CN105158729A - Sound source directional sensing device with deep sub-wavelength size - Google Patents
Sound source directional sensing device with deep sub-wavelength size Download PDFInfo
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- CN105158729A CN105158729A CN201510623734.XA CN201510623734A CN105158729A CN 105158729 A CN105158729 A CN 105158729A CN 201510623734 A CN201510623734 A CN 201510623734A CN 105158729 A CN105158729 A CN 105158729A
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- source direction
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- 239000002184 metal Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 238000009827 uniform distribution Methods 0.000 claims description 2
- 230000003993 interaction Effects 0.000 abstract description 3
- 239000011258 core-shell material Substances 0.000 abstract 2
- 238000005259 measurement Methods 0.000 description 3
- 230000005404 monopole Effects 0.000 description 3
- 238000010606 normalization Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/78—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using electromagnetic waves other than radio waves
- G01S3/781—Details
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
The invention discloses a sound source directional sensing device with deep sub-wavelength size. The sensing device is of a core-shell structure, the core is a rigid core, the shell is an acoustic super surface, a microphone is installed at the core-shell interface, the acoustic super surface comprises a plurality of folding slots distributed uniformly on the circumference, the folding slots are opened at one end away from the core and closed at the other end close to the core, and a ray defined by the center of the core and the center of the microphone penetrates through one of the openings by using the center of the core as a starting point. A bipolar morphology echo wall resonance mode formed under the interaction of the closed acoustic super surface and the incident plane wave intensity is skillfully utilized in the sound source directional sensing device with deep sub-wavelength size, so that a far-field sound source can be accurately and sensitively directed, and the sensing device does not produce obvious interference to the measured sound field and can form effective concealed protection.
Description
Technical field
The present invention relates to a kind of acoustic sensor, be specifically related to a kind of dark sub-wavelength dimensions sound source direction senser element.
Background technology
Traditional sound source direction equipment, as vector sensor part and array sensing device, utilizes Particle Vibration Velocity in medium to measure and multimetering respectively, realizes far field sound source direction.These equipment have important application in sonar field.Such as detect the direction of sounding aircraft in aerial sounding aircraft or water.Such as vector microphone principle is comparatively complicated, not only needs to measure acoustic pressure size, also needs to measure Particle Vibration Velocity in medium further, thus expensive; Array sensing device build is huge, and need calibration, sensing equipment is easily found by the other side's sonar.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art; the invention provides a kind of dark sub-wavelength dimensions sound source direction senser element; utilize under closing the super surperficial and incident plane wave strong interaction of acoustics and form dipole pattern Echo Wall resonance mode; not only realize the accurate sensitive orientation of far field sound source; and obvious interference is not produced to measurement sound field, form effective stealthy protection.
Technical scheme: for solving the problems of the technologies described above, one of the present invention dark sub-wavelength dimensions sound source direction senser element, described senser element is nucleocapsid structure, core is rigid nuclear, shell is that acoustics is super surperficial, in nucleocapsid interface, mini microphone is installed, described acoustics surpasses the folded slot that surface comprises several circumference uniform distributions, folded slot is away from the one end open of core, close near one end of core, with the center of core for starting point, the determined ray in the center of core and the center of mini microphone is through one of them opening.
As preferably, the super surperficial and acoustic impedance that is rigid nuclear of described acoustics is at least 100 times of background medium acoustic impedance, and rigid nuclear and shell are metal or organic plastics.
As preferably, described folded slot is even number, and folded slot is at least four.
As preferably, in order to reduce the adverse effect of viscous loss to device performance, the width of described folded slot is at least 1mm, but width is less than 1/5 of the corresponding wave length of sound of senser element frequency of operation, ensure that sound wave higher order mode component in rectangular channel is in degree of depth cut-off state, the frequency of operation ω of senser element
0with the mathematical relation of folded slot L total length be: ω
0=c
0π/(2L), c
0for the velocity of sound in background medium.
As preferably, described opening subtended angle width is less than 1/5 of the corresponding wave length of sound of senser element frequency of operation, ensures that sound wave higher order mode component in rectangular channel is in degree of depth cut-off state.
As preferably, described shell is circular, and the inside radius of shell is 1cm, and the external radius of shell is 3cm, and the height of shell is less than 1/5 of the corresponding wave length of sound of senser element frequency of operation, ensures that sound wave higher order mode component in rectangular channel is in degree of depth cut-off state.
Beneficial effect: dark sub-wavelength dimensions sound source direction senser element of the present invention; make use of dexterously closed acoustics super surperficial with incident plane wave strong interaction under form dipole pattern Echo Wall resonance mode; not only realize the accurate sensitive orientation of far field sound source; and obvious interference is not produced to measurement sound field, form effective stealthy protection.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of the present invention;
Fig. 2 is the size indication figure of an embodiment of the present invention;
Fig. 3 is the acoustic scattering intensity spectrogram of embodiment in Fig. 1;
Fig. 4 is the microphone place acoustics gain spectrogram of embodiment in Fig. 1;
Fig. 5 be in Fig. 1 embodiment in non-inclined situation, upper surface directional response figure planar;
Fig. 6 is embodiment response diagram under differing tilt angles in Fig. 1.
Embodiment
As shown in Figure 1, dark sub-wavelength dimensions sound source direction senser element of the present invention, be dark sub-wavelength dimensions nucleocapsid structure, core is rigid nuclear 3, and shell is acoustics super surperficial 2.Be integrated with a mini microphone 1 in core, its acoustical signal receiving plane is close to acoustics super surperficial 2 and rigid nuclear 3 interface.Acoustics surpasses surface crust 2, comprises the folded slot 4 of four equidistant arrangements, and folded slot 4, away from the one end open of core 3, is closed near one end of core 3, and the center of mini microphone 1 and the determined straight line in center of core 3 are wherein in an opening.As shown in Figure 2, described acoustics surpasses surface crust inside radius R
1=1 centimetre, external radius R
2=3 centimetres, the width of each groove is 1.5 millimeters, and opening part subtended angle θ=6 °, total length is for being about L=12 centimetre.The folding mode of groove can be diversified, and Fig. 2 is wherein a kind of.According to pattern matching method, the pass that we can obtain frequency of operation and single folded slot total length is: ω
0=c
0π/(2L), wherein, c
0for the velocity of sound in background medium.According to relational expression, we obtain the aerial frequency of operation of this specific embodiment and should be near 700Hz, and wavelength is about 0.49m.Above-mentioned rigid nuclear 3 and the super acoustic impedance of surperficial 2 of acoustics are at least 100 times of background medium acoustic impedance, are metal or organic plastics.As shown in Figure 2, wave length of sound is about device size D=2R
2octuple, can adjust accordingly according to actual.
As shown in Figure 3, scattering strength spectrogram shows this embodiment (solid line sign frequency location) near frequency of operation 700Hz and produces dipole pattern Echo Wall resonance peak A (normalization scattering strength is decided to be 1) significantly having directive property.Meanwhile, non-direction monopole pattern Whispering-gallery-mode B (dotted line sign frequency location) is strongly inhibited, and its normalization scattering strength is about 0.014.Excite because the incidence of single plane ripple belongs to asymmetric, thus more easily inspire dipole pattern Whispering-gallery-mode A, and be not easy to inspire monopole pattern Whispering-gallery-mode B.Non-direction monopole pattern Whispering-gallery-mode B needs two bundles same-phase plane wave incident in opposite directions to excite, uncommon in reality.
As shown in Fig. 4 illustration, when incident plane wave is along just importing sound source direction senser element (setting now deflection is 0 °) into the direction of microphone 1 place channel opening, the acoustics gain of the incident wave of different frequency is different.Fig. 4 shows under Echo Wall resonant condition, and in embodiment, microphone 1 Received signal strength is occur more than 10 times acoustics gains near 695Hz in incident wave frequency.In Fig. 4, solid line is analog result; Circles mark is experimental result.
As shown in Figure 5, this embodiment planar has very strong direction recognition performance.Wherein, far field sound source and embodiment upper surface are in same plane, and embodiment is cylindrical device, as shown in Figure 2.When deflection is 0 °, namely incident wave and microphone 1 place channel opening normal (the sensing center of circle) are in 0 ° of angle, and now folded slot 4 opening at microphone 1 place is just to far field sound source.As shown in Figure 4, planar whir source orientation senser element, as shown in Figure 5, it is 0 ° that the Received signal strength maximum value of experiment measuring corresponds to deflection to the normalization acoustic pressure that microphone 1 receives.Therefore, when far field sound source and embodiment upper surface are in same plane, our rotary embodiment, when Received signal strength reaches maximum value, folded slot 4 opening at microphone 1 place is towards being far field Sounnd source direction.
As shown in Figure 6, also there is very strong directional perception performance in this embodiment under tilt condition.Wherein, pitch angle is worked as
when being 0 °, namely far field sound source and embodiment upper surface are in same plane.Under embodiment tilt condition, as shown in Figure 6, when sound source direction senser element angle of inclination is 0 °, acoustics gain is maximum, and namely the Received signal strength maximum value of experiment measuring corresponds to pitch angle is 0 °.Therefore, when far field sound source and embodiment upper surface are not in same plane, we tilt embodiment, and when Received signal strength reaches maximum value, far field sound source and embodiment upper surface are then in same plane.
Described in comprehensive, we obtain a kind of method determining any point far field Sounnd source direction in three dimensions.First, we tilt sound source direction senser element, pitch angle
you – 90 ° to+90 °.When Received signal strength reaches maximum value, far field sound source and embodiment upper surface are then in same plane.Then, our rotary embodiment, when Received signal strength reaches maximum value, folded slot 4 opening at microphone 1 place is towards being far field Sounnd source direction.After determining Sounnd source direction, particular location can be determined further in conjunction with other means such as echo rangings.
Last due to embodiment size (discoid device diameters D=2R
2) be about 1/8 of incident wavelength, according to the diffraction effect of ripple, this embodiment does not produce obvious interference to measurement sound field, forms effective stealthy protection.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a dark sub-wavelength dimensions sound source direction senser element, it is characterized in that: described senser element is nucleocapsid structure, core is rigid nuclear, shell is that acoustics is super surperficial, and be provided with mini microphone in nucleocapsid interface, described acoustics surpasses the folded slot that surface comprises several circumference uniform distributions, folded slot is away from the one end open of core, close near one end of core, with the center of core for starting point, the determined ray in the center of core and the center of mini microphone is through one of them opening.
2. dark sub-wavelength dimensions sound source direction senser element according to claim 1, is characterized in that: the super surperficial and acoustic impedance that is rigid nuclear of described acoustics is at least 100 times of background medium acoustic impedance, and rigid nuclear and shell are metal or organic plastics.
3. dark sub-wavelength dimensions sound source direction senser element according to claim 1, is characterized in that: described folded slot is even number, and folded slot is at least four.
4. the dark sub-wavelength dimensions sound source direction senser element according to claim 1 or 3, is characterized in that: the width of described folded slot is at least 1mm, but is less than 1/5, the frequency of operation ω of senser element of the corresponding wave length of sound of senser element frequency of operation
0with the mathematical relation of folded slot total length L be: ω
0=c
0π/(2L), c
0for the velocity of sound in background medium.
5. dark sub-wavelength dimensions sound source direction senser element according to claim 4, is characterized in that: the subtended angle width of described opening is less than 1/5 of the corresponding wave length of sound of senser element frequency of operation.
6. dark sub-wavelength dimensions sound source direction senser element according to claim 5, is characterized in that: described shell is circular, and the inside radius of shell is 1cm, and the external radius of shell is 3cm, and the height of shell is less than 1/5 of the corresponding wave length of sound of senser element frequency of operation.
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| CN201510623734.XA CN105158729B (en) | 2015-09-25 | 2015-09-25 | A kind of deep sub-wavelength dimensions sound source direction senser element |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105869620A (en) * | 2016-03-25 | 2016-08-17 | 南京大学 | Broadband and stable multi-arm folded acoustic eddy field transmitter |
| CN108037508A (en) * | 2017-11-28 | 2018-05-15 | 华中科技大学 | A kind of method that sub-wavelength resolution is realized based on patterning tailoring technique |
| CN109994100A (en) * | 2019-04-08 | 2019-07-09 | 广东工业大学 | A kind of sound vortex wave producer surpassing surface texture based on acoustics |
| CN110012397A (en) * | 2019-05-10 | 2019-07-12 | 美特科技(苏州)有限公司 | A kind of loudspeaker |
| CN112254579A (en) * | 2020-10-20 | 2021-01-22 | 天津大学 | Time-domain broadband acoustic carpet type stealth coat and manufacturing method |
| US11064292B2 (en) * | 2016-03-23 | 2021-07-13 | The Yokohama Rubber Co., Ltd. | Acoustic transmission member and method of designing same |
| CN114414028A (en) * | 2022-01-25 | 2022-04-29 | 重庆医科大学 | Device and method for measuring sound velocity of medium in sound wave guide tube based on sub-wavelength scale |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11064292B2 (en) * | 2016-03-23 | 2021-07-13 | The Yokohama Rubber Co., Ltd. | Acoustic transmission member and method of designing same |
| CN105869620A (en) * | 2016-03-25 | 2016-08-17 | 南京大学 | Broadband and stable multi-arm folded acoustic eddy field transmitter |
| CN105869620B (en) * | 2016-03-25 | 2019-05-03 | 南京大学 | A kind of multi-arm folded form acoustics vortex field emission device that wideband is stable |
| CN108037508A (en) * | 2017-11-28 | 2018-05-15 | 华中科技大学 | A kind of method that sub-wavelength resolution is realized based on patterning tailoring technique |
| CN108037508B (en) * | 2017-11-28 | 2019-09-06 | 华中科技大学 | A method of realizing that sub-wavelength is differentiated based on patterning tailoring technique |
| CN109994100A (en) * | 2019-04-08 | 2019-07-09 | 广东工业大学 | A kind of sound vortex wave producer surpassing surface texture based on acoustics |
| CN110012397A (en) * | 2019-05-10 | 2019-07-12 | 美特科技(苏州)有限公司 | A kind of loudspeaker |
| CN112254579A (en) * | 2020-10-20 | 2021-01-22 | 天津大学 | Time-domain broadband acoustic carpet type stealth coat and manufacturing method |
| CN114414028A (en) * | 2022-01-25 | 2022-04-29 | 重庆医科大学 | Device and method for measuring sound velocity of medium in sound wave guide tube based on sub-wavelength scale |
| CN114414028B (en) * | 2022-01-25 | 2023-11-24 | 重庆医科大学 | Device and method for measuring sound velocity of medium in sound waveguide tube based on sub-wavelength scale |
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| CN105158729B (en) | 2017-12-19 |
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