CN203054236U - Earthquake rotation accelerometer - Google Patents
Earthquake rotation accelerometer Download PDFInfo
- Publication number
- CN203054236U CN203054236U CN2013200669632U CN201320066963U CN203054236U CN 203054236 U CN203054236 U CN 203054236U CN 2013200669632 U CN2013200669632 U CN 2013200669632U CN 201320066963 U CN201320066963 U CN 201320066963U CN 203054236 U CN203054236 U CN 203054236U
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/125—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by capacitive pick-up
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P2015/0862—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with particular means being integrated into a MEMS accelerometer structure for providing particular additional functionalities to those of a spring mass system
- G01P2015/0882—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with particular means being integrated into a MEMS accelerometer structure for providing particular additional functionalities to those of a spring mass system for providing damping of vibrations
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The utility model relates to an earthquake rotation accelerometer, comprising a housing and a bottom plate; wherein an inner part of the housing is provided with a spoke type mass spring device, two groups of pendulum differential capacitance energy transducers which are arranged symmetrically and reversely, two groups of moving-coil dampers, and a circuit board; the spoke type mass spring device is arranged in the middle of the two groups of pendulum differential capacitance energy transducers, the two groups of pendulum differential capacitance energy transducers respectively comprise an outer moving pole plate, an inner moving pole plate and a fixed pole plate; and the circuit board comprises two capacitance voltage conversion circuits, two conditioning circuits, a synthesis circuit and two damping adjusting circuits. The earthquake rotation accelerometer of the utility model has the advantages of compact structure, reasonable design, high monitoring accuracy, good reliability, and wide application range.
Description
Technical field
The utility model relates to a kind of accelerometer, particularly relates to a kind of for the two different capacitance earthquake rotation acceleration meters based on radial quality spring assembly that shake observation doughtily.
Background technology
At present, what known strong-motion earthquake observation was used is three-component accelerometer, the acceleration that obtains often is considered to thing, north and south and vertical to the vibration of three translations, in fact rigid body entire motion characteristic on one point also comprises rotation during earthquake, need to measure 6 degree of freedom vibrations, i.e. three translations and three rotations, especially near field earthquake motion, rotative component is more obvious.Repeatedly all finding to rotate the phenomenon of destroying in the violent earthquake, more rotation for example in elongated towering building (as chimney, obelisk, statue etc.), occurred and destroyed at present.Big quantity research is also found in structural seismic response, rotative component can produce very big shearing and moment of flexure in structural elements, torsional component and to wave component very big to the contribution of structural response, yet owing to reasons such as shortage rotative component records, many countries all do not consider rotary action in the seismic design of structure.Still do not have the product of earthquake rotation acceleration meter at present both at home and abroad, and be used for the inertial navigation six degree of freedom measuring system of space flight, the amount of spin that records is angular velocity, is directly used in the measurement of earthquake rotation acceleration and also has a lot of technical matterss.
Summary of the invention
The purpose of this utility model is to overcome the weak point that exists in the above-mentioned technology, and a kind of compact conformation, reasonable in design is provided, reliability height, the earthquake rotation acceleration meter of the measured earthquake rotation acceleration that monitoring accuracy is good.
In order to achieve the above object, the technical solution adopted in the utility model is: comprise shell, base plate, described enclosure is provided with radial quality spring assembly, two groups of pendulum-type differential capacitor transducers that symmetrical reverse is installed, two groups of moving-coil type dampers, circuit board, described radial quality spring assembly comprises axis, the uniform quality loop of mass distribution, interior ring, be positioned in the middle of two groups of pendulum-type differential capacitor transducers, link to each other with base plate by the axis lower end, be connected with two swing seats by quality loop, described quality loop is identical by 2-8 parameter with interior ring, the spring leaf that symmetry is installed connects, interior ring is fixedly mounted on the axis upper end, described two groups of pendulum-type differential capacitor transducers comprise outer movable plate electrode respectively, interior movable plate electrode and fixed polar plate, outer movable plate electrode, interior movable plate electrode is connected with rocker one end, the other end of rocker links to each other with swing seat, described two groups of moving-coil type dampers comprise moving-coil respectively, yoke, pole shoe, magnet steel, locating sleeve and magnetic circuit bonnet, be installed on the magnetic circuit seat by symmetrical reverse by the yoke lower end, the magnetic circuit seat is fixed on the base plate, the front end of yoke links to each other by the fixed polar plate of sleeve pipe with pendulum-type differential capacitor transducer, described moving-coil upper end respectively with outer movable plate electrode, interior movable plate electrode, rocker links to each other, the bottom extend in the magnetic slit that is formed by the outside of cylindrical pole shoe and yoke upper inner, described circuit board comprises two capacitance voltage translation circuits, two modulate circuits, combiner circuit, two damping regulating circuits, the outer movable plate electrode of every group of pendulum-type differential capacitor transducer, interior movable plate electrode is connected with a capacitance voltage translation circuit input end respectively with fixed polar plate, the input end of the output termination modulate circuit of capacitance voltage translation circuit, the output terminal of two modulate circuits connects combiner circuit, combiner circuit is used for translation component is eliminated, the voltage signal that is directly proportional with the earthquake rotation acceleration is exported in the synthetic back of rotative component, the corresponding damping regulating circuit of moving-coil in every group of moving-coil type damper, and interconnect, provide accelerometer needed damping ratio.
The utility model has the advantages that:
1, compact conformation, reasonable in design has been realized the function based on radial quality spring double pendulum electric capacity transducing in a housing;
2, utilize capacitance voltage translation circuit, modulate circuit, combiner circuit to eliminate the earthquake translatory acceleration, realized the measurement of earthquake rotation acceleration, monitoring accuracy height, good reliability;
3, applied widely, can be widely used in the observation of earthquake rotation acceleration and the rotation of civil engineering structure and measure.
Description of drawings
Fig. 1 is structure principle chart of the present utility model;
Fig. 2 is front view of the present utility model;
Fig. 3 is vertical view of the present utility model;
Fig. 4 is electrical schematic of the present utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.
By Fig. 1-Fig. 4 as can be known, the utility model comprises shell 21, base plate 16, described shell 21 inside are provided with radial quality spring assembly 31, two groups of pendulum-type differential capacitor transducers 30 that symmetrical reverse is installed, two groups of moving-coil type dampers 32, circuit board 23, described radial quality spring assembly 31 comprises axis 1, the uniform quality loop 2 of mass distribution, interior ring 3, be positioned in the middle of two groups of pendulum-type differential capacitor transducers 30, link to each other with base plate 16 by axis 1 lower end, be connected with two swing seats 6 by quality loop 2, described quality loop 2 is identical by 2-8 parameter with interior ring 3, the spring leaf 4 that symmetry is installed connects, interior ring 3 is fixedly mounted on axis 1 upper end, described two groups of pendulum-type differential capacitor transducers 30 comprise outer movable plate electrode 12 respectively, interior movable plate electrode 13 and fixed polar plate 11, outer movable plate electrode 12, interior movable plate electrode 13 is connected with rocker 7 one ends, the other end of rocker 7 links to each other with swing seat 6, described two groups of moving-coil type dampers 32 comprise moving-coil 17 respectively, yoke 10, pole shoe 18, magnet steel 19, locating sleeve 20 and magnetic circuit bonnet 9, be installed on the magnetic circuit seat 8 by symmetrical reverse by yoke 10 lower ends, magnetic circuit seat 8 is fixed on the base plate 16, the front end of yoke 10 links to each other with the fixed polar plate 11 of pendulum-type differential capacitor transducer 30 by sleeve pipe 14, described moving-coil 17 upper ends respectively with outer movable plate electrode 12, interior movable plate electrode 13, rocker 7 links to each other, the bottom extend in the magnetic slit that is formed by the outside of cylindrical pole shoe 18 and yoke 10 upper inner, described circuit board 23 comprises two capacitance voltage translation circuits 25, two modulate circuits 26, combiner circuit 27, two damping regulating circuits 28, the outer movable plate electrode 12 of every group of pendulum-type differential capacitor transducer 30, interior movable plate electrode 13 is connected with capacitance voltage translation circuit 25 input ends respectively with fixed polar plate 11, the input end of the output termination modulate circuit 26 of capacitance voltage translation circuit 25, the output terminal of two modulate circuits 26 connects combiner circuit 27, combiner circuit 27 is used for translation component is eliminated, the voltage signal that is directly proportional with the earthquake rotation acceleration is exported in the synthetic back of rotative component, moving-coil 17 corresponding damping regulating circuits 28 in every group of moving-coil type damper 32, and interconnect, provide accelerometer needed damping ratio.
The number of described spring leaf 4 is 4.
Ring 3 is fixedlyed connected with the upper end of axis 1 by fixed screw 5 in described.
Described fixed polar plate 11 outside between movable plate electrode 12 and the interior movable plate electrode 13.
Described shell 21 tops are provided with handle 22, and the side is provided with accessory power outlet 24, and accessory power outlet 24 is connected with the combiner circuit 27 of circuit board 23, two damping regulating circuits 28.
Described locating sleeve 20 is socketed in yoke 10 inside, and yoke 10 rear ends are provided with magnetic circuit bonnet 9, and locating sleeve 20 inside, pole shoe 18 rear ends are socketed with magnet steel 19.
Also by supporting sleeve 29 leg 15 is installed on the described base plate 16.
The utility model radial quality spring assembly 31 can mainly be made up of spring leaf 4, the interior ring 3 of the uniform quality loop 2 of mass distribution, 4 identical symmetry installations of parameter, each end of 4 spring leafs links to each other with quality loop 2, the other end links to each other with interior ring 3, interior ring 3 links to each other with the upper end of axis 1 by fixed screw 5, and the lower end of axis 1 links to each other with base plate 16.Radial quality spring assembly 31 hangs in the shell 21.
In the symmetria bilateralis of quality loop 2 two identical pendulum-type differential capacitor transducers 30 of parameter have been installed oppositely, pendulum-type differential capacitor transducer 30 is by outer movable plate electrode 12, interior movable plate electrode 13 and fixed polar plate 11 are formed, one end of each rocker 7 links to each other with quality loop 2 by swing seat 6 respectively, each rocker 7 other end respectively with the outer movable plate electrode 12 of two groups of differential capacitors of oppositely installing, interior movable plate electrode 13 links to each other with moving-coil 17, the fixed polar plate 11 of each differential capacitor links to each other by the yoke 10 that sleeve pipe 14 and two symmetrical reverse are installed respectively, two yokes 10 link to each other with the magnetic circuit seat 8 of reverse installation respectively, and magnetic circuit seat 8 is fixed on the base plate 16.
Magnetic circuit system, moving-coil 17 and damping regulating circuit 28 that moving-coil type damper 32 is installed by two identical symmetrical reverse of parameter are formed, each magnetic circuit system is made up of yoke 10, pole shoe 18, magnet steel 19, locating sleeve 20 and magnetic circuit bonnet 9, and is placed on the magnetic circuit seat 8 by forward and reverse.Form a magnetic slit respectively between the outside of two cylindrical pole shoes 18 and yoke 10 upper inner, moving-coil 17 upper ends of two symmetrical reverse installations link to each other with outer movable plate electrode 12, interior movable plate electrode 13, rocker 7 respectively, and the bottom of moving-coil places the magnetic slit of the magnetic circuit system of two symmetrical reverse installations.The output of moving-coil 17 links to each other with damping regulating circuit 28, provides to satisfy the needed damping ratio of earthquake rotation acceleration meter.
Circuit board 23 is made up of two identical capacitance voltage translation circuit 25, two identical modulate circuit 26, a combiner circuit 27, two identical damping regulating circuits 28 of parameter of parameter of parameter.
Two differential capacitors being formed by two groups of outer movable plate electrodes 12, interior movable plate electrode 13 and fixed polar plates 11 respectively successively capacitance voltage translation circuit 25, the modulate circuit 26 identical with two parameters link to each other, form two pendulum-type electric capacity transducing accelerometers symmetrical, the identical reverse installation of parameter.The output of the moving-coil 17 of two identical symmetrical reverse installations of parameter links to each other with two damping regulating circuits 28 respectively, and two needed damping ratios of pendulum-type electric capacity transducing accelerometer are provided.The output of two pendulum-type electric capacity transducing accelerometers inputs to combiner circuit 27 simultaneously by two modulate circuits 26, and combiner circuit 27 is eliminated translation component, the voltage signal u that rotative component synthetic back output is directly proportional with the earthquake rotation acceleration
0Form earthquake rotation acceleration meter.Earthquake rotation acceleration meter can be connected with any register (or data acquisition unit) by accessory power outlet 24, obtains earthquake rotation acceleration time-history curves.
Base plate 16 is strip aluminium sheets, and 3 legs 15, accessory power outlet 24 are installed on the base plate, and the magnetic circuit seat that axis 1, two symmetrical reverse are installed in the base plate middle part is installed in the two ends of base plate 16, and can 21 is installed on the base plate 16.
Its principle of work and process are described in detail in detail below:
Earthquake rotation acceleration meter ultimate principle can be described with Fig. 1, Fig. 2 and Fig. 4.When carrying out seismological observation, earthquake rotation acceleration meter base plate 16 is fixed on the observation station, when earthquake shakes, and the earthquake translatory acceleration
And rotation acceleration
Act on the base plate simultaneously, the magnetic circuit system that links to each other with base plate 16, axis, shell is followed base plate simultaneously and is shaken synchronously, by quality loop 2, rocker 7, outer movable plate electrode 12, the motion parts that interior movable plate electrode 13 and moving-coil 17 are formed produces relative rotation with respect to axis 1, two moving-coils 17 that are installed on two rockers 7 all produce identical relative motion with respect to the magnetic slit of two magnetic circuits, two moving-coils 17 all in magnetic slit separately cutting magnetic line produce induction electromotive force, the damping regulating circuit 28 that inputs to respectively separately of the electromotive force of Chan Shenging obtains the required damping of rotation acceleration meter separately; The outer movable plate electrode 12, the interior movable plate electrode 13 that are installed on two rockers all produce identical relative displacement with respect to fixed polar plate 11, namely are that two groups of gaps between the differential capacitor pole plate change.The variation in pole plate gap causes the capacitance variations of differential capacitor.After the differential capacitor changes in capacitance is passed through capacitance voltage translation circuit 25 and modulate circuit 26 successively, obtain the output voltage that is directly proportional with ground motion (translation and rotation) acceleration, constitute an electric capacity transducing (translation and rotation) accelerometer.
The differential equation of motion of each electric capacity transducing accelerometer is:
K in the formula
1Be moment of inertia, b is the damping force coefficient, and k is angular rigidity, and θ is the pivot angle displacement,
Be the ground translatory acceleration,
Be ground rotation acceleration, G
1Be electronic constant, i is for flowing into the electric current of moving-coil, l
0Be reduced pendulum length.When ignoring air damping, the solution of equation (1) translation and rotative component is respectively
The solution of translation component is
The solution of rotative component is
S operator, n are the self-vibration circular frequency, and D is damping ratio, and the size of D is regulated by damping circuit.The output voltage that each accelerometer is proportional to translation component is
K in the formula
cBe the sensitivity of electric capacity transducing, L
KBe the indication pendulum length, x is that movable plate electrode is with respect to the relative displacement of fixed polar plate.
By formula (4) as can be seen, the output voltage u of accelerometer
0xWith translatory acceleration s
2X is directly proportional.
The output voltage that each accelerometer is proportional to the rotation component is
By formula (5) as can be seen, the output voltage of accelerometer
With rotation acceleration
Be directly proportional.
Because being installed in the differential capacitor accelerometer of quality loop both sides is reverse installations, therefore after the output voltage of two accelerometers passes through combiner circuit when earthquake, the output voltage signal that is proportional to translatory acceleration is cancelled each other, be proportional to around the output voltage addition of the vertical rotation acceleration of axis, the output voltage of combiner circuit is
Output voltage sum when its output voltage is two accelerometer measures rotation accelerations as can be seen by formula (6), the output voltage of two accelerometers is through constituting earthquake rotation acceleration meter behind the combiner circuit.
The sensitivity of earthquake rotation acceleration meter is
In the formula
Be the frequency characteristic of earthquake rotation acceleration meter,
This earthquake rotation acceleration meter can be used for the observation of earthquake rotation acceleration and the rotation of civil engineering structure is measured.
Claims (7)
1. earthquake rotation acceleration meter, comprise shell (21), base plate (16), it is characterized in that: described shell (21) inside is provided with radial quality spring assembly (31), two groups of pendulum-type differential capacitor transducers (30) that symmetrical reverse is installed, two groups of moving-coil type dampers (32), circuit board (23), described radial quality spring assembly (31) comprises axis (1), the uniform quality loop of mass distribution (2), interior ring (3), be positioned in the middle of two groups of pendulum-type differential capacitor transducers (30), link to each other with base plate (16) by axis (1) lower end, be connected with two swing seats (6) by quality loop (2), described quality loop (2) is identical by 2-8 parameter with interior ring (3), the spring leaf (4) that symmetry is installed connects, interior ring (3) is fixedly mounted on axis (1) upper end, described two groups of pendulum-type differential capacitor transducers (30) comprise outer movable plate electrode (12) respectively, interior movable plate electrode (13) and fixed polar plate (11), outer movable plate electrode (12), interior movable plate electrode (13) is connected with rocker (7) one ends, the other end of rocker (7) links to each other with swing seat (6), described two groups of moving-coil type dampers (32) comprise moving-coil (17) respectively, yoke (10), pole shoe (18), magnet steel (19), locating sleeve (20) and magnetic circuit bonnet (9), be installed on the magnetic circuit seat (8) by symmetrical reverse by yoke (10) lower end, magnetic circuit seat (8) is fixed on the base plate (16), the front end of yoke (10) links to each other with the fixed polar plate (11) of pendulum-type differential capacitor transducer (30) by sleeve pipe (14), described moving-coil (17) upper end respectively with outer movable plate electrode (12), interior movable plate electrode (13), rocker (7) links to each other, the bottom extend in the magnetic slit that is formed by the outside of cylindrical pole shoe (18) and yoke (10) upper inner, described circuit board (23) comprises two capacitance voltage translation circuits (25), two modulate circuits (26), combiner circuit (27), two damping regulating circuits (28), the outer movable plate electrode (12) of every group of pendulum-type differential capacitor transducer (30), interior movable plate electrode (13) is connected with a capacitance voltage translation circuit (25) input end respectively with fixed polar plate (11), the input end of the output termination modulate circuit (26) of capacitance voltage translation circuit (25), the output terminal of two modulate circuits (26) connects combiner circuit (27), combiner circuit (27) is used for translation component is eliminated, the voltage signal that is directly proportional with the earthquake rotation acceleration is exported in the synthetic back of rotative component, the corresponding damping regulating circuit (28) of moving-coil (17) in every group of moving-coil type damper (32), and interconnect, provide accelerometer needed damping ratio.
2. a kind of earthquake rotation acceleration meter according to claim 1, it is characterized in that: the number of described spring leaf (4) is 4.
3. a kind of earthquake rotation acceleration meter according to claim 1 is characterized in that: encircle (3) in described and fixedly connected with the upper end of axis (1) by fixed screw (5).
4. a kind of earthquake rotation acceleration meter according to claim 1, it is characterized in that: described fixed polar plate (11) is positioned between outer movable plate electrode (12) and the movable plate electrode (13).
5. a kind of earthquake rotation acceleration meter according to claim 1, it is characterized in that: described shell (21) top is provided with handle (22), the side is provided with accessory power outlet (24), and accessory power outlet (24) is connected with combiner circuit (27), two damping regulating circuits (28) of circuit board (23).
6. a kind of earthquake rotation acceleration meter according to claim 1, it is characterized in that: described locating sleeve (20) is socketed in yoke (10) inside, yoke (10) rear end is provided with magnetic circuit bonnet (9), and locating sleeve (20) is inner, pole shoe (18) rear end is socketed with magnet steel (19).
7. a kind of earthquake rotation acceleration meter according to claim 1 is characterized in that: also by supporting sleeve (29) leg (15) is installed on the described base plate (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200669632U CN203054236U (en) | 2013-02-05 | 2013-02-05 | Earthquake rotation accelerometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200669632U CN203054236U (en) | 2013-02-05 | 2013-02-05 | Earthquake rotation accelerometer |
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| CN203054236U true CN203054236U (en) | 2013-07-10 |
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| CN2013200669632U Expired - Fee Related CN203054236U (en) | 2013-02-05 | 2013-02-05 | Earthquake rotation accelerometer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019362A (en) * | 2016-05-23 | 2016-10-12 | 中国科学院地质与地球物理研究所 | Moving coil type low-frequency expanded geophone |
| CN106353790A (en) * | 2016-10-13 | 2017-01-25 | 中国地震局工程力学研究所 | Passive servo earthquake rotation speedometer |
| CN108645503A (en) * | 2018-05-31 | 2018-10-12 | 华中科技大学 | A kind of circuit of enhancing ground sound sensor low frequency measurement ability |
| CN108873057A (en) * | 2018-07-09 | 2018-11-23 | 程之琴 | A kind of seismometer |
| CN112016234A (en) * | 2020-08-31 | 2020-12-01 | 中国地震局地球物理研究所 | Differential capacitance type seismometer mechanical pendulum, testing system and testing method |
-
2013
- 2013-02-05 CN CN2013200669632U patent/CN203054236U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019362A (en) * | 2016-05-23 | 2016-10-12 | 中国科学院地质与地球物理研究所 | Moving coil type low-frequency expanded geophone |
| CN106019362B (en) * | 2016-05-23 | 2017-02-22 | 中国科学院地质与地球物理研究所 | Moving coil type low-frequency expanded geophone |
| CN106353790A (en) * | 2016-10-13 | 2017-01-25 | 中国地震局工程力学研究所 | Passive servo earthquake rotation speedometer |
| CN106353790B (en) * | 2016-10-13 | 2018-05-29 | 中国地震局工程力学研究所 | Passive servo earthquake velocity of rotation meter |
| CN108645503A (en) * | 2018-05-31 | 2018-10-12 | 华中科技大学 | A kind of circuit of enhancing ground sound sensor low frequency measurement ability |
| CN108645503B (en) * | 2018-05-31 | 2019-11-12 | 华中科技大学 | A kind of circuit of enhancing ground sound sensor low frequency measurement ability |
| CN108873057A (en) * | 2018-07-09 | 2018-11-23 | 程之琴 | A kind of seismometer |
| CN108873057B (en) * | 2018-07-09 | 2020-12-11 | 嘉兴市祥发织造股份有限公司 | Seismometer |
| CN112016234A (en) * | 2020-08-31 | 2020-12-01 | 中国地震局地球物理研究所 | Differential capacitance type seismometer mechanical pendulum, testing system and testing method |
| CN112016234B (en) * | 2020-08-31 | 2023-08-08 | 中国地震局地球物理研究所 | Mechanical pendulum, test system and test method of differential capacitance seismometer |
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Granted publication date: 20130710 Termination date: 20160205 |
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| CF01 | Termination of patent right due to non-payment of annual fee |