Ultrasonic shear wave probe axis sound pressure distribution measurement method, device, equipment and medium

Abstract

The present application relates to the technical field of sound pressure measurement, and discloses a kind of ultrasonic transverse wave probe axis sound pressure distribution measurement method, device, equipment and medium, comprising: the incidence distance between the virtual source center corresponding to the real source center in the internal of the ultrasonic transverse wave probe to be measured and incident point is calculated;When the ultrasonic transverse wave probe to be measured is in the preset position of the preset test block incidence surface, then control it to emit ultrasonic transverse wave, obtain the wave height amplitude and propagation sound path of the ultrasonic transverse wave received by ultrasonic receiving probe on the preset test block receiving surface;Judgment wave height maximum value, and the corresponding propagation sound path is regarded as the near-field zone length of the ultrasonic transverse wave probe to be measured, the wave height amplitude of 1-3 times near-field zone is corrected based on the ultrasonic wave height amplitude theoretical formula of far-field zone, and the ultrasonic transverse wave probe axis sound pressure distribution is obtained.The present application can accurately measure the near-field zone length of ultrasonic transverse wave probe radiation sound field in workpiece, and accurately characterize the change rule of ultrasonic transverse wave probe axis direction sound pressure with sound path.

Description

Technical Field

[0001] This invention relates to the field of sound pressure measurement technology, specifically to a method, apparatus, equipment, and medium for measuring the axial sound pressure distribution of an ultrasonic transverse wave probe. Background Technology

[0002] Currently, the near-field length of an ultrasonic shear wave probe in a workpiece is often obtained through theoretical calculations. However, due to factors such as probe crystal size and shape, sound-transmitting wedge material, coupling conditions, workpiece anisotropy, and microstructure inhomogeneity, the calculated near-field length often deviates from the actual near-field length of the probe's radiated sound field. This deviation is particularly pronounced when the ultrasonic beam incident angle is close to the first or second critical angle. Furthermore, the near-field length in classical theory is derived from continuous waves, while industrial applications use pulsed waves, further increasing the calculation error. Additionally, theoretical calculations cannot accurately describe the variation of sound pressure with sound path along the axial direction, especially within the 1-3 times near-field range, thus failing to provide a basis for quantitative analysis of defects within this sound path range during ultrasonic shear wave probe detection.

[0003] In addition, numerical simulation methods can also be used to characterize the near-field length of the ultrasonic transverse wave probe in the workpiece and the variation of the axial sound pressure with the sound path. However, it is also affected by factors such as coupling conditions, workpiece anisotropy and non-uniformity of structure, and deviates from the actual radiated sound field of the probe. Summary of the Invention

[0004] In view of this, the present invention provides a method, apparatus, equipment and medium for measuring the axial sound pressure distribution of an ultrasonic shear wave probe, so as to solve the problem of inaccurate axial sound pressure distribution of an ultrasonic shear wave probe.

[0005] In a first aspect, the present invention provides a method for measuring the axial sound pressure distribution of an ultrasonic shear wave probe, the method comprising:

[0006] Based on the structural parameters of the ultrasonic transverse wave probe under test, the incident distance between the virtual source center corresponding to the real source center and the incident point is calculated.

[0007] The ultrasonic transverse wave probe under test is controlled to move at a preset interval on the incident surface of the preset test block. When the ultrasonic transverse wave probe under test is in the preset position, it is controlled to emit ultrasonic transverse waves. The wave height amplitude of the ultrasonic transverse wave received by the ultrasonic receiving probe on the receiving surface of the preset test block is obtained, and the propagation path of the ultrasonic transverse wave at this time is obtained in combination with the incident distance.

[0008] The maximum wave height of the wave height amplitude is determined by reversing the propagation path, and the corresponding propagation path is used as the near-field length of the ultrasonic shear wave probe to be tested. Based on the theoretical formula of ultrasonic wave height amplitude in the far-field region, the wave height amplitude of the near-field region is corrected by 1-3 times to obtain the axial sound pressure distribution law of the 1-3 times near-field region, and thus the axial sound pressure distribution of the ultrasonic shear wave probe is obtained.

[0009] The ultrasonic shear wave probe axial sound pressure distribution measurement method provided in this invention involves controlling the ultrasonic shear wave probe under test to move on the incident surface of a preset test block. When it reaches a preset position, it is controlled to emit ultrasonic shear waves. The wave height amplitude and propagation path of the ultrasonic shear waves received by the ultrasonic receiving probe on the receiving surface of the preset test block are obtained, thereby determining the near-field length of the ultrasonic shear wave probe under test. Based on the theoretical formula for the ultrasonic wave height amplitude in the far-field region, the wave height amplitude of the near-field region is corrected by 1-3 times to obtain the axial sound pressure distribution of the ultrasonic shear wave probe. This invention, by designing a preset test block for actual ultrasonic measurement of the ultrasonic shear wave probe under test, can accurately measure the near-field length of the ultrasonic shear wave probe's radiated sound field in the workpiece and accurately characterize the variation law of sound pressure along the axial direction of the ultrasonic shear wave probe with the sound path. This provides experimental data reference for the quantitative determination of defects in ultrasonic shear wave probes and improves the quantitative accuracy of defects in ultrasonic shear wave probes.

[0010] In one optional implementation, the structural parameters include: the incident angle and refraction angle of the ultrasonic transverse wave probe under test, and the actual position of the internal probe chip on the wedge, where the actual position is the actual source center; the calculation formula for the incident distance between the virtual source center corresponding to the actual source center and the incident point is as follows:

[0011]

[0012] Where l1 is the distance from the actual source center inside the ultrasonic transverse wave probe to the incident point, α is the incident angle of the ultrasonic transverse wave probe to be tested, and β is the refraction angle of the ultrasonic transverse wave probe to be tested.

[0013] This invention takes into account the refraction effect at the incident point of the ultrasonic shear wave probe, which causes the line connecting the real source and the incident point to be out of line with the outgoing sound beam. Therefore, in actual measurement, a fictitious source is used instead of the real source, and the real source is moved to the same straight line as the outgoing sound beam. This incident distance is taken into account when performing analysis, thereby improving the accuracy of the ultrasonic shear wave probe axis sound pressure measurement.

[0014] In one optional implementation, a preset test block is designed based on the structural parameters of the ultrasonic transverse wave probe to be tested and the properties of the workpiece being tested. The test block includes a right-angled trapezoidal block or a cuboid block of different thicknesses. The different distances between the hypotenuse and the vertical side of the right-angled trapezoidal block or the different thicknesses of the cuboid block are used to set the propagation path of the ultrasonic transverse wave.

[0015] This invention uses a test block to measure the acoustic pressure distribution along the axis of an ultrasonic shear wave probe. This allows for the consideration of various influencing factors during the actual measurement process, thereby presenting the actual radiated sound field of the probe and improving the accuracy of the acoustic pressure measurement along the axis of the ultrasonic shear wave probe.

[0016] In one optional implementation, the preset shape and structural parameters of the test block include: the sum of the angle between the inclined surface and the bottom surface of the right-angled trapezoidal test block and the refraction angle of the ultrasonic transverse wave probe under test is 90°; the length of the bottom surface of the right-angled trapezoidal test block is at least 6 times the near-field length of the ultrasonic transverse wave probe under test; the length of the top surface of the right-angled trapezoidal test block is at least 0.5 times the near-field length of the ultrasonic transverse wave probe under test; and the thickness of the right-angled trapezoidal test block and the cuboid test block is at least greater than the width of the main sound beam at the maximum sound path of the ultrasonic transverse wave probe under test.

[0017] In one optional embodiment, the inclined surface of the right-angled trapezoidal test block is used as the incident surface to fix the ultrasonic transverse wave probe under test, and the vertical surface of the right-angled trapezoidal test block is used as the receiving surface to fix the ultrasonic receiving probe. Both the ultrasonic transverse wave probe under test and the ultrasonic receiving probe are connected to an ultrasonic transmitter and receiver to excite the ultrasonic transverse wave probe under test to emit ultrasonic transverse waves, and to convert the ultrasonic transverse waves received by the ultrasonic receiving probe into ultrasonic wave amplitude.

[0018] This invention, by designing right-angled trapezoidal test blocks or cuboid test blocks of different thicknesses, can simulate different propagation paths of ultrasonic shear waves. Under different propagation paths, ultrasonic shear wave transmission and reception are controlled by an ultrasonic transmitter and receiver, thereby measuring the wave height amplitude under different propagation paths. Based on the principle that the wave height amplitude is proportional to the sound pressure, the sound pressure distribution of the ultrasonic shear wave probe can be further obtained.

[0019] In one optional implementation, the process of obtaining the wave height amplitude of the ultrasonic shear wave received by the ultrasonic receiving probe on the receiving surface of a preset test block, and obtaining the propagation path of the ultrasonic shear wave at this time in combination with the incident distance, includes: coupling the ultrasonic receiving probe to the receiving surface of the right-angled trapezoidal test block at the same preset height as the ultrasonic shear wave probe to be tested; controlling the ultrasonic receiving probe to move up and down at the preset height until the ultrasonic shear wave with the maximum wave height amplitude is received; obtaining the interval distance between the position of the ultrasonic receiving probe and the incident point of the ultrasonic shear wave probe to be tested on the incident surface of the right-angled trapezoidal test block; taking the sum of the interval distance and the incident distance as the propagation path of the ultrasonic shear wave, and taking this maximum wave height amplitude as the wave height amplitude of the ultrasonic shear wave under the propagation path.

[0020] This invention improves the accuracy of ultrasonic shear wave probe axial sound pressure measurement by measuring the wave height amplitude of ultrasonic shear waves under different propagation sound paths, ensuring the acquisition of the maximum wave height amplitude corresponding to the propagation sound path, thereby enabling a more accurate characterization of the variation law of ultrasonic shear wave probe axial sound pressure with sound path.

[0021] In one optional implementation, the process of correcting the wave height amplitude in the near-field region to 1-3 times the amplitude of the ultrasonic wave height in the far-field region, based on the theoretical formula for ultrasonic wave height amplitude in the far-field region, to obtain the axial sound pressure variation law in the near-field region, includes: normalizing the wave height amplitude of the acquired ultrasonic shear wave based on the wave height maximum value; plotting the first wave height amplitude-sound path curve with the logarithm of the normalized ultrasonic shear wave height amplitude as the ordinate and the logarithm of the propagation sound path as the abscissa; and plotting the second wave height amplitude-sound path curve according to the theoretical formula for ultrasonic wave height amplitude in the far-field region. The theoretical formula for ultrasonic wave height amplitude is as follows:

[0022]

[0023] Where H1 is the amplitude of the ultrasonic wave in the far field region, and F s Let λ be the area of ​​the ultrasonic shear wave probe crystal, λ be the shear wave wavelength of the ultrasonic shear wave in the preset test block, and H0 be the initial wave height amplitude at the virtual source center. The second wave height amplitude-sound path curve is extended to intersect with the horizontal line passing through the maximum wave height, and the gain difference between the extended lines of the first and second wave height amplitude-sound path curves after the intersection point is calculated. Based on the gain difference and the theoretical formula for ultrasonic wave height amplitude, the axial sound pressure variation law in the near-field region of 1-3 times is obtained, as shown below:

[0024]

[0025] Where H2 is 1-3 times the amplitude of the ultrasonic wave height in the near field region, ΔdB S This represents the gain difference between the first high-amplitude-sound path curve and the extension of the second high-amplitude-sound path curve.

[0026] This invention corrects the wave height amplitude in the determined 1-3 times near-field region based on the theoretical formula of ultrasonic wave height amplitude in the far-field region. It can accurately describe the variation law of sound pressure with sound path in the 1-3 times near-field region, thereby providing a basis for the quantitative detection of defects by ultrasonic shear wave probes and improving the quantitative accuracy of defects by ultrasonic shear wave probes.

[0027] Secondly, the present invention provides an ultrasonic transverse wave probe axial sound pressure distribution measurement device, comprising:

[0028] The data acquisition module is used to calculate the incident distance between the virtual source center corresponding to the real source center and the incident point based on the structural parameters of the ultrasonic transverse wave probe under test.

[0029] The moving measurement module is used to control the ultrasonic transverse wave probe under test to move at a preset interval on the incident surface of the preset test block. When the ultrasonic transverse wave probe under test is in the preset position, it is controlled to emit ultrasonic transverse waves, obtain the wave height amplitude of the ultrasonic transverse wave received by the ultrasonic receiving probe on the receiving surface of the preset test block, and obtain the propagation path of the ultrasonic transverse wave at this time by combining the incident distance.

[0030] The distribution characterization module is used to perform reverse lookup of the propagation path to determine the maximum wave height of the wave height amplitude, and use the corresponding propagation path as the near-field length of the ultrasonic shear wave probe under test. Based on the theoretical formula of ultrasonic wave height amplitude in the far-field region, the wave height amplitude of 1-3 times the near-field region is corrected to obtain the axial sound pressure distribution law of 1-3 times the near-field region, thus obtaining the axial sound pressure distribution of the ultrasonic shear wave probe.

[0031] The ultrasonic shear wave probe axial sound pressure distribution measuring device provided in this invention controls the movement of the ultrasonic shear wave probe under test on the incident surface of a preset test block. When it is in a preset position, it controls the probe to emit ultrasonic shear waves and acquires the wave height amplitude and propagation path of the ultrasonic shear waves received by the ultrasonic receiving probe on the receiving surface of the preset test block. This allows for the determination of the near-field length of the ultrasonic shear wave probe under test. Based on the theoretical formula for the ultrasonic wave height amplitude in the far-field region, the wave height amplitude of the near-field region is corrected by 1-3 times to obtain the axial sound pressure distribution of the ultrasonic shear wave probe. This invention, by designing a preset test block for actual measurement of the ultrasonic shear wave probe under test, can accurately measure the near-field length of the ultrasonic shear wave probe's radiated sound field in the workpiece and accurately characterize the variation of the sound pressure along the axial direction of the ultrasonic shear wave probe with the sound path. This provides experimental data reference for the quantitative determination of defects in ultrasonic shear wave probes and improves the accuracy of defect quantitative determination.

[0032] Thirdly, the present invention provides a computer device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the ultrasonic transverse wave probe axial sound pressure distribution measurement method described in the first aspect or any corresponding embodiment thereof.

[0033] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to perform the ultrasonic transverse wave probe axial sound pressure distribution measurement method of the first aspect or any corresponding embodiment described above. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic flowchart of the ultrasonic transverse wave probe axial sound pressure distribution measurement method according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the measuring device structure for the ultrasonic transverse wave probe axial sound pressure distribution measurement method according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the wave height amplitude-sound path curve of the ultrasonic transverse wave probe axial sound pressure distribution measurement method according to an embodiment of the present invention;

[0038] Figure 4 This is a structural block diagram of an ultrasonic transverse wave probe axis sound pressure distribution measuring device according to an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] This invention is applicable to scenarios involving the quantitative determination of defects in ultrasonic shear wave probes. This invention provides a method for measuring the axial sound pressure distribution of an ultrasonic shear wave probe, which improves the accuracy of defect quantification by accurately characterizing the variation of axial sound pressure with sound path.

[0042] This invention provides an embodiment of an ultrasonic transverse wave probe axis sound pressure distribution measurement method. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0043] This embodiment provides a method for measuring the axial sound pressure distribution of an ultrasonic shear wave probe, which can be used with the aforementioned computer. Figure 1 This is a flowchart of the ultrasonic transverse wave probe axial sound pressure distribution measurement method according to an embodiment of the present invention, such as... Figure 1 As shown, the process includes the following steps:

[0044] Step S101: Calculate the incident distance between the virtual source center corresponding to the real source center and the incident point based on the structural parameters of the ultrasonic transverse wave probe under test.

[0045] Specifically, in this embodiment of the invention, a pre-designed test block is prepared based on the structural parameters of the ultrasonic shear wave probe under test and the properties of the workpiece being tested. This pre-designed test block is used to replace the workpiece being tested to measure the axial sound pressure distribution of the ultrasonic shear wave probe. The structural parameters of the ultrasonic shear wave probe under test include: the incident angle α, the refraction angle β, and the actual position of the probe chip on the wedge, which is the center of the actual source. Because the refraction at the incident point causes the line connecting the actual source and the incident point to be non-linear with the emitted sound beam, this embodiment of the invention uses a fictitious source corresponding to the actual source for subsequent analysis. The formula for calculating the incident distance from the center of the fictitious source corresponding to the center of the actual source to the incident point is as follows:

[0046]

[0047] Where l1 is the distance from the actual source center inside the ultrasonic transverse wave probe to the incident point, α is the incident angle of the ultrasonic transverse wave probe to be tested, and β is the refraction angle of the ultrasonic transverse wave probe to be tested.

[0048] In one optional implementation, the preset test block designed in this embodiment of the invention includes: a right-angled trapezoidal test block or a cuboid test block of different thicknesses, but is not limited thereto. The different distances between the hypotenuse and vertical side of the right-angled trapezoidal test block or the different thicknesses of the cuboid test block are used to set the propagation path of the ultrasonic transverse wave. The shape and structural parameters of the designed pre-designed test block include: (1) The sum of the angle γ between the hypotenuse and the bottom surface of the right-angled trapezoidal test block and the refraction angle β of the ultrasonic transverse wave probe to be tested is 90°, so that the probe beam can be perpendicularly incident on the left vertical surface of the right-angled trapezoidal test block; (2) The length of the bottom surface of the right-angled trapezoidal test block is at least 6 times the near-field length of the ultrasonic transverse wave probe to be tested, so as to set the maximum value of the propagation path range of the ultrasonic transverse wave measurement; (3) The length of the top surface of the right-angled trapezoidal test block is at least 0.5 times the near-field length of the ultrasonic transverse wave probe to be tested, so as to set the minimum value of the propagation path range of the ultrasonic transverse wave measurement; (4) The thickness of the right-angled trapezoidal test block and the cuboid test block is at least greater than the width of the main beam at the maximum path of the ultrasonic transverse wave probe to be tested, so as to prevent side wall reflection from affecting the sound field measurement results of the ultrasonic probe. The material, acoustic impedance, and grain size of the right-angled trapezoidal and cuboid test blocks are the same as or similar to the properties of the workpiece being tested, and the surface roughness Ra should not be greater than 3.2 μm.

[0049] Step S102: Control the ultrasonic transverse wave probe under test to move at a preset interval on the incident surface of the preset test block. When the ultrasonic transverse wave probe under test is in the preset position, control it to emit ultrasonic transverse waves, obtain the wave height amplitude of the ultrasonic transverse wave received by the ultrasonic receiving probe on the receiving surface of the preset test block, and obtain the propagation path of the ultrasonic transverse wave in combination with the incident distance.

[0050] Specifically, in embodiments of the present invention, such as Figure 2 As shown, taking a right-angled trapezoidal test block as an example, the inclined surface of the right-angled trapezoidal test block is used as the incident surface to fix the ultrasonic transverse wave probe under test. The vertical surface on the left side of the right-angled trapezoidal test block is used as the receiving surface to fix the ultrasonic receiving probe. Both the ultrasonic transverse wave probe under test and the ultrasonic receiving probe are connected to an ultrasonic transmitter-receiver. The ultrasonic transmitter-receiver is used to transmit excitation pulses to excite the ultrasonic transverse wave probe under test to emit ultrasonic transverse waves of a specific frequency and wavelength, and to convert the ultrasonic transverse wave signal received by the ultrasonic receiving probe into a high-amplitude ultrasonic wave. Furthermore, the ultrasonic receiving probe is an electromagnetic ultrasonic probe capable of receiving ultrasonic transverse waves, and the receiving area should not exceed 2 mm². 2 If a rectangular test block is used for measurement, a piezoelectric crystal ultrasonic transverse wave probe should be used as the receiving probe, and the receiving area of ​​the probe should not exceed 7 mm². 2 Glycerin and grease are used as coupling agents to eliminate air between the probe and the cuboid test block, so that the ultrasonic transverse wave can effectively penetrate the cuboid test block to achieve the measurement purpose. This is only an example and is not limited to this.

[0051] In one optional embodiment, the present invention controls the ultrasonic transverse wave probe under test to move along the center line of the incident surface of the right-angled trapezoidal test block from top to bottom at preset intervals. Each time it moves to a preset position, the ultrasonic transverse wave probe under test is excited by the ultrasonic transmitter and receiver to emit ultrasonic transverse waves towards the vertical surface of the right-angled trapezoidal test block. Simultaneously, the ultrasonic receiver probe is coupled to the same preset height on the receiving surface of the right-angled trapezoidal test block as the ultrasonic transverse wave probe under test, and the ultrasonic receiver probe is controlled to move up and down at the preset height until the ultrasonic transverse wave with the maximum wave height amplitude is received. The interval distance 'a' between the position of the ultrasonic receiver probe and the incident point of the ultrasonic transverse wave probe under test on the incident surface of the right-angled trapezoidal test block is obtained. The sum of the interval distance 'a' and the incident distance 'l2' is taken as the propagation path S of the ultrasonic transverse wave (S = a + l2), and this maximum wave height amplitude is taken as the wave height amplitude H of the ultrasonic transverse wave under the propagation path. In this embodiment of the invention, a series of scales are engraved on the inclined surface of a right-angled trapezoidal test block. The scales are spaced at a preset interval to indicate the propagation path of the ultrasonic transverse wave in the workpiece when the ultrasonic transverse wave is incident at the corresponding position on the inclined surface.

[0052] Step S103: Perform reverse lookup on the propagation path to determine the maximum value of the wave height amplitude, and use the corresponding propagation path as the near-field length of the ultrasonic shear wave probe to be tested. Based on the theoretical formula of ultrasonic wave height amplitude in the far-field region, correct the wave height amplitude of 1-3 times the near-field region to obtain the axial sound pressure distribution law of 1-3 times the near-field region, and obtain the axial sound pressure distribution of the ultrasonic shear wave probe.

[0053] Specifically, in this embodiment of the invention, measuring all preset positions on the incident surface of the right-angled trapezoidal test block allows for the sequential acquisition of different propagation sound paths S. i The amplitude H of the ultrasonic transverse wave height i (i = 1, 2, 3…). Find the first maximum height of the ultrasonic transverse wave amplitude by corresponding to the reverse order of propagation path length from largest to smallest, denoted as H. N H at this time N The corresponding propagation path S N This is the near-field length of the ultrasonic shear wave probe under test. The maximum wave height H is used as the metric. N Based on this, the amplitude of the obtained ultrasonic shear wave height is normalized using the following formula:

[0054]

[0055] In one optional embodiment, the present invention plots a first wave height amplitude-sound path curve using the normalized logarithm of the ultrasonic shear wave height amplitude, 20lgNorm(H), as the ordinate and the logarithm of the propagation sound path, 20lgS, as the abscissa. Figure 3As shown by the solid line. Simultaneously, based on the theoretical formula for the amplitude of ultrasonic wave height in the far-field region, a second wave height amplitude-sound path curve (actually a straight line) is plotted, as shown... Figure 3 As shown by the dashed line, the straight segment of the first high-amplitude-sound path curve coincides with the second high-amplitude-sound path curve. The theoretical formula for the high amplitude of ultrasonic waves is characterized using the spherical wave formula (which is only approximately applicable beyond three times the near-field region), as follows:

[0056]

[0057] Where H1 is the amplitude of the ultrasonic wave in the far field region, and F s λ is the area of ​​the ultrasonic transverse wave probe chip, λ is the transverse wave wavelength of the ultrasonic transverse wave in the preset test block, and H0 is the amplitude of the initial wave height at the center of the fictitious source.

[0058] In one optional implementation, the present invention extends the second wave height amplitude-sound path curve to intersect the horizontal line passing through the maximum wave height at point O, and calculates the gain difference between the extended lines of the first wave height amplitude-sound path curve and the second wave height amplitude-sound path curve after the intersection point O; based on the gain difference and the theoretical formula for ultrasonic wave height amplitude, the axial sound pressure variation law of 1-3 times the near-field region is obtained, as shown below:

[0059]

[0060] Where H2 is 1-3 times the amplitude of the ultrasonic wave height in the near field region, ΔdB S This represents the gain difference between the first high-amplitude-sound path curve and the extension of the second high-amplitude-sound path curve.

[0061] In one alternative embodiment, the present invention is based on the principle that the amplitude of wave height is proportional to the sound pressure. By combining the theoretical formulas for the amplitude of ultrasonic wave height in the far field region and the theoretical formulas for the amplitude of ultrasonic wave height in the near field region (1-3 times that of the near field region), it can accurately characterize the sound pressure distribution along the axis of the ultrasonic transverse wave probe under test, that is, the variation law of sound pressure with sound path.

[0062] The ultrasonic shear wave probe axial sound pressure distribution measurement method provided in this invention involves controlling the ultrasonic shear wave probe under test to move on the incident surface of a preset test block. When it reaches a preset position, it is controlled to emit ultrasonic shear waves. The wave height amplitude and propagation path of the ultrasonic shear waves received by the ultrasonic receiving probe on the receiving surface of the preset test block are obtained, thereby determining the near-field length of the ultrasonic shear wave probe under test. Based on the theoretical formula for the ultrasonic wave height amplitude in the far-field region, the wave height amplitude of the near-field region is corrected by 1-3 times to obtain the axial sound pressure distribution of the ultrasonic shear wave probe. This invention, by designing a preset test block for actual measurement of the ultrasonic shear wave probe under test, can accurately measure the near-field length of the ultrasonic shear wave probe's radiated sound field in the workpiece and accurately characterize the variation law of the sound pressure along the axial direction of the ultrasonic shear wave probe with the sound path. This provides experimental data reference for the quantitative determination of defects in ultrasonic shear wave probes and improves the quantitative accuracy of defects in ultrasonic shear wave probes.

[0063] This embodiment provides a device for measuring the axial sound pressure distribution of an ultrasonic shear wave probe, such as... Figure 4 As shown, it includes:

[0064] The data acquisition module 401 is used to calculate the incident distance between the virtual source center corresponding to the real source center and the incident point based on the structural parameters of the ultrasonic transverse wave probe under test.

[0065] The mobile measurement module 402 is used to control the ultrasonic transverse wave probe under test to move at a preset interval on the incident surface of the preset test block. When the ultrasonic transverse wave probe under test is in the preset position, it is controlled to emit ultrasonic transverse waves, obtain the wave height amplitude of the ultrasonic transverse wave received by the ultrasonic receiving probe on the receiving surface of the preset test block, and obtain the propagation path of the ultrasonic transverse wave at this time in combination with the incident distance.

[0066] The distribution characterization module 403 is used to perform reverse lookup of the propagation sound path to determine the maximum value of the wave height amplitude, and use the corresponding propagation sound path as the near-field length of the ultrasonic shear wave probe under test. Based on the theoretical formula of ultrasonic wave height amplitude in the far-field region, the wave height amplitude of 1-3 times the near-field region is corrected to obtain the axial sound pressure distribution law of 1-3 times the near-field region, and thus obtain the axial sound pressure distribution of the ultrasonic shear wave probe.

[0067] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0068] In this embodiment, the ultrasonic transverse wave probe axis sound pressure distribution measurement device is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0069] This invention also provides a computer device having the above-described features. Figure 4 The ultrasonic transverse wave probe axis sound pressure distribution measurement device is shown.

[0070] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of a computer device provided in an optional embodiment of the present invention, such as... Figure 5 As shown, the computer device includes one or more processors 10, memory 20, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions executed within the computer device, including instructions stored in or on memory to display graphical information of a GUI on external input / output devices (such as display devices coupled to the interfaces). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 5 Take a processor 10 as an example.

[0071] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0072] The memory 20 stores instructions executable by at least one processor 10 to cause at least one processor 10 to perform the method shown in the above embodiments.

[0073] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computer device. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0074] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0075] The computer device also includes a communication interface 30 for communicating with other devices or communication networks.

[0076] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0077] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for measuring the acoustic pressure distribution along the axis of an ultrasonic shear wave probe, characterized in that, The method includes: Based on the structural parameters of the ultrasonic transverse wave probe under test, the incident distance between the virtual source center corresponding to the real source center and the incident point is calculated. Based on the structural parameters of the ultrasonic transverse wave probe to be tested and the properties of the workpiece being tested, a preset test block is designed. The test block includes: a right-angled trapezoidal test block or a cuboid test block of different thicknesses. The different distances between the hypotenuse and the vertical side of the right-angled trapezoidal test block or the different thicknesses of the cuboid test block are used to set the propagation path of the ultrasonic transverse wave. The ultrasonic transverse wave probe under test is controlled to move at a preset interval on the incident surface of the preset test block. When the ultrasonic transverse wave probe under test is in a preset position, it is controlled to emit ultrasonic transverse waves. The wave height amplitude of the ultrasonic transverse wave received by the ultrasonic receiving probe on the receiving surface of the preset test block is obtained, and the propagation path of the ultrasonic transverse wave is obtained in combination with the incident distance. The propagation path is reversed to determine the maximum value of the wave height amplitude, and the corresponding propagation path is used as the near-field length of the ultrasonic transverse wave probe to be tested. Based on the theoretical formula of ultrasonic wave height amplitude in the far field, the wave height amplitude of 1-3 times the near field is corrected to obtain the axial sound pressure distribution law of 1-3 times the near field, and thus the axial sound pressure distribution of the ultrasonic transverse wave probe is obtained. The structural parameters include: the incident angle, the refraction angle of the ultrasonic transverse wave probe under test, and the actual position of the internal probe chip on the wedge, wherein the actual position is the actual source center; The formula for calculating the incident distance between the virtual source center corresponding to the real source center and the incident point is as follows: in, The distance is the distance from the actual source center inside the ultrasonic transverse wave probe to the incident point. The incident angle of the ultrasonic shear wave probe under test is denoted as . The refraction angle of the ultrasonic transverse wave probe under test; The process of obtaining the wave height amplitude of the ultrasonic transverse wave received by the ultrasonic receiving probe on the receiving surface of the preset test block, and obtaining the propagation path of the ultrasonic transverse wave in combination with the incident distance, includes: The ultrasonic receiving probe is coupled to the receiving surface of the right-angled trapezoidal test block at the same preset height as the ultrasonic transverse wave probe to be tested; The ultrasonic receiving probe is controlled to move up and down at the preset height until an ultrasonic transverse wave with the maximum wave height amplitude is received. Obtain the distance between the location of the ultrasonic receiving probe and the incident point of the ultrasonic transverse wave probe under test on the incident surface of the right-angled trapezoidal test block; The sum of the interval distance and the incident distance is taken as the propagation path of the ultrasonic transverse wave, and the maximum wave height amplitude is taken as the wave height amplitude of the ultrasonic transverse wave under the propagation path. The process of correcting the wave height amplitude in the 1-3 times near-field region based on the theoretical formula for ultrasonic wave height amplitude in the far-field region to obtain the axial sound pressure variation law in the 1-3 times near-field region includes: Based on the maximum wave height, the wave height amplitude of the acquired ultrasonic shear wave is normalized. Plot the first wave height amplitude-sound path curve with the normalized logarithm of the ultrasonic transverse wave height amplitude as the ordinate and the logarithm of the propagation sound path as the abscissa. The second wave height amplitude-sound path curve was plotted based on the theoretical formula for ultrasonic wave height amplitude in the far-field region. The theoretical formula for ultrasonic wave height amplitude is as follows: in, This refers to the high amplitude of ultrasonic waves in the far-field region. This represents the area of ​​the ultrasonic transverse wave probe chip. To preset the transverse wave wavelength of the ultrasonic transverse wave in the test block, The amplitude of the initial wave at the center of the fictitious source; Extend the second wave height amplitude-sound path curve to intersect it with the horizontal line passing through the maximum wave height, and calculate the gain difference between the extended lines of the first wave height amplitude-sound path curve and the second wave height amplitude-sound path curve after the intersection point; The variation law of axial sound pressure in the near-field region of 1-3 times the gain difference and the theoretical formula of ultrasonic wave height amplitude is obtained as follows: in, It is 1-3 times the amplitude of the ultrasound wave in the near field. The gain difference is the difference between the first wave amplitude-sound path curve and the extension of the second wave amplitude-sound path curve.

2. The method according to claim 1, characterized in that, The shape and structural parameters of the preset test block include: The sum of the angle between the inclined surface and the bottom surface of the right-angled trapezoidal test block and the refraction angle of the ultrasonic transverse wave probe to be tested is 90°. The length of the base of the right-angled trapezoidal test block is at least 6 times the near-field length of the ultrasonic transverse wave probe to be tested; The length of the top surface of the right-angled trapezoidal test block is at least 0.5 times the near-field length of the ultrasonic transverse wave probe to be tested; The thickness of the right-angled trapezoidal test block and the cuboid test block is at least greater than the width of the main sound beam at the maximum sound path of the ultrasonic transverse wave probe to be tested.

3. The method according to claim 2, characterized in that, The inclined surface of the right-angled trapezoidal test block is used as the incident surface to fix the ultrasonic transverse wave probe to be tested, and the vertical surface of the right-angled trapezoidal test block is used as the receiving surface to fix the ultrasonic receiving probe. Both the ultrasonic transverse wave probe under test and the ultrasonic receiving probe are connected to an ultrasonic transmitter and receiver to excite the ultrasonic transverse wave probe under test to emit ultrasonic transverse waves and convert the ultrasonic transverse waves received by the ultrasonic receiving probe into ultrasonic wave high amplitude.

4. A device for measuring the acoustic pressure distribution along the axis of an ultrasonic shear wave probe, characterized in that, The device includes: The data acquisition module is used to calculate the incident distance between the virtual source center corresponding to the real source center and the incident point based on the structural parameters of the ultrasonic transverse wave probe under test; the structural parameters include: the incident angle, the refraction angle of the ultrasonic transverse wave probe under test and the real position of the probe chip inside on the wedge, the real position being the real source center; Based on the structural parameters of the ultrasonic transverse wave probe to be tested and the properties of the workpiece being tested, a preset test block is designed. The test block includes: a right-angled trapezoidal test block or a cuboid test block of different thicknesses. The different distances between the hypotenuse and the vertical side of the right-angled trapezoidal test block or the different thicknesses of the cuboid test block are used to set the propagation path of the ultrasonic transverse wave. The formula for calculating the incident distance between the virtual source center corresponding to the real source center and the incident point is as follows: in, The distance is the distance from the actual source center inside the ultrasonic transverse wave probe to the incident point. The incident angle of the ultrasonic shear wave probe under test is denoted as . The refraction angle of the ultrasonic transverse wave probe under test; A mobile measurement module is used to control the ultrasonic transverse wave probe under test to move at preset intervals on the incident surface of a preset test block. When the ultrasonic transverse wave probe under test is at a preset position, it is controlled to emit ultrasonic transverse waves, and the wave height amplitude of the ultrasonic transverse wave received by the ultrasonic receiving probe on the receiving surface of the preset test block is obtained. The propagation path of the ultrasonic transverse wave at this time is obtained in conjunction with the incident distance. The process of obtaining the wave height amplitude of the ultrasonic transverse wave received by the ultrasonic receiving probe on the receiving surface of the preset test block and obtaining the propagation path of the ultrasonic transverse wave in conjunction with the incident distance includes: The ultrasonic receiving probe is coupled to the receiving surface of the right-angled trapezoidal test block at the same preset height as the ultrasonic transverse wave probe to be tested; The ultrasonic receiving probe is controlled to move up and down at the preset height until an ultrasonic transverse wave with the maximum wave height amplitude is received. Obtain the distance between the location of the ultrasonic receiving probe and the incident point of the ultrasonic transverse wave probe under test on the incident surface of the right-angled trapezoidal test block; The sum of the interval distance and the incident distance is taken as the propagation path of the ultrasonic transverse wave, and the maximum wave height amplitude is taken as the wave height amplitude of the ultrasonic transverse wave under the propagation path. The distribution characterization module is used to perform a reverse lookup of the propagation path to determine the maximum wave height of the wave height amplitude, and uses the corresponding propagation path as the near-field length of the ultrasonic shear wave probe under test. Based on the theoretical formula for ultrasonic wave height amplitude in the far-field region, the wave height amplitude of the near-field region is corrected to obtain the axial sound pressure distribution law of the 1-3 times near-field region, thus obtaining the axial sound pressure distribution of the ultrasonic shear wave probe. The process of correcting the wave height amplitude of the 1-3 times near-field region based on the theoretical formula for ultrasonic wave height amplitude in the far-field region to obtain the axial sound pressure variation law of the 1-3 times near-field region includes: Based on the maximum wave height, the wave height amplitude of the acquired ultrasonic shear wave is normalized. Plot the first wave height amplitude-sound path curve with the normalized logarithm of the ultrasonic transverse wave height amplitude as the ordinate and the logarithm of the propagation sound path as the abscissa. The second wave height amplitude-sound path curve was plotted based on the theoretical formula for ultrasonic wave height amplitude in the far-field region. The theoretical formula for ultrasonic wave height amplitude is as follows: in, This refers to the high amplitude of ultrasonic waves in the far-field region. This represents the area of ​​the ultrasonic transverse wave probe chip. To preset the transverse wave wavelength of the ultrasonic transverse wave in the test block, The amplitude of the initial wave at the center of the fictitious source; Extend the second wave height amplitude-sound path curve to intersect it with the horizontal line passing through the maximum wave height, and calculate the gain difference between the extended lines of the first wave height amplitude-sound path curve and the second wave height amplitude-sound path curve after the intersection point; The variation law of axial sound pressure in the near-field region of 1-3 times the gain difference and the theoretical formula of ultrasonic wave height amplitude is obtained as follows: in, It is 1-3 times the amplitude of the ultrasound wave in the near field. The gain difference is the difference between the first wave amplitude-sound path curve and the extension of the second wave amplitude-sound path curve.

5. A computer device, characterized in that, include: The device includes a memory and a processor, which are interconnected and the memory stores computer instructions. The processor executes the computer instructions to perform the ultrasonic transverse wave probe axial sound pressure distribution measurement method according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the ultrasonic transverse wave probe axial sound pressure distribution measurement method according to any one of claims 1 to 3.

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