CN113495231A - Zero-bias-temperature-drift-free direct-current magnetic field measurement system and method - Google Patents
Zero-bias-temperature-drift-free direct-current magnetic field measurement system and method Download PDFInfo
- Publication number
- CN113495231A CN113495231A CN202111059061.1A CN202111059061A CN113495231A CN 113495231 A CN113495231 A CN 113495231A CN 202111059061 A CN202111059061 A CN 202111059061A CN 113495231 A CN113495231 A CN 113495231A
- Authority
- CN
- China
- Prior art keywords
- magnetic field
- measurement
- field sensor
- measurement result
- controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/007—Environmental aspects, e.g. temperature variations, radiation, stray fields
- G01R33/0082—Compensation, e.g. compensating for temperature changes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
- G01R33/0035—Calibration of single magnetic sensors, e.g. integrated calibration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
Abstract
The invention discloses a direct current magnetic field measuring system and method without zero bias temperature drift, the system includes: the controller is used for generating a first measurement instruction based on the received measurement operation and controlling the magnetic field sensor to move to the target direction; the magnetic field sensor is used for measuring a magnetic field to be measured based on the first measurement instruction to obtain a first measurement result; a controller for controlling the magnetic field sensor to move to a direction opposite to the target direction based on the first measurement result and generating a second measurement instruction; the magnetic field sensor is also used for measuring the magnetic field to be measured based on the second measurement instruction to obtain a second measurement result; and the controller is also used for obtaining a deviation removing measurement result based on the first measurement result and the second measurement result. The invention can almost eliminate all system errors of a measuring system and a sensor, such as zero offset, system offset, inherent errors, zero temperature drift, long-term drift, even flicker noise (1/f) and the like, and only the gain temperature drift cannot be eliminated.
Description
Technical Field
The invention relates to the technical field of physical quantity measurement, in particular to a zero-bias temperature drift-free direct-current magnetic field measurement system and method.
Background
For a linear measurement system of magnetic field, the measured electrical signal Sc is in a linear relationship with the original physical signal Sw, that is: sc = kSw + a, where k is the gain of the entire measurement system, including the sensitivity of the sensor; a is the zero offset of the entire measurement system, including the zero offset drift of the sensor. Commonly referred to in the industry as OFFSET. Since k and A are both temperature (t) dependent and are functions of temperature, typically quadratic polynomial functions of temperature, the above equation can be written as follows including temperature dependent relationships: sc = k (t) Sw + a (t). This relationship is readily determined if the gains k (t) and zero offset a (t) do not vary with temperature. The two coefficients can be determined by simply calibrating the actual signal at two points. In practice, however, both coefficients vary with temperature, and the temperature profile of both coefficients varies with increasing aging of the measurement system. Therefore, how to eliminate the temperature-dependent variation of the two coefficients, i.e., how to eliminate the gain temperature drift and the zero bias temperature drift, has been the target of struggling and efforts of the measurement world and sensor manufacturers.
In the related art, a measurement method is disclosed, in which a temperature sensor is placed in a magnetic field sensor, then different temperatures are respectively calibrated, and finally, thermometer lattice data are formed and stored for real-time correction.
However, when the existing method is adopted to measure the magnetic field to be measured, zero offset temperature drift is difficult to eliminate, so that the accuracy of the measurement result is low.
Disclosure of Invention
The invention mainly aims to provide a zero-bias temperature drift-free direct-current magnetic field measurement system and method, and aims to solve the technical problem that in the prior art, when a magnetic field to be measured is measured by using the conventional method, zero-bias temperature drift is difficult to eliminate, so that the accuracy of a measurement result is low.
In order to achieve the aim, the invention provides a direct-current magnetic field measuring system without zero bias temperature drift, which comprises a magnetic field sensor and a controller which are connected; the magnetic field sensor is arranged in a magnetic field to be measured;
the controller is used for generating a first measurement instruction based on the received measurement operation and controlling the magnetic field sensor to move to a target direction;
the magnetic field sensor is used for measuring the magnetic field to be measured based on the first measurement instruction to obtain a first measurement result;
the controller is used for controlling the magnetic field sensor to move to the direction opposite to the target direction based on the first measurement result and generating a second measurement instruction;
the magnetic field sensor is further configured to measure the magnetic field to be measured based on the second measurement instruction, so as to obtain a second measurement result;
the controller is further configured to obtain a depolarization measurement result based on the first measurement result and the second measurement result.
Alternatively to this, the first and second parts may,
the controller is further configured to calculate a measurement difference between the first measurement and the second measurement; and obtaining the depolarization measurement result based on the measurement difference.
Optionally, the system further comprises a direction control device; the direction control device is connected with the controller and fixedly connected with the magnetic field sensor;
the controller is further used for obtaining a first control instruction based on the measurement operation;
and the direction control device is used for controlling the magnetic field sensor to move to a target direction based on the first control instruction.
Alternatively to this, the first and second parts may,
the controller is further used for obtaining a second control instruction based on the first measurement result;
the direction control device is further configured to control the magnetic field sensor to move to a direction opposite to the target direction based on the second control instruction.
Optionally, the direction control device comprises a motor and a connecting rod;
an output shaft of the motor is connected with the connecting rod, and the connecting rod is fixedly connected with the magnetic field sensor;
the motor is used for rotating according to a first preset direction based on the first control instruction, so that the connecting rod drives the magnetic field sensor to move to a target direction.
Alternatively to this, the first and second parts may,
the motor is further configured to rotate in a second preset direction based on the second control instruction, so that the connecting rod drives the magnetic field sensor to move to a direction opposite to the target direction.
Optionally, the direction control device further comprises a limiting component, and the connecting rod is provided with a positioning component;
the limiting component is used for limiting the positioning component to move to a first target position when the positioning component rotates in a first preset direction; and limiting the positioning component to move to a second target position when the positioning component rotates according to a second preset direction.
Optionally, the system further comprises a digitizing means;
the digitalizing device is used for digitalizing the depolarization measuring result to obtain a digitalized measuring result; and filtering the digital measurement result to obtain a final measurement result.
Optionally, the system further comprises a display device;
and the display device is used for acquiring the final measurement result, displaying the final measurement result and storing the final measurement result.
In addition, in order to achieve the above object, the present invention further provides a zero-bias-temperature-drift-free direct-current magnetic field measurement method, which is used for a zero-bias-temperature-drift-free direct-current magnetic field measurement system, wherein the system comprises a magnetic field sensor and a controller which are connected; the method comprises the following steps:
when the magnetic field sensor is arranged in a magnetic field to be measured, generating a first measurement instruction based on received measurement operation through the controller, and controlling the magnetic field sensor to move to a target direction;
measuring the magnetic field to be measured by the magnetic field sensor based on the first measurement instruction to obtain a first measurement result;
controlling, by the controller, based on the first measurement result, the magnetic field sensor to move to a direction opposite to the target direction and generate a second measurement instruction;
measuring the magnetic field to be measured by the magnetic field sensor based on the second measurement instruction to obtain a second measurement result;
obtaining, by the controller, a depolarization measurement based on the first measurement and the second measurement.
The technical scheme of the invention provides a direct-current magnetic field measuring system without zero offset temperature drift, which comprises a magnetic field sensor and a controller which are connected; the magnetic field sensor is arranged in a magnetic field to be measured; the controller is used for generating a first measurement instruction based on the received measurement operation and controlling the magnetic field sensor to move to a target direction; the magnetic field sensor is used for measuring the magnetic field to be measured based on the first measurement instruction to obtain a first measurement result; the controller is used for controlling the magnetic field sensor to move to the direction opposite to the target direction based on the first measurement result and generating a second measurement instruction; the magnetic field sensor is further configured to measure the magnetic field to be measured based on the second measurement instruction, so as to obtain a second measurement result; the controller is further configured to obtain a depolarization measurement result based on the first measurement result and the second measurement result.
In the existing measuring method, temperature sensors are placed in the sensors, then different temperatures are respectively calibrated, finally, thermometer grid data are formed and stored in a CPU for data correction, but the method can only weaken zero offset temperature drift to a certain extent and cannot eliminate the zero offset temperature drift, so that the accuracy of the measuring result is low. By utilizing the system of the invention, the magnetic field sensor moves to two completely opposite directions and respectively obtains a first measurement result and a second measurement result which correspond to each other, the two measurement results comprise the same zero offset temperature drift of the magnetic field sensor, the two measurement results are processed to eliminate the zero offset temperature drift of the magnetic field sensor and obtain an offset-removing measurement result which does not contain the zero offset temperature drift of the magnetic field sensor, so that the zero offset temperature drift is eliminated in the measurement results, thereby improving the accuracy of the measurement results, meanwhile, the method of the invention can greatly reduce, even completely eliminate the influence of 1/f noise, and the measurement system avoids zero point adjustment in the full temperature range. The invention can carry out high-precision, high-stability and low-noise direct-current magnetic field measurement, and is a superior scheme for researching and producing high-precision direct-current magnetic field standard instruments, calibration instruments and standard test equipment used in laboratories and scientific research departments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of a controller according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a DC magnetic field measurement system without zero offset temperature drift according to a first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a DC magnetic field measurement system without zero bias temperature drift;
FIG. 4 is a schematic structural diagram of a second embodiment of the DC magnetic field measurement system without zero offset temperature drift of the present invention;
FIG. 5 is a schematic structural diagram of a DC magnetic field measurement system without zero offset temperature drift according to a third embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a DC magnetic field measurement system without zero offset temperature drift according to a fourth embodiment of the present invention;
FIG. 7 is a schematic partial structural diagram of a fifth embodiment of the zero-bias temperature drift-free DC magnetic field measurement system of the present invention;
FIG. 8 is a flowchart of a DC magnetic field measuring method without zero offset temperature drift according to a first embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that all the directional indications (such as up, down, left, right, front, and rear … …) in the embodiment of the present application are only used to explain the relative position relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indication is changed accordingly.
In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a controller according to an embodiment of the present invention.
In general, a terminal device includes: at least one processor 301, a memory 302, and a zero-bias-temperature-drift-free dc magnetic field measurement program stored on the memory and executable on the processor, the zero-bias-temperature-drift-free dc magnetic field measurement program being configured to implement the steps of the zero-bias-temperature-drift-free dc magnetic field measurement method as described above.
The processor 301 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and so on. The processor 301 may be implemented using a single chip Microcomputer (MCU) and/or a microprocessor CPU.
In some embodiments, the terminal may further include: a communication interface 303 and at least one peripheral device. The processor 301, the memory 302 and the communication interface 303 may be connected by a bus or signal lines. Various peripheral devices may be connected to communication interface 303 via a bus, signal line, or circuit board. Specifically, the peripheral device includes: at least one of a data acquisition circuit 304, a display screen 305, and a power source 306.
The communication interface 303 may be used to connect at least one peripheral device related to I/O (Input/Output) to the processor 301 and the memory 302. In some embodiments, processor 301, memory 302, and communication interface 303 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 301, the memory 302 and the communication interface 303 may be implemented on a single chip or circuit board, which is not limited in this embodiment.
The data acquisition circuit 304 is used for performing AD high-precision conversion on the acquired data. The data acquisition circuit may employ an AD converter.
The display screen 305 is used to display a UI (User Interface). The UI may include graphics, text, icons, video, and any combination thereof. When the display screen 305 is a touch display screen, the display screen 305 also has the ability to capture touch signals on or over the surface of the display screen 305. The touch signal may be input to the processor 301 as a control signal for processing.
The power supply 306 is used to power various components in the electronic device. The power source 306 may be alternating current, direct current, disposable or rechargeable.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the terminal device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
In addition, an embodiment of the present invention further provides a computer-readable storage medium, where a zero-bias-temperature-drift-free direct-current magnetic field measurement program is stored on the computer-readable storage medium, and when being executed by a processor, the computer-readable storage medium implements the steps of the zero-bias-temperature-drift-free direct-current magnetic field measurement method described above. Therefore, a detailed description thereof will be omitted.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The computer-readable storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a first embodiment of the zero-bias temperature drift-free direct-current magnetic field measurement system of the present invention, which includes a magnetic field sensor 1 and a controller 2 connected together; the magnetic field sensor 1 is used for being placed in a magnetic field to be measured;
the controller 2 is configured to generate a first measurement instruction based on the received measurement operation, and control the magnetic field sensor 1 to move to a target direction;
the magnetic field sensor 1 is configured to measure the magnetic field to be measured based on the first measurement instruction, so as to obtain a first measurement result;
the controller 2 is configured to control the magnetic field sensor 1 to move to a direction opposite to the target direction based on the first measurement result, and generate a second measurement instruction;
the magnetic field sensor 1 is further configured to measure the magnetic field to be measured based on the second measurement instruction, so as to obtain a second measurement result;
the controller 2 is further configured to obtain a depolarization measurement result based on the first measurement result and the second measurement result.
It should be noted that, in the present invention, the structure of the controller refers to the above description, and is not described herein again, and in some embodiments, the controller may further include a measurement circuit and a direction control circuit, which are used for respectively implementing processing of the measurement result (including the first measurement result and the second measurement result) and controlling the direction of the magnetic field sensor. The direction of the existing magnetic field sensor is usually fixed, i.e. the magnetic field sensor is only arranged in the magnetic field to be measured and is in the target direction. The magnetic field measured by the magnetic field sensor in the target direction is the first measurement result, and the magnetic field measured by the magnetic field sensor in the direction opposite to the target direction is the second measurement result.
In general, the measurement method of the present invention is used to measure a steady dc magnetic field, the direction of which is fixed. The measurement operation can be directly sent to the controller, or the user can send the measurement operation to the controller through other sending equipment. When receiving the measurement operation, generating a first measurement instruction and controlling the direction of the magnetic field sensor at the same time; meanwhile, when the first measurement result is received, the generation of the second measurement instruction and the direction reversal of the control magnetic field sensor are carried out simultaneously.
In some embodiments, the direction of the magnetic field sensor may be controlled to be reversed when a first fixed time period arrives after the first measurement result is obtained, and then a second measurement instruction may be generated when a second fixed time period arrives after the direction of the magnetic field sensor is reversed, so as to ensure that the control of the measurement system is stable and prevent the magnetic field sensor from moving. The resulting inertia makes the magnetic field sensor unstable, resulting in inaccurate measurement results.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a dc magnetic field measurement system without zero offset temperature drift. In fig. 3, the different devices each have a zero-bias temperature drift, i.e. the total zero-bias temperature drift (a) comprises: the zero-bias temperature drift of the magnetic field sensor (the zero-bias Δ s of the sensor in fig. 3), the zero-bias temperature drift of the measuring circuit (the measuring circuit can be a part of the structure of the controller in the invention, and the measuring circuit can be a part of the structure of the controller in the invention) and the zero-bias temperature drift of the digitizing device (the digitized corresponding Δ d in fig. 3) and the zero-bias temperature drift of the output display device (the output display in fig. 3 corresponds to the Δ o). The measured magnetic field in fig. 3 is the magnetic field to be measured in the present application.
At present, the zero offset temperature drift of a measuring circuit (delta c in fig. 3), the zero offset temperature drift of a digital device (delta d in fig. 3) and the zero offset temperature drift of an output display device (delta o in fig. 3) can reduce the corresponding zero offset temperature drift as much as possible by improving the algorithm of each structure, so the zero offset temperature drift of the magnetic field sensor is mainly aimed at, namely the zero offset temperature drift of the magnetic field sensor is eliminated, namely the elimination of the total zero offset temperature drift (A) is realized to the greatest extent.
The zero bias temperature drift a has the greatest characteristic that its sign is one of positive or negative determined at any particular time. That is, for a given magnetic field measurement system and magnetic field to be measured, its a is a determined value during the equilibrium period of a certain temperature value. At the moment, the measured value of the magnetic field B to be measured is [ B + A ], if the direction of the magnetic field to be measured is reversed, the measured value is [ -B + A ], the two measured values are subtracted to obtain B + A- [ -B + A ] = 2B, and therefore, the obtained result has no relation with A, and the elimination of zero offset temperature drift is realized. If the results of the two measurements are added, 2A is obtained, which is the zero-bias temperature drift of the entire magnetic field measurement system at this temperature.
However, in practical application, because it is impractical to reverse the magnetic field to be measured, the invention reverses the direction of the magnetic field sensor, realizes 180-degree adjustment of the probe of the magnetic field sensor, and realizes the direction reversal of the magnetic field to be measured by phase change.
With reference to the above description, in particular, the controller is further configured to calculate a measurement difference between the first measurement result and the second measurement result; and obtaining the depolarization measurement result based on the measurement difference. Namely, dividing the measurement difference by 2 is the measurement value of the magnetic field to be measured, namely the depolarization measurement result, and the measurement result eliminates the zero-depolarization temperature drift of the magnetic field sensor.
In addition, because the 1/f noise is noise which changes slowly from 0.1Hz to 10Hz, the noise is difficult to filter in a direct current circuit (extremely large capacitance and inductance are needed), which is equivalent to the slowly changing direct current offset in a system, and similar to zero offset temperature drift A, a certain value and direction exist in a certain time period, so the noise can be filtered to a great extent. The better the low-frequency noise filtering effect. Of course, the faster the direction reversal speed of the magnetic field sensor, the higher the upper frequency limit to be filtered out.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a second embodiment of the dc magnetic field measurement system without zero offset temperature drift of the present invention, and the system further includes a direction control device 3; the direction control device 3 is connected with the controller 2, and the direction control device 3 is fixedly connected with the magnetic field sensor 1;
the controller 2 is further configured to obtain a first control instruction based on the measurement operation.
And the direction control device 3 is configured to control the magnetic field sensor to move to a target direction based on the first control instruction.
The controller is further configured to obtain a second control instruction based on the first measurement result.
The direction control device is further configured to control the magnetic field sensor to move to a direction opposite to the target direction based on the second control instruction.
In this embodiment, the direction control device is fixedly connected to the magnetic field sensor, and the controller controls the direction control device to reverse the direction of the magnetic field sensor.
Referring to fig. 5 to 6, fig. 5 is a schematic structural diagram of a dc magnetic field measurement system without zero bias temperature drift according to a third embodiment of the present invention, and fig. 6 is a schematic structural diagram of a dc magnetic field measurement system without zero bias temperature drift according to a fourth embodiment of the present invention. In fig. 5, the system further comprises a digitizing means 4; the digitalizer 4 is used for digitalizing the depolarization measuring result to obtain a digitalized measuring result; and filtering the digital measurement result to obtain a final measurement result.
In fig. 6, the system further comprises a display device 5; and the display device 5 is used for acquiring the final measurement result, displaying the final measurement result and storing the final measurement result.
In the embodiment, the depolarization measuring result can be digitized and filtered, so that the accuracy of the measuring result is improved to the maximum extent; meanwhile, the final measurement result can be stored and output, so that a user can quickly determine the measurement value of the magnetic field to be measured, and the final measurement result can be repeatedly checked in the stored data in the subsequent data processing process.
Referring to fig. 7, fig. 7 is a schematic partial structure diagram of a fifth embodiment of the zero-bias temperature drift-free dc magnetic field measurement system of the present invention.
The direction control device 3 comprises a motor 31 and a connecting rod 32; an output shaft 311 of the motor 31 is connected with the connecting rod 32, and the connecting rod 32 is fixedly connected with the magnetic field sensor 1;
the motor 31 is configured to rotate in a first preset direction based on the first control instruction, so that the connecting rod 32 drives the magnetic field sensor 1 to move to a target direction.
The motor 31 is further configured to rotate in a second preset direction based on the second control instruction, so that the connecting rod 32 drives the magnetic field sensor 1 to move to a direction opposite to the target direction.
It should be noted that, in the present invention, the motor may be an ultra-miniature servo motor, and when the first preset direction is a clockwise direction, the second preset direction is an anticlockwise direction, and similarly, when the first preset direction is an anticlockwise direction, the second preset direction is a clockwise direction. In fig. 7, the target direction is the direction directly above fig. 7, that is, the magnetic field sensor probe points to the direction directly above the paper surface; the target direction may also be directly down in fig. 7, i.e. when the magnetic field sensor probe is pointing directly down the paper.
And when the magnetic field sensor moves to the target direction and the direction opposite to the target direction, controlling the motor to stop rotating so as to ensure that the magnetic field sensor is respectively matched with the target direction and the direction opposite to the target direction.
Referring to fig. 7, the direction control apparatus further includes a stopper member 33, the connecting rod having a positioning member 321;
the limiting component 33 is configured to limit the positioning component 321 to move to a first target position when the positioning component 321 rotates according to a first preset direction; and restricts the positioning member 321 from moving to a second target position when the positioning member 321 rotates in a second predetermined direction.
It should be noted that, when the motor rotates, the connecting rod drives the positioning component to rotate simultaneously; when the magnetic field sensor moves to the target direction, the positioning component can be clamped by the limiting component and does not rotate any more, so that the motor and the connecting rod are driven to rotate no more, the magnetic field sensor does not rotate any more, the magnetic field sensor is positioned in the target direction at the moment, and the position corresponding to the positioning component at the moment is the first target position.
Similarly, when the magnetic field sensor moves to the direction opposite to the target direction, the positioning component can be clamped by the limiting component and does not rotate any more, so that the motor and the connecting rod are driven to rotate, the magnetic field sensor does not rotate any more, the magnetic field sensor is positioned in the direction opposite to the target direction at the moment, and the position corresponding to the positioning component at the moment is the second target position.
Referring to fig. 7, the direction control device has a housing enclosing the motor, the housing being provided with the position limiting member, wherein the housing may be cylindrical or square barrel-shaped.
The technical scheme of the invention provides a direct-current magnetic field measuring system without zero offset temperature drift, which comprises a magnetic field sensor and a controller which are connected; the magnetic field sensor is arranged in a magnetic field to be measured; the controller is used for generating a first measurement instruction based on the received measurement operation and controlling the magnetic field sensor to move to a target direction; the magnetic field sensor is used for measuring the magnetic field to be measured based on the first measurement instruction to obtain a first measurement result; the controller is used for controlling the magnetic field sensor to move to the direction opposite to the target direction based on the first measurement result and generating a second measurement instruction; the magnetic field sensor is further configured to measure the magnetic field to be measured based on the second measurement instruction, so as to obtain a second measurement result; the controller is further configured to obtain a depolarization measurement result based on the first measurement result and the second measurement result.
In the existing measuring method, temperature sensors are placed in the sensors, then different temperatures are respectively calibrated, finally, thermometer grid data are formed and stored in a CPU for data correction, but the method can only weaken zero offset temperature drift to a certain extent and cannot eliminate the zero offset temperature drift, so that the accuracy of the measuring result is low. By utilizing the system, the magnetic field sensor moves to two completely opposite directions and respectively obtains a first measurement result and a second measurement result which correspond to each other, the two measurement results comprise the same zero offset temperature drift of the magnetic field sensor, the two measurement results are processed to eliminate the zero offset temperature drift of the magnetic field sensor and obtain an offset removal measurement result which does not contain the zero offset temperature drift of the magnetic field sensor, so that the zero offset temperature drift is eliminated in the measurement results, and the accuracy of the measurement results is improved. Meanwhile, the method of the invention can greatly reduce and even completely eliminate the influence of 1/f noise, so that the measurement system is free from zero point adjustment in the full temperature range. The invention can carry out high-precision, high-stability and low-noise direct-current magnetic field measurement, and is a superior scheme for researching and producing high-precision direct-current magnetic field standard instruments, calibration instruments and standard test equipment used in laboratories and scientific research departments.
In addition, conventionally, a temperature sensor is placed in the sensor, then different temperatures are respectively calibrated, finally, temperature table data is formed and stored in the CPU for data correction. However, the biggest disadvantages of this approach are three: firstly, the calibration workload is very large, the time spent is very long, the temperature rise and the temperature reduction are very long, meanwhile, after the temperature calibration is carried out again after a period of use, the heavy and long process is carried out again; secondly, the investment for establishing high and low temperature equipment and environment is large; thirdly, the calibration cannot be carried out on the site, and the temperature calibration is inconvenient because the temperature calibration must be carried out by returning to a manufacturer. The method of the invention does not need calibration, does not need to carry out recalibration due to temperature change, saves a large amount of calibration time, simultaneously does not need to set high-low temperature equipment and environment for calibration, saves a large amount of investment, and does not need to carry out factory return calibration, thereby avoiding the generation of inconvenient conditions caused by the calibration process.
Therefore, on the basis of eliminating zero offset temperature drift, a large amount of investment is saved, and the practicability is improved.
Referring to fig. 8, fig. 8 is a flowchart of a first embodiment of the zero-bias-temperature-drift-free direct-current magnetic field measurement method of the present invention, the method is used for a zero-bias-temperature-drift-free direct-current magnetic field measurement system, and the system includes a magnetic field sensor and a controller connected; the method comprises the following steps:
step S61: when the magnetic field sensor is arranged in a magnetic field to be measured, a first measurement instruction is generated through the controller based on received measurement operation, and the magnetic field sensor is controlled to move to a target direction.
Step S62: and measuring the magnetic field to be measured by the magnetic field sensor based on the first measurement instruction to obtain a first measurement result.
Step S63: controlling, by the controller, the magnetic field sensor to move to a direction opposite to the target direction based on the first measurement result, and generating a second measurement instruction.
Step S64: and measuring the magnetic field to be measured through the magnetic field sensor based on the second measurement instruction to obtain a second measurement result.
Step S65: obtaining, by the controller, a depolarization measurement based on the first measurement and the second measurement.
It should be noted that, since the steps executed by the method of the present embodiment are the same as the steps of the system embodiment, the specific implementation and the achievable technical effects of the method of the present embodiment can refer to the foregoing embodiment, and are not described herein again.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A direct current magnetic field measurement system without zero offset temperature drift is characterized by comprising a magnetic field sensor and a controller which are connected; the magnetic field sensor is arranged in a magnetic field to be measured;
the controller is used for generating a first measurement instruction based on the received measurement operation and controlling the magnetic field sensor to move to a target direction;
the magnetic field sensor is used for measuring the magnetic field to be measured based on the first measurement instruction to obtain a first measurement result;
the controller is used for controlling the magnetic field sensor to move to the direction opposite to the target direction based on the first measurement result and generating a second measurement instruction;
the magnetic field sensor is further configured to measure the magnetic field to be measured based on the second measurement instruction, so as to obtain a second measurement result;
the controller is further configured to obtain a depolarization measurement result based on the first measurement result and the second measurement result.
2. The system of claim 1,
the controller is further configured to calculate a measurement difference between the first measurement and the second measurement; and obtaining the depolarization measurement result based on the measurement difference.
3. The system of claim 1, further comprising a directional control device; the direction control device is connected with the controller and fixedly connected with the magnetic field sensor;
the controller is further used for obtaining a first control instruction based on the measurement operation;
and the direction control device is used for controlling the magnetic field sensor to move to a target direction based on the first control instruction.
4. The system of claim 3,
the controller is further used for obtaining a second control instruction based on the first measurement result;
the direction control device is further configured to control the magnetic field sensor to move to a direction opposite to the target direction based on the second control instruction.
5. The system of claim 4, wherein the directional control device comprises a motor and a connecting rod;
an output shaft of the motor is connected with the connecting rod, and the connecting rod is fixedly connected with the magnetic field sensor;
the motor is used for rotating according to a first preset direction based on the first control instruction, so that the connecting rod drives the magnetic field sensor to move to a target direction.
6. The system of claim 5,
the motor is further configured to rotate in a second preset direction based on the second control instruction, so that the connecting rod drives the magnetic field sensor to move to a direction opposite to the target direction.
7. The system of claim 6, wherein the direction control device further comprises a position limiting member, the connecting rod having a positioning member;
the limiting component is used for limiting the positioning component to move to a first target position when the positioning component rotates in a first preset direction; and limiting the positioning component to move to a second target position when the positioning component rotates according to a second preset direction.
8. The system of claim 1, wherein the system further comprises a digitizing means;
the digitalizing device is used for digitalizing the depolarization measuring result to obtain a digitalized measuring result; and filtering the digital measurement result to obtain a final measurement result.
9. The system of claim 8, further comprising a display device;
and the display device is used for acquiring the final measurement result, displaying the final measurement result and storing the final measurement result.
10. A direct current magnetic field measuring method without zero bias temperature drift is characterized in that the method is used for a direct current magnetic field measuring system without zero bias temperature drift, and the system comprises a magnetic field sensor and a controller which are connected; the method comprises the following steps:
when the magnetic field sensor is arranged in a magnetic field to be measured, generating a first measurement instruction based on received measurement operation through the controller, and controlling the magnetic field sensor to move to a target direction;
measuring the magnetic field to be measured by the magnetic field sensor based on the first measurement instruction to obtain a first measurement result;
controlling, by the controller, based on the first measurement result, the magnetic field sensor to move to a direction opposite to the target direction and generate a second measurement instruction;
measuring the magnetic field to be measured by the magnetic field sensor based on the second measurement instruction to obtain a second measurement result;
obtaining, by the controller, a depolarization measurement based on the first measurement and the second measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111059061.1A CN113495231A (en) | 2021-09-10 | 2021-09-10 | Zero-bias-temperature-drift-free direct-current magnetic field measurement system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111059061.1A CN113495231A (en) | 2021-09-10 | 2021-09-10 | Zero-bias-temperature-drift-free direct-current magnetic field measurement system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113495231A true CN113495231A (en) | 2021-10-12 |
Family
ID=77996939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111059061.1A Pending CN113495231A (en) | 2021-09-10 | 2021-09-10 | Zero-bias-temperature-drift-free direct-current magnetic field measurement system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113495231A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114487944A (en) * | 2022-04-15 | 2022-05-13 | 深圳市柯雷科技开发有限公司 | Zero-gain temperature drift direct-current magnetic field measuring method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004069655A (en) * | 2002-08-09 | 2004-03-04 | Denso Corp | Adjustment method for offset of magnetic sensor |
| CN101685026A (en) * | 2008-09-24 | 2010-03-31 | 三一重工股份有限公司 | Method and device for calibrating zero position output value of sensitive shaft of tilt angle sensor |
| CN101922942A (en) * | 2010-07-16 | 2010-12-22 | 浙江大学 | Compensation method for axial magnetic field sensitivity of fiber optic gyro |
| CN102798832A (en) * | 2011-05-27 | 2012-11-28 | 美新半导体（无锡）有限公司 | Magnetic sensor test method and system |
| JP2013064643A (en) * | 2011-09-16 | 2013-04-11 | Toyo Gas Meter Kk | Method and apparatus for correcting zero point of ultrasonic flowmeter |
| CN103698556A (en) * | 2012-09-27 | 2014-04-02 | 北京同步科技有限公司 | Device and method for improving accuracy of acceleration sensors |
| CN103969615A (en) * | 2014-05-07 | 2014-08-06 | 上海海事大学 | Method for calibration of parameters of single-axis fluxgate sensor |
| CN107861083A (en) * | 2017-11-08 | 2018-03-30 | 歌尔科技有限公司 | A kind of magnetometer calibration method and apparatus |
| CN110542870A (en) * | 2019-08-08 | 2019-12-06 | 宁波中车时代传感技术有限公司 | Compensation circuit for sensitivity and zero temperature drift in Hall sensor integrated chip and compensation method thereof |
-
2021
- 2021-09-10 CN CN202111059061.1A patent/CN113495231A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004069655A (en) * | 2002-08-09 | 2004-03-04 | Denso Corp | Adjustment method for offset of magnetic sensor |
| CN101685026A (en) * | 2008-09-24 | 2010-03-31 | 三一重工股份有限公司 | Method and device for calibrating zero position output value of sensitive shaft of tilt angle sensor |
| CN101922942A (en) * | 2010-07-16 | 2010-12-22 | 浙江大学 | Compensation method for axial magnetic field sensitivity of fiber optic gyro |
| CN102798832A (en) * | 2011-05-27 | 2012-11-28 | 美新半导体（无锡）有限公司 | Magnetic sensor test method and system |
| JP2013064643A (en) * | 2011-09-16 | 2013-04-11 | Toyo Gas Meter Kk | Method and apparatus for correcting zero point of ultrasonic flowmeter |
| CN103698556A (en) * | 2012-09-27 | 2014-04-02 | 北京同步科技有限公司 | Device and method for improving accuracy of acceleration sensors |
| CN103969615A (en) * | 2014-05-07 | 2014-08-06 | 上海海事大学 | Method for calibration of parameters of single-axis fluxgate sensor |
| CN107861083A (en) * | 2017-11-08 | 2018-03-30 | 歌尔科技有限公司 | A kind of magnetometer calibration method and apparatus |
| CN110542870A (en) * | 2019-08-08 | 2019-12-06 | 宁波中车时代传感技术有限公司 | Compensation circuit for sensitivity and zero temperature drift in Hall sensor integrated chip and compensation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 张英堂 等: "非匀强磁场环境下三轴磁场传感器校正方法研究", 《传感技术学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114487944A (en) * | 2022-04-15 | 2022-05-13 | 深圳市柯雷科技开发有限公司 | Zero-gain temperature drift direct-current magnetic field measuring method |
| CN114487944B (en) * | 2022-04-15 | 2022-06-28 | 深圳市柯雷科技开发有限公司 | Zero-gain temperature drift direct-current magnetic field measuring method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1763676B1 (en) | Compensation circuit for integrated sensor modules and the like | |
| CN206057424U (en) | A kind of current measuring device | |
| KR102064630B1 (en) | Transducer acceleration compensation using a delay to match phase characteristics | |
| CN108344522A (en) | A kind of high-precision measurement circuit that band is calibrated automatically and method | |
| CN113495231A (en) | Zero-bias-temperature-drift-free direct-current magnetic field measurement system and method | |
| CN104970776A (en) | Body temperature detection method and high-precision dynamic calibration electronic thermometer device | |
| CN106094963A (en) | APD array chip bias voltage Full-automatic temperature compensation system | |
| CN116593060A (en) | Temperature compensation method, circuit and device for pressure sensor | |
| CN111089610B (en) | Signal processing method and device of encoder and related components | |
| CN109060101B (en) | Electronic scale environment self-adaptive adjusting method and system | |
| CN109781140B (en) | Cooperative measurement device and method of low-frequency inertial sensor calibration system | |
| EP2579052A1 (en) | Method for measuring resistance value of conversion resistance of current mode analog /digital converter | |
| CN107607144B (en) | Sensor baseline drift correction method and detection equipment | |
| US4534004A (en) | Apparatus and method for determining signal parameters of periodic square wave signals | |
| CN109358096B (en) | Method and system for measuring hydration degree of ionic polymer metal composite material | |
| CN109990804B (en) | Self-correcting circuit of sensor circuit temperature drift based on analog multiplier | |
| CN112666400A (en) | Capacitance measuring circuit capable of automatically compensating parasitic capacitance and use method and application thereof | |
| JP3929256B2 (en) | Differential transformer signal processing device | |
| CN111856617A (en) | Self-calibration method, device, medium and electronic equipment of geophone | |
| CN115014628B (en) | High-precision ocean pressure measurement system and measurement method | |
| CN111521863A (en) | Signal output and detection precision optimizing system | |
| CN219349111U (en) | Ultra-low error high-precision measurement system for dual-channel voltage signal source | |
| JP2564798B2 (en) | Digital display scales | |
| JP3623592B2 (en) | Temperature compensation method for force sensor | |
| RU2596073C2 (en) | Method of digital signal processing of pressure sensors |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211012 |
|
| RJ01 | Rejection of invention patent application after publication |