阅读说明：本技术 可优化固有波的延时块及超声探头 (Delay block capable of optimizing natural wave and ultrasonic probe ) 是由 蔡庆生 邓宇 骆琦 刘怀远 赖品文 尹璐 吴佐端 于 2021-08-11 设计创作，主要内容包括：本发明公开了一种可优化固有波的延时块,包括透声块,所述透声块包括顶面、底面和位于所述顶面与底面之间的侧壁,且所述透声块上位于声波扩散方向的侧壁上设有声波导流块。本发明还公开了一种超声探头。本发明可优化固有波的延时块,可利用声波导流块吸收扩散至其所在侧壁区域的超声反射信号,从而可以降低固有波对缺陷检测结果的影响,并能够提升超声成像质量。另外,由于声波导流块可吸收大部分扩散的超声反射信号,降低了固有波对检测结果的影响,从而可以将透声块及整个延时块的尺寸设置得更小,能够有效降低透声块及整个延时块的材料用量,并能够降低检测对象尺寸的要求,扩大了尺寸限制工件的可检测区域,相应地也减小了检测盲区。(The invention discloses a delay block capable of optimizing inherent waves, which comprises a sound transmission block, wherein the sound transmission block comprises a top surface, a bottom surface and a side wall positioned between the top surface and the bottom surface, and a sound wave guide block is arranged on the side wall positioned in the sound wave diffusion direction on the sound transmission block. The invention also discloses an ultrasonic probe. The invention can optimize the time delay block of the inherent wave, and can utilize the acoustic wave guide flow block to absorb the ultrasonic reflection signal diffused to the side wall area where the acoustic wave guide flow block is positioned, thereby reducing the influence of the inherent wave on the defect detection result and improving the ultrasonic imaging quality. In addition, the acoustic wave flow guide block can absorb most of diffused ultrasonic reflection signals, so that the influence of inherent waves on a detection result is reduced, the sizes of the sound transmission block and the whole delay block can be set to be smaller, the material consumption of the sound transmission block and the whole delay block can be effectively reduced, the requirement on the size of a detection object can be reduced, the detectable area of a size-limited workpiece is enlarged, and the detection blind area is correspondingly reduced.)

1. A delay block for optimizing natural waves, comprising an acoustically transparent block (1), characterized in that: the sound transmission block (1) comprises a top surface, a bottom surface and a side wall located between the top surface and the bottom surface, a sound wave guide block (2) is arranged on the side wall on the sound transmission block (1), and the sound wave guide block (2) is used for absorbing and diffusing ultrasonic reflection signals in the side wall area where the sound wave guide block is located.

2. The delay block for optimizing a natural wave according to claim 1, wherein: the top surface and the bottom surface are parallel, the geometric dimension of the top surface is smaller than or equal to that of the bottom surface, and in the view direction perpendicular to the top surface, the outer contour line of the top surface does not exceed the range of a sealing area defined by the outer contour line of the bottom surface.

3. The delay block for optimizing a natural wave according to claim 1, wherein: the two sides of the sound transmission block (1) are respectively provided with parallel plane side walls parallel to the sound wave diffusion direction, and the other side walls between the two parallel plane side walls are provided with the sound wave diversion blocks (2).

4. The delay block for optimizing a natural wave according to claim 1, wherein: all the side walls of the sound transmission block (1) are provided with the sound wave guide blocks (2).

5. The delay block for optimizing a natural wave according to any one of claims 1 to 4, wherein: and a saw-tooth structure meshed with each other is arranged between the sound wave guide block (2) and the sound transmission block (1).

6. The delay block for optimizing a natural wave according to claim 5, wherein: the sound wave guide block (2) is arranged on the side wall of the sound transmission block (1) in a bonding or pouring mode.

7. The delay block for optimizing a natural wave according to claim 6, wherein: the acoustic wave diversion block (2) is formed by solidifying a mixture of low-density epoxy resin and metal oxide, and the acoustic wave diversion block (2) is arranged on the side wall of the acoustic transmission block (1) in a pouring mode.

8. The delay block for optimizing a natural wave according to claim 7, wherein: the ratio of the absolute value of the difference between the acoustic impedance of the sound wave guide block (2) and the acoustic impedance of the sound transmission block (1) to the acoustic impedance of the sound transmission block (1) is less than or equal to 10 percent; the attenuation coefficient of the sound wave guide block (2) to the sound wave is larger than that of the sound transmission block (1) to the sound wave.

9. The delay block for optimizing a natural wave according to any one of claims 1 to 4, wherein: the sound-transmitting block (1) is made of polystyrene, organic glass or polyimide.

10. An ultrasound probe characterized by: comprising an ultrasound transducer having a delay block for optimizing natural waves as claimed in any one of claims 1 to 9 attached thereto.

Technical Field

The invention belongs to the technical field of ultrasonic nondestructive testing, and particularly relates to a delay block capable of optimizing inherent waves and an ultrasonic probe.

Background

In the existing ultrasonic array line scanning or 0-degree sector scanning detection process, a delay block with a certain thickness is usually adopted as an acoustic transmission medium between a probe and a workpiece, and because the delay block belongs to an acoustic transmission medium, in the detection process, ultrasonic waves generate acoustic reflection signals at boundary positions such as the side wall and end angles of the delay block, and finally the defect judgment is interfered in an ultrasonic imaging area, wherein the acoustic reflection signals are natural waves. In order to reduce the influence of the natural wave on the detection result, the size of the delay block is generally designed to be large, which not only results in more raw materials for the delay block, but also even if the size of the delay block is increased, due to the sound transmission characteristic of the material, when the detected signal-to-noise ratio is low, there is still inevitably a risk that the natural wave is equivalent to the amplitude of the defect wave signal or the position of the defect wave signal is overlapped, which results in misjudgment.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a delay block and an ultrasonic probe capable of optimizing an eigen wave, which can reduce the influence of the eigen wave on a defect detection result.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention firstly provides a delay block capable of optimizing inherent waves, which comprises a sound transmission block, wherein the sound transmission block comprises a top surface, a bottom surface and a side wall positioned between the top surface and the bottom surface, and a sound wave guide block is arranged on the side wall positioned in the sound wave diffusion direction on the sound transmission block.

Further, the geometric dimension of the top surface is smaller than or equal to that of the bottom surface, and in the view direction perpendicular to the top surface, the outer contour line of the top surface does not exceed the range of the sealing area surrounded by the outer contour line of the bottom surface.

Furthermore, the two sides of the sound transmission block are respectively provided with parallel plane side walls parallel to the sound wave diffusion direction, and the other side walls between the parallel plane side walls are provided with the sound wave guide blocks.

Furthermore, all the side walls of the sound transmission block are provided with the sound wave guide blocks.

Furthermore, a saw tooth structure which is meshed with each other is arranged between the sound wave guide block and the sound transmission block.

Furthermore, the sound wave guide block is attached to the side wall of the sound transmission block in a bonding or pouring mode.

Furthermore, the acoustic wave guide flow block is formed by solidifying a mixture of low-density epoxy resin and metal oxide, and is arranged on the side wall of the acoustic transmission block in a pouring mode.

Further, the ratio of the absolute value of the difference between the acoustic impedance of the acoustic wave flow guide block and the acoustic impedance of the acoustic transmission block to the acoustic impedance of the acoustic transmission block is less than or equal to 10%; the attenuation coefficient of the sound wave guide block to the sound wave is larger than that of the sound transmission block to the sound wave.

Furthermore, the sound-transmitting block is made of polystyrene, organic glass or polyimide.

The invention also provides an ultrasonic probe which comprises the ultrasonic transducer, wherein the ultrasonic transducer is pasted with the delay block capable of optimizing the inherent wave.

The invention has the beneficial effects that:

the delay block of the inherent wave can be optimized, the sound wave guide flow block is arranged on the side wall of the sound transmission block in the diffusion direction of sound wave emission, and the ultrasonic reflection signal diffused to the side wall area of the sound transmission block can be absorbed by the sound wave guide flow block, so that the influence of the inherent wave on the defect detection result can be reduced, and the ultrasonic imaging quality can be improved.

In addition, after the sound transmission block is provided with the sound wave diversion block, the sound wave diversion block can absorb most of diffused ultrasonic reflection signals, and the influence of inherent waves on a detection result is reduced, so that the sizes of the sound transmission block and the whole delay block can be set to be smaller, the material consumption of the sound transmission block and the whole delay block can be effectively reduced, meanwhile, the delay block with the smaller size is more convenient to be used for detection operation in a narrow space, the requirement on the size of a detection object can be reduced, the detectable area of a size-limited workpiece is enlarged, and the detection blind area is correspondingly reduced.

Drawings

In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:

FIG. 1 is a schematic structural diagram of an embodiment of a delay block for optimizing natural waves according to the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a diagram showing a real comparison between a conventional delay block and a delay block capable of optimizing the natural wave according to the present invention;

FIG. 4 is a diagram of an ultrasound imaging system using a conventional delay block;

FIG. 5 is an ultrasound image of a delay block for which the method can be used to optimize the natural wave.

Description of reference numerals:

1-an acoustically transparent block; 1 a-a top surface; 1 b-bottom surface; 1 c-parallel planar sidewalls; 1 d-other sidewalls; 2-acoustic wave diversion blocks.

Detailed Description

The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.

Fig. 1 is a schematic structural diagram of an embodiment of the delay block capable of optimizing the natural wave according to the present invention. The delay block capable of optimizing the natural wave in the embodiment includes a sound transmission block 1, where the sound transmission block 1 includes a top surface 1a, a bottom surface 1b, and a side wall located between the top surface and the bottom surface, and a sound wave guide block 2 is disposed on the side wall located in the sound wave diffusion direction on the sound transmission block 1.

Furthermore, the geometric dimension of the top surface is smaller than or equal to that of the bottom surface, and in the view direction perpendicular to the top surface, the outer contour line of the top surface does not exceed the range of the sealing area surrounded by the outer contour line of the bottom surface. Therefore, the ratio of the ultrasonic reflection signal reflected by the bottom surface to the side wall provided with the acoustic wave diversion block 2 is higher, the proportion of the ultrasonic reflection signal is larger, the influence of the inherent wave on the defect detection result can be further reduced, and the ultrasonic imaging quality can be improved.

Further, two sides of the sound-transmitting block 1 of the present embodiment are respectively provided with parallel planar side walls 1c parallel to the sound wave diffusion direction, and other side walls 1d located between the two parallel planar side walls 1c are respectively provided with a sound wave guide block 2, as shown in fig. 1 and fig. 2. In this embodiment, the figures obtained by cutting the sound-transmitting block 1 on any plane parallel to the parallel plane side wall are all trapezoidal, that is, the geometric size of the top surface of the sound-transmitting block 1 in this embodiment is smaller than that of the bottom surface, so that the absorption ratio of the ultrasonic reflection signal can be improved. Of course, the acoustic wave diversion block 2 may be disposed on all the side walls of the acoustic transmission block 1, and the absorption rate of the ultrasonic reflection signal diffused to the side walls of the acoustic transmission block 1 can be similarly improved, which will not be described again

Further, a saw tooth structure engaged with each other is arranged between the sound wave diversion block 2 and the sound transmission block 1, as shown in fig. 2, the saw tooth structure includes saw teeth respectively arranged on the side walls of the sound wave diversion block 2 and the sound transmission block 1 in an array manner. Specifically, the acoustic wave diversion block 2 can be attached to the side wall of the acoustic transmission block 1 by bonding or pouring, the acoustic wave diversion block 2 of the embodiment is formed by curing a mixture of low-density epoxy resin and metal oxide, and the acoustic wave diversion block 2 is arranged on the side wall of the acoustic transmission block 1 by pouring, that is, the mixture of the low-density epoxy resin and the metal oxide is directly poured on the corresponding side wall of the acoustic wave diversion block 2 to be directly cured and molded into the acoustic wave diversion block 2.

Further, the ratio of the absolute value of the difference between the acoustic impedance of the acoustic wave current guide block 2 and the acoustic impedance of the acoustic transmission block 1 to the acoustic impedance of the acoustic transmission block 1 is less than or equal to 10%; the acoustic impedance of the acoustic waveguide block 2 of this embodiment is 2.5 Mraly. The attenuation coefficient of the acoustic wave conduction block 2 to the acoustic wave is larger than that of the acoustic transmission block 1 to the acoustic wave.

Further, the sound-transmitting block 1 is made of polystyrene, organic glass or polyimide, and the sound-transmitting block 1 of the present embodiment is made of polystyrene, and the acoustic impedance thereof is 2.45 Mrayl.

The embodiment further provides an ultrasonic probe, which includes an ultrasonic transducer, and the ultrasonic transducer is attached with the delay block capable of optimizing the natural wave, which will not be described in detail.

The delay block of the inherent wave can be optimized in the embodiment, the sound wave guide flow block is arranged on the side wall of the sound transmission block in the diffusion direction of sound wave emission, and the ultrasonic reflection signal diffused to the side wall area where the sound wave guide flow block is located can be absorbed by the sound wave guide flow block, so that the influence of the inherent wave on the defect detection result can be reduced, and the ultrasonic imaging quality can be improved. In addition, after the sound transmission block is provided with the sound wave diversion block, the sound wave diversion block can absorb most of diffused ultrasonic reflection signals, and the influence of inherent waves on a detection result is reduced, so that the sizes of the sound transmission block and the whole delay block can be set to be smaller, the material consumption of the sound transmission block and the whole delay block can be effectively reduced, meanwhile, the delay block with the smaller size is more convenient to be used for detection operation in a narrow space, the requirement on the size of a detection object can be reduced, the detectable area of a size-limited workpiece is enlarged, and the detection blind area is correspondingly reduced.

As shown in fig. 3, the existing delay block (the left delay block in fig. 3) and the delay block (the right delay block in fig. 3) capable of optimizing the natural wave in this embodiment are respectively connected to the ultrasonic probe having the same parameters, and the parameters of the ultrasonic detection apparatus are set to be completely the same, and are used for respectively detecting the bottom wave of the test block, on this basis, the same gain (24dB) is respectively increased until the difference is obvious, and finally, the ultrasonic imaging pair is shown in fig. 4 and 5, and the data pair of the ultrasonic imaging is shown in table 1. After the delay block of the natural wave can be optimized by adopting the embodiment, the signal-to-noise ratio is greatly improved, and the size of the delay block is smaller.

TABLE 1 ultrasound imaging data comparison

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.