Device and method for measuring sound field emitted by water immersion ultrasonic line focusing probe

Abstract

The invention discloses a device and a method for measuring a sound field emitted by a water immersion ultrasonic line focusing probe. The device comprises a test block groove, a first reflector, a second reflector, a probe and a three-dimensional motion mechanism, during measurement, the first reflecting body and the second reflecting body are respectively, detachably and alternately fixed on the bottom surface of the test block groove in sequence; the probe is suspended on the reflector in the test block groove through the three-dimensional movement mechanism, and a sound beam emitted by the probe is perpendicular to the bottom surface of the test block groove; the test block groove is filled with water, and the height of the water ensures that the whole probe is submerged by the water during movement; and the three-dimensional movement mechanism drives the probe to move in the water distance direction and the XY plane direction in the test block groove. According to the device and the method for measuring the sound field emitted by the water immersion ultrasonic line focusing probe, the time for determining the focal length of the probe is saved, the distribution of the obtained sound field is more regular and correct, and the characteristic parameters of the sound field are convenient to measure.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to a device and method for measuring the acoustic field emitted by a water-immersed ultrasonic line-focused probe. Background Art

[0002] The energy of the focus position of the water immersion ultrasonic focusing detection technology is concentrated, which can improve the intensity of the echo signal and increase the signal-to-noise ratio. It is widely used in the detection of metal bars. For large-diameter bars, when the ultrasonic wave emitted by the point-focused probe is incident on the surface of the bar, it is similar to plane incidence. However, for bars with a diameter in the range of Ф8mm to Ф58mm, when the point-focused ultrasonic sound beam is incident on the circumferential direction of the bar surface, it will quickly diverge, resulting in poor directivity of the focused sound beam, and the detection sensitivity and signal-to-noise ratio will be greatly reduced. As a special application for the detection of small-diameter bars, the line-focused probe is superior to the point-focused probe in terms of sensitivity and signal-to-noise ratio for the detection of small-diameter bars. Shen Kaifeng studied the ultrasonic detection method for internal defects of small-diameter forged bars. According to the shape of the internal defects of the bars, the detection efficiency of the line-focused probe is higher than that of the point-focused probe. Fan Zhishan et al. used water immersion focusing technology to detect flat-bottomed holes with a depth of 1.5mm and a diameter of 0.8mm in small-diameter bars of TC4 alloy with a diameter of 25mm, and the detection signal had a good signal-to-noise ratio.

[0003] In the field of aviation industry, many components and parts such as blades are often processed and manufactured with small diameter bars. Water immersion line focused ultrasonic testing technology has been widely used for high-precision imaging detection of internal defects of small diameter bars. The performance of water immersion ultrasonic line focused probe and the transmitted sound field directly affect the detection capability and detection efficiency. Therefore, obtaining the characteristic parameters of the sound field and the distribution of the sound field are the key technical issues of water immersion ultrasonic line focused testing technology. The sound field distribution of the cross section at the focus of the line focused probe measured by the traditional ball target method is prone to tilt, which is not conducive to the measurement of the characteristic parameters of the sound field. In addition, the probe takes a lot of time to determine the focal length, and the measurement efficiency is low.

[0004] In the prior art, an invention patent with patent application number CN101539542A discloses a water immersion focusing probe performance test device and method, in which a steel ball set on a reference reflection seat is used as a signal reflector to test the difference in probe performance through the change of the reflected signal, that is, the ball target method is used for detection. Summary of the invention

[0005] The technical problem to be solved by the present invention is to solve the problem that the cross-sectional sound field distribution at the focus of the line focusing probe measured by the traditional ball target method is prone to tilt, which is not conducive to the measurement of sound field characteristic parameters, and the probe takes a lot of time to determine the focal length, resulting in low measurement efficiency.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A water-immersion ultrasonic line-focused probe emission sound field measurement device comprises: a test block slot (100), a first reflector (200), a second reflector (300), a probe (400) and a three-dimensional motion mechanism; during measurement, the first reflector (200) and the second reflector (300) are respectively and sequentially detachably fixed alternately on the bottom surface of the test block slot (100); the probe (400) is suspended on the reflector in the test block slot (100) through the three-dimensional motion mechanism, and the sound beam emitted by the probe (400) is perpendicular to the bottom surface of the test block slot (100); the test block slot (100) is filled with water, and the height of the water ensures that the entire probe (400) is submerged in water during movement; the three-dimensional motion mechanism drives the probe (400) to move in the test block slot (100) in the water distance direction and the XY plane direction.

[0008] Advantages: The present invention uses different reflectors to measure the acoustic field characteristic parameters of the water-immersion ultrasonic line-focused detection probe and images its acoustic field distribution. The measurement results obtained with different reflectors are compared and analyzed. The acoustic field characteristic parameters of the line-focused probe measured with the first reflector are more accurate and easier to operate. The acoustic field distribution of the probe can be obtained by using the second reflector on the basis of the first reflector, which is convenient for controlling the placement of the probe during detection, optimizing the scanning plan, and improving the detection efficiency, sensitivity, and signal-to-noise ratio.

[0009] In one embodiment of the present invention, when the first reflector (200) is placed, it is parallel to the bottom surface of the test block groove (100), the bottom surface of the test block groove (100) is parallel to the XY plane, and the length direction of the first reflector (200) is parallel to the X axis.

[0010] In one embodiment of the present invention, the first reflector (200) is cylindrical.

[0011] In one embodiment of the present invention, the diameter of the first reflector (200) and the second reflector (300) is at least 10 times the wavelength of the speed of sound in water.

[0012] In one embodiment of the present invention, the second reflector (300) is spherical.

[0013] In one embodiment of the present invention, after obtaining a cross-sectional sound pressure distribution diagram of the probe (400) using the first reflector (200), the first reflector (200) is replaced with the second reflector (300) to ensure that the distance from the probe (400) to the first reflector (200) in the water distance direction is equal to the distance from the probe (400) to the second reflector (300) in the water distance direction.

[0014] The present invention also provides a method for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe, using the above-mentioned device for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe, comprising the following steps:

[0015] The first reflector (200) is detachably fixed on the bottom surface of the test block groove (100), the first reflector (200) is parallel to the bottom surface of the test block groove (100); the bottom surface of the test block groove (100) is parallel to the XY plane, and the length direction of the first reflector (200) is parallel to the X axis;

[0016] The probe (400) is adjusted in the water distance direction and the XY plane direction so that the reflected wave of the first reflector (200) is the highest; the probe (400) receives the reflected echo of the first reflector (200) and its position, and obtains an axial sound pressure distribution diagram;

[0017] After obtaining the axial sound pressure distribution diagram of the probe (400) by using the first reflector (200), the first reflector (200) is replaced with a second reflector (300) which is detachably fixed to the bottom surface of the test block groove (100), and the distance from the probe (400) to the first reflector (200) in the water distance direction is ensured to be equal to the distance from the probe (400) to the second reflector (300) in the water distance direction;

[0018] After the replacement is completed, the cross-sectional scanning range is set to obtain a cross-sectional acoustic field distribution diagram of the probe (400).

[0019] In one embodiment of the present invention, according to the distribution characteristics of the axial sound pressure distribution diagram, the distance at the maximum amplitude point is the focal length F of the probe (400), and the distance between the two points where the maximum amplitude position drops by -6 dB and intersects the axial sound pressure distribution curve is the field depth L of the probe (400).

[0020] In one embodiment of the present invention, when the first reflector (200) measures the axial sound pressure distribution, when measuring the size of the short axis of the probe (400), the focal line of the probe (400) is moved in the Y-axis direction parallel to the first reflector (200); when measuring the size of the long axis of the probe (400), the probe (400) is rotated so that the focal line moves in the Y-axis direction perpendicular to the first reflector (200).

[0021] In one embodiment of the present invention, according to the distribution characteristics of the cross-sectional sound field distribution diagram, the distance between the two points where the maximum amplitude position of the sound pressure distribution curve at the center of the cross-sectional sound field drops by -3 dB and intersects with the curve is the size of the long axis of the probe (400); the distance between the two points where the maximum amplitude position of the sound pressure distribution curve at the center of the cross-sectional sound field drops by -3 dB and intersects with the curve is the size of the short axis of the probe.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: the cross-sectional sound field distribution at the focus of the line focusing probe measured by the ball target method is prone to tilt, which is not conducive to the measurement of the characteristic parameters of the sound field, and the probe needs to spend a lot of time to determine the focal length, and the measurement efficiency is low. However, the present invention first uses a steel wire to adjust the direction of the probe emitting the sound field, and then uses the ball target method to measure the sound field distribution, which not only saves the time for determining the focal length of the probe, but also makes the obtained sound field distribution more regular and correct, which is convenient for the measurement of the characteristic parameters of the sound field.

[0023] The steel wire method and the ball target method after steel wire adjustment can obtain more accurate acoustic field characteristic parameters of the line focusing probe, and the probe acoustic field can be visualized. In addition, the probe performance and its acoustic field measurement can be used to evaluate the detection capability of the water-immersed line focusing probe for ultrasonic testing of small-diameter bars, avoid false detection and missed detection of defects caused by probe performance degradation, and purchase suitable probes according to the probe acoustic field distribution, reasonably plan the probe detection path, improve detection efficiency, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a schematic diagram of a device for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe according to an embodiment of the present invention.

[0025] Figure 2 It is a schematic diagram of another device for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe according to an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the axial sound pressure and lateral sound pressure distribution of the probe when measuring the first reflector according to an embodiment of the present invention.

[0027] Figure 4 Schematic diagram of cross-sectional sound field distribution according to an embodiment of the present invention.

[0028] Figure 5 Schematic diagram of measuring axial sound pressure distribution characteristics of an embodiment of the present invention.

[0029] Figure 6 and Figure 7 Schematic diagram of measuring the cross-sectional sound pressure characteristics of a line focusing probe according to an embodiment of the present invention.

[0030] FIG8( a ) and FIG8 ( b ) are cross-sectional acoustic field distribution diagrams at the focal position of the line focusing probe according to an embodiment of the present invention.

[0031] Figure 9(a) to Figure 9(c) The three probes of the embodiment of the present invention are used to measure the axial sound pressure distribution diagram using the steel wire method and the ball target method after the steel wire is adjusted.

[0032] Fig.10 The cross-sectional acoustic field distribution characteristics of an embodiment of the present invention are analyzed.

[0033] Figure 11(a) to Figure 11(c) The cross-sectional sound pressure distribution curves are obtained by measuring the three probes using the steel wire method and the ball target method respectively in the embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described in conjunction with the accompanying drawings of the specification.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0036] See also Figure 1 and Figure 2 As shown, the present invention provides an underwater ultrasonic line focusing probe emission sound field measurement device, comprising a test block slot 100, a first reflector 200, a second reflector 300, a probe 400 and a three-dimensional motion mechanism. During measurement, the first reflector 200 and the second reflector 300 are respectively and alternately fixed on the bottom surface of the test block slot 100 in a detachable manner; the probe 400 is suspended on the reflector in the test block slot 100 through the three-dimensional motion mechanism, and the sound beam emitted by the probe 400 is perpendicular to the bottom surface of the test block slot 100. The test block slot 100 is filled with water, and the height of the water ensures that the entire probe 400 is submerged in water during movement. The three-dimensional motion mechanism drives the probe 400 to move in the water distance direction (Z-axis direction) and the XY plane direction in the test block slot 100. The bottom surface of the test block slot 100 is parallel to the XY plane, that is, the sound beam emitted by the probe 400 is perpendicular to the XY plane, forming an underwater focused sound field perpendicular to the XY plane. The three-dimensional motion mechanism is an existing mechanism, which drives the probe 400 to move in the XYZ axis direction.

[0037] See also Figure 1 and Figure 2 As shown, in one embodiment of the invention, when the first reflector 200 is placed, it is parallel to the bottom surface of the test block groove 100, and the length direction of the first reflector 200 is parallel to the X axis. And the first reflector 200 is cylindrical. In this embodiment, the first reflector 200 is taken as a steel wire.

[0038] See also Figure 1 and Figure 2As shown, in one embodiment of the invention, after the cross-sectional sound pressure distribution diagram of the probe 400 is obtained by using the first reflector 200, the first reflector 200 is replaced with the second reflector 300 to ensure that the distance from the probe 400 to the first reflector 200 in the water distance direction is equal to the distance from the probe 400 to the second reflector 300 in the water distance direction. Specifically, the second reflector 300 is spherical, and in this embodiment, the second reflector 300 is an example of a steel ball.

[0039] In one embodiment of the present invention, according to the requirements of the ASTM standard, when testing the performance of the probe, the diameter of the first reflector 200 and the second reflector 300 is at least 10 times the wavelength of the sound speed in water. Take the nominal parameters of the probe 400 in Table 1 as an example:

[0040] Table 1 Probe nominal parameters

[0041] Probe Model Chip size Center frequency Focus in water Manufacturer Probe No. Remark IX1016M mm 10MHz 60mm TLC S / N G21605

[0042] The wavelength of sound speed in water is obtained by the following formula:

[0043] λ = C*f;

[0044] In the formula, λ represents the wavelength of sound speed in water, C* represents the sound speed in water, and f represents the center frequency of the probe. The sound speed in water is 1490 m / s. In this embodiment, the center frequency of the probe 400 is 10 MHz. In order to measure the loop gain sensitivity, in this embodiment, the diameters of the first reflector 200 and the second reflector 300 are 1.5 mm.

[0045] See also Figures 1 to 7 As shown, the present invention also provides a method for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe, which uses the above-mentioned device for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe. When the probe 400 is perpendicular to the XY plane, the first reflector 200 is used to measure the focal length of the probe 400 and adjust the focal direction of the probe. The diameter of the first reflector 200 is 1.5 mm. The adjustment steps are as follows:

[0046] The first reflector 200 is detachably fixed to the bottom surface of the test block groove 100 , the first reflector 200 is parallel to the bottom surface of the test block groove 100 , the bottom surface of the test block groove 100 is parallel to the XY plane, and the length direction of the first reflector 200 is parallel to the X axis.

[0047] Adjust the water distance direction and XY plane direction of the probe 400 so that the reflected echo of the first reflector 200 is the highest. If the first reflector 200 is moved to measure the acoustic field characteristic parameters of the probe 400, the first reflector 200 may be bent during the movement of the first reflector 200 because the diameter of the first reflector 200 is small, and the length of the first reflector 200 is larger than the diameter of the probe 400, and the movement of the first reflector 200 will affect the static sound pressure in the water in a larger range. Therefore, the first reflector 200 is fixed and the three-dimensional motion mechanism drives the probe 400 to move in the XY plane (sound beam cross section) and XZ (sound beam axial section) planes, and the reflected echo of the first reflector 200 received by the probe 400 and its position are recorded to obtain the focal cross-sectional sound pressure distribution diagram and the axial sound pressure distribution diagram.

[0048] When the first reflector 200 measures the cross-sectional sound pressure distribution, there are two directions. When measuring the short axis size of the probe 400, the focus line of the probe 400 moves parallel to the first reflector 200 in the Y-axis direction. When measuring the long axis size of the probe 400, the probe 400 rotates 90° to make the focus line move perpendicular to the first reflector 200 in the Y-direction. Among them, the theoretical focus area of ​​the line focusing probe is a line, but in practice it is often a focus interval, such as Figure 4 The diagram shows the cross-sectional acoustic field distribution of the line-focused probe. As can be seen from the figure, the cross-sectional acoustic field of the line-focused probe has two widths. The lengths of the cross-sectional acoustic pressure distribution of the line-focused probe in two directions can be obtained based on the imaging of the cross-sectional acoustic pressure distribution. The length along the theoretical focal line of the line-focused probe is defined as the long axis of the probe 400, and the length in the vertical direction is defined as the short axis.

[0049] However, the first reflector 200 obtains the total average sound pressure distribution of the probe 400 over a certain length on the first reflector 200, and cannot obtain the sound pressure at a certain point in the sound field space. To obtain the sound field distribution diagram of the probe 400, the first reflector 200 needs to be replaced with the second reflector 300 for measurement.

[0050] After obtaining the cross-sectional sound pressure distribution diagram and the axial sound pressure distribution diagram of the probe 400 using the first reflector 200, the probe 400 is kept stationary, and the first reflector 200 is replaced with the second reflector 300. By adjusting the position of the probe 400 so that the water distance between the probe 400 and the second reflector 300 is the same as the water distance between the probe 400 and the first reflector 200, when measuring the cross-sectional sound field, the cross-sectional scanning range of the second reflector 300 is 15 mm×5 mm, and the cross-sectional sound field distribution of the probe 400 can be obtained.

[0051] See also Figures 5 to 7As shown, in one embodiment of the present invention, according to the axial sound pressure distribution characteristics, the distance at the maximum amplitude point is the focal length F of the probe 400, and the distance between the two points where the maximum amplitude position drops by -6 dB and intersects the curve is the field depth L of the probe. Figure 5 According to the distribution characteristics of the cross-sectional sound field distribution diagram, the distance between the two points where the maximum amplitude position drops by -3 dB and intersects the curve is the size of the long axis of the probe (400), see Figure 6 The sound pressure distribution curve of the cross-sectional sound field center along the Y-axis direction, the maximum amplitude position drops -3 dB and the distance between the two points where the curve intersects is the short axis size of the probe 400, see Figure 7 shown.

[0052] Example

[0053] Please refer to Figures 8 to 11. In one embodiment of the present invention, the test objects are three water-immersed line-focused ultrasound probes with a nominal frequency of 10 MHz and focal lengths of 25 mm, 38 mm, and 60 mm in water, and one probe with a nominal frequency of 15 MHz and focal length of 20 mm in water. The test results are analyzed as follows using the above-mentioned water-immersed ultrasound line-focused probe emission sound field measurement method:

[0054] Figure 8(a) and 8(b) This is the cross-sectional acoustic field distribution diagram at the focal position of the line focusing probe. The cross-sectional acoustic field distribution diagram is colored according to the color-amplitude scale on the right. The gain is 10 dB, the probe frequency is 15 MHz, and the nominal focal length in water is 20 mm.

[0055] FIG8(a) shows the measurement of the focal length of the probe in water using only a second reflector with a diameter of 3.18 mm, and the measurement of the cross-sectional acoustic field distribution of the focal area of ​​the probe acoustic field using this second reflector at the focal position of the probe.

[0056] FIG8(b) shows the use of a first reflector with a diameter of 1.5 mm to measure the focal length of the probe. After measuring the focal length of the probe and adjusting the focal line of the probe to be parallel to the first reflector, a second reflector with a diameter of 3.18 mm is used to perform imaging detection on the cross-sectional acoustic field of the focal area.

[0057] Figure 8(a) and 8(b)It is shown that the sound field distribution of the probe that only uses the second reflector to determine the focus is tilted, and the color distribution at the edge of the sound field is uneven. Using the first reflector to measure the focal length and adjust the sound field so that the probe focusing line is parallel to the first reflector can obtain a more regular and accurate focal cross-sectional sound field distribution image, and it is more convenient for subsequent measurement of the focal area sound field. Because the cross-sectional sound field distribution at the focus of the line-gathering probe is uneven, when only the second reflector is used to determine the focal length position, it is necessary to move multiple positions to determine the maximum value of the ball target reflection echo. When the first reflector is used, it is only necessary to find the maximum value of the reflection echo of the first reflector to determine the focal length position of the probe. When the second reflector is used to test the probe sound field distribution, it is only necessary to move in the direction of the length of the first reflector to find the maximum value of the reflection echo, and the measurement efficiency is higher.

[0058] Three water-immersed ultrasonic line-focused probes with a nominal frequency of 10 MHz and focal lengths of 60 mm (probe A), 38 mm (probe B), and 25 mm (probe C) in water were selected. The steel wire method and the ball target method adjusted with the steel wire were used to measure the acoustic field characteristics of the probes and compare them to verify the accuracy of the measurement results of this method.

[0059] Table 2 shows the characteristic measurement values ​​of the three probes using the large flat bottom and the first reflector. The difference between the measurement values ​​of the three probes using the large flat bottom and the measurement values ​​using the first reflector is small, but the measurement value using the steel wire method is smaller in duration. In terms of center frequency and peak frequency, the measurement value using the first reflector is larger and closer to the nominal frequency.

[0060] Table 2 Probe nominal values ​​and characteristic measurement values

[0061]

[0062] See also Figure 9(a) to Figure 9(c) As shown in the figure, the axial sound pressure distribution diagrams are obtained by measuring three probes using the steel wire method and the ball target method after the steel wire is adjusted. Among them, the figure on the left is the axial sound pressure distribution diagram of the first reflector, and the figure on the right is the axial sound pressure distribution diagram of the second reflector. Regardless of whether the reflector is a steel wire or a ball target, as the focal length of the probe decreases, the gain required for measurement also decreases. However, when the steel wire is used as a reflector, the required gain is smaller than that of the ball target. In terms of focal length measurement values, the difference between the measurement values ​​of the two reflectors is very small. In terms of field depth measurement values, the measurement value is larger when the steel wire is used as a reflector. The measurement using the ball target is only the axial sound pressure distribution at a certain point in the sound field, while the measurement using the steel wire is the axial sound pressure distribution on the focal line of the probe. The field depth is larger when the steel wire is measured, indicating that when the probe moves axially, the energy decays slowly, and the field depth of the line-focused probe is mainly the field depth of the focal line, so the steel wire is more accurate in the field depth measurement value.

[0063] Fig.10 The cross-sectional acoustic field distribution at the probe focus measured by the ball target method after adjusting with a steel wire, the imaging gains are 14 dB, 8 dB, and -1 dB respectively. As the focal length decreases, the gain required for imaging the acoustic field at the focus decreases, indicating that the energy attenuation of the sound wave decreases during propagation. And as the propagation distance decreases, the acoustic field area at the focus also decreases.

[0064] Figure 11(a) to Figure 11(c) The figure shows the cross-sectional sound pressure distribution curves obtained by measuring the three probes using the steel wire method and the ball target method. The left side is the cross-sectional long axis measurement curve, and the right side is the short axis measurement curve. It can be seen from the figure that in the measurement of the long axis, the measurement result is larger when the steel wire is used, and in the measurement of the short axis, the ball target measurement result is larger. In terms of detection gain, the required gain is smaller when the steel wire is used for measurement, especially when measuring the short axis. In addition, when measuring the short axis, the ball target is only measured at one point, while the steel wire is a line. The size of the short axis is also the width of the focal line. Therefore, the steel wire can be used when measuring the size of the short axis, which is convenient for detection and has high accuracy; but when measuring the size of the long axis, the ball target adjusted by the steel wire can be used, which can not only measure the size of the long axis, but also obtain the cross-sectional sound field distribution of the probe.

[0065] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and therefore it is intended that all changes within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0066] The above-mentioned embodiments only represent the implementation methods of the invention. The protection scope of the present invention is not limited to the above-mentioned embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A water-immersed ultrasonic line-focused probe transmitting sound field measurement device, characterized in that: include: A test block groove (100), a first reflector (200), a second reflector (300), a probe (400) and a three-dimensional motion mechanism; during measurement, the first reflector (200) and the second reflector (300) are respectively and sequentially detachably fixed alternately on the bottom surface of the test block groove (100); the probe (400) is suspended on the reflector in the test block groove (100) through the three-dimensional motion mechanism, and the sound beam emitted by the probe (400) is perpendicular to the bottom surface of the test block groove (100); the test block groove (100) is filled with water, and the height of the water ensures that the entire probe (400) is submerged in water during movement; the three-dimensional motion mechanism drives the probe (400) to move in the test block groove (100) in the water distance direction and the XY plane direction.

2. The device for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe according to claim 1, characterized in that: When the first reflector (200) is placed, it is parallel to the bottom surface of the test block groove (100), the bottom surface of the test block groove (100) is parallel to the XY plane, and the length direction of the first reflector (200) is parallel to the X axis.

3. The device for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe according to claim 1, characterized in that: The first reflector (200) is cylindrical.

4. The device for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe according to claim 1, characterized in that: The diameters of the first reflector (200) and the second reflector (300) are at least 10 times the wavelength of the speed of sound in water.

5. The device for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe according to claim 1, characterized in that: The second reflector (300) is spherical.

6. The device for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe according to claim 1, characterized in that: After the cross-sectional sound pressure distribution diagram of the probe (400) is obtained by using the first reflector (200), the first reflector (200) is replaced with the second reflector (300) to ensure that the distance from the probe (400) to the first reflector (200) in the water distance direction is equal to the distance from the probe (400) to the second reflector (300) in the water distance direction.

7. A method for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe, characterized in that: The device for measuring the acoustic field emitted by the water-immersed ultrasonic line-focused probe according to any one of claims 1 to 6 comprises the following steps: The first reflector (200) is detachably fixed on the bottom surface of the test block groove (100), the first reflector (200) is parallel to the bottom surface of the test block groove (100); the bottom surface of the test block groove (100) is parallel to the XY plane, and the length direction of the first reflector (200) is parallel to the X axis; The probe (400) is adjusted in the water distance direction and the XY plane direction so that the reflected wave of the first reflector (200) is the highest; the probe (400) receives the reflected echo of the first reflector (200) and its position, and obtains an axial sound pressure distribution diagram; After obtaining the axial sound pressure distribution diagram of the probe (400) using the first reflector (200), the first reflector (200) is replaced with a second reflector (300) which is detachably fixed to the bottom surface of the test block groove (100), and the distance from the probe (400) to the first reflector (200) in the water distance direction is ensured to be equal to the distance from the probe (400) to the second reflector (300) in the water distance direction; After the replacement is completed, the cross-sectional scanning range is set to obtain a cross-sectional acoustic field distribution diagram of the probe (400).

8. The method for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe according to claim 7, characterized in that: According to the distribution characteristics of the axial sound pressure distribution diagram, the distance at the maximum amplitude point is the focal length F of the probe (400), and the distance between the two points where the maximum amplitude position drops by -6 dB and intersects the axial sound pressure distribution curve is the field depth L of the probe (400).

9. The method for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe according to claim 7, characterized in that: When the first reflector (200) measures the axial sound pressure distribution, when measuring the size of the short axis of the probe (400), the focal line of the probe (400) is moved in the Y-axis direction parallel to the first reflector (200); when measuring the size of the long axis of the probe (400), the probe (400) is rotated so that the focal line moves in the Y-axis direction perpendicular to the first reflector (200).

10. The method for measuring the acoustic field emitted by an immersion ultrasonic line focusing probe according to claim 7, characterized in that: According to the distribution characteristics of the cross-sectional sound field distribution diagram, the distance between the two points where the maximum amplitude position of the sound pressure distribution curve at the center of the cross-sectional sound field along the X-axis direction and the intersection of the curve is the size of the long axis of the probe (400); and the distance between the two points where the maximum amplitude position of the sound pressure distribution curve at the center of the cross-sectional sound field along the Y-axis direction and the intersection of the curve is the size of the short axis of the probe.

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