Three-dimensional sound field measurement and visualization methods, systems, media, devices, and products

Abstract

The application discloses a three-dimensional sound field measurement and visualization method, system, medium, equipment and product, and belongs to the technical field of sound field measurement. The method comprises the following steps: obtaining the equivalent vibration velocity of each layer of a to-be-measured sound field; reconstructing the sound pressure of each layer according to the equivalent vibration velocity of each layer to obtain a sound pressure reconstruction result matrix of each layer; drawing a two-dimensional reconstruction result of each layer of the to-be-measured sound field according to the sound pressure reconstruction result matrix of each layer; filling the sound pressure reconstruction result matrix of each layer into a corresponding page of a constructed three-dimensional zero matrix in sequence of the layers in the to-be-measured sound field to obtain a three-dimensional reconstruction matrix of the to-be-measured sound field; and drawing a three-dimensional reconstruction result of the to-be-measured sound field according to the three-dimensional reconstruction matrix of the to-be-measured sound field. The method can realize three-dimensional reconstruction of a three-dimensional sound field, can obtain the sound pressure distribution of the three-dimensional sound field, and solves the problems that the current sound field reconstruction method cannot realize three-dimensional reconstruction of a sound field and quantitative measurement of sound field intensity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sound field measurement, in particular to a three-dimensional sound field measurement and visualization method, system, medium, equipment and product. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] Non-contact suspension control can be divided into electromagnetic suspension, gas suspension and ultrasonic suspension according to different physical phenomena. Compared with electromagnetic suspension, gas suspension has poor controllability due to the dependence on high-pressure gas flow, and ultrasonic suspension realizes object suspension control by forming a controllable sound field between the acoustic radiator and the suspended object / reflector, which has the advantages of no suspended object property requirement, high field energy density, good controllability and small environmental impact, and is very suitable for high-end semiconductor equipment manufacturing fields such as wafer, semiconductor and the like with high environmental cleanliness, high stability and high integration. In order to realize sound field analysis and efficient control, three-dimensional sound field distribution measurement and reproduction of the suspended resonant cavity are the basis and key of ultrasonic standing wave suspension technology research.

[0004] The current method mainly uses two-dimensional Fourier transform to reconstruct the sound field; however, this method can only realize two-dimensional visualization reconstruction of the sound field of a single horizontal plane, cannot realize reconstruction of the three-dimensional sound field, cannot realize sound field reconstruction of the XZ cross section and the YZ cross section, and cannot obtain the node and loop distribution of the sound field; and the current sound field reconstruction method can only qualitatively describe the distribution form of the sound pressure of the sound field, and cannot realize quantitative measurement of the sound field intensity. SUMMARY

[0005] In order to solve the above problems, the present application provides a three-dimensional sound field measurement and visualization method, system, medium, equipment and product, which can realize three-dimensional reconstruction of the three-dimensional sound field and obtain the sound pressure distribution of the three-dimensional sound field.

[0006] To achieve the above object, the present application adopts the following technical scheme:

[0007] In a first aspect, a three-dimensional sound field measurement and visualization method is provided, comprising:

[0008] The equivalent vibration velocity of each layer of the sound field to be measured is obtained by layer scanning;

[0009] The sound pressure of each layer is reconstructed according to the equivalent vibration velocity of each layer to obtain a sound pressure reconstruction result matrix of each layer;

[0010] A two-dimensional reconstruction result of each layer of the sound field to be measured is obtained according to the sound pressure reconstruction result matrix of each layer;

[0011] The sound pressure reconstruction result matrix of each layer is filled into a corresponding page of a constructed three-dimensional zero matrix in order of layers in the to-be-tested sound field, to obtain a three-dimensional reconstruction matrix of the to-be-tested sound field, wherein the number of pages of the three-dimensional zero matrix is equal to the total number of layers of the to-be-tested sound field; the number of rows and the number of columns of the three-dimensional zero matrix are consistent with the number of rows and the number of columns of the sound pressure reconstruction result matrix;

[0012] According to the three-dimensional reconstruction matrix of the to-be-tested sound field, a three-dimensional reconstruction result of the to-be-tested sound field is drawn.

[0013] Further, the to-be-tested sound field is scanned at equal intervals along the height direction of the to-be-tested sound field.

[0014] Further, according to the three-dimensional reconstruction result of the to-be-tested sound field, a cut chart of the three-dimensional reconstruction result is obtained.

[0015] Further, after the instruction of reconstructing the sound pressure of the set section of the to-be-tested sound field is obtained, the sound pressure data of the set section is extracted from the two-dimensional reconstruction matrix; and according to the sound pressure data of the set section, a two-dimensional reconstruction result of the sound pressure of the set section of the to-be-tested sound field is drawn.

[0016] Further, a maximum value of the sound pressure data of the set section is selected from the extracted sound pressure data, to obtain a maximum value of the sound pressure of the set section of the to-be-tested sound field.

[0017] According to the position of the maximum value of the sound pressure, a position of the maximum sound pressure of the set section is obtained.

[0018] Further, after the sound pressure data of the set section is obtained, adjacent sound pressure data is interpolated to obtain interpolated data, and according to the interpolated data, the two-dimensional reconstruction result of the sound pressure of the set section of the to-be-tested sound field is drawn.

[0019] In a second aspect, a three-dimensional sound field measurement and visualization system is provided, comprising:

[0020] An equivalent vibration velocity obtaining module is configured to obtain the equivalent vibration velocity of each layer of the to-be-tested sound field in a layered scanning manner;

[0021] A sound pressure reconstruction module is configured to reconstruct the sound pressure of each layer according to the equivalent vibration velocity of each layer, to obtain a sound pressure reconstruction result matrix of each layer;

[0022] A two-dimensional reconstruction module is configured to draw a two-dimensional reconstruction result of each layer of the to-be-tested sound field according to the sound pressure reconstruction result matrix of each layer;

[0023] A three-dimensional reconstruction matrix filling module is configured to fill the sound pressure reconstruction result matrix of each layer into the corresponding page of a three-dimensional zero matrix constructed according to the order of layers in the sound field to be measured, so as to obtain a three-dimensional reconstruction matrix of the sound field to be measured, wherein the number of pages of the three-dimensional zero matrix is equal to the total number of layers in the sound field to be measured, and the number of rows and the number of columns of the three-dimensional zero matrix are consistent with the number of rows and the number of columns of the sound pressure reconstruction result matrix;

[0024] A three-dimensional reconstruction module is configured to draw a three-dimensional reconstruction result of the sound field to be measured according to the three-dimensional reconstruction matrix of the sound field to be measured.

[0025] In a third aspect, a computer device is provided, and the device comprises:

[0026] A processor is adapted to execute a computer program;

[0027] A computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the three-dimensional sound field measurement and visualization method provided in the first aspect.

[0028] In a fourth aspect, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program, and the computer program is adapted to be loaded and executed by a processor to implement the three-dimensional sound field measurement and visualization method provided in the first aspect.

[0029] In a fifth aspect, a computer program product is provided, and the computer program product comprises a computer program, and the computer program is executed by a processor to implement the three-dimensional sound field measurement and visualization method provided in the first aspect.

[0030] Compared with the prior art, the present application has the following beneficial effects:

[0031] The three-dimensional sound field measurement and visualization method, system, medium, device and product provided by the present application obtain the equivalent vibration velocity of each layer in the sound field to be measured in a layered scanning manner, reconstruct the sound pressure of each layer according to the equivalent vibration velocity of each layer, and obtain the sound pressure reconstruction result matrix of each layer. Then, the sound pressure reconstruction result matrix of each layer is filled into the corresponding page of a three-dimensional zero matrix constructed according to the order of layers in the sound field to be measured, so as to obtain a three-dimensional reconstruction matrix of the sound field to be measured. Finally, the three-dimensional visualization of the entire ultrasonic levitation sound field is realized, and the distribution of the three-dimensional sound field and the internal sound pressure can be clearly displayed.

[0032] The advantages of the additional aspects of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Embodiments of the application, illustrated and described herein, are not meant to be an improper limitation on the overall scope of the application.

[0034] Figure 1 Flow chart of the method for measuring and visualizing three-dimensional acoustic field according to the embodiment;

[0035] Figure 2 Schematic diagram of the main structure of the system for measuring and visualizing three-dimensional acoustic field according to the embodiment;

[0036] Figure 3 Schematic diagram of the main structure of the system for measuring and visualizing three-dimensional acoustic field according to the embodiment;

[0037] Figure 4 Visualized result according to the embodiment.

[0038] Wherein, 1, scanning laser Doppler vibrometer; 2, light-reflecting plate; 3, ultrasonic transducer; 4, reflector; 5, standing wave acoustic field. DETAILED DESCRIPTION

[0039] The application will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] It should be noted that the following detailed description is illustrative only, and is intended to provide further description in order to provide a further understanding of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0041] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that, as used in this specification and the appended claims, the singular form "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should also be noted that, as used in this specification and the appended claims, the term "or" as used in the "at least one of A and / or B" includes all possible combinations of A and B.

[0042] Embodiment 1

[0043] Non-contact levitation manipulation can be divided into electromagnetic levitation, gas levitation and ultrasonic levitation according to different physical phenomena. Compared with electromagnetic levitation, gas levitation has poor controllability due to its dependence on high-pressure gas flow, and ultrasonic levitation can achieve object levitation and manipulation by forming a controllable acoustic field between the acoustic radiator and the levitated object / reflector, which has the advantages of no object property requirement, high field energy density, good controllability and small environmental impact, and is very suitable for the field of high-end semiconductor equipment manufacturing such as wafer, semiconductor, etc. with high cleanliness, high stability and high integration. In order to realize the analysis and efficient control of the acoustic field, the three-dimensional acoustic field distribution measurement and reproduction of the levitation resonant cavity are the basis and key of the ultrasonic standing wave levitation technology research. At present, the methods for measuring acoustic pressure distribution mainly include microphone measurement method and laser vibration meter measurement method. The traditional microphone measurement method receives the sound wave signal in the sound field through the microphone, and processes the sound wave signal by filtering, amplifying, etc. to remove noise and interference, converts it into an electric signal for measurement and analysis, so as to understand the characteristics of the sound field. Due to the characteristics of small gap of levitation actuation and easy disturbance of sound field distribution, it is difficult to realize effective sound field measurement by the microphone measurement method. In addition, the microphone measurement method is easily affected by environmental noise, temperature, humidity, etc., and the arrangement of measurement elements in the field will also seriously interfere with the original sound field. Laser Doppler vibration meter is a motion measurement instrument that measures the speed of an object by using the change of laser frequency. It is widely used in non-contact sound field vibration measurement due to its non-invasive system, high measurement precision / sensitivity and strong stability. Based on the principle of acousto-optic effect, sound pressure will change the refractive index of air in the region and affect the optical path of laser. The change of optical path can be equivalent to the vibration of the reflecting plate, and finally the equivalent vibration speed of the reflecting plate can be obtained by the laser vibration meter. Therefore, how to inversely analyze the equivalent vibration speed and indirectly measure the sound field distribution has become a key technology and core problem of non-contact sound field measurement.

[0044] In order to meet the needs of measuring different types of sound field with laser vibrometer, people have studied different types of sound field reconstruction methods. Such as a Hankel-Fourier (HF) algorithm suitable for axisymmetric sound field reconstruction. It uses the mathematical principle that the original function can be obtained by Abelian transform of the dual function, then Fourier transform, and finally inverse Hankel transform. The sound pressure in the axisymmetric sound field is subjected to Abelian transform, and the result is found to be the line integral of the sound pressure along the laser path, which is the equivalent vibration velocity measured by the laser vibrometer. Therefore, according to the principle, the equivalent vibration velocity is divided by the corresponding coefficient, and then the Fourier transform and inverse Hankel transform are performed in turn, and the discrete operation is performed at the same time, and the expression of the original function sound pressure in the discrete case is obtained. Finally, the algorithm is established according to the expression, and the reconstruction of the axisymmetric sound field is realized. The sound pressure curve obtained by reconstruction is compared with the sound pressure curve obtained by simulation of multi-physical field simulation software, and it is found that the two curves are in good agreement in shape. But this method can only be used for the reconstruction of axisymmetric sound field, which limits its application scenarios. In the paper "Identification of asymmetric ultrasonic standing wave sound field based on laser vibrometer", the filtered back projection (FBP) algorithm is applied to the reconstruction of sound field. It not only can reconstruct the axisymmetric sound field, but also can realize the reconstruction of non-axisymmetric sound field. The mathematical principle of FBP algorithm is the Fourier central slice theorem: one-dimensional Fourier transform of the projection of the image is equivalent to two-dimensional Fourier transform of the original image. In this paper, 180 groups of equivalent vibration velocities at different angles from 0 degrees to 179 degrees are measured, which is the line integral of sound pressure along the laser path, that is, the 180 projections of the sound pressure field. Then the one-dimensional Fourier transform of each projection is solved, and the results of one-dimensional Fourier transform are collected into the two-dimensional Fourier transform results of the sound pressure field. Finally, the original sound field is reconstructed by using the inverse Fourier transform. At the same time, in order to make the final reconstruction result smoother, Hamming window function is selected to process it. The reconstructed sound field is compared with the sound field obtained by simulation of multi-physical field simulation software, and the two are similar in overall structure, realizing the reconstruction of sound pressure distribution. Since this method has no restrictions on the type of measured sound field, it can be applied to more scenarios.

[0045] At present, the research on sound field reconstruction method has achieved certain results, however, in the aspect of visualizing the reconstructed sound field, the work done at present is limited to realizing the two-dimensional visualization of the sound field in a single horizontal plane, while the actual ultrasonic levitation sound field is a three-dimensional complex sound field in the shape of cylinder or cuboid, and only the two-dimensional visualization of the sound field distribution in a fixed height plane is realized, which is limited compared with realizing the three-dimensional visualization of the sound field. Meanwhile, the nodes and antinodes of the ultrasonic levitation sound field are distributed in the axial direction of the radiator and reflector, taking the axial direction as the Z-axis direction, and at present, only the visualization of the sound field in a single horizontal plane, i.e. the XY cross section, can be realized, but the distribution of the nodes and antinodes of the sound field can only be shown through the vertical cross sections such as the XZ cross section and the YZ cross section, so that at present, there is a lack of method for realizing the reconstruction and visualization of the vertical plane. In addition, the existing sound field reconstruction research only realizes the qualitative description of the distribution mode of the sound pressure, and cannot realize the quantitative measurement of the sound field intensity, and the integrated reproduction and visualization method for the reconstructed sound field is also missing, which seriously restricts the development of ultrasonic levitation technology.

[0046] To solve the above technical problems, in this embodiment, a three-dimensional sound field measurement and visualization method is disclosed, which is applied to a system as shown in Figure 2 and Figure 3 The system comprises a scanning laser vibration meter 1, a reflecting plate 2, an ultrasonic transducer 3 and a reflector 4, the ultrasonic transducer 3 emits ultrasonic waves, the ultrasonic waves form a cylindrical standing wave sound field 5 between the ultrasonic transducer 3 and the reflector 4, the scanning laser vibration meter 1 emits laser to the standing wave sound field 5, the laser is reflected by the reflecting plate 2 after reaching the reflecting plate 2, the reflected light passes through the standing wave sound field 5 and returns to the scanning laser vibration meter 1, and the scanning laser vibration meter 1 analyzes to obtain the equivalent vibration velocity after receiving the reflected light.

[0047] In this embodiment, the to-be-measured sound field is equally spaced layered in the height direction, and the scanning laser vibration meter 1 is used to scan the to-be-measured sound field layer by layer to obtain the equivalent vibration velocity of each layer of the to-be-measured sound field. The principle of using the equivalent vibration velocity to reconstruct the sound field is the acousto-optic effect, i.e. the equivalent vibration velocity and the sound pressure have the following relationship:

[0048]

[0049] In the formula, v LDV is the equivalent vibration velocity, f is the ultrasonic frequency, c is the sound speed, p is the air density, n is the air refractive index, L is the laser path from the laser vibration meter to the reflecting plate, and P is the sound pressure.

[0050] Next, the three-dimensional sound field measurement and visualization method disclosed in this embodiment will be described in detail.

[0051] The three-dimensional sound field measurement and visualization method disclosed in this embodiment is applied to a system as shown inFigure 1 The method comprises the following steps:

[0052] The equivalent vibration velocity of each layer of the sound field to be measured is obtained by layer scanning.

[0053] The sound pressure of each layer is reconstructed according to the equivalent vibration velocity of each layer, and a sound pressure reconstruction result matrix of each layer is obtained.

[0054] A two-dimensional reconstruction result of each layer of the sound field to be measured is drawn according to the sound pressure reconstruction result matrix of each layer.

[0055] The sound pressure reconstruction result matrix of each layer is filled into the corresponding page of the constructed three-dimensional zero matrix in the order of the layers in the sound field to be measured, and a three-dimensional reconstruction matrix of the sound field to be measured is obtained, wherein the number of pages of the three-dimensional zero matrix is equal to the total number of layers of the sound field to be measured; the number of rows and the number of columns of the three-dimensional zero matrix are consistent with the number of rows and the number of columns of the sound pressure reconstruction result matrix.

[0056] A three-dimensional reconstruction result of the sound field to be measured is drawn according to the three-dimensional reconstruction matrix of the sound field to be measured.

[0057] The sound field to be measured is scanned at equal intervals in the height direction of the sound field to be measured.

[0058] The sound field to be measured is an ultrasonic levitation sound field, and the sound field to be measured is divided into as many layers as possible to obtain a more detailed and accurate three-dimensional reconstruction result of the sound field to be measured.

[0059] Then, a plurality of sets of equivalent vibration velocity data of each layer of the sound field to be measured are measured by a scanning laser vibration meter by using a filtered reflection projection measurement method, and the equivalent vibration velocity data of each layer are sorted to obtain an equivalent vibration velocity matrix of each layer, wherein the rows of the equivalent vibration velocity matrix represent 180 angles between 0 degrees and 179 degrees, and the columns represent the equivalent vibrations of the scanning points corresponding to the measurement of the angle of the layer.

[0060] Preferably, the X direction, the Y direction and the Z direction are perpendicular to each other, and the X direction and the Y direction are horizontal directions.

[0061] 180 sets of equivalent vibration velocity data are obtained for each layer.

[0062] After obtaining the equivalent vibration velocity matrix of each layer of the sound field to be measured, the embodiment enters the two-dimensional and three-dimensional visualization stage of the sound field to be measured. Before measuring the sound field to be measured, a three-dimensional zero matrix containing multiple pages is constructed according to the number of layers, the number of rows of each layer and the number of columns of each layer of the sound field to be measured. The number of pages of the three-dimensional zero matrix is the same as the total number of layers of the sound field to be measured. The number of rows of each page of the three-dimensional zero matrix is equal to the number of rows of the sound pressure reconstruction result matrix, and the number of columns of each page is equal to the number of columns of the sound pressure reconstruction result matrix. That is, the number of rows and the number of columns of each page of the three-dimensional zero matrix are equal to the number of rows and the number of columns of the sound pressure reconstruction result matrix of the corresponding layer of the sound field to be measured.

[0063] According to the order from the lowest layer to the highest layer, the embodiment processes the equivalent vibration velocity matrix of each layer obtained previously by using the filtered back-projection reconstruction method, realizes the reconstruction of the sound pressure of each layer, and obtains the sound pressure reconstruction result matrix of each layer.

[0064] The calculation equation of the filtered back-projection reconstruction method is:

[0065] Q θi (n*l) = l x IFFT(FFT(v / η) x FFT(h x WHM))

[0066]

[0067] Wherein, N represents the total number of angle values, which is 180 in the embodiment, i takes a value between 1 and N, θ i represents the corresponding angle of the current laser point in the equivalent vibration velocity matrix; l represents the actual distance between two points in the reconstruction result matrix, n represents the distance number of the point from the starting point of measurement, (n*l) represents the corresponding horizontal position of the current laser point in the equivalent vibration velocity matrix; θ i and (n*l) determine the position of the laser point in the equivalent vibration velocity matrix of the current layer, Q θi (n*l) represents the projection value at the θ i angle and (n*l) horizontal position after filtering operation; v represents the equivalent vibration velocity, η represents the corresponding coefficient in the acousto-optic effect, FFT represents the Fourier transform, IFFT represents the inverse Fourier transform, (h*WHM) represents the product of the filter function and the Hamming window function; p represents the sound pressure reconstruction result obtained after the back-projection operation, x represents the number of rows in the two-dimensional reconstruction result matrix, and y represents the number of columns in the two-dimensional reconstruction result matrix.

[0068] According to the obtained sound pressure reconstruction result matrix of each layer, a sound pressure two-dimensional reconstruction result of the layer can be plotted, and the two-dimensional visualization of the sound pressure of the layer is realized. Meanwhile, the obtained sound pressure two-dimensional reconstruction result matrix needs to be assigned to the corresponding page of the previously established three-dimensional zero matrix. In this way, after the equivalent vibration velocity matrix of all layers is processed, the three-dimensional zero matrix can be filled with the sound pressure two-dimensional reconstruction result matrix of each layer in the same order as the real situation, and a three-dimensional reconstruction matrix is obtained. According to the three-dimensional reconstruction matrix, a three-dimensional reconstruction result of the sound field to be measured as shown in Figure 4

[0069] The embodiment can also obtain a cutout diagram of the three-dimensional reconstruction result according to the three-dimensional reconstruction result of the sound field to be measured.

[0070] As shown in Figure 4 , the three-dimensional reconstruction result of the sound field to be measured is processed by modifying the transparency, a cutout diagram of the three-dimensional reconstruction result is obtained, and finally the three-dimensional visualization of the entire sound field to be measured is realized, which can clearly show the distribution of the three-dimensional sound field and the internal sound pressure.

[0071] After obtaining the instruction of reconstructing the sound pressure of the set section of the sound field to be measured, the embodiment extracts the sound pressure data of the set section from the two-dimensional reconstruction matrix; according to the sound pressure data of the set section, a sound pressure two-dimensional reconstruction result of the set section of the sound field to be measured is obtained, and the visualization of the sound pressure of the set section is realized.

[0072] The embodiment also selects the maximum value from the extracted sound pressure data of the set section, and obtains the maximum sound pressure of the set section of the sound field to be measured; according to the position of the maximum sound pressure.

[0073] In order to improve the accuracy of the visualization of the sound pressure of the set section, the embodiment performs interpolation on the adjacent sound pressure data after obtaining the sound pressure data of the set section, and obtains interpolated data; according to the interpolated data, a sound pressure two-dimensional reconstruction result of the set section of the sound field to be measured is obtained.

[0074] The set section proposed in the embodiment can be an XZ section, a YZ section and an XY section. In order to realize the visualization of the sound pressure of the set section of the sound field to be measured, an XZ section two-dimensional zero matrix and a YZ section two-dimensional zero matrix are set, wherein the number of rows of the XZ section two-dimensional zero matrix is equal to the total number of layers of the sound field to be measured, and the number of columns of the XZ section two-dimensional zero matrix is equal to the number of columns of the three-dimensional reconstruction result; the number of rows of the YZ section two-dimensional zero matrix is equal to the total number of layers of the sound field to be measured, and the number of columns of the YZ section two-dimensional zero matrix is equal to the number of rows of the three-dimensional reconstruction result.

[0075] ​When the section is set to the Yth XZ section, all the data in the Yth row of each page of the three-dimensional reconstruction matrix are extracted, and all the extracted data in the Yth row are assigned to the corresponding rows of the constructed XZ section two-dimensional zero matrix, filling this two-dimensional zero matrix to obtain the XZ section two-dimensional reconstruction matrix; then, since the total number of layers of the sound field to be measured is small compared with the number of rows and columns of the reconstruction result matrix, in order to make the visualization results in the height direction more detailed, linear interpolation is performed between every two rows of data in the XZ section two-dimensional reconstruction matrix to obtain the XZ section interpolation matrix; according to the XZ section interpolation matrix, the two-dimensional reconstruction result of the sound pressure of the Yth XZ section of the sound field to be measured is drawn to realize the visualization of the Yth XZ section.

[0076] Among them, the Yth XZ section can be determined by the Y coordinate.

[0077] When the section is set to the Xth YZ section, all the data in the Xth column of each page of the three-dimensional reconstruction matrix are extracted, and all the extracted data in the Xth column are assigned to the corresponding rows of the constructed YZ section two-dimensional zero matrix, filling this two-dimensional zero matrix to obtain the YZ section two-dimensional reconstruction matrix; then, linear interpolation is performed between every two rows of data in the YZ section two-dimensional reconstruction matrix to obtain the YZ section interpolation matrix; based on the YZ section interpolation matrix, the two-dimensional reconstruction result of the sound pressure of the Xth YZ section of the sound field to be measured is plotted to achieve visualization of the Xth YZ section.

[0078] The Xth YZ section can be determined by the X coordinate.

[0079] When the cross section is set to the Zth layer's XY cross section, the 2D reconstruction of the sound pressure at that cross section is identical to the 2D reconstruction of the sound pressure at the Zth layer drawn during the 2D visualization phase, eliminating the need for linear interpolation. After obtaining the Z coordinates of the XY cross section you want to visualize, you first set the plot to only plot the data on page Z. Then, plotting is performed based on the 3D reconstruction matrix to obtain the 2D reconstruction of the sound pressure at the Zth layer's XY cross section, achieving XY cross section visualization.

[0080] The XY cross section of the Zth layer can be determined by the Z coordinate.

[0081] After the visualization of the XZ section, YZ section and XY section is realized in this embodiment, the maximum sound pressure of each of the three sections and the coordinate position of the maximum value can be obtained by reading the maximum value in the matrix corresponding to the three sections and the row and column values ​​where the maximum value is located, thereby realizing quantitative analysis of the sound field intensity.

[0082] The two-dimensional reconstruction results of the sound pressure of each layer of the sound field to be measured, the three-dimensional reconstruction results of the sound field to be measured, and the two-dimensional reconstruction results of the sound pressure of three set cross sections are finally obtained in this embodiment, such as Figure 4As shown, quantitative analysis of the measured sound field intensity is realized, and the entire visualization interface establishes an integrated reproduction and visualization method, simplifies the operation steps of the researchers, and reduces the time for the researchers to obtain the target information.

[0083] The three-dimensional sound field measurement and visualization method disclosed in the embodiment can obtain three-dimensional reconstruction results and three-dimensional slice maps of a three-dimensional complex sound field, realizes three-dimensional visualization of the sound field, and enables researchers to intuitively observe the distribution of the three-dimensional sound field and internal sound pressure.

[0084] On the basis of three-dimensional visualization, the embodiment can not only realize visualization of a single horizontal plane, that is, XY cross-section reconstruction of the sound field, but also realize visualization of vertical cross sections such as XZ cross sections and YZ cross sections, and can help researchers to obtain the distribution of sound field nodes and antinodes.

[0085] The embodiment can directly display the maximum sound pressure and its coordinates in the corresponding cross section while obtaining the three-dimensional cross-section sound field visualization results, realizes quantitative analysis of the sound field intensity, and establishes an integrated reproduction and visualization method as a whole, simplifies the operation steps of the researchers, and reduces the time for the researchers to obtain the target information.

[0086] Embodiment 2

[0087] In this embodiment, a three-dimensional sound field measurement and visualization system is disclosed, comprising:

[0088] An equivalent vibration velocity acquisition module is configured to obtain the equivalent vibration velocity of each layer of the measured sound field in a layered scanning manner;

[0089] A sound pressure reconstruction module is configured to reconstruct the sound pressure of each layer according to the equivalent vibration velocity of each layer, and obtain a sound pressure reconstruction result matrix of each layer;

[0090] A two-dimensional reconstruction module is configured to draw a two-dimensional reconstruction result of each layer of the measured sound field according to the sound pressure reconstruction result matrix of each layer;

[0091] A three-dimensional reconstruction matrix filling module is configured to fill the sound pressure reconstruction result matrix of each layer into the corresponding page of a constructed three-dimensional zero matrix in the order of the layers of the measured sound field, and obtain a three-dimensional reconstruction matrix of the measured sound field, wherein the number of pages of the three-dimensional zero matrix is equal to the total number of layers of the measured sound field; the number of rows and the number of columns of the three-dimensional zero matrix are consistent with the number of rows and the number of columns of the sound pressure reconstruction result matrix;

[0092] A three-dimensional reconstruction module is configured to draw a three-dimensional reconstruction result of the measured sound field according to the three-dimensional reconstruction matrix of the measured sound field.

[0093] The application further discloses a computer device, which comprises:

[0094] a processor adapted to execute the computer program;

[0095] a computer readable storage medium having stored therein a computer program, the computer program being executed by the processor to implement the three-dimensional sound field measurement and visualization method disclosed in Embodiment 1.

[0096] The application further discloses a computer readable storage medium having stored therein a computer program, the computer program being adapted to be loaded and executed by a processor to implement the three-dimensional sound field measurement and visualization method disclosed in Embodiment 1.

[0097] The application further discloses a computer program product comprising a computer program, the computer program being executed by a processor to implement the three-dimensional sound field measurement and visualization method disclosed in Embodiment 1.

[0098] The method disclosed in Embodiment 1 can be directly embodied as hardware processor execution, or be executed by a combination of hardware and software modules in the processor. The software module can be located in a storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, a register, or the like. The storage medium is located in the memory, and the processor reads information in the memory and combines the hardware to complete the steps of the above method. To avoid repetition, no further description is given here.

[0099] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the application.

[0100] The above describes the specific embodiments of the application in combination with the accompanying drawings, but is not a limitation on the protection scope of the application. Those skilled in the art should understand that various modifications or variations made by those skilled in the art on the basis of the technical solutions of the application without inventive labor are still within the protection scope of the application.

Claims

1. A method for three-dimensional sound field measurement and visualization, characterized by, The application comprises the following steps: The scanning laser vibration meter is used to emit laser to the standing wave sound field, and the laser is reflected by the reflecting plate after reaching the reflecting plate. The reflected light passes through the standing wave sound field and returns to the scanning laser vibration meter again. The scanning laser vibration meter analyzes the equivalent vibration velocity after receiving the reflected light. The sound field to be measured is equally spaced in the height direction. The scanning laser vibration meter is used to scan the sound field to be measured layer by layer, and the equivalent vibration velocity of each layer of the sound field to be measured is obtained. The equivalent vibration velocity of each layer obtained through the foregoing step is processed by using the filtered back-projection reconstruction method, so that the sound pressure of each layer is reconstructed, and the sound pressure reconstruction result matrix of each layer is obtained. According to the sound pressure reconstruction result matrix of each layer, the two-dimensional reconstruction result of each layer of the sound field to be measured is obtained. The sound pressure reconstruction result matrix of each layer is filled into the corresponding page of the three-dimensional zero matrix constructed according to the order of the layers in the sound field to be measured, and the three-dimensional reconstruction matrix of the sound field to be measured is obtained. The number of pages of the three-dimensional zero matrix is equal to the total number of layers of the sound field to be measured. The number of rows and the number of columns of the three-dimensional zero matrix are consistent with the number of rows and the number of columns of the sound pressure reconstruction result matrix. According to the three-dimensional reconstruction matrix of the sound field to be measured, the three-dimensional reconstruction result of the sound field to be measured is obtained.

2. The method of three-dimensional acoustic field mapping and visualization of claim 1, wherein, According to the three-dimensional reconstruction result of the sound field to be measured, the cutout diagram of the three-dimensional reconstruction result is obtained.

3. The method of three-dimensional acoustic field mapping and visualization of claim 1, wherein, After obtaining the instruction of reconstructing the sound pressure of the set section of the sound field to be measured, the sound pressure data of the set section is extracted from the two-dimensional reconstruction matrix. According to the sound pressure data of the set section, the two-dimensional reconstruction result of the sound pressure of the set section of the sound field to be measured is obtained.

4. The method of three-dimensional sound field mapping and visualization of claim 3, wherein, The maximum value of the sound pressure of the set section of the sound field to be measured is obtained by selecting the maximum value from the extracted sound pressure data of the set section. According to the position of the maximum value of the sound pressure, the position of the maximum sound pressure of the set section is obtained.

5. The method of three-dimensional acoustic field mapping and visualization of claim 3, wherein, After obtaining the sound pressure data of the set section, the adjacent sound pressure data is interpolated to obtain the interpolated data. According to the interpolated data, the two-dimensional reconstruction result of the sound pressure of the set section of the sound field to be measured is obtained.

6. A three-dimensional sound field measurement and visualization system, characterized by The application comprises the following steps: The equivalent vibration velocity acquisition module is used to emit laser to the standing wave sound field by using the scanning laser vibration meter. The laser is reflected by the reflecting plate after reaching the reflecting plate. The reflected light passes through the standing wave sound field and returns to the scanning laser vibration meter again. The scanning laser vibration meter analyzes the equivalent vibration velocity after receiving the reflected light. The sound field to be measured is equally spaced in the height direction. The scanning laser vibration meter is used to scan the sound field to be measured layer by layer, and the equivalent vibration velocity of each layer of the sound field to be measured is obtained. The sound pressure reconstruction module is used to process the equivalent vibration velocity of each layer obtained through the foregoing step by using the filtered back-projection reconstruction method, so that the sound pressure of each layer is reconstructed, and the sound pressure reconstruction result matrix of each layer is obtained. The two-dimensional reconstruction module is used to obtain the two-dimensional reconstruction result of each layer of the sound field to be measured according to the sound pressure reconstruction result matrix of each layer. The three-dimensional reconstruction matrix filling module is configured to fill the sound pressure reconstruction result matrix of each layer into the corresponding page of a three-dimensional zero matrix constructed according to the order of the layers in the sound field to be measured, so as to obtain a three-dimensional reconstruction matrix of the sound field to be measured, wherein the number of pages of the three-dimensional zero matrix is equal to the total number of layers of the sound field to be measured; the number of rows and the number of columns of the three-dimensional zero matrix are consistent with the number of rows and the number of columns of the sound pressure reconstruction result matrix; The three-dimensional reconstruction module is configured to draw a three-dimensional reconstruction result of the sound field to be measured according to the three-dimensional reconstruction matrix of the sound field to be measured.

7. An electronic device, comprising: The device comprises: a processor adapted to execute a computer program; a computer readable storage medium having stored therein a computer program, the computer program being executed by the processor to implement the three-dimensional sound field measurement and visualization method of any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is adapted to be loaded and executed by the processor to implement the three-dimensional sound field measurement and visualization method of any one of claims 1-5.

9. A computer program product, characterised in that, The computer program product comprises a computer program, and the computer program is executed by the processor to implement the three-dimensional sound field measurement and visualization method of any one of claims 1-5.

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