frequency dependence of the attenuation coefficient of the field of the surface electromagnetic wave // Measuring equipment, 2019. No. 9. S. 39-45; Kazmin A.I., Fedyunin P.A. Control of defects in multilayer dielectric materials by the microwave method // Factory laboratory. Diagnostics of materials, 2020. Volume 86. No. 2. S. 37-43].

и вычисленными теоретическими значениями коэффициентов затухания

поля поверхностной электромагнитной волны на частотах

k=1, 2, …, L [Казьмин А.И., Федюнин П.А. Восстановление структуры электрофизических параметров многослойных диэлектрических материалов и покрытий по частотной зависимости коэффициента ослабления поля поверхностной электромагнитной волны // Измерительная техника, 2019. №9. С. 39-45; Казьмин А.И., Федюнин П.А. Контроль дефектов в многослойных диэлектрических материалах СВЧ-методом // Заводская лаборатория. Диагностика материалов, 2020. Том 86. №2. С. 37-43]:The signal processing unit 13 can be implemented, for example, on the basis of a personal electronic computer and a subroutine that implements the determination of electrophysical parameters and the assessment of interlayer defects of a multilayer coating at a given measurement point according to a technique that consists in minimizing the objective function constructed from the discrepancy between the experimentally obtained

and the calculated theoretical values of the damping coefficients

fields of surface electromagnetic waves at frequencies

k = 1, 2,…, L [Kazmin A.I., Fedyunin P.A. Reconstruction of the structure of the electrophysical parameters of multilayer dielectric materials and coatings from the frequency dependence of the attenuation coefficient of the field of the surface electromagnetic wave // Measuring equipment, 2019. No. 9. S. 39-45; Kazmin A.I., Fedyunin P.A. Control of defects in multilayer dielectric materials by the microwave method // Factory laboratory. Diagnostics of materials, 2020. Volume 86. No. 2. S. 37-43]:

- расстояние между экспериментально полученными

и вычисленными теоретическими значениями

коэффициентов затухания поля поверхностной электромагнитной волны в области допустимых значений

- частота зондирующего сигнала;

- 3n-мерный вектор описывающий электрофизические параметры n-слойного покрытия,

- комплексные относительные диэлектрические и магнитные проницаемости, b_2n+1, …, b_3n - толщины слоев материала;

- вектор геометрических параметров дефектов (величин отслоений и расслоений в покрытии);where

- the distance between the experimentally obtained

and calculated theoretical values

attenuation coefficients of the surface electromagnetic wave field in the range of permissible values

- the frequency of the probing signal;

- 3n-dimensional vector describing the electrophysical parameters of the n-layer coating,

- complex relative dielectric and magnetic permeabilities, b _{2n + 1} ,…, b _3n - thickness of material layers;

- vector of geometric parameters of defects (values of delamination and delamination in the coating);

в блоке обработке сигналов 13 можно определить по формуле [С. 122, Федюнин П.А.. Казьмин А.И. Способы радиоволнового контроля параметров защитных покрытий авиационной техники. М.: Физматлит. 2013. 189 с.], заменив в ней значения напряженности электрического поля поверхностной электромагнитной волны на измеренные значения коэффициентов передачи S₁₂:Determination of the experimental attenuation coefficients of the surface slow electromagnetic wave along the normal (Y-axis) to the coating surface

in the signal processing unit 13 can be determined by the formula [C. 122, Fedyunin P. A. Kazmin A. I. Methods of radio wave control of the parameters of protective coatings of aviation equipment. Moscow: Fizmatlit. 2013.189 s.], Replacing the values of the electric field strength of the surface electromagnetic wave with the measured values of the transmission coefficients S ₁₂ :

- коэффициент передачи по пути: «СВЧ-генератор - блок СВЧ - блок коммутации антенн - антенна возбуждения медленной поверхностной волны - исследуемое многослойное покрытие - приемная антенна - блок коммутации приемных антенн - блок СВЧ», при расстоянии приемной антенны от поверхности у, на частоте

- коэффициент передачи по пути: «СВЧ-генератор - блок СВЧ - блок коммутации антенн - антенна возбуждения медленной поверхностной волны - исследуемое многослойное покрытие - приемная антенна - блок коммутации приемных антенн - блок СВЧ» при расстоянии приемной антенны от поверхности у+r, на частоте

.where r is the distance (step) between the measurement points;

- transmission coefficient along the path: "microwave generator - microwave unit - antenna switching unit - antenna excitation of a slow surface wave - investigated multilayer coating - receiving antenna - receiving antenna switching unit - microwave unit", at a distance of the receiving antenna from the surface y, at a frequency

- transmission coefficient along the path: "microwave generator - microwave unit - antenna switching unit - slow surface wave excitation antenna - investigated multilayer coating - receiving antenna - receiving antenna switching unit - microwave unit" at a distance of the receiving antenna from the surface y + r, at frequency

...

The proposed microwave device for determining electrophysical parameters and assessing defects in multilayer dielectric and magnetodielectric coatings operates as follows.

k=1, 2, …, L, где L - количество частот, координаты перемещения приемных антенн Е и Н-волн в пределах зоны действия каждой из N-антенн возбуждения медленных поверхностных волн, а также загружается управляющая программа. Начинается последовательное выполнение управляющей программы блоком управления 11.Before starting the measurements, the initial data is entered into the control unit 11: the specified operating frequencies

k = 1, 2, ..., L, where L is the number of frequencies, the coordinates of the movement of the receiving antennas E and H-waves within the coverage area of each of the N-antennas for the excitation of slow surface waves, and the control program is also loaded. The sequential execution of the control program by the control unit 11 begins.

The signal from the control unit 11 sets the first of L operating frequencies ƒ _{1 of the} microwave generator 5. From the output of the microwave generator, the measuring signal at a frequency ƒ _{1 is} fed to the first input of the microwave unit 6.

The measuring signal of the microwave generator from the second output of the microwave unit 6 is fed to the antenna switching unit 7. The first output of the antenna switching unit 7 is activated by supplying a digital code corresponding to the first output from the fourth output of the control unit 11. In this case, the first of the N-antennas excitation of slow surface waves 8 is included in the work.

The first of the N-antennas for the excitation of slow surface waves in the investigated multilayer coating is the excitation of an E- or H-type surface electromagnetic wave at a frequency of the measuring signal ƒ ₁ . The corresponding receiving antenna (E or H waves) receives the measuring signal of the surface electromagnetic wave at a frequency ƒ ₁ . From the control unit 11, the corresponding input of the switching unit of receiving antennas 1 is switched on and the signal from the corresponding receiving antenna is fed to the second input of the microwave unit 6, to select the signal of the passing wave along the path: “microwave generator - microwave unit - antenna switching unit - transmitting antenna - investigated multilayer coating - receiving antenna - receiving antenna switching unit - microwave unit ”.

In the microwave unit 6, the signals of the incident, reflected and transmitted waves are separated. Then they enter the microwave receiver 10, where the transmission coefficient S _{12 of the} wave is estimated along the path: "Microwave generator - microwave unit - antenna switching unit - excitation antenna of a slow surface wave - investigated multilayer coating - receiving antenna - receiving antenna switching unit - unit Microwave "at a frequency ƒ ₁ and transmission of the obtained value to the signal processing unit 13 for storage and further processing.

After completion of the measurement of the transmission coefficient S ₁₂ at a frequency ƒ ₁ , they are measured for all specified frequencies S ₁₂ k = 1, 2, ..., L.

According to the signal from the control unit 11 by the movement mechanism 4, the corresponding receiving antenna is moved along the normal upward above the coating surface at a distance d higher than the initial value (y + d) and a similar cycle of measurements of the transmission coefficients S _{12 is} performed for all specified frequencies ƒ _k = 1, 2 , ..., L.

In this case, the synchronization unit 12 generates a digital code for synchronized simultaneous activation of the microwave unit 6 and the movement mechanism 4.

k=1, 2, …, L запоминаются в блоке обработке сигналов 13, и по ним производится определение экспериментальных коэффициентов затухания поля поверхностной медленной электромагнитной волны по нормали (ось Y) к поверхности покрытия

для всех заданных частот

k=1, 2, …, L.The values of the transmission coefficients S ₁₂ for all given frequencies

k = 1, 2, ..., L are stored in the signal processing unit 13, and they are used to determine the experimental attenuation coefficients of the surface slow electromagnetic wave along the normal (Y-axis) to the coating surface

for all given frequencies

k = 1, 2, ..., L.

k=1, 2, …, L, в блоке обработке сигналов 13 производится определение электрофизических параметров и оценка межслойных дефектов многослойного покрытия в данной точке измерения.Based on the obtained series of experimental values of the damping coefficients

k = 1, 2, ..., L, in the signal processing unit 13, the electrophysical parameters are determined and the interlayer defects of the multilayer coating are evaluated at this measurement point.

k=1, 2, …, L, и определение по ним электрофизических параметров и оценка межслойных дефектов многослойного покрытия.Thus, at a given point of measurement of a multilayer coating in one cycle of operation of the device, a high-precision multifrequency measurement of the attenuation coefficients of the field of a surface electromagnetic wave is realized

k = 1, 2, ..., L, and determination of the electrophysical parameters from them and assessment of interlayer defects of a multilayer coating.

To determine the electrophysical parameters and assess defects at all specified points on the surface of the multilayer coating under study, the second output of the antenna switching unit is activated by supplying a digital code corresponding to the second output from the control unit 11. In this case, the second of the N-antennas for excitation of surface waves is connected to operation, and the first is turned off and the algorithm of the control program, discussed above, is repeated only for the second antenna for excitation of surface waves.

блока коммутации антенн производится последовательное включение остальных N-антенн возбуждения поверхностных волн. Алгоритм работы устройства для каждой из N антенн возбуждения поверхностных волн аналогичен, рассмотренным выше.Similar to activation of outputs

the antenna switching unit sequentially turns on the remaining N-antennas for excitation of surface waves. The operation algorithm of the device for each of the N antennas for excitation of surface waves is similar to those discussed above.

k=1, 2, …, L, в одном цикле измерения, что позволяет повысить быстродействие и надежность устройства, расширить его функциональные возможности, за счет возможности оценки электрофизических параметров многослойных покрытий, повысить точность их определения, а также повысить вероятность обнаружения в них межслойных дефектов, точность оценки их геометрических параметров (высот) и положения относительно слоев многослойного диэлектрического покрытия.Thus, the device implements a synchronized hardware-software determination of the attenuation coefficients of the surface electromagnetic wave field at several frequencies

k = 1, 2, ..., L, in one measurement cycle, which makes it possible to increase the speed and reliability of the device, expand its functionality, due to the possibility of assessing the electrophysical parameters of multilayer coatings, increase the accuracy of their determination, and also increase the probability of detecting interlayer defects, the accuracy of assessing their geometric parameters (heights) and position relative to the layers of a multilayer dielectric coating.

Claims (1)

A microwave device for measuring electrophysical parameters and detecting inhomogeneities in dielectric and magnetodielectric coatings on a metal, consisting of a series-connected microwave generator, an antenna switching unit with N-outputs, and N-antennas for exciting slow surface waves located in the azimuthal plane along circle, while the n-output of the switching unit, where

connected to the input of the corresponding antenna, the receiving antenna of E-waves, the receiving antenna of H-waves, the serially connected control unit, the synchronization unit, the movement mechanism interacting with the receiving antennas, as well as the signal processing unit, characterized in that the microwave unit included in series between the output of the microwave generator and the first input of the antenna switching unit, the receiving antenna switching unit and the microwave receiver, the first, second, third, fourth, fifth and sixth outputs of the control unit are connected to the input of the microwave generator, the third input of the microwave unit, the third the input of the switching unit of receiving antennas, the second input of the switching unit of antennas, the input of the synchronization unit and the second input of the movement mechanism, respectively, the outputs of the receiving antennas of E- and H-waves are connected to the first and second inputs of the switching unit of receiving antennas, respectively, the output of the switching unit of receiving antennas connected to the second input of the microwave unit, the first and second outputs of the microwave unit connected to the input of the microwave receiver and the first input of the antenna switching unit, respectively, the first, second and third outputs of the synchronization unit are connected to the first input of the movement mechanism, the second input of the signal processing unit and the fourth input of the microwave unit, respectively, and the output of the microwave receiver is connected to the first input of the signal processing block.

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