CN103885006B - There is the AC magnetic field sensor measuring frequency scanning function - Google Patents
There is the AC magnetic field sensor measuring frequency scanning function Download PDFInfo
- Publication number
- CN103885006B CN103885006B CN201410127098.7A CN201410127098A CN103885006B CN 103885006 B CN103885006 B CN 103885006B CN 201410127098 A CN201410127098 A CN 201410127098A CN 103885006 B CN103885006 B CN 103885006B
- Authority
- CN
- China
- Prior art keywords
- frequency
- signal
- converter
- magnetic field
- crystalline material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The invention provides a kind of AC magnetic field sensor having and measuring frequency scanning function, including frequency-adjustable Multi-channel signal generator (1), first converter (4), crystal filter (5), second converter (6), low pass filter (7), low-noise amplifier (8), probe, described frequency-adjustable Multi-channel signal generator (1) respectively with described probe, first converter (4), and second converter (6) be connected, described probe, described first converter (4), described crystal filter (5), described second converter (6), described low pass filter (7), described low-noise amplifier (8) is sequentially connected.The invention has the beneficial effects as follows can be with scanning survey a-c cycle magnetic field and noise and interference can be effective filtered out.
Description
Technical field
The present invention relates to weak magnetic measurement, AC magnetic field measurement apparatus technical field, particularly relate to have
Measure the AC magnetic field sensor of frequency scanning function.
Background technology
AC magnetic field sensor is widely used in the fields such as industry, measurement and medical science, in current application
There is a lot of magnetic-field measurement means and measurement technology, conventional have Hall effect, giant magnetoresistance effect,
Polytype technology such as giant magnetoresistance effect and superconductive quantum interference effect, create search coil and pass
Sensor, giant magnetoresistance sensor, giant magnetic impedance sensor, Hall element, fluxgate sensor and
The Related products such as superconducting quantum interference device (SQUID).
Use giant magnetoresistance effect sensor and fluxgate sensor, giant magnetoresistance sensor etc. other
Sensing technology is compared, and all has a clear superiority in, have relatively on machinery, mechanics, chemistry and electromagnetic performance
High sensitivity, especially has the advantage such as miniature sizes and quick response, in this technical foundation
Through being developed into substantial amounts of novel sensor based on magnetic-field measurement.
Using the magnetic field sensor that giant magnetoresistance effect makes, its main operational principle is to work as amorphous wire
During (carrying) upper applying high frequency pumping current signal, the tested magnetic field axial by amorphous wire (carrying) is believed
The impedance number making amorphous wire (carrying) two ends changes with the change of tested field signal, uses corresponding electricity
Road form is changed into other signal form this impedance variation, it is possible to achieve the measurement to magnetic field.
The principle using the complex impedance of amorphous wire (carrying) to change with tested field signal at present makes sensing
The method of device mainly has two kinds: the impedance variation of amorphous wire (carrying) is changed into the change of frequency by (1),
Will amorphous wire (carrying) as variable reactive component, be applied to oscillating circuit, its impedance variation change
For the change of frequency, by frequency signal is processed, it is achieved the detection of field signal, general in circuit
Including oscillating circuit, rectification circuit (detecting circuit) and amplifying circuit.(2) amorphous wire is directly measured
The complex impedance at (carrying) two ends, such as, uses electric bridge, amorphous wire (carrying) is applied to bridge circuit
A brachium pontis on, the output of electric bridge be one with pumping signal same frequency, the letter with fixed phase difference
Number, its amplitude-frequency characteristic has reacted the change of impedance, it is achieved the measurement of field signal, and uses vector resistance
Anti-method of testing, by amorphous wire (carrying) both end voltage, current amplitude and the measurement of phase place, real
Existing complex impedance measurement.
AC magnetic field is measured and be there is various types of noise and interference in environment, and tested AC magnetism
Field signal is the faintest, and the method used at present all can not effective filter out noise and interference.
Summary of the invention
In order to solve the problems of the prior art, the invention provides one and there is measurement frequency scanning merit
The AC magnetic field sensor of energy.
The invention provides a kind of AC magnetic field sensor having and measuring frequency scanning function, including frequency
Rate is adjustable Multi-channel signal generator, the first converter, crystal filter, the second converter, low pass
Wave filter, low-noise amplifier, probe, described frequency-adjustable Multi-channel signal generator respectively with institute
State probe, the first converter and the second converter be connected, described probe, described first converter,
Described crystal filter, described second converter, described low pass filter, described low-noise amplifier
It is sequentially connected.
As a further improvement on the present invention, described probe include non-crystalline material parts, preamplifier,
Direct current biasing coil, described non-crystalline material parts are connected with described preamplifier input, described frequency
Rate is adjustable, and Multi-channel signal generator is connected with described non-crystalline material parts, and described direct current biasing coil twines
It is around in described non-crystalline material member outer surface, described preamplifier outfan and described first converter
It is connected；
Described frequency-adjustable Multi-channel signal generator: for providing described non-crystalline material parts high respectively
Frequently stimulus frequency signal, the modulation frequency signal of the first converter, the frequency, demodulation frequency letter of the second converter
Number；
Described direct current biasing coil: be used for producing bias magnetic field；
Described non-crystalline material parts: in high frequency pumping frequency signal and the effect of DC bias magnetic field
Under, the complex impedance at described non-crystalline material parts two ends is along with by the detected AC magnetism of its axial component
The change of field signal and change, the most described non-crystalline material parts two ends produce reflects tested test cross
The ac voltage signal of stream field signal amplitude of variation；
Described preamplifier: for the ac voltage signal of non-crystalline material parts output is carried out tentatively
Amplify；
Described first converter: for the modulation that described frequency-adjustable Multi-channel signal generator is exported
Frequency signal is mixed or frequency conversion, described first frequency conversion with the ac voltage signal of non-crystalline material parts output
The signal of device output contains the signal of the mid frequency equal to described crystal filter；
Described crystal filter, its mid frequency is described non-crystalline material parts driving frequency, by test cross
Stream field signal frequency, one of frequency modulating signal combination frequency, after this crystal filter,
The output signal of remaining frequency is filtered out；
Described second converter, for believing described crystal filter output frequency signal and frequency, demodulation frequency
Number carry out being mixed or frequency conversion, containing tested in described second converter output signal after mixing or frequency conversion
AC magnetic field signal and other combination frequency signal；
Described low pass filter, in the signal of described second converter output, other combination frequency signal is remote
Higher than tested AC magnetic field signal frequency, described low pass filter is used combination frequency to be filtered；
Low-noise amplifier, is amplified described low-pass filter output signal.
As a further improvement on the present invention, described non-crystalline material parts are Co base or Fe base has huge
The amorphous alloy material of magneto-impedance effect.
As a further improvement on the present invention, described non-crystalline material parts are amorphous wire or amorphous ribbon.
As a further improvement on the present invention, described crystal filter is narrow-band crystal filter.
As a further improvement on the present invention, described narrow-band crystal filter is the arrowband crystalline substance of fixed frequency
Fluid filter.
As a further improvement on the present invention, described first converter is have frequency conversion function non-linear
Device.
Described nonlinear device includes analog multiplier, frequency mixer.
The invention has the beneficial effects as follows: the present invention has the AC magnetic field biography measuring frequency scanning function
Sensor can effective filter out noise and interference.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the present invention.
Detailed description of the invention
As it is shown in figure 1, the invention discloses a kind of AC magnetic field biography having and measuring frequency scanning function
Sensor, including frequency-adjustable Multi-channel signal generator the 1, first converter 4, crystal filter 5,
Second converter 6, low pass filter 7, low-noise amplifier 8, probe, described frequency-adjustable manifold
Road signal generator 1 is connected with described probe, the first converter 4 and the second converter 6 respectively,
Described probe, described first converter 4, described crystal filter 5, described second converter 6, institute
State low pass filter 7, described low-noise amplifier 8 is sequentially connected.
Described probe includes non-crystalline material parts 2, preamplifier 3, direct current biasing coil 9, described
Non-crystalline material parts 2 are connected with described preamplifier 3 input, and described frequency-adjustable multichannel is believed
Number generator 1 is connected with described non-crystalline material parts 2, and described direct current biasing coil 9 is wound in described
Non-crystalline material parts 2 outer surface, described preamplifier 3 outfan and described first converter 4 phase
Even；
Described frequency-adjustable Multi-channel signal generator 1: for providing described non-crystalline material parts 2 respectively
High frequency pumping frequency signal, the modulation frequency signal of the first converter 4, the demodulation of the second converter 6
Frequency signal；
Described direct current biasing coil 9: be used for producing bias magnetic field；
Described non-crystalline material parts 2: at high frequency pumping frequency signal and the work of DC bias magnetic field
Under with, the complex impedance at described non-crystalline material parts 2 two ends is along with by the tested test cross of its axial component
Flowing the change of field signal and change, the most described non-crystalline material parts 2 two ends produce reflection quilt
The ac voltage signal of detection AC magnetic field signal amplitude change；
Described preamplifier 3: for the ac voltage signal of non-crystalline material parts 2 output is carried out
Preliminary amplification；
Described first converter 4: for what described frequency-adjustable Multi-channel signal generator 1 was exported
The ac voltage signal mixing of modulation frequency signal and non-crystalline material parts 2 output or frequency conversion, described the
The signal of one converter 4 output contains the signal of the mid frequency equal to described crystal filter 5；
Described crystal filter 5, its mid frequency is described non-crystalline material parts 2 driving frequency, quilt
Test cross stream field signal frequency, one of frequency modulating signal combination frequency, through this crystal filter
After 5, the output signal of remaining frequency is filtered out；
Described second converter 6, for by described crystal filter 5 output frequency signal and JieDuHuaYu II Decoction
Rate signal carries out being mixed or frequency conversion, contains after mixing or frequency conversion in described second converter 6 output signal
There are tested AC magnetic field signal and other combination frequency signal；
Described low pass filter 7, other combination frequency letter in the signal of described second converter 6 output
Number far above tested AC magnetic field signal frequency, described low pass filter 7 is used combination frequency to be filtered；
Low-noise amplifier 8, is amplified described low pass filter 7 output signal.
Described non-crystalline material parts 2 are the amorphous alloy that Co base or Fe base have giant magnetoresistance effect
Material.
Described non-crystalline material parts 2 are amorphous wire or amorphous ribbon.
Described crystal filter 5 is narrow-band crystal filter, and described narrow-band crystal filter is fixing frequency
The narrow-band crystal filter of rate.
Described first converter 4 is the nonlinear device with frequency conversion function, described nonlinear device bag
Include analog multiplier, frequency mixer.
It is mixed or after frequency conversion through the first converter 4, in the output signal of non-crystalline material parts 2 two ends
Individual combination frequency is modulated onto on the mid frequency of narrow-band crystal filter.
When detected AC magnetic field signal frequency changes, the first converter 4 can be changed by corresponding
Modulating frequency, make the signal frequency after modulation remain at the mid frequency of narrow-band crystal filter
On, the narrow-band crystal filter of fixed frequency therefore can be used as filter part.
In the scanning process measuring frequency, system uses general, low cost and high performance solid
Determine the signal filtering that the first converter 4 is exported by the narrow-band crystal filter of frequency, there is good frequency
Rate selects performance and simple system structure.
Signal and frequency-adjustable multi channel signals that narrow-band crystal filter is exported by the second converter 6 are sent out
The demodulated signal that raw device 1 provides carries out being mixed (frequency conversion), obtain detected AC magnetic field signal and its
The combination frequency signal of its upper frequency.
When detected AC magnetic field signal frequency changes, the second converter 6 can be changed by corresponding
Frequency, demodulation frequency, make the signal frequency after demodulation comprise detected AC magnetic field signal and other higher-frequency
The combination frequency signal of rate.
The composite signal frequency of the upper frequency of the second converter 6 output is more than tested AC magnetic field signal
More than ten times of frequency.When detected AC magnetic field signal frequency changes, narrow-band crystal filter,
Low pass filter 7 etc. needs the parts of setup parameter to keep not at selected range of scanned frequencies intrinsic parameter
Become.
Non-crystalline material parts 2 have GMI effect, and non-crystalline material parts 2 are applied high frequency pumping electric current
And DC bias magnetic field, when measured signal AC magnetic field signal axial component is by non-crystalline material parts
Its complex impedance can be made when 2 to change, make the alternating current of non-crystalline material parts 2 two ends output in circuit
Pressure amplitude degree changes the most therewith, and by converter, wave filter equifrequent alternative pack, the present invention can be real
The now measurement to the tested AC magnetic field signal of variable frequency.Non-crystalline material parts 2 high-frequency excitation signal
Thered is provided by frequency-adjustable Multi-channel signal generator 1, circuit concatenates current-limiting resistance, it is ensured that provide and close
Suitable driving electric current.
For ensureing that follow-up signal processes circuit and do not affects the duty of non-crystalline material parts 2 and right
Non-crystalline material parts 2 two ends output voltage signal tentatively amplifies, non-crystalline material parts 2 two ends
Output voltage is first fed into preamplifier 3.Preamplifier 3 have the highest input impedance and
The lowest output impedance, tentatively amplifies input signal simultaneously.The difference of preamplifier 3 is defeated
Entering is amorphous material components 2 both end voltage signal, and preamplifier 3 outfan is connected to the first frequency conversion
Device 4 input.
Preamplifier 3 output voltage signal comprises tested AC magnetic field signal frequency and non-crystalline material
The combination frequency signal of parts 2 high-frequency excitation signal frequency, in order to use the arrowband of fixed frequency
Signal is filtered needing to carry out signal frequency conversion (mixing) by crystal filter, and the present invention is referred to as
For modulation, the signal frequency after modulation is equal to the mid frequency of narrow-band crystal filter.
One input signal of the first converter 4 is the output signal of preamplifier 3, and another is defeated
Entering signal is the modulated signal provided by frequency-adjustable Multi-channel signal generator 1.Signal after modulation
In comprise detected AC magnetic field signal frequency, non-crystalline material parts 2 high-frequency AC excitation signal frequency
And multiple combination frequency signals of frequency modulating signal.The frequency of modulated signal can be according to by test cross
The frequency of stream field signal adjusts so that comprise detected AC signal frequency in the signal after modulation
One combination frequency is consistently equal to the mid frequency with the narrow-band crystal filter of fixed frequency.
Narrow-band crystal filter has good frequency selective characteristic, has minimum relative bandwidth, can
Use as narrow band filter.For application scenarios such as eddy current metal defect detection, medical science lesion detection,
Tested AC magnetic field signal frequency is between several KHz to hundreds of KHz, and general frequency band, volume
The frequency range of the monolithic crystal filter that one-tenth less, low is relatively low between 1MHz to tens MHz,
In order to use general narrow-band crystal filter, need to non-crystalline material parts 2 output containing tested
The signal surveying AC magnetic field composition carries out frequency conversion (mixing).The input of narrow-band crystal filter is connected to
First converter 4 outfan, narrow-band crystal filter outfan is connected to the second converter 6 input.
The output signal of narrow-band crystal filter comprises multiple combination frequency, and the second converter 6 is to arrowband
The output signal of crystal filter carries out frequency conversion (mixing), and the present invention is referred to as demodulation, by adjusting
Whole demodulated signal frequency, makes in the signal after demodulation higher with other containing detected AC signal frequency
Composite signal frequency.Due to tested AC magnetic field signal frequency with other combination frequency signal frequency difference relatively
Greatly, available low pass filter 7 is by unwanted frequency target signal filter.One of second converter 6
Input signal is the output signal of crystal filter 5, and another input signal is by frequency-adjustable manifold
The modulated signal that road signal generator 1 provides.
The frequency of the second converter 6 output signal comprises the tested AC magnetic field signal frequency that frequency is relatively low
Rate and the higher ac-excited frequency of amorphous wire, frequency modulating signal and the group of demodulation signal frequency of frequency
Sum of fundamental frequencies rate, can use low pass filter 7 by the partial filtration of upper frequency.Low pass filter 7 defeated
Entering end and be connected to the outfan of the second converter 6, the outfan of low pass filter 7 is connected to low noise
Amplifier 8 input.
The output signal of low pass filter 7 only comprises detected AC magnetic field signal, can reach its amplification
The voltage required to detection transposition.
The operation principle of the present invention is: the probe that non-crystalline material parts 2 and biasing circuit are constituted be placed in by
In detection AC magnetic field space, frequency-adjustable Multi-channel signal generator 1 provides non-crystalline material parts 2
High-frequency AC excitation signal, provides to non-crystalline material parts 2 and drives.Apply suitable direct current biasing magnetic
, make non-crystalline material parts 2 be in higher sensitivity duty.When tested AC magnetic field signal
When axial component acts on non-crystalline material parts 2, the impedance of non-crystalline material parts 2 changes, and enters
And make the AC voltage magnitudes at non-crystalline material parts 2 two ends become with the change of external communication field signal
Change, reach to detect the purpose of AC magnetic field signal.
Enter the axial magnetic field of non-crystalline material parts 2 not only to comprise detected signal magnetic field and also deposit interference magnetic
Field and noise, be generally detected as field signal the faintest, is submerged among interference and noise, therefore
Need signal to be filtered and amplifies.In systems, detected field signal frequency is set by system
Fixed, frequency is known parameters, and the crystal filter docking collection of letters number that very bandwidth therefore can be used narrow is carried out
Wave filter, owing to the crystal filter of low operating frequency realizes relatively difficult, and volume is relatively big, therefore
System uses the crystal filter of relatively high center frequency, can use for it for cost consideration simultaneously
Narrow-band crystal filter its purposes, mass-produced, such as, for the crystalline substance of FM receiver frequency range
Fluid filter.
During in order to make the frequency of tested AC magnetic field signal change, non-crystalline material parts 2 are the most permissible
The narrow-band crystal filter using fixed frequency is filtered, and needs to use the first converter 4 to amorphous
Material components 2 output signal carries out frequency conversion, is i.e. modulated signal, by changing the first converter
The modulating frequency of 4, makes the signal frequency after modulation remain at the center frequency of narrow-band crystal filter
In rate.
After narrow-band crystal filter filters, the signal to noise ratio of detected signal is greatly improved.
Contain tested AC magnetic field signal frequency in crystal filter output signal, non-crystalline material parts 2 swash
Encourage the combination frequency of signal frequency, frequency modulating signal, one of them combination frequency optional, pass through
Tested AC magnetic field signal frequency frequency is extracted in frequency conversion (mixing), is i.e. demodulated signal.Solve
In signal after tune, the frequency of other combination frequency signal is much larger than detected AC magnetic field signal frequency,
Low pass filter 7 can be used to filter remainder.
Only comprise detected AC magnetic field signal frequency through the filtered signal of narrow band filter, utilize low
Noise amplifier 8 is amplified, and can obtain the output letter of the detected AC magnetic field signal of enough amplitudes
Number.
Frequency-adjustable Multi-channel signal generator 1 alternatively referred to as frequency-adjustable multichannel output AC signal
Generator.
Frequency-adjustable Multi-channel signal generator 1 output frequency calculates:
(1) non-crystalline material parts 2 high-frequency excitation signal frequency is famo, the modulated signal of the first converter 4
Frequency is fmod, the demodulated signal frequency of the second converter 6 is fdem, detected AC magnetic field signal frequency
Rate is fext, frequency famoDetermine according to amorphous wire material characteristic and circuit operating point.(2) amorphous material
Material parts 2 two ends output voltage signal comprises famo±fextFrequency signal.(3) first converters 4
It is f by frequencymodModulated signal and non-crystalline material parts 2 output frequency be famo±fextAC signal
Frequency conversion (is mixed), produces containing (famo±fext)±fmodThe AC signal of radio-frequency component.(4) arrowband
The mid frequency of crystal filter may be set to (famo±fext)±fmodIn one, it is assumed that select center frequency
Rate is famo+fext+fmod.Narrow-band crystal filter output frequency is by (5) second converters 6
famo+fext+fmodSignal and frequency, demodulation frequency signal fdemCarry out frequency conversion (mixing), if demodulated signal
Frequency is fdem=famo+fmod, the radio-frequency component in the second converter 6 output signal is fextAnd
fext+2famo+2fmodAs long as ensureing fdem=famo+fmodBeing obtained with frequency is fextTested exchange
Field signal.
The invention has the beneficial effects as follows:
1. use the narrow-band crystal filter that filtering performance is good that detected AC magnetic field signal is carried out
Filtering, can obtain the highest signal to noise ratio.
2. by changing modulated signal and demodulation signal frequency, it is possible to achieve to tested in whole frequency band
AC magnetic field signal performs a scan, and can obtain the frequency response of accurate field signal.
3. by the detected signal frequency modulation(PFM) of continuous variable to fixing frequency, logical on available market
, low cost, crystal filter 5 of good performance realize narrow-band filtering, improve system
Cost performance.
4. due to crystal filter 5, there is fixing frequency, put at demodulation, low-pass filtering and low noise
Big circuit can use the interlock circuit of preset parameter, reduce the design of system and the complicated journey of debugging
Degree.Frequency-adjustable Multi-channel signal generator 1 provides accurate, variable modulation and demodulation frequency,
Can ensure that and the output signal after demodulation only comprises detected AC magnetic field signal frequency.
5. detected AC magnetic field signal frequency and other combination frequency in the signal of the second converter 6 output
The frequency difference of rate signal is relatively big, and the low pass filter 7 through thereafter filters, outside tested AC magnetic field signal
Frequency significantly decayed, system obtains good signal to noise ratio.
Above content is that to combine concrete preferred implementation made for the present invention the most specifically
Bright, it is impossible to assert the present invention be embodied as be confined to these explanations.For technology belonging to the present invention
For the those of ordinary skill in field, without departing from the inventive concept of the premise, it is also possible to if making
Dry simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. one kind has the AC magnetic field sensor measuring frequency scanning function, it is characterized in that: include frequency-adjustable Multi-channel signal generator (1), first converter (4), crystal filter (5), second converter (6), low pass filter (7), low-noise amplifier (8), probe, described frequency-adjustable Multi-channel signal generator (1) respectively with described probe, first converter (4), and second converter (6) be connected, described probe, described first converter (4), described crystal filter (5), described second converter (6), described low pass filter (7), described low-noise amplifier (8) is sequentially connected；
Described probe includes non-crystalline material parts (2), preamplifier (3), direct current biasing coil (9), described non-crystalline material parts (2) are connected with described preamplifier (3) input, described frequency-adjustable Multi-channel signal generator (1) is connected with described non-crystalline material parts (2), described direct current biasing coil (9) is wound in described non-crystalline material parts (2) outer surface, and described preamplifier (3) outfan is connected with described first converter (4)；
Described frequency-adjustable Multi-channel signal generator (1): for providing described non-crystalline material parts (2) high frequency pumping frequency signal, the modulation frequency signal of the first converter (4), the frequency, demodulation frequency signal of the second converter (6) respectively；
Described direct current biasing coil (9): be used for producing bias magnetic field；
Described non-crystalline material parts (2): under the effect of high frequency pumping frequency signal and DC bias magnetic field, the complex impedance at described non-crystalline material parts (2) two ends changes along with the change by the detected AC magnetic field signal of its axial component, and the most described non-crystalline material parts (2) two ends produce the ac voltage signal of reflection detected AC magnetic field signal amplitude change；
Described preamplifier (3): the ac voltage signal for exporting non-crystalline material parts (2) tentatively amplifies；
Described first converter (4): the ac voltage signal that modulation frequency signal and the non-crystalline material parts (2) for described frequency-adjustable Multi-channel signal generator (1) being exported export is mixed or frequency conversion, contains the signal of the mid frequency equal to described crystal filter (5) in the signal that described first converter (4) exports；
Described crystal filter (5), its mid frequency be described non-crystalline material parts (2) driving frequency, tested AC magnetic field signal frequency, one of frequency modulating signal combination frequency, after this crystal filter (5), the output signal of remaining frequency is filtered out；
Described second converter (6), for carrying out being mixed or frequency conversion by described crystal filter (5) output frequency signal and frequency, demodulation frequency signal, containing tested AC magnetic field signal and other combination frequency signal in described second converter (6) output signal after mixing or frequency conversion；
Described low pass filter (7), in the signal that described second converter (6) exports, other combination frequency signal is far above tested AC magnetic field signal frequency, uses described low pass filter (7) combination frequency to be filtered；
Low-noise amplifier (8), is amplified described low pass filter (7) output signal.
AC magnetic field sensor the most according to claim 1, it is characterised in that: described non-crystalline material parts (2) are the amorphous alloy material that Co base or Fe base have giant magnetoresistance effect.
AC magnetic field sensor the most according to claim 2, it is characterised in that: described non-crystalline material parts (2) are amorphous wire or amorphous ribbon.
AC magnetic field sensor the most according to claim 1, it is characterised in that: described crystal filter (5) is narrow-band crystal filter.
AC magnetic field sensor the most according to claim 4, it is characterised in that: described narrow-band crystal filter is the narrow-band crystal filter of fixed frequency.
AC magnetic field sensor the most according to claim 1, it is characterised in that: described first converter (4) is the nonlinear device with frequency conversion function.
AC magnetic field sensor the most according to claim 6, it is characterised in that: described nonlinear device includes analog multiplier, frequency mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410127098.7A CN103885006B (en) | 2014-03-31 | 2014-03-31 | There is the AC magnetic field sensor measuring frequency scanning function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410127098.7A CN103885006B (en) | 2014-03-31 | 2014-03-31 | There is the AC magnetic field sensor measuring frequency scanning function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103885006A CN103885006A (en) | 2014-06-25 |
| CN103885006B true CN103885006B (en) | 2016-08-17 |
Family
ID=50954006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410127098.7A Active CN103885006B (en) | 2014-03-31 | 2014-03-31 | There is the AC magnetic field sensor measuring frequency scanning function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103885006B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891743B (en) * | 2014-12-19 | 2018-09-07 | 中国人民解放军军械工程学院 | A kind of motivational techniques and device of giant magnetic impedance sensor |
| CN104635185A (en) * | 2015-02-09 | 2015-05-20 | 哈尔滨工业大学深圳研究生院 | Annular alternating-current magnetic field sensor |
| CN105223524A (en) * | 2015-11-06 | 2016-01-06 | 无锡清杨机械制造有限公司 | A kind of optically pumped magnetometer |
| CN107315150B (en) * | 2017-08-16 | 2023-09-19 | 中国地质大学（北京） | Orthogonal fundamental mode fluxgate sensor |
| CN109725270A (en) * | 2019-01-22 | 2019-05-07 | 中国人民解放军国防科技大学 | GMI sensor based on detection amplification principle |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06118150A (en) * | 1992-10-06 | 1994-04-28 | Sharp Corp | Measuring device for superconducting magnetic field |
| CN2906638Y (en) * | 2005-11-02 | 2007-05-30 | 吉林大学珠海学院 | Giant magneto-impedance magnetic field sensor |
| CN100403050C (en) * | 2005-11-02 | 2008-07-16 | 吉林大学珠海学院 | Strong magnetic impedance magnetic field sensor |
| JP2009530602A (en) * | 2006-03-15 | 2009-08-27 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Sensor device using AC excitation magnetic field |
| CN101246203A (en) * | 2008-04-02 | 2008-08-20 | 吉林大学 | Amorphous alloy low-intensity magnetic field sensor |
| CN202066953U (en) * | 2011-05-30 | 2011-12-07 | 北京鼎臣超导科技有限公司 | Magnetic sensor |
| US8829901B2 (en) * | 2011-11-04 | 2014-09-09 | Honeywell International Inc. | Method of using a magnetoresistive sensor in second harmonic detection mode for sensing weak magnetic fields |
| CN203069769U (en) * | 2012-11-07 | 2013-07-17 | 杜丽娜 | Novel low-intensity magnetic field sensor |
| CN203310984U (en) * | 2013-05-03 | 2013-11-27 | 中国地震局地球物理研究所 | Bridge type resistor giant magneto-impedance effect magnetic field sensor |
-
2014
- 2014-03-31 CN CN201410127098.7A patent/CN103885006B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103885006A (en) | 2014-06-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103885000B (en) | There is the alternating current impression magnetic field sensor measuring frequency scanning function | |
| CN103885006B (en) | There is the AC magnetic field sensor measuring frequency scanning function | |
| CN110824229B (en) | Single-magnetic-core multi-winding magnetic balance type current detection device | |
| CN110927428B (en) | Wide-range wide-band high-precision magnetic balance type current measuring device | |
| CN105745547B (en) | Current-flow test set and current measuring method | |
| CN113341211A (en) | Fluxgate current sensor and measuring method thereof | |
| CN103885001B (en) | Serial array formula AC magnetic field sensing device | |
| CN103885007B (en) | Side-by-side array formula AC magnetic field sensing device | |
| Tu et al. | Measurement of Brownian relaxation of magnetic nanoparticle by a multi-tone mixing-frequency method | |
| CN107941660A (en) | The error extracting method and device of a kind of magnetic particle detection system | |
| Bai et al. | Dual-channel Metal Debris Signal Differential Detection Based on Frequency Division Multiplexing | |
| CN117054733A (en) | Probe and single-probe double-range fluxgate current sensor | |
| CN116893374A (en) | High-sensitivity magnetic nanoparticle spectrometer and waveform signal conversion method thereof | |
| CN102520375B (en) | Fluxgate magnetometer detection circuit and method for improving accuracy thereof | |
| CN201754160U (en) | Magnetic-sensing probe of amorphous glass coated wire and current measurement device comprising the probe | |
| CN106597332A (en) | Electron paramagnetic resonance spectrometer | |
| CN105333986A (en) | Single-stage coil cable tension sensor based on self-inductance principle and test method thereof | |
| CN105806390A (en) | Magnetoelastic sensor detection system | |
| CN110441717A (en) | The measurement method and system of giant magnetostrictive transducer dynamic electromagnetic consumable | |
| PL224915B1 (en) | Method for measuring electron relaxation times T ₁ in the EPR tomography and system for localization of neoplastic changes using the EPRI imaging | |
| Clifford et al. | A retrofit 60 Hz current sensor for non-intrusive power monitoring at the circuit breaker | |
| CN204142915U (en) | For the device of testing circuit phase-frequency characteristic | |
| He et al. | High sensitive magnetic sensor with amorphous wire | |
| GB2252835A (en) | Measuring hysteresis characteristics | |
| SU1099293A1 (en) | Device for measuring dynamic reversible magnetic permeability |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |