CN101639541B - Accelerometer relative gravity meter - Google Patents
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- CN101639541B CN101639541B CN2009100920370A CN200910092037A CN101639541B CN 101639541 B CN101639541 B CN 101639541B CN 2009100920370 A CN2009100920370 A CN 2009100920370A CN 200910092037 A CN200910092037 A CN 200910092037A CN 101639541 B CN101639541 B CN 101639541B
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Abstract
An accelerometer relative gravity meter comprises a box body and a controller, wherein, the box body is internally provided with a power conversion circuit, a biaxial level gauge, a two-position rotation mechanism, a metal flexible pendulum accelerometer, a temperature control circuit, a measurement and control circuit and an A/D conversion circuit; the rotation mechanism is horizontally arranged in the middle of the box body; the two-position rotation mechanism is internally provided with the accelerometer; the biaxial level gauge is fixedly arranged on the two-position rotation mechanism; the temperature control circuit is used for controlling the metal flexible pendulum accelerometer and the A/D conversion circuit at a constant temperature; and the measurement and control circuit is used for controlling the two-position rotation mechanism to drive the two positions of the metal flexible pendulum accelerometer to rotate. When the two-position rotation mechanism rotates in place, the measurement and control circuit controls the A/D conversion circuit to measure output of the accelerometer and carry out signal conversion, and the output signal of the A/D conversion circuit is computationally processed by the controller to obtain the measurement result of relative gravity. The meter has high precision and convenient use, and can randomly measure the gravity acceleration.
Description
Technical field
The present invention relates to a kind of accelerometer formula relative gravity meter, particularly a kind of facility, quick, motor-driven high-precision accelerometer formula relative gravity measurement system.
Background technology
The gravimetry instrument is to be used for carrying out gravimetric instrument.The type of gravimetry instrument is a lot, come to divide the gravity meter that has land to use, sea gravimeter, sea-bottom gravimeter, Aero-Space gravity meter, borehole gravimeter etc. from range of application.The earth is measured gravity value can utilize the physical phenomenon relevant with gravity, for example swing of the movement of falling object under action of gravity, pendulum, telescopic spring, string vibration etc.Gravimetry tool in the application of inertia type instrument plays a very important role, and mainly refers to measure the acceleration of gravity of inertia type instrument debugging position and encrypt gravimetry.The gravimetry instrument can be divided into absolute gravimeter and relative gravity instrument from the measurement approach, and absolute gravity measurement normally utilizes principles such as the movement of falling object of object under action of gravity, telescopic spring; Relative gravity measurement is meant that measurement data is to obtain acceleration of gravity indirectly with the proportional signal of local gravitational acceleration.The former is in order to revise the instrumental error of inertia type instrument, the latter mainly is by measuring the gravimetric data of certain limit, offer that inertia type instrument is needed, the gravity data of reflection local gravity field high-frequency information (as 20 ' * 20 ', 5 ' * 5 ' or 1 ' * 1 ' mean space gravity anomaly data), finally reach the purpose that improves the inertia type instrument control accuracy.
In the application of inertia type instrument the gravimetry instrument need have high precision, fast, characteristics at random.Chang Yong common absolute gravimeter precision is lower in the market, and high product test time of precision is long, and price is expensive; And the relative gravity meter of using always on the market as G400, all needs to get back to reference point to calibrate, can not satisfy the random measurement requirement, the gravity gridding method needs to measure in advance a lot of net points, for 20 ' * 20 ' grid, error can reach more than the 50mgal, and precision is relatively low.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiency of existing gravimetry instrument, a kind of measuring accuracy height, accelerometer formula relative gravity meter easy to use are provided, can measure acceleration of gravity at random.
Technical solution of the present invention is: a kind of accelerometer formula relative gravity meter, comprise casing and controller two parts, power-switching circuit is installed in the casing, the double-shaft level instrument, two position rotating mechanisms, the metal flexible pendulous accelerometer, temperature control circuit, telemetry circuit and A/D change-over circuit, the rotating mechanism level is installed in the middle of the casing, be provided with a circular hole in the two position rotating mechanisms and be used to install accelerometer, make the balance staff of metal flexible pendulous accelerometer and the rotation axis of rotating mechanism coincide, the double-shaft level instrument is fixedly mounted on the levelness that is used to measure rotating mechanism on the two position rotating mechanisms, power-switching circuit connects external power supply and is used for to the double-shaft level instrument, two position rotating mechanisms, the metal flexible pendulous accelerometer, the temperature control circuit power supply, the temperature that temperature control circuit is used to control metal flexible pendulous accelerometer and A/D change-over circuit keeps constant, the control signal that telemetry circuit receives controller is used to control the two positions rotation that two position rotating mechanisms drive the metal flexible pendulous accelerometer, telemetry circuit control A/D change-over circuit is measured the output of accelerometer and is carried out conversion of signals after two position rotating mechanisms rotate in place, the output signal of A/D change-over circuit is carried out the measurement result that computing obtains relative gravity by controller, described metal flexible pendulous accelerometer, comprise housing, flexibility bar, the torquer moving-coil, the torquer stator of forming by yoke and permanent magnet, the signal transducer of forming by signal transducer moving-coil and signal transducer stator, triangle pendulum and servoamplifier, be full of damping liquid in the housing, the triangle pendulum, torquer moving-coil and signal transducer moving-coil are formed the pendulum assembly, the center mounting torque device moving-coil of triangle pendulum, the signal transducer moving-coil is installed on the top of triangle pendulum, the bottom connects two flexibility bars makes the pendulum assembly be connected with instrument housing elasticity, yoke is fixed on the middle part of housing, permanent magnet passes the torquer moving-coil, torquer stator and torquer moving-coil constitute torquer, the signal transducer stator is fixed on the housing and to connect sensor excitatory, when acceleration is imported, the displacement of the responsive pendulum of signal transducer assembly also is converted into electric signal, electric signal exports servoamplifier to by the signal transducer moving-coil, servoamplifier amplifies electric signal, feed back to the torquer moving-coil after the correction and produce feedback moment by torquer, this feedback moment makes the pendulum component recovery to the equilibrium position.
In the described casing lithium battery is installed, lithium battery is its charging by power-switching circuit, is double-shaft level instrument, two position rotating mechanisms, metal flexible pendulous accelerometer, temperature control circuit power supply by lithium battery when casing does not have external power supply.
Described casing is equipped with the leveling support outward, and this leveling support is made up of installing plate and three adjustable taper supporting legs.
Described flexibility bar entire body is a cylindricality, and middle symmetric position is processed into the circle of inflexions arc shape.Described triangle pendulum is a plane isosceles triangle shape, and triangle pendulum center is left through hole and is used for mounting torque device moving-coil, and the signal transducer moving-coil is installed on the top of triangle pendulum, and position, two base angles respectively connects a flexibility bar.Described triangle pendulum leaves 1 pair of through hole at least in center line symmetria bilateralis position.
Described casing is made up of inner housing and shell body, loads flexible insulant material between inner housing and the shell body, and described flexible insulant material is a space wadding.
The present invention's advantage compared with prior art is:
(1) the present invention utilizes metal pendulum-type flexure accelerometers as survey sensor, have higher measuring accuracy and antivibration and shock proof ability, in measuring instrument, be provided with temperature control circuit for accelerometer and A/D change-over circuit, accelerometer and A/D change-over circuit are worked in stationary temperature, thereby improved the precision of measuring;
(2) the present invention is installed in metal pendulum-type flexure accelerometers in the two position rotating mechanisms, metal pendulum-type flexure accelerometers can rotate with two position rotating mechanisms, when demarcating the relative gravity acceleration of the three unities, utilize the leveling of double-shaft level instrument earlier, after leveling is intact can by adjust rotating mechanism two positions realize the locality acceleration of gravity measurement and with this measured value as calibration value, like this can be after the acceleration of gravity point of having demarcated this place be finished, can the motor-driven gravity acceleration value of measuring anywhere to any measurement point, and do not need to calibrate once more, whole Measuring Time is less than 8min, compare existing relative gravity meter, the present invention has the advantage of random measurement, the efficiency of measurement height;
(3) measuring instrument of the present invention inside has increased lithium battery, and when measuring instrument during in place test at random, it is power devices in the measuring instrument that measuring instrument can adopt lithium battery, thereby has increased the dirigibility of measuring;
(4) the present invention has also designed the leveling support, makes measuring instrument of the present invention improve adaptability of the present invention in weak soil place operate as normal.
(5) the present invention is provided with insulation material equally between casing, and measuring instrument can be worked under rugged environment, has improved adaptability.
Description of drawings
Fig. 1 is the block diagram of system of the present invention;
Fig. 2 is a system of the present invention connection layout;
Fig. 3 is the structural drawing of leveling support of the present invention;
Fig. 4 is the present invention's two position rotating mechanism structural drawing;
Fig. 5 is the composition structural drawing of accelerometer of the present invention;
Fig. 6 is the composition structural drawing of accelerometer pendulum assembly of the present invention, and Fig. 6 (a) is the vertical view of pendulum assembly, and Fig. 6 (b) is the side view of pendulum assembly;
Fig. 7 is the outside drawing of accelerometer flexibility bar of the present invention, and Fig. 7 (a) is the vertical view of flexibility bar, and Fig. 7 (b) is the side view of flexibility bar;
Fig. 8 is an accelerometer signal sensor stator outside drawing of the present invention, and Fig. 8 (a) is the contour structures of signal transducer stator, and Fig. 8 (b) is the winding mode of signal transducer stator.
Embodiment
As shown in Figure 1, 2, accelerometer formula gravimetry instrument mainly is made up of casing 1 and controller 2.Power-switching circuit is installed in the casing, the double-shaft level instrument, two position rotating mechanisms, metal pendulum-type flexure accelerometers, temperature control circuit, telemetry circuit and A/D change-over circuit, the rotating mechanism level is installed in the middle of the casing, be provided with a circular hole in the two position rotating mechanisms and be used to install accelerometer, make the balance staff of metal pendulum-type flexure accelerometers and the rotation axis of rotating mechanism coincide, the double-shaft level instrument is fixedly mounted on the levelness that is used to measure rotating mechanism on the two position rotating mechanisms, power-switching circuit connects external power supply 4 and is used for to the double-shaft level instrument, two position rotating mechanisms, metal pendulum-type flexure accelerometers, the temperature control circuit power supply, the temperature that temperature control circuit is used to control metal pendulum-type flexure accelerometers and A/D change-over circuit keeps constant, the control signal that telemetry circuit receives controller is used to control the two positions rotation that two position rotating mechanisms drive accelerometer, telemetry circuit control A/D change-over circuit is measured the output of metal pendulum-type flexure accelerometers and is carried out conversion of signals after two position rotating mechanisms rotate in place, and the output signal of A/D change-over circuit is carried out the measurement result that computing obtains relative gravity by controller 2.
In casing 1 inside lithium battery is installed also.The gravimetry instrument in datum location and action the time by vehicle power or external power source and give inner lithium cell charging simultaneously, because of needs measuring instrument is moved away from car body when carrying out place test at random, reduce the error that the car body vibrations bring, under this moment gravimetry instrument "on" position if cut off vehicle power, the gravimetry instrument will automatically switch to inner lithium battery power supply, to guarantee the uninterrupted power supply of gravimetry instrument, eliminate the secondary energising error of accelerometer, when this moves the gravimetry instrument to other place after point measurement finishes randomly again, when connecting external power supply for again this moment the gravimetry instrument, gravity meter will be switched to the power supply of car launcher vehicle power and be given measuring instrument inner lithium cell charging simultaneously by inner lithium battery power supply automatically.The preferential power supply of external power supply and the inside and outside switching of feed circuit have realized the motor-driven measurement of gravimetry instrument.
Be provided with display, control panel and data processing unit in the controller 2, display can show the levelness of two axle horizontal instrument and the computing result of data processing unit, send control signal by the telemetry circuit of control panel in casing and control two position rotating mechanisms and drive accelerometers and carry out the rotation of two positions, after two position rotating mechanisms rotate in place, control the A/D change-over circuit automatically and the output of accelerometer is measured and carry out conversion of signals by telemetry circuit.The controller of relative gravity meter can be realized linking to each other with casing by signal wire, also controller and casing can be realized integrated structure design.The automatic remote transmission that the result of controller can link to each other with host computer 3 and realize data by signal wire.
Because accelerometer formula gravimetry instrument is open-air environment for use, when soft terrain measuring instruments such as running into sandy soil can't carry out leveling, can a leveling support be installed at bottom half.As shown in Figure 3, the leveling support is made up of an installing plate and three length-adjustable taper supporting legs, when the gravimetry instrument when soft terrains such as sandy soil are measured, measuring instrument is placed on the leveling support, be put into class soft terrains such as sandy soil again, adjust the leveling support make its relative with the ground contact firm, and ground do not have relative motion, by the length of adjusting three taper supporting legs the gravimetry instrument is fixed, and then is adjusted two axle horizontal instrument two position rotating mechanisms are up to the standard.
As shown in Figure 4, the chief component of two position rotating mechanisms comprises turntable stage body 41, retaining nail 44 servomotors 43 and gear set 45, retaining nail 44, servomotor 43 and gear set 45 are installed on the turntable stage body 41, leave the circular hole 42 that is used to install accelerometer in the gear set 45, the center of circular hole 42 is the rotation axis of two position rotating mechanisms, during turntable work, servomotor 43 driven gear groups 45 are rotated on stage body 41 together with accelerometer, gear set 45 stopped operating to the retaining nail whenever and finishes the conversion of two positions in 44 o'clock, and accelerometer is in respectively ± the 1g test mode.At the position trystate, in the test between the position slewing rate of rotation axis be 10 ° of-20 °/s, this rotation axis has the automated location function, can realize the automated location conversion of two positions, rotation axis position slewing area is 180 °.
Because accelerometer adopts two position methods to demarcate acceleration of gravity, the leveling precision also directly influences measuring accuracy, therefore need initial leveling (both direction X and Y), the top of rotating mechanism is level reference and the double-shaft level instrument that digital output has been installed, the leveling precision is not more than 40 "; the leveling indication range is not more than ± and 5 °, the leveling data show on the display screen of controller with digital format.
Because the accelerometer output current is very little, the present invention adopts high-precision A/D change-over circuit to finish the test to little electric current, and the A/D change-over circuit has functions such as zero-bit and gain calibration, digital filtering, isolation amplification and is used to reduce zero-bit and problems such as gain drift, interference.Adopt 24 A/D conversion chips in the measuring instrument of the present invention, not only can satisfy the dynamic range requirement, and the more important thing is himself to possess zero point and gain calibration, program control amplification and digital filtering, greatly reduce the system design complicacy like this.Adopt 24 A/D change-over circuits, under the cooperation of externally soft, hardware, can fully improve system performance.
In order to satisfy the high-precision requirement of gravimetry instrument, the temperature control circuit design of measuring instrument comprises accelerometer temperature control and the temperature control of A/D change-over circuit.The inner metal flexible pendulous accelerometer that adopts of measuring instrument is very sensitive to temperature and thermograde; the measuring instrument internal temperature changes the precision that can directly influence the gravimetry instrument; for degree of will speed up meter is made isothermal body, the temperature control circuit form adopts the pulse-width-modulating type temperature control circuit that has overheating protection.Thermosensitive wire, temperature spot are adjusted resistance and are arranged in accelerometer and the A/D change-over circuit, thermosensitive wire, temperature spot are adjusted in resistance and the circuit two fixing brachium pontis composition measuring bridges, be used for the responsive temperature difference and output signal, delivering to the triangular wave of sending here with triangular-wave generator in the comparer after amplifying compares, produce control signal and deliver to the power amplifier level, the control heating plate power of heating reaches the purpose of constant temperature.The effect of thermal-shutdown circuit is when unexpected the generation, and accelerometer temperature interior or the A/D change-over circuit is too high, makes heating plate stop to heat, protection accelerometer or A/D change-over circuit.It around the accelerometer relatively complicated temperature field, in order to obtain good gravimetry precision at short notice, when accelerometer is carried out temperature control, studied the compensation schemes of accelerometer, accelerometer has linear relatively temperature coefficient in certain temperature space, at this temperature coefficient, adopt negative tempperature coefficient thermistor to carry out temperature compensation, make accelerometer deadweight electric current reduce with Temperature Influence.
The present invention simultaneously has one deck attemperator between the shell of accelerometer formula gravimetry instrument and inside subject.The initial insulation material of selecting is superwool
TMSpecial flexible insulant material, this material heat-insulating property is fine, gravimetry instrument test result at low temperatures is very desirable, but the gravimetry instrument is the environment for use (40 ℃～+ 40 ℃) of wide temperature, under the prerequisite of heat radiation of balance high temperature and low temperature insulation, insulation material is special space wadding, makes the fit heat-insulation layer that has thread gluing and is wrapped on the measuring instrument inside subject, under low temperature environment, adopt stay-warm case to cover the outside of gravimetry instrument shell in addition.
As shown in Figure 5, the flexible velograph of metal pendulum-type that the present invention adopts mainly comprises housing 51, flexibility bar 52, torquer moving-coil 53, the torquer stator of forming by yoke 56 and permanent magnet 57, the signal transducer of forming by signal transducer moving-coil 55 and signal transducer stator 54, triangle pendulum 58 and servoamplifier 59, be full of silicone oil as damping liquid in the housing 51, triangle pendulum 58, torquer moving-coil 53 is formed the pendulum assembly with signal transducer moving-coil 55, the center mounting torque device moving-coil 53 of triangle pendulum 58, signal transducer moving-coil 5 is installed on the top of triangle pendulum 58, the bottom connects two flexibility bars 52 makes the pendulum assembly be connected with instrument housing 51 elasticity, yoke 56 is fixed on the middle part of housing 51, permanent magnet 57 passes torquer moving-coil 53, torquer stator and torquer moving-coil 53 constitute torquer, signal transducer stator 54 is fixed on the housing 51 and to connect sensor excitatory, when acceleration is imported, the displacement of the responsive pendulum of signal transducer assembly also is converted into electric signal, electric signal exports servoamplifier 59 to by signal transducer moving-coil 55, servoamplifier 59 amplifies electric signal, feed back to torquer moving-coil 53 after the correction and produce feedback moment by torquer, this feedback moment makes the pendulum component recovery to the equilibrium position.
As shown in Figure 6, by pendulum 58, the pendulum assembly that sensor moving-coil 55 and flexibility bar 52 are formed is an activity system, its matrix is the pendulum 58 of a plane triangle, triangle pendulum 58 is an isosceles triangular structure, the pendulum center is left through hole and is used for mounting torque device moving-coil 53, form the push-pull type torquer with the permanent magnet 7 that is fixed on the housing, signal transducer moving-coil 55 is installed on the top of triangle pendulum 58, with field winding on ferrite be that sensor stator 54 is formed differential inductance transducers, the axis of sensor moving-coil and torquer coil is a quadrature in the space, the position, two base angles of pendulum 58 respectively sticks with glue a fixedly connected flexibility bar 52, supporting the pendulum assembly symmetrically, flexibility bar 2 is made by beryllium-bronze, triangle pendulum 58 leaves 1 pair of through hole at least in center line symmetria bilateralis position, pendulum assembly barycenter is called pendulum length (l) to the distance in flexibility bar joint, form detection quality (m) by the whole pendulum group quality between the sensor moving-coil 55 of flexibility bar 52 joints to pendulum group top installation, the product that detects quality and pendulum length is called pendulosity.The lower end of flexibility bar 52 is securely fixed on the pedestal by gluing again, can do small rotation (pact ± 10 ') round the flexibility bar joint by such structure pendulum assembly, and the operating angle of accelerometer only has the several seconds under closed-loop working state.As shown in Figure 7, the flexibility bar entire body is a cylindricality, middle symmetric position is processed into the circle of inflexions arc shape, make the rigidity of flexibility bar on the sensitive direction of accelerometer very little, be similar to be and freely do not have restrained condition, rigidity in the other direction is then very big, has improved performance and measuring accuracy and the antivibration and the shock proof ability of instrument.
The torquer that adopts is a voice coil loudspeaker voice coil differential type torquer, and a pair of torquer of forming differential type has identical structure, and the permanent magnet of two torquers is of the same name to the top, and permanent magnet material adopts 2: 17 SmCo magnet steel, and degree of stability can reach 10
-6/ month magnitude (1 σ), yoke and permanent magnet are separately fixed on the symmetric position of watchcase, form the differential type torquer with the torquer coil on the pendulum group, when adding the square electric current and flowing through the torquer coil, the power that two torquers produce superposes, and has improved the efficient of torquer and has reduced nonlinearity erron.
As shown in Figure 8, signal transducer adopts differential moving-coil structure, signal transducer is a movably transformer of a kind of secondary coil, when utilizing secondary coil to move and the variation of primary coil mutual inductance produce output voltage, its two groups of magnetizing coils are respectively on a pair of " c " shape FERRITE CORE, shown in Fig. 8 (a), two " c " shape FERRITE CORE breach relatively, the centre leaves the gap and be fixed on and form sensor stator on the stator seat, two groups of field windings are connected in series, winding mode winds the line by 11 to 31 to 41 at last to 21 shown in Fig. 8 (b).Be contained in the moving-coil on the pendulum assembly, can in stator gap, move along gauge outfit input shaft direction, the variation of follower ring relative stator position, the induced voltage of output out of phase and amplitude, thus detect the signal that the assembly diverse location is put in reflection.
Owing to be filled with methyl-silicone oil in the instrument, improved the antivibration ability of instrument and increased damping, but varied with temperature, the silicone oil volume changes, and for the variation of compensation silicone oil volume, the temperature compensation bellows is housed in the housing of instrument, housing is cylindrical or square, and wherein an end leaves oil-filled hole.The temperature compensation bellows is made by beryllium-bronze, can extend or shortens with the variation of silicone oil volume in the instrument.Temperature control element mainly comprises heating plate and the thermosensitive wire in the housing, and these elements and temperature control electric bridge are formed attemperating unit, and sensor is carried out thermostatic control, to improve the measuring accuracy and the parametric stability of instrument.The thermosensitive wire of attemperating unit is contained in the housing chamber, an arm as bridge for measuring temperature, when cavity temperature is lower than the working temperature of demarcation, bridge for measuring temperature is in non-equilibrium state, output signal feeds back to heating plate after by power amplifier again, the temperature of instrument is raise, be elevated to working temperature always, just stop when the bridge for measuring temperature of attemperating unit reaches equilibrium state.
Principle of work of the present invention is: the accelerometer of measuring instrument inside is installed on the two position rotating mechanisms, elder generation's leveling when demarcating the relative gravity acceleration of the three unities, output according to the double-shaft level instrument utilizes levelling device to carry out leveling, the intact back of leveling rotating mechanism will add table and forward to+position of 1g measure N
1g, measure the back dress actuation mechanism that finishes and do and will add table after the 180 degree upsets and forward to-the 1g position, measure N
-1g, can calculate the relative gravity acceleration K in this place according to following formula
1
Adopt said method, measure K at reference point
1After, measuring instrument arrives any measurement point and uses with the leveling of quadrat method elder generation and measure K again
1', because the output of accelerometer is directly proportional with acceleration of gravity, utilize the g of known point
0, calculate the g of any measurement point according to following formula
f
After known acceleration of gravity point was finished demarcation, the gravimetry instrument can motor-drivenly be measured the local gravitational acceleration value and finish automatic transmission to any measurement point.Test duration is short, and measurement point is to the gravity acceleration value that calibrates this place arbitrarily at random from capturing, and the time is less than 8min.Acceleration of gravity measuring error: be not more than 20mgal (3 σ).Portable part weight only needs operator 1 people just can realize measuring smaller or equal to 15kg.
The present invention not detailed description is a technology as well known to those skilled in the art.
Claims (7)
1. accelerometer formula relative gravity meter, its feature exists: comprise casing and controller two parts, power-switching circuit is installed in the casing, the double-shaft level instrument, two position rotating mechanisms, the metal flexible pendulous accelerometer, temperature control circuit, telemetry circuit and A/D change-over circuit, two position rotating mechanism levels are installed in the middle of the casing, be provided with a circular hole in the two position rotating mechanisms and be used to install the metal flexible pendulous accelerometer, make the balance staff of metal flexible pendulous accelerometer and the rotation axis of two position rotating mechanisms coincide, the double-shaft level instrument is fixedly mounted on the levelness that is used to measure two position rotating mechanisms on the two position rotating mechanisms, power-switching circuit connects external power supply and is used for to the double-shaft level instrument, two position rotating mechanisms, the metal flexible pendulous accelerometer, the temperature control circuit power supply, the temperature that temperature control circuit is used to control metal flexible pendulous accelerometer and A/D change-over circuit keeps constant, the control signal that telemetry circuit receives controller is used to control the two positions rotation that two position rotating mechanisms drive the metal flexible pendulous accelerometer, telemetry circuit control A/D change-over circuit is measured the output of metal flexible pendulous accelerometer and is carried out conversion of signals after two position rotating mechanisms rotate in place, the output signal of A/D change-over circuit is carried out the measurement result that computing obtains relative gravity by controller, described metal flexible pendulous accelerometer comprises housing (51), flexibility bar (52), torquer moving-coil (53), the torquer stator of forming by yoke (56) and permanent magnet (57), the signal transducer of forming by signal transducer moving-coil (55) and signal transducer stator (54), triangle pendulum (58) and servoamplifier (59), housing is full of damping liquid in (51), triangle pendulum (58), torquer moving-coil (53) is formed the pendulum assembly with signal transducer moving-coil (55), the center mounting torque device moving-coil (53) of triangle pendulum (58), signal transducer moving-coil (55) is installed on the top of triangle pendulum (58), the bottom connects two flexibility bars (52) makes the pendulum assembly be connected with housing (51) elasticity, yoke (56) is fixed on the middle part of housing (51), permanent magnet (57) passes torquer moving-coil (53), torquer stator and torquer moving-coil (53) constitute torquer, signal transducer stator (54) is fixed on that housing (51) is gone up and it is excitatory to connect sensor, when acceleration is imported, signal transducer is measured the displacement of pendulum assembly and is converted into electric signal, electric signal exports servoamplifier (59) to by signal transducer moving-coil (55), servoamplifier (59) amplifies electric signal, feed back to torquer moving-coil (53) after the correction and produce feedback moment by torquer, this feedback moment makes the pendulum component recovery to the equilibrium position; Described casing is equipped with the leveling support outward, and this leveling support is made up of installing plate and three adjustable taper supporting legs; Described two position rotating mechanisms comprise turntable stage body (41), retaining nail (44), servomotor (43) and gear set (45), retaining nail (44), servomotor (43) and gear set (45) are installed on the turntable stage body (41), leave the circular hole (42) that is used to install accelerometer in the gear set (45), the center of circular hole (42) is the rotation axis of two position rotating mechanisms, during turntable work, servomotor (43) driven gear group (45) goes up at stage body (41) together with accelerometer and rotates, and gear set (45) stops operating when retaining is followed closely (44) whenever and finishes the conversion of two positions.
2. a kind of accelerometer formula relative gravity meter according to claim 1, its feature exists: in the described casing lithium battery is installed, lithium battery is its charging by power-switching circuit, is double-shaft level instrument, two position rotating mechanisms, metal flexible pendulous accelerometer, temperature control circuit power supply by lithium battery when casing does not have external power supply.
3. a kind of accelerometer formula relative gravity meter according to claim 1 and 2, its feature exists: described flexibility bar (52) entire body is a cylindricality, and middle symmetric position is processed into the circle of inflexions arc shape.
4. a kind of accelerometer formula relative gravity meter according to claim 1 and 2, its feature exists: described triangle pendulum (58) is a plane isosceles triangle shape, triangle pendulum (58) center is left through hole and is used for mounting torque device moving-coil (53), signal transducer moving-coil (55) is installed on the top of triangle pendulum (58), and position, two base angles respectively connects a flexibility bar (52).
5. a kind of accelerometer formula relative gravity meter according to claim 1 and 2, its feature exists: described triangle pendulum (58) leaves 1 pair of through hole at least in center line symmetria bilateralis position.
6. a kind of accelerometer formula relative gravity meter according to claim 1 and 2, its feature exists: described casing is made up of inner housing and shell body, loads flexible insulant material between inner housing and the shell body.
7. a kind of accelerometer formula relative gravity meter according to claim 6, its feature exists: described flexible insulant material is a space wadding.
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| CN112213796B (en) * | 2020-09-17 | 2021-09-28 | 北京大学 | Absolute gravity measurement method and absolute gravimeter |
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| CN112698416B (en) * | 2020-12-16 | 2022-05-03 | 湖南航天机电设备与特种材料研究所 | Gravitational acceleration measuring method and system suitable for strapdown inertial navigation system |
| CN112885203B (en) * | 2021-03-01 | 2022-04-22 | 河南大学 | Gravity acceleration measuring device based on rotational inertia |
| CN113311495B (en) * | 2021-05-31 | 2022-07-19 | 武汉大学 | Method and system for indirectly measuring gravity |
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