阅读说明：本技术 周期性磁体柔性电磁超声探头 (Flexible electromagnetic ultrasonic probe of periodic magnet ) 是由 郑阳 张宗健 谭继东 于 2020-04-27 设计创作，主要内容包括：本说明书提供一种周期性磁体柔性电磁超声探头,包括：多个周期性磁体、柔性连接单元及换能线圈；多个周期性磁体并排设置并与柔性连接单元固定连接,使得各周期性磁体之间的夹角可根据被检表面的形状改变,换能线圈设置在多个周期性磁体下方。本申请能够提高电磁超声探头的检测适应性,实现单个探头适用多种被检对象表面,在不同表面状态下均可获得良好的检测效果。(The present specification provides a periodic magnet flexible electromagnetic ultrasound probe comprising: the device comprises a plurality of periodic magnets, a flexible connecting unit and a transduction coil; the plurality of periodic magnets are arranged side by side and fixedly connected with the flexible connecting unit, so that the included angle between the periodic magnets can be changed according to the shape of the detected surface, and the energy conversion coil is arranged below the plurality of periodic magnets. The detection adaptability of the electromagnetic ultrasonic probe can be improved, the single probe is suitable for the surfaces of various detected objects, and good detection effects can be obtained under different surface states.)

1. A periodic magnet flexible electromagnetic ultrasound probe, comprising: the device comprises a plurality of periodic magnets, a flexible connecting unit and a transduction coil;

the periodic magnets are arranged side by side and fixedly connected with the flexible connecting unit, so that the included angle between the periodic magnets can be changed according to the shape of the surface to be detected; the transduction coil is disposed below the plurality of periodic magnets.

2. The periodic magnet flexible electromagnetic ultrasound probe of claim 1, wherein the flexible connection unit comprises: the permanent magnet synchronous motor comprises a plurality of fixing parts and a plurality of revolute pairs, wherein each fixing part is fixedly connected with a periodic magnet, and adjacent fixing parts are connected through the revolute pairs.

3. The periodic magnet flexible electromagnetic ultrasound probe of claim 1, wherein the transduction coil is a meander coil having a long straight wire segment directly below a corresponding periodic magnet.

4. The periodic magnet flexible electromagnetic ultrasound probe of claim 1, wherein the transduction coil is a meander coil having long straight wire segments of wire located below the space between each periodic magnet.

5. The periodic magnet flexible electromagnetic ultrasound probe of claim 1, wherein the transduction coil is a racetrack coil, the plurality of periodic magnets covering a long straight wire segment of wire of the racetrack coil.

6. The periodic magnet flexible electromagnetic ultrasound probe of claim 1, wherein the transduction coil is a phased array coil disposed directly beneath the plurality of periodic magnets or beneath a space between each periodic magnet.

7. The periodic magnet flexible electromagnetic ultrasound probe of claim 1, further comprising: a flexible enclosure for effecting integral encapsulation of the probe.

8. The periodic magnet flexible electromagnetic ultrasound probe of claim 1, further comprising: and the protective layer is arranged below the transduction coil.

9. The periodic magnet flexible electromagnetic ultrasound probe of claim 1, further comprising: an elastic connection body disposed between the periodic magnet units.

10. The periodic magnet flexible electromagnetic ultrasonic probe of claim 8, wherein the flexible package housing is provided with a signal connector or a signal connection line for connecting an external detection instrument.

11. A periodic magnet flexible electromagnetic ultrasound probe according to any of claims 1 to 10, wherein adjacent periodic magnets are of opposite polarity.

Technical Field

The invention relates to the field of ultrasonic nondestructive testing, in particular to a flexible electromagnetic ultrasonic probe for a periodic magnet.

Background

Compared with the traditional piezoelectric ultrasonic detection technology, the electromagnetic ultrasonic detection technology has the advantages of no need of a coupling agent, no need of polishing, high repeated detection stability, suitability for extremely high and low temperature detection and the like. The main functional components of the electromagnetic ultrasonic probe are a transduction coil and a magnet, wherein the magnet provides a bias magnetic field, a high-frequency alternating current signal is introduced into the transduction coil, ultrasonic waves are excited in an object to be detected, and a detection echo signal is received. The electromagnetic ultrasonic probe can realize the excitation and the receiving of different types of ultrasonic waves, such as ultrasonic body waves, surface waves, guided waves and the like, by changing the forms of the energy conversion coil and the external bias magnetic field. At present, most of electromagnetic ultrasonic probes are designed by adopting permanent magnets with plane magnetic pole end faces, the front ends of the probes are of a plane type and can be well suitable for plane detected objects, but when the curved detected objects are detected, the front ends of the probes cannot be fit with the curved surfaces, so that the front ends of the probes are lifted and separated unevenly, and the influence on the energy conversion efficiency of the electromagnetic ultrasonic probes is large. Therefore, in order to adapt to a specific surface of an object to be inspected, it is often necessary to customize a magnet of a specific shape to design a dedicated electromagnetic ultrasound probe adapted to the surface to be inspected. However, the electromagnetic ultrasonic probe with the customized front end shape can only be applied to a specific surface of an object to be detected, and cannot be applied to surfaces with other shapes, and the application range is very limited.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the flexible electromagnetic ultrasonic probe with the periodic magnet, which improves the detection adaptability of the electromagnetic ultrasonic probe, realizes that a single probe is suitable for the surfaces of various detected objects, and can obtain good detection effect under different surface states.

In order to solve the technical problem, the application provides the following technical scheme:

the application provides a flexible electromagnetic ultrasonic probe of periodic magnet, includes: the device comprises a plurality of periodic magnets, a flexible connecting unit and a transduction coil;

the plurality of periodic magnets are arranged side by side and fixedly connected with the flexible connecting unit, so that the included angle between the periodic magnets can be changed according to the shape of the detected surface, and the energy conversion coil is arranged below the plurality of periodic magnets.

Further, the flexible connection unit includes: the permanent magnet synchronous motor comprises a plurality of fixing parts and a plurality of revolute pairs, wherein each fixing part is fixedly connected with a periodic magnet, and adjacent fixing parts are connected through the revolute pairs.

Furthermore, the energy conversion coil is a folded coil, and a long straight line segment lead of the folded coil is positioned right below the corresponding periodic magnet.

Furthermore, the energy conversion coil is a folded coil, and a long straight line section lead of the folded coil is positioned below the space between the periodic magnets.

Furthermore, the transduction coil is a runway-type coil, and the long straight-line-section conducting wire of the runway-type coil is covered by a plurality of periodic magnets.

Further, the transduction coil is a phased array coil disposed directly below the plurality of periodic magnets or disposed below a space between the periodic magnets.

Further, the flexible electromagnetic ultrasonic probe with periodic magnet further comprises: a flexible enclosure for effecting integral encapsulation of the probe.

Furthermore, the flexible electromagnetic ultrasonic probe of the periodic magnet further comprises a protective layer, and the protective layer is arranged below the transduction coil.

Further, the flexible electromagnetic ultrasonic probe with the periodic magnet further comprises an elastic connecting body, and the elastic connecting body is arranged between the periodic magnet units.

Furthermore, a signal connector or a signal connecting wire is arranged on the flexible packaging shell and used for connecting an external detection instrument.

Further, the polarities of adjacent periodic magnets are opposite.

According to the technical scheme, the flexible electromagnetic ultrasonic probe for the periodic magnet has the flexible connection unit, wherein the flexible connection unit comprises a plurality of fixing portions and a plurality of revolute pairs, each fixing portion is fixedly connected with the periodic magnet, the adjacent fixing portions are connected through the revolute pairs, and the revolute pairs can rotate by a certain angle between the magnetic units, so that the detection adaptability of the electromagnetic ultrasonic probe is improved, the single probe is suitable for multiple detected object surfaces, and good detection effects can be obtained under different surface states.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a first schematic structural diagram of a periodic magnet flexible electromagnetic ultrasonic probe in an embodiment of the present invention.

Fig. 2 is a schematic structural diagram ii of the periodic magnet flexible electromagnetic ultrasonic probe in the embodiment of the present invention.

Fig. 3 is a first schematic diagram illustrating the arrangement position of the meander coil relative to the periodic magnet according to an embodiment of the present invention.

Fig. 4 is a second schematic diagram of the arrangement position of the zigzag coil relative to the periodic magnet in the embodiment of the invention.

Fig. 5 is a schematic diagram of the placement of a racetrack-type coil relative to periodic magnets in an embodiment of the invention.

Fig. 6 is a first schematic diagram of the position of a phased array coil relative to a periodic magnet arrangement in an embodiment of the invention.

Fig. 7 is a second schematic diagram of the position of the phased array coil relative to the periodic magnet arrangement in an embodiment of the invention.

Fig. 8 is a first structural diagram of a periodic magnet flexible electromagnetic ultrasound probe in an embodiment of the invention.

Fig. 9 is a structural diagram two of the flexible electromagnetic ultrasonic probe with the periodic magnet according to the embodiment of the present invention.

Fig. 10 is a schematic diagram of a periodic magnet flexible electromagnetic ultrasonic probe implementing ultrasonic transverse waves in an embodiment of the invention.

Fig. 11 is a schematic diagram of an implementation of an ultrasonic longitudinal wave by the periodic magnet flexible electromagnetic ultrasonic probe in the embodiment of the invention.

Fig. 12 is a schematic diagram of a periodic magnet flexible electromagnetic ultrasound probe implementing surface waves in an embodiment of the present invention.

Fig. 13 is a waveform diagram of a surface wave excited by a periodic magnet flexible electromagnetic ultrasound probe in an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic structural diagram of a periodic magnet flexible electromagnetic ultrasonic probe according to an embodiment of the present invention, and as shown in fig. 1, the periodic magnet flexible electromagnetic ultrasonic probe includes: a plurality of periodic magnets 1, a flexible connection unit 2 and a transduction coil 3.

The plurality of periodic magnets 1 are arranged in parallel, and the polarities of adjacent periodic magnets 1 are opposite. The periodic magnet 1 may be a permanent magnet or an electromagnet, in a magnetic field generating manner; the periodic magnet 1 may be a hard or soft magnet according to the material classification of the magnet; the number of the periodic magnets 1 may be determined according to specific requirements, and is generally not less than 2.

In one embodiment, the plurality of periodic magnets 1 may be arranged in parallel at equal intervals.

The plurality of periodic magnets 1 are fixedly connected with the flexible connection unit 2, the flexible connection unit 2 can enable the adjacent periodic magnets 1 to be connected in a flexible connection mode, the flexible connection mode is a connection mode which allows the connection part to axially stretch and contract, turn and generate a certain displacement amount in a vertical axial direction, and through the flexible connection, the relative positions of the periodic magnets 1 can be changed according to different detected object surfaces 10, namely, the included angles between the periodic magnets are changed.

In one embodiment, the transduction coil 3 is arranged below the plurality of periodic magnets 1, the transduction coil 3 is used for realizing the excitation and the receiving of ultrasonic waves in the detected object, and when the ultrasonic waves are excited, high-frequency current is introduced into the transduction coil 3, and ultrasonic echoes in the detected workpiece are received in an induction mode. The transduction coil 3 can be a meander coil 31, a runway coil 32, a phased array coil 33, etc., and different types of coils adopt different setting modes, and can be excited in a detected object to generate different ultrasonic waves, such as ultrasonic transverse waves, longitudinal waves, surface waves, guided waves, phased array ultrasonic guided waves, etc.

Through set up flexible connection unit 2 between periodic magnet unit 1, guaranteed that every periodic magnet unit 1 all laminates with examined object surface 10 in the detection, improved electromagnetic ultrasonic probe's detection adaptability, set up through different grade type transducer coil 3 and a plurality of periodic magnet 1 cooperation, realized different detection demands.

In one embodiment, as shown in fig. 2, the flexible connection unit 2 includes: a plurality of fixing parts 4 and a plurality of rotating pairs 5, wherein each fixing part 4 is fixedly connected with one periodic magnet 1, and each rotating pair 5 can be connected with two periodic magnets 1 with opposite polarities through the fixing parts 4. The periodic magnets are connected through the revolute pair 5 and the fixing part 4 to form the integral flexible electromagnetic ultrasonic probe with the periodic magnets. The fixing means of the fixing part 4 can be gluing or screwing.

The rotating pair 5 is a movable connection structure, the periodic magnet units 1 can rotate around the rotating pair 5 for a certain angle, when the surface 10 to be detected is a curved surface and a probe is placed on the surface to be detected, the periodic magnets 1 can rotate around the rotating pair 5 according to the shape of the surface 10 to be detected, each periodic magnet 1 is ensured to be attached to the surface 10 to be detected, and the adaptability to the surface 10 to be detected is improved.

In an embodiment, the flexible connection unit 2 may also be flexibly connected to the periodic magnet 1 by other arrangements, such as a spring connection, a chain connection, and the like.

In one embodiment, as shown in fig. 3, the transduction coil 3 is a folded coil 31, and the folded coil 31 may be formed by winding a plurality of turns of wires, and the current directions of adjacent folded wires are opposite. The adjacent periodic magnets 1 have opposite polarities and are distributed at equal intervals, and the long straight-line segment lead of the folded coil 31 is positioned right below the corresponding periodic magnet 1. Ultrasonic transverse waves 11 and surface waves are generated in the detected object by excitation through a vertical bias magnetic field provided by the periodic magnet 1, the generated ultrasonic transverse waves can be used for thickness measurement and flaw detection, and the surface waves 15 can be used for detecting surface cracks.

In one embodiment, as shown in fig. 4, the transduction coil 3 is a folded coil 32, the adjacent periodic magnets 1 have opposite polarities and are distributed at equal intervals, and the long straight line segment of the folded coil 32 is located below the space between the periodic magnets 1. The horizontal magnetic field formed between the periodic magnets 1 is utilized to excite the workpiece to generate ultrasonic longitudinal waves 13, and the generated ultrasonic longitudinal waves can be used for thickness measurement and flaw detection.

In one implementation, as shown in fig. 5, the transduction coil 3 is a racetrack type coil 33, and the racetrack type transduction coil 33 can be a racetrack type coil wound by enameled wires or a racetrack type transduction coil made of a flexible printed circuit board PCB. The runway type transduction coil 33 is arranged below the periodic magnet 1, the periodic magnet 1 covers a long straight wire section of the runway type transduction coil 33, the polarities of the adjacent periodic magnets 1 are distributed in an opposite mode, and the distance between the periodic magnets 1 can be set according to the wavelength of ultrasonic guided waves. The vertical magnetic field formed by the periodic magnet 1 is utilized to excite the workpiece to generate ultrasonic guided waves, and the ultrasonic guided waves can realize large-area scanning.

In one embodiment, as shown in fig. 6 and 7, the transduction coil 3 is a phased array coil 34, the adjacent periodic magnets 1 have opposite polarities and are distributed at equal intervals, and when the phased array coil 34 is arranged right below the periodic magnets 1, excitation of a phased array ultrasonic transverse wave sound beam can be realized; when the phased array coil 34 is arranged between the periodic magnets 1, the excitation of the phased array ultrasonic longitudinal wave sound beam can be realized; the phased array ultrasonic transverse wave and the phased array ultrasonic longitudinal wave can be used for ultrasonic phased array imaging detection.

In one embodiment, the transduction coil 3 may be disposed opposite the periodic magnet 1 in other forms.

Fig. 8 and 9 are structural diagrams of a periodic magnet flexible electromagnetic ultrasonic probe according to an embodiment of the present invention, and as shown in fig. 9, the periodic magnet flexible electromagnetic ultrasonic probe includes a flexible package housing 9, a flexible connection unit 2, a periodic magnet 1, a transduction coil 3, an elastic connection body 6, a protective layer 7, and a signal connector or signal connection line 8. The whole probe is encapsulated by the flexible encapsulating shell 9, so that on one hand, each functional component of the probe is protected, on the other hand, the probe is suitable for various surfaces, and the flexible encapsulating shell 9 has certain elasticity, so that the expansion and contraction functions are convenient to realize.

The flexible packaging shell 9 is provided with a signal connector or a signal connecting wire 8, the signal connector or the signal connecting wire 8 is connected with the transduction coil 3 and can be connected with an external detection instrument through a signal cable, the communication between the probe and the external detection instrument is realized, and a detection signal obtained by detecting the detected surface 10 is transmitted to the external detection instrument for analysis. The flexible electromagnetic ultrasonic probe of the periodic magnet can also be provided with no signal connector or signal connecting wire 8, and the transduction coil 3 is directly connected with an external detection instrument through a signal lead.

A plurality of periodic magnets 1 and a plurality of elastic connecting bodies 6 are arranged in the flexible packaging shell 9, the polarities of the adjacent periodic magnets 1 are opposite, and the adjacent periodic magnets 1 are flexibly connected through a flexible connecting unit 2. The elastic connecting body 6 is arranged between the adjacent periodic magnets 1, the integrity of the periodic magnets 1 is guaranteed, and the elastic connecting body 6 has certain flexibility so as to realize the rotation between the periodic magnets 1. The elastic connection bodies 6 provided between the periodic magnets 1 are optional, and similar connection means may be provided according to the need.

The transduction coil 3 is arranged below the plurality of periodic magnets 1 and the plurality of elastic connecting bodies 6, and the material of the transduction coil 3 is flexible so as to be adaptive to different detected object surfaces 10.

The protective layer 7 is arranged below the transduction coil 3 and used for protecting functional devices inside the probe, and the protective layer 7 is made of flexible materials and can better adapt to the surface 10 of the detected object.

In one embodiment, as shown in fig. 10, the probe is disposed on the arc surface of a curved test piece 12, and is excited to generate ultrasonic transverse waves 11 in the curved test piece 12.

In one embodiment, as shown in fig. 11, the probe is disposed on the arc surface of the curved surface test piece 12, and is excited to generate an ultrasonic longitudinal wave 13 in the curved surface test piece 12.

In one embodiment, as shown in fig. 12, the object to be detected is a profile 14, the probe is disposed on the surface of the profile 14, and an ultrasonic surface wave 15 is excited in the profile 14, and the waveform of the ultrasonic surface wave is shown in fig. 13.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.