RU2639986C1 - Method of ultrasound tomography - Google Patents

Abstract

FIELD: radio engineering, communication.SUBSTANCE: antenna array is used. It consists of N=2transducers, a set of N/2 split signals are used as sounding devices. The transducers of the antenna array are functionally divided into two equal halves, independently and simultaneously supplied to the first N/2 of antenna array elements of N/2 split-signals, used as emitting. The second N/2 elements of the antenna array are used as receiving transducers. Ultrasonic echo-signals are received from the control object, the realizations of ultrasonic echo signals are registered, then each half of the set of transducers is repeatedly split into halves. The first halves of the converter set are used as emitting, and the latter - as receiving transducers. The Split signals are independently and simultaneously emitted and echo signals are recorded. This process is repeated until in each half one transducer remains, then all registered echo-signals are optimally filtered and optimally filtered signals are used for the point-by-point construction of an image of the internal structure of the controlled object.EFFECT: reduction of the number of radiation stages of the sounding signal required for the construction of a C-scan.3 dwg

Description

The invention relates to the field of instrumentation and non-destructive testing and can be used for thickness gauging, flaw detection and structuroscopy of various materials and products.

A known method of ultrasonic (ultrasound) control of products [Aksenov V.P. The use of radar methods of optimal detection with ultrasonic echo control. Defectoscopy, No. 2, 1982, p. 67-74, which consists in the fact that a complex-modulated probing signal is excited in a controlled product by a radiating piezoelectric transducer, echo signals reflected from the product are received by a receiving piezoelectric transducer, they are converted into a sequence of electric complex-modulated pulses, each of the pulses is optimally filtered, and the parameters are determined by the optimal filtering controlled product.

The disadvantage of this method is the low reliability and information content, which is a consequence of the lack of the ability to selectively in space in the right direction (several directions) to transmit and receive an acoustic wave, i.e. the absence of the possibility of electric scanning by the radiation pattern of the emitting (receiving) transducer, which in turn does not allow presenting the control results in the form of informative C-scans.

The closest solution in technical essence is the method of ultrasound tomography (V.A. Voronkov, I.V. Voronkov, V.N. Kozlov, A.A. Samokrutov, V.G. Shevaldykin "On the applicability of antenna array technology in solving ultrasonic problems control of hazardous production facilities "in the journal" In the World of Non-Destructive Testing ", 2011, No. 1 (51), pp. 64-70), in which, with the help of an antenna array, the control object (OK) independently by each piezoelectric transducer (PP) included in the composition of the antenna array (AR), the ultrasonic probe signal U of the _zones (t) is emitted by each PP A P independently receive the reflected ultrasonic echo signals from the OK, fix the adopted ultrasonic echo signal implementations U _echo1 (t) ... U _echoN (t) and perform point-by-point imaging of the OK internal structure by selecting amplitude-time fragments from all received echo implementations whose delay times are equal to the propagation times of ultrasonic signals from the emitting element of the AR to each visualized point OK and from it to the receiving element, summing all selected fragments corresponding to each point of the image, recording and selection display on the totalization result screen.

The disadvantage of the technical solution is the low monitoring performance, which is a consequence of the fact that to build one C-type scan, it is necessary to repeatedly emit a probe signal and receive echo signals.

The technical result of the invention is to increase the performance of ultrasonic testing by reducing the number of stages of radiation of the probe signal required to build a C-scan.

This is achieved by the fact that in the known method of ultrasonic tomography, which consists in the fact that using the antenna array to the control object, independently of each of the N piezoelectric transducers included in the antenna array, the ultrasonic probe signal U of the _zones (t) is radiated independently by each piezoelectric transducer of the antenna array receive from the control object ultrasonic echo U _echo1 (t) ... U _echoN (t), record the received ultrasonic echo signals and carry out point-by-point imaging of the internal structure of the control object, as a probe signal use a Split signal, consisting of i successively emitted radio pulses - quasiharmonics, where i≥N / 2, the antenna array contains N = 2 ^k piezoelectric transducers, where k = 2, 3, 4 ..., and the monitoring process is carried out in k stages at the first stage the control members of the N antenna array piezo PP ₁ -PP _N, functionally, to the destination is divided into two equal halves, with the first N / 2 of the transducers with PP ₁ to PP _{N / 2} is used as a radiating and PP per of them simultaneously and independently give Split signals C C ₁ ... CC _{N / 2} , and the second N / 2 piezoelectric transducers with PP _{N / 2 + 1} for PP _N are used as receivers, the echo signals from which are recorded, then at the second stage of control, each of the halves of the piezo transducers is again functionally separated once in half, piezoelectric transducers with PP ₁ -PP _{N / 4} and PP _{N / 2 + 1} according to PP _{3N / 4} are used as radiating PPs, and each of them simultaneously and independently provides Split signals CC ₁ ... CC _{N / 2} , and piezoelectric transducers with PP _{N / 4 + 1} for PP _N and with PP _{3N / 4 + 1} for PP _N are used as receiving PPs from which signals are recorded, the process of they are repeated k times, the PP ₁ piezoelectric transducer is used as the emitting one, and the PP _N piezoelectric transducer is used as the receiving transducer, and all fixed echo signals are optimally filtered before performing point-by-point imaging of the internal OK structure.

The invention is illustrated by drawings, where in FIG. 1 shows the monitoring steps during the implementation of a patented technical solution; FIG. 2 shows probing Split signals, and in FIG. 3 shows a functional diagram of an ultrasound tomograph that implements the proposed method.

The essence of the proposed method of ultrasound imaging is as follows.

For an AR consisting of N piezoelectric elements, the monitoring process is carried out for N cycles, and, for example, for N = 8 piezoelectric elements, the fixation of the complete set of received realizations of ultrasonic echo signals implies the emission of the probe signal 8 times. During the first cycle, the first piezoelectric transducer emits a probing signal, and all piezoelectric transducers from the first to eighth receive echo signals, during the second cycle the first transducer is used neither for radiation nor for receiving signals, but the second piezoelectric transducer emits a probing signal, and the second to eighth piezoelectric transducers receive echoes, and so on until the last eighth cycle, during which the eighth transducer emits and which also receives the echo.

The reduction in the number of radiation cycles is carried out due to the simultaneous and independent radiation of the probing signals by half of the total number of PPs that are part of the AR and the reception of echo signals by the other half of the PP. However, if all emitting SPs will be excited by the same sounding signal, then it is practically impossible to isolate one or another particular echo signal from the total echo signal received by each receiving SP, which is practically not possible, because the echo signals received by each receiving PP are an additive mixture of partial echo signals resulting from each of the probing signals. It is possible to divide each of the total echo signals received by one or another receiving PP into private echo signals corresponding to those emitted by one or another emitting PP, if you first mark each of the probing signals. This means that, as a set of probing signals, the signal used is not the same for all PP emitting signals, but a set of probing signals, different from each other, individually marked, and then using these signs of the labels and adjusting the filters in each of the receiving channels for each sounding signals, select private, portioned echo signals corresponding to one or another sounding signal from the total echo signal. In other words, the “signal + filter matched with it” system is organized in such a way that the filter separates the signal matched with it in the best way from the mixture with other signals and at the same time suppresses any other signal that is not matched with it. In this case, it is necessary that these sounding signals form an ensemble of signals of the required volume by the number of sounding private signals. It is proposed to organize such an ensemble of signals on the basis of a set of quasiharmonics CC ₁ ... CC _{N / 2} forming the Split signal described in RF patent No. 21266538, 09/12/1997].

Figure 1 shows the stages of control that make up the essence of the proposed technical solutions for patenting. So, for an AR consisting of N = 8 piezoelectric elements, a total of k = 3 stages of signal emission / reception is sufficient.

. Излученные в контролируемое изделие зондирующие УЗ квазигармоники Сплит-сигналов независимо отражаются от акустических неоднородностей и аддитивно поступают на входы ПП второй функциональной группы - акустические входы четырех приемных ПП₅, …ПП₈, с электрических выходов которых снимаются электрические копии акустических эхо-сигналов U₅(t), …, U₈(t). Каждый из эхо-сигналов на выходах, соответствующих ПП₅, …, ПП₈, представляет собой сумму 2^k-1=4 частных эхо-сигналов: на выходе пьезопреобразователя ПП₅ сформируется эхо-сигнал U₅(t), который приставляет собой сумму частных эхо-сигналов

, на выходе пьезопреобразователя ПП₆ сформируется эхо-сигнал U₆(t), который приставляет собой сумму частных эхо-сигналов

на выходе пьезопреобразователя ПП₈ сформируется эхо-сигнал U₈(t), который приставляет собой сумму частных эхо-сигналов

. Далее в процессе оптимальной фильтрации частные эхо-сигналы отфильтровываются один от другого и регистрируются соответствующие пьезопреобразователю ПП₅ частные сигналы

(т.е. излученный первым ПП и принятый пятым ПП),

(т.е. излученный вторым ПП и принятый пятым ПП),

(т.е. излученный третьим ПП и принятый пятым ПП),

(т.е. излученный четвертым ПП и принятый пятым ПП), соответствующие пьезопреобразователю ПП₆ сигналы

и т.д. Таким образом по завершении первого этапа контроля после комбинирования эхо-сигналов, соответствующих комбинациям излучающих - приемных ПП, порядку чередования квазигармоник в составе соответствующих Сплит-сигналов и в соответствии с процедурой обработки Сплит-сигнала, зафиксированными окажутся N²/4=16 принятых независимых реализации частных эхо-сигналов соответственно в 16-ти независимых акустических каналах, образованных парными комбинациями пьезопреобразователей ПП₁-ПП₅, ПП₁-ПП₆, ПП₁-ПП₇, ПП₁-ПП₈, ПП₂-ПП₅, ПП₂-ПП₆, ПП₂-ПП₇, ПП₂-ПП₈, …, ПП₄-ПП₈ (см. фиг. 1а)At the first stage of monitoring, the piezoelectric elements of the antenna array are functionally divided into two groups of the first stage equal in number of piezoelectric elements: the group of emitting transducers and the group of receiving transducers (see Fig. 1a). For the considered AR, consisting of N = 8 PP, each of the electrical inputs of the piezoelectric transducers of the first functional group PP ₁ ... PP ₄ are supplied respectively N / 2 = 4 Split signal

. The ultrasonic ultrasonic ultrasonic quasiharmonics of the Split signals emitted into the controlled product are independently reflected from acoustic inhomogeneities and additively arrive at the inputs of the second functional group PP - the acoustic inputs of the four receiving PP ₅ , ... PP ₈ , from the electrical outputs of which electrical copies of the acoustic echo signals U ₅ are taken ( t), ..., U ₈ (t). Each of the echo signals at the outputs corresponding to PP ₅ , ..., PP ₈ represents the sum of 2 ^k-1 = 4 private echo signals: an echo signal U ₅ (t) is generated at the output of the piezo transducer PP ₅ , which represents the sum private echoes

, at the output of the piezoelectric transducer PP ₆ , an echo signal U ₆ (t) is generated, which sets the sum of the private echo signals

at the output of the piezoelectric transducer PP ₈ , an echo signal U ₈ (t) is formed, which sets the sum of the private echo signals

. Further, in the process of optimal filtering, the private echo signals are filtered off from one another and the private signals corresponding to the piezo transducer PP ₅ are recorded

(i.e., emitted by the first PP and received by the fifth PP),

(i.e., emitted by the second PP and received by the fifth PP),

(i.e., emitted by the third PP and received by the fifth PP),

(i.e., emitted by the fourth PP and received by the fifth PP), signals corresponding to the piezoelectric transducer PP ₆

etc. Thus at the end of the first phase control after combining the echo signals corresponding to combinations of radiating - receiving PP order interlace quasi-harmonics in the composition of the relevant split signals in accordance with the processing procedure split signal fixed will be N ^2/4 = 16 taken independent implementation private echo signals, respectively, in 16 independent acoustic channels formed by paired combinations of piezo transducers PP ₁ -PP ₅ , PP ₁ -PP ₆ , PP ₁ -PP ₇ , PP ₁ -PP ₈ , PP ₂ -PP ₅ , PP ₂ - PP ₆ , PP ₂ -PP ₇ , PP ₂ -PP ₈ , ..., PP ₄ -PP ₈ (see Fig. 1a)

At the second stage, the set of piezoelectric elements of each functional group is divided in turn into two functional subgroups of the second level equal in number of PPs, thereby forming 4 subgroups of PP with 2 piezoelectric transducers in each, and the PP of the first and third subgroups are used as radiating ones (Split is fed to PP ₁ SS is the signal _1, PP ₂ is fed to split signal SS _2, on the PCB ₅ is fed split signal SS _3, PCB ₆ is fed split signal SS _4), and PP the second and fourth subgroups (PP ₃ and PP ₄ PP ₇ , PP ₈ ) - as receiving ones (see Fig. 1b). Then four sounding Split signals are fed independently to four emitting PPs, four echo signals reflected from structural inhomogeneities are recorded by receiving piezoelectric transducers. At this stage will thus still further fixed N ^2/8 = 8 independent particular implementation of ultrasonic echo signals.

At the third stage, the set of piezoelectric elements of each subgroup is divided, in turn, into two functional subgroups of the third level equal in number of PPs, thereby forming 8 subgroups of PP with 1 piezoelectric transducer in each, with PP of the first, third, fifth, and seventh subgroups (PP ₁ , PP ₃ , PP ₅ and PP ₇ ) are used as radiating, PP of the second, fourth, sixth and eighth subgroups (PP ₂ , PP ₄ , PP ₆ and PP ₈ ) as receiving ones (see Fig. 1c). At this stage will be similarly fixed even further N ^2/16 = 4 independent particular implementation of ultrasonic echo signals.

Thus, for an antenna array consisting of N = 8 piezoelectric elements, in three stages a set of echo signals in the amount of S = N * (N-1) / 2 = 28 private implementations of echo signals is detected. It should be noted that for the technical solution adopted as a prototype, the required number of steps quadratically increases with the dimension of the antenna array, while for the patented solution it only linearly. So, for an antenna array consisting of N = 16 piezoelectric transducers, to fix a complete ensemble of echo signals, it is necessary to radiate a probing signal 16 times in the case of the implementation of the prototype and 4 times in the implementation of the patented technical solution, for N = 32 the probing signal must be radiated 32 times, respectively, and 5 times.

, меняющейся от импульса к импульсу в пределах заданного частотного диапазона, определяемого полосой рабочих частот пьезопреобразователей, образующих АР (см. фиг. 2), предложенный способ ультразвуковой томографии изделий можно реализовать с помощью аналоговых или цифровых устройств различной конфигурации. Наиболее рационально все операции по формированию зондирующих сигналов и обработке принимаемых УЗ колебаний выполнять в цифровом виде. Функциональная схема УЗ томографа, реализующего предложенный способ, показана на фиг. 2. Она содержит антенную решетку 1 с N приемно-передающими ПП 2 (ПП2₁…ПП2_N), N цифроаналоговых преобразователей (ЦАП) 3 (ЦАП3₁…ЦАП3_N) и N аналого-цифровых преобразователей (АЦП) 4 (АЦП4₁…АЦП4_N), электронно-вычислительную машину (ЭВМ) 5, которая в своем составе содержит системный блок 6, монитор 7, стандартную клавиатуру 8, манипулятор 9 типа «мышь». Системный блок 6 состоит из материнской платы 10, в свою очередь состоящей из микропроцессора 11, системной магистрали 12, оперативно-запоминающего устройства 13, перепрограммируемого постоянного запоминающего устройства 14 и контроллера 15 клавиатуры. Системный блок 6 также в своем составе содержит адаптер 16 монитора, адаптер 17 портов, контроллер 18 дисков, контроллер 19 дополнительных устройств, жесткий магнитный диск 20, системное программное обеспечение 21, прикладное программное обеспечение 22.As probing signals of the ensemble of quasiharmonics of a Split signal, which is in a certain way an organized sequence of time-extended radio pulses with a carrier frequency

varying from pulse to pulse within a given frequency range, determined by the operating frequency band of the piezoelectric transducers forming an AR (see Fig. 2), the proposed method for ultrasonic tomography of products can be implemented using analog or digital devices of various configurations. It is most rational to perform all operations on the formation of sounding signals and processing received ultrasonic vibrations in digital form. A functional diagram of an ultrasound tomograph that implements the proposed method is shown in FIG. 2. It contains an antenna array 1 with N transmit-receive transmitters 2 (PP2 ₁ ... PP2 _N ), N digital-to-analog converters (DAC) 3 (DAC3 ₁ ... DAC3 _N ) and N analog-to-digital converters (ADC) 4 (ADC4 ₁ ... ADC4 _N ), an electronic computer (computer) 5, which in its composition contains a system unit 6, a monitor 7, a standard keyboard 8, a mouse type 9 manipulator. The system unit 6 consists of a motherboard 10, which in turn consists of a microprocessor 11, a system trunk 12, a random access memory 13, a reprogrammable read only memory 14 and a keyboard controller 15. The system unit 6 also includes a monitor adapter 16, a 17 port adapter, a disk controller 18, an additional device controller 19, a hard magnetic disk 20, system software 21, application software 22.

Each of the PP 2 included in the AR 1 is connected to the connection point of the analog output of the corresponding DAC 3 and the analog input of the corresponding ADC 4. The system highway 12 is connected to the digital inputs of the digital-to-analog converters 3 and the digital outputs of the analog-to-digital converters 4, by the processor 11, promptly -memory device 13, a reprogrammable read-only memory device 14, a keyboard controller 15, to the output of which a keyboard 8 is connected, a monitor adapter 16, to the output of which a monitor is connected OR 7, adapter 17, ports, disk controller 18, whose output is connected to the magnetic hard disc 20, controller 10, optional devices connected to the output of which arm 9 of the "mouse".

Antenna array 1 is installed on the control object 23 and has acoustic contact with it.

A device for implementing the method works as follows.

квазигармоник Сплит-сигналов, соответствующих рабочей полосе частот ультразвуковых ПП 2.1…2.N, которые записывается в оперативно-запоминающее устройство 13. Прикладное программное обеспечение 22 с помощью процессора 11 формирует по гармоническому закону N/2 цифровых Сплит-сигналов в виде массивов отсчетов значений амплитуды и записывает их в оперативно-запоминающее устройство 13, затем пересылает квазигармонический сигнал в цифровой форме из оперативно-запоминающего устройства 13 в цифроаналоговые преобразователи 3, которые преобразуют электрический сигнал в цифровой форме в электрические квазигармонические импульсы Сплит-сигналов в аналоговой форме и передает эти сигналы через аналоговые выходы на ультразвуковые преобразователи 1, которые в свою очередь преобразуют электрические квазигармонические сигналы в ультразвуковые квазигармонические волны и излучают данные сигналы квазигармоник в контролируемый образец.The operator manually sets the frequency values using the keyboard 8 and application software 22

quasiharmonics of Split signals corresponding to the operating frequency band of ultrasonic software 2.1 ... 2.N, which are recorded in the random-access memory 13. The application software 22 using the processor 11 generates N / 2 digital Split signals in the form of arrays of samples of values in accordance with the harmonic law amplitudes and writes them to the random access memory 13, then sends the quasi-harmonic signal in digital form from the random access memory 13 to digital-to-analog converters 3, which convert electronic ktrichesky signal in digital form into electrical pulses quasiharmonic split signals in analog form and transmits these signals via analog output at the ultrasonic transducers 1, which in turn is converted quasi-harmonic electric signals into ultrasonic waves and emit quasiharmonic data signals quasi-harmonics in a controlled pattern.

) четырех различных Сплит-сигналов CC₁…СС₄. В этот момент пьезопреобразователи 2.5, …2.8 АР 1 начинают принимать УЗ колебания из ОК 23. Эти колебания, преобразованные в электрические колебания соответственно U¹ _5-1(t), …, U¹ _8-1(t), оцифровываются в АЦП 4.4, …4.7 и записываются в ОЗУ 13 ЭВМ 5 независимо друг от друга, без каких-либо преобразований и временных сдвигов. Эти колебания регистрируются в интервале времени, превышающем с некоторым запасом τ>Т_г время распространения УЗ колебаний от каждого из излучающих ПП 2.1, …2.4 АР 1 к наиболее дальней визуализируемой точке ОК 23 и обратно - к самому удаленному от нее приемному ПП 2.5, …2.8 АР 1, причем регистрируемый сигнал представляет собой аддитивную смесь сигнала структурного шума материала ОК 23, донного эхо-сигнала и эхо-сигналов от дефектов и несплошностей материала ОК 23. После окончания регистрации эхо-сигналов первых квазигармоник Сплит-сигналов аналогичная процедура излучения - регистрации эхо-сигналов повторяется для всех остальных комбинаций квазигармоник различных частот {частоты квазигармоник в комбинации соответственно для второго такта первого этапа -

, …, для пятого такта первого этапа -

}. Таким образом, на первом этапе контроля оказываются зарегистрированными 80 частных эхо-сигналов U¹ _5-1(t), …, U¹ _8-5(t), которые в комбинациях по 5 квазигармоник, соответствующих чередованию частот квазигармоник набора зондирующих Сплит-сигналов, образуют 16 (по числу комбинаций по 2 из 4 излучающих ПП и 4 приемных ПП) первичных эхо-сигнала U¹ ₅(t), …, U¹ ₈(t), каждый из которых представляет собой комбинацию частных эхо-сигналов по следующему алгоритму: U¹ ₅(t)=U¹ _5-1(t)+…+U¹ _5-5(t), …, U¹ ₈(t)=U¹ _8-1(t)+…+U¹ _8-5(t)At the first stage of monitoring, from the outputs of the DAC 3.1, ... 3.4 at the first step, the first four piezoelectric transducers 2.1, ... 2.4 of the antenna array 1, forming a group of radiating piezoelectric transducers of the first stage, are fed, for each independently and accordingly, the first quasiharmonics (quasiharmonics frequencies in the combination of the first beat respectively

) four different Split signals CC ₁ ... CC ₄ . At this point, the piezoelectric transducers 2.5, ... 2.8 AR 1 begin to receive ultrasonic vibrations from OK 23. These vibrations, converted to electric vibrations, respectively, are U ¹ _5-1 (t), ..., U ¹ _8-1 (t), are digitized in ADC 4.4 , ... 4.7 and are recorded in RAM 13 of the computer 5 independently of each other, without any transformations and time shifts. These oscillations are recorded in a time interval exceeding with some margin τ> T _g the propagation time of ultrasonic vibrations from each of the emitting PP 2.1, ... 2.4 AR 1 to the farthest visualized point OK 23 and back to the farthest receiving PP 2.5, ... 2.8 AR 1, and the recorded signal is an additive mixture of the structural noise signal of material OK 23, the bottom echo signal and echo signals from defects and discontinuities of the material OK 23. After the registration of the echo signals of the first quasiharmonics of Split signals, the analogues Naya radiation procedure - echo-recording system is repeated for all remaining combinations of quasi-harmonics of various frequencies {quasi-harmonics frequency in combination, respectively, for the second cycle of the first phase -

, ..., for the fifth measure of the first stage -

}. Thus, at the first control stage, 80 private echo signals U ¹ _5-1 (t), ..., U ¹ _8-5 (t) are detected, which in combinations of 5 quasiharmonics corresponding to the frequency alternation of quasiharmonics of the set of probing Split signals , form 16 (by the number of combinations of 2 of 4 emitting SPs and 4 receiving SPs) primary echo signals U ¹ ₅ (t), ..., U ¹ ₈ (t), each of which is a combination of private echoes according to the following algorithm: U ¹ ₅ (t) = U ¹ _5-1 (t) + ... + U ¹ _5-5 (t), ..., U ¹ ₈ (t) = U ¹ _8-1 (t) + ... + U ¹ _8-5 (t)

At the second and third stage, the radiation of the probing signals, reception and registration of echo signals is carried out similarly to the first stage. The only exception is the method of forming groups of emitting and receiving converters. So, at the second stage, emitting piezoelectric transducers are PP 2.1, 2.2, 2.5, 2.6, and receiving piezoelectric transducers are PP 2.3, 2.4, 2.7, 2.8 of the antenna array 1, and at the third stage emitting piezoelectric transducers are PP 2.1, 2.3, 2.5, 2.7, and receiving piezoelectric transducers are PP 2.2, 2.4, 2.6, 2.8 of the antenna array 1.

After completing k = 3 cycles of probing-receiving ultrasonic vibrations in the memory of RAM 13, S = N × (N-1) / 2 = 28 realizations of the adopted realization of ultrasonic echo signals will be recorded, and then, in accordance with the algorithm contained in prototype technical solution, carry out point-by-point construction of the image of the internal structure of OK

The use of the invention provides an increase in the performance of ultrasonic testing by reducing the number of stages of radiation of the probe signal required to build a C-scan.

Claims (1)

The method of ultrasonic tomography, which consists in the fact that using the antenna array to the monitoring object, independently of each of the N piezoelectric transducers included in the antenna array, the ultrasonic probe signal U of the _zones (t) is emitted, independently each piezoelectric transducer of the antenna array is received from the monitoring object by ultrasonic echo _eho1 signals U (t) ... U _ehoN (t), fix the received ultrasonic echo signals and perform pointwise imaging the internal structure of a control object, wherein the probing signal using split Igna consisting of i sequentially emitted radio pulses - quasi-harmonics where i≥N / 2 antenna array in its composition comprises N = 2 ^k piezoelectric transducers, where k = 2, 3, 4, ..., a control process carried out for stage k on the first N control step included in the array antenna piezo PP ₁ -PP _N, functionally, to the destination is divided into two equal halves, with the first N / 2 piezo transducers with PP ₁ to PP _{N / 2} is used as a radiating PP and on each of them at the same time and independently give Split signals CC ₁ ... CC _{N / 2} , and the second N / 2 piezoelectric transducers with PP _{N / 2 + 1} for PP _N are used as receiving transducers, the echo signals from which are recorded, then at the second stage of control, each half of the set of piezoelectric transducers is functionally divided again in half and piezoelectric transducers with PP ₁ -PP _{N / 4} and PP _{N / 2 + 1} for PP _{3N / 4} are used as emitting PP, Split signals CC ₁ ... CC _{N / 2} are simultaneously and independently supplied to each of them, and piezoelectric transducers with PP _{N / 4 + 1} are PP _N and with PP _{3N / 4 + 1} over PP _N are used as receiving PPs, the signals from which are fixed, the process is repeated k times, the PP ₁ transducer is used as a radiating one, and the PP _N piezoelectric transducer is used as a receiving transducer, and, before performing point-by-point imaging of the OK internal structure, all recorded echoes are optimally filtered.

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