CN117289038A - Electric field measuring device, system and method - Google Patents
Electric field measuring device, system and method Download PDFInfo
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- CN117289038A CN117289038A CN202311261614.0A CN202311261614A CN117289038A CN 117289038 A CN117289038 A CN 117289038A CN 202311261614 A CN202311261614 A CN 202311261614A CN 117289038 A CN117289038 A CN 117289038A
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- 230000005684 electric field Effects 0.000 title claims abstract description 291
- 238000000034 method Methods 0.000 title abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims description 83
- 239000002184 metal Substances 0.000 claims description 83
- 238000005259 measurement Methods 0.000 claims description 30
- 238000000691 measurement method Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 4
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- 230000005686 electrostatic field Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
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- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 239000012212 insulator Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- G01R29/12—Measuring electrostatic fields or voltage-potential
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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
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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Abstract
The application relates to an electric field measuring device, an electric field measuring system and an electric field measuring method, wherein a rear-end signal is obtained after signal processing generated by a differential electrode, and the rear-end signal is converted into an alternating current electric field signal of an electric field through low-pass filtering. The rear end signal is multiplied by the driving signal of the electromagnetic member and then is subjected to low-pass filtering to be converted into a direct current electric field signal of an electric field. If the alternating current electric field signal is zero, the direct current electric field signal is not zero, the electric field is a direct current electric field, and the electric field signal of the electric field is a direct current electric field signal, if the direct current electric field signal is zero, the electric field is an alternating current electric field, and the electric field signal of the electric field is an alternating current electric field signal, if the direct current electric field signal is not zero, the alternating current electric field signal is not zero, the electric field is an alternating current/direct current electric field, and the electric field signal of the electric field is an alternating current electric field signal and a direct current electric field signal, thereby realizing the electric field type judgment of the position electric field, namely direct current or alternating current or direct current, and simultaneously respectively obtaining the alternating current electric field signal and the direct current electric field signal.
Description
Technical Field
The present disclosure relates to the field of electric power measurement technologies, and in particular, to an electric field measurement device, system, and method.
Background
With the rapid development of the electric power industry in China, especially the construction requirement of alternating current-direct current extra-high voltage engineering, the measurement problems of direct current electric field, long air gap discharge field intensity, field intensity below a power transmission line and near power transmission and transformation equipment, field intensity near an insulator along surface and the like of a direct current convertor station valve hall are more and more focused and valued. The accurate acquisition of the electric field information has important significance for safe operation of the electric power system and optimal design of electric equipment. At present, the application field of high-voltage engineering field to electric field measurement is various, and stronger adaptability and detectability electric field detection device is required.
Among several monitoring devices (sensors) in the prior art, photoelectric effect electric field sensors have better measurement response to high-frequency and ultrahigh-frequency electric fields, high linearity and high test frequency, but are difficult to measure electrostatic fields, weak in temperature stability and uncontrollable in optical bias. Electric field sensors such as D-dot, piezoelectric piezoresistance and the like are difficult to solve the problem of electrostatic field measurement; although the MEMS resonance type electric field sensor can measure the electrostatic field, the manufacturing cost is high, the manufacturing difficulty is high, and the yield is low; the field grinder can measure an alternating current-direct current electric field, but the field grinder is large in size and is difficult to be embedded into part of electric appliance structures to measure the electric field.
Therefore, the electric field detection device in the prior art is complex in manufacture, complicated in use process, large in size, and incapable of detecting the ac/dc electric field at the same time.
Disclosure of Invention
Based on this, it is necessary to provide an electric field measuring device, system and method for solving the problems that the electric field detecting device in the prior art is complex in manufacturing, complicated in using process, or large in size, and cannot detect the ac/dc electric field at the same time.
An electric field measurement apparatus, the electric field measurement apparatus comprising:
a housing;
the top metal sheet is positioned in the shell and is connected with the top of the shell;
the cantilever metal assembly is positioned in the shell and comprises a cantilever metal sheet, and the side edge of the cantilever metal sheet is connected with the side wall of the shell and is arranged at intervals in parallel with the top metal sheet;
the electromagnetic piece is arranged in the shell, is arranged at the bottom of the shell and is electrified with alternating current.
When the electric field measuring device is in actual use, the electric field measuring device is arranged on a power transmission line accessory to be detected, then alternating current is introduced into the electromagnetic part to generate an alternating current magnetic field to drive the cantilever metal sheet to vibrate, so that the cantilever metal sheet and the top metal sheet form a differential electrode, namely a variable capacitance, a rear-end signal is obtained after the signal generated by the differential electrode is processed, and the rear-end signal is converted into an alternating current electric field signal of an electric field through low-pass filtering. The rear end signal is multiplied by the driving signal of the electromagnetic member and then is subjected to low-pass filtering to be converted into a direct current electric field signal of an electric field. If the alternating current electric field signal is zero, the direct current electric field signal is not zero, the electric field is a direct current electric field, and the electric field signal of the electric field is a direct current electric field signal, if the direct current electric field signal is zero, the electric field is an alternating current electric field, and the electric field signal of the electric field is an alternating current electric field signal, if the direct current electric field signal is not zero, the alternating current electric field signal is not zero, the electric field is an alternating current/direct current electric field, and the electric field signal of the electric field is an alternating current electric field signal and a direct current electric field signal, thereby realizing the electric field type judgment of the position electric field, namely direct current or alternating current or direct current, and simultaneously respectively obtaining the alternating current electric field signal and the direct current electric field signal.
In an embodiment, the cantilever metal assembly includes a plurality of connection members, one end of each connection member is connected to the cantilever metal sheet, the other end is connected to the side wall of the housing, and the plurality of connection members are uniformly arranged around the circumference of the cantilever metal sheet.
In one embodiment, the cantilever metal sheet is a magnetic metal sheet.
In an embodiment, the cantilever metal assembly further comprises a magnetic member connected to a side of the cantilever metal sheet remote from the top metal sheet, the cantilever metal sheet being a non-magnetic metal.
In one embodiment, the electromagnetic member comprises an enameled coil and a central cylinder, the enameled coil being wound around the central cylinder.
In an embodiment, the electromagnetic member comprises a PCB board on which the coil is drawn.
An embodiment of the present application further provides an electric field measurement system, including: the first low-pass filter, the second low-pass filter, the multiplier, the instrument amplifier and the electric field measuring device;
the differential electrode formed by the top metal sheet and the cantilever metal sheet is connected with the instrument amplifier;
the first low-pass filter is connected with the instrument amplifier and used for obtaining an alternating current electric field signal of an electric field;
the multiplier is connected with the instrument amplifier, the electromagnetic piece is connected with the multiplier, and the multiplier is used for multiplying the signal of the instrument amplifier with the magnetic field driving signal of the electromagnetic piece;
the second low-pass filter is connected with the multiplier and is used for carrying out low-pass filtering on the signal obtained by multiplying the signal of the instrument amplifier and the magnetic field driving signal of the electromagnetic piece so as to obtain a direct current electric field signal of the electric field.
The electric field measuring device is arranged on a power transmission line accessory to be detected, then alternating current is introduced into the electromagnetic piece to generate an alternating current magnetic field to drive the cantilever metal sheet to vibrate, so that a differential electrode, namely a variable capacitance, is formed between the cantilever metal sheet and the top metal sheet, a rear-end signal is obtained after signal processing generated by the differential electrode, and the rear-end signal is converted into an alternating current electric field signal of an electric field through low-pass filtering. The rear end signal is multiplied by the driving signal of the electromagnetic member and then is subjected to low-pass filtering to be converted into a direct current electric field signal of an electric field. If the alternating current electric field signal is zero, the direct current electric field signal is not zero, the electric field is a direct current electric field, and the electric field signal of the electric field is a direct current electric field signal, if the direct current electric field signal is zero, the electric field is an alternating current electric field, and the electric field signal of the electric field is an alternating current electric field signal, if the direct current electric field signal is not zero, the alternating current electric field signal is not zero, the electric field is an alternating current/direct current electric field, and the electric field signal of the electric field is an alternating current electric field signal and a direct current electric field signal, thereby realizing the electric field type judgment of the position electric field, namely direct current or alternating current or direct current, and simultaneously respectively obtaining the alternating current electric field signal and the direct current electric field signal.
In one embodiment, the frequency of the alternating current passing through the electromagnetic member is 200Hz.
In an embodiment, the cut-off frequency of the first low-pass filter is less than 150Hz and the cut-off frequency of the second low-pass filter is less than 5Hz.
An embodiment of the present application further provides an electric field measurement method, using the electric field measurement system to perform electric field measurement, where the electric field measurement method includes the following steps:
the signal generated by the differential electrode is input to the instrument amplifier and is converted into a rear-end signal by the instrument amplifier;
the back-end signal is input to the first low-pass filter and converted into an alternating electric field signal of the electric field through the first low-pass filter;
the back-end signal is input to a multiplier, and the multiplier multiplies the back-end signal by the magnetic field driving signal and then inputs the multiplied back-end signal to the second low-pass filter, and the multiplied back-end signal is converted into a direct-current electric field signal of the electric field through the second low-pass filter.
The electric field measuring device is arranged on a power transmission line accessory to be detected, then alternating current is introduced into the electromagnetic piece to generate an alternating current magnetic field to drive the cantilever metal sheet to vibrate, so that a differential electrode, namely a variable capacitance, is formed between the cantilever metal sheet and the top metal sheet, a rear-end signal is obtained after signal processing generated by the differential electrode, and the rear-end signal is converted into an alternating current electric field signal of an electric field through low-pass filtering. The rear end signal is multiplied by the driving signal of the electromagnetic member and then is subjected to low-pass filtering to be converted into a direct current electric field signal of an electric field. If the alternating current electric field signal is zero, the direct current electric field signal is not zero, the electric field is a direct current electric field, and the electric field signal of the electric field is a direct current electric field signal, if the direct current electric field signal is zero, the electric field is an alternating current electric field, and the electric field signal of the electric field is an alternating current electric field signal, if the direct current electric field signal is not zero, the alternating current electric field signal is not zero, the electric field is an alternating current/direct current electric field, and the electric field signal of the electric field is an alternating current electric field signal and a direct current electric field signal, thereby realizing the electric field type judgment of the position electric field, namely direct current or alternating current or direct current, and simultaneously respectively obtaining the alternating current electric field signal and the direct current electric field signal.
Drawings
Fig. 1 is a schematic structural diagram of an electric field measurement device according to an embodiment.
Fig. 2 is a schematic diagram of the electric field measuring apparatus of fig. 1 after installation.
Fig. 3 is a flowchart of signal processing during use of the electric field measuring apparatus of fig. 1.
Reference numerals illustrate:
100-electric field measuring device;
110-a housing;
120-top sheet metal;
130-cantilever metal assembly; 131-cantilever metal sheets; 132-a connector; 133-magnetic member;
140-electromagnetic member;
150-differential electrodes; 151-an instrumentation amplifier; 152-a first low pass filter; 153-multiplier; 154-magnetic field drive signal; 155-a second low pass filter; 156-direct current electric field signal; 157-an alternating electric field signal;
210-power line;
220-ground.
Detailed Description
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.
In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms refer to the orientation or positional relationship based on the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.
In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an electric field measurement apparatus 100 according to an embodiment of the present application, where the electric field measurement apparatus 100, as shown in fig. 2, is disposed on a ground 220 for detecting a current of a power transmission line 210, and includes: housing 110 and top metal sheet 120 within housing 110, cantilevered metal assembly 130 within housing 110, and solenoid 140 within housing 110.
In the electric field measuring apparatus 100, the top metal sheet 120 is connected to the top of the housing 110, the cantilever metal assembly 130 includes a cantilever metal sheet 131, and the side edge of the cantilever metal sheet 131 is connected to the side wall of the housing 110 and is parallel to the top metal sheet 120, and the electromagnetic member 140 is disposed at the bottom of the housing 110 and is connected to an ac current.
In practical use, the electric field measuring device 100 is disposed near the power transmission line 210 to be detected, then an ac current is applied to the inside of the electromagnetic member 140 to generate an ac magnetic field to drive the cantilever metal sheet 131 to vibrate, so that the cantilever metal sheet 131 and the top metal sheet 120 form a differential electrode 150, i.e. a variable capacitor, and the signal generated by the differential electrode 150 is processed to obtain a back-end signal, and the back-end signal is converted into an ac electric field signal 157 of the electric field through low-pass filtering. The back-end signal is multiplied by the driving signal of the electromagnet 140 and then low-pass filtered to be converted into a dc electric field signal 156 of the electric field. If the ac electric field signal 157 is zero and the dc electric field signal 156 is not zero, the electric field is a dc electric field, and the electric field signal of the electric field is a dc electric field signal 156, if the dc electric field signal 156 is zero and the ac electric field signal 157 is not zero, the electric field is an ac electric field, and the electric field signal of the electric field is an ac electric field signal 157, and if the dc electric field signal 156 is not zero, the ac electric field signal 157 is not zero, and the electric field signal of the electric field is an ac electric field signal 157 and a dc electric field signal 156, respectively, thereby realizing the electric field type determination of the position electric field, that is, whether it is dc or ac or dc, and simultaneously obtaining the ac electric field signal 157 and the dc electric field signal 156, respectively.
In an embodiment, the cantilever metal assembly 130 includes a plurality of connecting members 132, one end of the connecting member 132 is connected to the cantilever metal sheet 131, and the other end is connected to the sidewall of the housing 110, and the plurality of connecting members 132 are uniformly disposed around the circumference of the cantilever metal sheet 131, so that the cantilever metal sheet 131 can be connected to the sidewall of the housing 110 more uniformly, so that the vibration force of the cantilever metal sheet 131 is distributed more uniformly around the circumference of the cantilever metal sheet 131, and the highest point and the lowest point of the vibration of the cantilever metal sheet 131 are located at the center of the cantilever metal sheet 131.
In one embodiment, the cantilever metal 131 is a magnetic metal, such that the ac magnetic field generated by the electromagnetic member 140 vibrates the cantilever metal 131.
In an embodiment, the cantilever metal assembly 130 further includes a magnetic member 133, where the magnetic member 133 is connected to a side of the cantilever metal sheet 131 away from the top metal sheet 120, and the cantilever metal sheet 131 is made of a non-magnetic metal, so that the non-magnetic cantilever metal sheet 131 can be influenced by the magnetic member 133 and form a magnetic metal sheet assembly with the magnetic member 133, which can vibrate under the influence of an ac electric field, so as to form the differential electrode 150 with the top metal sheet.
Specifically, the magnetic member 133 is a thin rubidium magnet.
In one embodiment, the solenoid 140 includes an enameled coil and a central cylinder, the enameled coil being wound around the central cylinder.
Specifically, the enameled coil has 500 turns.
In one embodiment, the electromagnetic member 140 includes a PCB board with coils drawn thereon, thereby forming an electromagnetic member, and an ac magnetic field is formed when ac is applied to the coils on the PCB board.
Referring to fig. 3, an embodiment of the present application further provides an electric field measurement system, where the electric field measurement system includes: a first low-pass filter 152, a second low-pass filter 155, a multiplier 153, an instrumentation amplifier 151, and an electric field measuring device.
The differential electrode 150 of top metal sheet and cantilever metal sheet is connected to an instrumentation amplifier 151. The first low pass filter 152 is connected to the instrumentation amplifier 151 for obtaining an alternating electric field signal 157 of the electric field. The multiplier 153 is connected to the instrumentation amplifier 151, and the electromagnetic member is connected to the multiplier 153, and the multiplier 153 is configured to multiply the signal of the instrumentation amplifier 151 with the magnetic field driving signal 154 of the electromagnetic member. The second low-pass filter 155 is connected to the multiplier 153 for low-pass filtering the signal multiplied by the signal of the instrumentation amplifier 151 and the magnetic field driving signal 154 of the electromagnetic member to obtain a direct current electric field signal 156 of the electric field. The electric field measuring device 100 is arranged on the power transmission line 210 accessory to be detected, then alternating current is introduced into the electromagnetic member 140 to generate an alternating current magnetic field to drive the cantilever metal sheet 131 to vibrate, so that the cantilever metal sheet 131 and the top metal sheet 120 form a differential electrode 150, namely a variable capacitor, a signal generated by the differential electrode 150 is processed to obtain a rear-end signal, and the rear-end signal is converted into an alternating current electric field signal 157 of an electric field through low-pass filtering. The back-end signal is multiplied by the driving signal of the electromagnet 140 and then low-pass filtered to be converted into a dc electric field signal 156 of the electric field. If the ac electric field signal 157 is zero and the dc electric field signal 156 is not zero, the electric field is a dc electric field, and the electric field signal of the electric field is a dc electric field signal 156, if the dc electric field signal 156 is zero and the ac electric field signal 157 is not zero, the electric field is an ac electric field, and the electric field signal of the electric field is an ac electric field signal 157, and if the dc electric field signal 156 is not zero, the ac electric field signal 157 is not zero, and the electric field signal of the electric field is an ac electric field signal 157 and a dc electric field signal 156, respectively, thereby realizing the electric field type determination of the position electric field, that is, whether it is dc or ac or dc, and simultaneously obtaining the ac electric field signal 157 and the dc electric field signal 156, respectively.
In one embodiment, the frequency of the alternating current passing through the electromagnet is 200Hz.
In one embodiment, the cutoff frequency of the first low pass filter 152 is less than 150Hz and the cutoff frequency of the second low pass filter 155 is less than 5Hz.
Referring to fig. 3, an embodiment of the present application further provides an electric field measurement method, where an electric field measurement system is used to perform electric field measurement, the electric field measurement method includes the following steps:
the signal generated by the differential electrode 150 is input to the instrumentation amplifier 151 and converted into a back-end signal by the instrumentation amplifier 151
Back end signalThe alternating electric field signal 157 is input to the first low-pass filter 152 and converted into an electric field by the first low-pass filter 152.
The back-end signal is input to the multiplier 153, and the multiplier 153 outputs the back-end signalAnd magnetic field driving signal->Multiplying. The multiplied signal obtained by multiplier 153 isThe multiplied signals are then input to a second low-pass filter 155, and the signals are filtered by the second low-pass filter 155 to obtain a dc level signal ab, and the dc level signal ab is divided by a to obtain a dc electric field signal 156 of the electric field.
The electric field measuring device 100 is arranged on the power transmission line 210 accessory to be detected, then alternating current is introduced into the electromagnetic member 140 to generate an alternating current magnetic field to drive the cantilever metal sheet 131 to vibrate, so that the cantilever metal sheet 131 and the top metal sheet 120 form a differential electrode 150, namely a variable capacitor, a signal generated by the differential electrode 150 is processed to obtain a rear-end signal, and the rear-end signal is converted into an alternating current electric field signal 157 of an electric field through low-pass filtering. The back-end signal is multiplied by the driving signal of the electromagnet 140 and then low-pass filtered to be converted into a dc electric field signal 156 of the electric field. If the ac electric field signal 157 is zero and the dc electric field signal 156 is not zero, the electric field is a dc electric field, and the electric field signal of the electric field is a dc electric field signal 156, if the dc electric field signal 156 is zero and the ac electric field signal 157 is not zero, the electric field is an ac electric field, and the electric field signal of the electric field is an ac electric field signal 157, and if the dc electric field signal 156 is not zero, the ac electric field signal 157 is not zero, and the electric field signal of the electric field is an ac electric field signal 157 and a dc electric field signal 156, respectively, thereby realizing the electric field type determination of the position electric field, that is, whether it is dc or ac or dc, and simultaneously obtaining the ac electric field signal 157 and the dc electric field signal 156, respectively.
Wherein a is the drive signal amplitude, w 1 In order to drive the frequency of the signal,for the drive signal phase, b is the output signal amplitude, csin (w 2 t+δ) is the other noise signal.
Specifically, the signals of the differential electrodes 150 may be transferred to the signal amplifier by wireless transmission or the like.
Specifically, the signal generated by the first low-pass filter 152 and the signal generated by the second low-pass filter 155 may be transmitted to the terminal for processing by wireless transmission or the like.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. An electric field measurement apparatus, characterized in that the electric field measurement apparatus comprises:
a housing;
the top metal sheet is positioned in the shell and is connected with the top of the shell;
the cantilever metal assembly is positioned in the shell and comprises a cantilever metal sheet, and the side edge of the cantilever metal sheet is connected with the side wall of the shell and is arranged at intervals in parallel with the top metal sheet;
the electromagnetic piece is arranged in the shell, is arranged at the bottom of the shell and is electrified with alternating current.
2. The electric field measuring apparatus of claim 1, wherein the cantilever metal assembly comprises a plurality of connection members, one end of each of the connection members is connected to the cantilever metal sheet, the other end is connected to the side wall of the housing, and the plurality of connection members are uniformly arranged around the circumference of the cantilever metal sheet.
3. The electric field measurement device of claim 2, wherein the cantilever metal sheet is a magnetic metal sheet.
4. The electric field measurement apparatus of claim 2, wherein the cantilever metal assembly further comprises a magnetic member coupled to a side of the cantilever metal sheet remote from the top metal sheet, the cantilever metal sheet being a non-magnetic metal.
5. The electric field measurement device of claim 1, wherein the electromagnetic member comprises an enameled coil and a central cylinder, the enameled coil being wound around the central cylinder.
6. The electric field measurement device of claim 1, wherein the electromagnetic member comprises a PCB board having a coil drawn thereon.
7. An electric field measurement system, the electric field measurement system comprising: a first low pass filter, a second low pass filter, a multiplier, an instrumentation amplifier, and an electric field measurement device according to any one of claims 1-6;
the differential electrode formed by the top metal sheet and the cantilever metal sheet is connected with the instrument amplifier;
the first low-pass filter is connected with the instrument amplifier and used for obtaining an alternating current electric field signal of an electric field;
the multiplier is connected with the instrument amplifier, the electromagnetic piece is connected with the multiplier, and the multiplier is used for multiplying the signal of the instrument amplifier with the magnetic field driving signal of the electromagnetic piece;
the second low-pass filter is connected with the multiplier and is used for carrying out low-pass filtering on the signal obtained by multiplying the signal of the instrument amplifier and the magnetic field driving signal of the electromagnetic piece so as to obtain a direct current electric field signal of the electric field.
8. The electric field measurement system of claim 7, wherein the alternating current passing through the electromagnetic member has a frequency of 200Hz.
9. The electric field measurement system of claim 8, wherein the cutoff frequency of the first low pass filter is less than 150Hz and the cutoff frequency of the second low pass filter is less than 5Hz.
10. An electric field measurement method using the electric field measurement system as set forth in claims 7 to 9, characterized in that the electric field measurement method comprises the steps of:
the signal generated by the differential electrode is input to the instrument amplifier and is converted into a rear-end signal by the instrument amplifier;
the back-end signal is input to the first low-pass filter and converted into an alternating electric field signal of the electric field through the first low-pass filter;
the back-end signal is input to a multiplier, and the multiplier multiplies the back-end signal by the magnetic field driving signal and then inputs the multiplied back-end signal to the second low-pass filter, and the multiplied back-end signal is converted into a direct-current electric field signal of the electric field through the second low-pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202311261614.0A CN117289038A (en) | 2023-09-27 | 2023-09-27 | Electric field measuring device, system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311261614.0A CN117289038A (en) | 2023-09-27 | 2023-09-27 | Electric field measuring device, system and method |
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| CN117289038A true CN117289038A (en) | 2023-12-26 |
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Citations (9)
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