CN207780262U - A kind of piezoelectric seismometer core and piezoelectric seismometer - Google Patents
A kind of piezoelectric seismometer core and piezoelectric seismometer Download PDFInfo
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- CN207780262U CN207780262U CN201721736234.8U CN201721736234U CN207780262U CN 207780262 U CN207780262 U CN 207780262U CN 201721736234 U CN201721736234 U CN 201721736234U CN 207780262 U CN207780262 U CN 207780262U
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- seismometer
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Abstract
A kind of piezoelectric seismometer core and piezoelectric seismometer, including cantilever beam substrate made of elastic material and it is located at the first end piezoelectric patches and the second terminal voltage piece at cantilever beam substrate both ends, outer casing inner wall of the one end of cantilever beam substrate for the piezoelectric seismometer that is rigidly connected, wherein one end of cantilever beam substrate is fixed in the lower surface of first end piezoelectric patches, the other end of cantilever beam substrate is fixed in the lower surface of second end piezoelectric patches, first end piezoelectric patches and second end piezoelectric patches are electrically connected output lead and carry out Voltage Series or current parallel output with the electric signal that will be respectively induced.The geophone for providing core based on the utility model has many advantages, such as high sensitivity, strong antijamming capability, wide dynamic range, Portable durable, and the application of the fields such as seismic prospecting, underground seam seismic exploration is more reliable and extensive by land.
Description
Technical field
The utility model is related to field of seismic exploration, more specifically to a kind of piezoelectric seismometer core and pressure
Electric geophone.
Background technology
Geophone is the direct wave of artificial explosive source or the reflected wave conversion on each stratum into electric signal, then defeated
Enter a kind of sensor special being applied to geological prospecting and engineering measurement field to seismic instrument.It can be divided by operation principle
The wave detectors such as magneto-electric, eddy current type and piezoelectric type.It can be divided into land seismic exploration wave detector by application environment, be applied to rivers
The hydrophone of the marine exploration in lake, applied to the borehole seismometer in well-shooting.By energy conversion machine system point
For two kinds of velocity profile wave detector and acceleration type wave detector.Longitudinal wave wave detector can be divided into from exploitation method and be also referred to as vertical detection
Device and transversal wave detector are also referred to as horizontal pickup and three-component geophone.In addition, geophone can also be divided into active detection
Device and passive seismometer.Traditional mechanical moving-coil type and eddy acceleration geophone belong to passive class wave detector, and piezoelectric seismometer category
In active class wave detector.
Currently, the simulation geophone that domestic application is widest or traditional, this seismic wave sensing device output
Be analog signal, land mainly uses conventional or super velocity profile wave detector.This kind of wave detector is essentially all magnetoelectricity
Formula wave detector, eddy current type geophone, their internal structure are made of permanent magnet and coil, are essentially all using electricity
Magnetic induction principle, by the interaction of coil and permanent magnet to achieve the purpose that seismic prospecting.Inside these wave detectors
There is high flexibility structure as coil, larger relative motion is easy to happen between each component and generates deformation, so waveform is easy
Generate deformation, in turn result in distorted signals, and due to the performance of permanent magnet can change and magnetism can with the time and
Subside, the service life is not long and is vulnerable to the influence of environment, and stability is low, in high precision and high-resolution to meet
Seismic prospecting requirement.Process is acquired as first step seismic signal, this detector device cannot obtain preferable original earthquake
Signal has directly influenced the quality of acquisition seismic data, has limited and obtain complicated geological structure using method of seismic prospecting
Ability becomes one of the main bottleneck for restricting the development of petroleum exploration technology.Raising with high-precision oil-gas exploration technology and oil
The increase of gas exploration complexity, geophone towards low distortion, high sensitivity, develop by wide band direction, dynamic
Range is big, frequency response is wide, equivalent input noise is small, small, light-weight and anti-electromagnetic interference capability is strong, meets high-resolution
Acquisition requires, and is the trend of current seismic wave detector development.Various novel wave detectors using different new technologies, new material start
Occur.
Piezoelectric acceleration geophone is exactly the novel wave detector occurred in recent years, and internal structure is simple, nonmagnetic steel
And coil, so rigidity is big, deformation is small, and generated wave distortion is small, and performance is stablized, high resolution, be a sensitivity compared with
High high fidelity geophone.Yuan's guarantor's ancient cooking vessel et al. had developed inertial piezoelectric Amphibious wave detector in 1993, and (China is specially
Profit is 93232320.0)；Du Ke is equal to have developed land piezoelectric ceramic seismic detector (Chinese patent 00226749.7)；Liu Zhaoqi
YD20OO types land piezoelectricity seismic acceleration wave detector (Chinese patent 200420042025.X) is had developed, traditional lead is all used
Sour zirconium and zirconia titanate [PbZrO3-PbTiO3] (abbreviation PZT), the intrinsic frequency of piezoelectric seismometer is higher, and high frequency response is preferable, but
It is the influence for the shortcomings of impedance is high since the piezoelectric constant by its traditional piezoelectric elements is low, so its dynamic range is small, impedance
Height, low frequency response are low.Research shows that novel relaxor ferroelectric crystal lead magnesium niobate-lead titanate [xPb (Mg1/3Nb2/3)O3-(1-x)
PbTiO3] (abbreviation PMNT) main piezoelectric property index all significantly larger than PZT piezoelectric ceramics for being commonly used.Relaxation iron
Electric monocrystal material has higher piezoelectric constant g33、d33, electromechanical coupling factor k33, permittivity ε33 TWith lower electrical loss,
Its comprehensive performance ratio PZT ceramics is more superior.Using relaxation Ferroelectric monocrystal material as the sensing element of piezoelectric type geophone
Part designs matching detector core body structure, to give full play to the performance advantage of monocrystal material, will be expected to substantially improve it
Sensitivity.
Utility model content
The technical problems to be solved in the utility model is, to overcome sensitivity existing for existing piezoelectric seismometer not
Enough, low frequency response difference deficiency provides a kind of piezoelectric seismometer core and piezoelectric seismometer, using beam type knot
Structure detector core body improves its low frequency response performance to increase the sensitivity of wave detector in a limited space.
Wherein one side according to the present utility model, the utility model are to solve its technical problem, provide a kind of piezoelectricity
Geophone core, including cantilever beam substrate made of elastic material and the first end for being located at cantilever beam substrate both ends
Piezoelectric patches and the second terminal voltage piece, one end of cantilever beam substrate are used to be rigidly connected the outer casing inner wall of piezoelectric seismometer, the
Wherein one end of cantilever beam substrate is fixed in the lower surface of one end piezoelectric patches, and cantilever beam is fixed in the lower surface of second end piezoelectric patches
The other end of substrate, first end piezoelectric patches and second end piezoelectric patches are electrically connected electric signal of the output lead will be respectively induced
Carry out Voltage Series or current parallel output.
In the piezoelectric seismometer core of the utility model, the cantilever beam substrate is beryllium-bronze or phosphor bronze system
At.
In the piezoelectric seismometer core of the utility model, the first end piezoelectric patches and the second end piezoelectric patches
It is single layer structure, is made of piezoelectric monocrystal PMN-PT；Alternatively,
The first end piezoelectric patches and/or the second end piezoelectric patches are respectively provided with multi-disc piezoelectric monocrystal, the first end
Each piezoelectric monocrystal that piezoelectric patches and the second end piezoelectric patches are included respectively is attached by the arrangement of Crystal polarization direction respectively,
Each piezoelectric monocrystal is made of piezoelectric monocrystal PMN-PT.
In the piezoelectric seismometer core of the utility model, the crystal orientation of the first end piezoelectric patches is<110>Direction,
Its polarized electric field is oriented parallel to its thickness direction, and the transducing pattern residing for the first end piezoelectric patches is d31Transducing pattern；Institute
The crystal orientation for stating second end piezoelectric patches is<001>Direction, polarized electric field are oriented parallel to its thickness direction, the second end piezoelectricity
Transducing pattern residing for piece is d33Transducing pattern.
In the piezoelectric seismometer core of the utility model, each piezoelectricity in first end piezoelectric patches and second end piezoelectric patches
Upper surface electrode, lower surface electrode, each upper surface electrode and each lower surface electrode point are respectively provided on the upper surface of piece, lower surface
Output lead is not drawn；The electrode material of first end piezoelectric patches and the upper and lower surface electrode of second end piezoelectric patches is silver or gold；First
The output lead drawn on end piezoelectric patches and the upper and lower surface electrode of second end piezoelectric patches is copper wire.
In the piezoelectric seismometer core of the utility model, the following table of first end piezoelectric patches and second end piezoelectric patches
Cantilever beam substrate is fixed in face by bonding method.
In the piezoelectric seismometer core of the utility model, wherein one end region of cantilever beam substrate is fixed with
Mass block, the other end are used to be rigidly connected with the outer casing inner wall of the piezoelectric seismometer.
The mass block is located at the upper surface of first end piezoelectric patches or second end piezoelectric patches, the mass block lower surface with
The upper surface shape size of its first end piezoelectric patches connected or second end piezoelectric patches is identical, and the company that the two is mutually completely covered
It connects.
Another aspect according to the present utility model, the utility model are to solve its technical problem, with also providing a kind of piezoelectricity
Wave detector is shaken, includes the piezoelectric seismometer core such as any of the above-described, the cantilever beam of the piezoelectric seismometer core
One end of substrate and the outer casing inner wall of the piezoelectric seismometer are rigidly connected.
In the piezoelectric seismometer of the utility model, the one of the cantilever beam substrate of the piezoelectric seismometer core
End is rigidly connected by the outer casing inner wall of pedestal and the piezoelectric seismometer, the cantilever of the piezoelectric seismometer core
One end of beam substrate is rigidly connected on the pedestal, and the outer casing inner wall of the pedestal and the piezoelectric seismometer rigidly connects
It connects.
The piezoelectric seismometer that piezoelectric seismometer core based on the utility model is realized, have high sensitivity,
The advantages that strong antijamming capability, wide dynamic range, Portable durable, the fields such as seam seismic exploration, land seismic exploration in underground
Using more reliable and extensive.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the structural schematic diagram of one preferred embodiment of piezoelectric seismometer core provided by the utility model；
Fig. 2 is that novel PMN-PT piezoelectric materials are bent compared with sensitivity-frequency relation of PZT material under cantilever beam structure in Fig. 1
Line chart；
Fig. 3 is the structural schematic diagram of another embodiment of piezoelectric seismometer core provided by the utility model.
Specific implementation mode
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing is detailed
Illustrate specific embodiment of the present utility model.
As shown in Figure 1, its structural schematic diagram for one preferred embodiment of piezoelectric seismometer core of the utility model.
The piezoelectric seismometer core, including cantilever beam substrate 2, piezoelectric patches 3 (the first terminal voltage piece), (the second terminal voltage of piezoelectric patches 7
Piece) and mass block 4, these components form bimorph cantilever beam structure, piezoelectric patches 3 and 7 are made to vibrate and vibrate with external environment.
Cantilever beam substrate 2 uses elastic element, and elastic element is more sensitive to shaking, and can increase the sensitive of piezoelectric seismometer core
Degree, can be preferably that beryllium-bronze or phosphor bronze are made.7 lower surface of piezoelectric patches is pasted on end --- the A of cantilever beam substrate 2
There is pedestal 1, the ends A of cantilever beam substrate 2 to be rigidly connected on pedestal 1 for end, piezoelectric seismometer, at horizontally disposed, pedestal 1
It is rigidly connected with the shell of geophone；3 lower surface of piezoelectric patches is pasted on another end of cantilever beam substrate 2 --- the ends B, pressure
It is fixed on 3 upper surface of electric piece using mass block 4 made of the alloys such as steel or tungsten, mass block 4 can make piezoelectric patches 3 generate bigger
Strain.For different piezoelectric seismometers, the sensitivity of wave detector is designed for different quality by the way that mass block 4 is arranged
And resonant frequency；4 bottom surface of mass block is identical as the upper surface size shape of piezoelectric patches 3, and the two is without the connection being staggered；Piezoelectric patches 3
Power is converted into electric signal with piezoelectric patches 7, upper surface electrode 5 and lower surface are respectively provided on the upper surface of piezoelectric patches 3, lower surface
Electrode 6, is respectively provided with upper surface electrode 8 and lower surface electrode 9 on the upper surface of piezoelectric patches 7, lower surface, each upper surface electrode and
Output lead is drawn in lower surface electrode respectively, one group of output is wherein formed on piezoelectric patches 3, forms one group of output on piezoelectric patches 7,
Two groups of outputs carry out the series connection output of the Parallel opertation or voltage of electric current, to form earthquake electric signal, current parallel output or electricity
Two groups of Signal averagings after pressure series connection output, signal bigger.F (t) is indicated in Fig. 1, the power that the ends wave detector a are subject to when the earth vibrates,
The ends b are transferred to, the ends b stress is FB(t), wherein FB(t)=KF (t), K are that carry-over factor is constant.
The electrode material of upper surface electrode 5 and upper surface electrode 8, lower surface electrode 6 and lower surface electrode 9 may be used
Silver, copper or gold.Piezoelectric patches 3 and piezoelectric patches 7 are square shape single layer structure, size 10mm*10mm*1mm, using piezoelectric monocrystal
(PMN-PT) it is made；The crystal orientation of piezoelectric patches 7 is<110>Direction, polarized electric field are oriented parallel to its thickness direction, piezoelectric patches a
Residing transducing pattern is d31Transducing pattern；The crystal orientation of piezoelectric patches 3 is<001>Direction, polarized electric field are oriented parallel to its thickness
Direction is spent, the transducing pattern residing for piezoelectric patches b is d33Transducing pattern.
Fig. 2 is shown under cantilever beam structure, is computed, and the model that piezoelectric material is PMN-PT is in frequency in 0-1000Hz models
It encloses the model sensitivity that interior piezoelectric material is PMN-PT and is integrally higher than the model that piezoelectric material is PZT-5A.Piezoelectric material is PMN-
Sensitivity of the bimorph combination Flexural cantilever model of PT within the scope of 0-1000Hz is 13.5-63.6mV/ms-2, not only high
The sensitivity of Flexural cantilever model is combined in PZT-5A bimorphs, simultaneously above the centre mounted compression constitution that piezoelectric material is PMN-PT
Model and single piezoelectric patches Flexural cantilever model.This is because piezoelectric material is utilized in bimorph combination cantilever girder construction at the same time
D31And d33Two kinds of transducing patterns.This shows that earthquake can be substantially improved using PMN-PT as the sensitive material of geophone
The sensitivity of wave detector.
It is the structural schematic diagram of another embodiment of piezoelectric seismometer core of the utility model with reference to figure 3.At this
In embodiment, with embodiment illustrated in fig. 1 difference lies in：First end piezoelectric patches and second end piezoelectric patches all have two panels piezoelectricity list
Crystalline substance, and respectively possessed each piezoelectric monocrystal is bonded by the arrangement of allomeric polarization direction respectively, can be achieved to be connected after bonding
Two piezoelectric monocrystals between Current Voltage transmission.In the present embodiment, each piezoelectric monocrystal passes through piezoelectric patches 3,4,6,7 respectively
It realizes, the crystal orientation of piezoelectric patches 6,7 is<110>Direction, polarized electric field are oriented parallel to its thickness direction, residing for the piezoelectric patches
Transducing pattern be d31 transducing patterns；The crystal orientation of piezoelectric patches 3,5 is<001>Direction, polarized electric field are oriented parallel to its thickness
Direction, the transducing pattern residing for the piezoelectric patches are d33 transducing patterns.3,4,6,7 upper and lower surface of piezoelectric patches is plated with electrode, and
In the upper surface extraction wire of piezoelectric patches 4 and 6, the lower surface extraction wire of piezoelectric patches 3 and 7.Wherein piezoelectric patches 3 and 4 forms one
Group output, piezoelectric patches 6 and 7 form one group of output, and two groups of output currents are in parallel or Voltage Series export.In the another of the utility model
In one embodiment, between 4 lower surface of upper surface and piezoelectric patches of piezoelectric patches 3,6 lower surface of the upper surface of piezoelectric patches 7 and piezoelectric patches
Between can not have between be connected, and also respectively draw output lead after handled again, the mode of processing also meets voltage string
The output mode of connection output or current parallel output, specific way belong to the common knowledge of this field, and which is not described herein again.
The operation principle of the utility model；After piezoelectric cantilever core is shaken by the earth, piezoelectric cantilever can be with
The earth vibration occurrence frequency and identical vibration of amplitude, due to the effect of mass block, piezoelectric material can be by for the ends B of piezoelectric cantilever
Power deforms upon, since the direct piezoelectric effect of piezoelectric material can convert mechanical energy into electricity when piezoelectric material generates deformation
Can, then acquire two piezoelectric patches power on signal, so that it may to obtain earthquake electric signal.It should be understood that above-mentioned Fig. 1 and Fig. 3
In shown embodiment, can not also have above-mentioned mass block, core that can equally work normally；First terminal voltage piece and
Where second terminal voltage piece will not necessarily be set to cantilever beam substrate at the left and right endpoint at end, the first terminal voltage piece and second end
The distance of endpoint of the voltage piece apart from end where respective cantilever beam substrate is no more than the one third of cantilever beam base length
The design requirement of preferable wave detector.
The utility model core is simple, and light weight is small, applicable using the structure of single piezoelectric patches cantilever beam
In low-frequency vibration environment, while having sensitivity with the raised feature of frequency, since seismic signal is during propagation
Lossy, the higher seismic wave of frequency amplitude in communication process is decayed bigger, can compensate seismic wave to a certain extent
Amplitude increases the decaying generated with frequency.
Detector core body structure provided by the utility model is vibrated using the vibratory drive cantilever beam structure of local environment,
So that piezoelectric patches generates Bending Deformation, make to generate effective electromotive force between the Different electrodes of piezoelectric patches, so as to make piezoelectricity more have
The output energy of effect.
Detector core body structure provided by the utility model, has given full play to the anisotropy of piezoelectric monocrystal (PMN-PT)
Can, take full advantage of the d of piezoelectric material31And d33Two kinds of transducing patterns.Set the electrode of piezoelectric patches to upper and lower surface electrode,
Polarization direction and the direction (thickness direction) that is squeezed are consistent.Poisson effect when using piezoelectric patches from bending, more effectively
The performance for playing piezoelectric patches, improves the energy delivery efficiency of piezoelectric patches.
Generally speaking, the geophone for providing core based on the utility model has high sensitivity, anti-interference energy
The advantages that power is strong, wide dynamic range, Portable durable, in underground, the application of the fields such as seam seismic exploration, land seismic exploration is more
It is reliable and extensive.
The embodiments of the present invention are described above in conjunction with attached drawing, but the utility model is not limited to
The specific implementation mode stated, the above mentioned embodiment is only schematical, rather than restrictive, this field it is common
Technical staff is not departing from the utility model aims and scope of the claimed protection situation under the enlightenment of the utility model
Under, many forms can be also made, these are belonged within the protection of the utility model.
Claims (10)
1. a kind of piezoelectric seismometer core, which is characterized in that including cantilever beam substrate and difference made of elastic material
It is pressed for being rigidly connected one end of first end piezoelectric patches and the second terminal voltage piece positioned at cantilever beam substrate both ends, cantilever beam substrate
Wherein one end of cantilever beam substrate, second end are fixed in the lower surface of the outer casing inner wall of electric geophone, first end piezoelectric patches
The other end of cantilever beam substrate is fixed in the lower surface of piezoelectric patches, and first end piezoelectric patches and second end piezoelectric patches are electrically connected output
Conducting wire carries out Voltage Series with the electric signal that will be respectively induced or current parallel exports.
2. piezoelectric seismometer core according to claim 1, which is characterized in that the cantilever beam substrate be beryllium-bronze or
Person's phosphor bronze is made.
3. piezoelectric seismometer core according to claim 1, which is characterized in that the first end piezoelectric patches and described
Two end piezoelectric patches are single layer structure, are made of piezoelectric monocrystal PMN-PT；Alternatively,
The first end piezoelectric patches and/or the second end piezoelectric patches are respectively provided with multi-disc piezoelectric monocrystal, the first end piezoelectricity
Each piezoelectric monocrystal that piece and the second end piezoelectric patches are included respectively is attached by the arrangement of Crystal polarization direction respectively, each to press
Electric monocrystalline is made of piezoelectric monocrystal PMN-PT.
4. piezoelectric seismometer core according to claim 1, which is characterized in that the crystal orientation of the first end piezoelectric patches is
<110>Direction, polarized electric field are oriented parallel to its thickness direction, and the transducing pattern residing for the first end piezoelectric patches is d31It changes
It can pattern；The crystal orientation of the second end piezoelectric patches is<001>Direction, polarized electric field is oriented parallel to its thickness direction, described
Transducing pattern residing for second end piezoelectric patches is d33Transducing pattern.
5. piezoelectric seismometer core according to claim 1, which is characterized in that first end piezoelectric patches and second end piezoelectricity
Be respectively provided with upper surface electrode, lower surface electrode in piece on the upper surface, lower surface of each piezoelectric patches, each upper surface electrode and it is each under
Surface electrode draws output lead respectively；
The electrode material of first end piezoelectric patches and the upper and lower surface electrode of second end piezoelectric patches is silver or gold；First end piezoelectric patches and
The output lead drawn on the upper and lower surface electrode of second end piezoelectric patches is copper wire.
6. piezoelectric seismometer core according to claim 1, which is characterized in that first end piezoelectric patches and the second side pressure
Cantilever beam substrate is fixed in the lower surface of electric piece by bonding method.
7. piezoelectric seismometer core according to claim 1, which is characterized in that wherein one end of the cantilever beam substrate
Region is fixed with mass block, and the other end is used to be rigidly connected with the outer casing inner wall of the piezoelectric seismometer.
8. piezoelectric seismometer core according to claim 7, which is characterized in that the mass block is located at first end piezoelectricity
The upper surface of piece or second end piezoelectric patches, the mass block lower surface and first end piezoelectric patches connected to it or second end piezoelectricity
The upper surface shape size of piece is identical, and the connection that the two is mutually completely covered.
9. a kind of piezoelectric seismometer, which is characterized in that including the piezoelectric seismometer as described in claim any one of 1-8
Core, one end of the cantilever beam substrate of the piezoelectric seismometer core and the outer casing inner wall of the piezoelectric seismometer are rigid
Property connection.
10. piezoelectric seismometer according to claim 9, which is characterized in that the piezoelectric seismometer core
One end of cantilever beam substrate is rigidly connected by the outer casing inner wall of pedestal and the piezoelectric seismometer, the piezoelectricity earthquake inspection
One end of the cantilever beam substrate of wave device core is rigidly connected on the pedestal, the pedestal and the piezoelectric seismometer
Outer casing inner wall is rigidly connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721736234.8U CN207780262U (en) | 2017-12-13 | 2017-12-13 | A kind of piezoelectric seismometer core and piezoelectric seismometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721736234.8U CN207780262U (en) | 2017-12-13 | 2017-12-13 | A kind of piezoelectric seismometer core and piezoelectric seismometer |
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| CN207780262U true CN207780262U (en) | 2018-08-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907909A (en) * | 2017-12-13 | 2018-04-13 | 中国地质大学（武汉） | A kind of piezoelectric seismometer core and piezoelectric seismometer |
| CN107918143A (en) * | 2017-12-13 | 2018-04-17 | 中国地质大学（武汉） | A kind of piezoelectric seismometer |
-
2017
- 2017-12-13 CN CN201721736234.8U patent/CN207780262U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907909A (en) * | 2017-12-13 | 2018-04-13 | 中国地质大学（武汉） | A kind of piezoelectric seismometer core and piezoelectric seismometer |
| CN107918143A (en) * | 2017-12-13 | 2018-04-17 | 中国地质大学（武汉） | A kind of piezoelectric seismometer |
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