CN117724028A - Calibration system and calibration method for three-dimensional multi-point magnetic probe - Google Patents
Calibration system and calibration method for three-dimensional multi-point magnetic probe Download PDFInfo
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Abstract
A calibration system and a calibration method for a three-dimensional multi-point magnetic probe belong to the technical field of plasma magnetic field measurement. The method solves the problems of three-dimensional magnetic probe calibration for diagnosing a plasma magnetic field, complex and repeated multi-point calibration operation of the magnetic probe and direction limitation of three-dimensional magnetic probe calibration. According to the invention, the Helmholtz coil is controlled by the three-dimensional Helmholtz coil on-off device to respectively generate standard magnetic fields in the X, Y and Z directions, so that the three-dimensional magnetic probe can be simply and rapidly calibrated, and the calibration precision and speed are ensured. The invention uses the coil moving device, the Helmholtz coil fixing shell and the graduated scale ensure that the center of the coil can accurately move to the point position of the small magnetic probe, not only can accurately adjust the positions of the coil when calibrating different point positions and is simple and convenient to operate, but also can lead the coil to generate X, Y and Z to correspond to the X, Y and Z on the magnetic probe, thereby reducing errors and avoiding repeated operation.
Description
Technical Field
The invention belongs to the technical field of plasma magnetic field measurement, and particularly relates to a calibration system and a calibration method for a three-dimensional multi-point magnetic probe.
Background
A plasma is a complex system of multiple degrees of freedom, whose characteristics cannot be represented simply by some physical parameters. Therefore, in plasma research, the concept corresponding to measurement is diagnosis, and the method has wider meaning than measurement, and comprises analysis of data and detection and judgment of a collective motion mode. For measurements in which the magnetism is measured, a magnetic probe is generally used for the measurement. However, the common magnetic probe cannot meet the requirement of the magnetic field diagnosis of areas with more areas, and a large three-dimensional magnetic probe (which is composed of a plurality of small magnetic probes, three small magnetic probes are combined into a group to respectively measure the magnetic fields in the X, Y and Z directions) with good time resolution and space resolution is required to be used for measuring the three-dimensional magnetic field distribution and change condition in the plasma. However, if the magnetic field is measured with a three-dimensional magnetic probe, calibration, i.e. correction of sensitivity, is required. In the current market, a commonly used magnetic probe calibration system adopts a one-dimensional Helmholtz coil to generate a standard magnetic field. The system is simple and quick for calibrating the one-dimensional magnetic probe, but the operation for calibrating the three-dimensional magnetic probe is complicated.
Disclosure of Invention
The invention aims to solve the problems of three-dimensional magnetic probe calibration for diagnosing a plasma magnetic field, complex and repeated multi-point calibration operation of a magnetic probe and the problem of direction limitation of three-dimensional magnetic probe calibration, and further provides a calibration system and a calibration method for the three-dimensional magnetic probe.
The technical scheme adopted by the invention is as follows:
a calibration system for a three-dimensional multi-point magnetic probe comprises a current probe, a magnetic probe, a Helmholtz coil, a power amplifier, a signal generator, a three-dimensional Helmholtz coil on-off device, an oscilloscope and a coil moving device;
the signal generator is connected with the power amplifier and amplifies signals; the signal is transmitted to a three-dimensional Helmholtz coil on-off device, whether the current passes through the Helmholtz coils X, Y and Z direction coils is determined by the signal,
the acquisition port of the oscilloscope is connected with a magnetic probe positioned at the center of the Helmholtz coil and a current probe for measuring loop current to acquire the voltage and current parameters of the Helmholtz coil and the magnetic probe to be measured,
the Helmholtz coil and the magnetic probe are placed on a coil moving device, and the position of the coil is accurately adjusted.
The calibration method for the calibration system of the three-dimensional multi-point magnetic probe comprises the following steps:
s1, an enameled wire is wound into a Helmholtz coil, the Helmholtz coils in the X direction, the Y direction and the Z direction are obtained, and the Helmholtz coils are connected through coaxial wires;
s2, a magnetic probe penetrates through the center of a Helmholtz coil, the Helmholtz coil and the magnetic probe are placed on a coil moving device, and a coaxial line of the Helmholtz coil is connected with a three-dimensional Helmholtz coil on-off device;
s3, selecting the frequency, amplitude and multiple of a power amplifier of the signal generator according to requirements, and starting the signal generator and the power amplifier to supply power for the Helmholtz coil;
s4: obtaining voltage and current parameters of the Helmholtz coil and the magnetic probe to be detected through an oscilloscope, and calculating to obtain the effective area of one point position of the magnetic probe;
s5: the coils in the X, Y and Z directions are electrified by using a three-dimensional Helmholtz coil on-off device, the Helmholtz coils are moved to corresponding points, and S3 and S4 are repeated.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the power-on direction and the coil position of the Helmholtz coil are controlled through the three-dimensional Helmholtz coil on-off device and the coil moving device, so that the frequency response characteristic of the three-dimensional magnetic probe is accurately measured, the operation is simple, convenient and quick, and the method is suitable for calibrating the three-dimensional multi-point magnetic probe.
2. According to the invention, the Helmholtz coil is controlled by the three-dimensional Helmholtz coil on-off device to respectively generate standard magnetic fields in the X, Y and Z directions, so that the three-dimensional magnetic probe can be simply and rapidly calibrated, and the calibration precision and speed are ensured.
3. The invention uses the coil moving device, the Helmholtz coil fixing shell and the graduated scale ensure that the center of the coil can accurately move to the point position of the small magnetic probe, not only can accurately adjust the positions of the coil when calibrating different point positions and is simple and convenient to operate, but also can lead the coil to generate X, Y and Z to correspond to the X, Y and Z on the magnetic probe, thereby reducing errors and avoiding repeated operation.
4. The calibration system of the invention has smaller space and rapid calibration, and can meet the space and time limitation of the calibration of a plurality of magnetic probes.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a three-dimensional Helmholtz coil switch of the invention;
FIG. 3 is a schematic diagram of a coil moving apparatus according to the present invention;
FIG. 4 is a schematic view of a Helmholtz coil mounting case of the present invention;
FIG. 5 is a schematic diagram of a bobbin for winding a Helmholtz coil of the present invention;
wherein: 1. a current probe; 2. a magnetic probe; 3. a helmholtz coil; 4. a switch; 5. BNC connector; 6. a fixing rod; 7. a graduated scale; 8. a fixed base; 9. a helmholtz coil fixing case; 10. a fixing hole; 11. a magnetic probe passing hole; 12. a power amplifier; 13. a signal generator; 14. a three-dimensional helmholtz coil on-off device; 15. a protection resistor; 16. an oscilloscope.
Detailed Description
For a better understanding of the objects, structures and functions of the present invention, reference should be made to the following detailed description of the invention with reference to the accompanying drawings.
The calibration system for the three-dimensional magnetic probe comprises:
(1) Standard magnetic field generating circuit: the signal generated by the signal generator 13 is amplified by the power amplifier 12, and then passes through the three-dimensional Helmholtz coil on-off device 14 and the Helmholtz coil 3 to generate standard magnetic fields in X, Y and Z directions.
(2) The signal acquisition circuit: the current probe 1 and the magnetic probe 2 are connected with an oscilloscope 16, so that the current parameter of the Helmholtz coil 3 and the voltage parameter of the magnetic probe 2 to be measured are obtained.
(3) Coil moving device: the center of the Helmholtz coil 3 penetrates through the magnetic probe 2, and is placed on a coil moving device to accurately move and calibrate a plurality of points.
The method comprises the following steps: as shown in figures 1 to 5 of the drawings,
the invention relates to a calibration system for a three-dimensional multi-point magnetic probe, which comprises a current probe 1, a magnetic probe 2, a Helmholtz coil 3, a power amplifier 12, a signal generator 13, a three-dimensional Helmholtz coil on-off device 14, an oscilloscope 16 and a coil moving device, wherein the three-dimensional multi-point magnetic probe is arranged on the current probe;
the signal generator 13 is connected with the power amplifier 12 by a coaxial line and amplifies signals; the signal is transmitted to a three-dimensional helmholtz coil switch 14, from which it is determined whether the coils in the helmholtz coils 3x, y, z directions pass electric currents,
the acquisition port of the oscilloscope 16 is connected with the magnetic probe 2 positioned at the center of the Helmholtz coil 3 and the current probe 1 for measuring loop current to acquire the voltage and current parameters of the Helmholtz coil 3 and the magnetic probe 2 to be measured,
the helmholtz coil 3 and the magnetic probe 2 are placed on a coil moving device, and the coil position is precisely adjusted.
The Helmholtz coil 3 is formed by winding 0.3mm enameled wires on a Helmholtz coil frame in the X, Y and Z directions respectively. The Helmholtz coil frame is a cube with the size of 40mm, two circles of grooves are respectively formed in the X, Y and Z directions, the distance between the grooves is 14mm, and the shape of the grooves is a circle with the diameter of 35 mm.
The signal generator 13 is WF1968, the highest frequency of the sine wave is 200MHz (sine wave), the highest output voltage is 20 Vp-p/open, and the waveform amplitude resolution is about 6 bits.
The power amplifier 12 is HSA4101, the frequency bandwidth is DC-10 MHz, the output voltage is 142Vp-p, the output current is 2.8Ap-p, and the conversion rate is 5000V/. Mu.s.
The three-dimensional helmholtz coil switch 14 has a main switch, X, Y, Z switches 4, for a total of four switches 4. There are also four BNC connectors 5 in one-to-one correspondence with the switches 4.
The coaxial line on the Helmholtz coil 3 is connected with three BNC connectors 5 on a three-dimensional Helmholtz coil on-off device 14 according to three directions of X, Y and Z.
The helmholtz coil 3 is connected to a protection resistor 15. The protection resistor 15 is a 50 Ω resistor.
The coil moving device comprises a fixed rod 6, a graduated scale 7, a fixed base 8 and a Helmholtz coil fixed shell 9; be equipped with two vertical supports on unable adjustment base 8, helmholtz coil 3 is placed in helmholtz coil fixed shell 9, and helmholtz coil 3 and helmholtz coil fixed shell 9 are all placed between two vertical supports of unable adjustment base 8, fixed rod 6 passes fixed orifices 10 that are equipped with on the helmholtz coil fixed shell 9, and both ends are taken on vertical supports, and fixed rod 6 sets up in helmholtz coil 3 top, magnetic probe 2 passes the magnetic probe on the helmholtz coil fixed shell 9 and is connected with helmholtz coil 3 center through hole 11, sets up scale 7 on unable adjustment base 8 along the scope that helmholtz coil 3 removed. The helmholtz coil 3 is precisely moved to the point by the scale 7.
The calibration method for the calibration system of the three-dimensional multi-point magnetic probe comprises the following steps:
s1, an enameled wire is wound into a Helmholtz coil 3, the Helmholtz coil 3 in the X direction, the Y direction and the Z direction is obtained, and the Helmholtz coil 3 is connected through a coaxial line;
as shown in fig. 1, this is a skeleton of a helmholtz coil 3, on which an enameled wire is wound, and the number of turns is determined by the required magnetic field, for example, 30 turns are selected to wind the helmholtz coil 3 in the X, Y, and Z directions, and the wound enameled wire is welded to a coaxial line to obtain three coaxial lines.
S2, the magnetic probe 2 penetrates through the center of the Helmholtz coil 3, the Helmholtz coil 3 and the magnetic probe 2 are placed on a coil moving device, and the Helmholtz coil 3 can be moved to the point of the magnetic probe 2 according to requirements. The coaxial line on the helmholtz coil 3 is connected to a three-dimensional helmholtz coil on-off 14.
The Helmholtz coil 3 is arranged on a Helmholtz coil fixing shell 9, a magnetic probe 2 is connected with the center of the Helmholtz coil 3 through a hole by the magnetic probe 2 on the Helmholtz coil fixing shell 9, and then is arranged on a fixing base 8, a fixing rod 6 passes through a fixing hole 10 on the Helmholtz coil fixing shell 9 to be connected with the fixing base 8, a coaxial line on the Helmholtz coil 3 is connected with three BNC joints 5 on a three-dimensional Helmholtz coil on-off device 14 according to three directions of X, Y and Z, the Helmholtz coil 3 is precisely moved to a point position by a graduated scale 7, a small probe (Y-shaped probe) of No. 1 is firstly calibrated, the coil is moved to the point position of the probe No. 1 by referring to the graduated scale 7,
as shown in fig. 3, a three-dimensional helmholtz coil switch 14. The three-dimensional Helmholtz coil on-off 14 total switch is turned on, -the Y direction switch 4, and the X and Z direction switches 4 are turned off.
S3, selecting the frequency, amplitude and multiple of the power amplifier 12 of the signal generator 13 according to requirements, starting the signal generator 13 and the power amplifier 12, wherein the output frequency is 150kHz, the DC coupling is 2.5Vp-p, the amplification factor is 100 times, and the power is supplied to the Helmholtz coil 3;
s4: obtaining voltage and current parameters of the Helmholtz coil 3 and the magnetic probe 2 to be detected through an oscilloscope 16, and calculating to obtain the effective area of one point of the magnetic probe 2;
s5: the coils in the X, Y, Z directions are energized using a three-dimensional helmholtz coil on-off 14, respectively, and the helmholtz coil 3 is moved to the corresponding point, repeating S3 and S4.
S51, calibrating a second small probe (X-shaped probe), moving a coil to the point position of the second probe by referring to a graduated scale 7, opening a main switch of a three-dimensional Helmholtz coil on-off device 14, closing an X-direction switch 4, closing a Y-direction switch 4 and a Z-direction switch 4, and repeating S3 and S4;
s52, calibrating a third-size small probe (Z-type probe), moving the coil to the point position of the third-size probe by referring to the graduated scale 7, opening a main switch of the three-dimensional Helmholtz coil on-off device 14, closing the Z-direction switch 4, closing the Y-direction switch 4 and repeating the S3 and the S4; the calibration of a group of small magnetic probes 2 is completed,
s53, repeating the steps S2-S5, and completing the calibration of the whole large three-dimensional magnetic probe 2.
It will be understood that the invention has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (8)
1. The calibration system for the three-dimensional multi-point magnetic probe is characterized in that: the device comprises a current probe (1), a magnetic probe (2), a Helmholtz coil (3), a power amplifier (12), a signal generator (13), a three-dimensional Helmholtz coil on-off device (14), an oscilloscope (16) and a coil moving device;
the signal generator (13) is connected with the power amplifier (12) and amplifies signals; the signal is transmitted to a three-dimensional Helmholtz coil on-off device (14), and whether the current passes through the Helmholtz coils (3) in the X, Y and Z directions or not is determined by the signal,
the acquisition port of the oscilloscope (16) is connected with the magnetic probe (2) positioned at the center of the Helmholtz coil (3) and the current probe (1) for measuring loop current to acquire the voltage and current parameters of the Helmholtz coil (3) and the magnetic probe (2) to be measured,
the Helmholtz coil (3) and the magnetic probe (2) are placed on a coil moving device, and the position of the coil is accurately adjusted.
2. A calibration system for a three-dimensional, multi-point magnetic probe according to claim 1, wherein: the Helmholtz coil (3) is formed by winding an enameled wire on a Helmholtz coil framework in the X, Y and Z directions respectively.
3. A calibration system for a three-dimensional, multi-point magnetic probe according to claim 2, characterized in that: the coil moving device comprises a fixed rod (6), a graduated scale (7), a fixed base (8) and a Helmholtz coil fixed shell (9); be equipped with two vertical supports on unable adjustment base (8), helmholtz coil (3) are placed in helmholtz coil fixed shell (9), and helmholtz coil (3) and helmholtz coil fixed shell (9) are all placed between two vertical supports of unable adjustment base (8), fixed rod (6) pass fixed orifices (10) that are equipped with on helmholtz coil fixed shell (9), and both ends are taken on vertical supports, and fixed rod (6) set up in helmholtz coil (3) top, magnetic probe (2) pass on helmholtz coil fixed shell (9) and are connected through hole (11) and helmholtz coil (3) center, set up scale (7) on unable adjustment base (8) along the scope that helmholtz coil (3) removed.
4. A calibration system for a three-dimensional, multi-point magnetic probe according to claim 1, wherein: coaxial lines on the Helmholtz coil (3) are connected with three BNC connectors (5) on a three-dimensional Helmholtz coil on-off device (14) according to three directions of X, Y and Z.
5. A calibration system for a three-dimensional, multi-point magnetic probe according to claim 1, wherein: the Helmholtz coil (3) is connected to a protection resistor (15).
6. A calibration method using the calibration system for a three-dimensional multi-point magnetic probe according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
s1, an enameled wire is wound into a Helmholtz coil (3), the Helmholtz coil (3) in the X direction, the Y direction and the Z direction is obtained, and the Helmholtz coil (3) is connected through a coaxial line;
s2, a magnetic probe (2) penetrates through the center of a Helmholtz coil (3), the Helmholtz coil (3) and the magnetic probe (2) are placed on a coil moving device, and a coaxial line on the Helmholtz coil (3) is connected with a three-dimensional Helmholtz coil on-off device (14);
s3, selecting the frequency, amplitude and multiple of a power amplifier (12) of a signal generator (13) according to requirements, and starting the signal generator (13) and the power amplifier (12) to supply power for the Helmholtz coil (3);
s4: obtaining voltage and current parameters of the Helmholtz coil (3) and the magnetic probe (2) to be detected through an oscilloscope (16), and calculating to obtain the effective area of one point of the magnetic probe (2);
s5: the coils in the X, Y and Z directions are energized respectively by using a three-dimensional Helmholtz coil on-off device (14), and the Helmholtz coil (3) is moved to the corresponding point, and S3 and S4 are repeated.
7. The calibration method for the calibration system of the three-dimensional multi-point magnetic probe according to claim 6, wherein the calibration method comprises the following steps of: the step S2 is specifically as follows: the helmholtz coil (3) is placed in helmholtz coil fixed shell (9), magnetic probe (2) pass through magnetic probe (2) on helmholtz coil fixed shell (9) and are connected through hole and helmholtz coil (3) center, place behind and on unable adjustment base (8), fixed stick (6) pass fixed orifices (10) on helmholtz coil fixed shell (9) and are connected with unable adjustment base (8), coaxial line on helmholtz coil (3) is connected with three BNC joint (5) on three-dimensional helmholtz coil break-make device (14) according to X, Y, Z three direction, through scale (7), accurate removal helmholtz coil (3) are to the position on, first mark No. 1 small-size probe, reference scale (7) remove the coil to No. 1 probe point position department, open the total switch of the ware, Y direction switch (4), switch (4) in the X, Z direction is closed.
8. The calibration method for the calibration system of the three-dimensional multi-point magnetic probe according to claim 7, wherein: the specific steps of the S5 are as follows:
s51, calibrating a second small probe, moving a Helmholtz coil (3) to the point position of the second probe by referring to a graduated scale (7), opening a main switch of a three-dimensional Helmholtz coil on-off device (14), closing an X-direction switch (4), closing the Y-direction switch (4) and the Z-direction switch (4), and repeating the steps S3 and S4;
s52, calibrating a third-size small probe, moving the Helmholtz coil (3) to the third-size probe point position by referring to a graduated scale (7), opening a three-dimensional Helmholtz coil on-off device (14) main switch, closing a Z-direction switch (4), closing the Y-direction switch (4) and the X-direction switch (4), and repeating the steps S3 and S4; the calibration of a group of small magnetic probes (2) is completed,
s53, repeating the steps S2-S5, and completing the calibration of the whole large three-dimensional magnetic probe (2).
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| 林楚;陈晓宁;张海涛;顾超超;: "三维巨磁阻磁场传感器的电路设计和实验标定", 机电技术, no. 06, 30 December 2016 (2016-12-30), pages 64 - 67 * |
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