CN103885007A - Paralleling array type alternating-current magnetic field sensing device - Google Patents
Paralleling array type alternating-current magnetic field sensing device Download PDFInfo
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Abstract
The invention provides a paralleling array type alternating-current magnetic field sensing device which comprises a multi-channel signal generator (1) with adjustable frequency, a plurality of probes (10) and a plurality of sensing circuit subsystems (11). The probes (10) and the sensing circuit subsystems (11) are the same in number. The probes (10) and the sensing circuit subsystems (11) are connected in a one-to-one corresponding mode. The multi-channel signal generator (1) with adjustable frequency is connected with the probes (10) and the sensing circuit subsystems (11) respectively. The paralleling array type alternating-current magnetic field sensing device has the advantages that alternating-current space magnetic fields which are distributed in parallel can be detected accurately.
Description
Technical field
The present invention relates to weak magnetic measurement, AC magnetic field measurement mechanism technical field, relate in particular to array AC magnetic field sensing device arranged side by side.
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 measuring technique, conventional have polytype technology such as Hall effect, giant magnetoresistance effect, giant magnetoresistance effect and superconductive quantum interference effect, produced the Related products such as detecting coil sensor, giant magnetoresistance sensor, giant magnetic impedance sensor, Hall element, fluxgate sensor and superconducting quantum interference device (SQUID).
Compared with other sensing technology such as sensor and fluxgate sensor, giant magnetoresistance sensor etc. of employing giant magnetoresistance effect, on machinery, mechanics, chemistry and electromagnetic performance, all have a clear superiority in, there is higher sensitivity, especially there is the advantage such as miniature sizes and quick response, in this technical foundation, be developed into a large amount of novel sensors based on magnetic-field measurement.
Current AC magnetic field sensing device spatial resolution is not high, accurately detection space Distribution of Magnetic Field.
Summary of the invention
In order to solve the problems of the prior art, the invention provides a kind of array AC magnetic field sensing device side by side.
The invention provides a kind of array AC magnetic field sensing device side by side, comprise the adjustable Multi-channel signal generator of frequency, multiple probe, multiple sensing circuit subsystem, described probe is identical with described sensing circuit subsystem quantity, and described probe is with described sensing circuit subsystem for corresponding connected one by one, and described frequency is adjustable, and Multi-channel signal generator is connected with multiple sensing circuit subsystems with multiple probes respectively.
As a further improvement on the present invention, described sensing circuit subsystem comprises connected successively prime amplifier, the first frequency converter, crystal filter, the second frequency converter, bandpass filter, low noise amplifier, described frequency is adjustable, and Multi-channel signal generator difference the first frequency converter and the second frequency converter are connected, and described probe is connected with described prime amplifier.
As a further improvement on the present invention, described probe comprises non-crystalline material parts, isolated amplifier, resistance, described resistance one end is connected with described isolated amplifier output terminal, the described resistance other end is connected with described non-crystalline material parts, described frequency is adjustable, and Multi-channel signal generator is connected with described isolated amplifier input end, and described non-crystalline material parts are connected with described prime amplifier.
As a further improvement on the present invention,
Described frequency is adjustable Multi-channel signal generator: for the modulation frequency signal of described non-crystalline material parts high frequency pumping frequency signal, the first frequency converter, the frequency, demodulation frequency signal of the second frequency converter are provided respectively;
Described non-crystalline material parts: under the effect at high frequency pumping frequency signal, the complex impedance at described non-crystalline material parts two ends, along with the variation of the detected AC magnetic field signal by its axial component changes, produces the ac voltage signal that the detected AC magnetic field signal amplitude of reflection changes at the parts of non-crystalline material described in circuit two ends; The transducing signal of diverse location provided by non-crystalline material component axial, along the AC magnetic field space distribution in its orientation;
Described prime amplifier: for the ac voltage signal of non-crystalline material parts output is tentatively amplified and impedance transformation;
Described the first frequency converter: for ac voltage signal mixing or the frequency conversion with the output of non-crystalline material parts by the modulation frequency signal of adjustable described frequency Multi-channel signal generator output, the signal that contains the centre frequency that equals described crystal filter in the signal that described the first frequency converter is exported;
Described crystal filter, its centre frequency is described non-crystalline material parts excitation frequency, tested AC magnetic field signal frequency, frequency modulating signal combination frequency one, after this crystal filter, the output signal of all the other combination frequencies is by filtering;
Described the second frequency converter for described crystal filter output frequency signal and frequency, demodulation frequency signal are carried out to mixing or frequency conversion, contains tested AC magnetic field signal and other combination frequency signal after mixing or frequency conversion in described the second frequency converter output signal;
Described bandpass filter, in the signal of described the second frequency converter output, other combination frequency signal, far above tested AC magnetic field signal frequency, uses described bandpass filter that combination frequency is filtered;
Low noise amplifier, amplifies described bandpass filter output signal.
As a further improvement on the present invention, described non-crystalline material parts are the amorphous alloy material that Co base or Fe base have giant magnetoresistance effect; Described non-crystalline material parts (2) are parallel arranged equidistantly.
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, the narrow-band crystal filter that described narrow-band crystal filter is fixed frequency.
As a further improvement on the present invention, described the first frequency converter is the nonlinear device with frequency conversion function.
Described nonlinear device comprises analog multiplier, frequency mixer.
The invention has the beneficial effects as follows: array AC magnetic field sensing device simple structure arranged side by side of the present invention, can accurately detect the communication space magnetic field of parallel distributed.
Brief description of the drawings
Fig. 1 is theory diagram of the present invention.
Fig. 2 is sensing circuit subsystem theory diagram of the present invention.
Fig. 3 is probe theory diagram of the present invention.
Embodiment
As shown in Figure 1, the invention discloses a kind of array AC magnetic field sensing device side by side, comprise the adjustable Multi-channel signal generator 1 of frequency, 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 with described sensing circuit subsystem 11 for corresponding connected one by one, and described frequency is adjustable, and Multi-channel signal generator 1 is connected with multiple sensing circuit subsystems 11 with multiple probes 10 respectively.
As shown in Figure 2, described sensing circuit subsystem 11 comprises connected successively prime amplifier 3, the first frequency converter 4, crystal filter 5, the second frequency converter 6, bandpass filter 7, low noise amplifier 8, described frequency is adjustable, and Multi-channel signal generator 1 difference the first frequency converter 4 and the second frequency converter 6 are connected, and described probe 10 is connected with described prime amplifier 3.
As shown in Figure 3, described probe 10 comprises non-crystalline material parts 2, isolated amplifier 12, resistance 13, described resistance 13 one end are connected with described isolated amplifier 12 output terminals, described resistance 13 other ends are connected with described non-crystalline material parts 2, described frequency is adjustable, and Multi-channel signal generator 1 is connected with described isolated amplifier 12 input ends, and described non-crystalline material parts 2 are connected with described prime amplifier 3.
Described frequency is adjustable Multi-channel signal generator 1: for the modulation frequency signal of described non-crystalline material parts 2 high frequency pumping frequency signals, the first frequency converter 4, the frequency, demodulation frequency signal of the second frequency converter 6 are provided respectively;
Described non-crystalline material parts 2: under the effect at high frequency pumping frequency signal, the complex impedance at described non-crystalline material parts 2 two ends, along with the variation of the detected AC magnetic field signal by its axial component changes, produces the ac voltage signal that the detected AC magnetic field signal amplitude of reflection changes at the parts of non-crystalline material described in circuit 2 two ends; The transducing signal of diverse location provided by non-crystalline material component axial, along the AC magnetic field space distribution in its orientation;
Described prime amplifier 3: tentatively amplify and impedance transformation for the ac voltage signal that non-crystalline material parts 2 are exported;
Described the first frequency converter 4: ac voltage signal mixing or the frequency conversion of exporting for modulation frequency signal that adjustable described frequency Multi-channel signal generator 1 is exported and non-crystalline material parts 2, the signal that contains the centre frequency that equals described crystal filter 5 in the signal that described the first frequency converter 4 is exported;
Described crystal filter 5, its centre frequency is described non-crystalline material parts 2 excitation frequencies, tested AC magnetic field signal frequency, frequency modulating signal combination frequency one, after this crystal filter 5, the output signal of all the other combination frequencies is by filtering;
Described the second frequency converter 6 for described crystal filter 5 output frequency signals and frequency, demodulation frequency signal are carried out to mixing or frequency conversion, contains tested AC magnetic field signal and other combination frequency signal after mixing or frequency conversion in described the second frequency converter 6 output signals;
Described bandpass filter 7, in the signal that described the second frequency converter 6 is exported, other combination frequency signal, far above tested AC magnetic field signal frequency, uses described bandpass filter 7 that combination frequency is filtered;
Low noise amplifier 8, amplifies described bandpass filter 7 output signals.
Described non-crystalline material parts 2 are the amorphous alloy material that Co base or Fe base have giant magnetoresistance effect; The equidistant parallel arranged of described 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, the narrow-band crystal filter that described narrow-band crystal filter is fixed frequency.
Described the first frequency converter 4 is for having the nonlinear device of frequency conversion function, and described nonlinear device comprises analog multiplier, frequency mixer.
After the first frequency converter 4 mixing or frequency conversion, a combination frequency in non-crystalline material parts 2 two ends output signals is modulated onto in the centre frequency of narrow-band crystal filter.
In the time that detected AC magnetic field signal frequency changes, can be by the modulating frequency of corresponding change the first frequency converter 4, signal frequency after modulation is remained in the centre frequency of narrow-band crystal filter, therefore can use the narrow-band crystal filter of fixed frequency as filter part.
In the scanning process of survey frequency, that system is used is general, cheaply and the signal filtering that the first frequency converter 4 is exported of the narrow-band crystal filter of high performance fixed frequency, have good frequency selectivity can and simple system architecture.
The restituted signal that the signal that the second frequency converter 6 is exported narrow-band crystal filter and the adjustable Multi-channel signal generator 1 of frequency provide carries out mixing (frequency conversion), obtains the combination frequency signal of detected AC magnetic field signal and other upper frequency.
In the time that detected AC magnetic field signal frequency changes, can be by the frequency, demodulation frequency of corresponding change the second frequency converter 6, the combination frequency signal that makes the signal frequency after demodulation comprise detected AC magnetic field signal and other upper frequency.
The composite signal frequency of the upper frequency that the second frequency converter 6 is exported is greater than the more than ten times of tested AC magnetic field signal frequency.In the time that detected AC magnetic field signal frequency changes, narrow-band crystal filter, bandpass filter 7 etc. needs the parts of setup parameter to remain unchanged at selected range of scanned frequencies intrinsic parameter.
Use independently isolated amplifier 12 to isolate amorphous wire (band) high-frequency excitation signal, ensure that amorphous wire (band) the two ends output voltage on each passage does not interfere with each other in the situation that using same high-frequency excitation signal;
The equidistant parallel arranged of multiple non-crystalline material parts 2, can sensing by the axial AC magnetic field signal of amorphous wire, the transducing signal of diverse location provided by non-crystalline material parts 2 axial, along the AC magnetic field space distribution in its orientation.
For ensureing that follow-up signal treatment circuit does not affect the duty of non-crystalline material parts 2, and non-crystalline material parts 2 two ends output voltage signals are tentatively amplified, first the output voltage at non-crystalline material parts 2 two ends is sent to prime amplifier 3.Prime amplifier 3 has very high input impedance and very low output impedance, input signal is tentatively amplified simultaneously.The difference input of prime amplifier 3 is amorphous material components 2 both end voltage signals, and prime amplifier 3 output terminals are connected to the first frequency converter 4 input ends.
In prime amplifier 3 output voltage signals, comprise the combination frequency signal of tested AC magnetic field signal frequency and non-crystalline material parts 2 high-frequency excitation signal frequencies, need to carry out frequency conversion (mixing) to signal in order to use the narrow-band crystal filter of fixed frequency to carry out filtering to signal, the present invention is referred to as modulation, and the signal frequency after modulation equals the centre frequency of narrow-band crystal filter.
An output signal that input signal is prime amplifier 3 of the first frequency converter 4, another input signal is the modulation signal being provided by the adjustable Multi-channel signal generator 1 of frequency.In signal after modulation, comprise multiple combination frequency signals of detected AC magnetic field signal frequency, non-crystalline material parts 2 high-frequency AC excitation signal frequencies and frequency modulating signal.The frequency of modulation signal can be according to the frequency adjustment of tested AC magnetic field signal, makes a combination frequency that comprises detected AC signal frequency in the signal after modulation equal all the time the centre frequency of the narrow-band crystal filter with fixed frequency.
Narrow-band crystal filter has good frequency selective characteristic, has minimum relative bandwidth, can be used as narrow band filter and uses.For application scenarios such as eddy current metal defect detection, medical science lesion detection, tested AC magnetic field signal frequency at several KHz between hundreds of KHz, and frequency range general frequency band, small volume, monolithic crystal filter that low one-tenth is lower at 1MHz between tens MHz, in order to use general narrow-band crystal filter, the signal that contains detected AC magnetic field composition that need to export non-crystalline material parts 2 carries out frequency conversion (mixing).The input end of narrow-band crystal filter is connected to the first frequency converter 4 output terminals, and narrow-band crystal filter output terminal is connected to the second frequency converter 6 input ends.
The output signal of narrow-band crystal filter comprises multiple combination frequencies, the second frequency converter 6 carries out frequency conversion (mixing) to the output signal of narrow-band crystal filter, the present invention is referred to as demodulation, by adjusting restituted signal frequency, make to contain and be detected AC signal frequency and other higher composite signal frequency in the signal after demodulation.Larger with other combination frequency signal frequency difference due to tested AC magnetic field signal frequency, can utilize bandpass filter 7 by unwanted frequency target signal filter.An output signal that input signal is crystal filter 5 of the second frequency converter 6, another input signal is the modulation signal being provided by the adjustable Multi-channel signal generator 1 of frequency.
The combination frequency that comprises the ac-excited frequency of amorphous wire, frequency modulating signal and restituted signal frequency that tested AC magnetic field signal frequency that frequency is lower and frequency are higher in the frequency of the second frequency converter 6 output signals, can be used bandpass filter 7 by the part filtering of upper frequency.The input end of bandpass filter 7 is connected to the output terminal of the second frequency converter 6, and the output terminal of bandpass filter 7 is connected to low noise amplifier 8 input ends.
The output signal of bandpass filter 7 only comprises detected AC magnetic field signal, can reach the voltage that detects transposition requirement to its amplification.
Principle of work of the present invention is: organize equidistantly parallel arranged of amorphous wire (band) more, form straight line, drainage pattern along the axial communication space field signal of amorphous wire (band).
Amorphous wire (band) provides amorphous wire (band) high-frequency AC excitation signal by the adjustable hyperchannel output AC of frequency signal generator, provides driving to amorphous wire (band).In the time that the axial component of tested AC magnetic field signal in space acts on corresponding amorphous wire (band), the impedance of amorphous wire (band) is with space magnetic field Strength Changes, the alternating voltage amplitude at amorphous wire (band) two ends also changes thereupon, detects the detection that each amorphous wire (band) corresponding frequencies AC signal can implementation space AC magnetic field signal.
Enter the axial magnetic field of non-crystalline material parts 2 and not only comprise detected signal magnetic field and also deposit disturbing magnetic field and noise, detected field signal is very faint conventionally, be submerged in disturb and noise among, therefore need signal to carry out filtering and amplification.In system, detected field signal frequency is by default, frequency is known parameters, therefore can carry out to received signal wave filter by the extremely narrow crystal filter of utilized bandwidth, because the crystal filter realization of low frequency of operation is more difficult, and volume is larger, therefore system is used the crystal filter of higher centre frequency, can use for narrow-band crystal filter other purposes, mass-produced for cost consideration simultaneously, such as, for the crystal filter of fremodyne frequency range.
After narrow-band crystal filter filtering, the signal to noise ratio (S/N ratio) of detected signal is greatly improved.In crystal filter output signal, comprise the combination frequency of tested AC magnetic field signal frequency, non-crystalline material parts 2 exciting signal frequency, frequency modulating signal, can select one of them combination frequency, extract tested AC magnetic field signal frequency frequency by frequency conversion (mixing), signal is carried out to demodulation.In signal after demodulation, the frequency of other combination frequency signal, much larger than detected AC magnetic field signal frequency, can be used bandpass filter 7 filtering remainders.
Only comprise detected AC magnetic field signal frequency through the filtered signal of narrow band filter, utilize low noise amplifier 8 to amplify, can obtain the output signal of the detected AC magnetic field signal of enough amplitudes.
Frequency is adjustable, and Multi-channel signal generator 1 also can be described as the adjustable hyperchannel output AC of frequency signal generator.
Frequency is adjustable, and Multi-channel signal generator 1 output frequency calculates:
(1) non-crystalline material parts 2 high-frequency excitation signal frequencies are f
amo, the frequency modulating signal of the first frequency converter 4 is f
mod, the restituted signal frequency of the second frequency converter 6 is f
dem, detected AC magnetic field signal frequency is f
ext, frequency f
amodetermine according to amorphous wire material characteristic and circuit working point.(2) in non-crystalline material parts 2 two ends output voltage signals, comprise f
amo± f
extfrequency signal.(3) first frequency converters 4 are f by frequency
modmodulation signal and non-crystalline material parts 2 output frequencies be f
amo± f
extaC signal frequency conversion (mixing), produce and contain (f
amo± f
ext) ± f
modthe AC signal of radio-frequency component.(4) centre frequency of narrow-band crystal filter can be set as (f
amo± f
ext) ± f
modin one, suppose select centre frequency be f
amo+ f
ext+ f
mod.(5) second frequency converters 6 are f by narrow-band crystal filter output frequency
amo+ f
ext+ f
modsignal and frequency, demodulation frequency signal f
demcarry out frequency conversion (mixing), if restituted signal frequency is f
dem=f
amo+ f
mod, the radio-frequency component in the second frequency converter 6 output signals is f
extand f
ext+ 2f
amo+ 2f
mod, as long as ensure f
dem=f
amo+ f
modjust can obtain frequency is f
exttested AC magnetic field signal.
The invention has the beneficial effects as follows:
1. use the narrow-band crystal filter that filtering performance is good to carry out filtering to detected AC magnetic field signal, can obtain very high signal to noise ratio (S/N ratio).
2. by changing modulation signal and restituted signal frequency, can realize in whole frequency band tested AC magnetic field signal is carried out to frequency sweeping, can obtain the frequency response of accurate field signal.
3. the detected signal frequency of continuous variable is modulated to fixing frequency, can utilize general on market, cheaply, well behaved crystal filter 5 realizes narrow-band filtering, improved the cost performance of system.
4. because crystal filter 5 has fixing frequency, in demodulation, low-pass filtering and low noise amplifier circuit, can use the interlock circuit of preset parameter, reduce the complexity of design and the debugging of system.Frequency is adjustable, and Multi-channel signal generator 1 provides accurate, variable modulation and demodulation frequency, can ensure only to comprise and be detected AC magnetic field signal frequency in the output signal after demodulation.
5. in the signal that the second frequency converter 6 is exported, the frequency difference of detected AC magnetic field signal frequency and other combination frequency signal is larger, through bandpass filter 7 filtering thereafter, frequency outside tested AC magnetic field signal is significantly decayed, and system obtains good signal to noise ratio (S/N ratio).
6. amorphous wire (band) has very little physical dimension and very strong magnetic direction selectivity, utilizes the sensor that this characteristic is made can realize very high space magnetic field detection resolution.
7. under suitable amorphous wire (band) arrangement pitches, array AC magnetic field sensing device can be realized in the plane being axially made up of amorphous wire (band) orientation and amorphous wire (band) side by side, the measurement of axially going up the set of AC magnetic field along amorphous wire (band), these measuring-signals have reflected the spatial distribution state of AC magnetic field.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. an array AC magnetic field sensing device arranged side by side, it is characterized in that: comprise the adjustable Multi-channel signal generator of frequency (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 with described sensing circuit subsystem (11) for corresponding connected one by one, and described frequency is adjustable, and Multi-channel signal generator (1) is connected with multiple sensing circuit subsystems (11) with multiple probes (10) respectively.
2. array AC magnetic field sensing device arranged side by side according to claim 1, it is characterized in that: described sensing circuit subsystem (11) comprises connected successively prime amplifier (3), the first frequency converter (4), crystal filter (5), the second frequency converter (6), bandpass filter (7), low noise amplifier (8), described frequency is adjustable, and Multi-channel signal generator (1) is connected with the first frequency converter (4) and the second frequency converter (6) respectively, and described probe (10) is connected with described prime amplifier (3).
3. array AC magnetic field sensing device arranged side by side according to claim 1, it is characterized in that: described probe (10) comprises non-crystalline material parts (2), isolated amplifier (12), resistance (13), described resistance (13) one end is connected with described isolated amplifier (12) output terminal, described resistance (13) other end is connected with described non-crystalline material parts (2), described frequency is adjustable, and Multi-channel signal generator (1) is connected with described isolated amplifier (12) input end, and described non-crystalline material parts (2) are connected with described prime amplifier (3).
4. array AC magnetic field sensing device arranged side by side according to claim 3, is characterized in that: described frequency is adjustable Multi-channel signal generator (1): for the modulation frequency signal of described non-crystalline material parts (2) high frequency pumping frequency signal, the first frequency converter (4), the frequency, demodulation frequency signal of the second frequency converter (6) are provided respectively;
Described non-crystalline material parts (2): under the effect at high frequency pumping frequency signal, the complex impedance at described non-crystalline material parts (2) two ends, along with the variation of the detected AC magnetic field signal by its axial component changes, produces the ac voltage signal that the detected AC magnetic field signal amplitude of reflection changes at the parts of non-crystalline material described in circuit (2) two ends; The transducing signal of diverse location provided by non-crystalline material parts (2) axial, along the AC magnetic field space distribution in its orientation;
Described prime amplifier (3): for the ac voltage signal of non-crystalline material parts (2) output is tentatively amplified and impedance transformation;
Described the first frequency converter (4): for ac voltage signal mixing or the frequency conversion with non-crystalline material parts (2) output by the modulation frequency signal of adjustable described frequency Multi-channel signal generator (1) output, the signal that contains the centre frequency that equals described crystal filter (5) in the signal that described the first frequency converter (4) is exported;
Described crystal filter (5), its centre frequency is described non-crystalline material parts (2) excitation frequency, tested AC magnetic field signal frequency, frequency modulating signal combination frequency one, after this crystal filter (5), the output signal of all the other combination frequencies is by filtering;
Described the second frequency converter (6), for described crystal filter (5) output frequency signal and frequency, demodulation frequency signal are carried out to mixing or frequency conversion, after mixing or frequency conversion, in described the second frequency converter (6) output signal, contain tested AC magnetic field signal and other combination frequency signal;
Described bandpass filter (7), in the signal of described the second frequency converter (6) output, other combination frequency signal, far above tested AC magnetic field signal frequency, uses described bandpass filter (7) that combination frequency is filtered;
Low noise amplifier (8), amplifies described bandpass filter (7) output signal.
5. array AC magnetic field sensing device arranged side by side according to claim 3, is characterized 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) are parallel arranged equidistantly.
6. array AC magnetic field sensing device arranged side by side according to claim 5, is characterized in that: described non-crystalline material parts (2) are amorphous wire or amorphous ribbon.
7. array AC magnetic field sensing device arranged side by side according to claim 2, is characterized in that: described crystal filter (5) is narrow-band crystal filter.
8. array AC magnetic field sensing device arranged side by side according to claim 7, is characterized in that: the narrow-band crystal filter that described narrow-band crystal filter is fixed frequency.
9. array AC magnetic field sensing device arranged side by side according to claim 2, is characterized in that: described the first frequency converter (4) is for having the nonlinear device of frequency conversion function.
10. array AC magnetic field sensing device arranged side by side according to claim 9, is characterized in that: described nonlinear device comprises analog multiplier, frequency mixer.
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| CN105891743A (en) * | 2014-12-19 | 2016-08-24 | 中国人民解放军军械工程学院 | Excitation method and device of giant magneto-impedance sensor |
| CN108469593A (en) * | 2018-04-02 | 2018-08-31 | 南京麦科尼传感技术有限公司 | A kind of comprehensive magnetic field gradient sensor of high-resolution orthogonal fluxgate based on amorphous wire orthogonal array |
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| CN103885007B (en) | 2016-08-10 |
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