CN103885006A - Alternating current magnetic field sensor with measuring frequency scanning function - Google Patents
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- CN103885006A CN103885006A CN201410127098.7A CN201410127098A CN103885006A CN 103885006 A CN103885006 A CN 103885006A CN 201410127098 A CN201410127098 A CN 201410127098A CN 103885006 A CN103885006 A CN 103885006A
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Abstract
The invention provides an alternating current magnetic field sensor with a measuring frequency scanning function. The alternating current magnetic field sensor with the measuring frequency scanning function comprises a frequency adjustable multi-passage signal generator (1), a first transducer (2), a crystal filter (5), a second transducer (6), a low pass filter (7), a low-noise amplifier (8) and a probe. The probe, the first transducer (4) and the second transducer (6) are respectively connected with the frequency adjustable multi-passage signal generator (1). The probe, the first transducer (4), the crystal filter (5), the second transducer (6), the low pass filter (7), and the low noise amplifier (8) are sequentially connected with one another. The alternating current magnetic field sensor has the advantages of being capable of scanning an alternating current frequency sensing magnetic field and effectively filtering noise and disturbance.
Description
Technical field
The present invention relates to weak magnetic measurement, AC magnetic field measurement mechanism technical field, relate in particular to the AC magnetic field sensor with survey frequency scan 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 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.
The magnetic field sensor that adopts giant magnetoresistance effect to make, its groundwork principle is in the time applying high frequency pumping current signal on amorphous wire (band), by the axial tested field signal of amorphous wire (band), the impedance at amorphous wire (band) two ends is changed with the variation of tested field signal, use related circuit form that this impedance variation is changed into other signal form, can realize the measurement to magnetic field.
The method that the principle that adopts at present the complex impedance of amorphous wire (band) to change with tested field signal is made sensor mainly contains two kinds: (1) changes the impedance variation of amorphous wire (band) into the variation of frequency, by amorphous wire (band) as variable reactive component, be applied to oscillatory circuit, its impedance variation changes the variation of frequency into, by to frequency signal processing, realize the detection of field signal, in circuit, generally comprise oscillatory circuit, rectification circuit (detecting circuit) and amplifying circuit.(2) directly measure the complex impedance at amorphous wire (band) two ends, such as, use electric bridge, amorphous wire (band) is applied on a brachium pontis of bridge diagram, the output of electric bridge be one with pumping signal same frequency, there is the signal of fixed phase difference, its amplitude versus frequency characte has been reacted the variation of impedance, realize the measurement of field signal, and use vector impedance method of testing, by the measurement to amorphous wire (band) both end voltage, current amplitude and phase place, realize complex impedance measurement.
In AC magnetic field measurement environment, exist various types of Noise and Interferences, and tested AC magnetic field signal is very faint, all filtering noise and the interference effectively of method that adopt at present.
Summary of the invention
In order to solve the problems of the prior art, the invention provides a kind of AC magnetic field sensor with survey frequency scan function.
The invention provides a kind of AC magnetic field sensor with survey frequency scan function, comprise the adjustable Multi-channel signal generator of frequency, the first frequency converter, crystal filter, the second frequency converter, low-pass filter, low noise amplifier, probe, described frequency is adjustable, and Multi-channel signal generator is connected with described probe, the first frequency converter and the second frequency converter respectively, and described probe, described the first frequency converter, described crystal filter, described the second frequency converter, described low-pass filter, described low noise amplifier are connected successively.
As a further improvement on the present invention, described probe comprises non-crystalline material parts, prime amplifier, direct current biasing coil, described non-crystalline material parts are connected with described prime amplifier input end, described frequency is adjustable, and Multi-channel signal generator is connected with described non-crystalline material parts, described direct current biasing coil winding is in described non-crystalline material member outer surface, and described prime amplifier output terminal is connected with described the first frequency converter;
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 direct current biasing coil: for generation of bias magnetic field;
Described non-crystalline material parts: under the effect at high frequency pumping frequency signal and DC bias magnetic field, 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;
Described prime amplifier: for the ac voltage signal of non-crystalline material parts output is tentatively amplified;
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 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 low-pass 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 low-pass filter that combination frequency is filtered;
Low noise amplifier, amplifies described low-pass 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.
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: AC magnetic field sensor filtering noise and the interference effectively with survey frequency scan function of the present invention.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Embodiment
As shown in Figure 1, the invention discloses a kind of AC magnetic field sensor with survey frequency scan function, comprise the adjustable Multi-channel signal generator 1 of frequency, the first frequency converter 4, crystal filter 5, the second frequency converter 6, low-pass filter 7, low noise amplifier 8, probe, described frequency is adjustable Multi-channel signal generator 1 respectively with described probe, the first frequency converter 4, and second frequency converter 6 be connected, described probe, described the first frequency converter 4, described crystal filter 5, described the second frequency converter 6, described low-pass filter 7, described low noise amplifier 8 is connected successively.
Described probe comprises non-crystalline material parts 2, prime amplifier 3, direct current biasing coil 9, described non-crystalline material parts 2 are connected with described prime amplifier 3 input ends, described frequency is adjustable, and 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 outside surfaces, and described prime amplifier 3 output terminals are connected with described the first frequency converter 4;
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 direct current biasing coil 9: for generation of bias magnetic field;
Described non-crystalline material parts 2: under the effect at high frequency pumping frequency signal and DC bias magnetic field, 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;
Described prime amplifier 3: tentatively amplify 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 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 low-pass 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 low-pass filter 7 that combination frequency is filtered;
Low noise amplifier 8, amplifies described low-pass 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.
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, low-pass filter 7 etc. needs the parts of setup parameter to remain unchanged at selected range of scanned frequencies intrinsic parameter.
Non-crystalline material parts 2 have GMI effect, non-crystalline material parts 2 are applied to high frequency pumping electric current and DC bias magnetic field, when measured signal AC magnetic field signal axial component can make its complex impedance change during by non-crystalline material parts 2, the alternating voltage amplitude of non-crystalline material parts 2 two ends outputs in circuit is also changed thereupon, by frequency converter, wave filter equifrequent alternative pack, the present invention can realize the measurement of the tested AC magnetic field signal to variable frequency.Non-crystalline material parts 2 high-frequency excitation signals are provided by the adjustable Multi-channel signal generator 1 of frequency, are connected in series current-limiting resistance in circuit, guarantee to provide suitable drive current.
For guaranteeing 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 low-pass 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 low-pass filter 7 by the part filtering of upper frequency.The input end of low-pass filter 7 is connected to the output terminal of the second frequency converter 6, and the output terminal of low-pass filter 7 is connected to low noise amplifier 8 input ends.
The output signal of low-pass 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: the probe that non-crystalline material parts 2 and biasing circuit form is placed in detected AC magnetic field space, frequency is adjustable, and Multi-channel signal generator 1 provides non-crystalline material parts 2 high-frequency AC excitation signal, provides driving to non-crystalline material parts 2.Apply suitable DC bias magnetic field, make non-crystalline material parts 2 in higher sensitivity duty.In the time that the axial component of tested AC magnetic field signal acts on non-crystalline material parts 2, the impedance of non-crystalline material parts 2 changes, and then the alternating voltage amplitude at non-crystalline material parts 2 two ends is changed with the variation of external communication field signal, reach the object that detects 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.
Non-crystalline material parts 2 still can use the narrow-band crystal filter of fixed frequency to carry out filtering when the frequency of tested AC magnetic field signal is changed, need to use the first frequency converter 4 to carry out frequency conversion to non-crystalline material parts 2 output signals, signal is modulated, by changing the modulating frequency of the first frequency converter 4, the signal frequency after modulation is remained in the centre frequency of narrow-band crystal filter.
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 low-pass 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 guarantee 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 guarantee 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 low-pass 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).
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 (8)
1. one kind has the AC magnetic field sensor of survey frequency scan function, it is characterized in that: comprise the adjustable Multi-channel signal generator of frequency (1), the first frequency converter (4), crystal filter (5), the second frequency converter (6), low-pass filter (7), low noise amplifier (8), probe, described frequency is adjustable Multi-channel signal generator (1) respectively with described probe, the first frequency converter (4), and second frequency converter (6) be connected, described probe, described the first frequency converter (4), described crystal filter (5), described the second frequency converter (6), described low-pass filter (7), described low noise amplifier (8) is connected successively.
2. AC magnetic field sensor according to claim 1, it is characterized in that: described probe comprises non-crystalline material parts (2), prime amplifier (3), direct current biasing coil (9), described non-crystalline material parts (2) are connected with described prime amplifier (3) input end, described frequency is adjustable, and 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) outside surface, and described prime amplifier (3) output terminal is connected with described the first frequency converter (4);
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 direct current biasing coil (9): for generation of bias magnetic field;
Described non-crystalline material parts (2): under the effect at high frequency pumping frequency signal and DC bias magnetic field, 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;
Described prime amplifier (3): for the ac voltage signal of non-crystalline material parts (2) output is tentatively amplified;
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 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 low-pass 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 low-pass filter (7) that combination frequency is filtered;
Low noise amplifier (8), amplifies described low-pass filter (7) output signal.
3. AC magnetic field sensor according to claim 2, 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.
4. AC magnetic field sensor according to claim 3, is characterized in that: described non-crystalline material parts (2) are amorphous wire or amorphous ribbon.
5. AC magnetic field sensor according to claim 2, is characterized in that: described crystal filter (5) is narrow-band crystal filter.
6. AC magnetic field sensor according to claim 5, is characterized in that: the narrow-band crystal filter that described narrow-band crystal filter is fixed frequency.
7. AC magnetic field sensor according to claim 2, is characterized in that: described the first frequency converter (4) is for having the nonlinear device of frequency conversion function.
8. AC magnetic field sensor according to claim 7, is characterized in that: described nonlinear device comprises analog multiplier, frequency mixer.
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| 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 |
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| CN107315150A (en) * | 2017-08-16 | 2017-11-03 | 中国地质大学（北京） | A kind of orthogonal basic 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 |
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| 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 |
| CN107315150A (en) * | 2017-08-16 | 2017-11-03 | 中国地质大学（北京） | A kind of orthogonal basic mode fluxgate sensor |
| 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 |
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