Phased array ultrasonic DAC curve normalization test block and correction method

Abstract

The invention belongs to the technical field of ultrasonic detection, and relates to a phased array ultrasonic DAC curve normalization test block and a correction method. A plurality of to-be-detected surfaces are uniformly distributed, standardized performance detection can be conveniently performed on the probe at different angles, the correction efficiency of an array element ultrasonic phased array instrument can be improved, the acoustic characteristics of the detection surfaces are ensured to be consistent through the symmetrical structure, the correction error caused by the shape difference of the test blocks is reduced, and meanwhile, the detection accuracy is improved. The regular prism test block can reduce the influence of temperature and stress deformation on the calibration result. The verification hole serves as a reflector, provides a reflection source with known size and position, and is used for generating a standardized echo signal. By arranging verification holes with different depths, attenuation characteristics under different sound path distances can be simulated, and segmented correction of a DAC curve is assisted. In addition, a plurality of verification holes with different depths are concentrated on the regular prism-shaped test block, so that the volume of the test block is reduced, the test block is convenient to transfer, and materials required for production of the test block are saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of ultrasonic testing, and relates to a phased array ultrasonic DAC curve normalization test block and a calibration method. Background Art

[0002] For special-shaped components such as high-temperature pipeline valves and tees in thermal power plants, due to the special structure, there are blind areas during conventional ultrasonic testing, and the blind area range is relatively large, making it difficult to accurately judge and evaluate defects.

[0003] The phased array ultrasonic testing technology has a focusing function, which makes its sensitivity and resolution higher than those of conventional ultrasonic testing. Phased array testing can simultaneously perform B-scan, D-scan, S-scan, and C-scan. By modeling, a three-dimensional solid graph can be established, making the defect display very intuitive. Compared with the conventional ultrasonic testing technology, the phased array ultrasonic testing technology has higher testing efficiency, sensitivity, and resolution, and also has better imaging ability and adaptability. It is the preferred method for detecting special-shaped components such as high-temperature pipeline valves and tees in thermal power plants.

[0004] However, due to factors such as hardware differences and temperature changes, the amplitude and phase of phased array ultrasonic testing are inconsistent. When detecting the welds of special-shaped components in thermal power plants, large deviations often occur, and when rechecking controversial defects, there are often problems such as poor consistency of test results. Summary of the Invention

[0005] The purpose of the present invention is to provide a phased array ultrasonic DAC curve normalization test block and a calibration method to solve the technical problem of poor consistency of test results in phased array ultrasonic testing. The present invention can realize the calibration of ultrasonic phased array instruments and is beneficial to improving the detection accuracy of ultrasonic phased array instruments.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: The present invention discloses a phased array ultrasonic DAC curve normalization test block. The test block is a regular prism, and the side surface of the test block is the surface to be detected. A calibration hole pointing to the inside of the test block is opened on each surface to be detected, and the depths of the calibration holes on each surface to be detected are different.

[0007] Preferably, the surface roughness of the surface to be detected is less than or equal to 3.2.

[0008] Preferably, the diameter of the calibration hole is 2 mm, the distance between two calibration holes on the same surface to be detected is greater than or equal to 15 mm, and the distance from the orifice of the calibration hole to the edge of the test block is greater than or equal to 15 mm.

[0009] Preferably, the depths of the calibration holes on the test block increase sequentially in the same clockwise direction, and the calibration hole with the maximum depth and the calibration hole with the minimum depth are respectively located on two adjacent surfaces to be detected.

[0010] Preferably, the test block is a regular hexagonal prism, the thickness of the test block is 20 mm, and the side length of the bottom surface of the test block is 45 mm.

[0011] Preferably, the included angle between the calibration hole and the surface to be detected of the test block is 60°.

[0012] Preferably, the depth of the calibration hole with the minimum depth is 2 mm, and the depth of the calibration hole with the maximum depth is 18 mm.

[0013] Preferably, the test block includes six surfaces to be detected, and the six surfaces to be detected include a first surface to be detected, a second surface to be detected, a third surface to be detected, a fourth surface to be detected, a fifth surface to be detected, and a sixth surface to be detected; A calibration hole with a depth of 2 mm and a calibration hole with a depth of 4 mm are provided on the first surface to be detected; A calibration hole with a depth of 6 mm and a calibration hole with a depth of 8 mm are provided on the second surface to be detected; A calibration hole with a depth of 10 mm and a calibration hole with a depth of 12 mm are provided on the third surface to be detected; A calibration hole with a depth of 14 mm is provided on the fourth surface to be detected; A calibration hole with a depth of 16 mm is provided on the fifth surface to be detected; A calibration hole with a depth of 18 mm is provided on the sixth surface to be detected.

[0014] Based on the above structure, the present invention also discloses a phased array ultrasonic DAC curve normalization correction method, which uses a phased array ultrasonic DAC curve normalization test block and includes the following steps: Configure an ultrasonic phased array instrument, select a probe including a preset number of array elements, a sensor frequency range, a wafer pitch, and a height, and set the wedge incident angle; Create an experimental DAC curve corresponding to the wedge incident angle in the array ultrasonic phased array instrument; Apply a coupling agent on the surface to be detected of the test block; Place the probe on the surface to be detected, sequentially activate the array elements, detect all the calibration holes on the test block, and record the echo information and the sound path information of each calibration hole; Calibrate the actual incident angle error according to the echo information and the sound path information, and determine the highest echo corresponding to the created incident angle according to the actual incident angle error; Compare the highest echo corresponding to the created incident angle with the experimental DAC curve, and adjust the gain compensation based on the comparison result to make the echo peaks of each array element match the experimental DAC curve; Measure the output of each calibration hole again to verify the effect of the normalization calibration and ensure that the output amplitudes of all calibration holes are consistent.

[0015] Furthermore, the verification of the actual incident angle error according to the echo information and the sound path information is as follows: Verify the incident angle error by manually inputting the echo information and the sound path information.

[0016] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, multiple surfaces to be detected are evenly distributed, which is convenient for performing standardized performance detection of the probe at different angles, and is beneficial to improving the calibration efficiency of the array element ultrasonic phased array instrument. At the same time, the symmetric structure ensures that the acoustic characteristics of each detection surface are consistent, reducing the calibration error caused by the difference in the shape of the test block. At the same time, the test block in the shape of a regular prism can reduce the influence of temperature and stress deformation on the calibration result. The calibration hole serves as a reflector, providing a reflection source with known size and position for generating a standardized echo signal. By setting calibration holes with different depths, the attenuation characteristics at different sound paths can be simulated to assist in the segmented correction of the DAC curve. In addition, the present invention concentrates multiple calibration holes with different depths on a test block in the shape of a regular prism, which is beneficial to reducing the volume of the test block, facilitating the transportation of the test block, and saving the materials required for the production of the test block.

[0017] The method of the present invention configures an ultrasonic phased array instrument, selects a probe including a preset number of array elements, a sensor frequency range, a wafer pitch, and a height, and sets the wedge incident angle; creates an experimental DAC curve corresponding to the wedge incident angle in the array element ultrasonic phased array instrument to provide a comparison benchmark for subsequent actual detection data and ensure that the echo amplitudes of reflectors at different depths can be quantitatively evaluated. Apply a coupling agent on the surface to be detected of the test block to eliminate the air gap between the probe and the surface of the test block, reduce the loss of acoustic wave energy, avoid abnormal signals of some array elements caused by uneven coupling, and ensure the comparability of multi-array element echo data; place the probe on the surface to be detected, sequentially activate the array elements, detect all calibration holes on the test block, and record the echo information and the sound path information of each calibration hole; verify the actual incident angle error according to the echo information and the sound path information, and determine the highest echo corresponding to the created incident angle according to the actual incident angle error; compare the highest echo corresponding to the created incident angle with the experimental DAC curve, and adjust the gain compensation based on the comparison result to make the echo peaks of each array element match the experimental DAC curve and improve the consistency of the detection result; measure the output of each calibration hole again to verify the effect of the normalization calibration and ensure that the output amplitudes of all calibration holes are consistent. The method of the present invention can realize the calibration of the ultrasonic phased array instrument and is beneficial to improving the detection accuracy of the ultrasonic phased array instrument. Description of the Drawings

[0018] Figure 1Schematic diagram of the test block of the present invention; Figure 2 Flowchart of the method of the present invention.

[0019] Wherein: 1. Test block; 2. Surface to be detected; 3. Calibration hole; 4. First surface to be detected; 5. Second surface to be detected; 6. Third surface to be detected; 7. Fourth surface to be detected; 8. Fifth surface to be detected; 9. Sixth surface to be detected. Specific embodiments

[0020] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] It should be noted that the terms "first", "second", etc. in the description and the above-mentioned drawings of the present invention are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings: See Figure 1, the present invention discloses a phased array ultrasonic DAC curve normalization test block. The test block 1 is a regular prism, and the side surface of the test block 1 is the surface to be detected 2. Multiple surfaces to be detected 2 are evenly distributed, facilitating the standardized performance detection of the probe at different angles, which is beneficial to improving the calibration efficiency of the array element ultrasonic phased array instrument. At the same time, the symmetric structure ensures the same acoustic characteristics of each detection surface, reducing the calibration error caused by the shape difference of the test block. At the same time, the regular prism-shaped test block 1 can reduce the influence of temperature and stress deformation on the calibration result. A calibration hole 3 pointing to the inside of the test block 1 is opened on each surface to be detected 2, and the depths of the calibration holes 3 on each surface to be detected 2 are different. The calibration hole 3 serves as a reflector, providing a reflection source with known size and position for generating a standardized echo signal. By setting calibration holes 3 with different depths, the attenuation characteristics at different sound paths can be simulated to assist in the segmented correction of the DAC curve. In addition, the present invention concentrates multiple calibration holes 3 with different depths on a test block with a regular prism shape, which is beneficial to reducing the volume of the test block, facilitating the transportation of the test block 1, and saving the materials required for the production of the test block 1.

[0023] The test block 1 of the present invention can assist in the calibration of the ultrasonic phased array instrument, which is beneficial to improving the detection accuracy of the ultrasonic phased array instrument.

[0024] Embodiment 1: See Figure 1 , the present invention discloses a phased array ultrasonic DAC curve normalization test block. The test block 1 is a regular prism, and the side surface of the test block 1 is the surface to be detected 2. A calibration hole 3 pointing to the inside of the test block 1 is opened on each surface to be detected 2.

[0025] Preferably, the surface roughness of the surface to be detected 2 is less than or equal to 3.2.

[0026] Preferably, the diameter of the calibration hole 3 is 2 mm, which is convenient for matching the size of the existing probe. The distance between two calibration holes 3 on the same surface to be detected 2 is greater than or equal to 15 mm, and the distance from the orifice of the calibration hole 3 to the edge of the test block 1 is greater than or equal to 15 mm. The orifice of the calibration hole 3 is the opening of the calibration hole 3 on the surface to be detected 2.

[0027] Preferably, the depths of the calibration holes 3 on the test block 1 increase in the same clockwise direction, and the calibration hole 3 with the maximum depth and the calibration hole 3 with the minimum depth are respectively located on two adjacent surfaces to be detected 2. This arrangement can minimize the volume of the test block 1.

[0028] Preferably, the test block 1 is a regular hexagonal prism, the thickness of the test block 1 is 20 mm, and the side length of the bottom surface of the test block 1 is 45 mm.

[0029] Preferably, the included angle between the calibration hole 3 and the surface to be detected 2 of the test block 1 is 60°.

[0030] Preferably, the depth of the calibration hole 3 with the minimum depth is 2 mm, and the depth of the calibration hole 3 with the maximum depth is 18 mm.

[0031] Preferably, the test block 1 includes six surfaces to be detected 2, and the six surfaces to be detected 2 include a first surface to be detected 4, a second surface to be detected 5, a third surface to be detected 6, a fourth surface to be detected 7, a fifth surface to be detected 8, and a sixth surface to be detected 9; A calibration hole 3 with a depth of 2 mm and a calibration hole 3 with a depth of 4 mm are provided on the first surface to be detected 4; A calibration hole 3 with a depth of 6 mm and a calibration hole 3 with a depth of 8 mm are provided on the second surface to be detected 5; A calibration hole 3 with a depth of 10 mm and a calibration hole 3 with a depth of 12 mm are provided on the third surface to be detected 6; A calibration hole 3 with a depth of 14 mm is provided on the fourth surface to be detected 7; A calibration hole 3 with a depth of 16 mm is provided on the fifth surface to be detected 8; A calibration hole 3 with a depth of 18 mm is provided on the sixth surface to be detected 9.

[0032] In the present invention, multiple surfaces to be detected are evenly distributed, which is convenient for performing standardized performance detection on the probe at different angles, and is beneficial to improving the calibration efficiency of the array element ultrasonic phased array instrument. At the same time, the symmetric structure ensures that the acoustic characteristics of each detection surface are consistent, reducing the calibration error caused by the shape difference of the test block. At the same time, the regular prism-shaped test block can reduce the influence of temperature and stress deformation on the calibration result. The calibration hole serves as a reflector, providing a reflection source with known size and position for generating a standardized echo signal. By setting calibration holes with different depths, the attenuation characteristics at different sound paths can be simulated to assist in the segmented correction of the DAC curve. In addition, the present invention concentrates multiple calibration holes with different depths on a test block in the shape of a regular prism, which is beneficial to reducing the volume of the test block, facilitating the transportation of the test block, and saving the materials required for the production of the test block.

[0033] Based on the above structure, the present invention also discloses a method for normalizing and calibrating the phased array ultrasonic DAC curve, which uses a phased array ultrasonic DAC curve normalization test block, see Figure 2 , including the following steps: S1, configure the ultrasonic phased array instrument, select a probe including a preset number of array elements, a sensor frequency range, a wafer pitch, and a height, and set the wedge incident angle; S2, create an experimental DAC curve corresponding to the wedge incident angle in the array element ultrasonic phased array instrument, providing a comparison benchmark for subsequent actual detection data to ensure that the echo amplitudes of reflectors at different depths can be quantitatively evaluated.

[0034] S3. Apply a coupling agent on the surface 2 to be detected of the test block 1 to eliminate the air gap between the probe and the surface of the test block, reduce the loss of acoustic wave energy, avoid abnormal signals of some array elements caused by uneven coupling, and ensure the comparability of the echo data of multiple array elements. S4. Place the probe on the surface 2 to be detected, sequentially activate the array elements, detect all calibration holes 3 on the test block 1, and record the echo information and acoustic path information of each calibration hole 3. S5. Calibrate the actual incident angle error according to the echo information and acoustic path information, and determine the highest echo corresponding to the created incident angle according to the actual incident angle error. Preferably, the calibration of the actual incident angle error according to the echo information and acoustic path information is specifically as follows: Calibrate the incident angle error by manually inputting the echo information and acoustic path information. S6. Compare the highest echo corresponding to the created incident angle with the experimental DAC curve, and adjust the gain compensation based on the comparison result to make the echo peaks of each array element match the experimental DAC curve, improving the consistency of the detection results. S7. Measure the output of each calibration hole 3 again to verify the effect of the normalization calibration and ensure that the output amplitudes of all calibration holes 3 are consistent.

[0035] The method of the present invention can realize the calibration of the ultrasonic phased array instrument, which is beneficial to improving the detection accuracy of the ultrasonic phased array instrument.

[0036] Embodiment 2: See Figure 1 , this embodiment discloses a phased array ultrasonic DAC curve normalization test block, including a test block 1 and several calibration holes 3 on the test block 1.

[0037] Preferably, the material of the test block body is the same as that of the workpiece to be detected or the sound velocity is the same in the test block body and the workpiece to be detected, and it is made by forging process.

[0038] Preferably, the test block 1 is a columnar structure with a regular hexagon bottom surface, the side length of the regular hexagon is 45 mm, the thickness of the test block 1 is 20 mm, and the surface roughness is less than or equal to 3.2.

[0039] Preferably, several calibration holes 3 are provided on the test block, specifically consisting of 9 calibration holes 3 with a diameter of φ2×20 mm.

[0040] Preferably, several calibration holes 3 on the test block are arranged in 6 regions of the hexagonal test block.

[0041] Preferably, 2 calibration holes 3 are arranged in the first surface to be detected 4. The perpendicular distance from the center of the first calibration hole 3 to the edge of the test block is 2 mm, that is, the hole depth is 2 mm, and the distance from the hole opening to the edge is 15 mm. The perpendicular distance from the center of the second calibration hole 3 to the edge of the test block is 4 mm, that is, the hole depth is 4 mm, and the distance between the hole openings of the second hole and the second hole is 15 mm. The first calibration hole 3 and the second calibration hole 3 are arranged in parallel.

[0042] Preferably, 2 calibration holes 3 are arranged in the second surface to be detected 5. The perpendicular distance from the center of the first calibration hole 3 to the edge of the test block is 6 mm, that is, the hole depth is 6 mm, and the distance from the hole opening to the edge is 15 mm. The perpendicular distance from the center of the second hole to the edge of the test block is 8 mm, and the distance between the perpendicular projection points of the second hole on the side length and the perpendicular projection points of the first hole on the side length is 15 mm.

[0043] Preferably, 2 calibration holes 3 are arranged in the third surface to be detected 6. The perpendicular distance from the center of the first calibration hole 3 to the edge of the test block is 10 mm, that is, the hole depth is 10 mm, and the distance from the hole opening to the edge is 15 mm. The perpendicular distance from the center of the second calibration hole 3 to the edge of the test block is 12 mm, that is, the hole depth is 12 mm, and the distance between the perpendicular projection points of the second calibration hole on the side length and the perpendicular projection points of the first hole on the side length is 15 mm.

[0044] The distance between the two holes is set to 15 mm to prevent interference when the ultrasonic phased array instrument detects the two holes, and to avoid the influence of the other hole on the detection process when detecting one of the holes.

[0045] Preferably, 1 calibration hole 3 is arranged in the fourth surface to be detected 7. The perpendicular distance from the center of the hole to the edge of the test block is 14 mm, that is, the hole depth is 14 mm, and the distance from the hole opening to the edge is 20 mm.

[0046] Preferably, 1 calibration hole 3 is arranged in the fifth surface to be detected 8. The perpendicular distance from the center of the hole to the edge of the test block is 16 mm, that is, the hole depth is 16 mm, and the distance from the hole opening to the edge is 20 mm.

[0047] Preferably, 1 calibration hole 3 is arranged in the sixth surface to be detected 9. The perpendicular distance from the center of the hole to the edge of the test block is 18 mm, that is, the hole depth is 18 mm, and the distance from the hole opening to the edge is 20 mm.

[0048] In the present invention, multiple surfaces to be detected are evenly distributed, which is convenient for performing standardized performance detection on the probe at different angles and is beneficial to improving the calibration efficiency of the array ultrasonic phased array instrument. The calibration hole, as a reflector, provides a reflection source with known size and position for generating a standardized echo signal. By setting calibration holes with different depths, the attenuation characteristics at different sound paths can be simulated to assist in the segmented correction of the DAC curve.

[0049] The present invention concentrates calibration holes of multiple different depths on a test block in the shape of a regular prism, which is beneficial to reducing the volume of the test block, facilitating the transportation of the test block, and saving the materials required for the production of the test block.

[0050] The present invention also discloses a method for using a phased array ultrasonic DAC curve normalization test block, see Figure 2 , including the following steps: Step 1: Select a phased array ultrasonic instrument with 16:32 array elements, the sensor frequency range is 5 MHz to 10 MHz, the sensor wafer spacing is 0.5 mm, the wafer height is 10 mm, and the wedge angle is 60°.

[0051] Step 2: Create an experimental DAC curve with a 60° incident angle in the phased array instrument to provide a comparison benchmark for subsequent actual detection data and ensure that the echo amplitudes of reflectors at different depths can be quantitatively evaluated.

[0052] Step 3: In the normalization correction of the ultrasonic DAC curve of the phased array ultrasonic instrument, coupling agents are applied to the six surfaces 2 to be detected of the test block 1 to eliminate the air gap between the probe and the surface of the test block, reduce the loss of acoustic wave energy, avoid abnormal signals of some array elements caused by uneven coupling, and ensure the comparability of multi-array element echo data.

[0053] Step 4: Place the probe on the surface 2 to be detected, sequentially activate 16 array elements, starting from the first surface 4 to be detected to the sixth surface 9 to be detected. By detecting all the calibration holes 3 on the test block 1, record the echo information and acoustic path information of 9 calibration holes 3 with a diameter of φ2×20 mm in sequence.

[0054] Step 5: Calibrate the incident angle error by manually inputting in the phased array ultrasonic instrument to find the highest wave for the newly created incident angle.

[0055] Step 6: Maximize the wave amplitude of the calibration hole 3 and the corresponding echo height, and compare and verify with the experimental DAC curve to obtain a comparison result.

[0056] Step 7: According to the comparison result, make the incident angle echo peak of each array element match the corresponding experimental DAC curve by increasing or decreasing appropriate gain compensation; Step 8: Measure the output of each channel again to verify the effect of the normalization calibration and ensure that the output amplitudes of all channels are consistent.

[0057] The method of the present invention can realize the calibration of the ultrasonic phased array instrument, which is beneficial to improving the detection accuracy of the ultrasonic phased array instrument.

[0058] Compared with the prior art, the present invention has the following technical effects: The test block design makes full use of the feature that each interior angle of a regular hexagon is 120°. When the probe is placed on the surface to be detected 2 for detection, the incident angle of the probe wedge is 60°. The perpendicular distance from the center of the calibration hole 3 of the test block to the edge of the test block is designed to be 2 mm to 18 mm, which can easily distinguish the near field and the far field regions. At the same time, the calibration method provided by the present invention can maintain the high performance and reliability of the phased array ultrasonic testing system, which is crucial for accurately judging the test results.

[0059] The above content is only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the present invention.

Claims

1. A phased array ultrasonic DAC curve normalization test block, characterized in that, The test block (1) is a regular prism. The side surface of the test block (1) is the surface to be detected (2). A calibration hole (3) pointing to the inside of the test block (1) is provided on each surface to be detected (2), and the depths of the calibration holes (3) on each surface to be detected (2) are different.

2. The phased array ultrasonic DAC curve normalization test block according to claim 1, wherein The surface roughness of the surface to be detected (2) is less than or equal to 3.

2.

3. A phased array ultrasonic DAC curve normalization test block according to claim 1, characterized in that, The diameter of the calibration hole (3) is 2 mm. The distance between two calibration holes (3) on the same surface to be detected (2) is greater than or equal to 15 mm. The distance from the orifice of the calibration hole (3) to the edge of the test block (1) is greater than or equal to 15 mm.

4. A phased array ultrasonic DAC curve normalization test block according to claim 1, characterized in that, The depths of the calibration holes (3) on the test block (1) increase sequentially in the same clockwise direction. The calibration hole (3) with the maximum depth and the calibration hole (3) with the minimum depth are respectively located on two adjacent surfaces to be detected (2).

5. A phased array ultrasonic DAC curve normalization test block according to claim 1, characterized in that, The test block (1) is a regular hexagonal prism. The thickness of the test block (1) is 20 mm, and the side length of the bottom surface of the test block (1) is 45 mm.

6. The phased array ultrasonic DAC curve normalization test block according to claim 5, characterized in that, The included angle between the calibration hole (3) and the surface to be detected (2) of the test block (1) is 60°.

7. A phased array ultrasonic DAC curve normalization test block according to claim 5, characterized in that, The depth of the calibration hole (3) with the minimum depth is 2 mm, and the depth of the calibration hole (3) with the maximum depth is 18 mm.

8. A phased array ultrasonic DAC curve normalization test block according to claim 5, characterized in that, The test block (1) includes six surfaces to be detected (2), and the six surfaces to be detected (2) include a first surface to be detected (4), a second surface to be detected (5), a third surface to be detected (6), a fourth surface to be detected (7), a fifth surface to be detected (8), and a sixth surface to be detected (9); A calibration hole (3) with a depth of 2 mm and a calibration hole (3) with a depth of 4 mm are provided on the first surface to be detected (4); A calibration hole (3) with a depth of 6 mm and a calibration hole (3) with a depth of 8 mm are provided on the second surface to be detected (5); A calibration hole (3) with a depth of 10 mm and a calibration hole (3) with a depth of 12 mm are provided on the third surface to be detected (6); A calibration hole (3) with a depth of 14 mm is provided on the fourth surface to be detected (7); A calibration hole (3) with a depth of 16 mm is provided on the fifth surface to be detected (8); A calibration hole (3) with a depth of 18 mm is provided on the sixth surface to be detected (9).

9. A phased array ultrasonic DAC curve normalization and calibration method, characterized in that, Using a phased array ultrasonic DAC curve normalization test block according to any one of claims 1 to 8, includes the following steps: Configure an ultrasonic phased array instrument, select a probe including a preset number of array elements, a sensor frequency range, a wafer pitch, and a height, and set the wedge incident angle; Create an experimental DAC curve corresponding to the wedge incident angle in the array ultrasonic phased array instrument; Apply a coupling agent on the surface to be detected (2) of the test block (1); Place the probe on the surface to be detected (2), sequentially activate the array elements, detect all the calibration holes (3) on the test block (1), and record the echo information and the sound path information of each calibration hole (3); Calibrate the actual incident angle error according to the echo information and the sound path information, and determine the highest echo corresponding to the created incident angle according to the actual incident angle error; Compare the highest echo corresponding to the created incident angle with the experimental DAC curve, and adjust the gain compensation based on the comparison result to make the echo peaks of each array element match the experimental DAC curve; Measure the output of each calibration hole (3) again to verify the effect of the normalization calibration and ensure that the output amplitudes of all calibration holes (3) are consistent.

10. A phased array ultrasonic DAC curve normalization and correction method according to claim 9, characterized in that, The actual incident angle error is calibrated according to the echo information and the sound path information as follows: The incident angle error is calibrated by manually inputting the echo information and the sound path information.

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