CN107870348A - A kind of both arms piezoelectric seismometer core body and both arms piezoelectric seismometer - Google Patents
A kind of both arms piezoelectric seismometer core body and both arms piezoelectric seismometer Download PDFInfo
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- 239000000758 substrate Substances 0.000 claims abstract description 96
- 239000013536 elastomeric material Substances 0.000 claims abstract 2
- 230000002463 transducing effect Effects 0.000 claims description 17
- 239000013078 crystal Substances 0.000 claims description 11
- 230000005684 electric field Effects 0.000 claims description 8
- 238000012935 Averaging Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 229910000906 Bronze Inorganic materials 0.000 claims description 6
- 239000010974 bronze Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000007772 electrode material Substances 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
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- 229910003781 PbTiO3 Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910019653 Mg1/3Nb2/3 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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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- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Acoustics & Sound (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
A kind of both arms piezoelectric seismometer core body and both arms piezoelectric seismometer, including first end piezoelectric patches to the 4th end piezoelectric patches and by the first cantilever beam substrate made of elastomeric material and the second cantilever beam substrate, each end piezoelectric patches is respectively positioned at the both ends of two arm beam substrates, one end of two cantilever beam substrates is rigidly connected with a fixed support, fixed support is used for fixed support after being rigidly connected and be connected with the shell of electric geophone and is in vertical state, and each terminal voltage piece is electrically connected with output lead.The geophone for providing core based on the present invention has the advantages that high sensitivity, strong antijamming capability, wide dynamic range, Portable durable, the application of the field such as seismic prospecting, underground seam seismic exploration is more reliable and extensive by land, compared to single armed piezoelectric seismometer, for the present invention in the case of core body space-consuming identical, the frequency range of detection is wider.
Description
Technical field
The present invention relates to field of seismic exploration, more specifically to a kind of both arms piezoelectric seismometer core body and double
Arm 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 both arms piezoelectric seismometer core body and both arms piezoelectric seismometer, using cantilever beam
Formula structure detector core body, to increase the sensitivity of wave detector in the confined space, improve 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 both arms piezoelectricity seismic detection
Device core body includes：First end piezoelectric patches, the second end piezoelectric patches, the 3rd end piezoelectric patches, the 4th end piezoelectric patches and by elastic material
First cantilever beam substrate made of material and the second cantilever beam substrate, first end piezoelectric patches and the second end piezoelectric patches are individually fixed in
Both ends on one cantilever beam base length direction, the 3rd end piezoelectric patches and the 4th end piezoelectric patches are individually fixed in the second cantilever beam base
One end of both ends on the length direction of bottom, one end of the first cantilever beam substrate and the second cantilever beam substrate is firm with a fixed support
Property connection, the fixed support is used to be rigidly connected with the shell of electric geophone and fixed support is in vertical shape after being connected
State, each terminal voltage piece are electrically connected with output lead, and first end piezoelectric patches is connected with the signal voltage of the second end piezoelectric patches collection
Or first group of output is used as after current parallel progress Signal averaging, the signal of the 3rd end piezoelectric patches and the 4th end piezoelectric patches collection
Voltage Series or current parallel are used as second group of output after carrying out Signal averaging；
Identical with the second cantilever beam substrate in the first cantilever beam substrate, first end piezoelectric patches is identical with the 4th terminal voltage piece,
And first end piezoelectric patches the fixed position of the first cantilever beam substrate and the 4th end piezoelectric patches the second cantilever beam substrate fixation
Position is identical, and the second terminal voltage piece is identical with the 3rd terminal voltage piece, and the second end piezoelectric patches is in the fixation of the first cantilever beam substrate
Position is with the 3rd end piezoelectric patches when the fixed position of the second cantilever beam substrate is identical, and two groups of output voltage series connection or electric current are simultaneously
Connection is used as final output after carrying out Signal averaging, and otherwise two groups of outputs independently export.
In the both arms piezoelectric seismometer core body of the present invention, the first cantilever beam substrate and the second cantilever beam substrate are equal
It is made up of beryllium-bronze or phosphor bronze.
In the both arms piezoelectric seismometer core body of the present invention, first end piezoelectric patches, the second end piezoelectric patches, the 3rd side pressure
Electric piece, the 4th end piezoelectric patches are single layer structure, are made of piezoelectric monocrystal PMN-PT；Or
Whole or portion in the first end piezoelectric patches, the second end piezoelectric patches, the 3rd end piezoelectric patches and the 4th end piezoelectric patches
Dividing has multi-disc piezoelectric monocrystal, and the first end piezoelectric patches, the second end piezoelectric patches, the 3rd end piezoelectric patches and the 4th end piezoelectric patches are each
It is attached respectively by the arrangement of Crystal polarization direction from each piezoelectric monocrystal included, each piezoelectric monocrystal uses piezoelectric monocrystal PMN-
PT is made.
In the both arms piezoelectric seismometer core body of the present invention, the second end piezoelectric patches, the crystal orientation of the 3rd end piezoelectric patches are<
110>Direction, its polarized electric field are oriented parallel to its thickness direction, and residing transducing pattern is d31 transducing patterns；First side pressure
Electric piece, the crystal orientation of the 4th end piezoelectric patches are<001>Direction, its polarized electric field are oriented parallel to its thickness direction, residing transducing
Pattern is d33 transducing patterns.
In the both arms piezoelectric seismometer core body of the present invention, first end piezoelectric patches, the second end piezoelectric patches, the 3rd side pressure
The upper surface of each piezoelectric patches in electric piece and the 4th end piezoelectric patches, there is upper surface electrode, lower surface electrode respectively on lower surface, respectively
Upper surface electrode and each lower surface electrode draw output lead respectively；
The electrode material of upper and lower surface electrode is silver or gold；The output lead drawn on upper and lower surface electrode is copper cash.
In the both arms piezoelectric seismometer core body of the present invention, first end piezoelectric patches, the second end piezoelectric patches, the 3rd side pressure
Electric piece and the 4th end piezoelectric patches are fixed on cantilever beam substrate by bonding method.
The present invention both arms piezoelectric seismometer core body in, the first cantilever beam substrate and the second cantilever beam substrate its
Middle one end region is respectively fixed with mass, and the other end is used to be rigidly connected with the fixed support, and described
As in the structure of final output after two groups of output voltage series connection or current parallel, one of mass is in the first cantilever beam
The relative position of substrate is identical in the relative position of the second cantilever beam substrate with another mass, and the two is identical in quality.
In the both arms piezoelectric seismometer core body of the present invention, two masses are respectively positioned at first end piezoelectric patches and the
The upper surface of four end piezoelectric patches, mass lower surface and the upper surface of connected first end piezoelectric patches and the 4th end piezoelectric patches
Shape size is identical, and the two connection for being mutually completely covered, wherein first end piezoelectric patches, the 4th end piezoelectric patches are in remote
First cantilever beam substrate and the second cantilever beam substrate and fixed support are rigidly connected that one end at place.
In the both arms piezoelectric seismometer core body of the present invention, the first cantilever beam substrate and the second cantilever beam substrate on
After the fixed support is symmetrical arranged, and the fixed support is connected to the shell of electric geophone, the first cantilever beam substrate
With the second cantilever beam substrate horizontality is in when not shaking.
According to another aspect of the present invention, the present invention also provides a kind of both arms piezoelectricity earthquake inspection to solve its technical problem
Ripple device, including the both arms piezoelectric seismometer core body of any one, the both arms piezoelectric seismometer core body are consolidated as described above
The outer casing inner wall of fixed rack and the piezoelectric seismometer is rigidly connected.
Based on the present invention both arms piezoelectric seismometer core body realize piezoelectric seismometer, have high sensitivity,
The advantages that strong antijamming capability, wide dynamic range, Portable durable, the by land field such as seismic prospecting, underground seam seismic exploration
Using more reliable and extensive.Compared to single armed (single cantilever beam substrate) piezoelectric seismometer, the present invention takes empty in core body
Between in the case of identical, the frequency range of detection is wider.
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 both arms piezoelectric seismometer core body 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 both arms piezoelectric seismometer core body 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 both arms piezoelectric seismometer core body one of the present invention.
The piezoelectric seismometer core body, including cantilever beam substrate 2 (the second cantilever beam substrate), (the first cantilever beam base of cantilever beam substrate 5
Bottom), piezoelectric patches 3 (the 4th end piezoelectric patches), piezoelectric patches 6 (the 3rd end piezoelectric patches), piezoelectric patches 7 (the second end piezoelectric patches), piezoelectric patches 9
(first end piezoelectric patches), mass 4 and mass 8.Cantilever beam substrate 2, arm beam substrate 5 are made of flexible member, elasticity member
Part is more sensitive to shaking, and can increase the sensitivity of piezoelectric seismometer core body, can be preferably beryllium-bronze or phosphor bronze
It is made.Piezoelectric patches 9 is individually fixed in C-terminal and A ends on the length direction of cantilever beam substrate 5, pressure with piezoelectric patches 7 by bonding method
Electric piece 6 is individually fixed in the side a and b on the length direction of cantilever beam substrate 2, cantilever beam base with piezoelectric patches 3 by bonding method
The A ends at bottom 5 and the A ends of cantilever beam substrate 2 are rigidly connected with a fixed support 1, and fixed support 1 is used for and electric geophone
Shell be rigidly connected and connect after fixed support 1 be in vertical state, and the preferably upper end and/or lower end of fixed support 1
It is rigidly connected with the outer casing inner wall of electric geophone, the A ends of cantilever beam substrate 5 and cantilever beam substrate 2 are each perpendicular to fixed branch
Frame 1 is set, therefore after core body is arranged at electric geophone, the A ends of cantilever beam substrate 5 and cantilever beam substrate 2 are not being shaken
Horizontality is in when dynamic.Piezoelectric patches 3, piezoelectric patches 6, piezoelectric patches 7, the upper and lower surface of piezoelectric patches 9 have upper surface electrode respectively
And lower surface electrode, each upper surface electrode and each lower surface electrode draw output lead, the electrode material of upper and lower surface electrode respectively
Expect that the output lead drawn on upper and lower surface electrode is copper cash to be silver-colored or golden.The signal that piezoelectric patches 9 gathers with piezoelectric patches 7 enters
Row Voltage Series (voltage addition) or current parallel (electric current addition) are used as first group of output, and piezoelectric patches 6 gathers with piezoelectric patches 3
Signal carry out Voltage Series or current parallel as second group of output.
In the present embodiment, cantilever beam substrate 5 is identical with cantilever beam substrate 2, and piezoelectric patches 9 is identical with piezoelectric patches 3, and (piezoelectricity turns
Transsexual energy), and piezoelectric patches 9 is identical in the fixed position of cantilever beam substrate 2 with piezoelectric patches 3 in the fixed position of cantilever beam substrate 5,
Piezoelectric patches 7 distinguish with piezoelectric patches 6 it is identical, and piezoelectric patches 7 in the fixed position of cantilever beam substrate 5 and piezoelectric patches 6 in cantilever beam base
When the fixed position at bottom 2 is identical, be used as final output after the series connection of two groups of output voltages or current parallel, current parallel export or
Two groups of Signal averagings after Voltage Series output, signal are bigger.It should be appreciated that when two groups of output voltage series connection are as final defeated
It is also necessarily Voltage Series output when going out, inside each group, must inside each group when two groups of output currents are in parallel is used as final output
So and current parallel exports.In the present embodiment, cantilever beam substrate 5 and cantilever beam substrate 2 are used as an entirety, one into
Type, the visual angle shown with Fig. 1, arm beam substrate 5 is symmetrical on fixed support 1 with cantilever beam substrate 2 and each piezoelectric patches,
Including position and corresponding performance.
In the present embodiment, C-terminal and the B ends region for belonging to cantilever beam substrate 5 and cantilever beam substrate 2 are respectively solid
Surely there are mass 8, mass 4, the consolidating in cantilever beam substrate 2 with mass 4 in the fixed position of cantilever beam substrate 5 of mass 8
Positioning is put identical, and the two is identical in quality.Specifically, two masses are respectively positioned at the upper table of piezoelectric patches 9 and piezoelectric patches 3
Face, mass lower surface is identical with the upper surface shape size of connected piezoelectric patches 9 and piezoelectric patches 3, and the two is mutually complete
The connection of all standing.F (t) is represented in Fig. 1, the power that wave detector A ends are subject to when the earth vibrates, is transferred to B ends, B ends stress is FB
(t), wherein FB(t)=KF (t), K are that carry-over factor is constant；Similarly, C-terminal is transferred to, C-terminal stress is FC(t), wherein FC(t)
=kF (t), k are that carry-over factor is constant.
Piezoelectric patches 3, piezoelectric patches 6, piezoelectric patches 7, piezoelectric patches 9 are square shape single layer structure, size 10mm*10mm*
1mm, it is made of piezoelectric monocrystal (PMN-PT).Piezoelectric patches 6, the crystal orientation of piezoelectric patches 7 are<110>Direction, its polarized electric field direction
Parallel to its thickness direction, residing transducing pattern is d31 transducing patterns；Piezoelectric patches 3, the crystal orientation of piezoelectric patches 9 are<001>Side
To its polarized electric field is oriented parallel to its thickness direction, and residing transducing pattern is d33 transducing patterns.
It should be appreciated that the first end piezoelectric patches of the present invention, the second end piezoelectric patches, the residing for the first cantilever beam substrate
A part, the 4th end piezoelectric patches of the invention, the 3rd end piezoelectric patches, the Part II residing for the second cantilever beam substrate, two parts
Can independently it work, under independent working mode：First cantilever beam substrate and the second cantilever beam substrate, first end piezoelectric patches with
4th terminal voltage, first end piezoelectric patches are in the fixed position of the first cantilever beam substrate and the 4th end piezoelectric patches in the second cantilever beam base
The fixed position at bottom, the second terminal voltage piece and the 3rd terminal voltage piece, the second end piezoelectric patches the first cantilever beam substrate fixed bit
Putting can be not exclusively different in the fixed position of the second cantilever beam substrate from the 3rd end piezoelectric patches, or even entirely different, and now two
Partial independent output.
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 bimorph 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 PZT-5A bimorphs combination Flexural cantilever model, simultaneously above the centre mounted compression constitution that piezoelectric is PMN-PT
Model and single piezoelectric patches Flexural cantilever model.Because bimorph combination cantilever girder construction 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 both arms piezoelectric seismometer core body of the present invention.At this
In embodiment, the difference with embodiment illustrated in fig. 1 is：First end piezoelectric patches, the second end piezoelectric patches, the 3rd end piezoelectric patches,
Four end piezoelectric patches all have two panels piezoelectric monocrystal, and each possessed each piezoelectric monocrystal is arranged by allomeric polarised direction respectively
Bonded, the transmission of the Current Voltage between two connected piezoelectric monocrystals can be achieved after bonding.In the present embodiment, each piezoelectricity
Monocrystalline realizes that the crystal orientation of piezoelectric patches 6,7,11,12 is by piezoelectric patches 9,10,7,11,6,12,3,13 respectively<110>Direction, its
Polarized electric field is oriented parallel to its thickness direction, and the transducing pattern residing for the piezoelectric patches is d31 transducing patterns；Piezoelectric patches 3,9,
10th, 13 crystal orientation is<001>Direction, its polarized electric field are oriented parallel to its thickness direction, and residing transducing pattern is d33 transducings
Pattern.The upper and lower surface of piezoelectric patches 9,10,7,11,6,12,3,13 is plated with electrode, and extraction wire.Wherein, piezoelectric patches 9 and 10
An output unit is formed, piezoelectric patches 7 and 11 forms an output unit, and two output units form first group of output, piezoelectricity
Piece 6 and 12 forms an output unit, and piezoelectric patches 3 and 13 forms an output unit, and two second group of output units formation are defeated
Go out.When then following conditions are incomplete same, two groups of outputs independently export, if identical, are exported after being superimposed together, condition
For：Arm beam substrate 5 is with cantilever beam substrate 2, piezoelectric patches 9 with piezoelectric patches 3 (piezoelectricity conversion performance), piezoelectric patches 9 in cantilever beam substrate 5
Fixed position and piezoelectric patches 3 the fixed position of cantilever beam substrate 2, piezoelectric patches 10 and piezoelectric patches 13 (piezoelectricity conversion performance),
Piezoelectric patches 10 is in the fixed position of cantilever beam substrate 5 and piezoelectric patches 13 in the fixed position of cantilever beam substrate 2, piezoelectric patches 7 and pressure
Electric piece 6, piezoelectric patches 7 are in the fixed position of cantilever beam substrate 5 and piezoelectric patches 6 in the fixed position of cantilever beam substrate 2, piezoelectric patches 11
With piezoelectric patches 12 (piezoelectricity conversion performance), piezoelectric patches 11 in the fixed position of cantilever beam substrate 5 and piezoelectric patches 12 in cantilever beam base
The fixed position at bottom 2, the quality of the quality of mass 4 and mass 8, mass 8 cantilever beam substrate 5 relative position and matter
Relative position of the gauge block 4 in cantilever beam substrate 2.Each piezoelectric patches upper and lower surface is plated with electrode, and each electrode draws output respectively
Wire, the output signal of each wire carry out the superposition of voltage or electric current.It should be appreciated that two inputs in differential output
Signal should be voltage simultaneously or be electric current simultaneously.
The operation principle of the present invention；After piezoelectric cantilever core body is shaken by the earth, piezoelectric cantilever can be with the earth
Vibrate occurrence frequency and the vibration of amplitude identical, due to the effect of mass, piezoelectric can be by for the B ends of piezoelectric cantilever, C-terminal
Power deforms upon, and due to the direct piezoelectric effect of piezoelectric, when piezoelectric produces deformation, can convert mechanical energy into electricity
Can, then gather two piezoelectric patches power on signal, it is possible to obtain earthquake electric signal.It should be appreciated that above-mentioned Fig. 1 and Fig. 3
In shown embodiment, can also not have above-mentioned mass, core body equally being capable of normal work；First terminal voltage piece,
The left and right at end where second terminal voltage piece, the 3rd terminal voltage piece and the 4th terminal voltage piece will not necessarily be arranged at cantilever beam substrate
At end points, each terminal voltage piece is no more than the three of cantilever beam base length apart from the distance of the end points at end where respective cantilever beam substrate
/ mono- can preferable wave detector design requirement.
Core of the present invention is simple, light weight, small volume, using the structure of piezoelectric patches cantilever beam, is applicable to low frequency
In vibration environment, while there is sensitivity with the elevated feature of frequency, due to seismic signal during propagation it is lossy,
The higher seismic wave of frequency amplitude in communication process is decayed bigger, can compensate earthquake wave amplitude to a certain extent with frequency
Decay caused by rate increase.
Detector core body structure provided by the invention, vibrated using the vibratory drive cantilever beam structure of local environment, so that
Piezoelectric patches produces Bending Deformation, makes to produce effective electromotive force between the Different electrodes of piezoelectric patches, 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 piezoelectric patches is arranged to upper and lower surface electrode, polarized
Direction and the direction (thickness direction) that is squeezed are consistent.Poisson effect during using piezoelectric patches from bending, is more effectively played
The performance of piezoelectric patches, improve the energy delivery efficiency of piezoelectric patches.
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)
- A kind of 1. both arms piezoelectric seismometer core body, it is characterised in that including：First end piezoelectric patches, the second end piezoelectric patches, Three end piezoelectric patches, the 4th end piezoelectric patches and by the first cantilever beam substrate made of elastomeric material and the second cantilever beam substrate, First end piezoelectric patches and the second end piezoelectric patches are individually fixed in the both ends on the first cantilever beam base length direction, the 3rd side pressure electricity Piece and the 4th end piezoelectric patches are individually fixed in the both ends on the second cantilever beam base length direction, one end of the first cantilever beam substrate It is rigidly connected with one end of the second cantilever beam substrate with a fixed support, the fixed support is used for and electric geophone Fixed support is in vertical state after shell is rigidly connected and connected, and each terminal voltage piece is electrically connected with output lead, first end Piezoelectric patches connect with the signal voltage of the second end piezoelectric patches collection or current parallel be used as after Signal averaging first group it is defeated Go out, the 3rd end piezoelectric patches is connected with the signal voltage of the 4th end piezoelectric patches collection or current parallel carries out conduct after Signal averaging Second group of output；Identical with the second cantilever beam substrate in the first cantilever beam substrate, first end piezoelectric patches is identical with the 4th terminal voltage piece, and the One end piezoelectric patches is in the fixed position of the first cantilever beam substrate and the 4th end piezoelectric patches in the fixed position of the second cantilever beam substrate Identical, the second terminal voltage piece is identical with the 3rd terminal voltage piece, and the second end piezoelectric patches is in the fixed position of the first cantilever beam substrate With the 3rd end piezoelectric patches when the fixed position of the second cantilever beam substrate is identical, two groups of output voltage series connection or current parallel enter Final output is used as after row Signal averaging, otherwise two groups of outputs independently export.
- 2. both arms piezoelectric seismometer core body according to claim 1, it is characterised in that the first cantilever beam substrate with And second cantilever beam substrate be that beryllium-bronze or phosphor bronze are made.
- 3. both arms piezoelectric seismometer core body according to claim 1, it is characterised in that the first end piezoelectric patches, Two end piezoelectric patches, the 3rd end piezoelectric patches, the 4th end piezoelectric patches are single layer structure, are made of piezoelectric monocrystal PMN-PT；OrDivide in whole or in part in the first end piezoelectric patches, the second end piezoelectric patches, the 3rd end piezoelectric patches and the 4th end piezoelectric patches Not Cai Yong multi-disc piezoelectric monocrystal structure, the first end piezoelectric patches, the second end piezoelectric patches, the 3rd end piezoelectric patches and the 4th side pressure Each piezoelectric monocrystal that electric piece is each included is attached by the arrangement of Crystal polarization direction respectively, and each piezoelectric monocrystal uses piezoelectricity list Brilliant PMN-PT is made.
- 4. both arms piezoelectric seismometer core body according to claim 1, it is characterised in that the second end piezoelectric patches, the 3rd end The crystal orientation of piezoelectric patches is<110>Direction, its polarized electric field are oriented parallel to its thickness direction, and residing transducing pattern is changed for d31 Can pattern；First end piezoelectric patches, the crystal orientation of the 4th end piezoelectric patches are<001>Direction, its polarized electric field are oriented parallel to its thickness Direction, residing transducing pattern are d33 transducing patterns.
- 5. both arms piezoelectric seismometer core body according to claim 1, it is characterised in that first end piezoelectric patches, the second end The upper surface of each piezoelectric patches in piezoelectric patches, the 3rd end piezoelectric patches and the 4th end piezoelectric patches, there is upper surface electricity respectively on lower surface Pole, lower surface electrode, each upper surface electrode and each lower surface electrode draw output lead respectively；The electrode material of upper and lower surface electrode is silver or gold；The output lead drawn on upper and lower surface electrode is copper cash.
- 6. both arms piezoelectric seismometer core body according to claim 1, it is characterised in that first end piezoelectric patches, the second end Piezoelectric patches, the 3rd end piezoelectric patches and the 4th end piezoelectric patches are fixed on cantilever beam substrate by bonding method.
- 7. both arms piezoelectric seismometer core body according to claim 1, it is characterised in that the first cantilever beam substrate and second Wherein one end region of cantilever beam substrate is respectively fixed with mass, and the other end is used to and fixed support rigidity Connection, and as in the structure of final output after two groups of output voltages series connection or current parallel, one of quality Block is identical in the relative position of the second cantilever beam substrate with another mass in the relative position of the first cantilever beam substrate, and two Person's is identical in quality.
- 8. both arms piezoelectric seismometer core body according to claim 7, it is characterised in that two masses are respectively positioned at the The upper surface of one end piezoelectric patches and the 4th end piezoelectric patches, mass lower surface and connected first end piezoelectric patches and the 4th end The upper surface shape size of piezoelectric patches is identical, and the two connection for being mutually completely covered, wherein first end piezoelectric patches, the 4th side pressure Electric piece is in being rigidly connected away from the first cantilever beam substrate and the second cantilever beam substrate and fixed support that one end at place.
- 9. both arms piezoelectric seismometer core body according to claim 1, it is characterised in that the first cantilever beam substrate and second After cantilever beam substrate is symmetrical arranged on the fixed support, and the fixed support is connected to the shell of electric geophone, First cantilever beam substrate and the second cantilever beam substrate are in horizontality when not shaking.
- 10. a kind of both arms piezoelectric seismometer, it is characterised in that including the both arms piezoelectricity as described in claim any one of 1-9 Geophone core body, the fixed support of the both arms piezoelectric seismometer core body and the shell of the piezoelectric seismometer Inwall is rigidly connected.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110108352A (en) * | 2019-05-10 | 2019-08-09 | 上海岚盒信息技术有限公司 | Vibrate logging and its low-power consumption measurement method, computer readable storage medium |
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