CN1570661A - Method for measuring micro magnetic field and high sensor thereof - Google Patents
Method for measuring micro magnetic field and high sensor thereof Download PDFInfo
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- CN1570661A CN1570661A CN 03135434 CN03135434A CN1570661A CN 1570661 A CN1570661 A CN 1570661A CN 03135434 CN03135434 CN 03135434 CN 03135434 A CN03135434 A CN 03135434A CN 1570661 A CN1570661 A CN 1570661A
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Abstract
A method for measuring micro magnetic field which is to concatenate coil of conductive wires with high-frequency vibration return circuit to serves as electric inductance changing with magnetic field through it to vary output frequency of high-frequency vibration return circuit. A sensor with high accuracy for measuring micro magnetic field is concatenated with concatenate in high-frequency vibration return circuit and the coil is used as electric inductance probe of micro magnetic field. The output of high-frequency vibration return circuit is transmitted into display device through signal circuit collecting and processing circuit. This invention can be used to simultaneously detect dynamic and static micro magnetic field.
Description
Technical field the present invention relates to the little magnetic field of a kind of measurement, and (magnetic flux density B is less than 10 usually
-6Gauss's (Gauss) magnetic field is called little magnetic field) method and the high sensitive sensor that adopts the method to make, belong to the electromagnetics technical field.
Background technology magnetic field is ubiquitous in actual life, and general magnetic induction (Magnetoinductive) magnetometer or induction (Inductive) magnetometer detect less than little magnetic field.The sensor that can detect little magnetic field in the prior art mainly contains: search coil (Searching coil), optical pumping spectrum magnetometer, optical fiber magnetometer, fluxgate type magnetometer, nuclear magnetic resonance magnetometer, superconductive quantum interference equipment.Search coil can't detect static state or change slower magnetic field, and all there is defective such as cost an arm and a leg, equipment is huge, operation is dumb in other sensor.Chinese patent 02111733.0 " measuring method of weak micromagnetic field " places electron microscope to take electron hologram testing sample, on optics Mach-battle array Te Er interferometer, carry out phasic difference and amplify, just can obtain the magnetic flux of testing sample by the number of interference fringes that reads interferogram.Very inconvenience of this method operation also needs special instrument and equipment.
Summary of the invention is at the deficiency that above-mentioned prior art exists, and the purpose of this invention is to provide the method in a kind of low price, the little magnetic field of measurement easy to use, and highly sensitive, the small size sensor made with the method.
The object of the present invention is achieved like this: a kind of method of measuring little magnetic field, and series connection is twined the coil make as little magnetic field inductance probe by conductor wire in the loop of high-frequency oscillating circuits, and makes high-frequency oscillating circuits produce more stable frequency output; When passing through the changes of magnetic field of inductance, inductance also changes thereupon, and the output frequency of high-frequency oscillating circuits is changed; The output of high-frequency oscillating circuits connects frequency sampling and treatment circuit, and shows little magnetic field by display device.
Described coil also can around the magnetic flux rate can magnetic core with changes of magnetic field on.
Measure the high sensitive sensor in little magnetic field, series coil in the loop in high-frequency oscillating circuits, coil is as little magnetic field inductance probe; The output of high-frequency oscillating circuits is passed through to connect frequency sampling and treatment circuit, and shows little magnetic field by display device.
Its ultimate principle is that the output frequency and the inductance of common L/R or L/C oscillator has following relation:
Wherein, ω is an output frequency, and L is an inductance, and C is an electric capacity.
If the variable quantity of external magnetic field is very faint, following formula to the L differential, is obtained the relational expression between inductance microvariations and the microvariations of circuit output frequency:
Be not difficult to find out that the microvariations amount by the following formula inductance is directly proportional with the microvariations amount of output frequency, then the microvariations amount in magnetic field also can with the microvariations amount proportion relation of output frequency.And improving the frequency of operation of system and reduce inductance can both increase the frequency change that the magnetic field microvariations causes and improve transducer sensitivity.The best approach that improves transducer sensitivity is the frequency of operation of raising system.Improve constantly frequency of operation in theory sensitivity can reach infinitely great.Form according to this thinking modification circuit is in about 15MHz the frequency of operation of Magnetic Sensor, reaches the purpose that improves transducer sensitivity.
Adopt the present invention, have following advantage:
1. can detect dynamic and static micro magnetic field simultaneously.
2. highly sensitive, in the existing magnetic field sensor, have only superconductive quantum interference equipment suitable with it.
3. low price.
4. volume is little, easy to use.
The invention will be further described below in conjunction with accompanying drawing for description of drawings:
Fig. 1 is a principle of the invention block scheme.
Fig. 2 is sensor one embodiment circuit theory diagrams of the present invention.
As little magnetic field inductance probe, the inductance of inductance probe changes the output frequency of high-frequency oscillating circuits with changes of magnetic field in the high-frequency oscillating circuits oscillation circuit for a kind of method of measuring little magnetic field of embodiment, the coil tandem that conductor wire is wound in; Output frequency is dynamic and static micro magnetic field by high frequency sampling hold circuit, interface circuit, CPU and display process electric circuit inspection.
As shown in Figure 1, be the complete block diagram of a detection system structure, present Soc (System on chip) technology can be integrated the entire circuit system on chip piece, and such design process can most ofly be researched and developed voluntarily by software programming and finishes.Therefore, detection system can accomplish that remainder is fully-integrated except that display, reduces greatly and makes and design cost.
As shown in Figure 2, be the high sensitive sensor one concrete circuit of implementing of measuring little magnetic field, the coil L that the series connection conductor wire is wound in the loop in high-frequency oscillating circuits, coil L is as little magnetic field inductance probe; The output of high-frequency oscillating circuits is by signal acquisition circuit, and treatment circuit is sent into display device.
The core of magnetic field sensor is a high frequency oscillation generator.Two phase inverter I
1, I
2Add capacitor C with an inductance L feedback as probe
2And corresponding resistor R
1, R
2Constitute a complete oscillation circuit.Two phase inverter I
1, I
2Constitute the active part of oscillatory circuit; Resistance R
1, R
2Mainly playing the biasing phase inverter makes it to be in the oscillatory work district; An inductance L and a capacitor C
2Constituted the backfeed loop of oscillatory circuit; A capacitor C
1Isolate two phase inverters, make not produce DC current between the two.Suitably adjust resistance R
1, R
2Parameter makes phase inverter I
1, I
2Be in the workspace, suitably adjust inductance L and capacitor C again
2Parameter just can make circuit produce a stable vibration output.
When pop one's head in by inductance L in magnetic field, inductance changes, thereby causes frequency change.Adopt the variation of sample circuit recording frequency signal, send into central processing unit by interface circuit data are handled, the signal after handling is sent into display device by the display process circuit again, just can with the naked eye observe directly the variation in magnetic field.
The present invention also can with coil around the magnetic flux rate can with on the magnetic core of changes of magnetic field as the inductance probe of high-frequency oscillating circuits, when changes of magnetic field, inductance also changes thereupon, impel the output frequency of oscillatory circuit to change, so the proportionate relationship that the variation of the output frequency of oscillatory circuit will be certain with being varied to of magnetic field.
At present can detect 7.05 * 10 with the sensor of oscillation frequency about 15MHz is minimum
-10Gauss's (Gauss) magnetic field.
Claims (6)
1. method of measuring little magnetic field is characterized in that in the loop of high-frequency oscillating circuits series coil as little magnetic field inductance probe, and makes high-frequency oscillating circuits produce more stable frequency output; When passing through the changes of magnetic field of inductance, inductance also changes thereupon, and the output frequency of high-frequency oscillating circuits is changed; The output of high-frequency oscillating circuits connects frequency sampling circuit and treatment circuit, and shows little magnetic field by display device.
2, the method in the little magnetic field of measurement according to claim 1 is characterized in that described coil is twined by conductor wire to make.
3, the method in the little magnetic field of measurement according to claim 1, it is characterized in that described coil around the magnetic flux rate can magnetic core with changes of magnetic field on.
4, measure the high sensitive sensor in little magnetic field, it is characterized in that series coil in the loop in high-frequency oscillating circuits, coil is as little magnetic field inductance probe; The output of high-frequency oscillating circuits is passed through to connect frequency sampling and treatment circuit, and shows by display device.
5, the method in the little magnetic field of measurement according to claim 4 is characterized in that described coil is twined by conductor wire to make.
6, the method in the little magnetic field of measurement according to claim 4, it is characterized in that described coil around the magnetic flux rate can magnetic core with changes of magnetic field on.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03135434 CN1570661A (en) | 2003-07-16 | 2003-07-16 | Method for measuring micro magnetic field and high sensor thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03135434 CN1570661A (en) | 2003-07-16 | 2003-07-16 | Method for measuring micro magnetic field and high sensor thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101218442B (en) * | 2005-07-07 | 2010-09-29 | Zf腓特烈港股份公司 | Joint for a vehicle |
| CN102636701A (en) * | 2012-04-17 | 2012-08-15 | 深南电路有限公司 | Inductor detecting instrument and method |
| CN104969085A (en) * | 2012-07-13 | 2015-10-07 | 蒙彼利埃大学 | Micromagnetometry detection system and method for detecting magnetic signatures of magnetic materials. |
| CN106996780A (en) * | 2017-04-24 | 2017-08-01 | 湖南格纳微信息科技有限公司 | A kind of course error modification method and device and magnetic field detection method and device |
| CN107305241A (en) * | 2017-06-26 | 2017-10-31 | 美新微纳传感系统有限公司 | A kind of magnetic sensing device and its real-time self checking method |
| CN112394305A (en) * | 2020-10-23 | 2021-02-23 | 联钢精密科技(中国)有限公司 | Magnetic flux rate detection equipment |
-
2003
- 2003-07-16 CN CN 03135434 patent/CN1570661A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101218442B (en) * | 2005-07-07 | 2010-09-29 | Zf腓特烈港股份公司 | Joint for a vehicle |
| CN102636701A (en) * | 2012-04-17 | 2012-08-15 | 深南电路有限公司 | Inductor detecting instrument and method |
| CN104969085A (en) * | 2012-07-13 | 2015-10-07 | 蒙彼利埃大学 | Micromagnetometry detection system and method for detecting magnetic signatures of magnetic materials. |
| CN104969085B (en) * | 2012-07-13 | 2018-03-02 | 蒙彼利埃大学 | For micro- the magnetometry detecting system and method for the magnetic characteristic for detecting magnetic material |
| CN106996780A (en) * | 2017-04-24 | 2017-08-01 | 湖南格纳微信息科技有限公司 | A kind of course error modification method and device and magnetic field detection method and device |
| CN106996780B (en) * | 2017-04-24 | 2020-05-05 | 湖南格纳微信息科技有限公司 | Course error correction method and device and magnetic field detection method and device |
| CN107305241A (en) * | 2017-06-26 | 2017-10-31 | 美新微纳传感系统有限公司 | A kind of magnetic sensing device and its real-time self checking method |
| CN112394305A (en) * | 2020-10-23 | 2021-02-23 | 联钢精密科技(中国)有限公司 | Magnetic flux rate detection equipment |
| CN112394305B (en) * | 2020-10-23 | 2022-12-20 | 联钢精密科技(中国)有限公司 | Magnetic flux rate detection equipment |
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