JP2014173939A - Ultrasonic flaw detection method and ultrasonic flaw detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detection device capable of displaying a high S/N ratio signal though being inexpensive.SOLUTION: The ultrasonic flaw detection device includes: an ultrasonic sensor 100; a transmitting/receiving part 101; a control part 102; and a display part 103. An ultrasonic vibrator 100A of the ultrasonic sensor 100 receives a received wave from the object to be inspected and transmits the received wave to a plurality of receivers 101B connected to each other in parallel. The plurality of receivers 101B subjects the received wave to analogue/digital conversion processing and transmits the converted waves to the control part 102. In the plurality of receivers 101B, an electric noise N is generated and overlapped in a process in which an electric signal S is processed. If M is an integer of 2 or higher, the electric noise N becomes √ M times by addition of M times signal measurement. The electric signal S is increased M times by the addition of M times signal measurement, and as a result, an S/N ratio is improved by √ M times.

Description

  The present invention relates to an ultrasonic flaw detection method and an ultrasonic flaw detection apparatus.

  In the ultrasonic flaw detection method for inspection of various structural materials, etc., an ultrasonic signal consisting of a single element is conventionally used for transmission and reception of ultrasonic waves, and the ultrasonic signal reflected by defects inside the inspection target. The defect is detected based on the propagation time and the position of the ultrasonic sensor.

  At this time, by moving the ultrasonic sensor, the position where the reflected wave from the defect is obtained is obtained, and the reflection from the bottom surface (boundary surface far from the sensor) or surface (boundary surface near the sensor) to be inspected. The dimension of the defect is identified by integrating the difference between the reception times of the waves and the sound speed of the material (the speed of sound in the material to be inspected).

  This method is simple and clear in principle, and the apparatus is relatively simple. Therefore, this method is often used for general defect inspection, but it requires a high S / N ratio so that the received signal of the reflected waveform can be confirmed. It was.

  As a method for increasing the S / N ratio, there is a method in which signals are repeatedly measured and added or integrated. By this method, the signal strength is improved by a multiple of the repeated number of times. However, the power spectral density of white noise, which follows the Gaussian distribution and can almost ignore frequency dependence, such as thermal noise and shot noise, increases by a multiple of the square root of the number of repetitions. This is improved by a multiple of the square root of the number of times (for example, see Non-Patent Document 1).

  For this reason, a method is known in which the received signal having a reflected waveform is repeatedly stored in a memory using this, and the stored data is subjected to addition averaging or integration averaging to reduce white noise and improve the SN ratio.

  On the other hand, in Patent Document 1, when ultrasonic waves are transmitted / received to / from the inspection object from a part of the piezoelectric vibration elements of the array type ultrasonic sensor, the piezoelectric vibration element used for transmission and the piezoelectric vibration element used for reception While switching the combination, with the focus of ultrasonic transmission / reception set to one point, change only the propagation path of ultrasonic waves and record multiple reflection signals, and add or average these multiple reflection signals, Noise superimposed on the path of ultrasonic waves is reduced. This processing is electronically scanned in the array arrangement direction and further mechanically scanned in the normal direction of the array arrangement, thereby generating a high S / N ratio inspection image using a reflection signal from the inside of the inspection target. Is described.

Co-authored by Nobunori Oura and Matsuo Sekine “Electrical and Electronic Measurement” pages 35-41 April 6, 1992

JP 2007-263780 A

  In the conventional ultrasonic flaw detection method for various structural materials to be inspected, an ultrasonic signal consisting of a single element is used for transmission and reception of ultrasonic waves, and the ultrasonic signal reflected by defects inside the inspection target The defect is detected based on the propagation time and the position of the ultrasonic sensor.

  The method in the prior art is simple and clear in operation principle and relatively simple in apparatus, and is often used for general defect inspection. However, the method has a high S / N ratio so that a reflected waveform received signal can be confirmed. It was necessary.

  However, in the ultrasonic inspection of Non-Patent Document 1, it is possible to improve the S / N ratio, but due to repeated measurement, a delay time is generated until display on the screen, and the real-time property is deteriorated.

  In addition, in the ultrasonic inspection of Patent Document 1, it is necessary to control a plurality of steps using an expensive array type ultrasonic sensor, which is not only expensive but also has reduced real-time properties.

  An object of the present invention is to realize an ultrasonic flaw detection method and an ultrasonic flaw detection apparatus that can display a signal with a high S / N ratio in real time while being inexpensive.

  In order to achieve the above object, the present invention is configured as follows.

  In the ultrasonic flaw detection method, an electrical signal is transmitted to an ultrasonic transducer to generate an ultrasonic wave, an ultrasonic wave is transmitted from the ultrasonic transducer to an object to be inspected, and a reflected wave from the object to be inspected is transmitted to the ultrasonic wave. The ultrasonic wave is received by the ultrasonic transducer, the received reflected wave is converted into an electric signal by the ultrasonic transducer, and the converted electric signal is transmitted to a plurality of receivers connected in parallel to each other. , Convert to digital signal. Further, the digital signals converted by the plurality of receivers are added or averaged to each other, imaged to display the processed signal on the display unit, and the imaged signal is displayed on the display unit. To do.

  Further, in the ultrasonic flaw detection apparatus, an ultrasonic transducer that transmits ultrasonic waves and receives reflected waves from the test object, a drive signal generator that generates a drive signal for the ultrasonic transducer, A plurality of receivers which are connected in parallel to each other and which convert reflected waves from the object to be inspected received by the ultrasonic transducer into digital signals. Furthermore, an adder that performs addition processing or addition averaging processing on the digital signals converted by the plurality of receivers, a control processing unit that performs imaging processing of the digital signals processed by the adder, and the control processing unit And a display unit for displaying a signal subjected to image processing.

  According to the present invention, it is possible to realize an ultrasonic flaw detection method and an ultrasonic flaw detection apparatus that can display a signal with a high S / N ratio in real time while being inexpensive.

1 is a schematic configuration of an ultrasonic flaw detector according to Embodiment 1 of the present invention. It is a figure which shows the modification of Example 1 of this invention. It is a schematic block diagram of the ultrasonic flaw detector by Example 2 of this invention. It is a figure which shows the modification of Example 2 of this invention. It is a schematic block diagram of the ultrasonic flaw detector by Example 3 of this invention. It is a schematic block diagram of the ultrasonic flaw detector by Example 4 of this invention. It is a schematic block diagram of the ultrasonic flaw detector by Example 5 of this invention. It is a figure which shows the modification of Example 5 of this invention. It is a flowchart which shows the flaw detection content of the ultrasonic flaw detector by Example 1 of this invention. It is a flowchart which shows the flaw detection content of the ultrasonic flaw detector by Examples 2-5 of this invention. It is an example of the display screen of an ultrasonic flaw detector when the present invention is not applied. It is an example of the display screen of an ultrasonic flaw detector when the present invention is applied.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

Example 1
FIG. 1 is a schematic configuration of an ultrasonic flaw detector according to Embodiment 1 of the present invention.

  In FIG. 1, the ultrasonic flaw detection apparatus includes an ultrasonic sensor 100, a transmission / reception unit 101, a control unit 102, and a display unit 103.

  The flaw detection target is, for example, a scratch or a defect in an object (inspected object). In the case of nondestructive inspection using ultrasonic waves, it is possible to obtain the presence or absence of a flaw or a defect and the position of a flaw or a defect if there is a flaw or a defect based on time information transmitted and received.

  Here, the ultrasonic flaw detector according to Embodiment 1 of the present invention can obtain information on a flaw detection target with a high SN ratio.

  The ultrasonic sensor 100 has a single ultrasonic transducer 100A having a structure in which a piezoelectric material is mainly sandwiched between electrodes. The transmission / reception unit 101 includes a pulsar (drive signal generator) 101A and a plurality of receiver circuits (receivers) 101B. The pulser 101A applies a voltage to the ultrasonic transducer 100A of the ultrasonic sensor 100 in order to generate ultrasonic waves. Thereby, an ultrasonic wave is transmitted from the ultrasonic transducer 100A and propagates through an object that is an inspection object. The ultrasonic wave is reflected by the flaw detection target, propagates again through the object, and reaches the ultrasonic transducer 100A. The plurality of receivers 101B connected in parallel with each other converts the ultrasonic waves received by the ultrasonic transducer (ultrasonic probe) 100A into analog / digital signals to obtain reception signals.

  The control unit 102 includes a control / processing computer 102A, a storage device 102B, and an adder circuit (adder) 102C. The electrical signals processed by the plurality of receivers 101B are transmitted to the addition circuit 102C and subjected to addition processing or addition averaging processing. The control / processing computer 102A records and processes the signal received from the addition circuit 102C. The storage device 102B holds information on received signals and information on the number of receivers 101B used.

  In addition, the display unit 103 includes an input unit 103A in which the number of receivers 101B to be used can be entered or selected, and an output unit 103B that displays a received signal from the inspection object and an inspection image. The output unit 103B includes a first display unit 103C that displays a signal processed by the control / processing computer 102A and a second display unit 103D that displays an image of the inspection result.

  First, the control / processing computer 102A switches the connection between the control processing computer 102A, the pulser 101A, and the receiver 101B by a switching control function when transmitting and receiving ultrasonic waves and recording a reflected signal from the flaw detection target. The ultrasonic transducer | vibrator 100A of the ultrasonic sensor 100 which received the transmission signal from the pulsar 101A transmits an ultrasonic wave by a piezoelectric effect. The ultrasonic wave reflected by the flaw detection target that is the inspection target is received by the ultrasonic transducer 100A of the ultrasonic sensor 100 and converted into a signal by the piezoelectric effect.

  Next, the received signal is sent to a plurality of receivers 101B and subjected to analog / digital conversion processing. The number of receivers 101 </ b> B is determined in advance by an operator or the like at the input unit 103 </ b> A of the display unit 103.

  Here, the used number of the plurality of receivers 101B increases as the number increases. In the receiver 101B, electric noise N is generated and superimposed in the process of processing the electric signal S. The electrical noise N is, for example, white noise, and it is known that when M is an integer of 2 or more, it becomes √M times by adding M signal measurements.

  On the other hand, the electrical signal S increases M times by the addition of M signal measurements, and as a result, the SN ratio is improved by √M times.

  Therefore, the SN ratio can be improved by a factor of √M by providing a plurality of receivers 101B connected in parallel to each other in the first embodiment of the present invention.

  The electric signal subjected to the analog / digital conversion processing by the receiver 101B is sent to the addition circuit 102C and added. At this time, the same S / N ratio improvement effect can be obtained even by addition averaging. Then, the added signal is sent to the storage device 102B and stored.

  11 and 12 are diagrams illustrating examples of display screens of the ultrasonic inspection apparatus. In the case where a plurality of receivers 101B are provided, for example, when only one receiver 101B is selected, the temporal change in signal strength is as shown in FIG. As shown in FIG. 11, it is reflected by a flaw detection target such as a flaw or a defect and appears as a waveform. In addition, a reflected wave derived from the structure of the object to be detected appears as a waveform. In addition, only electrical noise appears in a time zone that is not affected by the reflected wave.

  In the example shown in FIG. 11, there is an SN ratio that can confirm the peak value of the signal, but the electrical noise that is high frequency is large.

  On the other hand, when a plurality of receivers 101B are used, for example, when 16 receivers 101B are selected, the temporal change in signal strength is as shown in FIG. 12, the electrical noise that is high frequency is reduced, and the SN ratio is Compared to the example of FIG.

  Thus, electrical noise can be reduced by using a plurality of receivers 101B.

  Next, a flaw detection operation using the ultrasonic flaw detector according to Embodiment 1 of the present invention will be described with reference to FIG.

  FIG. 9 is a flowchart showing a flaw detection operation by the ultrasonic flaw detector according to Embodiment 1 of the present invention.

  In step S10 of FIG. 9, the operator inputs or selects information on the number of receivers used by the input unit 103A.

  Next, in step S20, information on the transmission signal is transmitted from the control / processing computer 102A to the pulsar 101A, and an electric signal is applied from the pulsar 101A to the ultrasonic transducer 100A. Then, ultrasonic waves are transmitted from the ultrasonic transducer 100A to the inspection object.

  Next, in step S30, the ultrasonic wave reflected by the inspection object is received by the ultrasonic transducer 100A, the received ultrasonic wave is converted into an electric signal, and the electric signal is selected in step S10. To the receiver 101B. It is assumed that the control processing computer 102A is operating or not operating any of the plurality of receivers 101B in accordance with the number of receivers used by the input unit 103A.

  In step S40, the plurality of receivers 101B selected in step S10 perform analog / digital conversion processing on the transmitted electrical signals in parallel.

  In step S50, the signals processed in parallel in step S40 are transmitted to the adding circuit 102C, added by the adding circuit 102C, and transmitted to the control / processing computer 102A.

  In step S60, the control / processing computer 102A transmits the signal sent from the addition circuit 102C as an image signal to the output unit 103B, and displays the waveform on the output unit 103B.

  As described above, according to the first embodiment of the present invention, signals from a single ultrasonic transducer 100A are simultaneously subjected to analog-digital conversion processing by a plurality of receivers 101B and added by an adder circuit 102C. Because it is configured to process, in ultrasonic flaw detection, it is necessary to drive the ultrasonic transducer multiple times, do not need to perform repeated measurement, and perform flaw detection inspection of the inspection object in almost real time without a large delay time. Can do.

  Further, the ultrasonic transducer 100A uses a single transducer, and it is not necessary to use an expensive array type ultrasonic sensor. Therefore, it is possible to realize an ultrasonic flaw detection method and an ultrasonic flaw detection apparatus that can display a signal with a high S / N ratio in real time while being inexpensive.

  Here, in the example shown in FIG. 1, the ultrasonic transducer 100A and the plurality of receivers 101B are connected using a plurality of signal lines. However, as shown in FIG. 2, a single input signal line is used. It is also possible to use a connector 106 having a distribution unit that distributes the signal to a plurality of parallel output signal lines and a connection unit that uses a single input signal line as a single output signal.

(Example 2)
Next, an ultrasonic flaw detector according to Embodiment 2 of the present invention will be described. FIG. 3 is a schematic configuration diagram of an ultrasonic flaw detector according to Embodiment 2 of the present invention.

  3, the transmission / reception unit 101, the control unit 102, and the display unit 103 have the same configuration as that of the first embodiment shown in FIG. The difference between the first embodiment and the second embodiment is that an electrical matching circuit 104 is provided in the ultrasonic sensor 100 of the second embodiment, and an adjustment unit 107 that adjusts the electrical matching circuit 104 is provided. . The electrical matching circuit 104 is composed of electronic components such as general resistors, capacitors, and coils. By using the variable resistors, variable capacitors, and variable coils in combination, the electrical matching circuit 104 is adapted to the frequency band to be matched. Setting is possible. Thereby, electrical matching between the ultrasonic transducer 100A and the plurality of receivers 101B connected in parallel to each other is possible.

  Next, a flaw detection operation using the ultrasonic flaw detector according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 10 is a flowchart showing the contents of flaw detection by the ultrasonic flaw detector according to Embodiment 2 of the present invention.

  Steps S10 to S60 in FIG. 10 are the same as those in the flowchart shown in FIG.

  In step S70 of FIG. 10, the operator determines whether the sensitivity is sufficient based on the waveform displayed on the first display unit 103D of the output unit 103B. If not sufficient, in step S71, the operator adjusts the adjustment unit 107 with the electrical impedance of the plurality of receivers 101B connected in parallel to the ultrasonic transducer 100A by the electric matching circuit 104 provided in the ultrasonic sensor 100. Use to match. After matching the electrical impedance, the process returns to step S20, the ultrasonic sensor 100 again transmits ultrasonic waves, and steps S20 to S70 are repeated.

  Here, whether or not the sensitivity is sufficient is determined by the operator using the adjustment unit 107 based on the waveform displayed on the first display unit 103D, for example, so that the SN ratio is greater than 1. Adjust the electrical impedance. The adjustment unit 107 is a mechanism that can manually change the resistance, capacitance, and inductance of the electrical matching circuit. The adjustment unit 107 may be provided in the electrical matching circuit 104 as long as it can be operated manually.

  The example shown in FIG. 3 is an example in which the operator manually adjusts the electrical impedance of the electrical matching circuit 104, but it may be configured to automatically adjust.

  FIG. 4 is a modification of the example shown in FIG. In the example shown in FIG. 4, a determination unit 102D is provided in the control processing computer 102, and a drive unit 108 that changes the electrical impedance of the electrical matching circuit 104 according to a command from the determination unit 102D is provided.

  Based on the waveform displayed on the first display unit 103D, the determination unit 102D supplies a command signal to the drive unit 108 so that the SN ratio is greater than 1. A method for determining whether the S / N ratio of the waveform displayed on the first display unit 103D is greater than 1 can be arbitrarily set. For example, the signal-to-noise ratio can be calculated by Fourier-transforming the waveform, regarding a frequency component equal to or higher than a certain value as noise N, and considering a frequency component less than a certain value as signal S. Other methods are of course possible.

  As described above, according to the second embodiment of the present invention, the same effect as the first embodiment can be obtained. Furthermore, according to the second embodiment, by adjusting the electric matching circuit 104, the ultrasonic transducer 100A and the plurality of receivers 101B can be electrically matched, the sensitivity is improved, and the ultrasonic inspection with a higher SN ratio is performed. There is an effect that can be.

(Example 3)
Next, an ultrasonic flaw detector according to Embodiment 3 of the present invention will be described. FIG. 5 is a schematic configuration diagram of an ultrasonic flaw detector according to Embodiment 3 of the present invention.

  5, the ultrasonic sensor 100, the control unit 102, and the display unit 103 have the same configuration as that of the first embodiment illustrated in FIG. The difference between the first embodiment and the third embodiment is that an electric matching circuit 104 is provided in the transmission / reception unit 101 of the third embodiment. The electrical matching circuit 104 is composed of electronic components such as general resistors, capacitors, and coils. By using the variable resistors, variable capacitors, and variable coils in combination, the electrical matching circuit 104 is adapted to the frequency band to be matched. Setting is possible. Thereby, electrical matching of the plurality of receivers 101B connected in parallel with the ultrasonic transducer 100A is possible.

  Also in the third embodiment shown in FIG. 5, the adjustment unit 107 shown in FIG. 3 is provided, and the electric matching circuit 104 can be adjusted. In FIG. 5, the illustration of the adjustment unit 107 is omitted from the viewpoint of simplification of illustration.

  The contents of flaw detection using the ultrasonic flaw detector according to the third embodiment can be shown in the flowchart shown in FIG.

  In the third embodiment of the present invention, the same effect as in the second embodiment can be obtained.

  In the third embodiment, similarly to the second embodiment, a determination unit 102D is provided in the control processing computer 102 as shown in FIG. 4, and the electric power of the electric matching circuit 104 is determined by a command from the determination unit 102D. It is possible to provide a driving unit 108 that changes impedance.

Example 4
Next, an ultrasonic flaw detector according to Embodiment 4 of the present invention will be described. FIG. 6 is a schematic configuration diagram of an ultrasonic flaw detector according to Embodiment 4 of the present invention.

  6, the ultrasonic sensor 100, the transmission / reception unit 101, the control unit 102, and the display unit 103 have the same configuration as that of the first embodiment shown in FIG. The difference between the first embodiment and the fourth embodiment is that, in the fourth embodiment, a connector 105 that connects the ultrasonic sensor 100 and the transmission / reception unit 101 is provided between the ultrasonic sensor 100 and the transmission / reception unit 101. is there.

  The connector 105 has a structure that connects the plurality of receivers 101B so as to be parallel to each other, and connects the ultrasonic transducer 100A and the plurality of receivers 101B, and includes an electrical matching circuit 104. The electrical matching circuit 104 includes electronic components such as general resistors, capacitors, and coils, and has the same configuration as that of the second and third embodiments. The electrical matching circuit 104 enables electrical matching between the ultrasonic transducer 100A and a plurality of receivers 101B connected in parallel to each other.

  Note that the adjustment unit 107 shown in FIG. 3 is also provided in the fourth embodiment shown in FIG. 6, and the electrical matching circuit 104 can be adjusted. In FIG. 6, the illustration of the adjustment unit 107 is omitted from the viewpoint of simplification of illustration.

  The contents of flaw detection using the ultrasonic flaw detector according to the fourth embodiment can be shown in the flowchart shown in FIG.

  In the fourth embodiment of the present invention, the same effect as in the second embodiment can be obtained.

  In the fourth embodiment, similarly to the second embodiment, a determination unit 102D is provided in the control processing computer 102 as shown in FIG. 4, and the electric power of the electric matching circuit 104 is determined by a command from the determination unit 102D. It is possible to provide a driving unit 108 that changes impedance.

(Example 5)
Next, an ultrasonic flaw detector according to Embodiment 5 of the present invention will be described. FIG. 7 is a schematic configuration diagram of an ultrasonic flaw detector according to Embodiment 5 of the present invention.

  In FIG. 7, the transmitting / receiving unit 101, the control unit 102, and the display unit 103 have the same configuration as that of the first embodiment shown in FIG. The difference between the first embodiment and the fifth embodiment is that, in the fifth embodiment, the ultrasonic sensor 100 is connected to the ultrasonic transducer 100A, the ultrasonic transducer 100B, the ultrasonic transducer 100A, and the pulser 101A. An electrical matching circuit 100C and an electrical matching circuit 101D connected to the ultrasonic transducer 100B and the plurality of receivers 101B are provided. Furthermore, the fifth embodiment is provided with an adjustment unit 109B for adjusting the electric impedance of the electric matching circuit 100C and an adjustment unit 109A for adjusting the electric impedance of the electric matching circuit 101D. 1 and different.

  The electric matching circuits 100C and 101D are composed of electronic components such as general resistors, capacitors, and coils. By using a variable resistor, a variable capacitor, and a variable coil together, a frequency band to be matched is obtained. The corresponding setting is possible. Thereby, the energy of the ultrasonic wave transmitted from the ultrasonic transducer 100A is increased, and a plurality of receivers 101B connected in parallel with the ultrasonic transducer 100B can be electrically matched with each other, and the SN ratio is improved. Can do.

  Next, the flaw detection operation using the ultrasonic flaw detector according to Embodiment 5 will be described with reference to FIG.

  In step S10 to step S60 in FIG. 10, the same operation as in the first embodiment of the present invention is performed. In step S70, based on the waveform displayed on the first display unit 103D of the output unit 103B, the operator determines whether the sensitivity is sufficient based on the SN ratio, and if sufficient, ends the flaw detection.

  If the operator determines that the sensitivity is not sufficient in step S70, in step S71, the operator uses the adjustment unit 109B to perform the ultrasonic transducer 100A using the electrical matching circuit 100C provided in the ultrasonic sensor 100. It adjusts so that the energy of the ultrasonic wave transmitted from may increase. Further, the operator uses the adjustment unit 109A to match the electric impedances of the plurality of receivers 101B connected in parallel with the ultrasonic transducer 100B by the electric matching circuit 101D. After matching the electrical impedance, the ultrasonic wave transmission in step S20 is performed again, and steps S20 to S70 are repeated.

  In the fifth embodiment of the present invention, the same effect as in the second embodiment can be obtained.

  Furthermore, in the fifth embodiment, when the operator determines that the sensitivity is not sufficient, the electrical matching circuit 101D only needs to match the electrical impedances of the plurality of receivers 101B connected in parallel with the ultrasonic transducer 100B. However, since the configuration is such that the energy of the ultrasonic waves transmitted from the ultrasonic transducer 100A is increased, the SN ratio can be further improved.

  Also in the fifth embodiment, a determination unit 102E is provided in the control processing computer 102 as shown in FIG. 8, and a drive unit 110B that changes the electrical impedance of the electrical matching circuit 100C according to a command from the determination unit 102E. In addition, a driving unit 110A that changes the electrical impedance of the electrical matching circuit 101D can be provided.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

  Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 100 ... Ultrasonic sensor, 100A, 100B ... Ultrasonic transducer, 101 ... Transmission / reception part, 101A ... Pulser, 101B ... Receiver, 102 ... Control part, 102A ... Computer for control / processing, 102B: storage device, 102C: addition circuit, 103: display unit, 103A: input unit, 103B: output unit, 105, 106: connector, 107, 109A, 109B ... adjustment unit, 108, 110A, 110B ... drive unit

Claims (9)

A first step of transmitting an electrical signal to an ultrasonic transducer to generate an ultrasonic wave, and transmitting an ultrasonic wave from the ultrasonic transducer to an object to be inspected;
A second step of receiving the reflected wave from the inspection object by the ultrasonic transducer;
The received reflected wave is converted into an electrical signal by the ultrasonic transducer, the converted electrical signal is transmitted to a plurality of receivers connected in parallel to each other, and the plurality of receivers convert the signals into digital signals. 3 steps,
A fourth step of adding or averaging the digital signals converted by the plurality of receivers;
A fifth step of performing an imaging process to display the signal processed in the fourth step on the display unit;
A sixth step of displaying the signal imaged in the fifth step on the display unit;
An ultrasonic flaw detection method comprising: The ultrasonic flaw detection method according to claim 1,
An ultrasonic flaw detection method comprising a step of setting a number to be used among the plurality of receivers before the first step. The ultrasonic flaw detection method according to claim 1,
An ultrasonic flaw detection method comprising: matching an electrical impedance of an ultrasonic transducer and the plurality of receivers by an electric matching circuit based on the imaging processing signal displayed on the display unit. In order to generate an ultrasonic wave, an electrical signal is transmitted to a first ultrasonic transducer via a first electrical matching circuit, and an ultrasonic wave is transmitted from the first ultrasonic transducer to an object to be inspected. And the steps
A second step of receiving a reflected wave from the object to be inspected by a second ultrasonic transducer;
The received reflected wave is converted into an electrical signal by the second ultrasonic transducer, and the converted electrical signal is transmitted to a plurality of receivers connected in parallel to each other via the second electrical matching circuit. A third step of converting to a digital signal at a plurality of receivers;
A fourth step of adding or averaging the digital signals converted by the plurality of receivers;
A fifth step of performing an imaging process to display the signal processed in the fourth step on the display unit;
A sixth step of displaying the signal imaged in the fifth step on the display unit;
Based on the imaging processing signal displayed on the display unit, the first electrical matching circuit is adjusted to adjust the ultrasonic generation energy of the first ultrasonic transducer, and the second electrical matching circuit A seventh step of matching the electrical impedance of the second ultrasonic transducer and the plurality of receivers by the second electrical matching circuit by:
An ultrasonic flaw detection method comprising: An ultrasonic transducer that transmits ultrasonic waves and receives reflected waves from the object;
A drive signal generator for generating a drive signal for the ultrasonic transducer;
A plurality of receivers that are connected in parallel to each other and that convert reflected waves from the inspected object received by the ultrasonic transducer into digital signals;
An adder that adds or averages digital signals converted by the plurality of receivers;
A control processing unit that performs imaging processing of the digital signal processed by the adder;
A display unit for displaying a signal image-processed by the control processing unit;
An ultrasonic flaw detector characterized by comprising: The ultrasonic flaw detector according to claim 5,
The ultrasonic flaw detection apparatus, wherein the display unit includes an input unit that sets a number to be used among the plurality of receivers. The ultrasonic flaw detector according to claim 5,
An ultrasonic wave connected between the plurality of receivers and the ultrasonic transducer, and comprising an electrical matching circuit for matching an electrical impedance between the ultrasonic transducer and the plurality of receivers. Flaw detection equipment.   The ultrasonic transducer and the plurality of receivers according to claim 4, wherein the plurality of receiver units are connected in parallel to each other and between the ultrasonic transducer and the plurality of receivers. An ultrasonic flaw detector comprising an electrical matching circuit for matching electrical impedance and comprising a connector for connecting the ultrasonic transducer and the plurality of receivers. A first ultrasonic transducer that transmits ultrasonic waves to the object to be inspected and receives reflected waves from the object to be inspected;
A drive signal generator for generating a drive signal for the first ultrasonic transducer;
A first electrical matching circuit that is connected between the drive signal generator and the first ultrasonic transducer and adjusts the ultrasonic generation energy of the first ultrasonic transducer;
A second ultrasonic transducer for receiving a reflected wave from the object to be inspected;
A plurality of receivers that are connected in parallel to each other and that convert the reflected waves from the inspected object received by the second ultrasonic transducer into digital signals;
A second electrical matching circuit that is connected between the second ultrasonic transducer and the plurality of receivers and matches an electrical impedance between the second ultrasonic transducer and the plurality of receivers. When,
An adder that adds or averages digital signals converted by the plurality of receivers;
A control processing unit that performs imaging processing of the digital signal processed by the adder;
A display unit for displaying a signal image-processed by the control processing unit;
An ultrasonic flaw detector characterized by comprising:

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