Zero setting device of force balance accelerometer and force balance accelerometer

Abstract

The embodiment of the invention provides a zero setting device of a force balance accelerometer and the force balance accelerometer, the zero setting device comprises a zero setting mechanism, the zero setting mechanism comprises a driving unit and a transmission unit, the driving unit is connected with one end of a spring through the transmission unit, and the other end of the spring is connected with a movable pole plate; the control unit is connected with the control end of the driving unit and is connected with the control end of a switch for controlling the on-off of the feedback circuit; when the zero-point voltage of the force balance accelerometer is detected to be not in a preset zero-point voltage standard range, the control switch disconnects the feedback circuit, calculates a coarse adjustment parameter according to the zero-point voltage, the distance between the movable pole plate and the fixed pole plate, the voltage applied to the movable pole plate, the amplification factor of the feedback circuit and the environment temperature, and controls the driving unit to act according to the coarse adjustment parameter. The transmission unit drives the spring to act to adjust the position of the movable pole plate, and the control switch is connected with the feedback circuit after adjustment. The zero adjustment difficulty and the zero adjustment time can be reduced, the zero adjustment precision is improved, and the measurement precision of the instrument is ensured.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of earthquake observation, and in particular to a zeroing device for a force-balanced accelerometer and a force-balanced accelerometer. Background Art

[0002] The force balance accelerometer is a high-precision sensor used to sense the acceleration of ground motion and is widely used in strong earthquake observation. Affected by environmental factors such as temperature and air pressure, the force balance accelerometer will have zero drift. In order to ensure its normal working state, it needs to be zeroed regularly. There are currently two main ways to zero. One is mechanical zeroing, which reserves a zeroing port on the instrument and manually turns the zeroing shaft to achieve zeroing. The assembly cost is high, and zeroing is difficult and the maintenance cost is high in special installation environments. The instrument is prone to moisture and malfunctions due to the inability to seal. The other is current zeroing, which generates a DC current to act on the feedback coil to form a reaction force to achieve zeroing. Since there is noise in the generated DC current, the accuracy of the accelerometer is affected. Summary of the invention

[0003] In view of this, an object of the embodiments of the present application is to provide a zeroing device for a force-balance accelerometer and a force-balance accelerometer to solve the zeroing problem of the force-balance accelerometer.

[0004] Based on the above purpose, an embodiment of the present application provides a zeroing device for a force balance accelerometer, comprising:

[0005] The zero adjustment mechanism comprises a driving unit and a transmission unit, wherein the driving unit is connected to one end of a spring through the transmission unit, and the other end of the spring is connected to a moving electrode plate;

[0006] A control unit is connected to the control end of the driving unit and to the control end of a switch for controlling the on and off of a feedback circuit; when the zero-point voltage of the detection force balance accelerometer is not within a preset zero-point voltage standard range, the switch is controlled to disconnect the feedback circuit, and a coarse adjustment parameter is calculated according to the zero-point voltage, the distance between the moving electrode plate and the fixed electrode plate, the voltage applied to the moving electrode plate, the amplification factor of the feedback circuit and the ambient temperature, and the driving unit is controlled to move according to the coarse adjustment parameter, the spring is driven to move by the transmission unit, the position of the moving electrode plate is adjusted, and after the adjustment, the switch is controlled to connect the feedback circuit.

[0007] Optionally, the driving unit includes a stepping motor and a reducer; the coarse adjustment parameter is calculated according to the zero point voltage, the distance between the moving electrode plate and the fixed electrode plate, the voltage applied to the moving electrode plate, the amplification factor of the feedback circuit and the ambient temperature, and the method is as follows:

[0008]

[0009] in, For coarse adjustment of the angle, U O is the zero point voltage, D is the distance between the moving plate and the leveling plate, U M is the peak-to-peak value of the sinusoidal voltage applied to the moving plate, G is the amplification factor of the feedback circuit, d is the stroke of the moving plate when the stepper motor rotates one degree, T is the ambient temperature, and β is the coefficient of influence of temperature on the plate.

[0010] Optionally, the control unit is also used to adjust the position of the moving electrode plate according to the coarse adjustment parameter, and when the zero point voltage of the detection force balance accelerometer is not within the zero point voltage standard range, determine the fine adjustment parameter based on the voltage adjusted when the stepper motor rotates one degree and the preset number of rotations, and control the action of the drive unit according to the fine adjustment parameter.

[0011] Optionally, the fine-tuning parameter is determined according to the voltage amount adjusted when the stepper motor rotates one degree and the preset number of rotations, and the method is:

[0012]

[0013] in, To fine-tune the angle, U i is the zero-point voltage detected after the stepper motor rotates for the i-th time, U i-1 is the zero-point voltage detected after the stepper motor rotates for the i-1th time, U n It is the zero point voltage detected after the stepper motor rotates for the nth time.

[0014] Optionally, the preset number of rotations is determined according to the zeroing time and zeroing accuracy.

[0015] Optionally, the control unit is also used to, after adjusting the position of the moving electrode plate according to the fine-tuning parameters, repeat the process of determining the fine-tuning parameters to fine-tune the position of the moving electrode plate when the zero-point voltage of the detection force balance accelerometer is not within the zero-point voltage standard range, until the detected zero-point voltage is within the zero-point voltage standard range.

[0016] Optionally, the control unit is used to detect the zero point voltage of the force balance accelerometer after receiving a zero adjustment instruction.

[0017] Optionally, the transmission unit includes a turbine and a worm, one end of the worm is connected to one end of the spring, and the stepper motor and the reducer are operated to drive the spring to expand and contract through the turbine and the worm, thereby adjusting the position of the moving pole plate.

[0018] The embodiment of the present application also provides a force balance accelerometer, comprising the zeroing device as described above.

[0019] From the above description, it can be seen that the zeroing device of the force balance accelerometer and the force balance accelerometer provided in the embodiment of the present application adopt a zeroing mechanism of a stepping motor, a reducer, and a worm gear structure, which can reduce the zeroing torque, reduce the difficulty and cost of zeroing, and can achieve rapid zeroing in a remote manner according to the installation environment of the instrument, thereby reducing the difficulty of maintenance and the time for zeroing. When zeroing, a feedback-free method of coarse adjustment followed by fine adjustment is adopted, which can achieve accurate zeroing in harsh environments, improve the adaptability of the instrument, and ensure the measurement accuracy of the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 is a schematic diagram of a force balance accelerometer according to some embodiments;

[0022] Figure 2 is a schematic diagram of the principle of mechanical zeroing of some embodiments;

[0023] Figure 3 It is a structural block diagram of the zero adjustment device according to an embodiment of the present application;

[0024] Figure 4 A schematic diagram of the structure of the zero adjustment mechanism of an embodiment of the present application;

[0025] Figure 5 A schematic diagram of a zeroing method flow chart of an embodiment of the present application;

[0026] Figure 6 A partial structural schematic diagram of a force balance accelerometer according to an embodiment of the present application;

[0027] Figure 7 FIG. 1 is a partial structural diagram of a force balance accelerometer according to another embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0029] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] like Figure 1 As shown, in the related art, the force balance accelerometer includes a mass block, a capacitor plate, a demodulation circuit, a feedback circuit, a proportional differential circuit, etc. The capacitor plate includes a moving plate and a fixed plate. The moving plate includes an upper plate and a lower plate. The fixed plate is located in the middle of the upper plate and the lower plate. The mass block is connected to the upper and lower plates through a spring, and a sinusoidal voltage with the same amplitude and opposite direction is applied to the upper and lower plates. When the fixed plate is located in the middle between the upper and lower plates, the output voltage is 0. When the ground vibrates, the position of the mass block changes, and the upper and lower plates are driven by the spring to move relative to each other. The voltage output by the fixed plate is amplified and demodulated by the demodulation circuit to output an output voltage proportional to the acceleration; on the one hand, the output voltage generates a feedback force in the opposite direction of the vibration of the moving plate through the feedback coil to hinder the vibration of the moving plate, and on the other hand, it is output after passing through a proportional differential circuit composed of a proportional resistor and a differential capacitor. Among them, the transfer function of the force balance accelerometer can be expressed as:

[0031]

[0032] Among them, Gd is the electromechanical constant, which is determined by the sinusoidal voltage, the distance between the plates, and the amplifier's amplification factor; D is the mechanical pendulum damping, ω m is the natural angular frequency of the mechanical pendulum, E is the electromagnetic constant, C is the differential capacitance, M is the mass of the mechanical pendulum, and R is the proportional resistance.

[0033] Before the force balance accelerometer is put into operation for the first time, it needs to be zeroed to ensure that it is in normal working condition. During use, due to environmental factors such as temperature and air pressure, the force balance accelerometer will experience zero drift, and it is difficult to ensure that its fixed electrode plate is always in the middle position between the upper and lower plates, that is, it is difficult to ensure that it is always in the zero position. Therefore, it is necessary to zero it regularly to ensure the measurement accuracy of the instrument.

[0034] like Figure 2 As shown, mechanical zeroing uses the lever principle to adjust the zero point. The first rigid body 20 is connected to the moving plate through a spring 25, and the second rigid body 21 is connected to the fixed plate. The first rigid body 20 and the second rigid body 21 are connected through an adjusting rod 22 and an elastic expansion piece 23. The length of the elastic expansion piece 23 can be changed by rotating the adjusting screw 24. The slender adjusting rod 22 can be deformed with the deformation of the elastic expansion piece 23, thereby changing the relative height of the first rigid body and the second rigid body, so as to achieve the purpose of adjusting the position of the upper and lower plates and realize zeroing. In order to reduce the influence of the material's own deformation and the factors such as temperature and air pressure, the hardness of the adjusting rod is very high, and the zeroing torque must reach more than 8 times the full range of the accelerometer, that is, more than 16G to achieve zeroing, which is quite difficult.

[0035] Current zeroing requires the generation of a DC voltage through a digital-to-analog converter, which is then divided by a resistor to obtain the required DC current that acts on the feedback coil, forming a reaction force on the plate to achieve zeroing. Even with a high-precision digital-to-analog converter, the generated DC voltage still has noise, which acts on the coil, greatly increasing the noise of the accelerometer and reducing the measurement accuracy of the instrument.

[0036] In view of this, the present application provides a zeroing device for a force balance accelerometer, including a zeroing mechanism and a control unit. The zeroing mechanism adopts a stepping motor, a reducer and a worm gear structure, which can reduce the adjustment torque and reduce the difficulty of zeroing. The control unit controls the zeroing mechanism to perform coarse and fine adjustments on the position of the electrode plate in sequence, so as to accurately adjust it to the zero position without introducing additional noise, thereby ensuring the measurement accuracy of the force balance accelerometer.

[0037] The technical solution of the present application is further described in detail below through specific embodiments.

[0038] like Figure 3 , 4 As shown, the present application provides a zeroing device for a force balance accelerometer, comprising:

[0039] The zero adjustment mechanism comprises a driving unit and a transmission unit, wherein the driving unit is connected to one end of a spring through the transmission unit, and the other end of the spring is connected to a moving electrode plate;

[0040] The control unit is connected to the control end of the driving unit and to the control end of the switch for controlling the on and off of the feedback circuit; when the zero point voltage of the detection force balance accelerometer is not within the preset zero point voltage standard range, the control switch disconnects the feedback circuit, and calculates the coarse adjustment parameters according to the zero point voltage, the distance between the moving electrode plate and the fixed electrode plate, the voltage applied to the moving electrode plate, the amplification factor of the feedback circuit and the ambient temperature, and controls the action of the driving unit according to the coarse adjustment parameters, drives the spring to act through the transmission unit, adjusts the position of the moving electrode plate, and after the adjustment, controls the switch to connect the feedback circuit.

[0041] The zeroing device provided in this embodiment includes a control unit and a zeroing mechanism installed on the force balance accelerometer. The zeroing mechanism includes a driving unit and a transmission unit. The rigid body 36 of the force balance accelerometer is fixedly connected to the driving unit. The driving end of the driving unit is connected to one end of the spring 34 through the transmission unit. The other end of the spring 34 is connected to the moving electrode plate 35. The control signal output end of the control unit is connected to the control end of the driving unit. The control unit can control the action of the driving unit, drive the spring to move through the transmission unit, and then drive the moving electrode plate to move. The zeroing purpose is achieved by adjusting the position of the moving electrode plate.

[0042] In some embodiments, in order to realize the miniaturization design of the force balance accelerometer and realize the precise zeroing function, a zeroing structure combination of a small stepping motor, a reducer, and a worm gear is selected. The driving unit includes a stepping motor 30 and a reducer 31, and the transmission unit includes a turbine 32 and a worm gear 33. The driving unit and the transmission unit of this structure can effectively reduce the torque, reduce the difficulty of zeroing, and reduce the cost.

[0043] Due to the reduction of zeroing torque, the force balance accelerometer is a deep negative feedback system. Under the action of feedback force, the spring 34 will rotate with the worm 33, resulting in the rotation stroke of the moving pole plate 35 not being equal to the rotation stroke of the worm 33, affecting the zeroing accuracy. To solve this problem, this embodiment adopts a zeroing method without feedback. During zeroing, the control unit controls the switch on the feedback circuit path to be disconnected to cut off the feedback circuit, so that the spring is in a free expansion and contraction state during zeroing, ensuring that the stroke of the moving pole plate is equal to the rotation stroke of the worm, and then accurately adjusting the position of the moving pole plate by driving the worm. After zeroing, the control unit controls the switch to connect the feedback circuit to ensure the normal function of the accelerometer.

[0044] In some embodiments, according to relevant regulations, the standard range of the zero voltage should be less than 10mV, that is, the zero voltage needs to be adjusted to within the standard range of the zero voltage. In order to achieve accurate zero adjustment, this embodiment adopts a method of coarse adjustment first and then fine adjustment, that is, coarse adjustment is first performed during zero adjustment. If the zero voltage is still not within the standard range of the zero voltage after coarse adjustment, fine adjustment is continued. After one or several fine adjustments, the zero voltage is adjusted to within the standard range of the zero voltage.

[0045] Specifically, during the coarse adjustment, the control unit uses the voltage acquisition circuit to collect the zero-point voltage output by the accelerometer. If the zero-point voltage is not within the standard range of the zero-point voltage, the control switch disconnects the feedback circuit, and the coarse adjustment parameters are calculated according to the zero-point voltage, the distance between the moving electrode plate and the fixed electrode plate, the voltage applied to the moving electrode plate, the amplification factor of the feedback circuit, and the ambient temperature. The drive unit is controlled to move according to the coarse adjustment parameters, and the spring is driven by the transmission unit to adjust the position of the moving electrode plate. After the adjustment, the control switch connects the feedback circuit. That is, during the coarse adjustment, the feedback circuit is disconnected first to ensure that the spring is in a free expansion and contraction state during the zero adjustment process, and then the drive unit is controlled to move according to the calculated coarse adjustment parameters to drive the transmission unit to move and adjust the position of the moving electrode plate. After the coarse adjustment, the feedback circuit is connected.

[0046] In some methods, the coarse adjustment parameters are calculated according to the zero point voltage, the distance between the moving electrode plate and the fixed electrode plate, the voltage applied to the moving electrode plate, the amplification factor of the feedback circuit and the ambient temperature, and the method is as follows:

[0047]

[0048] in, For coarse adjustment of the angle, U O is the zero point voltage, D is the distance between the moving plate and the grading plate, which can be 0.3mm, U M is the peak-to-peak value of the sinusoidal voltage applied to the moving plate, G is the amplification factor of the feedback circuit, d is the stroke of the moving plate when the stepper motor rotates one degree, T is the ambient temperature, and β is the coefficient of influence of temperature on the plate.

[0049] In some embodiments, the control unit is also used to adjust the position of the moving electrode according to the coarse adjustment parameters, and when the zero point voltage of the detection force balance accelerometer is not within the standard range of the zero point voltage, determine the fine adjustment parameters based on the voltage adjusted for one degree of rotation of the stepper motor and the preset number of rotations, and control the action of the drive unit according to the fine adjustment parameters.

[0050] In this embodiment, after coarse adjustment, the control unit uses the voltage acquisition circuit to collect the zero-point voltage output by the accelerometer. If the zero-point voltage is still not within the standard range of the zero-point voltage, the control switch disconnects the feedback circuit, and determines the fine-tuning parameters based on the voltage adjusted by one rotation of the stepper motor and the preset number of rotations. The drive unit is controlled according to the fine-tuning parameters, and the position of the moving electrode is continued to be adjusted through the transmission of the transmission unit. After the adjustment, the control switch connects the feedback circuit.

[0051] In some embodiments, the fine adjustment parameter is determined based on the voltage amount adjusted by one rotation of the stepper motor and a preset number of rotations, and the method is as follows:

[0052]

[0053] in, To fine-tune the angle, U i is the zero-point voltage detected after the stepper motor rotates for the i-th time, U i-1 is the zero-point voltage detected after the stepper motor rotates for the i-1th time, U n It is the zero-point voltage detected after the stepper motor rotates for the nth time. n is the number of rotations, which can be determined according to the zero adjustment time and zero adjustment accuracy. The more rotations, the higher the zero adjustment accuracy and the longer the required zero adjustment time. On the contrary, the fewer rotations, the lower the zero adjustment accuracy and the shorter the required zero adjustment time. In practical applications, the appropriate number of rotations can be selected to balance the zero adjustment time and zero adjustment accuracy.

[0054] The fine adjustment method is to control the stepper motor to rotate a predetermined number of times for a short distance and a small stroke. After each rotation, the corresponding zero-point voltage is obtained. The change value of the zero-point voltage of the stepper motor rotates one degree is calculated by summing and averaging, and then the fine adjustment angle is obtained. Optionally, the stepper motor is controlled to rotate one degree every 500ms. Considering the zero adjustment time and accuracy, the number of rotations can be set to 30 times, and 30 zero-point voltages can be obtained. According to the 30 zero-point voltage values, the fine adjustment angle is calculated according to Formula 3. The zero adjustment time required to adjust to the zero position state is less than 30 seconds.

[0055] In some embodiments, the control unit is also used to repeat the process of determining the fine-tuning parameters to fine-tune the position of the moving electrode plate after adjusting the position of the moving electrode plate according to the fine-tuning parameters, when the zero-point voltage of the detection force balance accelerometer is not within the standard range of the zero-point voltage, until the detected zero-point voltage is within the standard range of the zero-point voltage.

[0056] In this embodiment, after the first fine adjustment, the control unit uses the voltage acquisition circuit to collect the zero voltage output by the accelerometer. If the zero voltage is still not within the standard range of the zero voltage, the control switch disconnects the feedback circuit, determines the fine adjustment parameters, controls the drive unit to act according to the fine adjustment parameters, and continues to adjust the position of the moving electrode plate through the transmission of the transmission unit. After the adjustment, the control switch connects the feedback circuit. That is, if the zero adjustment is not achieved in one fine adjustment, the fine adjustment process can be repeated for multiple times until the zero position state is adjusted.

[0057] Among them, the first coarse adjustment is to achieve rapid zeroing without considering external interference. If the accelerometer is in a stable environment, zeroing can generally be completed. If it is in an interference environment such as rain, strong wind, strong magnetic field, or vehicles passing nearby, these interference factors will be transmitted to the accelerometer through the ground, causing the accelerometer to move slightly. At this time, a second fine adjustment is required, and even multiple fine adjustments may be required until the zero position is reached (generally, the zero position can be reached after one fine adjustment).

[0058] like Figure 5As shown, the process of zeroing using the zeroing device of the present application includes: the control unit receives the zeroing instruction, uses the voltage acquisition circuit to acquire the zero-point voltage output by the accelerometer, determines whether the zero-point voltage is within the standard range of the zero-point voltage, ends the zeroing if it is, disconnects the feedback circuit if it is not, calculates the coarse adjustment parameter, controls the action of the drive unit according to the coarse adjustment parameter, drives the moving plate to adjust to the zero position through the transmission unit, and connects the feedback circuit after the adjustment. After the coarse adjustment, the zero-point voltage output by the accelerometer is acquired using the voltage acquisition circuit, determines whether the zero-point voltage is within the standard range of the zero-point voltage, ends the zeroing if it is, disconnects the feedback circuit if it is not, calculates the fine adjustment parameter, controls the action of the drive unit according to the fine adjustment parameter, drives the moving plate to adjust to the zero position through the transmission unit, and connects the feedback circuit after the adjustment. After the first fine-tuning, the zero-point voltage output by the accelerometer is collected to determine whether the zero-point voltage is within the standard range of the zero-point voltage. If not, the feedback circuit is disconnected, the fine-tuning parameters are calculated, the drive unit is controlled according to the fine-tuning parameters, and the driving plate is driven to adjust to the zero-point position through the transmission unit. After the adjustment, the feedback circuit is connected and the fine-tuning process is repeated multiple times until the zero-point voltage is within the standard range of the zero-point voltage, and the zero adjustment is completed.

[0059] In some embodiments, when zeroing is required, a seismic data collector is used to send a zeroing instruction to the control unit. According to the application scenario of the instrument, the zeroing instruction can be sent wirelessly (for example, the zeroing instruction is sent for a certain period of time), or the zeroing instruction can be sent through a serial port. Zeroing can be achieved remotely to reduce the difficulty of zeroing and improve maintainability. The voltage acquisition circuit can use a high-precision resistor divider network and a high-precision analog-to-digital converter to collect the zero-point voltage of the accelerometer. In some embodiments, the output voltage range of the accelerometer is ±5V, and the output voltage is stepped down to the reference voltage range of the 24-bit high-precision analog-to-digital converter (e.g., 0-2.5V) by a high-precision, low-temperature drift resistor divider network. The 24-bit high-precision analog-to-digital converter collects the voltage value and sends it to the control unit. The control unit obtains the zero-point voltage after median filtering based on the voltage values ​​received multiple times.

[0060] The zeroing device of the force balance accelerometer provided in the embodiment of the present application adopts a zeroing mechanism of a stepping motor, a reducer, and a worm gear structure, which can reduce the zeroing torque, reduce the difficulty and cost of zeroing; according to the installation environment of the instrument, a remote method can be used to achieve rapid zeroing, reducing the difficulty of maintenance; when zeroing, a feedback-free method of first coarse adjustment and then fine adjustment is adopted, which can achieve accurate zeroing in harsh environments, improve the adaptability of the instrument, and ensure the measurement accuracy of the instrument.

[0061] like Figure 6 , 7As shown, in some embodiments, the force balance accelerometer includes a base 4, on which a plurality of hexagonal screws 1 are installed for horizontal adjustment, and a level bubble 10 is installed on the top plate for observing the horizontal state of the instrument. The base 4 is connected to the top plate through a tripod 11 arranged at 120 degrees, and three mechanical pendulums arranged at 120 degrees are installed on the base 4. Each mechanical pendulum is equipped with a corresponding zero adjustment device, and the rigid body of the mechanical pendulum is fixedly connected to the stepper motor 14, the reducer 13, the turbine 5, and the worm 6. The worm 6 is connected to the pole plate 15 through the spring 3. The output end of the fixed pole plate of the mechanical pendulum is connected to the feedback circuit, and the feedback circuit is realized based on the control circuit board 2. The feedback circuit amplifies and demodulates the output voltage of the mechanical pendulum, and then inputs the feedback coil 12 through the output end of the operational amplifier to form a feedback force. At the same time, the voltage output from the output end of the operational amplifier forms an output signal after passing through the proportional differential circuit, and is uploaded to the host computer through the aviation plug 9. The control unit 7 is used to realize functions such as zero-point voltage detection and zero adjustment, and the control circuit 8 is used to realize functions such as power conversion, serial port communication, and uploading the collected vibration signal to the host computer through the aviation plug 9.

[0062] In some embodiments, in order to reduce costs and meet the requirements of miniaturized applications, the size of the stepper motor is 39mm×29mm, a small stepper motor with a torque of 0.24N and a step pitch of 0.9 degrees is selected, the size of the reducer is 40mm×50mm, and the reduction ratio is 1: 100. The power supply circuit of the force balance accelerometer can provide ±12V, ±6V, 3.3V, and 2.5V power supply voltages for the normal operation of each module.

[0063] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. Based on the concept of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0064] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power supply / ground connection with the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented in the embodiments of the present application (that is, these details should be fully within the scope of understanding of those skilled in the art). In the case of elaborating specific details (e.g., circuits) to describe exemplary embodiments of the present disclosure, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0065] Although the present disclosure has been described in conjunction with specific embodiments of the present disclosure, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0066] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present disclosure.

Claims

1. A zeroing device for a force balance accelerometer, characterized in that: include: The zero adjustment mechanism comprises a driving unit and a transmission unit, wherein the driving unit is connected to one end of a spring through the transmission unit, and the other end of the spring is connected to a moving electrode plate; A control unit is connected to the control end of the driving unit and to the control end of a switch for controlling the on and off of a feedback circuit; when the zero-point voltage of the detection force balance accelerometer is not within a preset zero-point voltage standard range, the switch is controlled to disconnect the feedback circuit, and a coarse adjustment parameter is calculated according to the zero-point voltage, the distance between the moving electrode plate and the fixed electrode plate, the voltage applied to the moving electrode plate, the amplification factor of the feedback circuit and the ambient temperature, and the driving unit is controlled to move according to the coarse adjustment parameter, the spring is driven to move by the transmission unit, the position of the moving electrode plate is adjusted, and after the adjustment, the switch is controlled to connect the feedback circuit.

2. The zero adjustment device according to claim 1, characterized in that: The driving unit includes a stepping motor and a reducer; the coarse adjustment parameter is calculated according to the zero point voltage, the distance between the moving electrode plate and the fixed electrode plate, the voltage applied to the moving electrode plate, the amplification factor of the feedback circuit and the ambient temperature, and the method is as follows: in, For coarse adjustment of the angle, U O is the zero point voltage, D is the distance between the moving plate and the leveling plate, U M is the peak-to-peak value of the sinusoidal voltage applied to the moving plate, G is the amplification factor of the feedback circuit, d is the stroke of the moving plate when the stepper motor rotates one degree, T is the ambient temperature, and β is the coefficient of influence of temperature on the plate.

3. The zero adjustment device according to claim 2, characterized in that: The control unit is also used to adjust the position of the moving electrode plate according to the coarse adjustment parameters, and when the zero point voltage of the detection force balance accelerometer is not within the standard range of the zero point voltage, determine the fine adjustment parameters based on the voltage adjusted by one degree of rotation of the stepper motor and the preset number of rotations, and control the action of the drive unit according to the fine adjustment parameters.

4. The zero adjustment device according to claim 3, characterized in that: The method for determining the fine adjustment parameters according to the voltage amount adjusted by one rotation of the stepper motor and the preset number of rotations is as follows: in, To fine-tune the angle, U i is the zero-point voltage detected after the stepper motor rotates for the i-th time, U i-1 is the zero-point voltage detected after the stepper motor rotates for the i-1th time, U n It is the zero point voltage detected after the stepper motor rotates for the nth time.

5. The zero adjustment device according to claim 3 or 4, characterized in that: The preset number of rotations is determined according to the zeroing time and the zeroing accuracy.

6. The zero adjustment device according to claim 3 or 4, characterized in that: The control unit is also used to repeat the process of determining the fine-tuning parameters to fine-tune the position of the moving electrode plate after adjusting the position of the moving electrode plate according to the fine-tuning parameters, when the zero-point voltage of the force balance accelerometer is not within the standard range of the zero-point voltage, until the detected zero-point voltage is within the standard range of the zero-point voltage.

7. The zero adjustment device according to claim 1, characterized in that: The control unit is used to detect the zero point voltage of the force balance accelerometer after receiving the zero adjustment instruction.

8. The zero adjustment device according to claim 1, characterized in that: The transmission unit includes a turbine and a worm, one end of the worm is connected to one end of the spring, the stepper motor and the reducer are operated, the turbine and the worm drive the spring to expand and contract, and the position of the moving pole plate is adjusted.

9. A force balance accelerometer, characterized in that: The invention comprises a zeroing device as claimed in any one of claims 1 to 8.

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