CN202873061U - Gradual-changing transitional acoustic impedance matching layer - Google Patents
Gradual-changing transitional acoustic impedance matching layer Download PDFInfo
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- CN202873061U CN202873061U CN 201220361625 CN201220361625U CN202873061U CN 202873061 U CN202873061 U CN 202873061U CN 201220361625 CN201220361625 CN 201220361625 CN 201220361625 U CN201220361625 U CN 201220361625U CN 202873061 U CN202873061 U CN 202873061U
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Abstract
The utility model belongs to the field of a sensor, and specifically relates to a gradual-changing transitional acoustic impedance matching layer. The gradual-changing transitional acoustic impedance matching layer comprises a low impedance layer and a high impedance layer, wherein the high impedance layer is connected with a piezoelectric vibration element, and the low impedance layer and the high impedance layer are molded into a whole body. The advantages of the gradual-changing transitional acoustic impedance matching layer are that problems, that a plurality of material layers do not match a plurality of bonding layers and supersonic wave signals are high in energy attenuation since a conventional matching material is processed through multilayer bonding to be a gradient material, are solved; and sensitivity of the sensor is improved.
Description
Technical field
The invention belongs to sensor field, specifically a kind of gradual transition acoustic impedance matching layer.
Background technology
Along with the progress of modern society, industry, science and technology, the electronics communication progressively realizes intellectuality, and the development of Internet of Things is new chapter in country's 12 planning, and the transducer primary device that is Internet of Things, and gradual change acoustic impedance matching materials of the present invention is the to external world pith of perceptual performance of transducer, determining that perceptual signal is strong and weak, except Internet of Things, also be applied to industrial high fine positioning, smoke detection, material level, the liquid level test belongs to the acoustical material industry.This material occupy between transducer vibrating elements and the air contact-making surface, the mechanical oscillation transfer of ultrasonic energy that vibrating elements is produced is in air, simultaneously when vibrating ul-trasonic irradiation in this matching materials, again vibrational energy is transferred to resonator device, in this energy transport, require energy loss will reach minimum (or energy absorption is minimum), reach most important parameter acoustic impedance Z coupling in the acoustics, present acoustic impedance material mainly contains two kinds: a kind of use metal material, directly be connected with Piezodectric vibration device, a kind of matching materials that adopts different acoustic impedances is bonded together and consists of the gradient acoustic impedance material and be connected with Piezodectric vibration device.Metal material is only suitable for using in the common transducer of tens KHz as impedance matching layer, be unsuitable for using high frequency sensor, and conventional method is used the different acoustic impedance materials formation functionally gradient material (FGM) that is bonded together, though can accomplish high-frequency, but because material belongs to laminated, although the variation of impedance played impedance and gradually changed between layers in the acoustic wave energy transmission course, but between layers to significantly decay of acoustic wave energy existence (the sensitivity decay is large), so that the signal of sensing emission or reception can not effectively transmit.Conventional acoustic impedance matching materials such as figure one, use metal material as the matching layer between piezoelectric vibration device and air, the vibration ultrasonic signal of piezoelectric element is coupled in the air by sheet metal, again the ultrasonic vibratory energy that returns in the air is transferred to piezoelectric element, its operating frequency of this kind structure transducer can only be accomplished below the 70KHz, for high-frequency, the size of metal matching element need change, so that too large to the ultrasonic signal decay at high band, so that receiving sensitivity is low, this kind material solution should not be as the above high frequency sensor of 100K.Figure two uses the multi-gradient impedance material, the matching layer acoustic impedance is occupy between the acoustic impedance of piezoelectric vibration device 1 and air, its impedance relationship: piezoelectric element 1〉A1〉A2〉A3〉A4〉air dielectric, the A4 acoustic impedance is close to the acoustic impedance of air, the acoustic impedance of A1 is close to the acoustic impedance of piezoelectric vibration device, its process is utilized resin-bonding with different impedance materials, as shown in the figure a1, a2, a3.Although can make the acoustic impedance ladder transition, by the Low ESR of reducing near the piezoelectric vibration device high impedance near air, ultrasonic energy through a plurality of resin beds, carries out a large amount of absorptions and decay to ultrasonic energy in transmission course, cause product sensitivity low.
Summary of the invention
The problem to be solved in the present invention is how to provide energy loss little and can reach most important parameter acoustic reactance Z coupling, the invention provides a kind of gradual transition acoustic impedance matching layer.
The invention provides following technical scheme:
Gradual transition acoustic impedance matching layer, it comprises low impedance layers and high impedance layer, wherein high impedance layer connects piezoelectric vibration device, the integrally manufactured moulding of low impedance layers and high impedance layer.
This gradual transition acoustic impedance matching layer makes by the following method,
Choosing of step 1, material chosen inserts, resin and coupling agent, and wherein, inserts density is at 0.01g/cm
3-1g/cm
3, compression strength is at 1MPa-30MP, resin proportion 1.12g/cm
3, viscosity 3000-15000mpa.s, coupling agent are the amino silane coupler;
Step 2, material mixture ratio carry out proportioning with inserts, resin and the coupling agent of step 1, and ratio is inserts: resin: coupling agent=0.5:1:0.015;
Step 3, vacuumize stirring, put into stirred vessel after the material in the step 2 is configured in proportion, container is inserted in the de-airing mixer stir, stir and open simultaneously vacuum pump, take out the air in the composite material, stirred 10 minutes;
Step 4, curing are put into baking oven with the material that stirs in the step 4 and are solidified, and solidify to adopt step temperature to solidify: the first ladder section, 40 ℃, 4-6 hour; The second-order bench, 60 ℃, 6-10 hour; The 3rd ladder section, 80 ℃, 6-10 hour; The quadravalence bench, 12-24 hour, then forms gradual transition acoustic impedance matching materials by 100 ℃.
The advantage of this technology mode is, adopt step temperature curing to make the viscosity of resin first by thick thinning, this process packing material is according to the different sedimentary deposit of the different formation of density, the past floating that density is little, what relative density was large sinks, between layers without obvious boundary, so that inner different densities material forms different acoustic impedance layers, mode transition with gradual change, material and piezoelectric vibration device after solidifying is bonding, be assembled into required transducer, piezoelectric vibration device is by applying voltage, make piezoelectric element, produce ultrasonic wave, ultrasonic wave is transferred to the low acoustic impedance district by the acoustic impedance district of matching layer, again by the low acoustic impedance district with ultrasound signal transmission in air, the ultrasonic wave that this process is produced by the piezoelectricity acoustic impedance is transferred to the low acoustic impedance district by the acoustic impedance district of matching layer, be transferred to again in the air of low acoustic impedance, when the ultrasonic wave that sends feeds back, the feedback ultrasonic signal is by the Low ESR district of matching layer, be transferred to high resistance regions, be transferred to piezoelectric vibration device by high resistance regions again, piezoelectric vibration device is transferred to subsequent conditioning circuit with this signal.This mode transition with gradual change avoids ultrasonic wave sudden change of acoustic impedance in transmission course to cause the decay of energy, not only effectively solved use single-layer metal material, can not make the defective of high frequency sensor, solved also simultaneously that technique that at present existing matching materials multi-layered bonded forms functionally gradient material (FGM) brings, a plurality of material layers and a plurality of adhesive layer impedance mismatch, the ultrasonic energy signal large problem that decays.Improve the sensitivity of transducer.
Description of drawings
Fig. 1 is a kind of structural representation of prior art;
Fig. 2 is another kind of prior art structural representation;
Fig. 3 is structural representation of the present invention;
Fig. 4 is impedance plot;
Fig. 5 is the sensitivity reflectogram.
Embodiment
As shown in Figure 3, gradual transition acoustic impedance matching layer, it comprises:
Choosing of step 1, material chosen inserts, resin and coupling agent, and wherein, inserts is that inserts density is at 0.01g/cm
3-1g/cm
3, compression strength is at 1MPa-30MP, resin proportion 1.12g/cm
3, viscosity 3000-15000mpa.s, coupling agent are the amino silane coupler;
Step 2, material mixture ratio carry out proportioning with inserts, resin and the coupling agent of step 1, and ratio is inserts: resin: coupling agent=0.5:1:0.015;
Step 3, vacuumize stirring, put into stirred vessel after the material in the step 2 is configured in proportion, container is inserted in the de-airing mixer stir, stir and open simultaneously vacuum pump, take out the air in the composite material, stirred 10 minutes;
Step 4, curing are put into baking oven with the material that stirs in the step 4 and are solidified, and solidify to adopt step temperature to solidify: the first ladder section, 40 ℃, 4-6 hour; The second-order bench, 60 ℃, 6-10 hour; The 3rd ladder section, 80 ℃, 6-10 hour; The quadravalence bench, 12-24 hour, then forms gradual transition acoustic impedance matching materials by 100 ℃.
The present invention is according to principle:
The acoustic impedance of material: Z=p*v
P: the density V of material: the velocity of sound of material
Piezoelectric vibration device acoustic impedance: Z1 is 30*10
6Kg/ (m
2S), as the Ultrasonic Radiation medium empty acoustic impedance be about 400kg/ (m
2S), the acoustic impedance difference of two media is larger, so need to use a kind of acoustic impedance matching materials to be coupled Energy Transfer in this two media.And require for this kind acoustic impedance:
According to following formula: its matching layer acoustic impedance reaches 11*10
4Kg/ (m
2S), aspect scantling, the λ of sound wave/4 are the best transmission effect.
Will satisfy simultaneously two conditions, material need adopt low-density, the low acoustic impedance different specific weight, the material of different hardness, use the resin vacuum stirring to mix, step temperature solidifies, and makes it to form the structure sheaf of different materials, there is not between layers obvious interface, but the variation of gradual change, with the density gradual change of structure sheaf, the velocity of sound is different, acoustic impedance is thereupon gradual change also, finally forms the gradual change shape material that acoustic impedance descending (or ascending) distributes.
The advantage of this technology mode is, adopt step temperature curing to make the viscosity of resin first by thick thinning, this process packing material is according to the different sedimentary deposit of the different formation of density, the past floating that density is little, what relative density was large sinks, between layers without obvious boundary, so that inner different densities material forms different acoustic impedance layers, mode transition with gradual change, material and piezoelectric vibration device after solidifying is bonding, be assembled into required transducer, piezoelectric vibration device 1 is by applying voltage, make piezoelectric element, produce ultrasonic wave, matching layer 11 adopts the inventive method manufacturing to form, ultrasonic wave is transferred to acoustic impedance district 12 in matching layer 11, be transferred to the low acoustic impedance district by acoustic impedance district 12 again, again by low acoustic impedance 13 districts with ultrasound signal transmission in air, the ultrasonic wave that this process is produced by the piezoelectricity acoustic impedance is transferred to low acoustic impedance district 13 by the acoustic impedance district 12 of matching layer, be transferred to again in the air of low acoustic impedance 13, when the ultrasonic wave that sends feeds back, the feedback ultrasonic signal is by the Low ESR district 13 in the matching layer 11, be transferred to high resistance regions 12, be transferred to piezoelectric vibration device 1 by high resistance regions 12 again, piezoelectric vibration device 1 is transferred to subsequent conditioning circuit with this signal.This mode transition with gradual change avoids ultrasonic wave sudden change of acoustic impedance in transmission course to cause the decay of energy, not only effectively solved use single-layer metal material, can not make the defective of high frequency sensor, solved also simultaneously that technique that at present existing matching materials multi-layered bonded forms functionally gradient material (FGM) brings, a plurality of material layers and a plurality of adhesive layer impedance mismatch, the ultrasonic energy signal large problem that decays.Improve the sensitivity of transducer.
Fig. 4 is: impedance plot, wherein represented phase curve 3 and impedance curve 2, and after this transducer uses this invention impedance matching as can be seen from Figure, obtain linear impedance curve, the linearity is fine, illustrates that the acoustic impedance matching effect is fine, and sensitivity is also higher.
Fig. 5: sensitivity echo, apply driving voltage to transducer, transducer sends ultrasonic wave to air, feedback wave acts on transducer when running into barrier, when for barrier fixedly the time, the signal of feedback wave is stronger, shows as echo voltage higher, this figure is expressed as the signal strength signal intensity of feedback wave, represents with the form of voltage.
Claims (1)
1. gradual transition acoustic impedance matching layer, it comprises low impedance layers and high impedance layer, wherein high impedance layer connects piezoelectric vibration device, the integrally manufactured moulding of low impedance layers and high impedance layer.
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|---|---|---|---|
| CN 201220361625 CN202873061U (en) | 2012-07-24 | 2012-07-24 | Gradual-changing transitional acoustic impedance matching layer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105381943A (en) * | 2015-10-14 | 2016-03-09 | 深圳市理邦精密仪器股份有限公司 | Ultrasonic transducer, gradual-change sound impedance matching layer and manufacturing method of gradual-change sound impedance matching layer |
| CN107999362A (en) * | 2016-11-01 | 2018-05-08 | 深圳市理邦精密仪器股份有限公司 | The production method of matching layer |
| CN109246575A (en) * | 2018-08-09 | 2019-01-18 | 广州联声电子科技有限公司 | A kind of preparation method of the progressive acoustic impedance matching layer of high frequency |
| CN110849463A (en) * | 2019-10-24 | 2020-02-28 | 武汉理工大学 | Underwater sound sensing optical cable and sensitivity enhancing coating method thereof |
| CN111447535A (en) * | 2020-03-20 | 2020-07-24 | 中国科学院声学研究所 | Gradient-adjustable acoustic impedance matching layer |
| CN112040382A (en) * | 2020-08-10 | 2020-12-04 | 上海船舶电子设备研究所(中国船舶重工集团公司第七二六研究所) | High-bandwidth underwater acoustic transducer based on acoustic impedance gradient matching layer |
| CN112176527A (en) * | 2020-09-30 | 2021-01-05 | 福州大学 | Antibacterial antistatic flame-retardant polyester fiber gradient structure sound-absorbing material and preparation method thereof |
-
2012
- 2012-07-24 CN CN 201220361625 patent/CN202873061U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105381943A (en) * | 2015-10-14 | 2016-03-09 | 深圳市理邦精密仪器股份有限公司 | Ultrasonic transducer, gradual-change sound impedance matching layer and manufacturing method of gradual-change sound impedance matching layer |
| CN105381943B (en) * | 2015-10-14 | 2018-02-09 | 深圳市理邦精密仪器股份有限公司 | Ultrasonic transducer, gradual change acoustic impedance matching layer and preparation method thereof |
| CN107999362A (en) * | 2016-11-01 | 2018-05-08 | 深圳市理邦精密仪器股份有限公司 | The production method of matching layer |
| CN109246575A (en) * | 2018-08-09 | 2019-01-18 | 广州联声电子科技有限公司 | A kind of preparation method of the progressive acoustic impedance matching layer of high frequency |
| CN109246575B (en) * | 2018-08-09 | 2020-10-16 | 广州联声电子科技有限公司 | Preparation method of high-frequency progressive acoustic impedance matching layer |
| CN110849463A (en) * | 2019-10-24 | 2020-02-28 | 武汉理工大学 | Underwater sound sensing optical cable and sensitivity enhancing coating method thereof |
| CN110849463B (en) * | 2019-10-24 | 2021-11-12 | 武汉理工大学 | Underwater sound sensing optical cable and sensitivity enhancing coating method thereof |
| CN111447535A (en) * | 2020-03-20 | 2020-07-24 | 中国科学院声学研究所 | Gradient-adjustable acoustic impedance matching layer |
| CN111447535B (en) * | 2020-03-20 | 2021-02-09 | 中国科学院声学研究所 | Gradient-adjustable acoustic impedance matching layer |
| CN112040382A (en) * | 2020-08-10 | 2020-12-04 | 上海船舶电子设备研究所(中国船舶重工集团公司第七二六研究所) | High-bandwidth underwater acoustic transducer based on acoustic impedance gradient matching layer |
| CN112040382B (en) * | 2020-08-10 | 2021-07-30 | 上海船舶电子设备研究所(中国船舶重工集团公司第七二六研究所) | High-bandwidth underwater acoustic transducer based on acoustic impedance gradient matching layer |
| CN112176527A (en) * | 2020-09-30 | 2021-01-05 | 福州大学 | Antibacterial antistatic flame-retardant polyester fiber gradient structure sound-absorbing material and preparation method thereof |
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Granted publication date: 20130410 |