CN101893693A - Magnetic-field dynamic compensation system and methods based on spatial correlation - Google Patents
Magnetic-field dynamic compensation system and methods based on spatial correlation Download PDFInfo
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Abstract
The invention relates to a magnetic-field dynamic compensation system and methods based on spatial correlation, wherein the system can realize the dynamic compensation of environment magnetic fields at the directions of three axles through a large set and a small set of Helmholtz coil racks and two fluxgate meters based on the spatial correlation of a PID (Proportion Integration Differentiation) negative feedback electronic circuit and the fluctuation of the environment magnetic fields. The invention further discloses three methods using the system, including (1) a proportioning type magnetic-field dynamic compensation method, (2) a series type integral magnetic-field dynamic compensation method, and (3) a parallel integral type magnetic-field dynamic compensation method. The system of the invention is easy to construct, has low cost and simple operation, and can achieve excellent dynamic compensation effect, and simultaneously, the methods can maximally eliminate the affects of the fluxgate meters to other magnetic detectors at the centers of coils, and have great application prospect in extremely-low field nuclear magnetic resonance, imaging thereof and other biological magnetic researches based on an SQUID (Superconducting Quantum Interference Device).
Description
Technical field
The present invention relates to the field compensation technical field, particularly relate to magnetic-field dynamic compensation system and method based on spatial coherence.
Background technology
Generally, earth environment magnetic field is 30 ~ 50 μ T.Since be subjected to external interference, as moving of the vehicles, the influence of power frequency and frequency multiplication thereof etc., environmental magnetic field has time fluctuation.Especially for the laboratory that is positioned at the urban district, the fluctuation of working time environmental magnetic field is very big, and the fluctuation of vertical direction reaches little tesla (μ T) magnitude, and the horizontal direction fluctuation also surpasses 100nT.And many experimental facilitiess, such as scanning electron microscope, neutron scattering tester and biological magnetic detector (magnetocardiogram instrument, magneticencephalogram instrument) etc., to the requirement of environmental magnetic field than higher, need be operated in the metastable magnetic field environment, therefore must suppress effectively the fluctuation of environmental magnetic field.
Method commonly used at present is to build a high performance magnetic shield room, and magnetic shield room is not easy to build, and cost is high.As a kind of replacement scheme cheaply, be suggested as a kind of effective, succinct magneti-field stabilizing method based on the magnetic-field dynamic compensation of negative-feedback principle.Dynamic compensating system generally is made up of three parts: (three) magnetic signal detector is used to detect the variation of external magnetic field environment; Feedback circuit: the detected signal of magnetic detector is handled, amplified, and the drive feedback coil; Tickler is driven by feedback circuit, produces the magnetic field opposite with external magnetic field, the fluctuation of compensating field.
The magnetic-field dynamic compensation method that adopts normally places Magnetic Sensor the central authorities of coil at present, though this method can obtain good compensation effect, but for some experiments to magnetic material or device sensitivity, such as based superconductive quantum interference device (Superconducting Quantum Interference Device, experiments such as biological magnetic SQUID) and extremely low magnetic resonance, need make above-mentioned dynamic compensation method no longer suitable with Magnetic Sensor away from hub of a spool.At this moment, in order to obtain stable magnetic field environment, need to consider to utilize the possibility of coming the magnetic field at compensating coil center away from the changes of magnetic field information of hub of a spool.
The low-frequency fluctuation in magnetic field is often because longer-distance interference causes thereby to have good spatial coherence usually, i.e. the fluctuation basically identical in diverse location magnetic field, and this will be for the invention provides good prerequisite.
Summary of the invention
Technical matters to be solved by this invention provides a kind of based on the magnetic-field dynamic compensation system of spatial coherence and the method for using this system, makes the low-frequency fluctuation (f:0 ~ 20 Hz) of environmental magnetic field reduce by one to two order of magnitude.
The technical solution adopted for the present invention to solve the technical problems is: a kind of magnetic-field dynamic compensation system based on spatial coherence is provided, comprise the first Helmholtz coils frame, the second Helmholtz coils frame, the first fluxgate meter, the second fluxgate meter and feedback electronic circuit, leave spacing between the described first Helmholtz coils frame and the second Helmholtz coils frame, and be parallel to each other, wherein, the described first Helmholtz coils frame is greater than the described second Helmholtz coils frame; Be wound with static and dynamic two cover coils on the described first Helmholtz coils frame and the second Helmholtz coils frame respectively; The described first Helmholtz coils frame center is provided with the first fluxgate meter, and the detection direction of the described first fluxgate meter is consistent with the described first Helmholtz coils frame direction; The described second Helmholtz coils frame center is provided with the second fluxgate meter, and the detection direction of the described second fluxgate meter is consistent with the described second Helmholtz coils frame direction; The described second fluxgate meter links to each other with the first Helmholtz coils frame by described feedback electronic circuit.
The described first Helmholtz coils frame is made up of 1.9m * 2.0m * three pairs of orthogonal square coils of 2.1m; The described second Helmholtz coils frame is made up of 0.62m * 0.62m * three pairs of orthogonal square coils of 0.62m.
Spacing between the described first Helmholtz coils frame and the second Helmholtz coils frame is 3 ~ 5 meters.
Described feedback electronic circuit is a PID negative feedback electronic circuit, comprises prime amplifier, proportion integration differentiation device, the power amplifier of series connection successively; The off-set value and the bandwidth of described prime amplifier, proportion integration differentiation device and power amplifier are adjustable.
Described feedback electronic circuit is arranged to ratio output or two kinds of mode of operations of integration output according to the connected mode of dynamic compensation coil on the dynamic compensation coil and the second Helmholtz coils frame on the described first Helmholtz coils frame.
The technical solution adopted for the present invention to solve the technical problems is: a kind of proportional-type magnetic-field dynamic compensation method based on spatial coherence also is provided, may further comprise the steps:
(1) the second Helmholtz coils frame is put into 3 ~ 5 meters of the distance first Helmholtz coils frame, both are parallel to each other in maintenance, then the second fluxgate meter is placed the second Helmholtz coils frame center, the first fluxgate meter is placed the center of the first Helmholtz coils frame, and make two fluxgate meters keep being parallel to each other, wherein, the described first Helmholtz coils frame is greater than the described second Helmholtz coils frame;
(2) the static compensation electric current of the adjusting first Helmholtz coils frame and the second Helmholtz coils frame makes the direct current offset value in both magnetic fields, center approach zero;
(3) feed back electronic circuit and be set to the ratio output mode;
(4) field signal that the second fluxgate meter is detected is input in the feedback electronic circuit, the dynamic compensation coil of feedback electronic circuit on computing, the amplification rear drive first Helmholtz coils frame, heart place produces and the opposite magnetic field of detecting of magnetic field equal and opposite in direction, direction therein, reach the effect of stablizing magnetic field, the first Helmholtz coils frame center, wherein, obtain the The optimal compensation effect by the off-set value and the bandwidth of regulating in the feedback electronic circuit.
The technical solution adopted for the present invention to solve the technical problems is: a kind of series connection integral form magnetic-field dynamic compensation method based on spatial coherence also is provided, may further comprise the steps:
(1) obtains the static state on the first Helmholtz coils frame and the second Helmholtz coils frame and the turn ratio of dynamic compensation coil by Theoretical Calculation, make under same current, the magnetic field unanimity that the static compensation coil of two coils produces, the magnetic field that the dynamic compensation coil produces is also consistent, wherein, the described first Helmholtz coils frame is greater than the described second Helmholtz coils frame;
(2) the second Helmholtz coils frame is put into 3 ~ 5 meters of the distance first Helmholtz coils frame, both are parallel to each other in maintenance, then the second fluxgate meter is placed the second Helmholtz coils frame center, the first fluxgate meter is placed the center of the first Helmholtz coils frame, and make two fluxgate meters keep being parallel to each other;
(3) mode of the dynamic compensation coil on the first Helmholtz coils frame and the second Helmholtz coils frame with series connection coupled together;
(4) the static compensation electric current of the adjusting first Helmholtz coils frame and the second Helmholtz coils frame makes the direct current offset value in both magnetic fields, center approach zero;
(5) feed back electronic circuit and be set to the integration output mode;
(6) field signal that the second fluxgate meter is detected is input in the feedback electronic circuit, the dynamic compensation coil of feedback electronic circuit on computing, the amplification rear drive first Helmholtz coils frame, heart place produces and the opposite magnetic field of detecting of magnetic field equal and opposite in direction, direction therein, reach the effect of stablizing magnetic field, the first Helmholtz coils frame center, wherein, obtain the The optimal compensation effect by the off-set value and the bandwidth of regulating in the feedback electronic circuit.
The technical solution adopted for the present invention to solve the technical problems is: a kind of integral form magnetic-field dynamic compensation method in parallel based on spatial coherence also is provided, may further comprise the steps:
(1) the second Helmholtz coils frame is put into 3 ~ 5 meters of the distance first Helmholtz coils frame, both are parallel to each other in maintenance, then the second fluxgate meter is placed the second Helmholtz coils frame center, the first fluxgate meter is placed the center of the first Helmholtz coils frame, and make two fluxgate meters keep being parallel to each other, wherein, the described first Helmholtz coils frame is greater than the described second Helmholtz coils frame;
(2) the dynamic compensation coil on the first Helmholtz coils frame and the second Helmholtz coils frame is coupled together in parallel, and make a Helmholtz coils frame consistent with the magnetic field that the second Helmholtz coils frame produces by the mode of series connection adjustable resistance;
(3) the static compensation electric current of the adjusting first Helmholtz coils frame and the second Helmholtz coils frame makes the direct current offset value in both magnetic fields, center approach zero;
(4) feed back electronic circuit and be set to the integration output mode;
(5) field signal that the second fluxgate meter is detected is input in the feedback electronic circuit, the dynamic compensation coil of feedback electronic circuit on computing, the amplification rear drive first Helmholtz coils frame, heart place produces and the opposite magnetic field of detecting of magnetic field equal and opposite in direction, direction therein, reach the effect of stablizing magnetic field, the first Helmholtz coils frame center, wherein, obtain the The optimal compensation effect by the off-set value and the bandwidth of regulating in the feedback electronic circuit.
Beneficial effect
Owing to adopted above-mentioned technical scheme, the present invention compared with prior art, have following advantage and good effect: system is easy to build, cost is low, simple to operate, and can obtain good dynamic compensation effect, this method can farthest be eliminated the influence of fluxgate meter to other magnetic detection devices of hub of a spool place simultaneously, in based on the utmost point low-field nuclear magnetic resonance of SQUID and imaging and the research of other biological magnetic good application prospects is arranged.
Description of drawings
Fig. 1 is a vertical direction magnetic field space correlativity synoptic diagram of the present invention;
Fig. 2 is a proportional-type magnetic-field dynamic compensation Helmholtz coils frame synoptic diagram of the present invention;
Fig. 3 is a series connection integral form magnetic-field dynamic compensation Helmholtz coils frame synoptic diagram of the present invention;
Fig. 4 is an integral form magnetic-field dynamic compensation Helmholtz coils frame synoptic diagram in parallel of the present invention;
Fig. 5 is a contrast synoptic diagram before and after the horizontal direction compensation;
Fig. 6 is a contrast synoptic diagram before and after the vertical direction compensation.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
First embodiment of the present invention relates to a kind of magnetic-field dynamic compensation system based on spatial coherence, comprise the first Helmholtz coils frame, the second Helmholtz coils frame, the first fluxgate meter, the second fluxgate meter and feedback electronic circuit, spacing between the described first Helmholtz coils frame and the second Helmholtz coils frame is 3 ~ 5 meters, and be parallel to each other, wherein, the described first Helmholtz coils frame is greater than the described second Helmholtz coils frame, Fig. 1 is a vertical direction magnetic field space correlativity synoptic diagram, curve 1 and curve 2 are respectively the environmental magnetic field curves of cyclical fluctuations that two fluxgate instrumentations get among the figure, as seen from the figure, spatial coherence is fine; Be wound with static and dynamic two cover coils on the described first Helmholtz coils frame and the second Helmholtz coils frame respectively; The described first Helmholtz coils frame center is provided with the first fluxgate meter, and the detection direction of the described first fluxgate meter is consistent with the described first Helmholtz coils frame direction; The described second Helmholtz coils frame center is provided with the second fluxgate meter, and the detection direction of the described second fluxgate meter is consistent with the described second Helmholtz coils frame direction; The described second fluxgate meter links to each other with the first Helmholtz coils frame by described feedback electronic circuit.
Can use the square Helmholtz coils frame of size two covers among the present invention, wherein big coil former (i.e. the first Helmholtz coils frame) is made up of 1.9m * 2.0m * three pairs of orthogonal square coils of 2.1m, and small coil frame (i.e. the second Helmholtz coils frame) is made up of 0.62m * 0.62m * three pairs of orthogonal square coils of 0.62m.Static and the dynamic two cover coils of coiling respectively separate a segment distance with two cover coil formers, and make every pair of coil of two cover coil formers parallel in twos on every pair of coil.
Two fluxgate score using among the present invention are not positioned over the center of two cover coils, and one of them places the small coil center, is used to survey the variation in magnetic field, and feeds back to the feedback electronic circuit; Another places big hub of a spool, plays the effect (also can not using in actual applications) that detects compensation effect.It is consistent with coil direction that the detection direction of two fluxgate meters should keep.
Electronic feedback circuit among the present invention can adopt proportional plus integral plus derivative controller (Proportional Integral Differentiated Controller, be called for short " PID ") the negative feedback electronic circuit, PID negative feedback electronic circuit comprises three ingredient: off-set value and bandwidth that prime amplifier, proportion integration differentiation device and power amplifier, these three parts all can manual adjustments.This circuit can be arranged to ratio output or two kinds of mode of operations of integration output according to the difference of two cover coil connected modes, realizes the negative feedback function of magnetic-field dynamic compensation.
Second embodiment of the present invention relates to a kind of proportional-type magnetic-field dynamic compensation method based on spatial coherence, its concrete steps are as follows: (1) is put into 3 ~ 5 meters of the distance first Helmholtz coils frame with the second Helmholtz coils frame, both are parallel to each other in maintenance, then the second fluxgate meter is placed the second Helmholtz coils frame center, the first fluxgate meter is placed the center of the first Helmholtz coils frame, and make two fluxgate meters keep being parallel to each other, wherein, the described first Helmholtz coils frame is greater than the described second Helmholtz coils frame; (2) the static compensation electric current of the adjusting first Helmholtz coils frame and the second Helmholtz coils frame makes the direct current offset value in both magnetic fields, center approach zero; (3) feed back electronic circuit and be set to the ratio output mode; (4) field signal that the second fluxgate meter is detected is input in the feedback electronic circuit, the dynamic compensation coil of feedback electronic circuit on computing, the amplification rear drive first Helmholtz coils frame, heart place produces and the opposite magnetic field of detecting of magnetic field equal and opposite in direction, direction therein, reach the effect of stablizing magnetic field, the first Helmholtz coils frame center, wherein, obtain the The optimal compensation effect by the off-set value and the bandwidth of regulating in the feedback electronic circuit.
Fig. 2 is a proportional-type magnetic-field dynamic compensation Helmholtz coils frame synoptic diagram.Among the figure, coil former 1 is big Helmholtz coils frame, and coil former 2 is little Helmholtz coils frame.Big Helmholtz coils frame and little Helmholtz coils frame, such as 3 meters and keep being parallel to each other at a distance of certain distance, respectively insert a fluxgate meter in both centers, and two fluxgate meters also will keep being parallel to each other.The PID feedback circuit is set to the ratio output mode.The variation in fluxgate meter 2 acquisition environment magnetic fields with its input PID feedback circuit, is carried out computing, is amplified rear drive coil former 1, and heart position produces equal and opposite in direction therein, and the compensating field that direction is opposite reaches the purpose of stabilizing magnetic field.
The 3rd embodiment of the present invention relates to a kind of series connection integration magnetic-field dynamic compensation method based on spatial coherence, its concrete steps are as follows: (1) obtains the static state on the first Helmholtz coils frame and the second Helmholtz coils frame and the turn ratio of dynamic compensation coil by Theoretical Calculation, make under same current, the magnetic field unanimity that the static compensation coil of two coils produces, the magnetic field that the dynamic compensation coil produces is also consistent, wherein, the described first Helmholtz coils frame is greater than the described second Helmholtz coils frame; (2) the second Helmholtz coils frame is put into 3 ~ 5 meters of the distance first Helmholtz coils frame, both are parallel to each other in maintenance, then the second fluxgate meter is placed the second Helmholtz coils frame center, the first fluxgate meter is placed the center of the first Helmholtz coils frame, and make two fluxgate meters keep being parallel to each other; (3) mode of the dynamic compensation coil on the first Helmholtz coils frame and the second Helmholtz coils frame with series connection coupled together; (4) the static compensation electric current of the adjusting first Helmholtz coils frame and the second Helmholtz coils frame makes the direct current offset value in both magnetic fields, center approach zero; (5) feed back electronic circuit and be set to the integration output mode; (6) field signal that the second fluxgate meter is detected is input in the feedback electronic circuit, the dynamic compensation coil of feedback electronic circuit on computing, the amplification rear drive first Helmholtz coils frame, heart place produces and the opposite magnetic field of detecting of magnetic field equal and opposite in direction, direction therein, reach the effect of stablizing magnetic field, the first Helmholtz coils frame center, wherein, obtain the The optimal compensation effect by the off-set value and the bandwidth of regulating in the feedback electronic circuit.
Fig. 3 is a series connection integral form magnetic-field dynamic compensation Helmholtz coils frame synoptic diagram.Among the figure, coil former 1 is big Helmholtz coils frame, and coil former 2 is little Helmholtz coils frame.Big Helmholtz coils frame and little Helmholtz coils frame, such as 5 meters and keep being parallel to each other at a distance of certain distance, and the dynamic compensation coil on the two Helmholtz coils framves couples together in the mode of series connection.Respectively insert a fluxgate meter in both centers, two fluxgate meters also will keep being parallel to each other.The PID feedback circuit is set to the integration output mode.The variation in fluxgate meter 2 acquisition environment magnetic fields with its input PID feedback circuit, is carried out computing, is amplified rear drive coil former 1, and heart position produces equal and opposite in direction therein, and the compensating field that direction is opposite reaches the purpose of stabilizing magnetic field.
The 4th embodiment of the present invention relates to a kind of integration magnetic-field dynamic compensation method in parallel based on spatial coherence, its concrete steps are as follows: (1) is put into 3 ~ 5 meters of the distance first Helmholtz coils frame with the second Helmholtz coils frame, both are parallel to each other in maintenance, then the second fluxgate meter is placed the second Helmholtz coils frame center, the first fluxgate meter is placed the center of the first Helmholtz coils frame, and make two fluxgate meters keep being parallel to each other, wherein, the described first Helmholtz coils frame is greater than the described second Helmholtz coils frame; (2) the dynamic compensation coil on the first Helmholtz coils frame and the second Helmholtz coils frame is coupled together in parallel, and make a Helmholtz coils frame consistent with the magnetic field that the second Helmholtz coils frame produces by the mode of series connection adjustable resistance; (3) the static compensation electric current of the adjusting first Helmholtz coils frame and the second Helmholtz coils frame makes the direct current offset value in both magnetic fields, center approach zero; (4) feed back electronic circuit and be set to the integration output mode; (5) field signal that the second fluxgate meter is detected is input in the feedback electronic circuit, the dynamic compensation coil of feedback electronic circuit on computing, the amplification rear drive first Helmholtz coils frame, heart place produces and the opposite magnetic field of detecting of magnetic field equal and opposite in direction, direction therein, reach the effect of stablizing magnetic field, the first Helmholtz coils frame center, wherein, obtain the The optimal compensation effect by the off-set value and the bandwidth of regulating in the feedback electronic circuit.
Fig. 4 is an integral form magnetic-field dynamic compensation Helmholtz coils frame synoptic diagram in parallel: coil former 1 is big Helmholtz coils frame, and coil former 2 is little Helmholtz coils frame.Big Helmholtz coils frame and little Helmholtz coils frame are at a distance of certain distance, such as 4 meters, and keep being parallel to each other, the dynamic compensation coil on the two Helmholtz coils framves couples together in parallel, and the adjustable rheostat of respectively connecting in two branch roads.Respectively insert a fluxgate meter in both centers, two fluxgate meters also will keep being parallel to each other.The PID feedback circuit is set to the integration output mode.The variation in fluxgate meter 2 acquisition environment magnetic fields with its input feedback circuit PID, is carried out computing, is amplified rear drive coil former 1, and heart position produces equal and opposite in direction therein, and the compensating field that direction is opposite reaches the purpose of stabilizing magnetic field.
Fig. 5 is a contrast synoptic diagram before and after the horizontal direction compensation, and curve 1 is a changes of magnetic field curve before the compensation among the figure, Δ B=206 nT; Curve 2 is compensation back changes of magnetic field curves, Δ B=13 nT.Fig. 6 is a contrast synoptic diagram before and after the vertical direction compensation, and curve 1 is a changes of magnetic field curve before the compensation among the figure, and Δ B=1503 nT, curve 2 are compensation back changes of magnetic field curves, Δ B=14 nT.Be not difficult to find that the present invention can farthest eliminate the influence of fluxgate meter to other magnetic detection devices of hub of a spool place, in based on the utmost point low-field nuclear magnetic resonance of SQUID and imaging and the research of other biological magnetic, good application prospects arranged.
Claims (8)
1. magnetic-field dynamic compensation system based on spatial coherence, comprise the first Helmholtz coils frame, the second Helmholtz coils frame, the first fluxgate meter, the second fluxgate meter and feedback electronic circuit, it is characterized in that, leave spacing between the described first Helmholtz coils frame and the second Helmholtz coils frame, and be parallel to each other, wherein, the described first Helmholtz coils frame is greater than the described second Helmholtz coils frame; Be wound with static and dynamic two cover coils on the described first Helmholtz coils frame and the second Helmholtz coils frame respectively; The described first Helmholtz coils frame center is provided with the first fluxgate meter, and the detection direction of the described first fluxgate meter is consistent with the described first Helmholtz coils frame direction; The described second Helmholtz coils frame center is provided with the second fluxgate meter, and the detection direction of the described second fluxgate meter is consistent with the described second Helmholtz coils frame direction; The described second fluxgate meter links to each other with the first Helmholtz coils frame by described feedback electronic circuit.
2. the magnetic-field dynamic compensation system based on spatial coherence according to claim 1 is characterized in that, the described first Helmholtz coils frame is made up of 1.9m * 2.0m * three pairs of orthogonal square coils of 2.1m; The described second Helmholtz coils frame is made up of 0.62m * 0.62m * three pairs of orthogonal square coils of 0.62m.
3. the magnetic-field dynamic compensation system based on spatial coherence according to claim 1 is characterized in that, the spacing between the described first Helmholtz coils frame and the second Helmholtz coils frame is 3 ~ 5 meters.
4. the magnetic-field dynamic compensation system based on spatial coherence according to claim 1 is characterized in that, described feedback electronic circuit is a PID negative feedback electronic circuit, comprises prime amplifier, proportion integration differentiation device, the power amplifier of series connection successively; The off-set value and the bandwidth of described prime amplifier, proportion integration differentiation device and power amplifier are adjustable.
5. the magnetic-field dynamic compensation system based on spatial coherence according to claim 1, it is characterized in that described feedback electronic circuit is arranged to ratio output or two kinds of mode of operations of integration output according to the connected mode of dynamic compensation coil on the dynamic compensation coil and the second Helmholtz coils frame on the described first Helmholtz coils frame.
6. a method of using the magnetic-field dynamic compensation system based on spatial coherence as claimed in claim 1 is characterized in that, may further comprise the steps:
(1) the second Helmholtz coils frame is put into 3 ~ 5 meters of the distance first Helmholtz coils frame, both are parallel to each other in maintenance, then the second fluxgate meter is placed the second Helmholtz coils frame center, the first fluxgate meter is placed the center of the first Helmholtz coils frame, and make two fluxgate meters keep being parallel to each other, wherein, the described first Helmholtz coils frame is greater than the described second Helmholtz coils frame;
(2) the static compensation electric current of the adjusting first Helmholtz coils frame and the second Helmholtz coils frame makes the direct current offset value in both magnetic fields, center approach zero;
(3) feed back electronic circuit and be set to the ratio output mode;
(4) field signal that the second fluxgate meter is detected is input in the feedback electronic circuit, the dynamic compensation coil of feedback electronic circuit on computing, the amplification rear drive first Helmholtz coils frame, heart place produces and the opposite magnetic field of detecting of magnetic field equal and opposite in direction, direction therein, reach the effect of stablizing magnetic field, the first Helmholtz coils frame center, wherein, obtain the The optimal compensation effect by off-set value and the bandwidth parameter of regulating in the feedback electronic circuit.
7. a method of using the magnetic-field dynamic compensation system based on spatial coherence as claimed in claim 1 is characterized in that, may further comprise the steps:
(1) obtains the static state on the first Helmholtz coils frame and the second Helmholtz coils frame and the turn ratio of dynamic compensation coil by Theoretical Calculation, make under same current, the magnetic field unanimity that the static compensation coil of two coils produces, the magnetic field that the dynamic compensation coil produces is also consistent, wherein, the described first Helmholtz coils frame is greater than the described second Helmholtz coils frame;
(2) the second Helmholtz coils frame is put into 3 ~ 5 meters of the distance first Helmholtz coils frame, both are parallel to each other in maintenance, then the second fluxgate meter is placed the second Helmholtz coils frame center, the first fluxgate meter is placed the center of the first Helmholtz coils frame, and make two fluxgate meters keep being parallel to each other;
(3) mode of the dynamic compensation coil on the first Helmholtz coils frame and the second Helmholtz coils frame with series connection coupled together;
(4) the static compensation electric current of the adjusting first Helmholtz coils frame and the second Helmholtz coils frame makes the direct current offset value in both magnetic fields, center approach zero;
(5) feed back electronic circuit and be set to the integration output mode;
(6) field signal that the second fluxgate meter is detected is input in the feedback electronic circuit, the dynamic compensation coil of feedback electronic circuit on computing, the amplification rear drive first Helmholtz coils frame, heart place produces and the opposite magnetic field of detecting of magnetic field equal and opposite in direction, direction therein, reach the effect of stablizing magnetic field, the first Helmholtz coils frame center, wherein, obtain the The optimal compensation effect by off-set value and the bandwidth parameter of regulating in the feedback electronic circuit.
8. a method of using the magnetic-field dynamic compensation system based on spatial coherence as claimed in claim 1 is characterized in that, may further comprise the steps:
(1) the second Helmholtz coils frame is put into 3 ~ 5 meters of the distance first Helmholtz coils frame, both are parallel to each other in maintenance, then the second fluxgate meter is placed the second Helmholtz coils frame center, the first fluxgate meter is placed the center of the first Helmholtz coils frame, and make two fluxgate meters keep being parallel to each other, wherein, the described first Helmholtz coils frame is greater than the described second Helmholtz coils frame;
(2) the dynamic compensation coil on the first Helmholtz coils frame and the second Helmholtz coils frame is coupled together in parallel, and make a Helmholtz coils frame consistent with the magnetic field that the second Helmholtz coils frame produces by the mode of series connection adjustable resistance;
(3) the static compensation electric current of the adjusting first Helmholtz coils frame and the second Helmholtz coils frame makes the direct current offset value in both magnetic fields, center approach zero;
(4) feed back electronic circuit and be set to the integration output mode;
(5) field signal that the second fluxgate meter is detected is input in the feedback electronic circuit, the dynamic compensation coil of feedback electronic circuit on computing, the amplification rear drive first Helmholtz coils frame, heart place produces and the opposite magnetic field of detecting of magnetic field equal and opposite in direction, direction therein, reach the effect of stablizing magnetic field, the first Helmholtz coils frame center, wherein, obtain the The optimal compensation effect by off-set value and the bandwidth parameter of regulating in the feedback electronic circuit.
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