Method, device and equipment for surveying and mapping propagation direction of ultrasonic body wave and medium

Abstract

The invention discloses a method, a device, equipment and a medium for surveying and mapping the propagation direction of an ultrasonic body wave. The method comprises the following steps: controlling a laser to output scanning laser; the polygon mirror is controlled to rotate at a preset number of preset rotating speeds, so that the scanning laser scans the surface, close to one side of the optical transducer, of the isotropic material to be detected at corresponding different preset scanning speeds; acquiring propagation direction angles of ultrasonic body wave wavefront signals corresponding to different preset scanning speeds; recording time domain amplitude signals of the ultrasonic body wave wavefront signals on the preset detection points corresponding to different preset scanning speeds; and drawing a polar coordinate graph according to the time domain amplitude signal corresponding to the propagation direction angle of the wavefront signal of the ultrasonic body wave. According to the method, the time domain amplitude signals of the ultrasonic body wave wavefront signals on the preset detection points corresponding to different preset scanning speeds are recorded, and the polar coordinate graph is drawn according to the time domain amplitude signals corresponding to the propagation direction angles of the ultrasonic body wave wavefront signals, so that the efficiency of surveying and mapping the propagation direction of the ultrasonic body wave can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic body wave propagation direction mapping, and particularly to a method, device, equipment and medium for mapping the propagation direction of ultrasonic body waves. Background Art

[0002] Methods for mapping the propagation directions of body waves (longitudinal waves, transverse waves) in isotropic materials commonly include experimental measurement methods, numerical simulation methods, and acoustic imaging methods.

[0003] The experimental measurement method is to introduce an excitation source, such as a tapping or vibration source, into the material, and then use a sensor to measure the propagation direction and speed of the wave. However, it may be necessary to make the material into a special structure, such as a semi-circular structure, in order to measure ultrasonic signals at different direction angles. The numerical simulation method is to use computer simulation software, such as finite element analysis software, to model the elastic material and simulate the wave propagation process. By observing the simulation results, the wave propagation direction can be determined. However, the simulation results may be affected by model assumptions and parameter selections, and there may be certain errors. The acoustic imaging method is to use acoustic imaging techniques, such as ultrasonic imaging or acoustic emission imaging, to image the elastic material. However, special imaging equipment and techniques are required, and professional operations and interpretations may be needed. Summary of the Invention

[0004] The present invention provides a method, device, equipment and medium for mapping the propagation direction of ultrasonic body waves. By recording the time-domain amplitude signals of the ultrasonic body wave front signals at preset detection points corresponding to different preset scanning speeds, and drawing a polar coordinate diagram according to the time-domain amplitude signals corresponding to the propagation direction angles of the ultrasonic body wave front signals, the efficiency of mapping the propagation direction of ultrasonic body waves can be improved.

[0005] In a first aspect, an embodiment of the present invention provides a method for mapping the propagation direction of ultrasonic body waves, which uses an optical transducer to excite ultrasonic body waves, and the optical transducer is arranged on one side of the to-be-tested isotropic material;

[0006] The optical transducer includes: a laser, a multi-faceted mirror, and a controller;

[0007] The laser is used to output scanning laser, and the scanning laser irradiates on the multi-faceted mirror; the multi-faceted mirror rotates under the control of the controller, and the multi-faceted mirror reflects the scanning laser to the surface of the to-be-tested isotropic material close to the side of the optical transducer, exciting an ultrasonic body wave front signal;

[0008] The method for mapping the propagation direction of ultrasonic body waves includes:

[0009] Controlling the laser to output scanning laser;

[0010] Control the multifaceted mirror to rotate at a preset number of preset rotation speeds, so that the scanning laser scans the surface of the to-be-tested isotropic material close to the optical transducer side at corresponding different preset scanning speeds;

[0011] Obtain the propagation direction angles of the ultrasonic body wavefront signals corresponding to different preset scanning speeds;

[0012] Record the time-domain amplitude signals of the ultrasonic body wavefront signals at preset detection points corresponding to different preset scanning speeds, and the preset detection points are located on the surface of the to-be-tested isotropic material far from the optical transducer side;

[0013] Draw a polar plot according to the time-domain amplitude signals corresponding to the propagation direction angles of the ultrasonic body wavefront signals.

[0014] Optionally, obtaining the propagation direction angles of the ultrasonic body wavefront signals corresponding to different preset scanning speeds includes:

[0015] Obtain the propagation direction angle of the ultrasonic body wavefront signal according to the geometric relationship;

[0016] The geometric relationship includes: where θ is the propagation direction angle of the ultrasonic body wavefront signal, V us is the propagation speed of the ultrasonic body wavefront signal, and V is the preset scanning speed.

[0017] Optionally, the preset number of preset scanning speeds are all greater than the ultrasonic shear wave speed and less than the ultrasonic longitudinal wave speed.

[0018] Optionally, the ultrasonic body wavefront signal includes an ultrasonic shear wavefront signal.

[0019] Optionally, the preset number of preset scanning speeds are all greater than the ultrasonic longitudinal wave speed.

[0020] Optionally, the ultrasonic body wavefront signal includes an ultrasonic longitudinal wavefront signal.

[0021] Optionally, the scanning laser is a continuous laser.

[0022] In a second aspect, an embodiment of the present invention further provides a device for mapping the propagation direction of ultrasonic body waves, including:

[0023] A laser control module for controlling the laser to output a scanning laser;

[0024] A multifaceted mirror control module for controlling the multifaceted mirror to rotate at a preset number of preset rotation speeds, so that the scanning laser scans the surface of the to-be-tested isotropic material close to the optical transducer side at corresponding different preset scanning speeds;

[0025] A propagation direction angle acquisition module, configured to acquire the propagation direction angles of ultrasonic body wavefront signals corresponding to different preset scanning speeds;

[0026] A time-domain signal amplitude recording module, configured to record the time-domain amplitude signals of ultrasonic body wavefront signals at a preset detection point corresponding to different preset scanning speeds, where the preset detection point is located on the surface of the to-be-detected isotropic material away from the optical transducer;

[0027] A polar coordinate plot drawing module, configured to draw a polar coordinate plot according to the time-domain amplitude signals corresponding to the propagation direction angles of the ultrasonic body wavefront signals.

[0028] In a third aspect, an embodiment of the present invention further provides a device for mapping the propagation direction of ultrasonic body waves. The device for mapping the propagation direction of ultrasonic body waves includes:

[0029] At least one processor; and

[0030] A memory communicatively connected to the at least one processor; wherein,

[0031] The memory stores a computer program executable by the at least one processor. When the computer program is executed by the at least one processor, the at least one processor is enabled to execute the method for mapping the propagation direction of ultrasonic body waves as described in the first aspect.

[0032] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium. The computer-readable storage medium stores computer instructions, and when the computer instructions are executed by a processor, the method for mapping the propagation direction of ultrasonic body waves as described in the first aspect is implemented.

[0033] An embodiment of the present invention provides a method, device, equipment and medium for mapping the propagation direction of ultrasonic body waves. In the embodiment of the present invention, an optical transducer is used to excite ultrasonic body waves, and the optical transducer is arranged on one side of the isotropic material to be measured; the optical transducer includes: a laser, a polygon mirror and a controller; the laser is used to output a scanning laser, and the scanning laser irradiates on the polygon mirror; the polygon mirror rotates under the control of the controller, and the polygon mirror reflects the scanning laser to the surface of the isotropic material to be measured close to the optical transducer side, exciting an ultrasonic body wave front signal; the method for mapping the propagation direction of ultrasonic body waves includes: controlling the laser to output a scanning laser; controlling the polygon mirror to rotate at a preset number of preset rotation speeds, so that the scanning laser scans the surface of the isotropic material to be measured close to the optical transducer side at corresponding different preset scanning speeds; obtaining the propagation direction angles of the ultrasonic body wave front signals corresponding to different preset scanning speeds; recording the time-domain amplitude signals of the ultrasonic body wave front signals at preset detection points corresponding to different preset scanning speeds, and the preset detection points are located on the surface of the isotropic material to be measured far from the optical transducer side; drawing a polar coordinate diagram according to the time-domain amplitude signals corresponding to the propagation direction angles of the ultrasonic body wave front signals. By recording the time-domain amplitude signals of the ultrasonic body wave front signals at preset detection points corresponding to different preset scanning speeds and drawing a polar coordinate diagram according to the time-domain amplitude signals corresponding to the propagation direction angles of the ultrasonic body wave front signals, the embodiment of the present invention can improve the efficiency of mapping the propagation direction of ultrasonic body waves.

[0034] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1 It is a schematic structural diagram of an optical transducer provided by an embodiment of the present invention;

[0037] Figure 2 It is a flowchart of a method for mapping the propagation direction of ultrasonic body waves provided by an embodiment of the present invention;

[0038] Figure 3 It is a schematic diagram of the propagation direction of an ultrasonic signal provided by an embodiment of the present invention;

[0039] Figure 4Schematic structural diagram of a device for mapping the propagation direction of ultrasonic body waves provided by an embodiment of the present invention;

[0040] Figure 5 Schematic structural diagram of a device for mapping the propagation direction of ultrasonic body waves provided by an embodiment of the present invention. Detailed implementation manners

[0041] 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 with reference to 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and do not necessarily need 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 herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily 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.

[0043] Figure 1 Schematic structural diagram of an optical transducer provided by an embodiment of the present invention. In the embodiment of the present invention, an optical transducer is used to excite ultrasonic body waves. Refer to Figure 1 , the optical transducer 100 is disposed on one side of the isotropic material 200 to be measured. The optical transducer 100 includes: a laser 110, a polygon mirror 120, and a controller 130.

[0044] In the embodiment of the present invention, the laser 110 is used to output a scanning laser 1. Refer to Figure 1 , the scanning laser 1 irradiates on the polygon mirror 120. The polygon mirror 120 rotates under the control of the controller 130. The polygon mirror 120 reflects the scanning laser 1 to the surface of the isotropic material 200 to be measured on the side close to the optical transducer 100, exciting an ultrasonic body wave front signal.

[0045] It should be noted that Figure 1 both the laser 110 and the polygon mirror 120 in Figure 1 are connected to the controller 130 in a wired or wireless manner (not shown in

[0046] Figure 2 This is a flowchart of a method for mapping the propagation direction of ultrasonic body waves provided by an embodiment of the present invention. Refer to Figure 2 , the method for mapping the propagation direction of ultrasonic body waves includes the following steps:

[0047] S310. Control the laser to output scanning laser.

[0048] Optionally, on the basis of the above embodiment, the scanning laser is a continuous laser.

[0049] S320. Control the polygon mirror to rotate at a preset number of preset rotation speeds, so that the scanning laser scans the surface of the to-be-tested isotropic material near the optical transducer at corresponding different preset scanning speeds.

[0050] It can be understood that, continuing to refer to Figure 1 , by controlling the rotation of the polygon mirror 120 at a preset rotation speed n, it is possible to move the scanning laser 1 from the first position A to the second position B on the surface of the to-be-tested isotropic material 200 at a preset scanning speed V, and excite ultrasonic signals. Among them, the preset scanning speed V of the scanning laser 1 depends on the rotation speed n of the polygon mirror 120 and the vertical distance d from the surface of the polygon mirror 120 to the surface of the to-be-tested isotropic material 200 near the optical transducer 100. It should be noted that at all positions where the scanning laser 1 moves, the surface of the to-be-tested isotropic material 200 will absorb part of the energy of the scanning laser 1 and convert it into heat energy, generating a large local temperature gradient near the irradiation area of the scanning laser 1, resulting in the generation of thermal stress and thus exciting ultrasonic signals.

[0051] Figure 3 This is a schematic diagram of the propagation direction of ultrasonic signals provided by an embodiment of the present invention. For the convenience of understanding the solution of the embodiment of the present invention, refer to Figure 1 and Figure 3 , Figure 3Take point a as the starting point for the scanning laser 1 to move on the surface of the to-be-tested isotropic material 200 near the optical transducer 100. When the scanning laser 1 irradiates point a, compared with the entire moving process, this stage is very short. However, as long as the power of the scanning laser 1 is high enough, it is sufficient to provide the energy required to excite the ultrasonic signal. At this time, the area near the surface of point a absorbs energy and excites an ultrasonic signal that propagates in the to-be-tested isotropic material 200. It should be noted that in different bulk materials, the propagation direction of the ultrasonic body wave is different, depending on the material properties themselves. After a very short time, the scanning laser 1 moves to the next position b, and point b repeats the physical process of point a, also exciting an ultrasonic signal. During the process of the scanning laser 1 moving from point a to point b, the only difference between the ultrasonic signals excited at point a and point b is that the ultrasonic signal excited at point a propagates farther in the same direction. As the scanning laser 1 continues to move, the above process is continuously repeated, connecting the ultrasonic signals at different excitation points to form an internal ultrasonic body wave front signal w. Assuming that the size of the to-be-tested isotropic material 200 is large enough, ultrasonic signals penetrating the thickness direction can be generated and propagate simultaneously along the directions perpendicular to the ultrasonic propagation direction and the moving direction of the scanning laser 1.

[0052] Among them, the preset quantity can be set according to requirements. The larger the quantity, the more accurate the result of mapping the ultrasonic propagation direction.

[0053] S330. Obtain the propagation direction angles of the ultrasonic body wave front signals corresponding to different preset scanning speeds.

[0054] Optionally, step S130 includes: obtaining the propagation direction angle of the ultrasonic body wave front signal according to the geometric relationship. The geometric relationship includes: Among them, θ is the propagation direction angle of the ultrasonic body wave front signal, V us is the propagation speed of the ultrasonic body wave front signal, and V is the preset scanning speed.

[0055] It can be understood that from a mathematical perspective, it is known that |sinθ| ≤ 1. At the same time, for a given homogeneous isotropic material, the propagation speed of the ultrasonic body wave in the medium is constant. Only when the moving speed of the scanning laser 1 on the surface of the to-be-tested isotropic material 200 (preset scanning speed V) satisfies a certain range can an ultrasonic body wave front signal propagating along the moving direction of the scanning laser 1 be excited.

[0056] S340. Record the time-domain amplitude signals of the ultrasonic body wave front signals at the preset detection points corresponding to different preset scanning speeds. The preset detection points are located on the surface of the to-be-tested isotropic material far from the optical transducer.

[0057] Among them, the number of preset detection points can be set according to the actual situation. The larger the number, the more accurate the result of mapping the ultrasonic propagation direction.

[0058] Continue to refer to Figure 1 and Figure 3 , the preset detection point 300 is located on the surface of the isotropic material 200 to be measured on the side away from the optical transducer 100.

[0059] S350. Plot a polar coordinate graph based on the time-domain amplitude signal corresponding to the propagation direction angle of the ultrasonic body wavefront signal.

[0060] In the embodiment of the present invention, by recording the time-domain amplitude signals of the ultrasonic body wavefront signals at the preset detection point 300 corresponding to different preset scanning speeds V, and plotting a polar coordinate graph based on the time-domain amplitude signals corresponding to the propagation direction angles of the ultrasonic body wavefront signals, the mapping of the propagation directivity graph of the ultrasonic body waves inside the opaque material is realized, which helps to improve the detection efficiency of various defects inside the material. By using this method to understand the propagation directivity graphs of the ultrasonic longitudinal wavefront signals and ultrasonic transverse wavefront signals inside the material, reasonable ultrasonic excitation and reception positions can be set to receive reflection and transmission signals, improve the ultrasonic signal-to-noise ratio, and improve the internal defect detection efficiency. In addition, the full-optical excitation method is adopted, which has the advantages of non-contact and no need for a coupling agent.

[0061] Optionally, in one embodiment, the preset number of preset scanning speeds are all greater than the ultrasonic shear wave velocity and less than the ultrasonic longitudinal wave velocity.

[0062] It should be noted that for a given homogeneous isotropic material, the wave velocity V l of the ultrasonic longitudinal wavefront signal and the wave velocity V s of the ultrasonic transverse wavefront signal in the material are constant, and at the same time satisfy V l >V s . It can be known from the mathematical geometric relationship that when the preset scanning speed V satisfies V s <V<V l , a single ultrasonic transverse wavefront signal can be excited and propagated along the moving direction of the scanning laser 1 and perpendicular to the ultrasonic propagation direction. The wavefront angle θ s of the ultrasonic transverse wavefront signal satisfies

[0063] Optionally, on the basis of the above embodiment, the ultrasonic body wavefront signal includes an ultrasonic transverse wavefront signal.

[0064] It should be noted that the propagation direction angle θ′ of the ultrasonic transverse wavefront signal is equal to the wavefront angle θ s of the ultrasonic transverse wavefront signal, that is, θ′ = θ sDuring the movement excitation of the scanning laser 1, the time-domain amplitude signal of the wavefront signal is recorded through a plurality of preset detection points 300. Finally, the time-domain amplitude signals of the propagation direction angles θ′ of different ultrasonic shear wavefront signals are used to draw the propagation direction diagram of the ultrasonic shear wavefront signal in the isotropic material 200 to be measured. The specific operation is to parametrically change the magnitude of the preset scanning speed V under the premise of satisfying V s <V<V l to obtain the wavefront angle θ of different ultrasonic shear wavefront signals s corresponding to the time-domain amplitude signal of the ultrasonic shear wavefront signal, that is, the amplitude signal corresponding to the propagation direction angle θ′ of different ultrasonic shear wavefront signals. Then, according to the amplitudes corresponding to different direction angles θ′ of the ultrasonic shear wavefront signal, a polar coordinate diagram is drawn, and the propagation direction diagram of the ultrasonic shear wavefront signal inside the isotropic material 200 to be measured can be obtained.

[0065] Optionally, in another embodiment, the preset number of preset scanning speeds are all greater than the ultrasonic longitudinal wave speed.

[0066] It should be noted that when the preset scanning speed V is greater than the ultrasonic longitudinal wave speed V l , an ultrasonic longitudinal wavefront signal can be excited and propagated along the moving direction of the scanning laser 1 and perpendicular to the ultrasonic propagation direction. The wavefront angle θ of the ultrasonic longitudinal wavefront signal l satisfies In the case of V>V l , the generation of the ultrasonic shear wavefront signal can also be satisfied simultaneously. The calculation method of the wavefront angle θ of the shear wavefront signal also satisfies s

[0067] Optionally, on the basis of the above embodiment, the ultrasonic body wavefront signal includes the ultrasonic longitudinal wavefront signal.

[0068] It should be noted that when the preset scanning speed V is greater than the wave speed V of the ultrasonic longitudinal wavefront signal l , parametrically changing the magnitude of the preset scanning speed V to obtain the time-domain amplitude signal of the ultrasonic longitudinal wavefront signal corresponding to the wavefront angle θ of different ultrasonic longitudinal wavefront signals, that is, the amplitude signal corresponding to the propagation direction angle θ′ of the ultrasonic longitudinal wavefront signal. Then, according to the amplitudes corresponding to different direction angles θ′ of different ultrasonic longitudinal wavefront signals, a polar coordinate diagram is drawn, and the propagation direction diagram of the ultrasonic longitudinal wavefront signal inside the bulk material can be obtained.

[0069] Figure 4 is a schematic structural diagram of a device for mapping the propagation direction of ultrasonic body waves provided by an embodiment of the present invention. Refer to Figure 4 ​, the device includes: a laser control module 410, a polygon mirror control module 420, a propagation direction angle acquisition module 430, a time-domain signal amplitude recording module 440, and a polar plot drawing module 450.

[0070] In an embodiment of the present invention, the laser control module 410 is used to control the laser to output scanning laser. The polygon mirror control module 420 is used to control the polygon mirror to rotate at a preset number of preset rotation speeds, so that the scanning laser scans the surface of the to-be-measured isotropic material close to the optical transducer side at corresponding different preset scanning speeds. The propagation direction angle acquisition module 430 is used to acquire the propagation direction angles of the ultrasonic body wave front signals corresponding to different preset scanning speeds. The time-domain signal amplitude recording module 440 is used to record the time-domain amplitude signals of the ultrasonic body wave front signals at a preset detection point corresponding to different preset scanning speeds, and the preset detection point is located on the surface of the to-be-measured isotropic material far from the optical transducer side. The polar plot drawing module 450 is used to draw a polar plot according to the time-domain amplitude signals corresponding to the propagation direction angles of the ultrasonic body wave front signals.

[0071] The device for mapping the propagation direction of ultrasonic body waves provided in the embodiment of the present invention is used to implement all the technical features of the method for mapping the propagation direction of ultrasonic body waves provided in the above embodiment, so it has the same beneficial effects and will not be described in detail here. For the content not described in detail in the embodiment of the present invention, please refer to the method for mapping the propagation direction of ultrasonic body waves provided in the above embodiment.

[0072] Figure 5 It is a schematic structural diagram of a device for mapping the propagation direction of ultrasonic body waves provided in an embodiment of the present invention. Refer to Figure 5 , the device 10 for mapping the propagation direction of ultrasonic body waves is intended to represent various forms of digital computers, such as, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, personal digital processors, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are only examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0073] As Figure 5As shown, the device 10 for mapping the propagation direction of ultrasonic body waves includes at least one processor 11 and a memory communicatively connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc. Among them, the memory stores a computer program executable by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the device 10 for mapping the propagation direction of ultrasonic body waves can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0074] Multiple components in the device 10 for mapping the propagation direction of ultrasonic body waves are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disc, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the device 10 for mapping the propagation direction of ultrasonic body waves to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0075] The processor 11 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the method for mapping the propagation direction of ultrasonic body waves.

[0076] In some embodiments, the method for mapping the propagation direction of ultrasonic body waves can be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the device 10 for mapping the propagation direction of ultrasonic body waves via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for mapping the propagation direction of ultrasonic body waves described above can be executed. Alternatively, in other embodiments, the processor 11 can be configured to execute the method for mapping the propagation direction of ultrasonic body waves in any other appropriate way (for example, by means of firmware).

[0077] The various embodiments of the systems and techniques described above in this specification can be implemented in digital electronic circuitry, integrated circuit systems, field programmable gate arrays (FPGA), application specific integrated circuits (ASIC), application specific standard products (ASSP), systems on a chip (SOC), complex programmable logic devices (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include: being implemented in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be a special-purpose or general-purpose programmable processor that receives data and instructions from, and transmits data and instructions to, a storage system, at least one input device, and at least one output device.

[0078] The computer program for implementing the methods of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions / operations specified in the flowchart and / or block diagram to be implemented. The computer program can be executed entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine or entirely on the remote machine or server.

[0079] In the context of the present invention, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer-readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, the computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0080] To provide interaction with a user, the systems and techniques described herein can be implemented on a device that maps the direction of ultrasonic body wave propagation, the device having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and a pointing device (e.g., a mouse or a trackball), by which the user can provide input to the device that maps the direction of ultrasonic body wave propagation. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0081] The systems and techniques described herein can be implemented in a computing system including backend components (e.g., as a data server), or a computing system including middleware components (e.g., an application server), or a computing system including frontend components (e.g., a user computer having a graphical user interface or a web browser through which the user can interact with an implementation of the systems and techniques described herein), or a computing system including any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected to each other by digital data communication in any form or medium (e.g., a communication network). Examples of communication networks include: local area network (LAN), wide area network (WAN), blockchain network, and the Internet.

[0082] A computing system can include a client and a server. The client and the server are generally remote from each other and typically interact through a communication network. The client-server relationship is created by computer programs running on respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or a cloud host, which is a host product in the cloud computing service system and solves the defects of difficult management and weak business scalability existing in traditional physical hosts and VPS services.

[0083] It should be understood that various forms of the processes shown above can be used, with steps reordered, added, or deleted. For example, the steps recited in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is imposed herein.

[0084] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for mapping the propagation direction of ultrasonic body waves, characterized in that An optical transducer is used to excite ultrasonic body waves, and the optical transducer is arranged on one side of the isotropic material to be measured; The optical transducer includes: a laser, a polygon mirror, and a controller; The laser is used to output scanning laser, and the scanning laser irradiates on the polygon mirror; the polygon mirror rotates under the control of the controller, and the polygon mirror reflects the scanning laser to the surface of the isotropic material to be measured close to the side of the optical transducer, exciting an ultrasonic body wave front signal; The method for mapping the propagation direction of ultrasonic body waves includes: Controlling the laser to output scanning laser; Controlling the polygon mirror to rotate at a preset number of preset rotation speeds, so that the scanning laser scans the surface of the isotropic material to be measured close to the side of the optical transducer at corresponding different preset scanning speeds; Obtaining the propagation direction angles of the ultrasonic body wave front signals corresponding to different preset scanning speeds; Recording the time-domain amplitude signals of the ultrasonic body wave front signals at preset detection points corresponding to different preset scanning speeds, and the preset detection points are located on the surface of the isotropic material to be measured far from the side of the optical transducer; Drawing a polar coordinate diagram according to the time-domain amplitude signals corresponding to the propagation direction angles of the ultrasonic body wave front signals.

2. The method for mapping the propagation direction of ultrasonic body waves according to claim 1, wherein Obtaining the propagation direction angles of the ultrasonic body wave front signals corresponding to different preset scanning speeds includes: Obtaining the propagation direction angle of the ultrasonic body wave front signal according to geometric relationships; The geometric relationship includes: where θ is the propagation direction angle of the ultrasonic body wave front signal, V us is the propagation speed of the ultrasonic body wave front signal, and V is the preset scanning speed.

3. The method for mapping the propagation direction of ultrasonic body waves according to claim 1, characterized in that All the preset number of preset scanning speeds are greater than the ultrasonic shear wave speed and less than the ultrasonic longitudinal wave speed.

4. The method for measuring the propagation direction of ultrasonic body waves according to claim 2, characterized in that The ultrasonic body wave front signal includes an ultrasonic shear wave front signal.

5. The method for mapping the propagation direction of ultrasonic body waves according to claim 1, wherein All the preset number of preset scanning speeds are greater than the ultrasonic longitudinal wave speed.

6. The method for mapping the propagation direction of ultrasonic body waves according to claim 5, wherein The ultrasonic body wave front signal includes an ultrasonic longitudinal wave front signal.

7. The method for mapping the propagation direction of ultrasonic body waves according to claim 1, wherein The scanning laser is continuous laser.

8. A device for measuring the propagation direction of ultrasonic body waves, characterized in that, It includes: A laser control module for controlling the laser to output scanning laser; A polygon mirror control module for controlling the polygon mirror to rotate at a preset number of preset rotation speeds, so that the scanning laser scans the surface of the isotropic material to be measured close to the side of the optical transducer at corresponding different preset scanning speeds; A propagation direction angle acquisition module for obtaining the propagation direction angles of the ultrasonic body wave front signals corresponding to different preset scanning speeds; A time-domain signal amplitude recording module for recording the time-domain amplitude signals of the ultrasonic body wave front signals at preset detection points corresponding to different preset scanning speeds, and the preset detection points are located on the surface of the isotropic material to be measured far from the side of the optical transducer; A polar coordinate diagram drawing module for drawing a polar coordinate diagram according to the time-domain amplitude signals corresponding to the propagation direction angles of the ultrasonic body wave front signals.

9. An apparatus for measuring the propagation direction of ultrasonic body waves, characterized in that, The device for mapping the propagation direction of ultrasonic body waves includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and when the computer program is executed by the at least one processor, enables the at least one processor to execute the method for mapping the propagation direction of an ultrasonic body wave according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for implementing the method for mapping the propagation direction of an ultrasonic body wave according to any one of claims 1-7 when the computer instructions are executed by a processor.

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