Target imaging method and system based on neighborhood sound field

Abstract

The present application provides a target imaging method and system based on a neighborhood sound field, the method comprising: collecting sound field distribution information of a neighborhood sound field of the sound field where the target object is located, including first sound field distribution information of a first neighborhood sound field; determining a closed surface based on the sound field edge of the sound field where the target object is located, and determining the sound pressure distribution information of the closed surface based on the first sound field distribution information of the first neighborhood sound field and a preset mapping relationship, so as to determine the target sound pressure distribution information of the sound field where the target object is located; the preset mapping relationship comprises: a mapping relationship between the sound pressure distribution and normal gradient distribution on the closed surface and the sound field distribution information of the internal sound field of the closed surface. The present application realizes acoustic imaging of the target object based on the mapping relationship of a mathematical model, bypassing the conventional geometric thinking of focusing and beamforming, and avoiding the fundamental contradiction in principle with the propagation characteristics of sound waves, which can effectively improve imaging quality and imaging resolution.

Description

Technical Field

[0001] The present application relates to the field of acoustic imaging technology, and in particular to a target imaging method and system based on a neighborhood sound field. Background Art

[0002] Sound waves are an irreplaceable carrier of information, possessing high research and application value in industries and scenarios such as industrial nondestructive testing, medical imaging, and ocean exploration. Compared to information carriers like light and microwaves, sound waves possess distinct mechanical vibrational properties. They possess significant penetration advantages in media such as underwater, non-transparent materials, and living tissues, making them irreplaceable in many non-line-of-sight information acquisition applications.

[0003] However, within the framework of classical information theory, the effective bandwidth of sound waves is relatively narrow, several orders of magnitude lower than that of light waves and microwaves. Therefore, current technologies primarily employ geometric concepts to focus sound waves and perform imaging through point-by-point and line-by-line scanning. However, the linear propagation characteristics of sound are not ideal. The diffusion effect of sound and the resulting numerous reflection, refraction, and scattering effects pose greater challenges to the focusing method, primarily in terms of imaging quality and resolution. This is primarily due to a fundamental contradiction between the propagation characteristics of sound waves and the quasi-geometric settings used in focusing. Summary of the Invention

[0004] Based on this, it is necessary to provide a target imaging method and system based on the neighborhood sound field to address the above technical problems, aiming to solve the technical problem that the imaging effect of the beam focusing acoustic imaging based on geometric ideas in the related technology is not ideal.

[0005] In a first aspect, the present application provides a target imaging method based on a neighborhood sound field, comprising:

[0006] Collecting sound field distribution information of at least one neighboring sound field of the sound field where the target object is located; the sound field distribution information of the neighboring sound field includes first sound field distribution information of at least one first neighboring sound field;

[0007] Determining an outward-oriented closed curved surface based on a sound field edge of the sound field where the target object is located, wherein the first neighborhood sound field is located inside the outward-oriented closed curved surface; and

[0008] Determining the sound pressure distribution information of the closed surface based on the first sound field distribution information of the at least one first neighborhood sound field and a preset mapping relationship, so as to determine the target sound pressure distribution information of the sound field where the target object is located;

[0009] Among them, the preset mapping relationship includes: the mapping relationship between the sound pressure distribution information and normal gradient distribution information on the closed surface and the sound field distribution information of the internal sound field of the closed surface, and the target sound pressure distribution information of the sound field where the target object is located can be used to realize acoustic imaging of the target object.

[0010] As an embodiment of the present application, determining the sound pressure distribution information of the closed surface based on the first sound field distribution information of the at least one first neighborhood sound field and a preset mapping relationship to determine the target sound pressure distribution information of the sound field where the target object is located includes:

[0011] Based on the first sound field distribution information of at least two first neighborhood sound fields and a preset mapping relationship, the high-resolution sound pressure distribution information of the closed surface is determined to determine the high-resolution target sound pressure distribution information of the sound field where the target object is located, wherein the high-resolution target sound pressure distribution information of the sound field where the target object is located can be used to achieve high-resolution acoustic imaging of the target object.

[0012] As an embodiment of the present application, the sound field distribution information of the neighborhood sound field further includes second sound field distribution information of at least one second neighborhood sound field;

[0013] The determining of an outward-oriented closed surface based on the sound field edge of the sound field where the target object is located includes:

[0014] Determining an outwardly oriented closed surface based on a sound field edge of the sound field where the target object is located and a sound field edge of the second neighborhood sound field;

[0015] The determining target sound pressure distribution information of the sound field where the target object is located includes:

[0016] Based on the sound pressure distribution information of the closed surface and the second sound field distribution information of the second neighborhood sound field, target sound pressure distribution information of the sound field where the target object is located is determined.

[0017] As an embodiment of the present application, the specific calculation formula for the mapping relationship between the sound pressure distribution information and the normal gradient distribution information on the closed surface in the preset mapping relationship and the sound field distribution information of the internal sound field of the closed surface is:

[0018] ;

[0019] in, is the sound field distribution of the internal sound field of the closed surface, That is, the internal area enclosed by the closed surface, S is a closed surface, Any point on the closed surface, is the sound field distribution on the closed surface, G is the Green function, n is the normal direction on the closed surface, is the surface normal gradient of the closed surface;

[0020] The determining of the sound pressure distribution information of the closed surface based on the first sound field distribution information of the at least one first neighborhood sound field and a preset mapping relationship includes:

[0021] The first sound field distribution information of the at least one first neighborhood sound field is substituted into the calculation formula as the sound field distribution of the internal sound field of the closed surface for calculation, so as to use the sound field distribution of the closed surface obtained by calculation as the sound pressure distribution information of the closed surface.

[0022] As an embodiment of the present application, collecting sound field distribution information of at least one neighboring sound field of the sound field where the target object is located includes:

[0023] emitting sound waves toward a target object through a transducer to form a sound field distribution in the vicinity of the target object;

[0024] The sound field distribution information of at least one neighboring sound field of the sound field where the target object is located is collected based on laser beam tomography.

[0025] As an embodiment of the present application, the method further includes:

[0026] Controlling the target object to vibrate so as to collect sound field distribution change characteristics of sound field distribution information of at least one neighboring sound field of the sound field where the target object is located;

[0027] A high-resolution acoustic imaging of the target object is determined based on the sound field distribution change characteristics.

[0028] In a second aspect, the present application also provides a target imaging system based on a neighborhood acoustic field, comprising a transducer, a rotating laser tomography assembly, and a processor;

[0029] The transducer is used to generate sound waves toward the target object to be imaged, so as to form a sound field distribution in the vicinity of the target object;

[0030] The rotating laser tomography component is used to collect sound field distribution information of at least one neighboring sound field of the sound field where the target object is located through laser beam tomography;

[0031] The processor is configured to determine an outwardly oriented closed curved surface based on a sound field edge of the sound field where the target object is located, wherein the first neighborhood sound field is located inside the outwardly oriented closed curved surface; and

[0032] Determining the sound pressure distribution information of the closed surface based on the first sound field distribution information of the at least one first neighborhood sound field and a preset mapping relationship, so as to determine the target sound pressure distribution information of the sound field where the target object is located;

[0033] Among them, the preset mapping relationship includes: the mapping relationship between the sound pressure distribution information and normal gradient distribution information on the closed surface and the sound field distribution information of the internal sound field of the closed surface, and the target sound pressure distribution information of the sound field where the target object is located can be used to realize acoustic imaging of the target object.

[0034] As an embodiment of the present application, the rotational laser tomography assembly includes: a laser generating device, a photoelectric receiver, and a motion mechanism, wherein the motion mechanism is used to drive the laser generating device and the photoelectric receiver to move in multiple planes;

[0035] The collecting of sound field distribution information of at least one neighboring sound field of the sound field where the target object is located by laser beam tomography includes:

[0036] collecting deflection information of the laser beam emitted by the laser generating device in at least one adjacent sound field through a photoelectric receiver, wherein the deflection information is used to indicate sound field distribution information of the adjacent sound field;

[0037] The laser generating device and the photoelectric receiver are driven to move on multiple planes by a motion mechanism, so as to determine the sound field distribution information of at least one neighboring sound field based on the deflection information of the laser beam on multiple planes within at least one neighboring sound field collected by the photoelectric receiver.

[0038] As an embodiment of the present application, the specific calculation formula for the mapping relationship between the sound pressure distribution information and the normal gradient distribution information on the closed surface in the preset mapping relationship and the sound field distribution information of the internal sound field of the closed surface is:

[0039] ;

[0040] in, is the sound field distribution of the internal sound field of the closed surface, That is, the internal area enclosed by the closed surface, S is a closed surface, Any point on the closed surface, is the sound field distribution on the closed surface, G is the Green function, n is the normal direction on the closed surface, is the surface normal gradient of the closed surface.

[0041] As an embodiment of the present application, a sound-absorbing structure and / or a vibration structure is further provided at the target object to be imaged.

[0042] The target imaging method based on the neighborhood sound field provided in the embodiment of the present application collects the sound field distribution information of at least one neighborhood sound field of the sound field where the target object is located, and by constructing a closed surface, the neighborhood sound field is regarded as the internal sound field within the closed surface, thereby utilizing the mapping relationship between the closed surface and the internal sound field of the closed surface to construct a mapping relationship between the sound field where the target object is located and at least one neighborhood sound field, thereby realizing the analysis of the target sound pressure distribution information of the sound field where the target object is located, and the target sound pressure distribution information can further realize the acoustic imaging of the target object. That is, the solution provided by the present application can be understood as realizing the acoustic imaging of the target object based on the mapping relationship realized by the mathematical model, bypassing the conventional focusing and beamforming geometric thinking in the related technology, thereby avoiding the fundamental contradiction in principle with the propagation characteristics of the sound wave, which is of great significance for the subsequent improvement of imaging quality and imaging resolution. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 A schematic flow chart of the steps of a target imaging method based on a neighborhood sound field provided in an embodiment of the present application;

[0045] Figure 2 A schematic diagram of the effect of describing the sound field solution process based on Kirchhoff's integral theorem provided in an embodiment of the present application;

[0046] Figure 3 A schematic diagram of the implementation effect of a target imaging method based on a neighborhood sound field provided in an embodiment of the present application;

[0047] Figure 4 This is a schematic diagram of the effect of a target imaging system based on a neighborhood sound field provided by this application;

[0048] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0050] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0051] In the description of this application, the word "for example" is used to mean "used as an example, illustration or illustration". Any embodiment described in this application as "for example" is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any person skilled in the art to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0052] To facilitate understanding of the target imaging method and system based on the neighborhood sound field provided in the embodiments of this application, the application scenarios of the imaging methods of the related technologies are first described. Specifically, the target imaging method based on the neighborhood sound field provided in this application is an acoustic imaging method. Compared with optical imaging, microwave imaging and other methods, due to the clear physical properties of the mechanical vibration of sound waves, the penetration of sound waves in media such as underwater, non-transparent materials, and living tissues is significantly superior, and thus can be applied to target imaging in many non-visual field information acquisition fields.

[0053] However, due to the relatively narrow effective bandwidth of acoustic waves, several orders of magnitude lower than that of light and microwaves, current technologies primarily employ geometric methods to focus the acoustic waves and achieve imaging through point-by-point and line-by-line scanning. However, in practical applications, the poor linear propagation characteristics of sound, coupled with the diffusion effect and the resulting numerous reflections, refractions, and scattering, present significant challenges to focusing methods, primarily in terms of imaging quality and resolution. For example, focusing cannot achieve an infinitesimal beamwidth and must therefore reach a compression limit. This is the theoretical resolution limit of acoustic imaging, which is directly related to the wavelength of the sound and the size of the transmitting / receiving aperture. In theory, smaller wavelengths and larger apertures result in higher resolution. Further improvements to imaging resolution typically require using shorter wavelengths and larger apertures, but this also results in significant engineering complexity and other performance degradations.

[0054] To address the above-mentioned issues, this application provides a target imaging method based on the neighborhood sound field. By utilizing the concept of mathematical model, it bypasses the conventional geometric thinking of focusing and beamforming in related technologies, thereby avoiding the fundamental contradiction between the geometric method and the propagation characteristics of sound waves. This is particularly beneficial for subsequent improvements in imaging quality and imaging resolution. For details, please refer to Figure 1 , Figure 1 A schematic flow chart of a target imaging method based on a neighborhood sound field provided in an embodiment of the present application, specifically comprising steps S110 to S130:

[0055] S110 , collecting sound field distribution information of at least one neighboring sound field of the sound field where the target object is located.

[0056] Unlike conventional technology in which the target object is detected point by point and line by line after being beamed or focused, and imaging is completed by scanning based on the received echo signal, in the embodiment of the present application, a certain sound field distribution is formed near the target object after the transducer transmits sound waves to the area where the target object is located. In particular, the imaging information of the target object can actually be understood as being contained in this sound field distribution information.

[0057] On this basis, in order to realize the collection of sound field distribution information of the sound field where the target object is located, in one embodiment of the present application, the sound field distribution information of at least one neighboring sound field of the sound field where the target object is located will be controlled to be collected. Specifically, the distribution information of the neighboring sound field can be understood as the sound field distribution information in a certain neighborhood that is at a certain interval from the sound wave emitted from the target object area in the sound field formed after the transducer emits sound waves to the area where the target object is located. The sound field distribution information in the neighborhood or the sound field distribution information in these neighborhoods will be used to assist in realizing the calculation of the sound field distribution information of the sound field where the target object is located.

[0058] Specifically, in one embodiment, the sound field distribution information of the neighborhood sound field includes first sound field distribution information of at least one first neighborhood sound field, wherein, in the embodiment of the present application, the provided first neighborhood sound field will be used to implement the mapping relationship in the construction of the sound field. In addition, in some other embodiments of the present application, the sound field distribution information of the neighborhood sound field includes at least second sound field distribution information of a second neighborhood sound field, wherein the second neighborhood sound field is mainly used to form a special closed curve. The specific implementation scheme will be described in detail in subsequent embodiments.

[0059] Furthermore, as an implementation scheme of the present application, the acquisition of the sound field distribution information of at least one neighboring sound field of the sound field where the target object is located can be specifically based on the acousto-optic effect, that is, when the light beam passes through the sound field, it will be offset by a certain angle along the direction of the sound field based on the sound field distribution, thereby obtaining the sound field distribution on the light beam propagation path based on the offset angle of the light beam, and further based on the laser tomography technology, the sound field distribution information in a specific neighboring sound field is calculated by using multiple laser beams with different incident angles. Specifically, that is to say, in one embodiment, the acquisition of the sound field distribution information of at least one neighboring sound field of the sound field where the target object is located includes:

[0060] emitting sound waves toward a target object through a transducer to form a sound field distribution in the vicinity of the target object;

[0061] The sound field distribution information of at least one neighboring sound field of the sound field where the target object is located is collected based on laser beam tomography.

[0062] In an embodiment of the present application, the sound field distribution information of at least one neighboring sound field of the sound field where the target object is located is collected based on laser beam tomography. Specifically, the laser generating device may be driven by a motion mechanism to emit a laser beam, and pass through the sound field at different incident angles or positions, and the integral of the sound field distribution on the optical propagation path is determined based on the deflection information after passing through the sound field. In this way, by performing tomography on the integral of the sound field distribution on the optical propagation path of multiple laser beams, for example, by using an inverse Radon transform, the sound field distribution information at each position can be accurately determined, thereby further determining the sound field distribution information of at least one neighboring sound field.

[0063] Of course, in addition to the solutions provided above, it is also feasible to collect the sound field distribution information of the domain sound field through other methods, and the embodiments of the present application do not limit this.

[0064] S120: Determine an outward-oriented closed curved surface based on a sound field edge of the sound field where the target object is located.

[0065] In the embodiment of the present application, the first neighborhood sound field is located inside the closed curved surface directed outward.

[0066] On the basis of the above-mentioned solution, the present application will construct a mapping relationship between a closed surface and a sound field distribution within the closed surface based on the mathematical model idea of ​​Kirchhoff's integral theorem, so as to realize the solution of a specific closed curve. In particular, in one embodiment of the present application, an outward-oriented closed surface can be determined based on the sound field edge of the sound field where the target object is located. At this time, the first neighborhood sound field is inside the outward-oriented closed surface. In other words, for the closed surface constructed by the present application, the interior of the infinite space outside it, that is, the space containing the first neighborhood sound field, will be regarded as the interior of the closed surface, and the target object (or the space containing the target object) inside it will be regarded as the outside of the closed surface.

[0067] S130 : Determine the sound pressure distribution information of the closed surface based on the first sound field distribution information of the at least one first neighborhood sound field and a preset mapping relationship, so as to determine the target sound pressure distribution information of the sound field where the target object is located.

[0068] In the embodiment of the present application, combined with the above-mentioned relevant description, it can be seen that based on the mathematical model of Kirchhoff's integral theorem, a mapping relationship between a closed surface and a sound field distribution within the closed surface can be constructed. In this process, by treating the first sound field distribution information of at least one first neighborhood sound field as a sound field distribution within the closed surface, and establishing a mapping relationship with the closed surface formed by the closed surface, the sound field distribution information on the closed surface can be solved through this mapping relationship, in particular, including the sound pressure distribution information and the surface normal direction of any point on the closed surface, so as to further determine the target sound pressure distribution information of the sound field where the target object is located in combination with the sound pressure distribution information of the closed surface. Since the target sound pressure distribution information of the sound field where the target object is located describes the various diffusion effects of the target object on the sound wave, such as reflection, scattering, etc., the target sound pressure distribution information can actually be understood as containing the characteristic information of the target object, that is, the acoustic imaging of the target object can be determined based on the target sound pressure distribution information of the sound field where the target object is located. The embodiment of the present application does not elaborate on the basic principles of acoustic imaging.

[0069] Furthermore, in order to clearly understand the mathematical model concept used in the application embodiment, the following will explain the relevant principles of the mapping relationship provided in the application embodiment. Specifically, in one embodiment, the preset mapping relationship generally refers to the mapping relationship between the sound pressure distribution information and normal gradient distribution information on the closed surface and the sound field distribution information of the internal sound field of the closed surface, which can generally be described by Kirchhoff's integral theorem. Specifically, for ease of understanding, please refer to Figure 2 , Figure 2 A schematic diagram of the effect of Kirchhoff's integral theorem solving the sound field by a closed surface wrapping the sound field is provided in an embodiment of the present application, and is described in detail as follows.

[0070] In the embodiment of the present application, the specific calculation formula for the mapping relationship between the sound pressure distribution information and the normal gradient distribution information on the closed surface and the sound field distribution information of the internal sound field of the closed surface in the preset mapping relationship is:

[0071] ;

[0072] in, is the sound field distribution of the internal sound field of the closed surface, That is, the internal area enclosed by the closed surface, that is, the target point, S is a closed surface, is any point on the closed surface, also known as the source point, The source point on the closed surface The sound field distribution, G is the Green function, n is the normal direction of the corresponding source point on the closed surface, is the surface normal gradient of the closed surface. In other words, Kirchhoff's integral theorem gives the sound pressure distribution and normal gradient distribution on a known closed surface. The sound field distribution of each sound field inside the closed surface can be determined by integrating the closed surface, such as surface integral or volume integral. In other words, the sound pressure information of the target surface can be obtained by establishing a wrapping surface around the target and combining it into a new wrapping surface.

[0073] Among them, Green's function is a point source response of a linear differential equation, which is used to solve non-homogeneous partial differential equations. In acoustic problems, the Helmholtz equation is usually involved. In different scenarios, the Green's function often needs to be selected based on the needs of the actual scenario, such as free space or bounded space, and the way to deal with boundary conditions in bounded space. In layman's terms, the Green's function describes the target point r and source point The functional relationship between them. That is, the complete form of Green's function G is G ( r , ), for example, in a possible implementation, the expression of the Green's function G in three-dimensional free space is as follows:

[0074] ;

[0075] Where k is the wave speed.

[0076] For easier understanding, please refer to Figure 2 , Figure 2 A schematic diagram of the effect of describing the sound field solution process based on Kirchhoff's integral theorem provided in an embodiment of the present application.

[0077] Since the sound field usually satisfies the Helmholtz equation in the frequency domain, the sound field distribution is solved by introducing the Green's function, where the Green's function in the three-dimensional free space is as described above. Therefore, this function can describe the spherical waves propagating outward from a point source, that is, the sound field generated by the sound source.

[0078] Since the sound field of an internal point can be regarded as the superposition of the sound field contributions of all points on the closed surface, that is, the Green function acts as a "propagation factor" that can transmit the information of the surface to the internal point, the sound field distribution of any point in the enclosing surface is This can be obtained by considering the distance d between the point and countless infinitesimal elements U on the wrapping surface and integrating the sound field distribution and normal vector n of each infinitesimal element U. The distance d can be considered as the difference between the target point position and the source point position.

[0079] Combining the idea of ​​Kirchhoff's integral theorem provided above, it can be understood that in the closed surface with external orientation constructed above, the first sound field distribution information of the first neighborhood sound field can be regarded as the sound field distribution of the internal sound field of the closed surface, that is, as , thereby using the aforementioned mapping relationship to reversely deduce the sound pressure distribution and normal gradient distribution of the closed surface, that is, the closed surface oriented outward. That is, in this embodiment, based on the second sound field distribution information of the second neighborhood sound field and the preset mapping relationship, determining the sound pressure distribution information of the closed surface includes:

[0080] The second sound field distribution information of the second neighborhood sound field is substituted into the calculation formula as the sound field distribution of the internal sound field of the closed surface for calculation, so as to use the calculated sound field distribution of the closed surface as the sound pressure distribution information of the closed surface.

[0081] Furthermore, since the externally oriented closed surface can be regarded as a wrapping surface established around the target object, the sound pressure distribution and normal gradient distribution based on the externally oriented closed surface can be further used to calculate the surface sound pressure information of the target object inside the wrapping surface after the inversion operation, that is, to calculate the target sound pressure distribution information of the sound field where the target object is located. This sound pressure distribution information can also be regarded as the acoustic imaging of the target object.

[0082] Of course, considering that in the embodiment of the present application, the calculation of the sound pressure distribution information on the closed surface is implemented based on the data model, therefore, there are no requirements for the shape of the neighborhood sound field, such as size, position, and shape. Of course, in order to facilitate subsequent calculations, in one possible implementation scheme, the neighborhood sound field can be selected to have a regular shape. For example, in three-dimensional space, the area of ​​a triangular pyramid can be selected as the neighborhood, and the sound field distribution within this neighborhood can be collected. Since the normal vector of each face of the triangular pyramid is the same, the subsequent calculation amount can be effectively simplified.

[0083] It can be understood that since the above operation depends on the mapping relationship formed between the first sound field distribution information of the first neighborhood sound field and the sound pressure distribution information of the closed surface, or in other words, the sound field distribution information of each point in the first neighborhood sound field can construct a set of mapping relationships, which is used to realize the calculation of the sound pressure distribution information corresponding to a point on the closed surface. In other words, in fact, the resolution of the acoustic imaging of the target object can be regarded as being determined by the number of points with known sound field distribution information in the first neighborhood sound field, that is, the resolution of the neighborhood sound field. Since the points with known sound field distribution information in the first neighborhood sound field can be obtained by interpolation or other methods, this method also gets rid of the resolution of conventional acoustic wave beamforming imaging, which is limited by the wavelength and aperture. In theory, by taking more points with known sound field distribution information in the internal sound field, more mapping relationships with the sound pressure distribution information of the closed surface can be established, thereby effectively improving the resolution of the acoustic imaging of the target object.

[0084] Of course, in theory, based on laser tomography technology combined with the deflection of a sufficient number of laser beams incident at different angles, it is possible to obtain the sound field distribution information of any point in the neighborhood sound field. However, considering that in the actual measurement process, the resolution of each neighborhood sound field may still be affected by external factors and have certain limitations. Therefore, in order to further improve the resolution of the final sound pressure imaging, this application also provides an implementation scheme based on enriching the resolution of the neighborhood sound field in the spatial or temporal dimension to improve the resolution of the sound pressure imaging. The details are as follows.

[0085] For example, in one embodiment of the present application, compared to establishing a mapping relationship between the sound field distribution information of a single first neighborhood sound field and the sound field distribution information of some points on the closed curve, a mapping relationship between the sound field distribution information of multiple first neighborhood sound fields and the sound field distribution information of more points on the closed curve can also be established, thereby calculating the high-resolution sound pressure distribution information of the closed surface, thereby further determining the high-resolution target sound pressure distribution information of the sound field where the target object is located to achieve high-resolution acoustic imaging of the target object. That is, in an embodiment of the present application, determining the sound pressure distribution information of the closed surface based on the first sound field distribution information of the at least one first neighborhood sound field and the preset mapping relationship to determine the target sound pressure distribution information of the sound field where the target object is located includes:

[0086] Based on the first sound field distribution information of at least two first neighborhood sound fields and a preset mapping relationship, the high-resolution sound pressure distribution information of the closed surface is determined to determine the high-resolution target sound pressure distribution information of the sound field where the target object is located, wherein the high-resolution target sound pressure distribution information of the sound field where the target object is located can be used to achieve high-resolution acoustic imaging of the target object.

[0087] In the embodiment of the present application, the collection method of at least two first neighborhood sound fields can also be achieved by relying on the laser beam tomography technology provided above, and the embodiment of the present application will not be repeated here.

[0088] Of course, in addition to achieving high-resolution acoustic imaging of the target object by collecting sound field distribution information of multiple neighboring sound fields in space, in another embodiment, in some specific circumstances, when the target object to be detected is allowed to vibrate, high-resolution acoustic imaging of the target object can also be achieved by collecting sound field distribution change characteristics of sound field distribution information of at least one neighboring sound field caused by the vibration of the target object. That is, in one embodiment, the method further includes:

[0089] Controlling the target object to vibrate so as to collect sound field distribution change characteristics of sound field distribution information of at least one neighboring sound field of the sound field where the target object is located;

[0090] A high-resolution acoustic imaging of the target object is determined based on the sound field distribution change characteristics.

[0091] Among them, after controlling the vibration of the target object, after collecting the sound field distribution information of at least one neighboring sound field of the sound field where the target object is located at multiple moments, the sound field distribution change characteristics caused by the vibration of the target object can be determined based on the sound field distribution information at multiple moments. Specifically, since the sound field distribution change characteristics are caused by the vibration of the target object, in a possible implementation scheme, by analyzing the sound field distribution change characteristics, a high-resolution acoustic imaging of the target object can be restored. For example, in a possible implementation scheme, assuming that the relative displacement of the target object at time A and time B during vibration is x At this time, based on the sound field distribution information collected before and after vibration, the possible sound field distribution information on the closed surface before and after vibration is solved, and the relative position of the target object at time A and time B is introduced. x As a restriction condition for the sound field distribution information on the closed surface before and after vibration, high-resolution acoustic imaging of the target object can be further achieved. Of course, the above description is only one possible implementation scheme. It is also feasible to restore the high-resolution acoustic imaging of the target object from the sound field distribution change characteristics in other ways. For example, in one embodiment, the vibration change of the object and the neighborhood sound field collected before and after the vibration can also be considered to determine the sound field distribution before and after the vibration of the object, thereby combining the vibration change and the change in the direction of the sound wave vector in the sound field distribution to determine the normal plane information on the object, and thus integrate it into the acoustic imaging process. The embodiments of this application will not be described in detail here.

[0092] In addition, as another feasible implementation scheme of the present application, in order to avoid the problem of identity in the process of calculating the sound pressure distribution information of a closed surface, that is, it is impossible to restore the sound pressure distribution information of the closed surface from the sound field distribution information of a neighborhood sound field, in one embodiment of the present application, the sound field distribution information of the neighborhood sound field also includes second sound field distribution information of at least one second neighborhood sound field, wherein the second neighborhood sound field can be used to form a special closed surface with the sound field edge of the sound field where the target object is located. It can be understood that after the introduction of the second neighborhood sound field, the closed surface can be regarded as consisting of the sound field edge of the sound field where the target object is located and the sound field edge of the second neighborhood sound field. In this process, due to the introduction of the second sound field distribution information of the second neighborhood sound field as an indefinite variable, the identity relationship that may appear in the calculation process between a single closed curve and a single neighborhood sound field can be effectively avoided, thereby further improving the acoustic imaging effect of the target object. Specifically, for ease of understanding, in one embodiment, the sound field distribution information of the neighborhood sound field also includes second sound field distribution information of at least one second neighborhood sound field;

[0093] The determining of an outward-oriented closed surface based on the sound field edge of the sound field where the target object is located includes:

[0094] Determining an outwardly oriented closed surface based on a sound field edge of the sound field where the target object is located and a sound field edge of the second neighborhood sound field;

[0095] The determining target sound pressure distribution information of the sound field where the target object is located includes:

[0096] Based on the sound pressure distribution information of the closed surface and the second sound field distribution information of the second neighborhood sound field, target sound pressure distribution information of the sound field where the target object is located is determined.

[0097] In an embodiment of the present application, on the basis of calculating the sound pressure distribution information of the closed surface by constructing a mapping relationship between the first sound field distribution information of the first neighborhood sound field and the closed surface through the scheme provided above, by further removing the second sound field distribution information of the second neighborhood sound field on the sound pressure distribution information of the closed surface, the target sound pressure distribution information of the sound field where the target object is located can be determined, thereby further determining the acoustic imaging of the target object. The embodiments of the present application will not be repeated here.

[0098] The target imaging method based on the neighborhood sound field provided in the embodiment of the present application collects the sound field distribution information of at least one neighborhood sound field of the sound field where the target object is located, and by constructing a closed surface, the neighborhood sound field is regarded as the internal sound field within the closed surface, thereby utilizing the mapping relationship between the closed surface and the internal sound field of the closed surface to construct a mapping relationship between the sound field where the target object is located and at least one neighborhood sound field, thereby realizing the analysis of the target sound pressure distribution information of the sound field where the target object is located, and the target sound pressure distribution information can further realize the acoustic imaging of the target object. That is, the solution provided by the present application can be understood as realizing the acoustic imaging of the target object based on the mapping relationship realized by the mathematical model, bypassing the conventional focusing and beamforming geometric thinking in the related technology, thereby avoiding the fundamental contradiction in principle with the propagation characteristics of the sound wave, and improving the subsequent imaging quality and imaging resolution.

[0099] On the basis of the above-described scheme, in order to further understand the complete scheme provided by the embodiment of the present application, the following will take a first neighborhood sound field and a second neighborhood sound field as an example to describe the specific implementation process of determining the target sound pressure distribution information of the sound field where the target object is located. For details, please refer to Figure 3 .

[0100] like Figure 3 As shown, Figure 3 A schematic diagram of the implementation effect of a target imaging method based on a neighborhood sound field provided in an embodiment of the present application is specifically described in detail as follows.

[0101] In an embodiment of the present application, the sound field where the target object is located is the target neighborhood in the figure, which can be understood as the wrapping surface that wraps the target object. In addition, based on laser tomography technology, the sound field distribution information of multiple neighborhood sound fields can be collected, for example, the neighborhood sound field 1 and the neighborhood sound field 2 shown in the figure, wherein the neighborhood sound field 1 can be regarded as the second neighborhood sound field provided by the present application, that is, used to form a closed surface, and the neighborhood sound field 2 can be regarded as the first neighborhood sound field of the present application, that is, used to construct a mapping relationship between the closed surface and the internal sound field distribution information, so as to achieve the solution of the closed surface. On this basis, it can be seen that the closed surface formed by the neighborhood sound field 1 and the target neighborhood can be regarded as the area with infinite outer radius, that is, R=∞, as the interior of the closed surface. At this time, the outer area of ​​the closed surface is the area including the neighborhood sound field 1 and the target neighborhood.

[0102] On the basis of the above, based on the mapping relationship between the closed surface and the internal sound field distribution information provided by Kirchhoff's integral theorem, by establishing an equation relationship between a closed surface that encloses the target neighborhood, that is, the boundary of the target neighborhood and the internal sound field distribution information, that is, the neighborhood sound field 2, for example, as shown in the figure, multiple image points on the boundary of the target neighborhood can be mapped one by one to multiple points in the neighborhood sound field 2, thereby constructing several equations such as Equation 1, Equation 2, ..., Equation n, etc., so that the sound pressure distribution information of several points on the closed surface that encloses the target neighborhood can be solved according to the sound field distribution of multiple points in the neighborhood sound field 2, thereby further solving the sound pressure distribution information of the sound field where the target object is located, and the sound pressure distribution information can be regarded as the acoustic image of the target object. Among them, the image point is the corresponding point of the object point on the imaging plane in the three-dimensional space under the ideal optical system, which can be understood as multiple points on the closed surface in this application.

[0103] Of course, the closed surface selected above can be any wrapping surface that wraps the target object. For example, it can be a closed surface that is closer to the target. The specific closed surface selected has no effect on the implementation of the solution of this application. The sound pressure distribution information on any closed surface that wraps the target object can be regarded as the acoustic image of the target object included therein. Figure 3 The closed surface shown is only a possible schematic diagram and is not intended to limit the technical solution of this application.

[0104] In order to further verify the effect of the target imaging based on the neighborhood sound field provided by this application, in a feasible implementation scheme, this application also provides a target imaging system based on the neighborhood sound field, which is used to implement the target imaging method based on the neighborhood sound field provided by any of the above embodiments, or the above system can also be used to verify the effect of the technical solution of this application. Figure 4 , Figure 4 This is a schematic diagram of the effect of a target imaging system based on a neighborhood sound field provided by the present application, specifically including a transducer 410 , a rotating laser tomography component 420 and a processor 430 .

[0105] Of course, in some embodiments, the target imaging system based on the neighborhood sound field may further include other devices or structures that assist in acoustic imaging.

[0106] For example, in one embodiment, the target imaging system based on the neighborhood sound field may further include a sound elimination structure for eliminating the sound of the target object to reduce sound wave reflection and improve the sound field measurement effect.

[0107] Alternatively, in another embodiment, the target imaging system based on the neighborhood sound field may further include a vibration structure for controlling the vibration of the target object to achieve high-resolution acoustic imaging.

[0108] Alternatively, in some embodiments, the target imaging system based on the neighborhood sound field may further include a signal source and a power amplifier for controlling and adjusting the power of the transducer.

[0109] In some embodiments, the target imaging system based on the neighborhood sound field may further include some data acquisition modules or pre-processing modules to implement subsequent imaging processing of the target object.

[0110] Of course, in addition to the above solutions, the target imaging system based on the neighborhood sound field can also be configured with other more functional units, which is not limited in the embodiments of the present application.

[0111] Specifically, in one embodiment, the transducer 410 is used to generate sound waves toward the target object to be imaged, so as to form a sound field distribution in the vicinity of the target object.

[0112] The sound field distribution can be used to achieve acoustic imaging of the target object.

[0113] The rotating laser tomography component 420 is used to collect sound field distribution information of at least one neighboring sound field of the sound field where the target object is located through laser beam tomography.

[0114] In the embodiment of the present application, the rotating laser tomography assembly 420 can collect sound field distribution information along multiple beam propagation paths within the sound field by adjusting the angle at which the laser beam is incident on the sound field, thereby determining the sound field distribution of each area within the sound field based on laser tomography technology. In particular, the sound field distribution within a specific sound field neighborhood can be determined, for example, the sound field distribution within the two triangular pyramid areas shown in the figure. Specifically, the sound field distribution information of these neighborhood sound fields includes at least one first neighborhood sound field distribution information.

[0115] In particular, see Figure 4 In one embodiment, the rotational laser tomography assembly 420 includes: a laser generator 421, a photoelectric receiver 422, and a motion mechanism 423, wherein the motion mechanism 423 is used to drive the laser generator 421 and the photoelectric receiver 422 to move on multiple planes;

[0116] The collecting of the sound field distribution information of at least one neighboring sound field of the sound field where the target object is located by laser beam tomography includes:

[0117] collecting deflection information of the laser beam emitted by the laser generating device in at least one adjacent sound field through a photoelectric receiver, wherein the deflection information is used to indicate sound field distribution information of the adjacent sound field;

[0118] The laser generating device and the photoelectric receiver are driven to move on multiple planes by a motion mechanism, so as to determine the sound field distribution information of at least one neighboring sound field based on the deflection information of the laser beam on multiple planes within at least one neighboring sound field collected by the photoelectric receiver.

[0119] The motion mechanism 423 in this embodiment of the present application can perform overall pitch control and horizontal rotation of the laser generator 421 and photoelectric receiver 422. The transducer, controlled by the signal source and power amplifier, repeatedly emits detection sound waves, collaborating with laser beam rotation tomography to collect data in four planes and calculate the neighborhood sound field. Finally, using the calculation process of the neighborhood sound field imaging model, the sound pressure distribution in the neighborhood of the target is calculated to obtain a target image, which is then compared with the actual object to assess the imaging quality.

[0120] The acoustic field distribution information collected by the rotating laser tomography assembly 420 is further input into the processor 430 for calculation.

[0121] Specifically, the processor 430 is configured to determine an outward-oriented closed curved surface based on a sound field edge of the sound field where the target object is located, wherein the first neighborhood sound field is located inside the outward-oriented closed curved surface; and

[0122] Determining the sound pressure distribution information of the closed surface based on the first sound field distribution information of the at least one first neighborhood sound field and a preset mapping relationship, so as to determine the target sound pressure distribution information of the sound field where the target object is located;

[0123] Among them, the preset mapping relationship includes: the mapping relationship between the sound pressure distribution information and normal gradient distribution information on the closed surface and the sound field distribution information of the internal sound field of the closed surface, and the target sound pressure distribution information of the sound field where the target object is located can be used to realize acoustic imaging of the target object.

[0124] Among them, the specific implementation process of determining the sound pressure distribution information of the closed surface based on the first sound field distribution information of at least one first neighborhood sound field and a preset mapping relationship can refer to the aforementioned description of the relevant embodiments of the target imaging method based on the neighborhood sound field, and the embodiments of the present application will not be repeated here.

[0125] For example, in one embodiment, based on the first sound field distribution information of at least one first neighborhood sound field and a preset mapping relationship, determining the sound pressure distribution information of the closed surface can be achieved by a mathematical model based on Kirchhoff's integral theorem, that is, by constructing a mapping relationship between a closed surface and a sound field distribution within the closed surface, thereby solving a specific closed curve. For example, the specific calculation formula for the mapping relationship between the sound pressure distribution information and the normal gradient distribution information on the closed surface and the sound field distribution information of the internal sound field of the closed surface in the preset mapping relationship is:

[0126] ;

[0127] in, is the sound field distribution of the internal sound field of the closed surface, That is, the internal area enclosed by the closed surface, S is a closed surface, Any point on the closed surface, is the sound field distribution on the closed surface, G is the Green function, n is the normal direction on the closed surface, is the surface normal gradient of the closed surface.

[0128] In addition, in another embodiment, the high-resolution sound pressure distribution information of the closed surface may be determined by first sound field distribution information of at least two first neighborhood sound fields and a preset mapping relationship.

[0129] Alternatively, in yet another embodiment, the sound field distribution information of the neighboring sound field further includes second sound field distribution information of at least one second neighboring sound field;

[0130] At this time, the processor is further configured to determine an outward-oriented closed curved surface based on a sound field edge of the sound field where the target object is located and a sound field edge of the second neighborhood sound field;

[0131] Based on the sound pressure distribution information of the closed surface and the second sound field distribution information of the second neighborhood sound field, target sound pressure distribution information of the sound field where the target object is located is determined.

[0132] Alternatively, in yet another embodiment, the processor may be further configured to control the target object to vibrate, so as to collect sound field distribution change characteristics of sound field distribution information of at least one neighboring sound field of the sound field where the target object is located;

[0133] A high-resolution acoustic imaging of the target object is determined based on the sound field distribution change characteristics.

[0134] Of course, the embodiments provided above are only some possible implementation solutions. For the specific implementation process, please refer to the description provided in the above embodiments, and the embodiments of this application will not be repeated here.

[0135] The target imaging system for the neighborhood sound field provided in the embodiments of the present application uses a motion mechanism to perform overall pitch control and horizontal rotation of the laser generator and photoelectric receiver. The transducer is controlled by a signal source and a power amplifier to repeatedly emit detection sound waves. Laser beam rotation tomography is used to complete data collection of sound field distribution information within four planes of the neighborhood sound field to be measured, and the data distribution within the neighborhood sound field is calculated. Finally, the calculation process of the neighborhood sound field imaging model is used to calculate the sound pressure distribution of the target neighborhood, thereby obtaining a target image, which can be compared with the actual object for imaging quality assessment.

[0136] Specifically, the imaging resolution evaluation method is to determine the resolution achievable under a classical imaging model based on the wavelength of the acoustic wave used for imaging and the layout parameters of the imaging device. The specific feature size of the actual imaging of the target imaging system provided by this application is smaller than this value, and the resolution performance is excellent. Therefore, it can be considered that the high-precision sound field obtained by reproducing Kirchhoff's integral theorem has been experimentally verified in imaging applications.

[0137] The target imaging method based on the neighborhood sound field provided in the embodiment of the present application collects the sound field distribution information of at least one neighborhood sound field of the sound field where the target object is located, and by constructing a closed surface, the neighborhood sound field is regarded as the internal sound field within the closed surface, thereby utilizing the mapping relationship between the closed surface and the internal sound field of the closed surface to construct a mapping relationship between the sound field where the target object is located and at least one neighborhood sound field, thereby realizing the analysis of the target sound pressure distribution information of the sound field where the target object is located, and the target sound pressure distribution information can further realize the acoustic imaging of the target object. That is, the solution provided by the present application can be understood as realizing the acoustic imaging of the target object based on the mapping relationship realized by the mathematical model, bypassing the conventional focusing and beamforming geometric thinking in the related technology, thereby avoiding the fundamental contradiction in principle with the propagation characteristics of the sound wave, and improving the subsequent imaging quality and imaging resolution.

[0138] In one embodiment, the present application further provides an electronic device that interacts with a target imaging system based on a neighborhood sound field to achieve imaging of a target object. Taking the electronic device as an example, its internal structure diagram can be as follows: Figure 5 As shown. The electronic device may include: a processor, a memory. The electronic device may also include one or more of a multimedia component, an I / O component, and a communication component. In this embodiment, the electronic device may be a device that implements the target imaging based on the neighborhood sound field provided in this embodiment.

[0139] The processor is used to control the overall operation of the electronic device to complete all or part of the steps in the above-mentioned target imaging method based on the neighborhood sound field. The memory is used to store various types of data to support the operation of the auxiliary electronic device. These data may include, for example, instructions for any application or method operating on the auxiliary electronic device, as well as application-related data, such as contact data, messages sent and received, pictures, audio, video, etc. The memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The multimedia component may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in a memory or transmitted via the communication component. The audio component also includes at least one speaker for outputting audio signals. The I / O component provides an interface between the processor and other interface modules, which may be a keyboard, a mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component is used for wired or wireless communication between the electronic device and other devices, such as super-resolution imaging devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, Narrow Band Internet of Things (NB IOT), Enhanced Machine Type Communication (eMTC), or other 5G technologies, or a combination of one or more thereof, is not limited here. Therefore, the corresponding communication component may include: a Wi-Fi module, a Bluetooth module, an NFC module, etc.

[0140] In an exemplary embodiment, the electronic device may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the target imaging method based on the neighborhood sound field provided in any of the above embodiments, for example:

[0141] Collecting sound field distribution information of at least one neighboring sound field of the sound field where the target object is located; the sound field distribution information of the neighboring sound field includes first sound field distribution information of at least one first neighboring sound field;

[0142] Determining an outward-oriented closed curved surface based on a sound field edge of the sound field where the target object is located, wherein the first neighborhood sound field is located inside the outward-oriented closed curved surface; and

[0143] Determining the sound pressure distribution information of the closed surface based on the first sound field distribution information of the at least one first neighborhood sound field and a preset mapping relationship, so as to determine the target sound pressure distribution information of the sound field where the target object is located;

[0144] Among them, the preset mapping relationship includes: the mapping relationship between the sound pressure distribution information and normal gradient distribution information on the closed surface and the sound field distribution information of the internal sound field of the closed surface, and the target sound pressure distribution information of the sound field where the target object is located can be used to realize acoustic imaging of the target object.

[0145] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided. When executed by a processor, the program instructions implement the steps of the aforementioned target imaging method based on a neighborhood sound field. For example, the computer-readable storage medium may be the aforementioned memory including the program instructions. The program instructions may be executed by a processor of an electronic device to implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of this application.

[0146] Alternatively, when the instructions are executed by a computer, the computer may implement or execute the methods, steps, and logic diagrams disclosed in the embodiments of the present application, for example, executing the following steps:

[0147] Collecting sound field distribution information of at least one neighboring sound field of the sound field where the target object is located; the sound field distribution information of the neighboring sound field includes first sound field distribution information of at least one first neighboring sound field;

[0148] Determining an outward-oriented closed curved surface based on a sound field edge of the sound field where the target object is located, wherein the first neighborhood sound field is located inside the outward-oriented closed curved surface; and

[0149] Determining the sound pressure distribution information of the closed surface based on the first sound field distribution information of the at least one first neighborhood sound field and a preset mapping relationship, so as to determine the target sound pressure distribution information of the sound field where the target object is located;

[0150] Among them, the preset mapping relationship includes: the mapping relationship between the sound pressure distribution information and normal gradient distribution information on the closed surface and the sound field distribution information of the internal sound field of the closed surface, and the target sound pressure distribution information of the sound field where the target object is located can be used to realize acoustic imaging of the target object.

[0151] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0152] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing related hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods.

[0153] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0154] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A target imaging method based on a neighborhood sound field, characterized in that: include: Collecting sound field distribution information of at least one neighboring sound field of the sound field where the target object is located; the sound field distribution information of the neighboring sound field includes first sound field distribution information of at least one first neighboring sound field; Determining an outward-oriented closed curved surface based on a sound field edge of the sound field where the target object is located, wherein the first neighborhood sound field is located inside the outward-oriented closed curved surface; and Determining the sound pressure distribution information of the closed surface based on the first sound field distribution information of the at least one first neighborhood sound field and a preset mapping relationship, so as to determine the target sound pressure distribution information of the sound field where the target object is located; The preset mapping relationship includes: a mapping relationship between sound pressure distribution information and normal gradient distribution information on a closed surface and sound field distribution information of an internal sound field of the closed surface, and the target sound pressure distribution information of the sound field where the target object is located is used to achieve acoustic imaging of the target object; The specific calculation formula for the mapping relationship between the sound pressure distribution information and the normal gradient distribution information on the closed surface in the preset mapping relationship and the sound field distribution information of the internal sound field of the closed surface is: in, is the sound field distribution of the internal sound field of the closed surface, r is the internal area wrapped by the closed surface, S is the closed surface, and s is any point on the closed surface. is the sound field distribution on the closed surface, G is the Green function, n is the normal direction on the closed surface, is the surface normal gradient of the closed surface.

2. The method according to claim 1, characterized in that The determining, based on the first sound field distribution information of the at least one first neighborhood sound field and a preset mapping relationship, the sound pressure distribution information of the closed surface to determine the target sound pressure distribution information of the sound field where the target object is located, includes: Based on the first sound field distribution information of at least two first neighborhood sound fields and a preset mapping relationship, the high-resolution sound pressure distribution information of the closed surface is determined to determine the high-resolution target sound pressure distribution information of the sound field where the target object is located, wherein the high-resolution target sound pressure distribution information of the sound field where the target object is located is used to achieve high-resolution acoustic imaging of the target object.

3. The method according to claim 1, characterized in that The sound field distribution information of the neighborhood sound field further includes second sound field distribution information of at least one second neighborhood sound field; The determining of an outward-oriented closed surface based on the sound field edge of the sound field where the target object is located includes: Determining an outwardly oriented closed surface based on a sound field edge of the sound field where the target object is located and a sound field edge of the second neighborhood sound field; The determining target sound pressure distribution information of the sound field where the target object is located includes: Based on the sound pressure distribution information of the closed surface and the second sound field distribution information of the second neighborhood sound field, target sound pressure distribution information of the sound field where the target object is located is determined.

4. The method according to claim 1, wherein The determining of the sound pressure distribution information of the closed surface based on the first sound field distribution information of the at least one first neighborhood sound field and a preset mapping relationship includes: The first sound field distribution information of the at least one first neighborhood sound field is substituted into the calculation formula as the sound field distribution of the internal sound field of the closed surface for calculation, so as to use the sound field distribution of the closed surface obtained by calculation as the sound pressure distribution information of the closed surface.

5. The method according to claim 1, wherein The collecting of sound field distribution information of at least one neighboring sound field of the sound field where the target object is located includes: emitting sound waves toward a target object through a transducer to form a sound field distribution in the vicinity of the target object; The sound field distribution information of at least one neighboring sound field of the sound field where the target object is located is collected based on laser beam tomography.

6. The method according to any one of claims 1 to 5, characterized in that The method further comprises: Controlling the target object to vibrate so as to collect sound field distribution change characteristics of sound field distribution information of at least one neighboring sound field of the sound field where the target object is located; A high-resolution acoustic imaging of the target object is determined based on the sound field distribution change characteristics.

7. A target imaging system based on a neighborhood sound field, characterized in that: including a transducer, a rotational laser tomography assembly, and a processor; The transducer is used to generate sound waves toward the target object to be imaged, so as to form a sound field distribution in the vicinity of the target object; The rotating laser tomography component is used to collect the sound field distribution information of at least one neighboring sound field of the sound field where the target object is located by laser beam tomography; the sound field distribution information of the neighboring sound field includes the first sound field distribution information of at least one first neighboring sound field The processor is configured to determine an outwardly oriented closed curved surface based on a sound field edge of the sound field where the target object is located, wherein the first neighborhood sound field is located inside the outwardly oriented closed curved surface; and Determining the sound pressure distribution information of the closed surface based on the first sound field distribution information of the at least one first neighborhood sound field and a preset mapping relationship, so as to determine the target sound pressure distribution information of the sound field where the target object is located; The preset mapping relationship includes: a mapping relationship between sound pressure distribution information and normal gradient distribution information on a closed surface and sound field distribution information of an internal sound field of the closed surface, and the target sound pressure distribution information of the sound field where the target object is located is used to achieve acoustic imaging of the target object; The specific calculation formula for the mapping relationship between the sound pressure distribution information and the normal gradient distribution information on the closed surface in the preset mapping relationship and the sound field distribution information of the internal sound field of the closed surface is: in, is the sound field distribution of the internal sound field of the closed surface, r is the internal area wrapped by the closed surface, S is the closed surface, and s is any point on the closed surface. is the sound field distribution on the closed surface, G is the Green function, n is the normal direction on the closed surface, is the surface normal gradient of the closed surface.

8. The system according to claim 7, characterized in that The rotating laser tomography assembly includes: a laser generating device, a photoelectric receiver, and a motion mechanism, wherein the motion mechanism is used to drive the laser generating device and the photoelectric receiver to move on multiple planes; The collecting of sound field distribution information of at least one neighboring sound field of the sound field where the target object is located by laser beam tomography includes: collecting deflection information of the laser beam emitted by the laser generating device in at least one adjacent sound field through a photoelectric receiver, wherein the deflection information is used to indicate sound field distribution information of the adjacent sound field; The laser generating device and the photoelectric receiver are driven to move on multiple planes by a motion mechanism, so as to determine the sound field distribution information of at least one neighboring sound field based on the deflection information of the laser beam on multiple planes within at least one neighboring sound field collected by the photoelectric receiver.

9. The system according to claim 7, wherein: A sound-absorbing structure and / or a vibration structure is also provided at the target object to be imaged.

Images