CN207817222U - A kind of piezoelectric seismometer - Google Patents
A kind of piezoelectric seismometer Download PDFInfo
- Publication number
- CN207817222U CN207817222U CN201721752700.1U CN201721752700U CN207817222U CN 207817222 U CN207817222 U CN 207817222U CN 201721752700 U CN201721752700 U CN 201721752700U CN 207817222 U CN207817222 U CN 207817222U
- Authority
- CN
- China
- Prior art keywords
- piezoelectric
- geophone
- piece
- simply supported
- supported beam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 239000013013 elastic material Substances 0.000 claims abstract description 3
- 239000013078 crystal Substances 0.000 claims description 37
- 230000026683 transduction Effects 0.000 claims description 18
- 238000010361 transduction Methods 0.000 claims description 18
- 230000010287 polarization Effects 0.000 claims description 14
- 230000005684 electric field Effects 0.000 claims description 10
- 229910000906 Bronze Inorganic materials 0.000 claims description 6
- 239000010974 bronze Substances 0.000 claims description 6
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052790 beryllium Inorganic materials 0.000 claims description 3
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical group [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000007772 electrode material Substances 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 15
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000011257 shell material Substances 0.000 abstract 2
- 239000000463 material Substances 0.000 description 18
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910003781 PbTiO3 Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000334 poly[3-(3'-N,N,N-triethylamino-1-propyloxy)-4-methylthiophene-2,5-diyl hydrochloride] polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Landscapes
- Geophysics And Detection Of Objects (AREA)
Abstract
The utility model discloses a kind of piezoelectric seismometers, including simply supported beam substrate made of shell and elastic material, both ends on the length direction of simply supported beam substrate, which are rigidly attached to respectively on shell, to be horizontally disposed with, intermediate ends piezoelectric patches is provided at the half length of simply supported beam substrate, intermediate ends piezoelectric patches is electrically connected output lead to export the detection signal of piezoelectric seismometer.The piezoelectric seismometer of the utility model, have many advantages, such as high sensitivity, strong antijamming capability, wide dynamic range, Portable durable, in underground, the application of the fields such as land seismic exploration, underground seam seismic exploration is more reliable and extensive, relative to single-ended fixed cantilever beam structure, using by the fixed mode of the both-end of simply supported beam substrate, can be under conditions of equal length beam substrate, the frequency range of detection is more extensive.
Description
Technical Field
The utility model relates to a seismic exploration field, more specifically say, relate to a piezoelectricity geophone.
Background
The geophone is a special sensor applied to the fields of geological exploration and engineering measurement, and is used for converting direct waves artificially exciting a seismic source or reflected waves of various strata into electric signals and then inputting the electric signals into a seismic instrument. The detector can be divided into magnetoelectric detectors, eddy current detectors, piezoelectric detectors and the like according to the working principle. The seismic detectors can be divided into land exploration seismic detectors, underwater seismic detectors applied to exploration in rivers, lakes and seas and borehole seismic detectors applied to seismic logging according to application environments. The detector is divided into a velocity type detector and an acceleration type detector according to an energy conversion mechanism. The method can be divided into longitudinal wave detectors also called vertical detectors, transverse wave detectors also called horizontal detectors and three-component detectors. Geophones can also be divided into active geophones and passive geophones. The traditional mechanical moving-coil type and eddy current detectors belong to passive detectors, while the piezoelectric detector belongs to active detectors.
At present, the most widely used domestic is the traditional analog geophone, the output of the seismic wave sensing device is an analog signal, and the conventional or super-speed geophone is mainly used on land. The detectors are basically magnetoelectric detectors and eddy current detectors, the internal structures of the detectors are all composed of permanent magnets and coils, and the purpose of seismic exploration is achieved by the interaction of the coils and the permanent magnets by basically applying the electromagnetic induction principle. The detectors are internally provided with high-elasticity structures such as coils, large relative motion is easy to occur among all parts to generate deformation, so that waveforms are easy to generate deformation, further signal distortion is caused, the performance of a permanent magnet is changed, the magnetism is faded along with time, the service life of the permanent magnet is short, the permanent magnet is easy to be influenced by the environment, the stability is low, and the seismic exploration requirements of high precision and high resolution cannot be met. As a first step seismic signal acquisition process, the detector device cannot obtain better original seismic signals, directly influences the quality of acquired seismic data, limits the capability of obtaining a complex geological structure by adopting a seismic exploration method, and becomes one of the main bottlenecks restricting the development of a petroleum geophysical prospecting technology. With the improvement of high-precision oil-gas exploration technology and the increase of oil-gas exploration complexity, the geophone is developing towards the directions of low distortion, high sensitivity and wide frequency band, has a large dynamic range, wide frequency response, small equivalent input noise, a small volume, light weight and strong anti-electromagnetic interference capability, meets the requirement of high-resolution acquisition, and is the development trend of the current geophone. Various new types of detectors using different new technologies and materials are beginning to emerge.
The piezoelectric acceleration geophone is a novel geophone which appears in recent years, has a simple internal structure and no magnetic steel or coil, so that the geophone has the advantages of high rigidity, small deformation, small waveform distortion, stable performance and high resolution, and is a high-fidelity geophone with higher sensitivity. Yuan Baoding et al 1993An inertial piezoelectric amphibious detector is developed (Chinese patent 93232320.0); the Duke et al developed a land-used piezoelectric ceramic geophone (Chinese patent 00226749.7); YD20OO land piezoelectric seismic acceleration detector (Chinese patent 200420042025.X) was developed by Lumega qi, and traditional lead-acid zirconium and zirconium titanate [ PbZrO ] were adopted3-PbTiO3]The piezoelectric detector (PZT for short) has high natural frequency and good high-frequency response, but is influenced by the defects of low piezoelectric constant, high impedance and the like of the traditional piezoelectric element, so the dynamic range is small, the impedance is high, and the low-frequency response is low. Research shows that the novel relaxation ferroelectric crystal lead magnesium niobate-lead titanate [ xPb (Mg)1/3Nb2/3)O3-(1-x)PbTiO3]The main piezoelectric performance indexes of (PMNT for short) are far higher than that of the PZT piezoelectric ceramics which are generally used at present. The relaxor ferroelectric single crystal material has a high piezoelectric constant g33、d33Coefficient of electromechanical coupling k33Dielectric constant ε33 TAnd lower electrical loss, and the comprehensive performance of the composite material is more superior to that of PZT ceramic. The relaxation type ferroelectric single crystal material is used as a sensing element of the piezoelectric geophone, and a geophone core body structure matched with the relaxation type ferroelectric single crystal material is designed, so that the performance advantage of the single crystal material is fully exerted, and the sensitivity of the single crystal material is expected to be greatly improved.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is, for the sensitivity that overcomes current piezoelectricity geophone existence not enough, the poor not enough of low frequency response, provide a piezoelectricity geophone, adopt simply supported beam structure geophone core to increase the sensitivity of geophone in the finite space, improve its low frequency response performance.
According to the utility model discloses an wherein on the one hand, the utility model discloses a solve its technical problem, the piezoelectricity geophone that provides contains the simple beam basement that casing and elastic material made, and the both ends difference rigid connection on the length direction of simple beam basement carries out the level setting on the casing, and the half length department of simple beam basement is provided with middle-end piezoelectric piece, and middle-end piezoelectric piece electric connection output wire is with the detected signal of output piezoelectricity geophone.
Preferably, in the piezoelectric geophone according to the present invention, the simply supported beam base is made of beryllium bronze or phosphor bronze.
Preferably, in the piezoelectric geophone according to the present invention, the crystal orientation of the middle-end piezoelectric plate is a <001> direction, the direction of the polarization electric field thereof is parallel to the thickness direction thereof, and the transduction mode is a d33 transduction mode.
Preferably, in the piezoelectric geophone according to the present invention, the piezoelectric geophone further comprises a mass block disposed on the surface of the middle-end piezoelectric piece away from the base of the simply supported beam.
Preferably, in the piezoelectric geophone of the present invention, the first side end piezoelectric patch and/or the second side end piezoelectric patch are further respectively disposed at both ends or one end of the simply supported beam base in the length direction;
the voltages of the middle-end piezoelectric sheet and the side-end piezoelectric sheets are output in series or in parallel.
Preferably, in the piezoelectric geophone according to the present invention, the crystal orientation of each side piezoelectric piece is a <110> direction, the polarization electric field direction thereof is parallel to the thickness direction thereof, and the transduction mode is a d31 transduction mode; the crystal orientation of the middle-end piezoelectric plate is a <001> direction, the polarization electric field direction of the middle-end piezoelectric plate is parallel to the thickness direction of the middle-end piezoelectric plate, and the middle-end piezoelectric plate is in a d33 transduction mode.
Preferably, in the piezoelectric geophone of the present invention, the piezoelectric sheets included in the piezoelectric sheets at each end included in the piezoelectric geophone are all of a single-layer structure and made of piezoelectric single crystals PMN-PT; or,
all or part of each end piezoelectric piece contained in the piezoelectric seismic detection adopts a structure of a plurality of piezoelectric single crystals, each piezoelectric single crystal contained in each end piezoelectric piece is arranged and connected according to the crystal polarization direction, and each piezoelectric single crystal is made of a piezoelectric single crystal PMN-PT.
Preferably, in the piezoelectric geophone according to the present invention, the middle-end piezoelectric piece and each side-end piezoelectric piece having a plurality of piezoelectric single crystals are implemented by a laminated piezoelectric piece.
Preferably, in the piezoelectric geophone of the present invention, the upper surface and the lower surface of the middle-end piezoelectric piece and each of the side-end piezoelectric pieces are respectively provided with an upper surface electrode and a lower surface electrode, and each of the upper surface electrodes and each of the lower surface electrodes are respectively led out of an output lead;
the electrode materials of the upper surface electrode and the lower surface electrode of the middle end piezoelectric sheet and each side end piezoelectric sheet are silver or gold; the output leads led out from the upper surface electrodes and the lower surface electrodes are copper wires.
The utility model discloses a piezoelectricity geophone has advantages such as sensitivity height, interference killing feature are strong, dynamic range is wide, light durable, uses more reliably and extensively in fields such as land seismic exploration, groove wave seismic exploration in the pit. Compared with a cantilever beam structure with a fixed single end, the detection frequency range is wider by adopting a mode of fixing the two ends of the simply supported beam substrate under the condition of the beam substrate with the same length.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of a preferred embodiment of a piezoelectric geophone according to the present invention;
FIG. 2 is a graph showing the sensitivity-frequency relationship of the novel PMN-PT piezoelectric material to the PZT material under the simply supported beam structure shown in FIG. 1;
fig. 3 is a schematic structural diagram of another embodiment of the piezoelectric geophone provided by the present invention;
fig. 4 is a schematic structural diagram of another embodiment of the piezoelectric geophone according to the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a preferred embodiment of the piezoelectric geophone according to the present invention. The piezoelectric geophone comprises a simply supported beam substrate 2, a piezoelectric sheet 3 and a mass block 4. The simply supported beam substrate 2 is made of an elastic element which is more sensitive to vibration and can increase the sensitivity of the piezoelectric geophone, and the elastic element can be preferably made of beryllium bronze or phosphor bronze. The lower surface of the piezoelectric patch 3 is adhered to the upper end of the simply supported beam substrate 2 and is located at the half length of the simply supported beam substrate, the piezoelectric geophone is provided with a base 1 arranged on the shell, and the A end and the B end of two ends of the simply supported beam substrate 2 in the length direction are respectively and rigidly connected to the base 1 to be in horizontal arrangement in a manner of rigidly connecting the shell. In another embodiment of the present invention, the two ends of the simply supported beam base 2 can be directly rigidly connected to the housing. The mass block 4 made of steel or tungsten and other alloys is fixed on the upper surface of the piezoelectric sheet 3, and the mass block 4 can enable the piezoelectric sheet 3 to generate larger strain. For different piezoelectric geophones, the sensitivity and the resonant frequency of the geophone are designed by arranging the mass block 4 to have different masses; the bottom surface of the mass block 4 and the upper surface of the piezoelectric sheet 3 have the same size and shape, and are not connected in a staggered way; the piezoelectric patch 3 converts force into an electric signal, an upper surface electrode and a lower surface electrode are respectively arranged on the upper surface and the lower surface of the piezoelectric patch 3, output leads are respectively led out from the upper surface electrode and the lower surface electrode, and the output formed on the piezoelectric patch 3 independently forms a seismic electric signal as a detection signal of the piezoelectric geophone.
The electrode material of the upper surface electrode and the lower surface electrode may be silver, copper, or gold. The piezoelectric sheet 3 is a square single-layer structure with the size of 10mm 1mm, is made of piezoelectric single crystal (PMN-PT), the crystal orientation of the piezoelectric sheet 3 is in a <001> direction, the polarization electric field direction of the piezoelectric sheet is parallel to the thickness direction of the piezoelectric sheet, and the transduction mode is d33 transduction mode.
FIG. 2 shows that, in a simple beam structure, the model sensitivity of the model with the piezoelectric material PMN-PT calculated in the frequency range of 0-1000Hz is entirely higher than that of the model with the piezoelectric material PZT-5A. The sensitivity of a double piezoelectric patch combined simple beam model with the piezoelectric material PMN-PT in the range of 0-1000Hz is 13.5-63.6mV/ms-2The sensitivity of the model is not only higher than that of a PZT-5A double piezoelectric sheet combined simply supported beam model, but also higher than that of a central compression structure model and a single piezoelectric sheet simply supported beam model which are made of PMN-PT piezoelectric materials. This is because the bimorph combined simply supported beam structure simultaneously utilizes the d of the piezoelectric material31And d33Two transduction modes. This shows that the sensitivity of the geophone can be greatly improved by taking the PMN-PT as the sensitive material of the geophone.
Reference is made to fig. 3, which is a schematic structural diagram of another embodiment of the piezoelectric geophone of the present invention. The piezoelectric geophone comprises a simply supported beam substrate 2, a piezoelectric sheet 3, a piezoelectric sheet 5, a piezoelectric sheet 6 and a mass block 4. The utility model discloses a difference with above-mentioned embodiment only lies in piezoelectric patches 5 and 6 parts of piezoelectric patches, and piezoelectric patches 5 and piezoelectric patches 6 set up respectively in simply supported beam basement length direction's both ends A end and B end, and the electrode has also all been plated respectively to piezoelectric patches 5 and piezoelectric patches 6 upper and lower surface, draws forth the wire on each electrode respectively. The crystal orientation of the piezoelectric sheets 5 and 6 is a <110> direction, the polarization electric field direction thereof is parallel to the thickness direction thereof, and the transduction mode is a d31 transduction mode; the crystal orientation of the piezoelectric sheet 3 is a <001> direction, the polarization electric field direction thereof is parallel to the thickness direction thereof, and the transduction mode is a d33 transduction mode. In this embodiment, the piezoelectric sheets 3, 5, and 6 respectively form a set of outputs, and the three sets of output signals are superimposed to be used as a final output, where the superimposed form may be three currents connected in parallel or three voltages connected in series.
Referring to fig. 4, it is a schematic structural diagram of another embodiment of the piezoelectric geophone according to the present invention. The difference between this embodiment and the previous embodiment is that each of the piezoelectric sheets is implemented by an upper end piezoelectric sheet having a plurality of piezoelectric single crystals (a piezoelectric sheet located at the upper end of the simply supported beam substrate), the piezoelectric single crystals included in each of the end piezoelectric sheets are arranged and connected in the direction of crystal polarization, each of the piezoelectric single crystals is made of piezoelectric single crystals PMN-PT, in this embodiment, each of the upper end piezoelectric sheets is implemented by a laminated piezoelectric sheet, the upper end piezoelectric sheet on the left side in the figure has piezoelectric sheets 5 and 9 (both form a laminated piezoelectric sheet, the same below), the upper end piezoelectric sheet in the middle in the figure has piezoelectric sheets 3 and 8, and the upper end piezoelectric sheet on the right side in the figure has piezoelectric sheets 6 and 7. The crystal orientation of the laminated piezoelectric sheets 5, 9 and 6, 7 is a <110> direction, the direction of the polarization electric field is parallel to the thickness direction of the laminated piezoelectric sheets, and the piezoelectric sheets are in a d31 transduction mode; the crystal orientation of the piezoelectric sheets 3 and 8 is the <001> direction, the direction of the polarization electric field is parallel to the thickness direction, and the transduction mode of the piezoelectric sheets is the d33 transduction mode. The upper and lower surfaces of the piezoelectric sheets 3, 5, 6, 7, 8 and 9 are plated with electrodes, and leads are led out from the upper surfaces of the piezoelectric sheets 3, 5 and 6, and leads are led out from the lower surfaces of the piezoelectric sheets 7, 8 and 9. The outputs of the piezoelectric sheets 6 and 7 are superposed to form a group of outputs, the outputs of the piezoelectric sheets 3 and 8 are superposed to form a group of outputs, the outputs of the piezoelectric sheets 5 and 9 are superposed to form a group of outputs, the three groups of output currents are connected in parallel or in series and then output, and the three groups of signals are superposed to form a final output signal.
It should be understood that the embodiment shown in fig. 4 may be implemented only partially as a laminated piezoelectric sheet. In another embodiment of the present invention, only one side piezoelectric plate can be used at both ends of the middle piezoelectric plate, and more side piezoelectric plates (greater than 3 groups) can be added, as long as the signals are superimposed.
The working principle of the utility model is that; when the core body of the piezoelectric simply-supported beam is subjected to large earthquake motion, the piezoelectric simply-supported beam can vibrate with the same frequency and amplitude along with the large earthquake motion, the piezoelectric material can be stressed to deform under the action of the mass block at the middle end of the piezoelectric simply-supported beam, and mechanical energy can be converted into electric energy when the piezoelectric material deforms due to the positive piezoelectric effect of the piezoelectric material, and then electric signals on two piezoelectric patches are collected, so that earthquake electric signals can be obtained. It should be understood that the embodiments shown in fig. 1, 3 and 4 may be without the mass and the core may work as well; the first side end pressing sheet and the second side end pressing sheet do not need to be arranged at the left end point and the right end point of the end where the simply supported beam base is located, and the distance between the first side end pressing sheet and the second side end pressing sheet and the end point of the end where the simply supported beam base is located does not exceed the design requirement of the detector which is good for one third of the length of the simply supported beam base.
The utility model discloses core simple structure, the quality is light, and is small, utilizes the structure of single or many piezoelectric patches simply supported roof beam, applicable in the low frequency vibration environment, has sensitivity along with the characteristic that the frequency risees simultaneously, because the seismic wave signal is lossy at the in-process of propagating, the higher seismic wave of frequency gets bigger at the in-process amplitude attenuation of propagation, can compensate the attenuation that seismic wave amplitude produced along with the frequency increase to a certain extent.
The utility model provides a wave detector core structure utilizes the vibration drive simple beam structure vibration of environment of locating to make the piezoelectric patches produce bending deformation, make and produce effective electric potential between the different electrodes of piezoelectric patches, thereby can make the more effectual output energy of piezoelectricity.
The utility model provides a wave detector core structure, full play piezoelectric single crystal (PMN-PT)'s anisotropic performance, make full use of piezoelectric material's d31And d33Two transduction modes. The electrodes of the piezoelectric sheet are arranged as upper and lower surface electrodes, and the polarization direction is the same as the direction of compression (thickness direction). The performance of the piezoelectric sheet is more effectively exerted by utilizing the Poisson effect of the piezoelectric sheet when the piezoelectric sheet is bent, and the energy output efficiency of the piezoelectric sheet is improved.
Generally speaking, based on the utility model provides a geophone of core structure has advantages such as sensitivity height, interference killing feature are strong, dynamic range is wide, light durable, uses more reliably and extensively in fields such as pit wave seismic exploration, land seismic exploration.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (8)
1. A piezoelectric geophone is characterized by comprising a shell and a simple beam substrate made of elastic materials, wherein two ends of the simple beam substrate in the length direction are respectively and rigidly connected to the shell for horizontal arrangement, a middle-end piezoelectric piece is arranged at one half of the length of the simple beam substrate, and the middle-end piezoelectric piece is electrically connected with an output lead to output a detection signal of the piezoelectric geophone; the crystal orientation of the middle-end piezoelectric plate is a <001> direction, the direction of a polarization electric field of the middle-end piezoelectric plate is parallel to the thickness direction of the middle-end piezoelectric plate, and the middle-end piezoelectric plate is in a d33 transduction mode.
2. The piezoelectric geophone of claim 1, wherein said simply supported beam substrate is beryllium bronze or phosphor bronze.
3. The piezoelectric geophone in accordance with claim 1, further comprising a mass disposed on the side of said middle-end piezoelectric wafer remote from the simply supported beam base.
4. The piezoelectric geophone according to claim 1, wherein a first side end piezoelectric piece and/or a second side end piezoelectric piece are/is further provided at one or both ends in the length direction of the simply supported beam substrate;
the voltages of the middle-end piezoelectric sheet and the side-end piezoelectric sheets are output in series or in parallel.
5. The piezoelectric geophone according to claim 4, wherein each side piezoelectric piece has a crystal orientation of <110> direction, a polarization electric field direction parallel to a thickness direction thereof, and a transduction mode of d 31.
6. The piezoelectric geophone according to any one of claims 1 to 5, wherein the piezoelectric sheets included in each end of the piezoelectric geophone are of a single-layer structure and made of piezoelectric single crystals PMN-PT; or,
all or part of each end piezoelectric piece contained in the piezoelectric seismic detection adopts a structure of a plurality of piezoelectric single crystals, each piezoelectric single crystal contained in each end piezoelectric piece is arranged and connected according to the crystal polarization direction, and each piezoelectric single crystal is made of a piezoelectric single crystal PMN-PT.
7. The piezoelectric geophone according to claim 6, wherein the middle-side piezoelectric piece having a plurality of piezoelectric single crystals and each of the side-side piezoelectric pieces are realized by a laminated piezoelectric piece.
8. The piezoelectric geophone according to any one of claims 1 to 5, wherein the upper and lower surfaces of the middle-end piezoelectric piece and each of the side-end piezoelectric pieces are respectively provided with an upper surface electrode and a lower surface electrode, and output leads are respectively led out from each of the upper surface electrode and each of the lower surface electrode;
the electrode materials of the upper surface electrode and the lower surface electrode of the middle end piezoelectric sheet and each side end piezoelectric sheet are silver or gold; the output leads led out from the upper surface electrodes and the lower surface electrodes are copper wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721752700.1U CN207817222U (en) | 2017-12-13 | 2017-12-13 | A kind of piezoelectric seismometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721752700.1U CN207817222U (en) | 2017-12-13 | 2017-12-13 | A kind of piezoelectric seismometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207817222U true CN207817222U (en) | 2018-09-04 |
Family
ID=63333163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721752700.1U Expired - Fee Related CN207817222U (en) | 2017-12-13 | 2017-12-13 | A kind of piezoelectric seismometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207817222U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884817A (en) * | 2017-12-13 | 2018-04-06 | 中国地质大学（武汉） | A kind of piezoelectric seismometer |
-
2017
- 2017-12-13 CN CN201721752700.1U patent/CN207817222U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884817A (en) * | 2017-12-13 | 2018-04-06 | 中国地质大学（武汉） | A kind of piezoelectric seismometer |
| CN107884817B (en) * | 2017-12-13 | 2023-09-26 | 中国地质大学（武汉） | Piezoelectric geophone |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105607116B (en) | Passive piezoelectric seismometer movement and the passive piezoelectric seismometer based on the movement | |
| US10539694B2 (en) | Piezoelectric bender with additional constructive resonance | |
| US9400337B2 (en) | Beam accelerometer | |
| CN207780262U (en) | A kind of piezoelectric seismometer core and piezoelectric seismometer | |
| CN207780261U (en) | A kind of piezoelectric seismometer | |
| CN207817222U (en) | A kind of piezoelectric seismometer | |
| CN207851318U (en) | A kind of piezoelectric seismometer | |
| CN207908704U (en) | A kind of differential type bimorph geophone core and piezoelectric seismometer | |
| CN107884817B (en) | Piezoelectric geophone | |
| CN207780260U (en) | A kind of piezoelectric seismometer | |
| CN207851319U (en) | A kind of both arms piezoelectric seismometer | |
| CN207780263U (en) | A kind of differential type both arms piezoelectric seismometer and its core | |
| CN207675958U (en) | A kind of both arms piezoelectric seismometer core and both arms piezoelectric seismometer | |
| CN202042174U (en) | Zigzag piezoelectric-ceramic low-frequency underwater acoustic transducer | |
| CN107907909A (en) | A kind of piezoelectric seismometer core and piezoelectric seismometer | |
| CN107918143A (en) | A kind of piezoelectric seismometer | |
| CN107884818A (en) | A kind of piezoelectric seismometer | |
| CN106199687A (en) | Simple component geophone | |
| CN107894610A (en) | A kind of both arms piezoelectric seismometer | |
| CN200989945Y (en) | Multipurpose acceleration type piezoelectric earthquick detector | |
| CN107870348A (en) | A kind of both arms piezoelectric seismometer core body and both arms piezoelectric seismometer | |
| CN107870350B (en) | Differential dual-piezoelectric-patch geophone core and piezoelectric geophone | |
| CN110068390A (en) | Piezoelectricity and electromagnetic coupling vibrating sensor | |
| Rajapan et al. | Development of wide band underwater acoustic transducers | |
| CN107884816A (en) | A kind of piezoelectric seismometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180904 Termination date: 20211213 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |