CN105139847A - Enhanced acoustic focusing device - Google Patents
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- CN105139847A CN105139847A CN201510501627.XA CN201510501627A CN105139847A CN 105139847 A CN105139847 A CN 105139847A CN 201510501627 A CN201510501627 A CN 201510501627A CN 105139847 A CN105139847 A CN 105139847A
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Abstract
The invention discloses an enhanced acoustic focusing device which comprises the components of a signal source, a lead, an electroacoustic transducer and a semiclosed space structure. The semiclosed space structure is composed of a chamber, the electroacoustic transducer, and a recessed curved surface on which a plurality of through holes are arranged on the cambered surface. The central axes of the through holes are crossed at a same focal point. The semiclosed space structure is communicated with outside through the through holes. The semiclosed space structure belongs to the structure of a Helmholtz resonator. Each dimension parameter of the semiclosed space structure is designed according to the structure parameter characteristic of the Helmholtz resonator. The position and the direction of each through hole on the cambered surface are determined according to the number of the through holes, the arrangement manner of the through holes on the cambered surface and a distance between the focal point and the vertex of the recessed curved surface. The resonance frequency of the semiclosed space structure, the working frequency of the electroacoustic transducer and the frequency of an acoustic wave which is focused by the recessed curved surface are same. An enhanced acoustic focusing function is realized by means of an acoustic pressure amplification principle of the Helmholtz resonator in a multi-through-hole recessed curved surface focusing manner.
Description
Technical field
The invention belongs to the technical field of acoustical signal strengthening and acoustic energy focusing, specifically, relate to a kind of Acoustic focusing device of enhancing.
Background technology
Acoustic energy can be gathered focus by Acoustic focusing technology, realizes the acoustic pressure amplitude at focus place, Particle Vibration Velocity amplitude and acoustical power and reaches maximal value.Acoustic focusing technology is widely used in the field such as the suspension of acoustics particle or migration, the detection of acoustics display device, medical ultrasonic and supersonic operation.Multiple electroacoustics transducer unit that sound focusing device traditional at present utilizes annular array to arrange usually realize the transformation of electric signal and acoustical signal and then produce Acoustic focusing effect according to doughnut structure, or utilize acoustic lens to reach object to plane sound beam focusing.
For multiple electroacoustics transducers that annular array is arranged, array element quantity due to transducer array in the making, maintenance process of Acoustic focusing device is larger, be difficult to meet multiple parts entirety in focalizer and realize the condition of optimum coupling, also add difficulty to safeguarding and changing suitable parts simultaneously; And in use, compare the focalizer of single transducer, multiple transducer can increase the electric work consumption in electroacoustic transfer process undoubtedly.In addition, in the actual fabrication process of device, due to the uncontrollable factor (as the instability of Mechanical Running Condition, the disparity etc. of material diverse location physical property) that structure fabrication exists, the structure of any two electroacoustics transducers can not be identical, thus can not produce identical sound wave, also just be difficult to produce desirable sound focusing effect.
For acoustic lens, the structure precision of acoustic lens requires very high to the manufacturing process of acoustic lens, therefore can not reach enough accuracy classes easily in the preparation of lens, add the complicacy of manufacturing process undoubtedly.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of Acoustic focusing device of enhancing, utilize Helmholtz resonator function by through hole outwardly radiant high intensity sound wave under resonant frequency condition, cambered surface designs multiple through holes of annular array arrangement, realizes the function of the Acoustic focusing strengthened.
Technical scheme: for achieving the above object, the technical solution used in the present invention is a kind of Acoustic focusing device of enhancing, comprises signal source and wire, it is characterized in that, comprises electroacoustics transducer and hemi-closure space structure; Described wire is by signal source and electroacoustics transducer composition closed-loop path;
Described hemi-closure space structure comprises cavity, electroacoustics transducer and concave curved surface; Closely to connect successively concave curved surface, cavity and electroacoustics transducer according to the central axis of concave curved surface;
Described hemi-closure space structure is communicated with the external world by the through hole of the n in cambered surface, the hole wall of described each through hole smooth and with through hole centerline axis parallel, all through hole central axis intersect at same focus O;
Described electroacoustics transducer is positioned at the A1 end interface place of cavity, and described concave curved surface is positioned at the A2 end interface place of cavity;
Described hemi-closure space structure is Helmholtz resonator structure;
The characteristic length in the cavity maximum transversal cross section of described cavity and the characteristic length of the maximum longitudinal cross-section of cavity are all less than the wavelength of focused sound waves.
Further, concave curved surface comprises cambered surface, and an annular array distribution n through hole in cambered surface, wherein, n gets the integer being not less than 3.
Further, concave curved surface is the spherical structure of spill.
Further, concave curved surface is paraboloid structure.
Further, the frequency of the frequency of operation of electroacoustics transducer, the resonant frequency of hemi-closure space structure and concave curved surface focused sound waves is equal.
Beneficial effect: in hemi-closure space structure, electroacoustics transducer produces the sound wave with Helmholtz resonator same frequency, each through hole that can realize sound wave annular array distribution in cambered surface under the resonance amplification of Helmholtz resonator towards focus place outwardly radiation multi beam high strength sound wave and interfere at focus place, form the Acoustic focusing effect strengthened.
1) utilize Helmholtz resonator to realize the conversion of little amplitude acoustic wave to large amplitude sound wave, thus when needs produce strong focusing effect, the electric work consumption of electroacoustics transducer can be reduced.
2) device can use single electroacoustics transducer, avoids, when multiple electroacoustics transducer produces focused sound waves, hindering each electroacoustics transducer produce identical sound wave simultaneously because of textural difference in esse between electroacoustics transducer.Avoid as electroacoustic conversion effect difference in esse between multiple electroacoustics transducer.
3) device can use single electroacoustics transducer, avoid the problem brought when using combination to control, what can realize as adopted which kind of means that each electroacoustics transducer have when electroacoustic is changed is synchronous, or how to avoid electric signal transmission to the signal off resonance existed because of the resistance difference between multiple loop during each electroacoustics transducer.
4) compare the focalizer of multiple electroacoustics transducer, use the too much electric work consumption that single electroacoustics transducer can reduce or avoid multiple transducer to bring, and reduce device because electroacoustics transducer damages the probability that breaks down.
5) apparatus structure is simple, is convenient to make and operation maintenance.
Accompanying drawing explanation
Fig. 1 is the two dimensional cross-section schematic diagram of device of the present invention when n=81.
Fig. 2 is the assembling schematic diagram of device of the present invention when n=81.
Fig. 3 is the focus of device of the present invention when n=81 and concave curved surface summit schematic diagram.
Fig. 4 is the design diagram of the spheric concave curved surface of device of the present invention when n=81.
Fig. 5 is the schematic top plan view of the hemi-closure space structure of device of the present invention when n=81.
Fig. 6 is the partial 3 d schematic diagram of the spheric concave curved surface of device of the present invention when n=81.
Fig. 7 is the lead to the hole site of device of the present invention when n=81 and through hole central axial direction schematic diagram.
Fig. 8 is the Acoustic focusing schematic diagram of a kind of 2 focuses of the present invention.
Fig. 9 is one expansion shape cavity structure schematic diagram of the present invention.
In figure: 1-signal source, 2-wire, 3-electroacoustics transducer, 4-cavity, 41-cavity A1 end interface, 42-cavity A2 end interface, 43-expands shape cavity, the characteristic length in 44-cavity maximum transversal cross section, the characteristic length of the maximum longitudinal cross-section of 45-cavity, 5-concave curved surface, 51-through hole, 52-cambered surface, 511-through hole hole wall, 6-hemi-closure space structure, 7-assembling and positioning line, the assembly direction of 71-electroacoustics transducer and cavity, the assembly direction of 72-concave curved surface and cavity, the located lateral line of 8-focus O, 80-focus, 81-focus O
1, 82-focus O
2, the summit P of 9-concave curved surface, the located lateral line of 91-summit P, 92-concave curved surface central axis L, 10-through hole central axis, 101, 102, 103, 104, 105, 106, 107, 108-first, two, three, four, five, six, seven, eight through hole central axis, 1011, 1021, 1071, 1081-intersects at the through hole central axis of focus 81, 1031, 1041, 1051, 1061-intersects at the through hole central axis of focus 81, 11-through hole central axial direction, 111, 112, 113, 114, 115, 116, 117, 118-first, two, three, four, five, six, seven, eight through hole central axial direction, 12-through-hole aperture, 13-i-th through hole is to the distance R of concave curved surface central axis
i(i=1,2 ... 8), 14-focus O is to the distance D of summit P.
Embodiment
The invention provides a kind of Acoustic focusing device of enhancing, comprise signal source 1 and wire 2, it is characterized in that, comprise electroacoustics transducer 3 and hemi-closure space structure 6; Signal source 1 and electroacoustics transducer 3 are formed closed-loop path by described wire 2;
Described hemi-closure space structure 6 comprises cavity 4, electroacoustics transducer 3 and concave curved surface 5; According to concave curved surface 5 central axis successively closely connect concave curved surface 5, cavity 4 and electroacoustics transducer 3;
Described hemi-closure space structure 6 is communicated with the external world by the through hole of the n in cambered surface 51, and the hole wall 511 of described each through hole 51 is smooth and parallel with through hole central axis 10, and all through hole central axis 10 intersect at same focus O;
Described electroacoustics transducer 3 is positioned at A1 end interface 41 place of cavity 4, and described concave curved surface 5 is positioned at A2 end interface 42 place of cavity 4;
Described hemi-closure space structure 6 is Helmholtz resonator structure; The characteristic length 44 in the cavity maximum transversal cross section of the hemi-closure space of hemi-closure space structure 6 inside and the characteristic length 45 of the maximum longitudinal cross-section of cavity are all less than the wavelength of focused sound waves.According to the structural parameters characteristic Design of Helmholtz resonator;
The characteristic length 44 in the cavity maximum transversal cross section of described cavity 4 and the characteristic length 45 of the maximum longitudinal cross-section of cavity are less than the wavelength of focused sound waves.
Further, concave curved surface 5 comprises cambered surface 52, and an annular array distribution n through hole 51 in cambered surface 52, wherein, n gets the integer being not less than 3.
Further, concave curved surface 5 is spherical structures of spill.
Further, concave curved surface 5 is paraboloid structures.
Further, the frequency of the frequency of operation of electroacoustics transducer 3, the resonant frequency of hemi-closure space structure 6 and concave curved surface 5 focused sound waves is equal.
Described signal source 1 is the signal generator with regulation output power functions, and described electroacoustics transducer 3 is electromagnetic type or piezoelectric electro acoustic transducer.
Embodiment:
The Acoustic focusing device of a kind of enhancing of the present invention, comprise signal source 1, wire 2, electroacoustics transducer 3 and hemi-closure space structure 6, described hemi-closure space structure 6 is closely composed in series (as shown in Figure 2) according to the central axis of concave curved surface 5 successively by cavity 4, electroacoustics transducer 3 and concave curved surface 5, an annular array distribution n through hole 51 in the cambered surface 52 of described concave curved surface 5, n gets the integer (as shown in Figure 4, Figure 5 and Figure 6, getting n=81) being not less than 3; Described hemi-closure space structure 6 belongs to Helmholtz resonator structure, and its dimensional parameters is according to the structural parameters characteristic Design of Helmholtz resonator; Described hemi-closure space structure 6 is communicated by the through hole of the n in cambered surface 51 and the external world, and described each through hole hole wall 511 is smooth and parallel with through hole central axis 10, and described through hole central axis 10 intersects at same focus O; Described electroacoustics transducer 3 is positioned at the A1 end interface 41 of cavity 4, and described concave curved surface 5 is positioned at the A2 end interface 42 of cavity 4, and the dimensional parameters of described cavity 4 is less than the wavelength of focused sound waves; Signal source 1 and electroacoustics transducer 4 are formed closed-loop path by described wire 2; The frequency of the frequency of operation of described electroacoustics transducer 3, the resonant frequency of hemi-closure space structure 6 and concave curved surface 5 focused sound waves is equal.
Described concave curved surface 5 can be spherical structure; Central axial direction, the position of each through hole 51 on concave curved surface 5 of each through hole 51 cambered surface 52 is designed according to the length D of via-hole array distribution mode and the focal length line segment OP from focus O to concave curved surface 5 summit P in the number n of through hole 51, cambered surface.
Described concave curved surface 5 is face structures of spill, and described concave curved surface 5 can be paraboloid structure.
Described signal source 1 is the signal generator with regulation output power functions, and described electroacoustics transducer 3 is electromagnetic type or piezoelectric electro acoustic transducer.
Principle of work and the process of the Acoustic focusing device of a kind of enhancing of the present invention are: signal source 1 produces the frequency electric signal equal with hemi-closure space structure 6 resonant frequency, the excitation electroacoustics transducer 3 be positioned at bottom hemi-closure space structure 6 produces the little amplitude acoustic wave of same frequency, and then drive the air in hemi-closure space structure 6 to vibrate with equal Frequency Synchronization, the air column in through hole 51 is excited to carry out strong to-and-fro movement in through hole 51, and with the multi beam large amplitude sound wave of the central axial direction of through hole 51 outwardly radiation and through hole 51 equivalent amount, meet at focus O place, high-octane acoustic energy focusing point is produced after interfering superposition.
Focus and concave curved surface summit schematic diagram as shown in Figure 3, described focus 8 is intersection points of focus position line 80 and concave curved surface central axis 92, described concave curved surface summit 9 is the point of contacts of located lateral line 91 on concave curved surface 5 on concave curved surface summit, and the focus 8 of described concave curved surface and the summit 9 of concave curved surface are positioned on the central axis of concave curved surface simultaneously.
In described cambered surface 52, the central axis of each through hole 51 intersects at focus O, determines the position of each through hole 51 in cambered surface 52 and each through hole central axial direction according to the number n of through hole in the cambered surface 51 and distance D of focus O to concave curved surface summit P.
In apparatus of the present invention, the frequency of the frequency of operation of electroacoustics transducer 3, concave curved surface 5 focused sound waves is all equal with the resonant frequency of hemi-closure space structure 6, in this device each physical dimension parameter of hemi-closure space structure 6 and the relation of frequency satisfied:
F in formula
e, f
f, f
0be respectively the frequency of operation of electroacoustics transducer 3, the frequency of concave curved surface 5 focused sound waves and the resonant frequency of hemi-closure space structure 6.C
0for the velocity of sound, d
i(i=1,2 ... n) be i-th through-hole aperture (aperture of each through hole is identical) in cambered surface, n is that (n is integer for the number of through hole 51 in cambered surface, and n>=3), V is the internal capacity of hemi-closure space structure 6, and z is concave curved surface 5 thickness.In the actual design of device with in running, require f
e=f
f=f
0.
Further, case is focused on for a concrete engineering, the frequency f of focused sound waves
fwith the Project Focus demand that focused spot position is demand fulfillment, and then need to design suitable apparatus structure.Method for designing is, according to permission objective environment condition, drafts focalizer, and then can determine the length D of focal length OP of apparatus of the present invention.At f
e=f
0=f
fdesign constraint under, the frequency of the frequency of operation of electroacoustics transducer, the resonant frequency of hemi-closure space structure and concave curved surface focused sound waves is known quantity.Through hole number n in the cambered surface of presetting device and array distribution mode (as Fig. 1 ~ 7, n=81, i=1,2 ... 8) after, i-th through hole is to the distance R of concave curved surface central axis
i(as Fig. 4, i=1,2 ... 8) be known quantity.The thickness z of cambered surface is by formula z=(2m+1) c
0/ (2f
0)-D calculating, wherein m is integer and m>=0; In cambered surface, each through hole central axial direction is according to through hole central axis l
iwith the angle theta of concave curved surface central axis L
i Determine; According to constraint condition
Each dimensional parameters of design apparatus structure.
Further, for another Project Focus case, when demand focused spot with allow focalizer of the present invention can after residing position determines, the length D of focal length OP be known variables, needs to design suitable apparatus structure.After the through hole number n and the array distribution mode of through hole in cambered surface of presetting device, (as Fig. 1 ~ 7, n=81, i=1,2 ... 8) after, i-th through hole is to the distance R of concave curved surface central axis
i(as Fig. 4, i=1,2 ... 8) be known quantity, calculate through hole central axis l
iwith the angle theta of concave curved surface central axis L
i and then determine through hole central axis l
i.In the frequency f of presetting focused sound waves
fafter, according to f
e=f
0=f
fdetermine the frequency of electroacoustics transducer frequency of operation, concave curved surface focused sound waves and the resonant frequency of hemi-closure space structure; The thickness z of cambered surface is by formula z=(2m+1) c
0/ (2f
0)-D calculating, wherein m is integer and m>=0; According to constraint condition
each dimensional parameters of design apparatus structure.
Further, as shown in Figure 8, be a kind of embodiment that the Acoustic focusing device of a kind of enhancing of the present invention produces 2 focus points.In described cambered surface, the corresponding central axis of each through hole intersects at focus 81 and 82 respectively, and the through hole central axis namely intersecting at focus 81 is 1011,1021,1071,1081, and the through hole central axis intersecting at focus 82 is 1031,1041,1051,1061.Apparatus of the present invention operationally, the little amplitude acoustic wave of described electroacoustics transducer strengthens as multi beam large amplitude sound wave through hemi-closure space structure 6, large amplitude sound wave outwardly radiation time, part sound wave is propagated to focus 81 place according to the direction of through hole central axis (as 1011,1021,1071,1081), and another part sound wave is propagated to focus 82 place according to the direction of through hole central axis (as 1031,1041,1051,1061).The acoustic beam converging in focus 81 and focus 82 place respectively produces acoustic energy in focus 81 and focus 82 place and focuses on after mutually interfering and superposing.Further, according to the method, a kind of enhancement mode Acoustic focusing device of the present invention can produce multiple focus point.
Further, as shown in Figure 9, be the another kind of embodiment of the Acoustic focusing device of a kind of enhancing of the present invention, described concave curved surface 5, expansion shape cavity 43 and electroacoustics transducer 3 are closely connected in series successively according to the central axial direction of concave curved surface 5.Described expansion shape cavity 43 is the sound passage of expansion structure and belongs to Helmholtz resonator structure, and described expansion shape cavity 43 has the feature of expansion shape passage and Helmholtz resonator simultaneously.The little amplitude acoustic wave of electroacoustics transducer 3 generation strengthens as multi beam large amplitude sound wave after expanding shape cavity 43, meets, interferes superposition rear generation acoustic energy focusing point at focus 8 place.
Claims (5)
1. the Acoustic focusing device strengthened, comprises signal source (1) and wire (2), it is characterized in that, comprise electroacoustics transducer (3) and hemi-closure space structure (6); Described wire (2) is by signal source (1) and electroacoustics transducer (3) composition closed-loop path;
Described hemi-closure space structure (6) comprises cavity (4), electroacoustics transducer (3) and concave curved surface (5); Closely to connect successively concave curved surface (5), cavity (4) and electroacoustics transducer (3) according to the central axis of concave curved surface (5);
Described hemi-closure space structure (6) is communicated with the external world by the through hole of the n in cambered surface (51), the hole wall (511) of described each through hole (51) is smooth and parallel with through hole central axis (10), and all through hole central axis (10) intersect at same focus (O);
Described electroacoustics transducer (3) is positioned at A1 end interface (41) place of cavity (4), and described concave curved surface (5) is positioned at A2 end interface (42) place of cavity (4);
Described hemi-closure space structure (6) is Helmholtz resonator structure;
The characteristic length (44) in the cavity maximum transversal cross section of described cavity (4) and the characteristic length (45) of the maximum longitudinal cross-section of cavity are all less than the wavelength of focused sound waves.
2. the Acoustic focusing device of a kind of enhancing as claimed in claim 1, it is characterized in that, concave curved surface (5) comprises cambered surface (52), the upper annular array distribution n through hole (51) of cambered surface (52), wherein, n gets the integer being not less than 3.
3. the Acoustic focusing device of a kind of enhancing as claimed in claim 2, is characterized in that, described concave curved surface (5) is the spherical structure of spill.
4. the Acoustic focusing device of a kind of enhancing as claimed in claim 2, is characterized in that, described concave curved surface (5) is paraboloid structure.
5. the Acoustic focusing device of a kind of enhancing as claimed in claim 1, it is characterized in that, the frequency of the frequency of operation of described electroacoustics transducer (3), the resonant frequency of hemi-closure space structure (6) and concave curved surface (5) focused sound waves is equal.
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Cited By (8)
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| CN106597450A (en) * | 2016-12-09 | 2017-04-26 | 中国科学院电子学研究所 | Sound detection and positioning system |
| CN107492370A (en) * | 2017-07-31 | 2017-12-19 | 北京交通大学 | The super surface texture that a kind of adjustable sound wave focuses on |
| CN108405292A (en) * | 2018-03-01 | 2018-08-17 | 西安电子科技大学 | Ultrasonic transducer and its manufacturing method are peeped in a kind of focusing |
| CN109939914A (en) * | 2017-12-20 | 2019-06-28 | 深圳先进技术研究院 | A kind of composite material physics focused transducer and its manufacturing method |
| CN110501064A (en) * | 2019-09-05 | 2019-11-26 | 西北大学 | A kind of reflective sound wave focus device for no diaphragm-vibrating type optics sonic sensor |
| CN110560348A (en) * | 2019-08-14 | 2019-12-13 | 武汉大学 | MEMS piezoelectric ultrasonic transducer with hole array Helmholtz resonant cavity |
| CN111477208A (en) * | 2020-04-17 | 2020-07-31 | 丁志军 | Waveguide device and acoustic wave transmission apparatus |
| CN113630686A (en) * | 2021-08-13 | 2021-11-09 | 南京工程学院 | High-strength Helmholtz sound source design method based on pattern recognition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597450A (en) * | 2016-12-09 | 2017-04-26 | 中国科学院电子学研究所 | Sound detection and positioning system |
| CN106597450B (en) * | 2016-12-09 | 2019-07-30 | 中国科学院电子学研究所 | A kind of acoustic detection and positioning system |
| CN107492370A (en) * | 2017-07-31 | 2017-12-19 | 北京交通大学 | The super surface texture that a kind of adjustable sound wave focuses on |
| CN107492370B (en) * | 2017-07-31 | 2020-11-17 | 北京交通大学 | Super surface structure capable of adjusting sound wave focusing |
| CN109939914A (en) * | 2017-12-20 | 2019-06-28 | 深圳先进技术研究院 | A kind of composite material physics focused transducer and its manufacturing method |
| CN108405292A (en) * | 2018-03-01 | 2018-08-17 | 西安电子科技大学 | Ultrasonic transducer and its manufacturing method are peeped in a kind of focusing |
| CN110560348A (en) * | 2019-08-14 | 2019-12-13 | 武汉大学 | MEMS piezoelectric ultrasonic transducer with hole array Helmholtz resonant cavity |
| CN110560348B (en) * | 2019-08-14 | 2021-01-15 | 武汉大学 | MEMS piezoelectric ultrasonic transducer with hole array Helmholtz resonant cavity |
| CN110501064A (en) * | 2019-09-05 | 2019-11-26 | 西北大学 | A kind of reflective sound wave focus device for no diaphragm-vibrating type optics sonic sensor |
| CN111477208A (en) * | 2020-04-17 | 2020-07-31 | 丁志军 | Waveguide device and acoustic wave transmission apparatus |
| CN111477208B (en) * | 2020-04-17 | 2023-11-03 | 丁志军 | Waveguide device and acoustic wave transmitting apparatus |
| CN113630686A (en) * | 2021-08-13 | 2021-11-09 | 南京工程学院 | High-strength Helmholtz sound source design method based on pattern recognition |
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