CN2410653Y - Active magnetic field sensor - Google Patents
Active magnetic field sensor Download PDFInfo
- Publication number
- CN2410653Y CN2410653Y CN 00226041 CN00226041U CN2410653Y CN 2410653 Y CN2410653 Y CN 2410653Y CN 00226041 CN00226041 CN 00226041 CN 00226041 U CN00226041 U CN 00226041U CN 2410653 Y CN2410653 Y CN 2410653Y
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- China
- Prior art keywords
- becket
- circuit
- amplifier
- model
- utility
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Abstract
The utility model relates to a measuring element which is mainly used for solving the defects of poor transient response ability, limited gain, and incapable weak radiation field measurement of electromagnetic radiation measuring elements. The utility model has the key technical proposal that a probe is improved, a structure that an opening ferrule 2 is sheathed on an entire magnetic core 1, and a measured current-carrying conducting wire 4 is penetrated through the ferrule 2 is adopted, and a low noise amplifying circuit which is connected with a detector is provided with three different wavebands. The utility model has the advantages of simple structure, wide frequency band, and high gain, and the utility model can be used as an active magnetic field sensor which is used for measuring various electromagnetic radiation.
Description
The utility model relates to measuring element, a kind of specifically active magnetic field sensor that amount of electromagnetic radiation is measured.
As everyone knows, the electromagnetic radiation of electronic product is the key factor that produces environmental pollution and be detrimental to health, and the transmission line of electronic system when transmitting data owing to the leakage that radiation caused, also can have influence on the performance of product and the reliability of system.Traditional static magnetic field measurement is to utilize Hall unit as magnetic field sensor, utilizes Hall effect that magnetic field intensity is converted to voltage signal, and its defective is that it can not be measured transient changing magnetic field.Tradition is to use the mutual inductance principle to adopt current clamp that the exchange current in the lead is measured to the kinetic measurement of transmission line, this survey instrument is owing to adopt movable hatch frame, and magnetic core is made up of asymmetrical two parts, a needs riveted joint, the other end opening embeds measurand.Thereby have the deficiency of three aspects, and the one, purposes is single, the transient response ability, the 2nd, the slit magnetic resistance change rate is big, and gain is restricted, and the 3rd, can not measure weak current and faint radiation field.
The purpose of this utility model is that the conventional current wrench structure is improved, and a kind of active magnetic field sensor is provided.
Realize that the utility model purpose technical scheme is to adopt to survey body as probe, forms active magnetic field sensor with the broadband low noise amplifier.This detection body is based on the principle of current transformer and magnetic dipole antenna, its structure is that magnetic core adopts one-piece construction, and cover is equipped with the becket of hatch frame in the magnetic core, and tested current carrying conductor passes from becket, utilize the intrinsic elasticity of metal, make becket form the closed-loop path naturally.The signal extension line that connects on the magnetic core 1 is provided with three contacts, is connected with the amplifying circuit input adapter of three different-wavebands respectively.When transmission line is measured, use the mutual inductance principle, make the little ring of metal place in the becket current carrying conductor grade coupled with magnetic ring coil two through opening.When the measuring radiation field, the becket that can select different size for use is as receiving antenna.This amplifier mainly is made up of three low noise amplifying circuits of different bandwidth and impedance transformer network.Each circuit gain changes in the 3dB scope, and each Frequency point is realized smooth connection, and it is identical to gain in whole design bandwidth scope, makes amplifier form an organic whole.The circuit structure form that each frequency range adopts is identical, all be the signal of surveying the body collection to be amplified respectively and pre-service by balancing circuitry, the signal that amplifies output forms a single-ended output signal over the ground by the differential type input again, differential output signal is connected with impedance inverter circuit by second level amplifying circuit, with raising Amplifier Gain and bandwidth, and the input impedance matching of assurance and equipment such as oscillograph and frequency spectrograph.
The becket of above-mentioned detection body adopts bare copper wire or silver-coated copper wire to process.Adopt the opening overlap joint for becket, and opening part is carried out Alloying Treatment and Quenching Treatment as conduction measurement.Make it enough elasticity be arranged with after guaranteeing to embed tested insulated conductor, two joints can contact closely, make contact resistance enough little.Be used for radiometric becket and be welded into integral body.
The utility model adopts one-piece construction owing to survey the magnetic core of body, the becket of socket hatch frame in the magnetic core, thereby simple in structure, easily processing, and have current clamp and two kinds of functions of magnetic dipole antenna concurrently; Because amplifying circuit adopts three groups of same circuits forms of three different-wavebands, so frequency band range is wide, in the whole frequency band scope, gain is high simultaneously, and actual measurement shows that operating frequency range of the present utility model is 1K-100M, gains to be that 65dB, sensitivity are 2.5 * 10
-4A/m, output impedance is 50 Ω.
Describe structure of the present utility model in detail below in conjunction with accompanying drawing.
Fig. 1 is a block scheme of the present utility model
Fig. 2 is detection body structure figure of the present utility model
Fig. 3 is the first wave band amplifying circuit schematic diagram of the present utility model
Sensor construction shown in Figure 1 is mainly formed by surveying body and amplifying circuit.The signal extension line of wherein surveying body is provided with three contacts, respectively with 1K-2MHZ, and 1.8M-12MHZ, the amplifying circuit of three different-wavebands of 10M-100MHZ is connected.
Among Fig. 2, the 1st, socket becket 2 in one-piece construction shape magnetic core and the coil, magnetic core, becket 2 is provided with opening part 3, and tested current carrying conductor 4 passes from becket 2, and the outside of magnetic core 1 is provided with signal extension line 5.
The first band circuit schematic diagram shown in Figure 3 is the amplifying circuit of 1K-2MHZ frequency range, and this circuit comprises balancing circuitry, differential input circuit, amplifying circuit and impedance matching circuit, and wherein balancing circuitry is by integrated package A
1, A
2With its peripheral resistance R separately
1, R
2, R
3With peripheral capacitor C
1Form, differential input circuit is by integrated circuit A
3With peripheral resistance R
4, R
5, R
6, R
7Form, amplifying circuit is by integrated circuit A
4With peripheral resistance R
8, R
9, R
10Form, impedance matching circuit is by integrated package A
5With input resistance R
11Form.The signal extension line of surveying body is connected with the input adapter G of amplifying circuit, through two-way electronic switch U
1And U
2Respectively with balancing circuitry A
1And A
2Be connected, the signal of surveying the body collection is amplified respectively and pre-service.The output of two-way balancing circuitry enters the negative terminal and the anode of differential circuit respectively, to suppress common mode interference effectively.Form a single-ended output signal over the ground, this output signal is passed through resistance R
8With amplifying circuit A
4Be connected, to increase Amplifier Gain and bandwidth, amplifying circuit A
4Output pass through resistance R
11With impedance inverter circuit A
5Be connected, the output impedance of 50 Ω arranged to guarantee entire circuit.The output terminal P of impedance inverter circuit can require respectively input impedance matching with distinct devices such as oscillograph and frequency spectrographs according to actual measurement.
The 1.8M-12MHZ of this amplifier and 10M-100MHZ two wave band amplification circuit structure figure are identical with the circuit structure of 1K-2MHZ wave band shown in Figure 3, just capacitance-resistance numerical value difference.Operational amplifier model in three groups of amplifying circuits of different-waveband is identical, and adopts A respectively
1, A
2Be MAX4162, A
3Be MAX4199, A
4, A
5Be MAX4329.
In order to overcome the noise of broadband low noise amplifier circuit itself, except selecting the low noise element for use, shorten interelement line as far as possible.When making, 1K-2MHZ, 1.8M-12MHZ the circuit component of two wave bands is installed in the one side of printed circuit board (PCB), and the circuit component of 10M-100MHZ wave band is installed in the another side of printed circuit board (PCB), disturb other circuit for preventing radiation, whole elements of high frequency band are shielded with metal shell.
Claims (3)
1. an active magnetic field sensor is mainly formed by surveying body and amplifier, it is characterized in that:
A. the magnetic core (1) of surveying body adopts one-piece construction, the interior socket becket of magnetic core (1) (2), becket (2) is provided with opening part (3), tested current carrying conductor (4) passes from becket (2), magnetic core (1) is gone up the signal extension line that connects and is provided with three contacts, is connected with the low noise amplifier circuit input adapter G of three wave bands respectively;
B. amplifier is made as 1K-2MHZ, 1.8M-12MHZ, the low noise amplifier circuit of three groups of same structures of three audio range frequencies of 10M-100MHZ, each group amplifying circuit comprises balancing circuitry, differential input circuit, amplifying circuit and impedance matching circuit, wherein two-way balancing circuitry A
1, A
2Input end respectively by electronic switch U
1, U
2G is connected output terminal and difference channel A with the input contact
3Input end be connected, to form single-ended output signal over the ground, this differential output signal is again by amplifier A
4With impedance inverter circuit A
5Be connected.
2. sensor according to claim 1, it is characterized in that the becket of surveying body adopts naked copper money or silver-coated copper wire, adopt the opening bridging arrangement for becket (2) as conduction measurement, it is grade coupled with magnetic ring coil two that tested current carrying conductor is placed in the becket, for adopting the welding integral structure as radiometric becket (2).
3. sensor according to claim 1 is characterized in that 1K-2MHZ, and the amplifier element of the amplifier element of 1.8M-12MHZ wave band and 10M-100MHZ wave band is installed in respectively on two faces of printed circuit board (PCB), to avoid the noise of circuit itself.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00226041 CN2410653Y (en) | 2000-01-19 | 2000-01-19 | Active magnetic field sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00226041 CN2410653Y (en) | 2000-01-19 | 2000-01-19 | Active magnetic field sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2410653Y true CN2410653Y (en) | 2000-12-13 |
Family
ID=33589986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00226041 Expired - Fee Related CN2410653Y (en) | 2000-01-19 | 2000-01-19 | Active magnetic field sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2410653Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777151A (en) * | 2014-02-11 | 2014-05-07 | 中国科学院电子学研究所 | Magnetic field sensor |
| CN116380163A (en) * | 2023-03-29 | 2023-07-04 | 青岛峻海物联科技有限公司 | Sensing device for intelligent environment data acquisition of Internet of things |
-
2000
- 2000-01-19 CN CN 00226041 patent/CN2410653Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777151A (en) * | 2014-02-11 | 2014-05-07 | 中国科学院电子学研究所 | Magnetic field sensor |
| CN103777151B (en) * | 2014-02-11 | 2016-03-23 | 中国科学院电子学研究所 | Magnetic field sensor |
| CN116380163A (en) * | 2023-03-29 | 2023-07-04 | 青岛峻海物联科技有限公司 | Sensing device for intelligent environment data acquisition of Internet of things |
| CN116380163B (en) * | 2023-03-29 | 2024-01-19 | 青岛峻海物联科技有限公司 | Sensing device for intelligent environment data acquisition of Internet of things |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |