CN109143323B - Three-component geophone shell capable of changing coccyx - Google Patents
Three-component geophone shell capable of changing coccyx Download PDFInfo
- Publication number
- CN109143323B CN109143323B CN201811296194.9A CN201811296194A CN109143323B CN 109143323 B CN109143323 B CN 109143323B CN 201811296194 A CN201811296194 A CN 201811296194A CN 109143323 B CN109143323 B CN 109143323B
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- circuit board
- tail cone
- upper cover
- cylindrical shell
- component geophone
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- 239000011257 shell material Substances 0.000 description 44
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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
Abstract
The invention discloses a three-component geophone shell with a changeable tail cone, which comprises an MEMS sensor circuit board, a shielding cable electrically connected with the MEMS sensor circuit board, and further comprises: the device comprises a circuit board fixing frame, a cylindrical shell, an upper cover, a waterproof cable connector, an aviation plug and a tail cone. The invention discloses a three-component geophone shell with a changeable tail cone, which has complete sealing performance and waterproof performance and is convenient to assemble and disassemble integrally; the shell is light in weight, so that the sensitivity of the detector can be improved as much as possible; the rigid fixing mode of the sensor can ensure the fidelity of vibration data to the greatest extent, thereby improving the performance of the seismograph.
Description
Technical Field
The invention relates to the technical geophysical exploration and monitoring field, in particular to a three-component geophone shell capable of changing a coccyx.
Background
In recent years, with the wide application of construction operations such as rock mass construction, geothermal development, ore exploitation, hydraulic fracturing, oil and gas exploitation, water injection and gas injection in the engineering field, microseism monitoring and related technologies are vigorously developed.
When the construction is carried out, the underground stress field is often caused to change, so that tiny vibration generated by rock fracture is caused, and part of energy is released in the form of elastic waves or sound waves and propagates out to the periphery, which is a microseismic signal. The method is characterized in that a detector array is arranged in certain areas to receive seismic wave signals generated by microseism events, parameters such as specific positions of rock fracture, fracture time, fracture mode and energy released by fracture are obtained through data processing and inversion, the parameters are utilized to carry out geological or geotechnical interpretation on the rock fracture, and then engineering operation can be monitored, evaluated and guided by utilizing the parameters, so that the method has become a mainstream of microseism monitoring technology applied to the engineering field.
Microseism has a very small magnitude, typically between level-3 and level 1, and a frequency range of microseism typically between 50Hz and 1500Hz, compared to natural earthquakes, which places extremely high demands on the instrument.
The conventional microseism detector adopts a traditional moving-coil or eddy-current vibration sensor, and has the advantages of large volume, large weight, low sensitivity, low signal-to-noise ratio and low natural frequency, and the application effect in microseism monitoring is not ideal; the conventional microseism detector shell material is manufactured by metal casting or injection molding, a large amount of rubber rings are often used for guaranteeing waterproof sealing performance, loss and deformation of vibration signals are easy to cause, and the original weak microseism signals are weakened and distorted more, so that the signal-to-noise ratio is lower, and the fidelity is poorer.
Therefore, how to provide a three-component geophone housing with good tightness and wide application range without affecting vibration signals is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a three-component geophone shell with a changeable tail cone, which has complete sealing performance and waterproof performance and is convenient to assemble and disassemble integrally; the shell is light in weight, so that the sensitivity of the detector can be improved as much as possible; the rigid fixing mode of the sensor can ensure the fidelity of vibration data to the greatest extent, thereby improving the performance of the seismograph.
In order to achieve the above object, the present invention provides the following technical solutions:
a three-component geophone housing of convertible tail cone, includes MEMS sensor circuit board and with MEMS sensor circuit board electric connection's shielded cable, still includes: the device comprises a circuit board fixing frame, a cylindrical shell, an upper cover, a waterproof cable connector, an aviation plug and a tail cone;
the MEMS sensor circuit board is provided with at least three circuit boards, namely a first circuit board, a second circuit board and a third circuit board;
the circuit board fixing frame is of a columnar hollow structure, and one end of the columnar hollow structure is provided with the first circuit board; two circuit board mounting grooves are vertically formed in the side wall of the columnar hollow structure; the second circuit board and the third circuit board are respectively arranged in the two circuit board mounting grooves; the first circuit board, the second circuit board and the third circuit board are perpendicular in pairs; the first circuit board is transversely fixed, and the second circuit board and the third circuit board are longitudinally fixed; the shielding cable is respectively and electrically connected with the first circuit board, the second circuit board and the third circuit board;
the circuit board fixing frame is arranged in the cylindrical shell; the opening end of the cylindrical shell is covered with the upper cover, and the upper cover is provided with a threading hole; the shielding cable sequentially passes through the upper cover and the waterproof cable connector to be connected with the aviation plug; the closed end of the cylindrical shell is fixedly connected with the caudal vertebra.
Through the technical scheme, the invention has the technical effects that: the invention has complete sealing performance and waterproof performance, and is convenient to assemble and disassemble integrally; the shell is light in weight, so that the sensitivity of the detector can be improved as much as possible; the rigid fixing mode of the sensor can ensure the fidelity of vibration data to the greatest extent, thereby improving the performance of the seismograph.
Preferably, in the three-component geophone shell with the tailcone changeable function, the first mounting positioning hole is formed in the side wall of the circuit board fixing frame, the second mounting positioning hole is formed in the side wall of the cylindrical shell, and the first mounting positioning hole is matched with the second mounting positioning hole and is fastened through a fastening screw.
Through the technical scheme, the invention has the technical effects that: the circuit board fixing frame is arranged in the cylindrical shell, the first circuit board fixing frame mounting positioning hole is aligned with the second circuit board fixing frame mounting positioning hole of the cylindrical shell, so that the circuit board fixing frame has a common axis, and the circuit board fixing frame is tightly fixed by using a set screw, so that the circuit board fixing frame and the cylindrical shell are in close contact and have no relative displacement.
Preferably, in the three-component geophone housing with the tailcone changeable, the three-component geophone housing further comprises a circuit board four mounted at the other end of the columnar hollow structure.
Preferably, in the three-component geophone casing with a changeable tail cone, the closed end of the cylindrical casing is provided with a tail cone mounting groove, and an inner pipe thread is arranged on the inner wall of the tail cone mounting groove.
Preferably, in the three-component geophone housing with a changeable tail cone, the mounting part at the top end of the tail cone is provided with an outer pipe thread, and the inner pipe thread is matched with the outer pipe thread.
Preferably, in a three-component geophone housing of the type described above, the tailcone includes, but is not limited to: universal caudal, planar caudal, elongated caudal, and shallow caudal.
Through the technical scheme, the invention has the technical effects that: the universal coccyx, the detector installed with the coccyx can be placed on a soft surface or a sticky surface, so that the detector is prevented from sinking into the coccyx, and the detector can be placed on a hardened surface. The flat coccyx, by means of the curved base plate of the coccyx and appropriate fasteners, can place the detector on a vertical hardened surface or even on the top plate. The slender tail cone is convenient to insert into the soil to collect data, and the side plate above the slender tail cone can assist constructors to step on the detector in harder soil. The shallow well tail cone is suitable for shallow well embedding.
Preferably, in the three-component geophone housing with a changeable tail cone, an outer pipe thread is provided on a side wall of an opening end of the cylindrical housing, an inner pipe thread is provided on an inner wall of the upper cover, and the outer pipe thread is adapted to the inner pipe thread.
Preferably, in the three-component geophone housing with a changeable tail cone, the positioning mounting hole is sealed by using screw fastening glue.
Through the technical scheme, the invention has the technical effects that: the later stage of positioning mounting hole assembly adopts anaerobic waterproof thread fastening glue to seal, guarantees that screw hole department possesses waterproof ability.
Preferably, in the three-component geophone shell with the tailcone changeable function, the circuit board fixing frame, the cylindrical shell and the upper cover are all formed by cutting an aluminum alloy rod through a numerical control machine tool.
Through the technical scheme, the invention has the technical effects that: the shell is light in weight, so that the sensitivity of the detector can be improved as much as possible; the rigid fixing mode of the sensor can ensure the fidelity of vibration data to the greatest extent, thereby improving the performance of the seismograph.
Preferably, in the three-component geophone housing with a changeable tail cone, a waterproof glue is poured between the waterproof cable joint and the upper cover.
Through the technical scheme, the invention has the technical effects that: the waterproof capacity of the upper cover is improved by pouring waterproof glue between the waterproof cable connector and the upper cover in the early stage of assembly.
Compared with the prior art, the three-component geophone shell with the changeable tail cone has the advantages that the shell has complete sealing performance and waterproof performance, and is convenient to assemble and disassemble integrally; the shell is light in weight, so that the sensitivity of the detector can be improved as much as possible; the rigid fixing mode of the sensor can ensure the fidelity of vibration data to the greatest extent, thereby improving the performance of the seismograph.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic diagram of a circuit board according to the present invention;
FIG. 3 is a schematic diagram of a second circuit board according to the present invention;
FIG. 4 is a schematic view of a circuit board holder according to the present invention;
FIG. 5 is a rear view of the circuit board holder of the present invention;
FIG. 6 is an assembly view of a circuit board holder of the present invention;
FIG. 7 is a schematic view of a cylindrical housing structure according to the present invention;
FIG. 8 is a schematic view of the upper cover structure of the present invention;
FIG. 9 is a schematic view of a generic caudal vertebral structure of the present invention; .
FIG. 10 is a schematic view of the caudal plate structure of the present invention;
FIG. 11 is a schematic view of an elongated caudal vertebral structure of the present invention;
FIG. 12 is a schematic view of the structure of the shallow shaft tail cone of the present invention.
In the figure: a first circuit board 11, a second circuit board 12, a third circuit board 13, a fourth circuit board 14, a fixing frame of the circuit board 2, a mounting groove of the circuit board 21, a mounting positioning hole 22, a cylindrical shell 3 31 mounting positioning holes II, 32 tail cone mounting grooves, 4 upper covers, 41 threading holes, 51 general tail cones, 52 flat tail cones, 53 slender tail cones and 54 shallow tail cones.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a three-component geophone shell with a changeable tail cone, which has complete sealing performance and waterproof performance and is convenient to assemble and disassemble integrally; the shell is light in weight, so that the sensitivity of the detector can be improved as much as possible; the rigid fixing mode of the sensor can ensure the fidelity of vibration data to the greatest extent, thereby improving the performance of the seismograph.
The invention provides a three-component geophone shell with a changeable tail cone, wherein three MEMS sensor circuit boards with mutually vertical directions are respectively fixed on a circuit board fixing frame 2 through mechanical screws, the whole is arranged in a cylindrical shell 3 and is tightly propped against the cylindrical shell 3 through a set screw, a power supply line and a signal line of the sensor pass through a threading hole 41 of an upper cover 4 through a connecting cable, a waterproof cable joint and an aviation plug, and the geophone forms a closed whole after the upper cover 4, the waterproof cable joint and the tail cone are screwed.
The MEMS sensor circuit board is provided with an MEMS sensor and necessary peripheral circuits, and the mechanical appearance is divided into a circuit board I11 and a circular circuit board of the circuit board 14; the two rectangular circuit boards of the circuit board II 12 and the circuit board III 13 are respectively used for transverse fixing and vertical fixing, and the surface of the circuit board is covered with insulating solder resist green oil in a large area, so that the chips and the circuits are not shorted.
The circuit board fixing frame 2 is formed by cutting an aluminum alloy rod through a numerical control machine tool, the side wall is provided with a fastening hole site reserved for a fastening screw, four circuit board fixing positions are reserved on the bracket, two transverse fixing positions are used for fixing a round circuit board, and two longitudinal fixing positions are used for fixing a rectangular circuit board; the three sensor circuit boards are fixed on the fixing structure in three directions, the three directions are mutually perpendicular, and the directions form a group of orthogonal bases in a three-dimensional space; each sensor circuit board is fastened on the circuit board fixing frame 2 by 4M 2 multiplied by 4 pan head mechanical screws, and the contact parts are in large-area contact connection and rigid connection, so that the transmission and coupling performances of mechanical vibration are enhanced to the greatest extent.
The cylindrical shell 3 is formed by cutting an aluminum alloy rod through a machine tool, and is opened and closed at one side; the bottom of the cylindrical shell 3 is a closed end, is in a primary sealing state, and is provided with a national standard G1 internal pipe thread which is extended and used for installing different tail cones; the side wall of the shell is provided with 2M 3 mechanical threaded holes for fixing the circuit board fixing frame 2, the circuit board fixing frame 2 is connected with the two threaded holes on the shell and the two M3 multiplied by 8 12.9-level set screws in high strength through two M3.2 deep 4 countersunk holes, the relative positions of the inner layer fixing structure and the shell are firmly fixed together by the pressure between the set screws and the inner layer fixing structure, and the large-area metal rigid body connection provides powerful guarantee for vibration transmission; two M3 mechanical threaded holes of the shell are sealed by anaerobic waterproof thread fastening glue at the later stage of assembly, so that the threaded holes are guaranteed to have waterproof capability; the outside of the open end of the cylindrical housing 3 has external threads of national standard G1-1/8 for mounting the upper cover 4.
The upper cover 4 with the wire outlet hole is formed by processing aluminum alloy through a numerical control machine tool, the inner side is provided with inner pipe threads and is used for being matched with the opening end of the cylindrical shell 3, and a raw material belt is adopted in the later stage of assembly to ensure the sealing capability of the cylindrical shell; the outer side is knurled, so that the detector shell is detachable, the later replacement and maintenance of the detector are easy, and the later maintenance cost and time of the seismometer are reduced; the top is phi 16 threading hole 41 for installing M16 specification waterproof cable joint, and waterproof glue is poured between the waterproof joint and the upper cover 4 in the early stage of assembly to improve the waterproof capability of the upper cover 4.
The waterproof cable joint is a mature industrial finished product, has the specification of M16 and is used for waterproof cables with the outer diameter of 4-8 mm.
The connecting cable is a mature industrial finished product, an 8-core RVVP outdoor construction shielding cable with the square millimeter of 0.3 is adopted, the insulating material is polyvinyl chloride mixture, and the shielding woven net is 64 nets.
The aviation plug is a mature industrial finished product, and a 9-core M16-specification waterproof aviation plug is adopted.
The tail cone is formed by processing stainless steel through a numerical control machine tool and a subsequent process, has a plurality of choices suitable for different application scenes, and is tightly coupled with the cylindrical shell 3 through an outer pipe thread; the national standard G1 pipe thread is connected with the tail cone, the tail cone has good replaceable and customizable capacity, and the tail cone with the national standard G1 outer pipe thread with the reserved length of more than 8mm and less than 12mm can be connected with the detector body so as to meet the requirements of different construction environments on different fixing methods of the detector.
Referring to fig. 2 and 3, a circular MEMS sensor circuit board and a rectangular MEMS sensor circuit board are shown, respectively.
The circuit board holder 2 is shown in fig. 4, 5 and 6. Wherein the circuit board mounting groove 21 is used for placing 2 rectangular circuit boards; 4M 2 mechanical screw holes are formed in each longitudinal fixing position and used for fixing the rectangular circuit board; the two ends of the circuit board fixing frame 2 are used for placing 1-2 round circuit boards, and each transverse fixing position is perpendicular to two longitudinal fixing positions; 4M 2 mechanical screw holes are formed in each transverse fixing position and used for fixing the round circuit board; the second mounting and positioning hole 31 is formed on the side wall of the circuit board fixing frame 2 and is matched with the first mounting and positioning hole 22, the direction of the second mounting and positioning hole forms an angle of 45 degrees with the fixing positions of the two longitudinal circuit boards, and the second mounting and positioning hole is an M3.2 counter bore with a depth of 4 mm.
Referring to fig. 6, the circuit board of the detector is fixed on a circuit board bracket through M2 mechanical screws, and the MEMS sensor circuit board is installed at a transverse installation position at the bottom of the bracket and at 2 longitudinal installation positions at the middle of the bracket, and a voltage stabilizing circuit board can be installed at the transverse position at the top of the bracket to improve the working stability of the detector or not. When the circuit board is installed, as the MEMS sensor chip in the attached figure 3 occupies a larger percentage of the area of the circuit board, the height is higher, and the chip is fragile and easy to damage, so that the direct collision between the chip and an installation tool and between the chip and a bracket should be avoided during the installation, and an antistatic glove or an antistatic bracelet should be worn during the assembly, so that the chip is prevented from being broken down by static electricity.
The cylindrical housing 3 is shown in fig. 7. Two M3 mechanical threaded holes of the second mounting positioning hole 31 are used for being matched with the first mounting positioning hole 22 reserved on the circuit board bracket to tightly fix the circuit board fixing frame 2 and the shell together; national standard G1-1/8 outer pipe threads at the open end of the cylindrical shell 3 are 15mm in length and are used for installing the upper cover 4; the national standard G1 inner pipe thread of the inner wall of the tail cone mounting groove 32 of the closed end of the cylindrical shell 3 is used for mounting the changeable tail cone.
The upper cover 4 is shown in fig. 8. Wherein the threading hole 41 is a through hole of M16 for installing a waterproof cable joint; the national standard G1-1/8 inner pipe thread on the inner wall of the upper cover 4 is used for being matched with the national standard G1-1/8 outer pipe thread on the outer side of the open end of the cylindrical shell 3 so as to play a role in waterproof performance under the premise of maintainability.
Referring to fig. 1, a circuit board fixing frame 2 is placed in a cylindrical shell 3, a first mounting positioning hole 22 and a second mounting positioning hole 31 are aligned to have a common axis, two M3 set screws with the length of 8mm are used for fixing the circuit board fixing frame 2 and the cylindrical shell 3 tightly without relative displacement, then an external pipe thread of an opening end of the cylindrical shell 3 is wrapped by a raw material belt, a sufficient waterproof sealing silicone is smeared on the outer side of the raw material belt, a waterproof cable connector is mounted on a threading hole 41, an 8-core 0.3 square millimeter RVVP outdoor construction shielding cable is connected to a three-piece MEMS sensor circuit board, the cable penetrates out of an upper cover 4 shown in fig. 8 through the threading hole 41 and the waterproof cable connector, the internal pipe thread on the inner wall of the upper cover 4 is matched with the external pipe thread of the opening end, the upper cover 4 is screwed tightly, a detector is sealed and integrated, and the other end of the cable is connected to an aviation plug so that acquisition equipment is connected.
The transformable caudal vertebrae are seen in fig. 9-12. Fig. 9 shows a universal coccyx 51 suitable for multiple scenarios, where the pickup can be placed on a soft or viscous surface, ensuring that the pickup does not sink into it, or on a hardened surface. Fig. 10 shows a flat tail cone 52 suitable for use on a hardened surface or for engineering inspection, by means of a curved base plate and suitable fasteners for the tail cone, the detector can be placed on a vertical hardened surface or even on a top plate. Fig. 11 shows an elongated coccyx 53 suitable for field data collection, the elongated coccyx being conveniently inserted into the soil for data collection, and an upper side plate to assist the constructor in stepping the detector into the harder soil. Figure 12 shows a shallow tailing cone 54 suitable for shallow well embedment.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The utility model provides a three-component geophone casing of convertible tail cone, includes MEMS sensor circuit board and with MEMS sensor circuit board electric connection's shielded cable, its characterized in that still includes: the device comprises a circuit board fixing frame, a cylindrical shell, an upper cover, a waterproof cable connector, an aviation plug and a tail cone;
the MEMS sensor circuit board is provided with at least three circuit boards, namely a first circuit board, a second circuit board and a third circuit board;
the circuit board fixing frame is of a columnar hollow structure, and one end of the columnar hollow structure is provided with the first circuit board; two circuit board mounting grooves are vertically formed in the side wall of the columnar hollow structure; the second circuit board and the third circuit board are respectively arranged in the two circuit board mounting grooves; the first circuit board, the second circuit board and the third circuit board are perpendicular in pairs; the first circuit board is transversely fixed, and the second circuit board and the third circuit board are longitudinally fixed; the shielding cable is respectively and electrically connected with the first circuit board, the second circuit board and the third circuit board;
the circuit board fixing frame is arranged in the cylindrical shell; the opening end of the cylindrical shell is covered with the upper cover, and the upper cover is provided with a threading hole; the shielding cable sequentially passes through the upper cover and the waterproof cable connector to be connected with the aviation plug; the closed end of the cylindrical shell is fixedly connected with the caudal vertebra;
the closed end of the cylindrical shell is provided with a tail cone mounting groove, and the inner wall of the tail cone mounting groove is provided with inner pipe threads; the installation part at the top end of the tail cone is provided with an outer pipe thread, and the inner pipe thread is matched with the outer pipe thread; the tail cone is connected with the tail cone through national standard G1 pipe threads, and the tail cone has the replaceable and customizable capabilities; the caudal vertebrae include, but are not limited to: universal caudal, planar caudal, elongated caudal, and shallow caudal.
2. The three-component geophone shell with a changeable tail cone according to claim 1, wherein a first mounting positioning hole is formed in the side wall of the circuit board fixing frame, a second mounting positioning hole is formed in the side wall of the cylindrical shell, and the first mounting positioning hole is matched with the second mounting positioning hole and is fastened by a fastening screw.
3. The three-component geophone housing of a convertible tail cone of claim 1, further comprising a mounting board four mounted at the other end of said columnar hollow structure.
4. The three-component geophone casing of convertible tail cone according to claim 1, wherein an outer tube thread is provided on a side wall of the open end of the cylindrical housing, an inner tube thread is provided on an inner wall of the upper cover, and the outer tube thread is adapted to the inner tube thread.
5. The three-component geophone housing of a convertible tail cone of claim 2, wherein said second mounting location hole is sealed with a screw-threaded fastening glue.
6. The three-component geophone shell with a changeable tail cone according to any one of claims 1-5, wherein the circuit board fixing frame, the cylindrical shell and the upper cover are all formed by cutting an aluminum alloy rod through a numerical control machine tool.
7. A three component geophone housing for a convertible tail cone according to any of claims 1-5, wherein said waterproof cable joint is filled with a waterproof glue between said upper cover and said lower cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811296194.9A CN109143323B (en) | 2018-11-01 | 2018-11-01 | Three-component geophone shell capable of changing coccyx |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811296194.9A CN109143323B (en) | 2018-11-01 | 2018-11-01 | Three-component geophone shell capable of changing coccyx |
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| Publication Number | Publication Date |
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| CN109143323A CN109143323A (en) | 2019-01-04 |
| CN109143323B true CN109143323B (en) | 2023-11-17 |
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| CN201811296194.9A Active CN109143323B (en) | 2018-11-01 | 2018-11-01 | Three-component geophone shell capable of changing coccyx |
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| CN110806258B (en) * | 2019-11-12 | 2022-06-28 | 山东省科学院激光研究所 | Three-component fiber grating vibration sensor |
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