CN100424485C - Pulsating pressure sensor - Google Patents
Pulsating pressure sensor Download PDFInfo
- Publication number
- CN100424485C CN100424485C CNB2006101141676A CN200610114167A CN100424485C CN 100424485 C CN100424485 C CN 100424485C CN B2006101141676 A CNB2006101141676 A CN B2006101141676A CN 200610114167 A CN200610114167 A CN 200610114167A CN 100424485 C CN100424485 C CN 100424485C
- Authority
- CN
- China
- Prior art keywords
- amplifier
- metal shell
- copper ring
- cover plate
- circuit cover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The present invention provides one kind of pulsating pressure sensor and belongs to the field of piezoelectric pressure sensor. The pulsating pressure sensor includes one tubby metal casing, one circuit covering plate in the top of the casing to form one shielding cavity together with the casing, one sensing element of piezoelectric chip adhered to the inside bottom of the casing and one amplifier with input connected electrically to the signal pole of the piezoelectric chip. When some pulsating pressure is acted onto the bottom of the casing, the piezoelectric chip produces deformation and generates charge, which is amplified and converted into output voltage. The present invention has the features of high sensitivity, high antijamming capacity, small size, low cost and other features, and may be applied widely in detecting heart sound, pulse, vibration, impact, acceleration, etc.
Description
Technical field
The invention belongs to the piezoelectric pressure indicator technical field, relate to a kind of oscillatory pressure pick-up.
Background technology
The sensor that adopts piezoelectric principle to carry out pressure detection has U.S. Pat 6271621B1, and it has provided a kind of PbTiO of using
3/ neoprene compound is made the piezo-electric pressure sensor of cable and two kinds of structures of lamination; China utility model patent 94Z40074 provides and adopts piezoelectric membrane to form detection source, and is installed in two hollow semiellipsoid cavitys that insulating material makes, and is used for the oil pressure of detection of engine; United States Patent (USP) 5852245 provides a kind of high-temp pressure sensor of making of piezoelectric ceramics PZT, is used to detect the pressure in combustion in IC engine chamber.The 628th holdings NZ890978 of research institute of the Ministry of Aero-Space Industry provides with the PVDF piezoelectric membrane and sticks on periphery, measures the dynamic pressure that places low speed opening wind-tunnel periphery.The sensor is all directly exported sensitive signal from piezoelectric transducer, do not add preposition amplification, the output impedance height, and signal disturbs big.
The piezo-electric pressure sensor of another kind of band amplifier has United States Patent (USP) 6159166, provide a kind of pulse pressure sensor that adopts the piezoelectric transducer incorporated amplifier, this sensor construction complexity, narrow 0.1Hz～the 250Hz of the frequency response range of amplifier only is suitable for detecting the dynamic pressure of low frequencies such as pulsation.The safe and scientific journal of China (1998 5 phases) has been reported a kind of pressure lever type pressure transducer of novel band amplifier, it adopts piezoelectric ceramics as sensitive element, adopt the structure of band sound absorption rod-type, the built-in voltage amplifier is used for the pressure detection of blast process.This sensor belongs to special test equipment, and purposes is single.
In sum, propose a kind ofly can effectively remove undesired signal, highly sensitive dynamic pressure transducer simple in structure becomes problem demanding prompt solution.
Summary of the invention
The purpose of this invention is to provide a kind of oscillatory pressure pick-up, this sensor has highly sensitive and the strong characteristics of antijamming capability.
Above-mentioned purpose of the present invention is achieved by the following technical solutions:
A kind of oscillatory pressure pick-up, comprise a metal shell, this metal shell is a tubbiness, one circuit cover plate is set at the top of metal shell, circuit cover plate and metal shell are formed a shielding cavity, sensitive element and amplifier are set in shielding cavity, and sensitive element sticks on the metal shell bottom by piezoelectric patches and constitutes, and the pickup electrode of piezoelectric patches is connected with amp.in.
Amplifier weldering is attached to the circuit cover inner surface, is communicated with the ground end of amplifier by the circuit cover plate as the metal shell in piezoelectric patches earth polar.In inside of metal outershell one copper ring is set, between copper ring and the metal shell insulator is set, an end of copper ring and the signal wire crimping of circuit cover plate also are connected to amplifier input terminal, and the other end of copper ring is connected with the signal wire that the pickup electrode of piezoelectric patches is drawn.Described insulator comprises insulating washer and plastic hoop, and insulating washer is arranged on the bottom of copper ring, and plastic hoop is arranged on the lateral wall of copper ring.
Thickness by the piezoelectric patches of piezoelectric ceramics, piezopolymer or piezo-electricity composite material preparation is 10-1000um.
Amplifier is the charge amplifier or the field-effect amplifier of a high input low output impedance.
Betal can adopt soft alloy or metal alloy compositions such as copper, aluminium.
The alloy metal material that copper ring can adopt zinc Mock gold material or other to be easy to weld.
The output pin of amplifier and ground pin are drawn by the via hole of circuit cover plate, and the output terminal of amplifier can be connected to capacitance.
Oscillatory pressure pick-up of the present invention has the following advantages:
One, highly sensitive.The piezoelectric patches inside surface of sensor sensing element does not stress, but free vibration under external force produces bigger deformation and electric charge then.Built-in amplifier amplifies electric charge, and output higher voltage signal.
Two, antijamming capability is strong.Whole sensor is encapsulated in the shielding cavity, can eliminate external interference.In addition, the built-in amplifier of sensor is a high input impedance amplifier, has suppressed the influence of load and arrangement of conductors electric capacity effectively.
Three, sensor is simple in structure, and built-in amplifier is an integrated amplifier, and cost of manufacture is low.
Description of drawings
Fig. 1 is an oscillatory pressure pick-up structural representation of the present invention;
Fig. 2 is a sensitive element structural representation of the present invention;
Fig. 3 is a dynamic pressure transducer working circuit diagram of the present invention;
Fig. 4 is a plastic hoop rod structure synoptic diagram of the present invention;
Fig. 5 is a copper ring rod structure synoptic diagram of the present invention;
Fig. 6 is a cover plate circuit layout card of the present invention; Wherein, Fig. 6-a is the outside surface of circuit cover plate; Fig. 6-b is the inside surface of circuit cover plate;
Fig. 7 is an insulating washer structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
As shown in Figure 1, dynamic pressure transducer comprises metal shell 1, piezoelectric patches 4, plastic hoop 2, copper ring 3, insulating washer 5, amplifier 7 and circuit cover plate 6.Shell 1 is the drum structure of metal material.The diameter of piezoelectric patches 4 is less than the diameter of metal shell, and sticks on the bottom of shell 1 with one heart.Piezoelectric patches and metal shell constitute sensitive element jointly.Also placed the insulating washer 5 of annular in the bottom of shell.On insulating washer, placed the plastic hoop 2 of tubular with one heart near outer casing inner wall.Outside the plastics annulated column, on the insulating washer, place the copper ring 3 of tubular again with one heart, on copper ring, placed circuit cover plate 6.The bottom crimping of copper ring post the signal wire 9 of piezoelectric patches.Pasted prime amplifier 7 at the inside surface of cover plate.The shell flanging, form enclosed construction at last.
Sensitive element as shown in Figure 2, piezoelectric patches 4 sticks on tubbiness betal can 1 bottom, betal can should be chosen metal or metal alloy such as soft alloy such as copper, aluminium and make.So that produce than large deformation under pressure.The piezoelectric patches surface is provided with signal electrode, be connected to soft lead-in wire 9 on it, the surface is in free state, with abundant realization free bend vibration, lead-in wire is connected to the copper ring post, and being connected to amplifier input terminal, pressure affacts the betal can bottom, the moving piezoelectric patches distortion of shell tail band, produce deformation, then produce electric charge, amplify through amplifier again, and convert voltage signal output to.Betal can is the zinc platinoid in the present embodiment, thickness 0.2mm～0.4mm, and piezoelectric patches is manufactured with piezoelectric ceramics, thick 50 μ m～0.2mm.
The diameter of sensitive element piezoelectric patches should be less than the betal can diameter, and leaves the rigging position of insulating washer.Betal can is communicated with the grounding leg 7b of amplifier as the earthing pole of element, forms a shield loop, can effectively extract tiny signal, removes other interference.
Amplifier among Fig. 1 should use the integrated amplifier of high input low output impedance, and the present embodiment is selected LMV1012 series amplifier chip for use.The operating circuit of sensor as shown in Figure 3.Wherein the input impedance of field effect transistor is greater than 100M Ω, and output impedance is less than 200 Ω, frequency range 10Hz～100kHz, and supply voltage 2～5V, resistance R is an adjustable resistance, range of adjustment: 2k Ω～15k Ω.
Plastic hoop and copper ring are shown in Figure 4 and 5, and plastic hoop is coated at copper ring, and to isolate shell and copper ring, copper ring is higher than plastic hoop, so the sensor cavity is supported by copper ring.Wiring diagram on the circuit cover plate as shown in Figure 6, oblique line partly is furnished with conductive layer.The output pin 7a of amplifier draws by the via hole 8a of cover plate, and ground pin 7b draws by via hole 8b.Shell coboundary volume cover clamp outer rim conductive layer makes the ground end of amplifier be communicated with shell, and the output terminal of amplifier is connected to capacitance, to reject direct current signal.Regulate resistance R scalable output sensitivity.
In sum, the invention discloses a kind of oscillatory pressure pick-up.Above-described application scenarios and embodiment are not to be used to limit the present invention, and any those skilled in the art without departing from the spirit and scope of the present invention, can do various changes and retouching, so protection scope of the present invention is looked the claim scope and defined.
Claims (7)
1. oscillatory pressure pick-up, comprise a metal shell, this metal shell is a tubbiness, it is characterized in that: the circuit cover plate is set at the top of metal shell, metal shell is by the ground wire crimping of flanging and circuit cover plate, the amplifier weldering is attached to the circuit cover inner surface, metal shell as the piezoelectric patches earth polar is communicated with the ground end of amplifier by the circuit cover plate, make metal shell and circuit cover plate constitute a shielding cavity, sensitive element and amplifier are set in shielding cavity, sensitive element sticks on the metal shell bottom by piezoelectric patches and constitutes, in inside of metal outershell one copper ring is set, between copper ring and the metal shell insulator is set, one end of copper ring and the signal wire crimping of circuit cover plate also are connected to amplifier input terminal, the other end of copper ring is connected with the signal wire that the pickup electrode of piezoelectric patches is drawn, and the signal electrode of piezoelectric patches is connected with amp.in.
2. oscillatory pressure pick-up as claimed in claim 1 is characterized in that: the thickness by the piezoelectric patches of piezoelectric ceramics, piezopolymer or piezo-electricity composite material preparation is 10-1000um.
3. oscillatory pressure pick-up as claimed in claim 1 is characterized in that: amplifier is the charge amplifier or the field-effect amplifier of a high input low output impedance.
4. oscillatory pressure pick-up as claimed in claim 1 is characterized in that: described insulator comprises insulating washer and plastic hoop, and insulating washer is arranged on the bottom of copper ring, and plastic hoop is arranged on the lateral wall of copper ring.
5. oscillatory pressure pick-up as claimed in claim 1 is characterized in that: betal can adopts copper, aluminium or zinc Mock gold material.
6. oscillatory pressure pick-up as claimed in claim 1 is characterized in that: the output pin of amplifier and ground pin are drawn by the via hole of circuit cover plate.
7. oscillatory pressure pick-up as claimed in claim 1 is characterized in that: copper ring adopts zinc Mock gold material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101141676A CN100424485C (en) | 2006-10-31 | 2006-10-31 | Pulsating pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101141676A CN100424485C (en) | 2006-10-31 | 2006-10-31 | Pulsating pressure sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1945248A CN1945248A (en) | 2007-04-11 |
| CN100424485C true CN100424485C (en) | 2008-10-08 |
Family
ID=38044747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101141676A Expired - Fee Related CN100424485C (en) | 2006-10-31 | 2006-10-31 | Pulsating pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100424485C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008043175A1 (en) * | 2008-10-24 | 2010-04-29 | Endress + Hauser Gmbh + Co. Kg | Relative pressure sensor |
| CN102384715B (en) * | 2011-02-15 | 2015-12-30 | 谭成忠 | A kind of piezoelectric current sensor |
| CN103431848B (en) * | 2013-09-22 | 2015-10-21 | 天津普仁万合信息技术有限公司 | A kind of Portable passive sensor |
| CN104000566B (en) * | 2014-06-09 | 2015-10-28 | 宁波瑞诺医疗科技有限公司 | Pulse detecting device and detection method thereof |
| CN104127176A (en) * | 2014-06-26 | 2014-11-05 | 北京信息科技大学 | Portable blood pressure and pulse measuring instrument without inflation pump structure |
| CN105571766A (en) * | 2014-10-11 | 2016-05-11 | 中国航空工业集团公司西安飞机设计研究所 | Surface pressure testing device for wind tunnel model |
| JP6578184B2 (en) * | 2015-10-16 | 2019-09-18 | 本田技研工業株式会社 | In-cylinder pressure detector |
| CN105662424A (en) * | 2016-03-31 | 2016-06-15 | 德清县德意电脑有限公司 | Improved-structure ballistocardiogram signal recorder |
| CN107389253A (en) * | 2017-06-30 | 2017-11-24 | 南京理工大学 | Embedded dynamically pressure testing instrument |
| CN110686806A (en) * | 2019-11-07 | 2020-01-14 | 徐州陀微传感科技有限公司 | Pressure sensor and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4373397A (en) * | 1980-02-06 | 1983-02-15 | Keller Hans W | Piezoresistive pressure cell |
| CN1158415A (en) * | 1996-02-26 | 1997-09-03 | 三星电子株式会社 | Vibration detecting sensor |
| CN2292519Y (en) * | 1996-12-25 | 1998-09-30 | 中国科学院长春应用化学研究所 | Direct pressure pulsing sensor |
| JP2001065461A (en) * | 1999-08-26 | 2001-03-16 | Matsushita Electric Works Ltd | Piezoelectric diaphragm pump, sphygmomanometer using the diaphragm pump, and manufacturing method of the diaphragm pump |
| CN1419895A (en) * | 2001-11-16 | 2003-05-28 | 精工电子有限公司 | Piezoelectric sensor, method for mfg. same, and pulse wave detector |
-
2006
- 2006-10-31 CN CNB2006101141676A patent/CN100424485C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4373397A (en) * | 1980-02-06 | 1983-02-15 | Keller Hans W | Piezoresistive pressure cell |
| CN1158415A (en) * | 1996-02-26 | 1997-09-03 | 三星电子株式会社 | Vibration detecting sensor |
| CN2292519Y (en) * | 1996-12-25 | 1998-09-30 | 中国科学院长春应用化学研究所 | Direct pressure pulsing sensor |
| JP2001065461A (en) * | 1999-08-26 | 2001-03-16 | Matsushita Electric Works Ltd | Piezoelectric diaphragm pump, sphygmomanometer using the diaphragm pump, and manufacturing method of the diaphragm pump |
| CN1419895A (en) * | 2001-11-16 | 2003-05-28 | 精工电子有限公司 | Piezoelectric sensor, method for mfg. same, and pulse wave detector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1945248A (en) | 2007-04-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100424485C (en) | Pulsating pressure sensor | |
| JP2012147115A5 (en) | ||
| US10082021B2 (en) | Azimuthally acoustic while drilling signal receiving transducer encapsulating apparatus | |
| CN102892064A (en) | Electroacoustic sensor packaging structure for microcomputer | |
| JP2003508997A (en) | Pressure transducer | |
| EP2610597B1 (en) | Vibration sensor | |
| EP2186352B1 (en) | Condenser microphone using the ceramic package whose inside is encompassed by metal or conductive materials | |
| CN110006520A (en) | Round tube hydrophone | |
| US3405288A (en) | Sound and vibration detector device | |
| CN104394496B (en) | A kind of MEMS silicon microphone of small size high sensitivity high s/n ratio | |
| WO2023142866A1 (en) | Mechanical vibration type electret bone voiceprint sensor | |
| CN105606200B (en) | A kind of three-axial vibration sensor structure | |
| CN103630273A (en) | Device for measuring quasi-static force via piezoelectric sensing element | |
| CN106225963A (en) | A kind of piezoelectric pressure indicator structure | |
| CN108966103A (en) | MEMS microphone package method, structure and electronic product | |
| CN113503958B (en) | Broadband vibration signal sensor and signal processing device thereof | |
| CN209706939U (en) | Round tube hydrophone | |
| CN210629859U (en) | Novel anti-radio frequency interference micro-electro-mechanical system microphone structure | |
| CN115002630A (en) | Microphone assembly and electronic equipment | |
| CN101713766B (en) | Wide frequency response noise resistant adapterization probe adopting double piezoelectric ceramic wafers | |
| CN209894346U (en) | Sensor and circuit thereof | |
| CN208398897U (en) | A kind of multi-functional set sensing device based on magnetic electric compound material and electret | |
| CN104581588A (en) | High-sensitivity high-SNR MEMS silicon microphone | |
| CN201839424U (en) | Solid conduction and sound transmission device | |
| CN105953910B (en) | A kind of shadow rocket projectile high-altitude explosion subsonics acquisition device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081008 Termination date: 20101031 |