CN104408997B - Novel static electric field drawing apparatus - Google Patents

Novel static electric field drawing apparatus Download PDF

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Publication number
CN104408997B
CN104408997B CN201410618970.8A CN201410618970A CN104408997B CN 104408997 B CN104408997 B CN 104408997B CN 201410618970 A CN201410618970 A CN 201410618970A CN 104408997 B CN104408997 B CN 104408997B
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stepper motor
probe
row
capture cards
mouths
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CN104408997A (en
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石明吉
王生钊
刘忠超
丁淑娟
郝清海
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Nanyang Institute of Technology
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B23/00Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
    • G09B23/06Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
    • G09B23/18Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism

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  • General Physics & Mathematics (AREA)
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  • Pure & Applied Mathematics (AREA)
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  • Computational Mathematics (AREA)
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  • Educational Technology (AREA)
  • Theoretical Computer Science (AREA)
  • Testing Of Individual Semiconductor Devices (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

The present invention relates to a kind of full automatic novel static electric field drawing apparatus, belong to physics experiment teaching apparatus field.The system uses host computer as key control unit, can automatic data collection, display and the potential data for storing simulation yard plus capture card, single-chip microcomputer, stepper motor driver, stepper motor etc..Specifically include host computer, RS485 capture cards, RS485 and turn 232 bidirectional transducers, RS232 connecting lines, STC89C52 single chip, lead screw guide rails, stepper motor driver, stepper motor, electroded water box, row's probe, voltage-stabilized power supply.This invention removes not coaxial error, and arranging the scanning of probe and the collection of data realizes automation, substantially increases the efficiency of data acquisition.While collection, upper computer software draws the equipotential lines distribution map of colour automatically, and automatically saves data and equipotential lines distribution pattern.Measuring speed is fast, and precision is high, simple to operate.

Description

Novel static electric field drawing apparatus
Technical field
The invention belongs to experiment teaching instrument field, and in particular to a kind of novel static electric field for physics experiment teaching is retouched Paint instrument.
Technical background
Current electrostatic field scanner can be divided into according to the difference of conducting medium:Conductive paper electrostatic field scanner, electrolyte Electrostatic field scanner and conducting glass electrostatic field plotting instrument.The first is to be led to using the conductive paper for scribbling graphite as dielectric Probe and pilot pin are crossed, realizes quantitative record and data analysis;Second is to make dielectric instead of conductive paper with water, and method is The fixed electrode in a transparent lucite tank, then loads onto appropriate water in the sink, is put into the lower floor of experiment frame Tested;The third is to make dielectric with conductive crystallite.
With conductive paper as dielectric exist the defects of have:(1) electrically conductive layer applies uneven on conductive paper, conductive paper resistance Poor in all directions uniformity, such electric current field distribution is with being modeled electrostatic field distribution not exclusively so that experiment is accurate Degree, repeatability are poor;(2) contact of the electrode with conductive paper is uneven, contact of the probe with conductive paper can because people, number of dimensions and It is different so that contact resistance is unstable, influences rendering results;(3) when measuring, probe contacts mobile on conductive paper and repeats to connect Touch so that conductive paper is damaged, so on the one hand directly affects the electric conductivity of conductive paper, influences experiment effect;The opposing party's face The service life of conductive paper is rung, conductive paper is frequently changed, increases experimental cost.`
With conductive crystallite as dielectric come to make dielectric shortcoming instead of conductive paper be conductive crystallite price, it is and conductive micro- It is brilliant fragile.
Although with water come instead of conductive paper make dielectric there is also it is certain the defects of, such as:(1) water electrolysis produces bubble and is attached to Electrode surface.(2) moisture muon polarization, producing bound charge influences simulation yard;(3) need to change water, and water has simulation effect Influence.But because water is cheap, be easy to draw materials, therefore, do that electrolyte carries out static field description with water is still main flow.
It can be divided into double-deck two kinds of drawing apparatus and individual layer drawing apparatus by structure difference.It is quiet used in many colleges and universities laboratory at present Electric field drawing apparatus mostly describes analog electrostatic field using the drawing apparatus of double-decker.Two probes consolidates above and below existing instrument connection Determine that handle set quality is larger, it is very big with the frictional force of experimental bench, it is difficult to control its shift position when mobile.Especially from quiet Only to the moment of motion and when voltmeter reading with reference to position voltage to be measured very close to minor adjustments are needed, it is difficult to control standard Really, thus cause error larger, influence experiment effect, add the difficulty of experiment.In addition, the drawing apparatus of double-decker easily produces Raw " not coaxial error ".When bilevel probe not on the same axis, if do not rotated when describing, resulting electrostatic Field distribution can be described as the translation of tested electric field.But, it is desirable to it is highly difficult not have to rotate when describing.When having rotation, sitting Retouched on millimeter paper etc. site, will have error between actual Electric Field Distribution situation, i.e., " not coaxial error ".
Conventional electrostatic field drawing apparatus the site such as will first find when describing electrostatic field.And the method in the site such as searching is to use Voltage meter is everywhere measured by describing probe in tested field regime, the reading of voltage meter is observed when looking for, when voltage meter When reading is setting value, stop probe, then by point mark on graph paper.This artificial method efficiency sought a little is very low.
From the trend of tester development, total trend is automation, intelligent, efficient.Quality can be utilized Higher data acquisition and displaying scheme, the description of electrostatic field is realized in more easily method.With science and technology progress, Design using host computer as main control centre, its advantage will progressively be shown.In a final design, we design a kind of new Electrostatic field scanner, automation is all realized into the movement of probe, the quantization of data, the collection of data, display of data etc., carried High efficiency, reduce cost.
The content of the invention
To solve the above problems, the present invention proposes a kind of novel static electric field drawing apparatus.It has been inherently eliminated and has not missed coaxially Difference, substantially increase the efficiency of data acquisition, draw automatically in real time colour equipotential lines distribution map and can automatically save data and Equipotential lines distribution pattern.
The technical solution adopted by the present invention is:The novel static electric field drawing apparatus is by data collecting system, row's probe scanning system System, host computer three parts are formed, and electric field Survey and map software is arranged in host computer, data collecting system collection row's probe scanning The voltage signal of system detection, and transmit to host computer, it is characterised in that:The data collecting system is by row's probe, first RS485 capture cards, the 2nd RS485 capture cards, RS485 turn 232 bidirectional transducers, simulation yard to be measured, 12V constant voltage dc sources and Simulation yard is formed with constant voltage dc source;Row's probe shares 40 probes, and numbering is followed successively by 1,2,3 ... 40, wherein, No. 1-20 Analog input end AIN1-20 of the probe respectively with the first RS485 capture cards is connected;21-40 probes are adopted with the 2nd RS485 respectively The analog input end AIN1-20 connections of truck;12V constant voltage dc sources are the first RS485 capture cards and the 2nd RS485 capture cards Power supply, the 485G of the first RS485 capture cards be followed by RS485s in parallel with the 485G of the 2nd RS485 capture cards turn 232 bi-directional conversions The GND of device, the 485A+ of the first RS485 capture cards be followed by RS485 in parallel with the 485A+ of the 2nd RS485 capture cards turn 232 pairs To the T/R+ of converter, the 485B- of the first RS485 capture cards is in parallel with the 485B- of the 2nd RS485 capture cards to be followed by RS485 Turn the T/R- of 232 bidirectional transducers;RS485 turns the serial ports end of 232 bidirectional transducers and the serial ports of host computer connects;Simulation to be measured Field, which is placed in, to be described on platform, and two binding posts of simulation yard to be measured connect with the both positive and negative polarity of simulation yard constant voltage dc source respectively Connect, simulation yard to be measured is electrolyte analog electrostatic field;The COM of first RS485 capture cards and the COM of the 2nd RS485 capture cards are simultaneously Connection is followed by the negative pole of simulation yard constant voltage dc source;
Probe scanning system is arranged by single-chip microcomputer, stepper motor driver, stepper motor, lead screw guide rails and stepper drive power supply Form, stepper motor is connected with stepper motor driver, and stepper motor driver is connected with stepper drive power supply, and stepper motor drives PUL+ the and DIR+ parallel connections of dynamic device are followed by the P40 mouths of single-chip microcomputer, and the PUL-PUL of stepper motor driver connects the P8 mouths of single-chip microcomputer, The DIR-DIR of stepper motor driver connects the P7 mouths of single-chip microcomputer, the P20 mouths ground connection of single-chip microcomputer, P18 mouths and the P19 mouths of single-chip microcomputer An indirect 11.0592MHz crystal oscillator, the P10 mouths and P11 mouths of single-chip microcomputer pass through the USB interface of USB line and host computer and connected Connect;The orientation of row's probe and leading screw it is axially vertical, row's probe links together through crossbeam and metallic rod, metallic rod In insertion sleeve, sleeve is fixed on magnet base, and magnet base is locked in lead screw guide rails using magnetic force.
Row's probe arranges pin by 40P and Du Pont's dress rehearsal wire is formed, and row's pin is single minute hand, and the spacing of pin is 2.54mm, The long 30mm of pin, Du Pont's dress rehearsal wire are 40P dress rehearsal wires.
The step angle of the stepper motor is 1.8 °, and the screw lead of lead screw guide rails is 4mm, pulse period 2ms, and row visits Pin moves 0.02mm in vertical direction.
The electric field Survey and map software presses following process flow operations:
(1)Start;
(2)2 parameters of 1 parameter of communication and communication are set;1 parameter of communication is set, selected after click at serial port setting interface COM1;After setting communication 2 parameters click COM3 is selected at serial port setting interface;
(3)Select scan mode;
(4)Sampling period is set;
(5)Draw;
(6)Preserve;
(7)Terminate.
Using the beneficial effect of above-mentioned technical proposal:The sites such as searching are needed when traditional electrostatic field scanner works, are led to Normal way is everywhere measured in tested simulation yard with the probe of connection voltage meter, and one side traveling probe is while observation volt Table, when the reading of voltage meter is setting value, stop traveling probe, by point mark on graph paper.Then above-mentioned behaviour is repeated Make, untill the number of point is enough, substantially can describe the distribution situation of equipotential lines, so, the efficiency sought a little is especially low. The present invention is directly quantified and gathered the potential value of measurement point using host computer by capture card, and simulation yard is directly given by software Equipotential lines distribution map;Using single-chip microcomputer, stepper motor driver, stepper motor and lead screw guide rails realize the shifting for arranging probe location It is dynamic, so as to the longitudinal scanning movement of the row's of realization probe, to reach to simulation yard certain area(Area 99.06mm × 99.06mm) The automatic measurement of each point potential value in the point of square control network that the length of side is 2.54mm.While each point potential data are obtained, profit Drawn with software, the potential value of diverse location is represented in drawing area correspondence position with different colors, so as to To intuitively colored potential profile.It is completed, data and picture can be preserved and exported.Not only efficiency high, and accurately Degree is high.In addition, the present invention uses the potential value of row's probe direct measurement each point, the equipotential lines of simulation yard is directly given using software Distribution map.The data of output can utilize Origin softwares or Mat lab softwares further analysis and research.With conventional bilayer Electrostatic field scanner is compared, and fundamentally overcomes not coaxial error, avoid rendering results and actual Electric Field Distribution situation it Between difference.Row's scanning of probe, the quantization of data, collection, storage realize automation, substantially increase data acquisition Efficiency.
Due to making electrolyte using water, with it is conventional make dielectric using conductive paper compared with, in the absence of conductive paper because of conduction The problems such as thin layer smearing is uneven, and electrode makes conductive paper breakage with conductive paper loose contact and duplicate measurements.With conventional use Conductive crystallite is compared as dielectric, overcomes the drawbacks of conductive crystallite is expensive, easily damaged.
The principle of the invention is simple, cost is cheap, it is easy operation, effect it is directly perceived, completely traditional electrostatic field can be substituted to retouch Method is painted, it is significant in terms of the measurement of analog electrostatic field, teaching and research, there is certain promotional value.
The specific feature of electrostatic field scanner of the present invention is as follows:
1st, " two-dimensional scan " is realized with one-dimensional scanning and row's probe design.
Due to needing each point potential value of the point of square control network to being in certain length of side in certain area to measure, if adopted With single probe, probe must be just allowed to carry out two-dimensional scan in the region.This needs to use XY- workbench, and not only cost raises, And the control difficulty to probe location increases, the efficiency of test reduces.If the probe array being distributed using two-dimensional grid, number According to collection will increase difficulty, cost can also increase.The present invention realizes " two-dimensional scan " using one-dimensional scanning and row's probe design. 40 pins of probe are arranged in horizontal arranged at equal intervals, equivalent to one pin is laterally taking 40 positions, so, row's probe equivalent to The transversal scanning of one pin.Along with the overall one-dimensional scanning in longitudinal direction of row's probe, the two dimension equivalent to a pin is integrated Scanning.The control of the control of signal acquisition and stepper motor motion all reduces difficulty, and cost also reduced, and substantially increase number According to the efficiency of collection.
2nd, 40 tunnels or 64 road capture cards are substituted with the capture card on 2 20 tunnels.
The RS485 capture cards on the selection tunnels of Liang Ge 20, turn 232 after the output end parallel connection of the two capture cards by RS485 Bidirectional transducer is connected with host computer.Not only circuit is simple, and cost is low, and ensure that higher data acquisition efficiency.
3rd, color table registration value is utilized.
Test provides the data of 1600 test points, these data point distributions 40 rows, 40 row grid dot matrix on, Each point has the abscissa, ordinate and potential value of oneself.To obtain the equipotential lines of simulation yard, the present invention will using software Potential value divides different section, and every section with a kind of color marking, thus obtains a colored equipotential lines distribution pattern, difficulty Smaller, effect is directly perceived.
4th, data point arrangement is similar with graph paper.
Because the step angle of the stepper motor of selection is 1.8 °, the helical pitch of screw mandrel is 4mm, and therefore, stepper motor often walks one Step, row's probe move 0.02mm, pulse period 2mS in vertical direction, and therefore, choosing data collection cycle is.So, all data points will be distributed on the point of square control network that the length of side is 2.54mm, and graph paper phase Seemingly, readily appreciate and analyze.
Brief description of the drawings
The present invention is described the instantiation of the present invention in detail below in conjunction with the accompanying drawings.
The systematic schematic diagram of Fig. 1 present invention.
Row's probe scanning system structural representation of Fig. 2 present invention.
The software flow pattern of Fig. 3 present invention.
The depiction of the straight coaxial cylindrical electrostatic field equipotential lines of length of Fig. 4 embodiment of the present invention.
The depiction of two equivalent xenogenesis point electric charge electrostatic field equipotential lines of Fig. 5 embodiment of the present invention.
The depiction of the focusing electrode electrostatic field equipotential lines of Fig. 6 embodiment of the present invention.
Fig. 7 obtains growing the graphics of straight coaxial cylindrical electrostatic field potential with Origin software data processings.
Fig. 8 is obtained growing straight coaxial cylindrical electrostatic field equipotential lines distribution map with Origin software data processings.
Embodiment
Novel static electric field drawing apparatus as shown in Figure 1, mainly by row's probe scanning system 9, simulation yard to be measured(Water box)11、 First RS485 data collecting cards 2, the 2nd RS485 data collecting cards 8, host computer 3, STC89C52 single chip 4, stepper motor drive Dynamic device 6, stepper motor 7, stepper drive power supply 5,12V constant voltage dc sources 1 and simulation yard constant voltage dc source 10 are formed.The First, two data collecting cards select 20 road RS485 capture cards of vast sky electronics production, can realize the conversion of 20 road signals simultaneously.Mould Intend field constant voltage dc source both positive and negative polarity respectively with simulation yard to be measured(Water box)Two electrodes be connected, injection is appropriate in water box Clear water, establish simulation yard to be measured.Arrange 40 pins of probe successively with the first RS485 capture cards and the 2nd RS485 capture cards 40 analog input ends are connected.The COM ends of first RS485 capture cards and the COM ends of the 2nd RS485 capture cards are in parallel, so It is connected to afterwards on the binding post that water box and simulation yard are connected with constant voltage dc source negative pole.The V+ of first RS485 capture cards and The V+ parallel connections of two RS485 capture cards are followed by the positive pole of 12V constant voltage dc sources;The V- and second of first RS485 capture cards The V- parallel connections of RS485 capture cards are followed by the negative pole of 12V constant voltage dc sources.The 485G and second of first RS485 capture cards The 485G parallel connections of RS485 capture cards be followed by RS485 turn 232 bidirectional transducers GND, the 485A+ of the first RS485 capture cards with The 485A+ parallel connections of 2nd RS485 capture cards are followed by the T/R+ that RS485 turns 232 bidirectional transducers, the first RS485 capture cards The 485B- T/R-s that is followed by RS485 turns 232 bidirectional transducers in parallel with the 485B- of the 2nd RS485 capture cards.RS485 turns 232 The serial ports end of bidirectional transducer and the serial ports of host computer are connected by nine needles serial port line.
Row's probe scanning system as shown in Figure 2, by STC89C52 single chip 4, stepper motor driver 6, stepper motor 7, lead screw guide rails 18 and stepper drive power supply 5 are formed, and stepper motor 7 is connected with stepper motor driver 6, stepper motor driver 6 are connected with stepper drive power supply 5, PUL+ the and DIR+ parallel connections of stepper motor driver are followed by the P40 mouths of single-chip microcomputer, stepper motor The PUL- of driver(PUL)Meet the P8 mouths of single-chip microcomputer, the DIR- of stepper motor driver(DIR)Connect the P7 mouths of single-chip microcomputer, monolithic The P20 mouths ground connection of machine, the P18 mouths of single-chip microcomputer and an indirect 11.0592MHz for P19 mouths crystal oscillator, the P10 mouths of single-chip microcomputer and P11 mouths are connected by the USB interface of USB line and host computer;The orientation of row's probe 12 and axially vertical, the row of leading screw Probe 12 links together through crossbeam 13 and metallic rod 14, in the insertion sleeve 16 of metallic rod 14, is fastened by hold-down bolt 15, sleeve 16 are fixed on magnet base 17, and magnet base 17 is locked in lead screw guide rails 18 using magnetic force.Row's probe arranges pin and Du by 40P Nation's dress rehearsal wire is formed, and row's pin is single minute hand, and the spacing of pin is 2.54mm, and the long 30mm of pin, Du Pont's dress rehearsal wire is 40P dress rehearsal wires. The step angle of the stepper motor is 1.8 °, and the screw lead of lead screw guide rails is 4mm, pulse period 2ms, and row's probe is vertical Move 0.02mm in direction.
Fig. 3 is the software flow pattern of the present invention, electric field Survey and map software is installed in host computer, the electric field Survey and map software is by following Process flow operation:
1st, start;
The 2nd, 2 parameters of 1 parameter of communication and communication are set;1 parameter of communication is set, selected after click at serial port setting interface COM1;After setting communication 2 parameters click COM3 is selected at serial port setting interface;
3rd, scan mode is selected;
The 4th, sampling period is set;
5th, draw;
6th, preserve;
7th, terminate.
Embodiment
Utilize the novel static electric field drawing apparatus and control method of the present invention, the respectively long straight coaxial pillar electrode simulation of collection , the data of two equivalent xenogenesis point charge simulation fields and focusing electrode simulation yard, water box electrode institute making alive is followed successively by 9.9V, 6V And 6.5V.
Test result
According to above-mentioned test condition, the equipotential lines for being described simulation yard using the novel static electric field drawing apparatus of the present invention is distributed Figure.The equipotential lines distribution that upper computer software provides is respectively as shown in Fig. 4, Fig. 5 and Fig. 6.
The data Origin software processings that the novel static electric field drawing apparatus of the present invention is preserved, it can obtain three kinds of simulation yards Potential graphics and equipotential lines distribution.Wherein, the potential graphics of long straight coaxial cylindrical electrostatic field is as shown in fig. 7, equipotential lines Distribution is as shown in Figure 8.Compare and understand, equipotential lines distribution map and the Origin software processings of the simulation yard that upper computer software provides obtain To the rule of equipotential lines distribution map reflection be the same, only, the bar number of the equipotential lines that Origin softwares provide is more, bent Line is smoother.

Claims (3)

1. a kind of novel static electric field drawing apparatus, it is made up of data collecting system, row's probe scanning system, host computer three parts, electricity Field Survey and map software is arranged in host computer, the voltage signal of the data collecting system collection row probe scanning system detection, and Transmit to host computer, it is characterised in that:The data collecting system is adopted by row's probe, the first RS485 capture cards, the 2nd RS485 Truck, RS485 turn 232 bidirectional transducers, simulation yard to be measured, 12V constant voltage dc sources and simulation yard constant voltage dc source group Into;Row's probe shares 40 probes, and numbering is followed successively by 1,2,3 ... 40, wherein, 1-20 probes are adopted with the first RS485 respectively The analog input end AIN1-20 connections of truck;The 21-40 probes analog input end AIN1- with the 2nd RS485 capture cards respectively 20 connections;12V constant voltage dc sources are that the first RS485 capture cards and the 2nd RS485 capture cards are powered, the first RS485 capture cards The 485G GNDs that is followed by RS485 turns 232 bidirectional transducers in parallel with the 485G of the 2nd RS485 capture cards, the first RS485 adopts The 485A+ of truck is in parallel with the 485A+ of the 2nd RS485 capture cards to be followed by the T/R+ that RS485 turns 232 bidirectional transducers, and first The 485B- of the RS485 capture cards T/s that is followed by RS485 turns 232 bidirectional transducers in parallel with the 485B- of the 2nd RS485 capture cards R-;RS485 turns the serial ports end of 232 bidirectional transducers and the serial ports of host computer connects;Simulation yard to be measured, which is placed in, to be described on platform, is treated Two binding posts for surveying simulation yard are connected with simulation yard with the both positive and negative polarity of constant voltage dc source respectively, and simulation yard to be measured is electrolyte Analog electrostatic field;The COM of first RS485 capture cards is in parallel with the COM of the 2nd RS485 capture cards, and to be followed by simulation yard voltage stabilizing straight On the negative pole for flowing power supply;
Row's probe scanning system is by single-chip microcomputer, stepper motor driver, stepper motor, lead screw guide rails and stepper drive power supply Form, stepper motor is connected with stepper motor driver, and stepper motor driver is connected with stepper drive power supply, and stepper motor drives PUL+ the and DIR+ parallel connections of dynamic device are followed by the P40 mouths of single-chip microcomputer, and the PUL-PUL of stepper motor driver connects the P8 mouths of single-chip microcomputer, The DIR-DIR of stepper motor driver connects the P7 mouths of single-chip microcomputer, the P20 mouths ground connection of single-chip microcomputer, P18 mouths and the P19 mouths of single-chip microcomputer An indirect 11.0592MHz crystal oscillator, the P10 mouths and P11 mouths of single-chip microcomputer pass through the USB interface of USB line and host computer and connected Connect;The orientation of row's probe and leading screw it is axially vertical, row's probe links together through crossbeam and metallic rod, metallic rod In insertion sleeve, sleeve is fixed on magnet base, and magnet base is locked in lead screw guide rails using magnetic force;The electric field Survey and map software By following process flow operations:
(1)Start;
(2)2 parameters of 1 parameter of communication and communication are set;1 parameter of communication is set, COM1 is selected at serial port setting interface after click;If Put and select COM3 at serial port setting interface after 2 parameters of communication are clicked on;
(3)Select scan mode;
(4)Sampling period is set;
(5)Draw;
(6)Preserve;
(7)Terminate.
2. novel static electric field drawing apparatus according to claim 1, it is characterised in that:Row's probe arranges pin and Du by 40P Nation's dress rehearsal wire is formed, and row's pin is single minute hand, and the spacing of pin is 2.54mm, and the long 30mm of pin, Du Pont's dress rehearsal wire is 40P dress rehearsal wires.
3. novel static electric field drawing apparatus according to claim 1, it is characterised in that:The step angle of the stepper motor is 1.8 °, the screw lead of lead screw guide rails is 4mm, pulse period 2ms, and row's probe moves 0.02mm in vertical direction.
CN201410618970.8A 2014-11-06 2014-11-06 Novel static electric field drawing apparatus Expired - Fee Related CN104408997B (en)

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CN108564862B (en) * 2018-04-19 2019-12-27 南阳理工学院 Novel magnetic field plotter
CN109147509A (en) * 2018-07-17 2019-01-04 南阳理工学院 Full-automatic conductive micro-crystal electrostatic field plotter and its application method
CN109087567B (en) * 2018-09-03 2023-09-29 南阳理工学院 Electrostatic field equipotential line plotter based on two-dimensional coordinate pore plate

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