CN107884818A - A kind of piezoelectric seismometer - Google Patents
A kind of piezoelectric seismometer Download PDFInfo
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- CN107884818A CN107884818A CN201711331472.5A CN201711331472A CN107884818A CN 107884818 A CN107884818 A CN 107884818A CN 201711331472 A CN201711331472 A CN 201711331472A CN 107884818 A CN107884818 A CN 107884818A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
- G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
- G01V1/181—Geophones
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Abstract
The invention discloses a kind of piezoelectric seismometer, with piezoelectric seismometer core body and shell, piezoelectric seismometer core body includes cantilever beam substrate made of elastomeric material and the piezoelectricity bar arranged along cantilever beam base length direction, piezoelectricity bar is fixed in cantilever beam substrate, cantilever beam substrate certain one end along its length and the outer casing inner wall of the piezoelectric seismometer are rigidly connected, piezoelectricity bar is connected with output lead, to carry out the output of seismic signal.High sensitivity, strong antijamming capability, wide dynamic range, Portable durable are had the advantages that based on geophone provided by the invention, the application of the field such as seam seismic exploration, land seismic exploration is more reliable and extensive in underground.
Description
Technical field
The present invention relates to field of seismic exploration, more specifically to a kind of piezoelectric seismometer.
Background technology
Geophone be the direct wave of artificial explosive source or the reflected wave conversion on each stratum into electric signal, it is then defeated
Enter a kind of sensor special for being applied to geological prospecting and engineering measurement field to seismic instrument.It can be divided into 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, applied to rivers by application environment
The hydrophone of the marine exploration in lake, applied to the borehole seismometer in well-shooting.By energy conversion mechanism point
For two kinds of velocity profile wave detector and acceleration type wave detector.Compressional 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.
At present, the widest or traditional simulation geophone of domestic application, this seismic wave sensing device output
Be analog signal, land is mainly using 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 up of permanent magnet and coil, are essentially all using electricity
Magnetic induction principle, by the interaction of coil and permanent magnet so as to reaching the purpose of seismic prospecting.Inside these wave detectors
There is high flexibility structure as coil, larger relative motion easily occurs between each part and produces deformation, so waveform is easy
Produce deformation, in turn result in distorted signals, and due to the performance of permanent magnet can change and magnetic can over time and
Disappear, its life-span is not long and is vulnerable to the influence of environment, and stability is low, high-precision and high-resolution so as to meet
Seismic prospecting requirement.Process is gathered as first step seismic signal, this detector device can not obtain preferable original earthquake
Signal, the quality of collection geological data is directly influenced, has limited and complicated geological structure is obtained using method of seismic prospecting
Ability, turn into one of main bottleneck for restricting the development of petroleum exploration technology.Raising and oil with high-precision oil-gas exploration technology
The increase of gas exploration complexity, geophone develop towards low distortion, high sensitivity, wide band direction, dynamic
Scope is big, frequency response is wide, equivalent input noise is small, small volume, in light weight and anti-electromagnetic interference capability are strong, meets high-resolution
Collection requires, is the trend of current seismic wave detector development.Various new wave detectors using different new technologies, new material start
Occur.
Piezoelectric acceleration geophone is exactly the new wave detector occurred in recent years, and its internal structure is simple, nonmagnetic steel
And coil, so rigidity is big, deformation is small, and caused wave distortion is small, stable performance, high resolution, be a sensitivity compared with
High high fidelity geophone.Yuan's guarantor's ancient cooking vessel et al. have 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 have developed, all employs traditional lead
Sour zirconium and zirconia titanate [PbZrO3-PbTiO3] (abbreviation PZT), the intrinsic frequency of piezoelectric seismometer is higher, and high frequency response is preferable, but
Be due to by its traditional piezoelectric elements piezoelectric constant it is low, the influence for the shortcomings of impedance is high, so its dynamic range is small, impedance
Height, LF-response are low.Research shows new relaxor ferroelectric crystal PMN-PT [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 relatively low electrical loss,
Its combination property is more superior than PZT ceramics.Sensing element using relaxation Ferroelectric monocrystal material as piezoelectric type geophone
Part, matching detector core body structure is designed, to give full play to the performance advantage of monocrystal material, will be expected to substantially improve it
Sensitivity.
The content of the invention
The technical problem to be solved in the present invention is, to overcome sensitivity existing for existing piezoelectric seismometer inadequate, low
The deficiency of frequency difference in response, there is provided a kind of piezoelectric seismometer, using beam type structure detector core body, with the confined space
The sensitivity of interior increase wave detector, improves its LF-response performance.
According to the present invention wherein on the one hand, the present invention for solve its technical problem, there is provided piezoelectric seismometer, tool
There are piezoelectric seismometer core body and shell, the piezoelectric seismometer core body includes cantilever beam base made of elastomeric material
Bottom and the piezoelectricity bar arranged along cantilever beam base length direction, piezoelectricity bar are fixed in cantilever beam substrate, cantilever beam substrate
Certain one end and the outer casing inner wall of the piezoelectric seismometer along its length is rigidly connected, and piezoelectricity bar is connected with output and led
Line, to carry out the output of seismic signal.
Preferably, the present invention piezoelectric seismometer in, the piezoelectricity bar be located at cantilever beam substrate upper end or
Lower end, the crystal orientation of piezoelectricity bar are<001>Direction, polarized electric field is oriented parallel to piezoelectricity bar thickness direction, in cantilever beam substrate
It is close to be answered with the piezoelectricity bar part of that rigidly connected end of outer casing inner wall by the transverse direction from the material caused by vibration
Become, residing transducing pattern is d31 transducing patterns, and the transducing pattern residing for piezoelectricity bar part at the other end is d33 transducing moulds
Formula.
Preferably, in the piezoelectric seismometer of the present invention, the remote and outer casing inner wall rigidity of the cantilever beam substrate
That one end region of connection is fixed with mass.
Preferably, in the piezoelectric seismometer of the present invention, the mass is fixed on the remote cantilever beam of piezoelectricity bar
On the upper surface or lower surface of substrate.
Preferably, in the piezoelectric seismometer of the present invention, the top and bottom of the cantilever beam substrate have respectively
Upper end piezoelectricity bar and lower end piezoelectricity bar, upper end piezoelectricity bar is identical with the length of lower end piezoelectricity bar, and piezoelectricity conversion performance is consistent, and closes
In the setting symmetrical above and below of cantilever beam substrate, the mode of the output and the output of lower end piezoelectricity bar of output lead collection upper end piezoelectricity bar
Unanimously, the output of the upper end piezoelectricity bar of collection forms one group of differential output with the output of the lower end piezoelectricity bar of collection.
Preferably, in the piezoelectric seismometer of the present invention, the remote and outer casing inner wall of the remote cantilever beam substrate
That rigidly connected one end region is fixed with two masses identical in quality, and two masses are in cantilever beam substrate
Under be symmetrical arranged.
Preferably, in the piezoelectric seismometer of the present invention, described two masses are respectively positioned at upper end piezoelectricity bar
Upper surface and the lower surface of lower end piezoelectricity bar.
Preferably, in the piezoelectric seismometer of the present invention, the crystal orientation of each piezoelectricity bar is<001>Direction, it polarizes
Direction of an electric field is parallel to its thickness direction, in that rigidly connected end of the close and outer casing inner wall of cantilever beam substrate, by
Transverse strain from the material caused by vibration, residing transducing pattern are d31 transducing patterns, the piezoelectricity bar portion at the other end
Transducing pattern residing for point is d33 transducing patterns.
Preferably, in the piezoelectric seismometer of the present invention, one end of the cantilever beam substrate by pedestal with it is described
The outer casing inner wall of piezoelectric seismometer is rigidly connected, one end rigidity of the cantilever beam substrate of the piezoelectric seismometer core body
It is connected on the pedestal, the outer casing inner wall of the pedestal and the piezoelectric seismometer is rigidly connected.
Preferably, in the piezoelectric seismometer of the present invention, the piezoelectricity bar is single layer structure, using piezoelectric monocrystal
PMN-PT is made；Or
The piezoelectricity bar uses the structure of multi-disc piezoelectric monocrystal, each pressure that each piezoelectricity bar is each included in whole or in part
Electric monocrystalline is attached by the arrangement of Crystal polarization direction respectively, and each piezoelectric monocrystal is made of piezoelectric monocrystal PMN-PT.
Preferably, have respectively in the piezoelectric seismometer of the present invention, on the upper surface of each piezoelectricity bar, lower surface upper
Surface electrode, lower surface electrode, each upper surface electrode and each lower surface electrode draw output lead respectively, each upper surface electrode and
The electrode material of each lower surface electrode is silver or gold；The output lead drawn on each upper surface electrode and each lower surface electrode is copper
Line.
Based on the piezoelectric seismometer of the present invention, there is high sensitivity, wide dynamic range, Portable durable, and
For used differential structure compared to non-differential structure, antijamming capability is stronger, by land seismic prospecting, underground slot wave
The application of the fields such as seismic exploration is more reliable and extensive.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the structural representation of the preferred embodiment of piezoelectric seismometer one provided by the invention；
Fig. 2 is that new PMN-PT piezoelectrics are bent compared with sensitivity-frequency relation of PZT material under cantilever beam structure in Fig. 1
Line chart；
Fig. 3 is the structural representation of another embodiment of piezoelectric seismometer provided by the invention.
Embodiment
In order to which technical characteristic, purpose and the effect of the present invention is more clearly understood, now compares accompanying drawing and describe in detail
The embodiment of the present invention.
As shown in figure 1, its structural representation for the preferred embodiment of piezoelectric seismometer one of the present invention.The piezoelectricity
Shake wave detector has piezoelectric seismometer core body, pedestal 1 and shell (not shown), piezoelectric seismometer core body bag
Include cantilever beam substrate 2, upper end piezoelectricity bar 3 and mass 4.The outer casing inner wall of pedestal 1 and geophone is rigidly connected, cantilever
The A ends of beam substrate 2 are rigidly connected pedestal 1, and the upper surface of cantilever beam substrate 2 is fixed in the lower surface of upper end piezoelectricity bar 3, along outstanding
Arm beam base length direction arranges that is, the two length direction is parallel and in horizontality, the B ends location of cantilever beam substrate 2
Domain is fixed with mass 4, is preferably fixed in the present embodiment on the upper surface of upper end piezoelectricity bar 3.Cantilever beam substrate 2 uses bullet
Property element, flexible member to shake it is more sensitive, the sensitivity of piezoelectric seismometer core body can be increased, its preferably for beryllium green grass or young crops
Copper or phosphor bronze are made.The lower surface of upper end piezoelectricity bar 3 is fixed on the upper surface of cantilever beam substrate 2, upper end by bonding method
Piezoelectricity bar 3 be shorter in length than or the length equal to cantilever beam substrate 2.Mass 4 can use the alloys such as steel or tungsten to be made, quality
Block 4 can make upper end piezoelectricity bar 3 produce bigger strain.For different piezoelectric seismometers, by setting mass as not
With quality design the sensitivity of wave detector and resonant frequency；It is respectively provided with the upper surface of upper end piezoelectricity bar 3, lower surface
Surface electrode and lower surface electrode, output lead are drawn respectively on each surface electrode, output lead can use copper, upper end piezoelectricity bar
Output signal of the signal drawn on 3 upper surfaces and lower surface as earthquake.F (t) is represented in Fig. 1, wave detector a when the earth vibrates
The power being subject to is held, is transferred to b ends, b ends stress is FB(t), wherein FB(t)=KF (t), K are that carry-over factor is constant.
Upper surface electrode and the electrode material of lower surface electrode can use silver, copper or gold.Upper end piezoelectricity bar 3 is individual layer knot
Structure, crystal orientation are<001>Direction, its polarized electric field are oriented parallel to its thickness direction.At the nearly A ends of cantilever beam substrate 2, A ends
Piezoelectric is mainly by the transverse strain from the material caused by vibration, and now the transducing pattern residing for A side pressures electricity bar is
D31 transducing patterns, at the B ends of cantilever beam substrate 2, the transducing pattern residing for the piezoelectric at B ends is d33 transducing patterns.
Fig. 2 is shown under cantilever beam structure, is computed, and the model that piezoelectric is PMN-PT is in frequency in 0-1000Hz models
Enclose the model sensitivity that interior piezoelectric is PMN-PT and be integrally higher than the model that piezoelectric is PZT-5A.Piezoelectric is PMN-
Sensitivity of the PT double piezoelectricity bars combination Flexural cantilever model in the range of 0-1000Hz is 13.5-63.6mV/ms-2, it is not only high
In the sensitivity of the double piezoelectricity bar combination Flexural cantilever models of PZT-5A, simultaneously above the centre mounted compression constitution that piezoelectric is PMN-PT
Model and single piezoelectricity bar Flexural cantilever model.Because double piezoelectricity bar combination cantilever girder constructions make use of piezoelectric 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.
With reference to figure 3, it is the structural representation of another embodiment of piezoelectric seismometer core body of the present invention.In this implementation
In example, the piezoelectric seismometer has piezoelectric seismometer core body, pedestal 1 and a shell (not shown), piezoelectricity
Shake detector core body includes cantilever beam substrate 2, upper end piezoelectricity bar 3, mass 4, lower end piezoelectricity bar 5 and mass 6.Pedestal 1 with
The outer casing inner wall of geophone is rigidly connected, and the A ends of cantilever beam substrate 2 are rigidly connected pedestal 1, the following table of upper end piezoelectricity bar 3
The upper surface of cantilever beam substrate 2 is fixed in face, and the lower surface of cantilever beam substrate 2 is fixed in the upper surface of upper end piezoelectricity bar 5, two
Piezoelectricity bar arranges that is, three's length direction is parallel and in horizontality, upper end piezoelectricity each along cantilever beam base length direction
Bar 3 is identical with the length of lower end piezoelectricity bar 5, and piezoelectricity conversion performance is consistent, and on the setting symmetrical above and below of cantilever beam substrate, output
The output of wire collection upper end piezoelectricity bar is consistent with the mode of the output of lower end piezoelectricity bar (to work together by adopting in the present embodiment
The voltage or electric current of piezoelectricity bar are realized), the output and the output of the lower end piezoelectricity bar 5 of collection of the upper end piezoelectricity bar 3 of collection are formed
The B ends region of one group of differential output cantilever beam substrate 2 is fixed with mass 4, mass 6, in the present embodiment preferably
Mass 4 is fixed on the upper surface of upper end piezoelectricity bar 3, mass 4 is fixed on the upper surface of upper end piezoelectricity bar 3, two masses
It is identical in quality, and on 2 setting symmetrical above and below of cantilever beam substrate.Cantilever beam substrate 2 uses flexible member, and flexible member is to shake
It is dynamic more sensitive, the sensitivity of piezoelectric seismometer core body can be increased, it is preferably made up of beryllium-bronze or phosphor bronze.On
The lower surface of side pressure electricity bar 3 is fixed on the upper surface of cantilever beam substrate 2 by bonding method, upper end piezoelectricity bar 3 be shorter in length than or
Person is equal to the length of cantilever beam substrate 2.Mass 4 can use the alloys such as steel or tungsten to be made, and mass 4 can make upper end piezoelectricity bar 3
Produce bigger strain.For different piezoelectric seismometers, by setting mass to design detection for different quality
The sensitivity of device and resonant frequency.Upper surface electrode and lower surface electricity are respectively provided with the upper surface of upper end piezoelectricity bar 3, lower surface
Pole, draws output lead on each surface electrode respectively, and output lead can use copper, on the upper surface of upper end piezoelectricity bar 3 and lower surface
The signal of extraction is as one group of output；Upper surface electrode and lower surface are respectively provided with the upper surface of upper end piezoelectricity bar 5, lower surface
Electrode, output lead is drawn respectively on each surface electrode, output lead can use copper, the upper surface of upper end piezoelectricity bar 3 and lower surface
The signal of upper extraction is as another group of output；Two groups export to form one group of differential wave.F (t) is represented in Fig. 1, when the earth vibrates
The power that wave detector a ends are subject to, is transferred to b ends, and b ends stress is FB(t), wherein FB(t)=KF (t), K are that carry-over factor is constant.
Upper surface electrode and the electrode material of lower surface electrode can use silver, copper or gold.Upper end piezoelectricity bar 3 and 5 is
Single layer structure, the crystal orientation of each piezoelectricity bar are<001>Direction, its polarized electric field are oriented parallel to its thickness direction.In cantilever beam
At nearly A ends, the piezoelectric at A ends is mainly by the transverse strain from the material caused by vibration, now residing for A side pressures electricity bar
Transducing pattern be d31 transducing patterns.At the B ends of cantilever beam, the transducing pattern residing for the piezoelectric at B ends is d33 transducing moulds
Formula.
In one more embodiment of the present invention, the piezoelectricity bar uses the structure of multi-disc piezoelectric monocrystal in whole or in part,
Each piezoelectric monocrystal that each piezoelectricity bar is each included is attached by the arrangement of Crystal polarization direction respectively, and each piezoelectric monocrystal is using pressure
Electric monocrystalline PMN-PT is made, and can such as use stacked piezoelectricity bar to realize, so using more piezoelectricity bars, can sense
Signal is bigger.
The operation principle of the present invention；After piezoelectric cantilever core body is shaken by the earth, piezoelectric cantilever can be with the earth
Occurrence frequency and the vibration of amplitude identical are vibrated, the B ends of piezoelectric cantilever are due to the effect of mass, piezoelectric meeting stress hair
Raw deformation, due to the direct piezoelectric effect of piezoelectric, when piezoelectric produces deformation, electric energy can be converted mechanical energy into, so
Piezoelectricity bar power on signal is gathered afterwards, it is possible to obtains earthquake electric signal.It should be appreciated that above-mentioned Fig. 1 and reality illustrated in fig. 3
Apply in example, can also not have above-mentioned mass, core body equally being capable of normal work；Upper terminal voltage bar and lower terminal voltage bar are simultaneously
Where being not necessarily arranged at cantilever beam substrate at the left and right end points at end, upper terminal voltage piece and lower voltage piece are apart from respective cantilever beam
The distance of the end points at end where substrate be no more than 1/3rd of cantilever beam base length can preferable wave detector design need
Ask.The length of piezoelectricity bar can be equal or shorter than cantilever beam length, and preferably more than the three of the length of cantilever beam/
Two
Core of the present invention is simple, light weight, small volume, using the structure of single piezoelectricity bar cantilever beam, is applicable to low
In frequency vibration environment, while there is sensitivity with the elevated feature of frequency, because seismic signal damages during propagation
Consumption, the higher seismic wave of frequency amplitude in communication process is decayed bigger, can compensate earthquake wave amplitude to a certain extent
Increase caused decay with frequency.
Detector core body structure provided by the invention, vibrated using the vibratory drive cantilever beam structure of local environment, so that
Piezoelectricity bar produces Bending Deformation, makes to produce effective electromotive force between the Different electrodes of piezoelectricity bar, so as to make piezoelectricity more effective
Export energy.
Detector core body structure provided by the invention, has given full play to piezoelectric monocrystal (PMN-PT) anisotropic properties,
Take full advantage of the d of piezoelectric31And d33Two kinds of transducing patterns.The electrode of piezoelectricity bar is arranged to upper and lower surface electrode, polarized
Direction and the direction (thickness direction) that is squeezed are consistent.Poisson effect during using piezoelectricity bar from bending, is more effectively played
The performance of piezoelectricity bar, improve the energy delivery efficiency of piezoelectricity bar.
Generally speaking, based on the present invention provide core geophone have high sensitivity, strong antijamming capability,
The advantages that wide dynamic range, Portable durable, in underground the field such as seam seismic exploration, land seismic exploration application it is more reliable and
Extensively.
Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific
Embodiment, above-mentioned embodiment is only schematical, rather than restricted, one of ordinary skill in the art
Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make a lot
Form, these are belonged within the protection of the present invention.
Claims (10)
1. a kind of piezoelectric seismometer, there is piezoelectric seismometer core body and shell, it is characterised in that the piezoelectricity
Shaking detector core body includes cantilever beam substrate made of elastomeric material and the piezoelectricity arranged along cantilever beam base length direction
Bar, piezoelectricity bar are fixed in cantilever beam substrate, certain one end of cantilever beam substrate along its length and the piezoelectric seismometer
Outer casing inner wall be rigidly connected, piezoelectricity bar is connected with output lead, to carry out the output of seismic signal.
2. piezoelectric seismometer according to claim 1, it is characterised in that the piezoelectricity bar is located at cantilever beam substrate
Upper end or lower end, the crystal orientation of piezoelectricity bar are<001>Direction, polarized electric field is oriented parallel to piezoelectricity bar thickness direction, in cantilever
The piezoelectricity bar part of that rigidly connected end of close and outer casing inner wall of beam substrate is by from the material caused by vibration
Transverse strain, residing transducing pattern is d31 transducing patterns, and the transducing pattern residing for piezoelectricity bar part at the other end is
D33 transducing patterns.
3. piezoelectric seismometer according to claim 2, it is characterised in that the remote and shell of the cantilever beam substrate
That rigidly connected one end region of inwall is fixed with mass.
4. piezoelectric seismometer according to claim 3, it is characterised in that the mass is fixed on the remote of piezoelectricity bar
From on the upper surface or lower surface of cantilever beam substrate.
5. piezoelectric seismometer according to claim 1, it is characterised in that the top and bottom of the cantilever beam substrate
There is upper end piezoelectricity bar and lower end piezoelectricity bar respectively, upper end piezoelectricity bar is identical with the length of lower end piezoelectricity bar, piezoelectricity conversion performance
Unanimously, and on the setting symmetrical above and below of cantilever beam substrate, the output of output lead collection upper end piezoelectricity bar and lower end piezoelectricity bar
The mode of output is consistent, and one group of the output formation of lower end piezoelectricity bar of the output of the upper end piezoelectricity bar of collection with gathering is differential defeated
Go out.
6. piezoelectric seismometer according to claim 5, it is characterised in that the remote cantilever beam substrate it is remote with
That rigidly connected one end region of outer casing inner wall is fixed with two masses identical in quality, and two masses are on cantilever
The setting symmetrical above and below of beam substrate.
7. piezoelectric seismometer according to claim 6, it is characterised in that described two masses are located at upper end respectively
The upper surface of piezoelectricity bar and the lower surface of lower end piezoelectricity bar.
8. piezoelectric seismometer according to claim 5, it is characterised in that the crystal orientation of each piezoelectricity bar is<001>Side
To, its polarized electric field is oriented parallel to its thickness direction, the close and outer casing inner wall of cantilever beam substrate it is rigidly connected that
At end, by the transverse strain from the material caused by vibration, residing transducing pattern is d31 transducing patterns, at the other end
Piezoelectricity bar part residing for transducing pattern be d33 transducing patterns.
9. piezoelectric seismometer according to claim 1, it is characterised in that one end of the cantilever beam substrate passes through base
The outer casing inner wall of seat and the piezoelectric seismometer is rigidly connected, the cantilever beam substrate of the piezoelectric seismometer core body
One end is rigidly connected on the pedestal, and the outer casing inner wall of the pedestal and the piezoelectric seismometer is rigidly connected.
10. piezoelectric seismometer core body according to claim 1, it is characterised in that the piezoelectricity bar is individual layer knot
Structure, it is made of piezoelectric monocrystal PMN-PT；Or
The piezoelectricity bar uses the structure of multi-disc piezoelectric monocrystal, each piezoelectricity list that each piezoelectricity bar is each included in whole or in part
Brilliant to be attached respectively by the arrangement of Crystal polarization direction, each piezoelectric monocrystal is made of piezoelectric monocrystal PMN-PT.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109713771A (en) * | 2019-02-13 | 2019-05-03 | 上海电力学院 | Portable equipment self-power supply system based on piezo-electric generating |
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| CN207780261U (en) * | 2017-12-13 | 2018-08-28 | 中国地质大学（武汉） | A kind of piezoelectric seismometer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713771A (en) * | 2019-02-13 | 2019-05-03 | 上海电力学院 | Portable equipment self-power supply system based on piezo-electric generating |
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