CN103823122A - Small pulsed electric field and magnetic field integrated measurement device - Google Patents
Small pulsed electric field and magnetic field integrated measurement device Download PDFInfo
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- CN103823122A CN103823122A CN201410059742.1A CN201410059742A CN103823122A CN 103823122 A CN103823122 A CN 103823122A CN 201410059742 A CN201410059742 A CN 201410059742A CN 103823122 A CN103823122 A CN 103823122A
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Abstract
The invention discloses a small pulsed electric field and magnetic field integrated measurement device. The small pulsed electric field and magnetic field integrated measurement device comprises a high-performance composite signal processing single-chip microcomputer collecting system, an electric field antenna, a high-resistance differential amplification circuit, a small loop magnetic field antenna, an integral circuit and a hexahedron metal shielding shell. Electric field signals are collected by an ADC0 module of a single-chip microcomputer. Magnetic field signals are collected by an ADC1 module of the single-chip microcomputer. All the circuits are packaged in the hexahedron metal shielding shell. An ADC0GT register and an ADC0LT register of a single-chip microcomputer chip are installed to start the window detection function of an analog-digital conversion module ADC0 to achieve pretrigger, and random overall pulse waveforms are collected by combining DMA circulating storage data. Data exchange is carried out between a collecting system and the outside through a CAN high-speed transmission interface. At the same measurement point, pulsed electric field waveforms and pulsed magnetic field waveforms can be measured at the same time in the measurement process at one time. The device is low in cost, high in work efficiency and strong in anti-jamming capability.
Description
Technical field
The present invention relates to a kind of small-sized impulse electric field magnetic field measuring device, particularly a kind of integrated digital measurement mechanism for transient pulse interference of electromagnetic field environment synchro measure impulse electric field and pulsed magnetic field.
Background technology
In a lot of environment, exist transient electromagnetic pulse to disturb, as electric switch action, the action of converting station electric power electron device, natural thunder discharge process etc. in factory.For assessing these pulse electromagnetic interference damages, need to measure them, obtain their time domain specification and frequency domain characteristic, such as halfwidth, the spectrum distribution etc. of peak value of pulse, pulse rise time, pulse.In addition, the measurement of the medium and small space of complex large system internal electromagnetic pulse is an importance of puzzlement electromagnetic pulse immunity to interference test, and main cause comprises: little space build-in test is needed the microminiaturized sensor that volume is little, disturbance is little badly; Complication system test point is many, and sensor requires cost low, is convenient to multiple spot and lays; Test macro self should have the ability that opposing environment electromagnetics disturbs.Traditional measuring method is mainly, with pulsed field sensor, impulse electric field, magnetic field are transformed into electric signal, then transfers to digital collection memory storage with cable.For avoiding the electromagnetic interference (EMI) that in electromagnetic interference environment, cable transmission is subject to, people adopt optical fiber to carry out the pulse electromagnetic field signal that transmission measurement arrives.No matter be cable transmission or optical fiber transmission signal, all inconvenient in multiple spot distributed measurement, need many number of units words acquisition and storage device, and lay in a large number cable, and acquisition and storage device must be put in electromagnetic shielding chamber or shielding cabinet and prevents that pulse electromagnetic field from disturbing it.Moreover traditional impulse electric field and pulsed magnetic field measurement sensor separate, can not accomplish that two kinds of physical quantitys, in the measurement of same point Integral synchronous, just can not obtain the relation of impulse electric field and the pulsed magnetic field of synchronization.In large-scale pulse electromagnetic environment measurement once, traditional measurement method often will expend a large amount of man power and materials.
Summary of the invention
For existing problem and shortage in traditional impulse electric field pulsed magnetic field measurement, the object of the invention is to design a kind of small-sized integrated, digitizing pulse electromagnetic field measurement device that anti-electromagnetic interference capability is strong, one-shot measurement can synchronization gain same point impulse electric field and pulsed magnetic field waveform, save transmission cable and digital recording memory device.
Object of the present invention can be achieved through the following technical solutions:
A small in-built High Performance SCM acquisition system of hexahedron micro metal shielding case, its outer 1 opposite flank fills 2 circular flat field antennas, and end face fills little ring magnetic field antenna.This on side forms differential configuration to flat field antenna, the electric field signal in this side surface direction converted to the voltage signal of difference, is input to the differential amplifier circuit of high resistant input in metal shielding by Metallic rod, offsets common mode interference.The output of differential amplifier circuit connects the input end of 16 high speed analog-to-digital conversion ADC0 of high performance mixed signal processing single chip.Little ring magnetic field antenna is made up of a circle toroidal conductor, and wire overcoat metallic shield pipe shields electric field, and metallic shield pipe middle section laterally disconnects a small gap makes inner wire produce induction to magnetic field.Magnetic field antenna is input to the integrating circuit in betal can by sub-miniature A connector, by magnetic field antenna to magnetic field induction to differentiated voltage signal carry out integration reduction.The output of integrating circuit connects the input end of 16 high speed analog-to-digital conversion ADC1 of high performance mixed signal processing single chip.
Collection, storage and the transmission of impulse electric field and pulsed magnetic field realized by high performance mixed signal processing single chip system.High performance mixed signal processing single chip system comprises built-in 16,2 tunnel high speed analog-to-digital conversion modules A DC0 and ADC1, the power circuit extending out, crystal oscillating circuit, SRAM storer, SD card, reset circuit, high-speed CAN transmit port etc.Circuits System in whole metal shielding is powered by rechargeable lithium battary.Analog-to-digital conversion module ADC0 and ADC1 be acquisition pulse electric field signal and pulsed magnetic field signal respectively, crystal oscillating circuit provides stable clock for Single Chip Microcomputer (SCM) system, the real time data that SRAM memory stores gathers, the data (non-real-time data) that the storage of SD card gathered in the past, reset circuit provides electrification reset for single-chip microcomputer, and high-speed CAN transmit port is outwards transmitted the data high-speed of system acquisition.SRAM storer is connected with it by the parallel port of high performance mixed signal processing single chip, the storage of SD card is connected with it by the SPI mouth of high performance mixed signal processing single chip, and high-speed CAN transmit port is connected with it by the CAN mouth of high performance mixed signal processing single chip.
Tested impulse electric field and pulsed magnetic field are the pulse signals of transient state, capturing complete transient pulse waveform requires acquisition system to have pre-Trigger Function, be that acquisition system can reach triggering level waveform before by collection signal, and can realize pre-Trigger Function to positive pulse and negative pulse.The method that the present invention realizes the pre-trigger data acquisition function of pulse electromagnetic field is as follows:
1, enable high performance mixed signal process chip analog-to-digital conversion module windows detecting function able to programme and respective interrupt function;
2, according to the noise level of pulse electromagnetic field and metering circuit thereof, analog-to-digital conversion module upper limit threshold register and lower threshold register are set, make upper limit threshold be slightly larger than positive noise level, lower threshold is slightly less than negative noise level;
3, enable high performance mixed signal process chip analog-to-digital conversion module direct memory access (DMA) function, and be made as circulation continuation write mode;
4, start analog to digital conversion;
5, when tested field intensity reaches the upper limit/lower threshold level, enter interrupt service routine, write down the address that current image data is deposited, the data acquisition length after triggering is set simultaneously;
6, the data length that analog-to-digital conversion module has been adopted after triggering just stops gathering, storage address during according to write down triggering and the rule of direct memory access circulation store data, the pulse electromagnetic field data that rearrangement measures, and dumped in SD card, carry out again circle collection, wait for that pulse electromagnetic field signal triggers next time.
Compared with prior art, its remarkable advantage is in the present invention:
1, pulse electromagnetic field harvester integrated level is high, and emf sensor, modulate circuit, store circuit etc. integrate, and volume is little, cost is low, easy to use.
2, integrated impulse electric field and pulsed magnetic field measurement circuit, can synchronization gain impulse electric field and two kinds of waveforms of pulsed magnetic field in same point.
3, highly integrated and digitizing, circuit package, in 6 small body metal shieldings, has improved the ability of anti-electromagnetic interference (EMI) with extraneous without any stube cable when measurement greatly, also little to tested electromagnetic disturbance.
4,2 16 high-speed AD converters of the high performance mixed signal processing single chip inside using, accuracy of data acquisition is high, and speed is fast, can reach the soonest 1Msps.
5, integrated use windows detecting function able to programme and DMA function, realizes the pre-Trigger Function of data acquisition, obtains the Full wave shape of impulse electric field and pulsed magnetic field.
6, use the DMA high-speed data memory function of high performance mixed signal process chip, the high-speed data of collection is deposited in SRAM in real time.
7, with the SPI mouth access SD card of high performance mixed signal process chip, realized the storage of mass data.
8, with CAN mouth and the extraneous swap data of high performance mixed signal process chip, compared with traditional serial ports it not only soon but also reliable, its not only economy but also practicality compared with USB mouth.
Accompanying drawing explanation
Fig. 1 is small-sized impulse electric field of the present invention magnetic field integrated measurer schematic diagram.
Fig. 2 is the equivalent circuit diagram of electric-field sensor of the present invention and differential amplification importation thereof.
Fig. 3 is the equivalent circuit diagram that magnetic field sensor of the present invention and integration thereof amplify importation; Fig. 4 is the data acquisition system (DAS) schematic diagram take C8051F060 single-chip microcomputer as core of the present invention.
embodiment
Below in conjunction with accompanying drawing, describe embodiments of the present invention in detail.
As shown in Figure 1, circular flat field antenna 1 and circular flat field antenna 3 form a pair of formation differential configuration electric-field sensor, be arranged on two opposite flanks of hexahedral metal shielding 9, electric field signal is converted to the voltage signal of difference, the differential amplifier circuit 2 that is input to the high resistant input in metal shielding 9 by Metallic rod, the output of differential amplifier circuit 2 connects the input end of 16 high speed analog-to-digital conversion ADC0 of C8051F060 single-chip microcomputer 6.
As shown in Figure 1, on hexahedral metal shielding 9 end faces, little ring magnetic field antenna 4 is housed.Little ring magnetic field antenna 4 is made up of a circle toroidal conductor, and wire overcoat metallic shield pipe shields electric field, and metallic shield pipe middle section laterally disconnects a small gap makes inner wire produce induction to magnetic field.Little ring magnetic field antenna 4 is input in betal can 9 integrating amplification circuit 5 by sub-miniature A connector, by little ring magnetic field antenna 4 to magnetic field induction to differentiated voltage signal carry out integration reduction.The output of integrating amplification circuit 5 connects the input end of 16 high speed analog-to-digital conversion ADC1 of C8051F060 single-chip microcomputer 6.
As shown in Figure 1, C8051F060 single-chip microcomputer 6 is by high-speed CAN transmit port 8 and extraneous swap data.
As shown in Figure 1, the power supply of whole measurement mechanism is powered by lithium battery 7.
As shown in Figure 2, tested electric field signal
epolarised direction is during perpendicular to flat field antenna, the electric charge of antenna induction
qfor:
In formula (1)
εthe specific inductive capacity of air, gets 8.85 × 10 approx
-12f/m,
ait is the total area of two electric field antennas.
As shown in Figure 2,
c ifor the equivalent capacity of antenna;
r efor the differential amplifier circuit equivalence input resistance in Fig. 1;
v efor electric field antenna is input to the voltage of differential amplifier circuit.When
r eit is enough large,
v ewith tested electric field
ebe directly proportional, suc as formula (2):
As shown in Figure 3,
efor the voltage of magnetic field antenna induction, with tested magnetic field
bdifferential be directly proportional, when being had during perpendicular to magnetic field antenna by measuring magnetic field
e=-
sd
b/ d
t;
smagnetic field antenna loop area;
l afor the equivalent inductance of magnetic field antenna;
r pfor the Input matching resistance of integrating amplification circuit in Fig. 15;
r cfor the integrating resistor of integrating amplification circuit in Fig. 15;
c cfor the integrating capacitor of integrating amplification circuit in Fig. 15;
r lfor the input resistance of integrating amplification circuit in Fig. 15, should be high resistant, enough large;
v lfor
ethe voltage obtaining after being integrated.The highest frequency of supposing measured pulse field signal is
ω, when meeting: R
p"
ω L a with
ωr
cc
c" 1 o'clock,
v lwith by measuring magnetic field
bbe directly proportional, suc as formula (3):
As shown in Figure 4, the collection of impulse electric field and pulsed magnetic field, storage and transmission are realized by the data acquisition system (DAS) take C8051F060 single-chip microcomputer as core.Data acquisition system (DAS) comprises that the SRAM static memory 16 of C8051F060 chip 10, reset circuit 11, LED light 12, quartz crystal oscillator circuit 14, SD storage card 15, IDT71V124SA realization, the CAN high-speed transfer that SN65HVD230 realizes drive interface 8, and 3.3V mu balanced circuit 13, whole system is all encapsulated in metal shielding 9.C8051F060 chip 10 is inner integrated 2 16 high speed analog-to-digital conversion modules A DC0 and ADC1, CAN module, and SPI module etc.The analog-to-digital conversion module ADC0 of C8051F060 chip 10 is connected with 2 in Fig. 1 and 5 respectively with ADC1, acquisition pulse electric field signal and pulsed magnetic field signal.Reset circuit 11 and C8051F060 chip 10 /RST pin is connected, for single-chip microcomputer provides electrification reset.LED light 12 is connected with the P1.6 of C8051F060 chip 10, and the 1 secondary data trigger collection condition that is used to indicate produces.Quartz crystal oscillator circuit 14 is connected with the XTAL interface of C8051F060 chip 10, and for Single Chip Microcomputer (SCM) system provides stable clock, frequency is 22.1184 MHz.SD storage card 15 is connected with the SPI mouth of C8051F060 chip 10, for store the data (non-real-time data) that gathered in the past.SRAM storer 16 is connected with P5, P6 and tri-interfaces of P7 of C8051F060 chip 10, for the real time data of storage of collected.High-speed transfer drives interface 8 to be connected with the CAN module of C8051F060 chip 10, the data high-speed of system acquisition outwards can be transmitted, more reliable again soon than traditional serial ports transmission speed, low simpler again than USB port transmission cost.Whole digital display circuit provides stable power supply by 3.3V mu balanced circuit 13.
Measured pulse electric field and pulsed magnetic field are the pulse signals of transient state, capture complete pulse waveform requirement acquisition system and there is pre-Trigger Function, be that acquisition system can reach triggering level segment waveform before by collection signal, and can trigger positive pulse and negative pulse.The analog-to-digital conversion module ADC0 of C8051F060 has windows detecting function able to programme, realizes pre-Trigger Function by ADC0GT register and ADC0LT register that C8051F060 is set.The signal that C8051F060 gathers is directly deposited datacycle in SRAM by its DMA function, in the time that the positive pulse signal gathering is greater than ADC0GT register value or negative pulse and is less than ADC0LT register value, the AD0WINT interrupt identification of C8051F060 produces, write down current data storage location by interrupt service routine, and continue the pulse waveform after trigger collection.The data of adopting before this trigger position are pre-trigger data, with the pulse waveform of the one piece of data complete of subsequent acquisition.The data length that analog-to-digital conversion module has been adopted after triggering just stops gathering, the address of depositing during according to write down triggering and the rule of direct memory access circulation store data, the pulsed field data that rearrangement measures, and dumped in SD card, and then carry out circle collection, wait for that pulsed field signal triggers next time.Realizing the pre-trigger data acquisition functional method of pulse electromagnetic field is described in detail as follows:
1, enable C8051F060 analog-to-digital conversion module windows detecting function able to programme and respective interrupt function;
2, according to the noise level of pulse electromagnetic field and metering circuit thereof, ADC0GT and ADC0LT are set, make ADC0GT be slightly larger than positive noise level, ADC0LT is slightly less than negative noise level;
3, enable C8051F060 analog-to-digital conversion module DMA function, and be made as circulation continuation write mode;
4, start analog to digital conversion;
5, when tested field intensity reaches the upper limit/lower threshold level, enter interrupt service routine, write down the address that current image data is deposited, the data acquisition length after triggering is set simultaneously;
6, the data length that analog-to-digital conversion module has been adopted after triggering just stops gathering, the address of depositing during according to write down triggering and the rule of direct memory access circulation store data, the pulse electromagnetic field data that rearrangement measures, and dumped in SD card, carry out again circle collection, wait for that pulse electromagnetic field signal triggers next time.
Because the data space that can access of C8051F060 is 64k Bytes, is also 32k Words.For the data of 16, can deposit respectively 16k impulse electric field data and 16k pulsed magnetic field data.The image data length that can arrange before triggering is 2k, after triggering, integrates data length as 14k.When C8051F060 produces in window and has no progeny according to default window trigger condition, P1.6 mouth is set to high level, makes LED light 12 bright, while continuous acquisition 14k impulse electric field data and 14k pulsed magnetic field data again, just stop gather, and by the data conversion storage in SRAM in SD storage card.When this triggering collection to data dump to completely after SD storage card, P1.6 mouth is set to low level, LED light 12 is gone out, wait for trigger action collection next time.
The above be only one of the present invention preferred embodiment.For those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle, can also make some improvement and distortion (as using other microprocessor chips instead), these improvement and distortion also should be considered as protection content of the present invention.
Claims (9)
1. a small-sized impulse electric field magnetic field integrated measurer, comprises high performance mixed signal processing single chip acquisition system, electric field antenna, high resistant differential amplifier circuit, little ring magnetic field antenna, integrating circuit and small hexahedron metal shielding; It is characterized in that, electric field antenna is connected with high resistant differential amplifier circuit, and the output of high resistant differential amplifier circuit meets the modulus acquisition module ADC0 of high performance mixed signal processing single chip acquisition system; Little ring magnetic field antenna is connected with integrating circuit, and the output of integrating circuit meets the modulus acquisition module ADC1 of high performance mixed signal processing single chip acquisition system; All circuit are all encapsulated in small hexahedron metal shielding.
2. according to claim 1, described impulse electric field magnetic field integrated measuring, is characterized in that, impulse electric field and pulsed magnetic field waveform that one-shot measurement can synchronization gain same point.
3. according to claim 1, described high performance mixed signal processing single chip acquisition system, comprise high performance mixed signal processing single chip chip, reset circuit, LED light, quartz crystal oscillator circuit, SD storage card, SRAM static memory, CAN high-speed transmission interface, it is characterized in that, high performance mixed signal processing single chip energy Real-time Collection impulse electric field field signal is to SRAM static memory, and non-real-time data is deposited in SD storage card.
4. according to claim 3, described high performance mixed signal processing single chip acquisition system, by CAN high-speed transmission interface and extraneous swap data.
5. according to claim 1, described electric field antenna, is characterized in that, 2 circular plate aerials are arranged on a pair of side of metal shielding, forms differential configuration, and is connected with the high resistant differential amplifier circuit in shielding case by Metallic rod.
6. according to claim 1, described magnetic field antenna, is characterized in that, little ring magnetic field antenna is made up of a circle toroidal conductor, wire overcoat metallic shield pipe, and metallic shield pipe middle section laterally disconnects a small gap.
7. according to claim 6, described magnetic field antenna, is characterized in that, is connected with the integrating circuit in metal shielding by sub-miniature A connector.
8. according to claim 1, described impulse electric field magnetic field integrated measuring, it is characterized in that, the windows detecting function of enabling analog-to-digital conversion module ADC0 by the upper limit threshold of high performance mixed signal processing single chip and lower threshold register are set realizes data acquisition and triggers in advance, and realizes the overall pulse waveform acquisition to random arrival in conjunction with direct memory access (DMA) circulation storage data.
9. according to Claim 8, the pre-method triggering of described data acquisition is:
(1) enable high performance mixed signal processing single chip analog-to-digital conversion module windows detecting function able to programme and respective interrupt function;
(2) according to the noise level of pulse electromagnetic field and metering circuit thereof, analog-to-digital conversion module upper limit threshold register and lower threshold register are set, make upper limit threshold be slightly larger than positive noise level, lower threshold is slightly less than negative noise level;
(3) enable high performance mixed signal processing single chip analog-to-digital conversion module DMA function, and be made as circulation continuation write mode;
(4) start analog to digital conversion;
(5) when tested field intensity reaches the upper limit/lower threshold level, enter interrupt service routine, write down the address that current image data is deposited, the data acquisition length after triggering is set simultaneously;
(6) data length that analog-to-digital conversion module has been adopted after triggering just stops gathering, the address of depositing during according to write down triggering and the rule of direct memory access circulation store data, the pulse electromagnetic field data that rearrangement measures, and dumped in SD card, and then carry out circle collection, wait for that pulse electromagnetic field signal triggers next time.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865547A (en) * | 2015-05-10 | 2015-08-26 | 中国人民解放军理工大学 | Signal injection calibration method of integral pulse magnetic field measurement system |
| CN106645987A (en) * | 2016-11-30 | 2017-05-10 | 中国电力科学研究院 | System and method for measurement of transient state ground electric field |
| CN106872795A (en) * | 2017-01-20 | 2017-06-20 | 中国电力科学研究院 | A kind of system and method for being measured to transient state space electric field |
| CN109932570A (en) * | 2019-01-23 | 2019-06-25 | 东南大学 | Shield shield effectiveness test is popped one's head in miniature electric field |
| CN110568268A (en) * | 2019-08-29 | 2019-12-13 | 赵青 | Electric field intensity test system of electric and magnetic field set based on MEMS technology |
| CN113030799A (en) * | 2021-03-07 | 2021-06-25 | 中国人民解放军陆军工程大学 | Double-ring type differential pulse magnetic field sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865547A (en) * | 2015-05-10 | 2015-08-26 | 中国人民解放军理工大学 | Signal injection calibration method of integral pulse magnetic field measurement system |
| CN106645987A (en) * | 2016-11-30 | 2017-05-10 | 中国电力科学研究院 | System and method for measurement of transient state ground electric field |
| CN106872795A (en) * | 2017-01-20 | 2017-06-20 | 中国电力科学研究院 | A kind of system and method for being measured to transient state space electric field |
| CN109932570A (en) * | 2019-01-23 | 2019-06-25 | 东南大学 | Shield shield effectiveness test is popped one's head in miniature electric field |
| CN109932570B (en) * | 2019-01-23 | 2021-03-02 | 东南大学 | Small electric field probe for testing shielding effectiveness of shielding body |
| CN110568268A (en) * | 2019-08-29 | 2019-12-13 | 赵青 | Electric field intensity test system of electric and magnetic field set based on MEMS technology |
| CN110568268B (en) * | 2019-08-29 | 2021-11-16 | 赵青 | Electric field intensity test system of electric and magnetic field set based on MEMS technology |
| CN113030799A (en) * | 2021-03-07 | 2021-06-25 | 中国人民解放军陆军工程大学 | Double-ring type differential pulse magnetic field sensor |
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