A test block, system and method for measuring the sound velocity of surface waves under different curved surfaces

Abstract

The present invention discloses a test block, system and method for measuring the sound velocity of surface waves under different curved surfaces, comprising a test block body, wherein the upper surface of the test block body is provided with a convex arc surface and a concave arc surface, and the convex arc surface is tangent to the concave arc surface, a first line groove is provided at the tangent position of the convex arc surface and the concave arc surface, a second line groove is provided on the side of the concave arc surface, a first calibration line is provided on the side of the test block body, and a second calibration line and a third line groove are provided on the front of the test block body, wherein the first calibration line and the first line groove are respectively located on both sides of the convex arc surface, and the first line groove and the second line groove are respectively located on both sides of the concave arc surface. The system and method can accurately measure the sound velocity of surface waves under different curved surfaces.

Description

Technical Field

[0001] The invention relates to a test block, a system and a method for measuring sound velocity, and in particular to a test block, a system and a method for measuring the sound velocity of surface waves under different curved surfaces. Background Art

[0002] Ultrasonic testing is one of the main methods of conventional nondestructive testing. Due to its advantages of high sensitivity, light equipment, easy operation, and high detection efficiency, it has been widely used in machinery, electricity, petrochemical and other industries. Ultrasonic testing can be divided into transverse waves, longitudinal waves, surface waves, plate waves, etc. according to the different wave types used. The propagation speeds of different wave types in the same medium are also different, and the speed of sound is an important parameter in ultrasonic testing, which has a great influence on the accuracy of defect location. Surface waves are a type of ultrasonic wave propagation in a medium. They propagate along the surface of the medium and are often used to find surface and near-surface defects. In addition to changing with the characteristics of the medium, the temperature of the medium and other factors, their speed of sound also varies greatly when propagating along different curved surfaces. At present, the influence of curved surfaces on the speed of sound of surface waves is mostly based on theoretical analysis, and there are few experimental tests. There are also few detailed introductions in domestic and foreign literature. In view of this, it is necessary to develop a system and method to measure the sound velocity of surface waves under different curved surfaces, in order to find out the changes in the sound velocity of surface waves when they propagate on different curved surfaces at equal propagation distances and the influence of the curved surfaces on their sound velocity, etc., to provide more ideas and references for the research and application of surface wave detection technology. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a test block, system and method for measuring the sound velocity of surface waves under different curved surfaces. The test block, system and method can accurately measure the sound velocity of surface waves under different curved surfaces.

[0004] To achieve the above-mentioned purpose, the test block for measuring the sound velocity of surface waves under different curved surfaces described in the present invention includes a test block body, the upper surface of the test block body is provided with a convex arc surface and a concave arc surface, and the convex arc surface is tangent to the concave arc surface, a first wire groove is opened at the tangent position of the convex arc surface and the concave arc surface, a second wire groove is opened on the side of the concave arc surface, a first calibration line is set on the side of the test block body, and a second calibration line and a third wire groove are set on the front of the test block body, wherein the first calibration line and the first wire groove are respectively located on both sides of the convex arc surface, and the first wire groove and the second wire groove are respectively located on both sides of the concave arc surface.

[0005] The convex arc surface and the concave arc surface have the same radius of curvature and central angle.

[0006] The distance between the axis of the first wire groove and the center of the circle corresponding to the convex arc surface is the same as the distance between the axis of the first wire groove and the center of the circle corresponding to the concave arc surface.

[0007] The distance between the axis of the first wire groove and the center of the circle corresponding to the concave arc surface is equal to the distance between the axis of the second wire groove and the center of the circle corresponding to the concave arc surface.

[0008] The second marking line is arranged in parallel with the third line slot.

[0009] The first wire groove, the second wire groove and the third wire groove are all V-shaped structures, and the first wire groove, the second wire groove and the third wire groove have the same width and the same depth.

[0010] The arc length between the first marking line and the first wire groove is equal to the arc length between the first wire groove and the second wire groove, and the arc length between the first marking line and the first wire groove is equal to the distance between the second marking line and the third wire groove.

[0011] A system for measuring the sound velocity of surface waves under different curved surfaces comprises an ultrasonic transducer, an ultrasonic module, an oscilloscope and a test block for measuring the sound velocity of surface waves under different curved surfaces, wherein the ultrasonic module is connected to the oscilloscope and the ultrasonic transducer, and the ultrasonic transducer is attached to the test block for measuring the sound velocity of surface waves under different curved surfaces.

[0012] A method for measuring the acoustic velocity of a surface wave under different curved surfaces comprises the following steps:

[0013] 1) Place the ultrasonic transducer on the test block body and adjust the ultrasonic transducer so that the incident point of the ultrasonic transducer is located at the first calibration line;

[0014] 2) Using the ultrasonic module to transmit a signal to excite the ultrasonic transducer to generate a surface wave, the surface wave propagates on the convex curved surface and the concave curved surface in turn, and generates a first echo and a second echo through the first line groove and the second line groove respectively, the ultrasonic transducer receives the first echo and the second echo, and then converts the first echo and the second echo into a first echo signal and a second echo signal respectively, and sends them to the ultrasonic module, and the ultrasonic module measures the propagation time t of the first echo through an oscilloscope 凸 and the propagation time of the second echo t 凹 , and then calculate the sound velocity c of the surface wave on the convex curved surface 凸 =nπr / 180°t 凸 and the speed of sound c of the surface wave on the concave curved surface 凹 =nπr / 180°t 凹 -t 凸 , where n is the central angle of the convex arc surface and the concave arc surface, and r is the radius of curvature of the convex arc surface and the concave arc surface.

[0015] A method for measuring the acoustic velocity of a surface wave under different curved surfaces comprises the following steps:

[0016] 1) Place the ultrasonic transducer on the test block body and adjust the ultrasonic transducer so that the incident point of the ultrasonic transducer is located at the second calibration line;

[0017] 2) The ultrasonic module transmits a signal to excite the ultrasonic transducer to generate a surface wave. The surface wave generates an echo through the third slot and returns to the ultrasonic transducer. After the ultrasonic module receives the echo signal, the propagation time t of the echo of the third slot is measured by an oscilloscope. 平 , then calculate the speed of sound of the surface wave in the plane as c 平 =nπr / 180°t 平 .

[0018] The present invention has the following beneficial effects:

[0019] The test block, system and method for measuring the sound velocity of surface waves under different curved surfaces described in the present invention are based on the principle of ultrasonic detection during specific operation. A test block specially designed for measuring the sound velocity of surface waves under different curved surfaces is designed to measure the sound velocity of surface waves under different curved surfaces. Specifically, a convex arc surface and a concave arc surface are provided on the upper surface of the test block body. The convex arc surface is tangent to the concave arc surface, and a first line groove for surface wave reflection is provided at the tangent position. A second line groove for surface wave reflection is provided on the side of the concave arc surface. The front side of the test block body is a flat front side and is provided with a third line groove for surface wave reflection. During measurement, the surface wave is emitted and reflected by the first line groove, the second line groove and the third line groove. The operation is convenient and simple, and the practicability is extremely strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the test block of the present invention;

[0021] Figure 2 Schematic diagram of the system for measuring the sound velocity of surface waves under a curved surface;

[0022] Figure 3 Schematic diagram of the system for measuring the sound velocity of surface waves under a plane.

[0023] Among them, 1 is the test block body, 2 is the convex arc surface, 3 is the concave arc surface, 4 is the first calibration line, 5 is the first line groove, 6 is the second line groove, 7 is the second calibration line, 8 is the third line groove, 9 is the ultrasonic transducer, 10 is the ultrasonic module, and 11 is the oscilloscope. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments, and is not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0025] The accompanying drawings show schematic diagrams of structures according to embodiments disclosed in the present invention. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0026] Embodiment 1

[0027] refer to Figure 1 The test block for measuring the acoustic velocity of surface waves under different curved surfaces described in the present invention comprises a test block body 1, a convex arc surface 2 and a concave arc surface 3 are arranged on the upper surface of the test block body 1, and the convex arc surface 2 is tangent to the concave arc surface 3, a first line groove 5 is provided at the tangent position of the convex arc surface 2 and the concave arc surface 3, a second line groove 6 is provided on the side of the concave arc surface 3, a first calibration line 4 is provided on the side of the test block body 1, and a second calibration line 7 and a third line groove 8 are provided on the front of the test block body 1, wherein the first calibration line 4 and the first line groove 5 are respectively located on both sides of the convex arc surface 2, the first line groove 5 and the second line groove 6 are respectively located on both sides of the concave arc surface 3, and the curvature radius and the central angle of the convex arc surface 2 and the concave arc surface 3 are the same.

[0028] The distance between the axis of the first wire groove 5 and the corresponding center of the convex arc surface 2 and the distance between the axis of the first wire groove 5 and the corresponding center of the concave arc surface 3 are the same; the distance between the axis of the first wire groove 5 and the corresponding center of the concave arc surface 3 is equal to the distance between the axis of the second wire groove 6 and the corresponding center of the concave arc surface 3; the second calibration line 7 is set parallel to the third wire groove 8.

[0029] The first wire groove 5 , the second wire groove 6 and the third wire groove 8 are all V-shaped structures, and the first wire groove 5 , the second wire groove 6 and the third wire groove 8 have the same width and the same depth.

[0030] The arc length between the first marking line 4 and the first wire groove 5 is equal to the arc length between the first wire groove 5 and the second wire groove 6 , and the arc length between the first marking line 4 and the first wire groove 5 is equal to the distance between the second marking line 7 and the third wire groove 8 .

[0031] Embodiment 2

[0032] refer to Figure 2 The system for measuring the sound velocity of surface waves under different curved surfaces described in the present invention includes an ultrasonic transducer 9, an ultrasonic module 10, an oscilloscope 11 and a test block for measuring the sound velocity of surface waves under different curved surfaces, wherein the ultrasonic module 10 is connected to the oscilloscope 11 and the ultrasonic transducer 9, and the ultrasonic transducer 9 is attached to the test block for measuring the sound velocity of surface waves under different curved surfaces.

[0033] Embodiment 3

[0034] refer to Figure 2 The method for measuring the acoustic velocity of surface waves under different curved surfaces of the present invention comprises the following steps:

[0035] 1) placing the ultrasonic transducer 9 on the test block body 1, and adjusting the ultrasonic transducer 9 so that the incident point of the ultrasonic transducer 9 is located at the first calibration line 4;

[0036] 2) Using the ultrasonic module 10 to transmit a signal to excite the ultrasonic transducer 9 to generate a surface wave, the surface wave propagates on the convex curved surface 2 and the concave curved surface 3 in turn, and generates a first echo and a second echo through the first line groove 5 and the second line groove 6 respectively, the ultrasonic transducer 9 receives the first echo and the second echo, and then converts the first echo and the second echo into a first echo signal and a second echo signal respectively, and sends them to the ultrasonic module 10, and the ultrasonic module 10 measures the propagation time t of the first echo through the oscilloscope 11 凸 and the propagation time of the second echo t 凹 , and then calculate the sound velocity c of the surface wave on the convex curved surface 2 凸 =nπr / 180°t 凸 and the speed of sound c of the surface wave on the concave arc surface 3 凹 =nπr / 180°t 凹 -t 凸 , where n is the central angle of the convex arc surface and the concave arc surface 3, and r is the curvature radius 2 of the convex arc surface 2 and the concave arc surface 3.

[0037] Embodiment 4

[0038] refer to Figure 3 The method for measuring the acoustic velocity of surface waves under different curved surfaces of the present invention comprises the following steps:

[0039] 1) placing the ultrasonic transducer 9 on the test block body 1 and adjusting the ultrasonic transducer 9 so that the incident point of the ultrasonic transducer 9 is located at the second calibration line 7;

[0040] 2) The ultrasonic module 10 transmits a signal to excite the ultrasonic transducer 9 to generate a surface wave. The surface wave generates an echo through the third slot 8 and returns to the ultrasonic transducer 9. After the ultrasonic module 10 receives the echo signal, the propagation time t of the echo of the third slot 8 is measured by the oscilloscope 11. 平 , then calculate the speed of sound of the surface wave in the plane as c 平 =nπr / 180°t 平 .

[0041] The present invention can be used to measure the change of the sound velocity of surface waves under different curved surfaces at equal distances, determine the propagation speed of surface waves on convex curved surfaces and concave curved surfaces under a certain curvature, and compare it with the plane propagation speed of surface waves at equal distances, so as to further study the relationship and influence of the curvature of the workpiece and the wavelength, wave type conversion, etc. during the propagation of surface waves; in addition, the present invention can meet the measurement requirements using conventional ultrasonic transducers and ordinary coupling agents, and the measurement results are accurate and highly operational; at present, there is no introduction to this technical method at home and abroad, and this technology has certain research value.

Claims

1. A test block for measuring the acoustic velocity of surface waves under different curved surfaces, characterized in that: The invention comprises a test block body (1), wherein the upper surface of the test block body (1) is provided with a convex arc surface (2) and a concave arc surface (3), and the convex arc surface (2) is tangent to the concave arc surface (3), a first line groove (5) is provided at the tangent position of the convex arc surface (2) and the concave arc surface (3), and a second line groove (6) is provided on the side of the concave arc surface (3), a first marking line (4) is provided on the side of the test block body (1), and a second marking line (7) and a third line groove (8) are provided on the front of the test block body (1), wherein the first marking line (4) and the first line groove (5) are respectively located on both sides of the convex arc surface (2), and the first line groove (5) and the second line groove (6) are respectively located on both sides of the concave arc surface (3).

2. The test block for measuring the acoustic velocity of surface waves under different curved surfaces according to claim 1, characterized in that: The convex arc surface (2) and the concave arc surface (3) have the same curvature radius and central angle.

3. The test block for measuring the acoustic velocity of surface waves under different curved surfaces according to claim 1, characterized in that: The distance between the axis of the first wire groove (5) and the center of the circle corresponding to the convex arc surface (2) and the distance between the axis of the first wire groove (5) and the center of the circle corresponding to the concave arc surface (3) are the same.

4. The test block for measuring the acoustic velocity of surface waves under different curved surfaces according to claim 1, characterized in that: The distance between the axis of the first wire groove (5) and the corresponding center of the concave arc surface (3) is equal to the distance between the axis of the second wire groove (6) and the corresponding center of the concave arc surface (3).

5. The test block for measuring the acoustic velocity of surface waves under different curved surfaces according to claim 1, characterized in that: The second marking line (7) is arranged in parallel with the third line groove (8).

6. The test block for measuring the acoustic velocity of surface waves under different curved surfaces according to claim 1, characterized in that: The first wire groove (5), the second wire groove (6) and the third wire groove (8) are all V-shaped structures, and the first wire groove (5), the second wire groove (6) and the third wire groove (8) have the same width and the first wire groove (5), the second wire groove (6) and the third wire groove (8) have the same depth.

7. The test block for measuring the acoustic velocity of surface waves under different curved surfaces according to claim 1, characterized in that: The arc length between the first marking line (4) and the first line groove (5) is equal to the arc length between the first line groove (5) and the second line groove (6), and the arc length between the first marking line (4) and the first line groove (5) is equal to the distance between the second marking line (7) and the third line groove (8).

8. A system for measuring the acoustic velocity of surface waves under different curved surfaces, characterized in that: The invention comprises an ultrasonic transducer (9), an ultrasonic module (10), an oscilloscope (11), and a test block for measuring the sound velocity of surface waves under different curved surfaces as claimed in claim 1, wherein the ultrasonic module (10) is connected to the oscilloscope (11) and the ultrasonic transducer (9), and the ultrasonic transducer (9) is attached to the test block for measuring the sound velocity of surface waves under different curved surfaces.

9. A method for measuring the acoustic velocity of surface waves under different curved surfaces, characterized in that: The system for measuring the acoustic velocity of surface waves under different curved surfaces according to claim 8 comprises the following steps: 1) placing an ultrasonic transducer (9) on the test block body (1), and adjusting the ultrasonic transducer (9) so that the incident point of the ultrasonic transducer (9) is located at the first calibration line (4); 2) using the ultrasonic module (10) to transmit a signal to excite the ultrasonic transducer (9) to generate a surface wave, the surface wave propagates on the convex curved surface (2) and the concave curved surface (3) in sequence, and respectively generates a first echo and a second echo through the first line slot (5) and the second line slot (6), the ultrasonic transducer (9) receives the first echo and the second echo, and then converts the first echo and the second echo into a first echo signal and a second echo signal, respectively, and sends them to the ultrasonic module (10), and the ultrasonic The acoustic module (10) measures the propagation time tconvex of the first echo and the propagation time tconcave of the second echo through an oscilloscope (11), and then calculates the sound velocity of the surface wave on the convex arc surface (2) cconvex=nπr / (180°tconvex) and the sound velocity of the surface wave on the concave arc surface (3) cconcave=nπr / [180°(tconcave-tconvex)], wherein n is the central angle corresponding to the convex arc surface (2) and the concave arc surface (3), and r is the curvature radius corresponding to the convex arc surface (2) and the concave arc surface (3).

10. A method for measuring the acoustic velocity of surface waves under different curved surfaces, characterized in that: The system for measuring the acoustic velocity of surface waves under different curved surfaces according to claim 8 comprises the following steps: 1) placing an ultrasonic transducer (9) on the test block body (1), and adjusting the ultrasonic transducer (9) so that the incident point of the ultrasonic transducer (9) is located at the second calibration line (7); 2) Using an ultrasonic module (10) to transmit a signal to excite an ultrasonic transducer (9) to generate a surface wave, the surface wave generates an echo through the third slot (8) and returns to the ultrasonic transducer (9), after the ultrasonic module (10) receives the echo signal, it measures the propagation time tping of the echo of the third slot (8) through an oscilloscope (11), and then calculates the sound velocity of the surface wave in the plane as cping=nπr / (180°tping).

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