CN103885007B - Side-by-side array formula AC magnetic field sensing device - Google Patents
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Abstract
The invention provides a kind of side-by-side array formula AC magnetic field sensing device, including frequency-adjustable Multi-channel signal generator (1), multiple probe (10), multiple sensing circuit subsystem (11), described probe (10) is identical with described sensing circuit subsystem (11) quantity, and described probe (10) is that one_to_one corresponding is connected with described sensing circuit subsystem (11), described frequency-adjustable Multi-channel signal generator (1) is connected with multiple probes (10) and multiple sensing circuit subsystem (11) respectively.The invention has the beneficial effects as follows that the side-by-side array formula AC magnetic field sensing device of the present invention can accurately detect the communication space magnetic field of parallel distributed.
Description
Technical field
The present invention relates to weak magnetic measurement, AC magnetic field measurement apparatus technical field, particularly relate to side by side
Array AC magnetic field sensing device.
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.
Current AC magnetic field sensing device spatial resolution is the highest, it is impossible to accurately detection space magnetic field divides
Cloth.
Summary of the invention
In order to solve the problems of the prior art, the invention provides a kind of side-by-side array formula AC magnetic field
Sensing device.
The invention provides a kind of side-by-side array formula AC magnetic field sensing device, including frequency-adjustable manifold
Road signal generator, multiple probe, multiple sensing circuit subsystem, described probe and described sensing electricity
Subsystems quantity is identical, and described probe is that one_to_one corresponding is connected with described sensing circuit subsystem,
Described frequency-adjustable Multi-channel signal generator respectively with multiple probes and multiple sensing circuit subsystem phase
Even.
As a further improvement on the present invention, what described sensing circuit subsystem included being sequentially connected is preposition
Amplifier, the first converter, crystal filter, the second converter, band filter, low noise are put
Big device, described frequency-adjustable Multi-channel signal generator the first converter and the second converter respectively
Being connected, described probe is connected with described preamplifier.
As a further improvement on the present invention, described probe include non-crystalline material parts, isolated amplifier,
Resistance, described resistance one end is connected with described isolated amplifier outfan, the described resistance other end and institute
State non-crystalline material parts to be connected, described frequency-adjustable Multi-channel signal generator and described isolated amplifier
Input is connected, and described non-crystalline material parts are connected with described preamplifier.
As a further improvement on the present invention,
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 non-crystalline material parts: be used under the effect of high frequency pumping frequency signal, described amorphous material
The complex impedance at material parts two ends is along with the change by the detected AC magnetic field signal of its axial component
Change, the most described non-crystalline material parts two ends produce the detected AC magnetic field signal amplitude of reflection
The ac voltage signal of change；The transducing signal of diverse location gives by non-crystalline material parts axial
, along the AC magnetic field spatial distribution in its orientation；
Described preamplifier: for the ac voltage signal of non-crystalline material parts output is carried out tentatively
Amplify and impedance transformation；
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 combination 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 band filter, in the signal of described second converter output, other combination frequency signal is remote
Higher than tested AC magnetic field signal frequency, described band filter is used combination frequency to be filtered；
Low-noise amplifier, is amplified described band 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；Described non-crystalline material parts (2) equidistantly parallel arranged.
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 side-by-side array formula AC magnetic field sensing device structure letter of the present invention
Singly, the communication space magnetic field of parallel distributed can be accurately detected.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the present invention.
Fig. 2 is the sensing circuit subsystem theory diagram of the present invention.
Fig. 3 is the probe theory diagram of the present invention.
Detailed description of the invention
As it is shown in figure 1, the invention discloses a kind of side-by-side array formula AC magnetic field sensing device, including
Frequency-adjustable Multi-channel signal generator 1, multiple probe 10, multiple sensing circuit subsystem 11, institute
State probe 10 identical with described sensing circuit subsystem 11 quantity, and described probe 10 and described sensing
Circuit subsystem 11 for one_to_one corresponding be connected, described frequency-adjustable Multi-channel signal generator 1 respectively with
Multiple probes 10 are connected with multiple sensing circuit subsystems 11.
As in figure 2 it is shown, described sensing circuit subsystem 11 include being sequentially connected preamplifier 3,
First converter 4, crystal filter the 5, second converter 6, band filter 7, low noise amplification
Device 8, first converter 4 and the second frequency conversion respectively of described frequency-adjustable Multi-channel signal generator 1
Device 6 is connected, and described probe 10 is connected with described preamplifier 3.
As it is shown on figure 3, described probe 10 includes non-crystalline material parts 2, isolated amplifier 12, resistance
13, described resistance 13 one end is connected with described isolated amplifier 12 outfan, described resistance 13 another
End is connected with described non-crystalline material parts 2, and described frequency-adjustable Multi-channel signal generator 1 is with described
Isolated amplifier 12 input is connected, and described non-crystalline material parts 2 are connected with described preamplifier 3.
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 non-crystalline material parts 2: be used under the effect of high frequency pumping frequency signal, described amorphous
The complex impedance at material components 2 two ends is along with the change by the detected AC magnetic field signal of its axial component
Changing and change, the most described non-crystalline material parts 2 two ends produce reflection detected AC magnetic field letter
The ac voltage signal of number amplitude of variation；The transducing signal of diverse location gives by non-crystalline material portion
Part axial, along the AC magnetic field spatial distribution in its orientation；
Described preamplifier 3: for the ac voltage signal of non-crystalline material parts 2 output is carried out
Preliminary amplification and impedance transformation；
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 combination 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 band 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 band filter 7 is used combination frequency to be filtered；
Low-noise amplifier 8, is amplified described band 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；The described equidistant parallel arranged of non-crystalline material parts 2.
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,
Band 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.
Independent isolated amplifier 12 is used to isolate amorphous wire (carrying) high-frequency excitation signal, it is ensured that to make
With amorphous wire (carrying) the two ends output voltage on each passage in the case of same high-frequency excitation signal
It does not interfere with each other；
Multiple equidistant parallel arranged of non-crystalline material parts 2, can sense the friendship axial by amorphous wire
Stream field signal, the transducing signal of diverse location gives, edge axial by non-crystalline material parts 2
The AC magnetic field spatial distribution in its orientation.
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 band 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 band filter 7 by the partial filtration of upper frequency.Band filter 7 defeated
Entering end and be connected to the outfan of the second converter 6, the outfan of band filter 7 is connected to low noise
Amplifier 8 input.
The output signal of band 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: organize amorphous wire (carrying) equidistantly parallel arranged more, formed straight line,
Drainage pattern along the axial communication space field signal of amorphous wire (carrying).
Amorphous wire (carrying) is provided amorphous wire (carrying) by frequency-adjustable multichannel output AC signal generator
High-frequency AC excitation signal, provides to amorphous wire (carrying) and drives.When tested AC magnetic field letter in space
Number axial component when acting on corresponding amorphous wire (carrying), the impedance of amorphous wire (carrying) is with space
Change of magnetic field strength, the AC voltage magnitudes at amorphous wire (carrying) two ends changes the most therewith, detects each
Amorphous wire (carrying) corresponding frequencies AC signal can realize the detection of space exchanging 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,
Band 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 band filter 7 through thereafter filters, outside tested AC magnetic field signal
Frequency significantly decayed, system obtains good signal to noise ratio.
6. amorphous wire (carrying) has the least physical dimension and the strongest magnetic direction selectivity,
The sensor utilizing this characteristic to make can realize the highest space magnetic field detection resolution.
7. under suitable amorphous wire (carrying) arrangement pitches, side-by-side array formula AC magnetic field sensing device
Can realize in the plane that is axially made up of amorphous wire (carrying) orientation and amorphous wire (carrying), edge
The measurement of the set of the upper AC magnetic field of amorphous wire (carrying), these are measured signal and reflect AC magnetism
The spatial distribution state of field.
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 (9)
1. a side-by-side array formula AC magnetic field sensing device, it is characterized in that: include frequency-adjustable Multi-channel signal generator (1), multiple probe (10), multiple sensing circuit subsystem (11), described probe (10) is identical with described sensing circuit subsystem (11) quantity, and described probe (10) is that one_to_one corresponding is connected with described sensing circuit subsystem (11), described frequency-adjustable Multi-channel signal generator (1) is connected with multiple probes (10) and multiple sensing circuit subsystem (11) respectively；
Preamplifier (3) that described sensing circuit subsystem (11) includes being sequentially connected, the first converter (4), crystal filter (5), the second converter (6), band filter (7), low-noise amplifier (8), described frequency-adjustable Multi-channel signal generator (1) is connected with the first converter (4), the second converter (6) respectively, and described probe (10) is connected with described preamplifier (3).
Side-by-side array formula AC magnetic field sensing device the most according to claim 1, it is characterized in that: described probe (10) includes non-crystalline material parts (2), isolated amplifier (12), resistance (13), described resistance (13) one end is connected with described isolated amplifier (12) outfan, described resistance (13) other end is connected with described non-crystalline material parts (2), described frequency-adjustable Multi-channel signal generator (1) is connected with described isolated amplifier (12) input, and described non-crystalline material parts (2) are connected with described preamplifier (3).
Side-by-side array formula AC magnetic field sensing device the most according to claim 2, it is characterised in that:
Described frequency-adjustable Multi-channel signal generator (1): for providing the high frequency pumping frequency signal of described non-crystalline material parts (2), the modulation frequency signal of the first converter (4), the frequency, demodulation frequency signal of the second converter (6) respectively；
Described non-crystalline material parts (2): under the effect of high frequency pumping frequency signal, 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；The transducing signal of diverse location gives axial by non-crystalline material parts (2), along the AC magnetic field spatial distribution in its orientation；
Described preamplifier (3): the ac voltage signal for exporting non-crystalline material parts (2) tentatively amplifies and impedance transformation；
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 combination 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 band 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 band filter (7) to be filtered by other combination frequency signal；
Low-noise amplifier (8), is amplified described band filter (7) output signal.
Side-by-side array formula AC magnetic field sensing device the most according to claim 2, 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；Described non-crystalline material parts (2) equidistantly parallel arranged.
Side-by-side array formula AC magnetic field sensing device the most according to claim 4, it is characterised in that: described non-crystalline material parts (2) are amorphous wire or amorphous ribbon.
Side-by-side array formula AC magnetic field sensing device the most according to claim 1, it is characterised in that: described crystal filter (5) is narrow-band crystal filter.
Side-by-side array formula AC magnetic field sensing device the most according to claim 6, it is characterised in that: described narrow-band crystal filter is the narrow-band crystal filter of fixed frequency.
Side-by-side array formula AC magnetic field sensing device the most according to claim 1, it is characterised in that: described first converter (4) is the nonlinear device with frequency conversion function.
Side-by-side array formula AC magnetic field sensing device the most according to claim 8, it is characterised in that: described nonlinear device includes analog multiplier, frequency mixer.
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