CN102589679A - Method for visualizing dynamic sound field - Google Patents
Method for visualizing dynamic sound field Download PDFInfo
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- CN102589679A CN102589679A CN2012100462552A CN201210046255A CN102589679A CN 102589679 A CN102589679 A CN 102589679A CN 2012100462552 A CN2012100462552 A CN 2012100462552A CN 201210046255 A CN201210046255 A CN 201210046255A CN 102589679 A CN102589679 A CN 102589679A
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Abstract
In order to solve the problems that the sound wave is hard to observe when the sound wave is propagated in a medium and the propagation process is hard to research when the sound wave is propagated in the medium, the invention provides a method for visualizing a dynamic sound field, comprising the following steps of: by obtaining sound wave data of each grid point on the surface of each moment medium, building pixel data which corresponds to each grid point to obtain a sound wave image on the surface of each moment medium, and playing the acquired sound wave image according to time sequence frame by frame, so that the dynamic sound field can be visualized.
Description
One, technical field
The present invention relates to a kind of method for visualizing, relate more particularly to a kind of method for visualizing of dynamic sound field.
Two, background technology
Sound wave is the stress wave that a kind of people can't observe directly, and utilizes rules such as the propagation of sound wave in medium, reflection can be used for sonar, ultrasonic inspection etc. and uses.In the process that sound wave is studied, need get information about the communication process of sound wave in medium.The method of tradition research sound wave mainly is to analyze the acoustical signal that acoustic wave transducer receives at material surface, thus the propagation law of inference sound wave in material.
Along with the development of modern acoustics technology and detection technique, the visual new technique of various sound waves is used in the fields such as research, medical science, industrial nondestructive testing.The communication process of sound wave in material can't Direct observation and measurement, thereby work has brought very big difficulty to study of sound field. and visible for sound wave is become, let people be familiar with more intuitively and study these complex sound fields, methods such as dynamic photoelasticity have appearred.
Three, summary of the invention
The objective of the invention is to solve sound wave communication process in medium is difficult to observe; Be unfavorable for problem that communication process is studied; Thereby, also be that the inner structure of surveying the medium of sound transmission itself provides a kind of mode simultaneously for the propagation of observing and study sound wave provides a kind of more direct mode.
To achieve these goals, the present invention provides a kind of dynamic sound field method for visualizing, and it comprises the steps: 1) a pair of acoustic wave transducer is provided, one of them is as soic wave transmitting energy converter, and another one is accepted transducer as sound wave; 2) two transducers are coupled to the dielectric material surface, wherein soic wave transmitting energy converter is fixed, and sound wave is accepted transducer then according to certain path movement; 3) with the form of grid the surface of dielectric material is divided; 4) sound wave is accepted transducer and on dielectric surface, is moved;, this sound wave stops to move when accepting on the node that transducer whenever moves to a grid; Let soic wave transmitting energy converter launch one section sound wave short pulse along all directions; Wherein acoustic wave segment directly arrives receiving end through the medium between the transducer; Acoustic wave energy receives the reflection of medium inner structure, the decay that scattering causes sound wave, and other a part of sound wave is reflected or repeatedly reflection also can arrive acoustic receiver within a certain period of time; In transmitting transducer emission sound wave, accept transducer and also start waveform recording sound wave, after after a while, stop record; 5) stop record after, continue to move sound wave and accept transducer, after it arrives new grid node, repeat above-mentioned steps 4), up to the surface of complete material of scanning; Accept transducer after spreading all over each grid node of dielectric surface, with obtaining each node waveform in a period of time after sound wave emissions; 6) data processing is carried out in the waveform recording of grid node and collection, set up the image corresponding, wherein the corresponding pixel of each grid node with dielectric surface; Take out the amplitude in the identical moment of each net point, obtain corresponding image of this moment through the magnitudes of acoustic waves and the one-to-one relationship of pixel value; And 7) obtain each image constantly according to step 6), and these images are play by frame, promptly can observe the communication process of whole waveform according to time sequencing.
Further preferred, the acoustic wave transducer that adopts in this method is a piezoelectric chip.
Further preferred, the sound wave couplant through any appropriate in this method is coupled to the dielectric material surface with two acoustic wave transducers.
Further preferred, the waveform recording of being gathered in this method carries out record for computing machine through adapter passes.
Further preferred, the one-to-one relationship of magnitudes of acoustic waves and pixel value is in this method: the big more grey scale pixel value of amplitude is big more, and the small pixel gray-scale value is more little more for amplitude.
Advantage of the present invention is; Can reproduce the process of sound wave in medium in visual pattern ground; It is wider to compare the suitable material ranges of additive method (like the dynamic photoelasticity method), can be used for the Propagation Characteristics of sound wave, the acoustic characteristic of material and the Non-Destructive Testing of material etc.
Four, description of drawings
Fig. 1 is for using the system construction drawing of method described in the invention.
Sound wave media plane 2, sound wave receiving transducer 3, soic wave transmitting energy converter 4, adapter 5, computing machine in the drawings, 1.
Fig. 2 is the oscillogram of 3 of a among the pulse of acoustic wave transducer emission and Fig. 1, b, c.
In the drawings, the waveform on the time shaft t0 is the pulse waveform of acoustic wave transducer emission, and ta, tb, the last waveform of tc are respectively acoustic wave transducer and move to a, b and 3 received waveforms of c.
Five,
Embodiment
Concrete implementation procedure of the present invention is divided into the collection of acoustic signals and reproduction two parts of communication process.
The collection of acoustic signals: as shown in Figure 1; Place sound wave receiving transducer 2 and soic wave transmitting energy converter 3 through suitable sound wave couplant on the sound wave media plane 1; Wherein soic wave transmitting energy converter 3 is fixed, and sound wave receiving transducer 2 is along certain path movement, then stops to move etc. to be measured in the time of on the node that arrives grid; At first launch the sound wave of a short pulse in the measuring process according to the waveform on the t0 axle among Fig. 2 through adapter 4 control soic wave transmitting energy converters by computing machine 5; Simultaneously, computing machine 5 begins the voltage waveform through adapter 4 acquisition and recording sound wave receiving transducers 2, and sound wave arrives sound wave receiving transducer 2 through sound wave media plane 1 earlier; Got off by computing machine 5 acquisition and recordings; A part of in addition sound wave can arrive equally and can go on record when running into edge or the inherent vice in the medium of sound wave media plane 1, and after a period of time, computing machine 5 stops record; Sound wave receiving transducer 2 moves to next grid node, and repeats above process can be accomplished acoustic signals until all grid nodes of traversal collection.
The reproduction of sonic propagation process: in the gatherer process of acoustic signals; All be that x time with sound wave is a starting point in the process of each collection waveform, for example, a, b and c arranged at 3 among Fig. 1 on the sound wave media plane 1; Corresponding waveform is respectively time shaft ta, tb and tc among Fig. 2; The waveform of all grid nodes is alignd according to same form, take out the sound wave range value on each grid node of a certain moment, then this range value is converted into gray values of pixel points (or color value) according to certain mapping relations; Then these pixels are synthesized image according to the set of locations of corresponding net point; The spread state that can represent this moment sound wave uses identical method, changes the image that each waveform transformation constantly becomes a width of cloth width of cloth; Then the sequencing of these images according to the time played back, can obtain the communication process video of sound wave.Thereby can observe the propagation of sound wave intuitively and on the border and the reflection of medium inherent vice.
Claims (5)
1. dynamic sound field method for visualizing, it comprises the steps:
1) a pair of acoustic wave transducer (2,3) is provided, one of them is as soic wave transmitting energy converter (3), and another one is accepted transducer (2) as sound wave;
2) two transducers are coupled to dielectric material surface (1), wherein soic wave transmitting energy converter (3) is fixed, and sound wave is accepted transducer (2) then according to certain path movement;
3) with the form of grid the surface (1) of dielectric material is divided;
4) sound wave is accepted transducer (2) and on dielectric surface, is moved;, this sound wave stops to move when accepting on the node that transducer (2) whenever moves to a grid; Let soic wave transmitting energy converter (3) launch one section sound wave short pulse along all directions; Wherein acoustic wave segment directly arrives receiving end through the medium between the transducer; Acoustic wave energy receives the reflection of medium inner structure, the decay that scattering causes sound wave, and other a part of sound wave is reflected or repeatedly reflection also can arrive acoustic receiver within a certain period of time; In transmitting transducer (3) emission sound wave, accept transducer (2) and also start waveform recording sound wave, after after a while, stop record;
5) stop record after, continue to move sound wave and accept transducer (2), after it arrives new grid node, repeat above-mentioned steps 4), up to the surface of complete material of scanning; Accept transducer (2) after spreading all over each grid node of dielectric surface, with obtaining each node waveform in a period of time after sound wave emissions;
6) data processing is carried out in the waveform recording of grid node and collection, set up the image corresponding, wherein the corresponding pixel of each grid node with dielectric surface; Take out the amplitude in the identical moment of each net point, obtain corresponding image of this moment through the magnitudes of acoustic waves and the one-to-one relationship of pixel value; And
7) obtain each image constantly according to step 6), and these images are play the communication process of visual whole waveform by frame according to time sequencing.
2. dynamic sound field method for visualizing as claimed in claim 1, the acoustic wave transducer that wherein adopts in this method is a piezoelectric chip.
3. dynamic sound field method for visualizing as claimed in claim 1, wherein the sound wave couplant through any appropriate is coupled to dielectric material surface (1) with two acoustic wave transducers (2,3) in this method.
4. dynamic sound field method for visualizing as claimed in claim 1, the waveform recording of wherein being gathered in this method pass to computing machine (5) through adapter (4) and carry out record.
5. dynamic sound field method for visualizing as claimed in claim 1, wherein the one-to-one relationship of magnitudes of acoustic waves and pixel value is in this method: the big more grey scale pixel value of amplitude is big more, and the small pixel gray-scale value is more little more for amplitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100462552A CN102589679A (en) | 2012-02-28 | 2012-02-28 | Method for visualizing dynamic sound field |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100462552A CN102589679A (en) | 2012-02-28 | 2012-02-28 | Method for visualizing dynamic sound field |
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| CN2012100462552A Pending CN102589679A (en) | 2012-02-28 | 2012-02-28 | Method for visualizing dynamic sound field |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879763A (en) * | 2012-09-11 | 2013-01-16 | 上海交通大学 | System and method for quickly positioning noise source through image identification and sound intensity scanning |
| CN107449826A (en) * | 2017-08-17 | 2017-12-08 | 中国石油大学(华东) | Fluid distrbution detection method and device |
-
2012
- 2012-02-28 CN CN2012100462552A patent/CN102589679A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879763A (en) * | 2012-09-11 | 2013-01-16 | 上海交通大学 | System and method for quickly positioning noise source through image identification and sound intensity scanning |
| CN107449826A (en) * | 2017-08-17 | 2017-12-08 | 中国石油大学(华东) | Fluid distrbution detection method and device |
| CN107449826B (en) * | 2017-08-17 | 2018-05-22 | 中国石油大学(华东) | Fluid distrbution detection method and device |
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Application publication date: 20120718 |