CN203643602U - High-sensitivity ultrasonic wave sensor - Google Patents
High-sensitivity ultrasonic wave sensor Download PDFInfo
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- CN203643602U CN203643602U CN201320851063.9U CN201320851063U CN203643602U CN 203643602 U CN203643602 U CN 203643602U CN 201320851063 U CN201320851063 U CN 201320851063U CN 203643602 U CN203643602 U CN 203643602U
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- piezoelectric ceramic
- ceramic piece
- metal shell
- sensitivity
- ultrasonic wave
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- 239000000919 ceramic Substances 0.000 claims abstract description 36
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 27
- 230000035945 sensitivity Effects 0.000 claims abstract description 24
- 230000009467 reduction Effects 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000030279 gene silencing Effects 0.000 abstract 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000002604 ultrasonography Methods 0.000 description 13
- 239000000523 sample Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
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- Transducers For Ultrasonic Waves (AREA)
Abstract
The utility model relates to a high-sensitivity ultrasonic wave sensor applied to vehicle reversing detection. The high-sensitivity ultrasonic wave sensor comprises a metal housing with one end being closed and the other end being open, the metal housing is internally provided with a piezoelectric ceramic piece whose diameter is smaller than 6 mm and thickness is smaller than 0.15 mm, a surface of the piezoelectric ceramic piece is provided with a first electrode layer which forms electrical connection with the metal housing, the other surface is provided with a second electrode layer, and lead terminals electrically connected with the first electrode layer and the second electrode layer, and the ultrasonic wave sensor also comprises a silencing layer covering the piezoelectric ceramic piece, and a shielding layer covering the silencing layer. The overall mass of the piezoelectric ceramic piece is about half of an existing large thick chip, thus under the same driving voltage, the vibration amplitude is greatly increased, the sensitivity is enhanced, and the small thin chip has good compactness, few defects, and a prolonged service life, so that the safety factor of a vehicle can be improved, and the high-sensitivity ultrasonic wave sensor has wide practicability.
Description
Technical field
The utility model relates to a kind of high sensitivity ultrasonic sensor that vehicle backing detects that is applied to.
Background technology
Ultrasonic probe is that ultrasonic sensor is the sensor that utilizes hyperacoustic characteristic to develop.Ultrasound wave is the mechanical wave of a kind of vibration frequency higher than sound wave, and generation of vibration is occurred under the excitation of voltage by transducing wafer, and it has, and frequency is high, wavelength is short, diffraction phenomenon is little, particularly good directionality, can become ray and the features such as direction propagation.Ultrasound wave is very large to the penetrating power of liquid, solid, especially in the opaque solid of sunlight, and its degree of depth of penetrable tens meters.Ultrasound wave is encountered impurity or interphase and can be produced significantly to reflect to form and be reflected into echo, encounters live animal physical efficiency and produces Doppler effect.Therefore ultrasound examination is widely used in the aspects such as industry, national defence, biomedicine.Using ultrasound wave as detection means, must produce ultrasound wave and receive ultrasound wave.The device that completes this function is exactly ultrasonic sensor, is called traditionally ultrasonic transducer or ultrasonic probe.Ultrasonic probe is mainly made up of piezoelectric chip, both can launch ultrasound wave, also can receive ultrasound wave.
Reversing is sensitivity by an important performance indexes of ultrasonic probe.Sensitivity is the variable quantity of sensor output signal in steady operation situation and the ratio of input variable quantity.Sensitivity can be regarded as enlargement factor, and multiple is larger, and sensitivity is higher.Improve sensitivity, can increase measuring accuracy.Meanwhile, highly sensitive, the safety coefficient in application is also high.
Sensitive element piezoelectric ceramic piece in ultrasonic probe for ripe reversing in the market, the piezoelectric ceramic piece in this kind of sensor belongs to piezoelectricity sheet, and the moderate piezoelectricity sheet of diameter has the weak point of himself.The first, sensor with piezoelectric ceramics adopt more efficiency high roll film or casting molding processes, this technique thickness is larger, film band defect is more, causes ceramic high temperature to burn till rear inner tiny flaw many, affects ceramic overall performance and serviceable life.The second, ultrasonic probe is (driving voltage is more low better) under identical driving voltage, and diameter is larger, and thickness is thicker, and potsherd vibration amplitude is less, and transducer sensitivity is lower.The 3rd, in application process, sometimes for higher sensitivity, can increase driving voltage, can increase like this energy consumption, and the serviceable life that can reduce piezoelectric ceramics, and then affect the permanance of sensor.Diameter is less than 6mm, and it is that a kind of diameter is less that thickness is less than 0.15mm piezoelectric ceramic piece, the piezoelectric element of thinner thickness.
Utility model content
For above-mentioned technical matters, the utility model provides a kind of reasonable in design, long service life, highly sensitive high sensitivity ultrasonic sensor.
Realize the technical solution of the utility model as follows:
High sensitivity ultrasonic sensor, comprise one end sealing, the unlimited metal shell in one end, in metal shell, be provided with diameter and be less than the piezoelectric ceramic piece that 6mm, thickness are less than 0.15mm, one surface of piezoelectric ceramic piece is provided with metal shell and forms the first electrode layer being electrically connected, another surface is provided with the second electrode lay, and the lead terminal being electrically connected with the first electrode layer, the second electrode lay respectively, also comprise the noise reduction layer covering on piezoelectric ceramic piece, cover the screen layer on noise reduction layer.
Adopt such scheme, due to piezoelectric ceramic piece little Bao, it has very high density, approach solid density, even density, micromechanism homogeneous grain size, ceramic integral performance parameter is compared with same recipe, the large sheet excellence of same process, the oeverall quality of piezoelectric ceramic piece is about the half of existing large sheet, therefore under identical driving voltage, Oscillation Amplitude increases greatly, sensitivity raises, and flakelet good compactness, defect is few, and increase serviceable life, the safety coefficient that can improve like this automobile, practicality is wide.
Further, for performance, sensitivity that sensor entirety has been had, the openend keeping parallelism of the outside surface of described screen layer and metal shell.
Further, described piezoelectric ceramic piece is positioned at metal shell and contacts with diapire, and the diameter of piezoelectric ceramic piece is less than the inside diameter of metal shell.
Further, described metal shell is that aluminum is made.
Further, described metal shell inwall is provided with step surface the filling of conductively-closed layer.
Further, the diameter of described piezoelectric ceramic piece is 4.5mm-5.6mm, and thickness is 0.1mm-0.15mm.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of piezoelectric ceramic piece in the utility model;
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further illustrated.
Referring to Fig. 1,2, high sensitivity ultrasonic sensor, comprise the metal shell 1 that one end sealing, the unlimited alumina based material in one end are made, this structure and size determine that the outside of sensor is used and Installation Modes, the size of bottom surface radiating surface is also by the Ultrasonic Radiation angle of definition sensor simultaneously, and then effective search coverage of definition sensor, therefore, the necessary strict difinition of size herein; In metal shell, be provided with diameter and be less than the piezoelectric ceramic piece 2 that 6mm, thickness are less than 0.15mm, the diameter of concrete piezoelectric ceramic piece is 4.5mm or 5mm or 5.6mm, thickness is 0.1mm or 0.13mm or 0.15mm, piezoelectric ceramic piece is the high frequency oscillator of sensor, it is the vibration source of sensor generation dither, also be the most crucial element of piezoelectric transducer, its integrated performance index has decisive action sensitivity, aftershock, the serviceable life to sensor; One surface of piezoelectric ceramic piece is provided with the first electrode layer 3 made from the ag material of metal shell formation electric connection, another surface is provided with silver the second electrode lay 4, and the lead terminal 5 being electrically connected with the first electrode layer, the second electrode lay respectively, in the time of working sensor, thereby outside driving causes piezoelectric ceramic piece to drive the aluminum enclosure vibration that bends to produce ultrasonic signal, piezoelectricity flakelet, because of quality light, therefore amplitude is large, highly sensitive.Also comprise the noise reduction layer 6 covering on piezoelectric ceramic piece, the main damping sound absorption function that rises, after the work of piezoelectric ceramic piece generation high-frequency vibration, can send ultrasound wave to radiating surface (aluminium outer casing bottom) direction, realize the function of detection range, but also can produce ultrasonic signal to inverse direction simultaneously, for the ultrasound wave not disturbing and affect radiating surface aspect is normally worked, this part ultrasound wave must be eliminated, this element quieter material will radiation-absorbing face reverse side ultrasound wave, guarantee that the normal range finding of sensor is not disturbed.Cover the screen layer 7 on noise reduction layer, this shielding material can be realized sensor water-proof, protection against the tide, dustproof effect; The openend keeping parallelism of the outside surface of screen layer and metal shell.Piezoelectric ceramic piece is positioned at metal shell and contacts with diapire, and the diameter of piezoelectric ceramic piece is less than the inside diameter of metal shell.Metal shell inwall is provided with step surface 8 and conductively-closed layer is filled, and makes the better combination of screen layer and metal shell, and can perfect shield.
From concrete test data, sensor advantage of the present utility model is described below, the flakelet piezoelectric vibrator diameter phi that this sensor adopts is 5.5mm, and thickness T is 0.14mm, and traditional sheet is that diameter phi is 6mm, the piezoelectric monocrystal sheet that thickness T is 0.2mm.The sensor that 2 kinds of potsherds is assembled into respectively to 58K, measurement sensitivity data are as follows:
Contrast by data can be found out, amplitude increase of the present utility model, and the sensitivity that has obviously improved sensor, makes product have better performance.
It should be pointed out that for the person of ordinary skill of the art at this, not departing under the prerequisite of the utility model creation design, can also make improvement, but these all belong to protection domain of the present utility model.
Claims (6)
1. high sensitivity ultrasonic sensor, it is characterized in that, comprise one end sealing, the unlimited metal shell in one end, in metal shell, be provided with diameter and be less than the piezoelectric ceramic piece that 6mm, thickness are less than 0.15mm, one surface of piezoelectric ceramic piece is provided with metal shell and forms the first electrode layer being electrically connected, another surface is provided with the second electrode lay, and the lead terminal being electrically connected with the first electrode layer, the second electrode lay respectively, also comprise the noise reduction layer covering on piezoelectric ceramic piece, cover the screen layer on noise reduction layer.
2. high sensitivity ultrasonic sensor according to claim 1, is characterized in that, the openend keeping parallelism of the outside surface of described screen layer and metal shell.
3. high sensitivity ultrasonic sensor according to claim 1, is characterized in that, described piezoelectric ceramic piece is positioned at metal shell and contacts with diapire, and the diameter of piezoelectric ceramic piece is less than the inside diameter of metal shell.
4. high sensitivity ultrasonic sensor according to claim 1, is characterized in that, described metal shell is that aluminum is made.
5. high sensitivity ultrasonic sensor according to claim 1, is characterized in that, described metal shell inwall is provided with step surface and conductively-closed layer is filled.
6. high sensitivity ultrasonic sensor according to claim 1, is characterized in that, the diameter of described piezoelectric ceramic piece is 4.5mm-5.6mm, and thickness is 0.1mm-0.15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320851063.9U CN203643602U (en) | 2013-12-20 | 2013-12-20 | High-sensitivity ultrasonic wave sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320851063.9U CN203643602U (en) | 2013-12-20 | 2013-12-20 | High-sensitivity ultrasonic wave sensor |
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| Publication Number | Publication Date |
|---|---|
| CN203643602U true CN203643602U (en) | 2014-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320851063.9U Expired - Lifetime CN203643602U (en) | 2013-12-20 | 2013-12-20 | High-sensitivity ultrasonic wave sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103744075A (en) * | 2013-12-20 | 2014-04-23 | 常州波速传感器有限公司 | Ultrasonic sensor |
| CN106525103A (en) * | 2016-10-27 | 2017-03-22 | 深圳市康通科技有限公司 | Electrode installation structure and method of ultrasonic sensor |
| CN110531367A (en) * | 2019-10-14 | 2019-12-03 | 杭州富阳锐明科技有限公司 | A kind of automobile ultrasonic sensor based on piezoelectric ceramics electricity ratio |
| CN112346065A (en) * | 2020-12-04 | 2021-02-09 | 深圳市多泰吉科技有限公司 | Ultrasonic sensing head and have its radar of backing a car |
-
2013
- 2013-12-20 CN CN201320851063.9U patent/CN203643602U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103744075A (en) * | 2013-12-20 | 2014-04-23 | 常州波速传感器有限公司 | Ultrasonic sensor |
| CN106525103A (en) * | 2016-10-27 | 2017-03-22 | 深圳市康通科技有限公司 | Electrode installation structure and method of ultrasonic sensor |
| CN110531367A (en) * | 2019-10-14 | 2019-12-03 | 杭州富阳锐明科技有限公司 | A kind of automobile ultrasonic sensor based on piezoelectric ceramics electricity ratio |
| CN110531367B (en) * | 2019-10-14 | 2021-10-26 | 浙江博美泰克电子有限公司 | Ultrasonic sensor for automobile based on piezoelectric ceramic power-electricity ratio |
| CN112346065A (en) * | 2020-12-04 | 2021-02-09 | 深圳市多泰吉科技有限公司 | Ultrasonic sensing head and have its radar of backing a car |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: No.39 Xinggang Road, Zhonglou District, Changzhou City, Jiangsu Province 213023 Patentee after: Jiangsu wave speed sensor Co.,Ltd. Address before: Room 706, 178 Yulong South Road, Zhonglou District, Changzhou City, Jiangsu Province 213000 Patentee before: BESTAR SENSORTECH Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210303 Address after: 213022 No. 199 west the Yellow River Road, Xinbei District, Jiangsu, Changzhou Patentee after: BESTAR HOLDING Co.,Ltd. Patentee after: Jiangsu wave speed sensor Co.,Ltd. Address before: No.39 Xinggang Road, Zhonglou District, Changzhou City, Jiangsu Province 213023 Patentee before: Jiangsu wave speed sensor Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140611 |