CN113030828A - Alternating magnetometer verification system and method - Google Patents
Alternating magnetometer verification system and method Download PDFInfo
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- CN113030828A CN113030828A CN202110320492.2A CN202110320492A CN113030828A CN 113030828 A CN113030828 A CN 113030828A CN 202110320492 A CN202110320492 A CN 202110320492A CN 113030828 A CN113030828 A CN 113030828A
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Abstract
The invention discloses an alternating magnetometer verification system and a verification method thereof, wherein the verification system comprises an alternating current standard source and a Helmholtz coil; the alternating current standard source is electrically connected with the Helmholtz coil; the verification method comprises the following steps: s1, generating alternating voltage by the computer control microprocessor and the FPGA chip; s2, the alternating voltage outputs exciting current through the isolation transformer and flows into the Helmholtz coil; s3, generating a standard magnetic field by the Helmholtz coil; the alternating magnetometer to be detected transmits the reading data to the computer; s4, converting the exciting current flowing out of the Helmholtz coil into a voltage of 1V; the voltage of S5 and 1V is converted and fed back to the computer; s6, calculating by a computer to obtain a magnetic induction intensity value of the standard magnetic field; and S7, comparing the calculated magnetic induction intensity value with the reading data of the alternating magnetometer to be detected by the computer, and judging and calibrating through the error value.
Description
Technical Field
The invention relates to the field of alternating magnetometers, in particular to a system and a method for calibrating an alternating magnetometer.
Background
With the development of science and technology, the application of magnetic fields is more and more extensive, and the magnetic fields are from the fields of high-speed rail detection, GPS navigation system, metal material flaw detection, safety detection, electromagnetic compatibility test, position measurement and the like. The magnetic field measurement can be divided into a constant magnetic field and an alternating magnetic field, and the measuring instrument for the magnetic field is a direct current magnetometer or an alternating current magnetometer.
In the field of electric energy metering, the alternating magnetometer is widely applied. When the electric energy meter calibrating device is checked, an alternating magnetometer is required to be used for measuring the magnetic field at the position of the checked meter of the calibrating device, and when I is less than or equal to 200A as specified in JJG 597 and 2005, the magnetic induction intensity B at the position of the checked meter of the electric energy meter calibrating device is less than or equal to 0.05 mT. With the international proposal of the IR46 electric energy meter to land on the ground in China, the new international national standard GB 17215.211 of the alternating current electric energy meter also uses an external power frequency magnetic field test as one of the electromagnetic compatibility test items, which requires that a magnetic field with a magnetic induction intensity of 0.5 mT (400A/m) is continuously applied to three perpendicular planes of the electric energy meter to be tested, and the magnetic field also needs to be calibrated using an alternating magnetometer.
The traditional alternating magnetometer accuracy verification method uses the following devices: alternating current source, frequency meter, standard resistance, alternating current voltmeter and magnetic field coil.
The principle of the conventional verification method is shown in fig. 1, an alternating current source generates exciting current to excite a magnetic field coil, a standard resistor is connected in a current loop in series, a high-precision alternating current voltmeter is used for measuring voltage drop on the resistor, so that alternating current is calibrated, the constant K of the magnetic field coil can be obtained through calibration, and the value of the magnetic field is obtained according to B = K × I. According to the requirements of JJG 1049-2009, a frequency point and a measuring range point are selected to test the indication error and the stability of the alternating magnetometer. The traditional alternating magnetometer accuracy calibration method has the advantages of multiple devices, complex installation and connection and operation, more calculation work due to the adoption of manual reading, easy occurrence of conditions such as calculation errors and the like, serious reduction of calibration efficiency and calibration accuracy of the alternating magnetometer, and certain inconvenience for the calibration work of the alternating magnetometer.
Disclosure of Invention
The invention aims to provide an alternating magnetometer calibration system and a calibration method thereof, which are simple to operate and improve calibration efficiency.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an alternating magnetometer verification system comprises an alternating current standard source and a Helmholtz coil; the Helmholtz coil is formed by coaxially arranging two identical circular coils in parallel, and an alternating current standard source is electrically connected with the Helmholtz coil; the alternating current standard source comprises a microprocessor, an FPGA chip, a waveform generator, a power amplifier, an isolation transformer, an I/V converter, a power regulator and an A/D converter; the signal end of the microprocessor is bidirectionally connected with the signal end of the FPGA chip, the output end of the FPGA chip is connected with the input end of the waveform generator, the output end of the waveform generator is connected with the input end of the power amplifier, and the output end of the power amplifier is connected with the input end of the isolation transformer; the first output end of the isolation transformer is connected with the input end of the Helmholtz coil, the output end of the Helmholtz coil is connected with the first input end of the I/V converter, the second output end of the isolation transformer is connected with the second input end of the I/V converter, the output end of the I/V converter is connected with the input end of the power regulator, the output end of the power regulator is connected with the input end of the A/D converter, and the output end of the A/D converter is connected with the input end of the FPGA chip.
Further, the distance between two identical circular coils of the Helmholtz coil is consistent with the radius value of the circular coil.
Furthermore, alternating magnetometer verification system still includes the fixed adjusting device who fixes the inductive probe of alternating magnetometer examined, and fixed adjusting device sets up in helmholtz coil one side.
Furthermore, the alternating current standard source further comprises a liquid crystal screen, a digital key and a power supply module, wherein the signal ends of the liquid crystal screen and the digital key are both connected with the signal end of the microprocessor in a bidirectional mode, and the output end of the power supply module is connected with the input end of the microprocessor.
Furthermore, alternating magnetometer verification system still includes the computer, alternating current standard source still includes communication interface, and communication interface's signal end is connected with microprocessor, computer's signal end both way respectively, and the signal end of computer and the signal end both way junction of the alternating magnetometer of examining.
A calibration method of an alternating magnetometer calibration system comprises the following steps:
s1, setting waveform change parameters by the computer, and controlling the waveform generator to generate alternating voltage according to the set waveform amplitude and waveform frequency through the microprocessor and the FPGA chip;
s2, amplifying the alternating voltage through a power amplifier, and outputting an exciting current through an isolation transformer, wherein the exciting current flows into a Helmholtz coil;
s3, generating a stable standard magnetic field by the Helmholtz coil; detecting the magnetic induction intensity in the magnetic field by an induction probe of the alternating magnetometer to be detected, and transmitting data to a computer;
s4, converting the exciting current flowing out of the Helmholtz coil into a voltage of 1V after the conversion operation of the I/V converter and the power regulator;
s5, after the voltage of 1V is converted by the A/D converter, the data information of the exciting current is fed back to the FPGA chip and the microprocessor, and the microprocessor transmits the data information of the exciting current to the computer;
s6, obtaining the magnetic induction intensity value of the standard magnetic field by the computer through a formula B = K I; wherein, B is the magnetic induction intensity value, K is the coil constant, and I is the exciting current value;
and S7, comparing the calculated standard magnetic field magnetic induction intensity value with the magnetic induction intensity data detected by the alternating magnetometer to be detected by the computer, and judging the detection accuracy of the alternating magnetometer to be detected according to the error value of the standard magnetic field magnetic induction intensity value and the magnetic induction intensity data.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the alternating current magnetometer, the high-precision alternating current standard source is adopted to replace traditional alternating current sources, standard resistors, alternating voltage meters, frequency meters and other equipment, so that when the alternating magnetometer is verified, the amplitude and frequency-adjustable high-precision alternating current can be output by using one alternating current standard source, complex installation and wiring operations are not needed, complex operation steps are avoided, and the detection convenience of the alternating magnetometer is improved; the invention is combined with the computer, the alternating current standard source is controlled by the computer to output exciting current, meanwhile, the standard magnetic field value is automatically calculated according to the exciting current feedback result, the error value and the stability of the alternating magnetometer to be detected are directly obtained according to the comparison between the standard magnetic field value and the magnetic field value detected by the alternating magnetometer to be detected, the calculation deviation caused by manual operation is greatly reduced, the verification efficiency and the verification accuracy of the alternating magnetometer are improved, and the convenience is brought to the verification work of the alternating magnetometer.
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, and 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 these drawings without creative efforts.
FIG. 1 is a block diagram of a prior art detection apparatus for an alternating magnetometer;
FIG. 2 is a schematic structural diagram of an alternating magnetometer verification system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art without any creative effort, should be included in the protection scope of the present invention.
As shown in fig. 2, the present embodiment discloses an alternating magnetometer verification system, which includes an alternating current standard source and a helmholtz coil; the Helmholtz coil is formed by coaxially arranging two identical circular coils in parallel, and the distance between the coils is consistent with the radius value of the coils; the alternating current standard source is electrically connected with the Helmholtz coil;
the alternating current standard source comprises a microprocessor, an FPGA chip, a waveform generator, a power amplifier, an isolation transformer, an I/V converter, a power regulator and an A/D converter; the signal end of the microprocessor is bidirectionally connected with the signal end of the FPGA chip, the output end of the FPGA chip is connected with the input end of the waveform generator, the output end of the waveform generator is connected with the input end of the power amplifier, and the output end of the power amplifier is connected with the input end of the isolation transformer; the first output end of the isolation transformer is connected with the input end of the Helmholtz coil, the output end of the Helmholtz coil is connected with the first input end of the I/V converter, the second output end of the isolation transformer is connected with the second input end of the I/V converter, the output end of the I/V converter is connected with the input end of the power regulator, the output end of the power regulator is connected with the input end of the A/D converter, and the output end of the A/D converter is connected with the input end of the FPGA chip.
Because the Helmholtz coil needs excitation current with very stable frequency and amplitude when generating a standard alternating magnetic field, and the waveform distortion degree is small; and the constant current source can bear the impact of back electromotive force induced by the magnetic field coil, which also puts high requirements on the reliability of the current source. Therefore, the invention adopts the constant temperature crystal with high stability as the frequency clock, and the RAM and the 16bit DAC stored by the FPGA chip are used for converting and outputting the current with high stability.
The alternating magnetometer calibration system further comprises fixed adjusting equipment for fixing an induction probe of the alternating magnetometer to be tested, and the fixed adjusting equipment is arranged on one side of the Helmholtz coil.
The alternating magnetometer usually adopts a coil induction probe, and the plane of the probe is ensured to be vertical to the direction of a magnetic field during testing, the fixed adjusting equipment can be connected with a computer, and the computer controls a stepping motor in the fixed adjusting equipment to realize the optimal test point of the induction probe; when the best test point is searched, the computer synchronously reads the detection data of the detected magnetometer, and when the magnetic field is the maximum value, the plane of the probe can be determined to be vertical to the direction of the magnetic field.
The alternating current standard source further comprises a communication interface, a liquid crystal display, a digital key and a power supply module, wherein the signal ends of the communication interface, the liquid crystal display and the digital key are connected with the signal end of the microprocessor in a bidirectional mode, and the output end of the power supply module is connected with the input end of the microprocessor. The alternating magnetometer calibration system further comprises a computer, and the signal end of the computer is respectively connected with the communication interface and the signal end of the alternating magnetometer to be tested in a bidirectional mode.
The invention discloses a calibrating method of an alternating magnetometer calibrating system, which comprises the following working steps:
(1) the alternating current standard source receives parameters set by a computer, the microprocessor controls the waveform generator to generate alternating voltage according to set amplitude and frequency, the alternating voltage is amplified by the power amplifier and then is output by the isolation transformer, the alternating current standard source is internally provided with a broadband precise I/V converter, the loop exciting current is converted into 1V voltage and is fed back to the FPGA chip after being converted by the A/D converter for feedback measurement of the exciting current, and therefore the output of the precise alternating current is realized;
(2) the Helmholtz coil is composed of two circular coils with the radius of R, the distance L = R between the two coils can generate a uniform linear magnetic field with a certain volume at the axial center of the coil, the stability and the precision of the magnetic field completely depend on the exciting current I, and the coil constant K can be determined by verification, so that the value of the magnetic field can be calculated according to a formula B = K I;
(3) the probe of the alternating magnetometer to be detected is placed on a fixed adjusting device, and the fixed adjusting device can drive an induction probe to move back and forth and rotate axially through a stepping motor so as to find an optimal magnetic field test point;
(4) the computer synchronously collects the reading data of the alternating magnetometer to be detected and calculates the error of the display value according to the formula calculation result; meanwhile, when the stability of the alternating magnetometer to be tested is tested, the display data of the alternating magnetometer to be tested can be automatically read at intervals of 3 minutes, and the stability of the alternating magnetometer to be tested is calculated; finally, after all the detections are verified, the computer can automatically generate a verification report, thereby improving the verification operation convenience of the alternating magnetometer.
According to the alternating current magnetometer, the high-precision alternating current standard source is adopted to replace traditional alternating current sources, standard resistors, alternating voltage meters, frequency meters and other equipment, so that when the alternating magnetometer is verified, the amplitude and frequency-adjustable high-precision alternating current can be output by using one alternating current standard source, complex installation and wiring operations are not needed, complex operation steps are avoided, and the detection convenience of the alternating magnetometer is improved; the invention is combined with the computer, the alternating current standard source is controlled by the computer to output exciting current, meanwhile, the standard magnetic field value is automatically calculated according to the exciting current feedback result, the error value and the stability of the alternating magnetometer to be detected are directly obtained according to the comparison between the standard magnetic field value and the magnetic field value detected by the alternating magnetometer to be detected, the calculation deviation caused by manual operation is greatly reduced, the verification efficiency and the verification accuracy of the alternating magnetometer are improved, and the convenience is brought to the verification work of the alternating magnetometer.
Claims (6)
1. An alternating magnetometer verification system is characterized in that: the alternating magnetometer verification system comprises an alternating current standard source and a Helmholtz coil; the Helmholtz coil is formed by coaxially arranging two identical circular coils in parallel, and an alternating current standard source is electrically connected with the Helmholtz coil; the alternating current standard source comprises a microprocessor, an FPGA chip, a waveform generator, a power amplifier, an isolation transformer, an I/V converter, a power regulator and an A/D converter; the signal end of the microprocessor is bidirectionally connected with the signal end of the FPGA chip, the output end of the FPGA chip is connected with the input end of the waveform generator, the output end of the waveform generator is connected with the input end of the power amplifier, and the output end of the power amplifier is connected with the input end of the isolation transformer; the first output end of the isolation transformer is connected with the input end of the Helmholtz coil, the output end of the Helmholtz coil is connected with the first input end of the I/V converter, the second output end of the isolation transformer is connected with the second input end of the I/V converter, the output end of the I/V converter is connected with the input end of the power regulator, the output end of the power regulator is connected with the input end of the A/D converter, and the output end of the A/D converter is connected with the input end of the FPGA chip.
2. The alternating magnetometer verification system of claim 1 wherein: the distance between two identical circular coils of the Helmholtz coil is consistent with the radius value of the circular coil.
3. The alternating magnetometer verification system of claim 2 wherein: the alternating magnetometer calibration system further comprises fixed adjusting equipment for fixing an induction probe of the alternating magnetometer to be tested, and the fixed adjusting equipment is arranged on one side of the Helmholtz coil.
4. An alternating magnetometer verification system according to claim 3 wherein: the alternating current standard source further comprises a liquid crystal screen, a digital key and a power supply module, wherein the signal ends of the liquid crystal screen and the digital key are both connected with the signal end of the microprocessor in a bidirectional mode, and the output end of the power supply module is connected with the input end of the microprocessor.
5. The alternating magnetometer verification system of claim 4 wherein: the alternating magnetometer verification system further comprises a computer, the alternating current standard source further comprises a communication interface, the signal end of the communication interface is respectively in bidirectional connection with the signal ends of the microprocessor and the computer, and the signal end of the computer is in bidirectional connection with the signal end of the alternating magnetometer to be detected.
6. An assay method for an alternating magnetometer assay system according to claim 5 wherein: the method comprises the following steps:
s1, setting waveform change parameters by the computer, and controlling the waveform generator to generate alternating voltage according to the set waveform amplitude and waveform frequency through the microprocessor and the FPGA chip;
s2, amplifying the alternating voltage through a power amplifier, and outputting an exciting current through an isolation transformer, wherein the exciting current flows into a Helmholtz coil;
s3, generating a stable standard magnetic field by the Helmholtz coil; detecting the magnetic induction intensity in the magnetic field by an induction probe of the alternating magnetometer to be detected, and transmitting data to a computer;
s4, converting the exciting current flowing out of the Helmholtz coil into a voltage of 1V after the conversion operation of the I/V converter and the power regulator;
s5, after the voltage of 1V is converted by the A/D converter, the data information of the exciting current is fed back to the FPGA chip and the microprocessor, and the microprocessor transmits the data information of the exciting current to the computer;
s6, obtaining the magnetic induction intensity value of the standard magnetic field by the computer through a formula B = K I; wherein, B is the magnetic induction intensity value, K is the coil constant, and I is the exciting current value;
and S7, comparing the calculated standard magnetic field magnetic induction intensity value with the magnetic induction intensity data detected by the alternating magnetometer to be detected by the computer, and judging the detection accuracy of the alternating magnetometer to be detected according to the error value of the standard magnetic field magnetic induction intensity value and the magnetic induction intensity data.
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| CN114184989A (en) * | 2021-12-01 | 2022-03-15 | 中国科学院合肥物质科学研究院 | Magnetic probe amplitude-frequency and phase-frequency calibration system and method based on Helmholtz coil |
| CN114397615A (en) * | 2021-12-09 | 2022-04-26 | 贵州电网有限责任公司 | Magnetic field sensor calibration system |
| CN115128532A (en) * | 2022-05-12 | 2022-09-30 | 中科飞特(山东)科技有限公司 | Magnetometer manufacturing and calibrating equipment and method thereof |
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