CN108760899B - Ultrasonic transducer model manufacturing method and device - Google Patents
Ultrasonic transducer model manufacturing method and device Download PDFInfo
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Abstract
The application discloses a method and a device for manufacturing an ultrasonic transducer model, wherein a model is built for a target body to be detected, effective detection sound field distribution of the target body model is obtained, a projection of an ultrasonic transducer on a xoy plane of a space rectangular coordinate system and a z coordinate value corresponding to the projection are respectively obtained through a detection parameter and a preset formula, so that the ultrasonic transducer model can be built through three-dimensional software, then the ultrasonic transducer is manufactured according to the ultrasonic transducer model, sound fields of the ultrasonic transducer model built according to the projection and the z coordinate value are both sound fields valuable to the target body, the sound fields with low value or without value are reduced, the detection sensitivity of the ultrasonic transducer is improved, the occurrence of a detection blind zone is avoided, the problems that the ultrasonic transducer obtained by the existing method for manufacturing the ultrasonic transducer model is easy to have the detection blind zone and the sensitivity is low in the content of a region to be detected are solved, leading to the technical problem of poor ultrasonic detection effect.
Description
Technical Field
The application relates to the technical field of ultrasonic detection, in particular to an ultrasonic transducer model manufacturing method and device.
Background
With the rapid development of science and technology, the application of ultrasonic waves in sensors is more and more extensive, and ultrasonic transducers used as ultrasonic detection core devices are favored in various industries.
In practical application, the current ultrasonic transducer design does not have a unified design standard, so that the ultrasonic transducer obtained by the current ultrasonic transducer manufacturing method has many trial and error opportunities and uneven detection performance, and when the ultrasonic transducer is used for detecting a complex structure, for example: the hidden parts in the aircraft engine, the worm wheel in the nuclear power station, the worm structure, certain tissue organs in the human body and the like easily cause the problems of poor ultrasonic detection effect due to low detection blind area and sensitivity.
Disclosure of Invention
The embodiment of the application provides an ultrasonic transducer model making method and device, and is used for solving the technical problems that an ultrasonic transducer obtained by the existing ultrasonic transducer model making method is easy to have a detection blind area and low sensitivity in a region to be detected, and the ultrasonic detection effect is poor.
The present application provides in a first aspect an ultrasound transducer modeling method, including:
acquiring a detection sound field of a target body model according to the target body model to be subjected to ultrasonic detection;
determining detection parameters of the ultrasonic transducer according to the detection sound field, and calculating the working frequency of an ultrasonic transducer model to be established according to the detection parameters, wherein the detection parameters comprise: speed of sound, resolution, and half spread angle;
calculating the wave source initial sound pressure of the ultrasonic transducer model to be established according to the working frequency and a first preset sound pressure calculation formula, dividing grids for the detection sound field through finite element software, and calculating the sound pressure value of each grid according to a preset sound field attenuation formula;
calculating the projection of the ultrasonic transducer model to be established on the xoy plane of the established ultrasonic transducer space rectangular coordinate system according to the half diffusion angle and the detection sound field, and meshing the projection by the finite element software;
and calculating a z-coordinate value corresponding to each grid of the projection of the ultrasonic transducer model to be established according to a second preset sound pressure calculation formula, and establishing the ultrasonic transducer model through three-dimensional software according to the z-coordinate value and the projection.
Preferably, the acquiring a detection sound field of the target body model according to the target body model to be ultrasonically detected further includes:
and establishing a target body model through finite element software according to the structural parameters of the target body to be ultrasonically detected.
Preferably, the calculating a z-coordinate value corresponding to each grid of the projection of the ultrasound transducer model to be established according to a second preset sound pressure calculation formula, establishing the ultrasound transducer model through three-dimensional software according to the z-coordinate value and the projection, and then further including:
and manufacturing an ultrasonic transducer through a 3D printer according to the ultrasonic transducer model.
Preferably, the first preset sound pressure calculation formula is:
p＝ρcAω
where ρ is the target volume medium density, c is the sound velocity, a is the amplitude, and ω is the angular frequency.
Preferably, the preset sound field attenuation formula is:
wherein x is the target thickness, p0The initial sound pressure.
Preferably, the second preset sound pressure calculation formula is:
wherein u isa(x, y, z) is the vibration velocity amplitude of the bin, a (x, y, z) is the initial phase of the bin, h (x, y, z) is the distance of the bin from the observation point, ρ is the medium density, k is the wave number, and w is the angular velocity.
Preferably, the half divergence angle is:
wherein λ is the wavelength, DsThe diameter of a circular transducer.
In a second aspect, the present application provides an ultrasound transducer obtained by modeling an ultrasound transducer established by any one of the above ultrasound transducer modeling methods.
A third aspect of the present application provides an ultrasonic transducer modeling apparatus comprising: a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute any one of the above-mentioned ultrasound transducer modeling methods according to instructions in the program code.
A fourth aspect of the present application provides a computer-readable storage medium for storing program code for performing any one of the above-described ultrasound transducer modeling methods.
According to the technical scheme, the method has the following advantages:
the application provides an ultrasonic transducer model manufacturing method, which comprises the following steps: acquiring a detection sound field of a target body model according to the target body model to be subjected to ultrasonic detection; determining detection parameters of the ultrasonic transducer according to the detection sound field, and calculating the working frequency of the ultrasonic transducer according to the detection parameters, wherein the detection parameters comprise: speed of sound, resolution, and half spread angle; calculating the wave source initial sound pressure of the ultrasonic transducer model according to the working frequency and a first preset sound pressure calculation formula, dividing grids of a detected sound field through finite element software, and calculating the sound pressure value of each grid according to a preset sound field attenuation formula; calculating the projection of the ultrasonic transducer model to be established on the xoy plane of the established ultrasonic transducer space rectangular coordinate system according to the half diffusion angle and the detection sound field, and meshing the projection by finite element software; and calculating a z-coordinate value corresponding to each grid of the projection of the ultrasonic transducer model to be established according to a second preset sound pressure calculation formula, and establishing the ultrasonic transducer model through three-dimensional software according to the z-coordinate value and the projection. The ultrasonic transducer model manufacturing method provided by the application builds a model for a target body to be detected and obtains effective detection sound field distribution of the target body model, respectively obtains projection of an ultrasonic transducer on an xoy plane of a space rectangular coordinate system and a z coordinate value corresponding to the projection through a detection parameter and a preset formula, thereby building an ultrasonic transducer model through three-dimensional software, and then manufacturing the ultrasonic transducer according to the ultrasonic transducer model, because the ultrasonic transducer obtained by the method is obtained on the basis of the detection sound field of the target body model, calculates a sound pressure value at each grid of the detection sound field through the sound field distribution of the target body, calculates the projection of the ultrasonic transducer to be built on the xoy plane of the space rectangular coordinate system of the ultrasonic transducer according to a half diffusion angle of the detection sound field, utilizes a second preset sound pressure calculation formula according to the sound pressure value at each grid, and calculating a z-coordinate value corresponding to each grid on the xoy plane, wherein the sound field of the ultrasonic transducer model established according to the projection and the z-coordinate value is a sound field which is valuable to a target body, so that the sound field with low value or without value is reduced, the detection sensitivity of the ultrasonic transducer is improved, the detection blind area is avoided, and the technical problem that the ultrasonic detection effect is poor due to the fact that the ultrasonic transducer obtained by the existing ultrasonic transducer model manufacturing method is prone to have the detection blind area and low sensitivity in the area to be detected is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic flow chart diagram illustrating one embodiment of a method for modeling an ultrasound transducer as provided herein;
FIG. 2 is a schematic flow chart diagram illustrating another embodiment of an ultrasound transducer modeling method provided herein;
fig. 3 is a schematic diagram of a detection sound field distribution area of a target to be detected provided by the present application;
fig. 4 is a schematic view of a near-field region sound pressure distribution of a target to be detected provided by the present application;
fig. 5 is a schematic projection diagram of an ultrasound transducer model provided in the present application on xoy plane of an ultrasound transducer spatial rectangular coordinate system.
Detailed Description
The embodiment of the application provides an ultrasonic transducer model manufacturing method and device, which are used for solving the technical problems that an ultrasonic transducer obtained by the existing ultrasonic transducer model manufacturing method is easy to have a detection blind area and low sensitivity in a region to be detected, so that the ultrasonic detection effect is poor
In order to make the purpose, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic flowchart illustrating an embodiment of a method for modeling an ultrasonic transducer according to the present application. One embodiment of an ultrasound transducer modeling method provided herein includes:
step 101: and acquiring a detection sound field of the target body model according to the target body model to be subjected to ultrasonic detection.
It should be noted that each target to be detected has an effective sound field range, so that after the target model is built, a corresponding detection sound field range can be obtained, and the sound field in this range is effective detection sound field for the target.
Step 102: determining detection parameters of the ultrasonic transducer according to the detection sound field, and calculating the working frequency of the ultrasonic transducer according to the detection parameters, wherein the detection parameters comprise: speed of sound, resolution, and half-spread angle.
It should be noted that after the detection sound field is determined, the detection parameters of the ultrasonic transducer can be determined, such as the half-diffusion angle θ in fig. 3, and the sound velocity can be calculated according to the longitudinal wave sound velocity
Or formula for calculating velocity of transverse wave sound
And calculating to obtain that the wavelength and the resolution have a relation: r ═ 0.6-1.5). λ, there is a relationship between wavelength and operating frequency:
thus, the operating frequency of the transducer can be calculated.
Step 103: calculating the initial sound pressure of a wave source of the ultrasonic transducer to be established according to the working frequency and a first preset sound pressure calculation formula, dividing grids for a detection sound field through finite element software, and calculating the sound pressure value of each grid according to a preset sound field attenuation formula.
It should be noted that the wave source is an object or an initial position of the object that can maintain the propagation of the vibration, input energy without interruption, and emit the wave. The ultrasonic transducer needs to detect a target body and provides a wave source to transmit to the target body, so that the initial sound pressure of the wave source of the ultrasonic transducer needs to be calculated, and the initial sound pressure can be obtained by calculating through a sound pressure calculation formula according to the working frequency of the ultrasonic transducer. Meshing of a detected sound field by finite element software is a known technology, and will not be described in detail herein, and after the meshing is completed, since the initial sound pressure is known, the sound pressure value at each mesh can be calculated by a preset sound field attenuation formula. As shown in fig. 4, fig. 4 is a near-field sound pressure distribution diagram of a target, both an ultrasonic probe and an ultrasonic transducer have a near-field region N, a main sound velocity emitted by the ultrasonic transducer is divided into an undispersed region (<1.64N), a transition region (1.64N-3N) and a diffused region (>3N), an effective sound field of the target is defined to be within a range of 3N and exceed 3N, the ultrasonic sound velocity is located in the diffused region, attenuation is large, and detection sensitivity is low.
Step 104: and calculating the projection of the ultrasonic transducer model to be established on the xoy plane of the established ultrasonic transducer space rectangular coordinate system according to the half diffusion angle and the detection sound field, and meshing the projection by finite element software.
It should be noted that, because there is a correlation between the half diffusion angle of the sound field and the wavelength and the length and width of the ultrasonic transducer, the projection size of the ultrasonic transducer model on the xoy plane of the ultrasonic transducer space rectangular coordinate system can be calculated through the half diffusion angle, and after the projection is obtained, the projection is subjected to mesh division through finite element software, as shown in fig. 5.
Step 105: and calculating a z-coordinate value corresponding to each grid of the ultrasonic transducer in the projection according to a second preset sound pressure calculation formula, and establishing an ultrasonic transducer model through three-dimensional software according to the z-coordinate value and the projection.
It should be noted that after the projection on the xoy plane is obtained and the projection is subjected to grid division, according to a preset sound pressure calculation formula, a z-coordinate value corresponding to each grid in the ultrasonic transducer space rectangular coordinate system can be calculated, and according to the projection on the xoy plane and the z-coordinate value corresponding to each grid, an ultrasonic transducer model can be established through three-dimensional software.
The method for manufacturing the ultrasonic transducer model provided by the embodiment of the application establishes a model for a target body to be detected and obtains effective detection sound field distribution of the target body model, respectively obtains projection of an ultrasonic transducer on a xoy plane of a space rectangular coordinate system and a z coordinate value corresponding to the projection through a detection parameter and a preset formula, thereby establishing the ultrasonic transducer model through three-dimensional software, and then manufacturing the ultrasonic transducer according to the ultrasonic transducer model, because the ultrasonic transducer obtained by the method is obtained on the basis of the detection sound field of the target body model, a sound pressure value of each grid of the detection sound field is calculated through the sound field distribution of the target body, meanwhile, the projection of the ultrasonic transducer to be established on the xoy plane of the space rectangular coordinate system of the ultrasonic transducer is calculated according to a half diffusion angle of the detection sound field, a second preset sound pressure calculation formula is utilized according to the sound pressure value of each grid, and calculating a z-coordinate value corresponding to each grid on the xoy plane, wherein the sound field of the ultrasonic transducer model established according to the projection and the z-coordinate value is a sound field which is valuable to a target body, so that the sound field with low value or without value is reduced, the detection sensitivity of the ultrasonic transducer is improved, the detection blind area is avoided, and the technical problem that the ultrasonic detection effect is poor due to the fact that the ultrasonic transducer obtained by the existing ultrasonic transducer model manufacturing method is prone to have the detection blind area and low sensitivity in the area to be detected is solved.
The above is an embodiment of an ultrasound transducer modeling method provided by the present application, and the following is another embodiment of an ultrasound transducer modeling method provided by the present application.
Referring to fig. 2, fig. 2 is a schematic flowchart of another embodiment of an ultrasound transducer modeling method provided in the present application, where the ultrasound transducer modeling method further includes, on the basis of the previous embodiment, before step 101:
step 100: and establishing a target body model through finite element software according to the structural parameters of the target body to be ultrasonically detected.
It should be noted that the structural parameters of the target may be length, width, height, and the like obtained by measuring the target entity with a measuring tool, or may be structural parameters obtained from a design drawing of the target. After obtaining the structural parameters of the target volume, a model of the target volume may be established by finite element software based on the structural parameters of the target volume.
Further, step 105 is followed by:
step 106: and manufacturing the ultrasonic transducer through a 3D printer according to the ultrasonic transducer model.
It should be noted that a 3D printer, also called a three-dimensional printer, is a machine of an accumulation manufacturing technology, i.e. a rapid prototyping technology, which is based on a digital model file, and manufactures a three-dimensional object by printing a layer-by-layer adhesive material using a special adhesive material such as wax, powdered metal or plastic. The design process of 3D printing is that firstly, modeling is carried out through computer modeling software, and then the built three-dimensional model is partitioned into sections layer by layer, namely 'slices', so that the printer is guided to print layer by layer to obtain a final finished product. Thus, in the present application, after obtaining the ultrasound transducer model, the ultrasound transducer may be fabricated by a 3D printer.
Further, the first preset sound pressure calculation formula is as follows:
p＝ρcAω
where ρ is the target volume medium density, c is the sound velocity, a is the amplitude, and ω is the angular frequency.
Further, the preset sound field attenuation formula is as follows:
wherein x is the target thickness, p0The initial sound pressure.
It should be noted that, in the ultrasonic detection, the directly measurable quantity is the decibel of the ratio of the two sound pressures, so that the attenuation coefficient can be measured by the decibel of the sound pressure attenuation after the ultrasonic wave passes through a target body with a certain thickness, and after the attenuation coefficient is obtained, the sound pressure value at each grid can be calculated by the attenuation coefficient formula and the initial sound pressure.
Further, the second preset sound pressure calculation formula is as follows:
wherein u isa(x, y, z) is the vibration velocity amplitude of the bin, a (x, y, z) is the initial phase of the bin, h (x, y, z) is the distance of the bin from the observation point, ρ is the medium density, k is the wave number, and w is the angular velocity.
It should be noted that a bin, i.e., an array element, is a basic transduction unit of the array transducer, and each grid in this application is a bin. The distance from the surface element to the observation point is the distance from the array element to a certain point in the sound field range.
Are well known in the art and will not be described in detail herein.
Further, the half divergence angle is:
wherein, the lambda is the wavelength,Dsthe diameter of a circular transducer.
It should be noted that, for the correspondence between the diameter of the circular transducer and the half-diffusion angle, it can be determined as
For a rectangular transducer, a correspondence in the yoz plane, which is the correspondence in the yoz plane, and a correspondence in the xoz plane can be divided
b is the length of the rectangular transducer, and the corresponding relationship in the xoz plane is
a is the width of the rectangular transducer.
The above is another embodiment of an ultrasound transducer modeling method provided by the present application, and the following is an embodiment of an ultrasound transducer model provided by the present application.
An ultrasonic transducer is obtained by making an ultrasonic transducer model established by the ultrasonic transducer model making method in any one of the embodiments.
The present application also provides an ultrasound transducer modeling apparatus, comprising: a processor and a memory;
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is configured to execute the ultrasound transducer modeling method of the above-described embodiment according to instructions in the program code.
The present application also provides a computer-readable storage medium for storing program code for performing the ultrasound transducer modeling method of the above-described embodiments.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses, apparatuses and modules may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus, device and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of modules is merely a division of logical functions, and an actual implementation may have another division, for example, a plurality of modules or components may be combined or integrated into another apparatus, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
The integrated modules, if implemented in the form of software functional modules and sold as separate products or to be detected, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Claims (7)
1. An ultrasonic transducer modeling method, comprising:
acquiring a detection sound field of a target body model according to the target body model to be subjected to ultrasonic detection;
determining detection parameters of the ultrasonic transducer according to the detection sound field, and calculating the working frequency of an ultrasonic transducer model to be established according to the detection parameters, wherein the detection parameters comprise: speed of sound, resolution, and half spread angle;
calculating the wave source initial sound pressure of the ultrasonic transducer model to be established according to the working frequency and a first preset sound pressure calculation formula, dividing grids for the detection sound field through finite element software, and calculating the sound pressure value of each grid according to a preset sound field attenuation formula;
calculating the projection of the ultrasonic transducer model to be established on the xoy plane of the established ultrasonic transducer space rectangular coordinate system according to the half diffusion angle and the detection sound field, and meshing the projection by the finite element software;
calculating a z-coordinate value corresponding to each grid of the projection of the ultrasonic transducer model to be established according to a second preset sound pressure calculation formula, and establishing the ultrasonic transducer model through three-dimensional software according to the z-coordinate value and the projection;
the first preset sound pressure calculation formula is as follows:
p＝ρcAω
wherein rho is the density of the target medium, c is the sound velocity, A is the amplitude, and omega is the angular frequency;
the preset sound field attenuation formula is as follows:
where x is the thickness of the acoustic wave through the target, p0Is the starting sound pressure of the sound field;
the second preset sound pressure calculation formula is as follows:
wherein u isa(x, y, z) is the vibration velocity amplitude of the bin, a (x, y, z) is the initial phase of the bin, h (x, y, z) is the distance of the bin from the observation point, ρ is the medium density, k is the wave number, and w is the angular velocity.
2. The method for modeling an ultrasonic transducer according to claim 1, wherein the obtaining a detection sound field of a target body model according to the target body model to be ultrasonically detected further comprises:
and establishing a target body model through finite element software according to the structural parameters of the target body to be ultrasonically detected.
3. The method for manufacturing an ultrasound transducer model according to claim 1 or 2, wherein the method includes calculating a z-coordinate value corresponding to each grid of the projection of the ultrasound transducer model to be built according to a second preset sound pressure calculation formula, building the ultrasound transducer model by a three-dimensional software according to the z-coordinate value and the projection, and then:
and manufacturing an ultrasonic transducer through a 3D printer according to the ultrasonic transducer model.
4. The method of modeling an ultrasound transducer according to claim 1 or 2, wherein the half-diffusion angle is:
wherein λ is the wavelength, DsThe diameter of a circular transducer.
5. An ultrasonic transducer obtained by modeling an ultrasonic transducer according to the ultrasonic transducer modeling method of any one of claims 1 to 4.
6. An ultrasound transducer modeling apparatus, comprising: a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the ultrasound transducer modeling method of any of claims 1-4 according to instructions in the program code.
7. A computer-readable storage medium, characterized in that the computer-readable storage medium is configured to store a program code for performing the ultrasound transducer modeling method of any of claims 1-4.
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