CN112098913B - Polar plate coil assembly for electromagnetic field calibration and electromagnetic field on-site calibration device - Google Patents
Polar plate coil assembly for electromagnetic field calibration and electromagnetic field on-site calibration device Download PDFInfo
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- CN112098913B CN112098913B CN202010974689.3A CN202010974689A CN112098913B CN 112098913 B CN112098913 B CN 112098913B CN 202010974689 A CN202010974689 A CN 202010974689A CN 112098913 B CN112098913 B CN 112098913B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
- G01R1/067—Measuring probes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
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Abstract
The invention relates to a polar plate coil assembly for electromagnetic field calibration and an electromagnetic field calibration device, wherein the polar plate coil assembly consists of two electric field polar plates and two magnetic field coils, the electromagnetic field calibration device comprises a monitoring host and a supporting device, and a low-frequency power signal source, a high-precision voltmeter, a signal switching device and a control unit are arranged in the monitoring host. When calibrating, the signal switching device switches the output signal of the low-frequency power signal source between the electric field polar plate and the magnetic field coil, and the control unit reads the probe data and compares the probe data with the theoretical electric field intensity generated by the electric field polar plate or the magnetic field intensity generated by the magnetic field coil to realize probe calibration. The invention can prolong the calibration period of the probe, reduce the metering cost and the operation and maintenance burden and improve the calibration accuracy.
Description
Technical Field
The invention belongs to the technical field of electromagnetic field measurement, relates to field calibration of a low-frequency electromagnetic field monitoring probe, and particularly relates to a polar plate coil assembly for electromagnetic field calibration and an electromagnetic field calibration device.
Background
The calibration of the probe is one of the necessary means for ensuring the accuracy of the test, and can judge whether the probe works normally or not through the calibration, and meanwhile, the latest probe calibration factor (the calibration factor can be used for correcting the actual test result) can also be obtained.
The electromagnetic field probe comprises a portable electromagnetic field probe and a fixed electromagnetic field probe, wherein the portable electromagnetic field probe and the fixed electromagnetic field probe are convenient to measure and calibrate, and the fixed electromagnetic field probe is required to be erected at a monitoring point for long-term continuous monitoring (mainly aiming at 50Hz electromagnetic radiation monitoring), so that a plurality of inconveniences exist during calibration. Firstly, the fixed monitoring point is generally built in places which are not easy to contact (such as places such as high-rise roofs and parks which are hidden), workers are required to arrive at the site for disassembly in operation and maintenance, the fixed monitoring point is reassembled after metering is completed, and the metering and calibration cost is relatively high. Secondly, the measuring yard only carries out measurement calibration on the probe rather than the whole test system when measuring and calibrating, so the data of the measurement yard has certain limitation and cannot reflect the actual accuracy of the site (particularly, the low-frequency electric field is easily influenced by external metal structures, environment and other factors).
At present, on the premise of ensuring continuous monitoring, data of a fixed point monitoring probe is often corrected by comparing the data with a portable electromagnetic field probe on site, and when the external environment changes, data instability is possibly brought, and at this time, the monitoring data of the fixed electromagnetic field probe has errors. With the increase of the probe service time, when the data changes, the change amount cannot be accurately estimated, and the latest probe correction coefficient can be obtained only through calibration once a year or two years, but the data change rule in the metering period cannot be determined.
Disclosure of Invention
In order to solve the problems pointed out in the background art, the invention provides a pole plate coil assembly for electromagnetic field calibration and an electromagnetic field on-site calibration device, so that the on-site monitoring probe can be rapidly evaluated in working state, and the accuracy of probe monitoring can be improved.
The technical scheme adopted by the invention is as follows:
the polar plate coil assembly for electromagnetic field calibration comprises two electric field polar plates and two magnetic field lines, wherein the two electric field polar plates are square, are vertically arranged in a left-right opposite mode and are fixedly connected through connecting rods made of insulating materials; the magnetic field coils are made by winding a plurality of turns of coils on a square framework, the winding methods of the coils on the two magnetic field coils are the same, and the two magnetic field coils are respectively and horizontally arranged on the upper side and the lower side of the two electric field polar plates to form a frame-shaped structure; and the two magnetic field coils are connected with the two electric field polar plates through a special magnetic field connecting wire, and a gap is reserved between the two magnetic field coils and the two electric field polar plates.
Further, the side length of the electric field polar plate is at least 2 times of the distance between the two electric field polar plates; the inner space of the two electric field polar plates is at least 3 times of the size of the electromagnetic field probe to be measured.
Further, the gap between the two magnetic field coils and the two electric field polar plates is at least 1cm.
The polar plate coil assembly for electromagnetic field calibration comprises two electric field polar plates and two magnetic field coils, wherein the magnetic field coils are formed by winding a plurality of turns of coils on the outer sides of circular frameworks, the coil winding methods of the two magnetic field coils are the same, the two magnetic field coils are arranged horizontally in a vertical opposite mode, the two magnetic field coils are connected through a special magnetic field connecting wire, and the two circular frameworks are fixedly connected through a connecting rod made of insulating materials; the two electric field polar plates are round and are respectively and horizontally arranged on the inner sides of the round frameworks of the two magnetic field coils.
Further, the magnetic field coil radius r is equal to the two magnetic field coil spacing a.
Further, the radius r of the magnetic field coil is 30cm, and the distance a between the two magnetic field coils is 30cm.
The electromagnetic field on-site calibration device comprises a monitoring host, a supporting device and the polar plate coil assembly;
the supporting device comprises a vertical supporting rod, a first transverse rod and a second transverse rod, the vertical supporting rod is vertically fixed at the middle position of the upper end face of the monitoring host, the first transverse rod is vertically fixed at the top of the vertical supporting rod, and an electromagnetic field probe to be tested can be axially and rotatably fixed at the tail end of the first transverse rod; the second transverse rod is vertically fixed at the bottom of the vertical supporting rod and can slide up and down along the vertical supporting rod; the polar plate coil assembly is rotatably fixed at the tail end of the second transverse rod;
the monitoring host is internally provided with a monitoring device comprising:
a low frequency power signal source for providing a signal to the plate coil assembly;
the high-precision voltmeter is used for monitoring the output of the low-frequency power signal source;
the signal switching device outputs the signal of the low-frequency power signal source to the two electric field polar plates or the two magnetic field coils;
the control unit is used for collecting the data of the high-precision voltmeter, reading the calibration data of the electromagnetic field probe to be detected, controlling the output frequency and amplitude of the low-frequency power signal source, controlling the output direction of the signal switching device, and enabling signals to be output to the two electric field polar plates or the two magnetic field coils;
binding posts for quick plugging are arranged on the two electric field polar plates, and plug wire holes or BNC sockets are reserved on the two magnetic field coils.
Further, the electromagnetic field on-site calibration device further comprises a U-shaped connecting piece, wherein the U-shaped connecting piece is sleeved on the first transverse rod and is fixed through a first fastening bolt; a stud is integrally and vertically arranged in the middle of the top of the U-shaped connecting piece, and the bottom of the electromagnetic field probe is screwed on the stud.
Further, the electromagnetic field on-site calibration device further comprises a first angle adjuster, the first angle adjuster comprises two first sleeve connecting parts capable of rotating relatively, and the vertical support rod and the second transverse rod are inserted into the two first sleeve connecting parts respectively and fixed through corresponding second fastening bolts.
Further, the electromagnetic field on-site calibration device further comprises a second angle adjuster, the second angle adjuster comprises a second sleeve connecting part, a first disc and a second disc, the first disc is integrally fixed on the outer side of the second sleeve connecting part, a U-shaped structure which is used for fixing a connecting rod is integrally arranged on the outer side surface of the second disc, a through hole is formed in the center of the second disc, and a waist hole used for limiting is formed in the circumferential position of the outer edge of the second disc; the center of the first original disk is provided with a screw hole, and the periphery of the first original disk is also uniformly provided with a plurality of screw holes; the second transverse rod is inserted into the second sleeve connecting part and is fixed through a third fastening bolt; the connecting rods inside the polar plate coil assemblies are fixed on the two U-shaped structures and are fixed through fourth fastening bolts; the centers of the two discs are rotationally connected through screws, and the outer edges of the two discs are limited through two screws aligned in the radial direction.
The invention has the beneficial effects that:
the calibration period of the probe can be prolonged, the metering cost and the operation and maintenance burden are reduced, and the calibration accuracy is improved.
The traditional calibration mode needs to disassemble the probe and send the probe to the detection mechanism, and the period is long, so that long-term data monitoring can be interrupted for a long time, and the data monitoring is influenced. In addition, the monitoring probe is removed to the metering hospital in the field, and the state of the probe before being reinstalled is difficult to recover one hundred percent, so that test errors can be caused theoretically. The on-site manual calibration is to perform data calibration by moving a calibration field (pole plate coil assembly) to the position of the probe, wherein the position of the probe is kept unchanged all the time in the calibration process, and the calibration factors obtained after calibration are more in line with actual conditions (such as on-site environmental influence), so that the accuracy of field detection data can be reflected more truly, and various uncertainties caused by disassembly and assembly and transportation of the probe are avoided. After the pole plate coil assembly is removed after the calibration, the probe can immediately recover the normal monitoring state, the calibration time is short, and the influence of long-term monitoring is reduced to the minimum.
Drawings
FIG. 1 is a schematic diagram of a pole plate coil assembly;
FIG. 2 is a schematic diagram of another pole plate coil assembly;
FIG. 3 is a schematic diagram of the structure of an electric field plate;
FIG. 4 is a schematic diagram of the structure of a magnetic field coil;
FIG. 5 is a schematic diagram of the structure of an electromagnetic field calibration apparatus;
FIG. 6 is a schematic view of a U-shaped connector;
FIG. 7 is a schematic view of a first angle adjuster;
FIG. 8 is a schematic structural view of a second angle adjuster;
FIG. 9 is a schematic diagram of an electromagnetic field calibration apparatus;
FIG. 10 is a flow chart of an electromagnetic field calibration apparatus calibration;
FIG. 11 is a schematic diagram of the operating state of the electromagnetic field calibration apparatus;
reference numerals: the device comprises a 1-electric field polar plate, a 2-magnetic field coil, a 3-monitoring host, a 4-vertical supporting rod, a 5-first transverse rod, a 6-second transverse rod and a 7-electromagnetic field probe.
Detailed Description
The pole plate coil assembly and the electromagnetic field calibration device for electromagnetic field calibration of the present invention are described in further detail below with reference to the accompanying drawings and specific examples.
As shown in fig. 1, the pole plate coil assembly for electromagnetic field calibration comprises two electric field pole plates 1 and two magnetic field coils 2 (mainly enameled wires), wherein the two electric field pole plates 1 are square, are vertically arranged left and right relatively, and are fixedly connected through connecting rods made of insulating materials (such as ABS materials) (refer to fig. 3). The magnetic field coils 2 are made by winding a plurality of turns of coils on a square framework, the winding methods of the coils on the two magnetic field coils 2 are the same, and the two magnetic field coils 2 are respectively and horizontally arranged on the upper side and the lower side of the two electric field polar plates 1 to form a frame-shaped structure. The two magnetic field coils 2 are connected with the two electric field polar plates 1 through a magnetic field special connecting wire (in actual use, after a first coil is wound by a metal enamelled wire, the first coil is crossed over the past second coil position, the second coil is wound and then reversely returned to the first coil along the incoming wire), the winding methods of the two coils are the same (the directions of the two coils are the same by right-hand method), a low-frequency alternating current is generated by a power signal source to pass through an injection coil, the two coils have the same-direction low-frequency alternating current, a uniform low-frequency magnetic field area is formed in the middle position of a space area surrounded by the two coils, a high-power low-resistance resistor is connected in series with the coils, an ammeter is connected in series on the circuit, the current in the injection coil is measured, or the two ends of the resistor are connected in parallel with a voltmeter, the passing current is calculated through measurement, the voltage output by the low-frequency power signal source is controlled, and thus the current in the injection coil is controlled, and the size of the generated magnetic field is also controlled. The magnitude of the magnetic field in the central region can be calculated based on the radius of the coils, the number of turns of the coils, the distance between the coils, and the theory of the current flowing through the coils).
In order to ensure the performance parameters of the calibrating device, daily monitoring is not influenced, and the calibrating requirement is met. In this embodiment, the side length of the electric field plate 1 is at least 2 times the distance between the two electric field plates 1 (the larger the size of the electric field plate 1 is, the better the alignment effect is). The inner space of the two electric field polar plates 1 is at least 3 times of the size (magnetic field sensor area) of the electromagnetic field probe 7 to be measured. The gap between the two magnetic field coils 2 and the two electric field plates 1 is at least 1cm (i.e. the magnetic field coils 2 cannot be attached to the electric field plates 1).
The invention also provides another polar plate line for electromagnetic field calibrationThe coil assembly, as shown in fig. 2, comprises two electric field polar plates 1 and two magnetic field coils 2, wherein the magnetic field coils 2 are made by winding a plurality of turns of coils on the outer sides of circular frameworks, the winding methods of the coils on the two magnetic field coils 2 are the same, the two magnetic field coils 2 are arranged horizontally and vertically relatively, the two magnetic field coils 2 are connected through a special connecting wire for magnetic field, and the two circular frameworks are fixedly connected through connecting rods made of insulating materials (combining fig. 3 and 4). The two electric field polar plates 1 are round and are respectively and horizontally arranged on the inner sides of the round frameworks of the two magnetic field coils 2. In this embodiment, the radius r of the magnetic field coil 2 is equal to the distance a between the two magnetic field coils 2. The magnetic field sensor area of the electromagnetic field probe 7 is typically no more than 100cm 2 I.e. the side length is smaller than 10cm, so that the radius r of the magnetic field coils 2 can be chosen to be 30cm and the distance a between the two magnetic field coils 2 to be 30cm.
The power signal source applies a voltage to the two electric field plates 1 through the cable, and a stable low-frequency electric field which can be used for calibrating the low-frequency electromagnetic field probe 7 is formed between the two electric field plates 1. When the probe calibration is performed, the magnetic field response of the electromagnetic field probe 7 can be detected when the electromagnetic field probe 7 is placed at the center position of the magnetic field coil 2.
As shown in fig. 5 and 9, the electromagnetic field on-site calibration apparatus includes a monitoring host 3, a support device, and the above-described pole plate coil assembly.
The supporting device comprises a vertical supporting rod 4, a first transverse rod 5 and a second transverse rod 6, wherein the vertical supporting rod 4 is vertically fixed at the middle position of the upper end face of the monitoring host 3, the first transverse rod 5 is vertically fixed at the top of the vertical supporting rod 4, and an electromagnetic field probe 7 to be tested is axially and rotationally fixed at the tail end of the first transverse rod 5. The second transverse rod 6 is vertically fixed at the bottom of the vertical support rod 4 and can slide up and down along the vertical support rod 4. The plate coil assembly is rotatably secured to the end of the second transverse rod 6.
The monitoring host 3 is internally provided with:
the low frequency power signal source is used for providing signals for the polar plate coil assembly (generating adjustable low frequency signals in the frequency range of 5Hz-400kHz, having hundred V high voltage output level and certain carrying capacity (about 30W of output power). Because the calibration test of the probe is carried out on the measuring site, the amplitude of the low frequency electric field and the amplitude of the low frequency magnetic field generated during the calibration are far greater than the amplitude level of the detection environment, the low frequency electric field and the low frequency magnetic field cannot be influenced by background radiation in the environment during the calibration, and preferably, the electric field or the magnetic field intensity used during the calibration is greater than 10 times of the field intensity of the environment electric field or the magnetic field, so that the calibration data is more accurate and reliable.
The high-precision voltmeter is used for monitoring the output of the low-frequency power signal source.
The signal switching device outputs the signal of the low-frequency power signal source to the two electric field polar plates 1 or the two magnetic field coils 2 (namely, when the low-frequency electric field calibration is needed, the electric field polar plates 1 are connected with the low-frequency power signal source, the magnetic field coils 2 are disconnected with the low-frequency power signal source at the moment, and when the low-frequency magnetic field calibration is needed, the magnetic field coils 2 are connected with the low-frequency power signal source, and at the moment, the electric field polar plates 1 are disconnected with the low-frequency power signal source).
The control unit is used for collecting data of the high-precision voltmeter, reading calibration data of the electromagnetic field probe 7 to be measured, controlling output frequency and amplitude of the low-frequency power signal source, controlling output direction of the signal switching device, and enabling signals to be output to the two electric field polar plates 1 or the two magnetic field coils 2.
Binding posts for rapid plugging are arranged on the two electric field polar plates 1, and plug wire holes or BNC sockets (convenient for introducing signal power source current signals) are reserved on the two magnetic field coils 2.
Specifically, the electromagnetic field on-site calibration device further comprises a U-shaped connecting piece, wherein the U-shaped connecting piece is sleeved on the first transverse rod 5 and is fixed through a first fastening bolt. A stud is integrally and vertically arranged at the middle position of the top of the U-shaped connecting piece, and the bottom of the electromagnetic field probe 7 is screwed on the stud, see fig. 6.
The electromagnetic field on-site calibration device further comprises a first angle adjuster, wherein the first angle adjuster comprises two first sleeve connecting parts capable of rotating relatively, and the vertical support rod 4 and the second transverse rod 6 are respectively inserted into the two first sleeve connecting parts and fixed through corresponding second fastening bolts, and see fig. 7.
The electromagnetic field on-site calibration device further comprises a second angle adjuster, the second angle adjuster comprises a second sleeve connecting part, a first disc and a second disc, the first disc is integrally fixed on the outer side of the second sleeve connecting part, the outer side face of the second disc is integrally provided with a U-shaped structure which is used for fixing a connecting rod in two purposes, the center of the second disc is provided with a through hole, and the circumferential position of the outer edge is provided with a waist hole used for limiting. The center of the first original disk is provided with a screw hole, and the periphery of the first original disk is also uniformly provided with a plurality of screw holes. The second transverse rod 6 is inserted into the second sleeve connecting part and is fixed by a third fastening bolt. The connecting rods inside the polar plate coil assemblies are fixed on the two U-shaped structures and are fixed through fourth fastening bolts. The centers of the two discs are connected through screw rotation, and the outer edges of the two discs are limited through two screws aligned in the radial direction, see fig. 8.
It should be noted that each rod in the supporting device is mainly made of an insulating material (such as a glass fiber rod) so as to avoid influencing a standard field.
The specific calibration operation flow is described as follows:
as shown in fig. 10, when calibration is started, the control unit gives a calibration command to control the low-frequency power signal source to output a required signal and power, the output power of the low-frequency power signal source is controlled in real time by detecting a signal acquired by the precision voltmeter until a required power value is given, the signal controlled by the power signal source is sent to the signal switching module, the signal switching module selects whether the signal of the power signal source is output to the electric field pole plate 1 (i.e. to perform low-frequency electric field calibration) or to the magnetic field coil 2 (i.e. to perform low-frequency magnetic field calibration) according to the instruction given by the control unit, and simultaneously, the pole plate coil assembly is manually lifted to the position of the low-frequency electromagnetic field probe 7 so that the low-frequency electromagnetic field probe 7 is located at the center point of the pole plate coil assembly (see fig. 11), and is ready for detection (the electromagnetic field probe 7 is usually erected at a height of 1.5 m when measuring, the pole plate coil assembly should be placed under the probe 7 and away from the low-frequency electromagnetic field probe 7, the distance should be greater than 1 m (e.g. 2.5 m) (see below for a specific manual calibration operation).
At this time, the low-frequency electric field measurement value or the low-frequency magnetic field measurement value of the calibrated low-frequency electromagnetic field probe 7 is transmitted to the control unit, and at the same time, the control unit reads probe calibration data from the low-frequency electromagnetic field probe 7, compares it with the theoretical electric field intensity generated by the electric field generating device (i.e., the two electric field plates 1) or the magnetic field intensity generated by the magnetic field generating device (i.e., the two magnetic field coils 2) (in the case of determination by the generating device, depending on the output voltage of the power signal source, the output voltage is measured by the voltmeter), so as to determine whether the calibrated probe data is within a normal range (e.g., within 10% of the deviation is calculated to be normal) by the deviation between the two. If normal, the calibration procedure ends. If the deviation exceeds, an electric field calibration factor and/or a magnetic field calibration factor is calculated according to the difference between the theoretical value and the measured value, and the calculated electric field calibration factor and/or the calculated magnetic field calibration factor are rewritten into the electromagnetic field probe 7. If the deviation is too large, and the calibration can be performed without correction by the probe calibration factor, the probe is abnormal and is suitable for replacement or maintenance.
Manual calibration procedure: before calibration, the pole plate coil assembly and the electromagnetic field probe 7 are respectively positioned at two sides of the vertical support rod 4. When calibration is required, the second transverse rod 6 is horizontally rotated and moved upward by the first angle adjuster, and the electromagnetic field probe 7 is positioned at the center of the plate coil assembly. After one axis of the electromagnetic field probe 7 is calibrated (the electromagnetic field probe 7 is three-axis omni-directional, and is respectively X-axis, Y-axis and Z-axis), the polar plate coil assembly is vertically rotated by the second angle adjuster, so that the other axis of the electromagnetic field probe 7 is vertically calibrated. The electromagnetic field probe 7 is then rotated 90 ° by the U-shaped connection, the last axis being calibrated. After the calibration is completed, the pole plate coil assembly is manually reset.
It should be noted that under the thought of the invention, transmission equipment such as a motor, a belt and the like can be additionally arranged at each node position, and the on-site automatic calibration work under the remote control is realized through the remote control, so that the on-site calibration of a probe by personnel is reduced or avoided.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any alternatives or modifications, which are easily conceivable by those skilled in the art within the scope of the present invention, should be included in the scope of the present invention.
Claims (8)
1. The electromagnetic field on-site calibration device is characterized by comprising a monitoring host (3), a supporting device, a polar plate coil assembly and a second angle regulator;
the supporting device comprises a vertical supporting rod (4), a first transverse rod (5) and a second transverse rod (6), wherein the vertical supporting rod (4) is vertically fixed at the middle position of the upper end face of the monitoring host machine (3), the first transverse rod (5) is vertically fixed at the top of the vertical supporting rod (4), and an electromagnetic field probe (7) to be detected can be axially and rotatably fixed at the tail end of the first transverse rod (5); the second transverse rod (6) is vertically fixed at the bottom of the vertical supporting rod (4) and can slide up and down along the vertical supporting rod (4); the polar plate coil assembly is rotatably fixed at the tail end of the second transverse rod (6);
the monitoring host (3) is internally provided with a monitoring device comprising:
a low frequency power signal source for providing a signal to the plate coil assembly;
the high-precision voltmeter is used for monitoring the output of the low-frequency power signal source;
the signal switching device outputs the signal of the low-frequency power signal source to the two electric field polar plates (1) or the two magnetic field coils (2);
the control unit is used for collecting the data of the high-precision voltmeter, reading the calibration data of the electromagnetic field probe (7) to be detected, controlling the output frequency and amplitude of the low-frequency power signal source, controlling the output direction of the signal switching device, and outputting signals to the two electric field polar plates (1) or the two magnetic field coils (2);
binding posts for rapid insertion and extraction are arranged on the two electric field polar plates (1), and plug wire holes or BNC sockets are reserved on the two magnetic field coils (2);
the pole plate coil assembly comprises two electric field pole plates (1) and two magnetic field coils (2), wherein the two electric field pole plates (1) are square, are vertically arranged left and right relatively and are fixedly connected through connecting rods made of insulating materials; the magnetic field coils (2) are manufactured by winding a plurality of turns of coils on a square framework, the winding methods of the coils on the two magnetic field coils (2) are the same, and the two magnetic field coils (2) are respectively and horizontally arranged on the upper side and the lower side of the two electric field polar plates (1) to form a frame-shaped structure; the two magnetic field coils (2) are in clearance with the two electric field polar plates (1), and the two magnetic field coils (2) are connected through a special magnetic field connecting wire;
the second angle adjuster comprises a second sleeve connecting part, a first disc and a second disc, wherein the first disc is integrally fixed on the outer side of the second sleeve connecting part, the outer side surface of the second disc is integrally provided with a U-shaped structure which is used for fixing a connecting rod, the center of the second disc is provided with a through hole, and the circumferential position of the outer edge of the second disc is provided with a waist hole for limiting; the center of the first disc is provided with a screw hole, and the periphery of the first disc is also uniformly provided with a plurality of screw holes; the second transverse rod (6) is inserted into the second sleeve connecting part and is fixed through a third fastening bolt; the connecting rods inside the polar plate coil assemblies are fixed on the two U-shaped structures and are fixed through fourth fastening bolts; the centers of the two discs are rotationally connected through screws, and the outer edges of the two discs are limited through two screws aligned in the radial direction.
2. An electromagnetic field calibration apparatus as defined in claim 1, wherein the electric field plates (1) have a side length at least 2 times the spacing of the two electric field plates (1); the inner space of the two electric field polar plates (1) is at least 3 times of the size of the electromagnetic field probe (7) to be measured.
3. An electromagnetic field calibration apparatus as defined in claim 1, wherein the gap between the two magnetic field coils (2) and the two electric field plates (1) is at least 1cm.
4. The electromagnetic field on-site calibration device is characterized by comprising a monitoring host (3), a supporting device, a polar plate coil assembly and a second angle regulator;
the supporting device comprises a vertical supporting rod (4), a first transverse rod (5) and a second transverse rod (6), wherein the vertical supporting rod (4) is vertically fixed at the middle position of the upper end face of the monitoring host machine (3), the first transverse rod (5) is vertically fixed at the top of the vertical supporting rod (4), and an electromagnetic field probe (7) to be detected can be axially and rotatably fixed at the tail end of the first transverse rod (5); the second transverse rod (6) is vertically fixed at the bottom of the vertical supporting rod (4) and can slide up and down along the vertical supporting rod (4); the polar plate coil assembly is rotatably fixed at the tail end of the second transverse rod (6);
the monitoring host (3) is internally provided with a monitoring device comprising:
a low frequency power signal source for providing a signal to the plate coil assembly;
the high-precision voltmeter is used for monitoring the output of the low-frequency power signal source;
the signal switching device outputs the signal of the low-frequency power signal source to the two electric field polar plates (1) or the two magnetic field coils (2);
the control unit is used for collecting the data of the high-precision voltmeter, reading the calibration data of the electromagnetic field probe (7) to be detected, controlling the output frequency and amplitude of the low-frequency power signal source, controlling the output direction of the signal switching device, and outputting signals to the two electric field polar plates (1) or the two magnetic field coils (2);
binding posts for rapid insertion and extraction are arranged on the two electric field polar plates (1), and plug wire holes or BNC sockets are reserved on the two magnetic field coils (2);
the pole plate coil assembly comprises two electric field pole plates (1) and two magnetic field coils (2), wherein the magnetic field coils (2) are formed by winding a plurality of turns of coils on the outer sides of circular frameworks, the coil winding methods on the two magnetic field coils (2) are the same, the two magnetic field coils (2) are arranged horizontally in an up-down opposite mode, the two magnetic field coils (2) are connected through a special connecting wire for a magnetic field, and the two circular frameworks are fixedly connected through a connecting rod made of insulating materials; the two electric field polar plates (1) are round and are respectively and horizontally arranged on the inner sides of the round frameworks of the two magnetic field coils (2);
the second angle adjuster comprises a second sleeve connecting part, a first disc and a second disc, wherein the first disc is integrally fixed on the outer side of the second sleeve connecting part, the outer side surface of the second disc is integrally provided with a U-shaped structure which is used for fixing a connecting rod, the center of the second disc is provided with a through hole, and the circumferential position of the outer edge of the second disc is provided with a waist hole for limiting; the center of the first disc is provided with a screw hole, and the periphery of the first disc is also uniformly provided with a plurality of screw holes; the second transverse rod (6) is inserted into the second sleeve connecting part and is fixed through a third fastening bolt; the connecting rods inside the polar plate coil assemblies are fixed on the two U-shaped structures and are fixed through fourth fastening bolts; the centers of the two discs are rotationally connected through screws, and the outer edges of the two discs are limited through two screws aligned in the radial direction.
5. An electromagnetic field calibration apparatus as defined in claim 4, wherein the radius r of the magnetic field coils (2) is equal to the spacing a of the two magnetic field coils (2).
6. An electromagnetic field calibration apparatus as defined in claim 4, wherein the radius r of the magnetic field coils (2) is 30cm, and the distance a between the two magnetic field coils (2) is 30cm.
7. Electromagnetic field calibration apparatus as defined in claim 1 or 4, further comprising a U-shaped connector which is sleeved on the first transverse rod (5) and fixed by means of a first fastening bolt; a stud is integrally and vertically arranged in the middle of the top of the U-shaped connecting piece, and the bottom of the electromagnetic field probe (7) is screwed on the stud.
8. The electromagnetic field calibration apparatus as defined in claim 1 or 4, further comprising a first angle adjuster, wherein the first angle adjuster comprises two first sleeve connecting portions capable of rotating relatively, and the vertical support rod (4) and the second transverse rod (6) are respectively inserted into the two first sleeve connecting portions and fixed by corresponding second fastening bolts.
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| CN201583645U (en) * | 2009-12-22 | 2010-09-15 | 中国舰船研究设计中心 | Low-frequency electromagnetic field calibrator |
| CN203275629U (en) * | 2013-04-16 | 2013-11-06 | 宿奉祥 | Power frequency magnetic field probe calibration tester |
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