CN203551761U - Device for calibrating superconducting quantum interference device triaxial magnetometer - Google Patents
Device for calibrating superconducting quantum interference device triaxial magnetometer Download PDFInfo
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- CN203551761U CN203551761U CN201320646750.7U CN201320646750U CN203551761U CN 203551761 U CN203551761 U CN 203551761U CN 201320646750 U CN201320646750 U CN 201320646750U CN 203551761 U CN203551761 U CN 203551761U
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Abstract
The utility model provides a device for calibrating a superconducting quantum interference device triaxial magnetometer. The device comprises a signal generator used for generating a sinusoidal signal with a selected frequency and a set amplitude; a coil driven by the sinusoidal signal to generate a constant AC magnetic field; a cryostat used for maintaining operating temperature of the superconducting quantum interference device triaxial magnetometer; a rotating mechanism used for installing the coil and the cryostat, wherein the coil can be adjusted with any angle relative to the superconducting quantum interference device triaxial magnetometer in the horizontal plane and the vertical plane, and can generate a uniform AC magnetic field around the superconducting quantum interference device triaxial magnetometer; and a lock-in amplifier used for detecting a result of the superconducting quantum interference device triaxial magnetometer responding to the AC magnetic field according to the sinusoidal signal. The problem that calibration is difficult due to rotation of a probe itself of the superconducting quantum interference device (SQUID) triaxial magnetometer and due to the fact that an absolute magnetic field cannot be measured by a magnetometer is prevented, and calculation of correction coefficients is achieved.
Description
Technical field
The utility model belongs to magnetic field measurement technology field, relates to a kind of caliberating device, particularly relates to a kind of caliberating device of superconducting quantum interference device three axis magnetometer.
Background technology
Superconducting quantum interference device (superconducting Quantum Interference Device, SQUID) is current the sensitiveest known Magnetic Sensor, is widely used in the detection of faint magnetic signal.SQUID is a superconducting ring, by read superconducting ring enteroception to magnetic flux read magnetic field.Because the area of SQUID superconducting ring is very little, ring internal magnetic field is even, and the magnetic flux that SQUID surveys is just directly proportional to the magnetic field intensity of SQUID superconducting ring coupling.Therefore use SQUID superconducting ring plane coupling magnetic flux and SQUID to measure magnetic field and just formed SQUID magnetometer.
SQUID magnetometer is vector sensor, only measures the magnetic field of SQUID superconducting ring plane normal direction.In actual applications, measure magnetic field resultant field, need to measure three components of magnetic vector, be i.e. X-axis, Y-axis, three axial components of Z axis.By three axial components, obtain magnetic field resultant field.Use the resultant field in existing SQUID magnetometer survey magnetic field, need to use three SQUID magnetometers, three magnetometers are mutually vertical, are defined as respectively X-axis, Y-axis, three vertical components of Z axis.Three axis magnetometer records Vector Magnetic Field at the vector component of tri-vertical direction of XYZ, thereby obtains the measurement of resultant field.So the orthogonality of three axis magnetometer, the vertical property between axle and axle and the consistance between magnetometer are most important to the measurement accuracy of resultant field.If orthogonality is not high, what three axis magnetometer obtained is not completely orthogonal magnetic-field component, also comprises other magnetic-field components that orthogonal angles deviation is introduced, and therefore by above-mentioned formula, calculates the resultant field obtaining and has error with actual resultant field.On the other hand, magnetometer converts magnetic field intensity to voltage and measures, and therefore the magnetic field voltage transitions coefficient of the magnetometer of three axles is wanted accurate calibration, otherwise also can in resultant field calculates, introduce error.In sum, three axis magnetometer, before total field measurement application, carry out the demarcation of orthogonality demarcation and magnetic field voltage transitions coefficient, to meet the measurement requirement in diverse vector magnetic field, obtains resultant field numerical value accurately.
The demarcation of three axis magnetometer and bearing calibration can divide two classes, and a class is vector calibration, and magnetometer and given normal vector magnetic field compare calibration.Another kind of is scalar calibration, gives constant magnetic field of three axis magnetometer, and the scalar value in magnetic field and magnetic sensor are exported synthetic resultant field scalar and carried out comparison calibration.Because vector demarcation needs the space positioning apparatus that precision is very high, cost is high, implements difficulty large.The method of main flow is to adopt scalar calibration steps at present.The thought of scalar calibration is, to three axis magnetometer, load a constant magnetic field, change the angle of three axis magnetometer in magnetic field, obtain three-axle magnetic field component, according in the synthetic invariable principle of resultant field of arbitrarily angled lower three-axle magnetic field component, by the method for parametric solution, the orthogonal angles deviation of actual three axis magnetometer and magnetic field voltage transitions coefficient are obtained.Adopt parametric solution method to demarcate in the process of three axis magnetometer, constant magnetic field or even constant magnetic field space need to be provided, three axis magnetometer is rotated in this magnetic field, translation-angle, records three axle components.The three axle component datas that record under arbitrarily angled by one group are set up equation.Under even stationary magnetic field, any translation-angle, the synthetic resultant field of three axles is constant.Therefore obtain the measurement data of three-axis sensor under one group of any translation-angle, by parametric solution algorithms such as least squares, can obtain the magnetic field voltage transitions coefficient of three-axis sensor and the angular error of three axle quadrature module.
SQUID magnetometer is different from traditional magnetic resistance or magnetic flux magnetometer, and SQUID magnetometer can only be measured the changes of magnetic field amount from sensor starts the moment of measuring, and cannot realize the measurement of Absolute geomagnetic field.The SQUID three axis magnetometer that SQUID sensor forms, can only realize the measurement that exchanges variation magnetic field.Therefore to realize orthogonality and demarcate, will in space, three axis magnetometer place, produce the constant variation magnetic field of an interchange, will make three axis magnetometer around changes of magnetic field simultaneously, the output of three axis magnetometer is changed.
On the other hand, SQUID magnetometer uses low temperature or high temperature SQUID device, and device is operated in low temperature or hot environment lower time, as low-temperature superconducting SQUID is immersed in, fills with the temperature that maintains 4.2K in the cryostat that has liquid helium; High-temperature superconductor is immersed in fills with the working temperature that maintains 7.7K in the cryostat that has liquid nitrogen.Because cryostat volume is larger, make whole detector volume large, be inconvenient to move.In cryostat, pour into cryogenic liquid, rotating detector can cause that cryogenic liquid fluctuates widely simultaneously, makes SQUID because temperature is unstable or cryogenic liquid produces drum and affect work.Therefore SQUID sensor probe can not arbitrarily rotate.
Above-mentioned SQUID three axis magnetometer has two specific factors in application: what 1) three axis magnetometer of employing SQUID was measured is relative variation magnetic field, cannot calculate Absolute geomagnetic field; 2) thermostat of employing perfusion cryogenic liquid maintains the operation of SQUID sensor, and whole sensor probe can not arbitrarily rotate.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of caliberating device of superconducting quantum interference device three axis magnetometer, for solving existing calibration process SQUID three axis magnetometer, only identifies the problem that variation magnetic field and sensor probe can not arbitrarily rotate.
For achieving the above object and other relevant objects, the utility model provides a kind of caliberating device of superconducting quantum interference device three axis magnetometer.
A caliberating device for superconducting quantum interference device three axis magnetometer, comprising: signal generator, coil, cryostat, rotating mechanism, lock-in amplifier; Described signal generator produces the sinusoidal signal of selected frequency and the amplitude of setting; Described coil is connected with described signal generator, produces the AC magnetic field of constant amplitude under the driving of described sinusoidal signal; The built-in superconducting quantum interference device three axis magnetometer of described cryostat, for maintaining the working temperature of superconducting quantum interference device three axis magnetometer; Described rotating mechanism is used for installing described coil and described cryostat, make coil with respect to described superconducting quantum interference device three axis magnetometer in surface level and vertical plane with arbitrarily angled adjusting, at described superconducting quantum interference device three axis magnetometer, around produce the AC magnetic field of uniform constant amplitude; Described lock-in amplifier is connected with described signal generator, and the result that the three axis magnetometer of superconducting quantum interference device described in calibration process is responded to described AC magnetic field under the reference of described sinusoidal signal detects.
Preferably, described rotating mechanism comprises: support, and for vertical fixing described cryostat, the superconducting quantum interference device three axis magnetometer that makes to be positioned at described cryostat is static; Base, supports described support; Rotating disc, is socketed on described support, on surface level around the rotation of described support, drive simultaneously described coil around described support on surface level with Arbitrary Rotation; Turning axle, is arranged at the edge of described rotating disc, on a vertical plane with arbitrarily angled rotation, on surface level with rotating disc with arbitrarily angled revolution; Described coil is installed on described turning axle, at described superconducting quantum interference device three axis magnetometer, is around created on surface level and vertical plane the AC magnetic field with the constant amplitude of arbitrarily angled adjusting.
Preferably, described coil comprises the first side coil, the second side coil and connecting link; Described connecting link is built-in with connecting line, one end of described connecting line and described the first side coil electric connection, the other end and described the second side coil electric connection; The center of described connecting link is fixed on described turning axle; Described the first side coil and the second side coil are Helmholtz coils.
Preferably, described support comprises upper bracket and lower carriage, and the coupling part of described upper bracket and lower carriage is easily combined and easily taken apart; Described base is yi word pattern structure, and the base of yi word pattern structure is from support described in the bottom support of described lower carriage; The length of the connecting link in described coil is greater than the height of described upper bracket; When described lower carriage is connected with described upper bracket through described the first side coil or the second side coil, described coil is realized the setting that the anglec of rotation is 180 degree.
Preferably, the assembling separated with support of described base, the coupling part of base and support is easily combined and is easily taken apart; Described base is inverted T shape structure, and the base of inverted T shape structure is arranged at the bottom of described support, from frame bottom, supports described support; The length of the connecting link in described coil is greater than the height of described support; When the base of described inverted T shape structure is connected with described support through the center section of described the first side coil or the second side coil, described coil is realized the setting that the anglec of rotation is 180 degree; When the base of described inverted T shape structure replaces with the base of the type of falling ∏ structure, the described type of falling ∏ base is arranged at bottom or the both sides of described support, from support described in the bottom support of support or from support described in the lateral support of support.
Preferably, described rotating mechanism comprises fixed frame, swivel bearing; Described fixed frame comprises circular guideway, the stuck-module sliding along described circular guideway being arranged on surface level and the armed lever that supports fixing described circular guideway; Described stuck-module is fixed described cryostat, and drive described cryostat on surface level with Arbitrary Rotation; Described swivel bearing is arranged on described armed lever, on a vertical plane with arbitrarily angled rotation; Described coil is installed on described swivel bearing, and under the rotation of swivel bearing drives on a vertical plane centered by described superconducting quantum interference device three axis magnetometer with Arbitrary Rotation; Described coil is Helmholtz coils.
As mentioned above, the caliberating device of superconducting quantum interference device three axis magnetometer described in the utility model, has following beneficial effect:
The utility model has been avoided the rotation of SQUID magnetometer probe with respect to cryostat, guaranteed the stability of liquid in cryostat, evaded the impact that the liquid fluctuation in cryostat causes SQUID magnetometer probe, the problem that can not measure Absolute geomagnetic field for SQUID magnetometer simultaneously and be difficult to use stationary magnetic field to be demarcated, adopted the method for demarcating that exchanges, and by the mode of phase-locked amplification detection, adopt least-squares algorithm to realize obtaining of desired data, realized the calculating of correction coefficient.
Accompanying drawing explanation
Fig. 1 a is the structural representation of the caliberating device of superconducting quantum interference device three axis magnetometer described in the utility model.
Fig. 1 b is the schematic flow sheet of the scaling method of superconducting quantum interference device three axis magnetometer described in the utility model.
Fig. 2 a to Fig. 2 d is that the coil described in embodiment mono-is arranged on the structural representation on rotating mechanism.
Fig. 3 a to Fig. 3 b is the structural representation that the coil anglec of rotation described in embodiment mono-regulates the first solution of blind area.
Fig. 3 c to Fig. 3 d is the first structural representation that the coil anglec of rotation described in embodiment mono-regulates the second solution of blind area.
Fig. 3 e to Fig. 3 f is the second structural representation that the coil anglec of rotation described in embodiment mono-regulates the second solution of blind area.
Fig. 4 is the schematic flow sheet of the scaling method of the superconducting quantum interference device three axis magnetometer described in embodiment mono-.
Fig. 5 a is the support bracket fastened structural representation described in embodiment bis-.
Fig. 5 b is cryostat described in the embodiment bis-rotational structure schematic diagram on surface level.
Fig. 5 c is coil described in embodiment bis-rotational structure schematic diagram on a vertical plane.
Fig. 5 d is the side view of the rotating mechanism described in embodiment bis-.
Fig. 6 is the schematic flow sheet of the scaling method of the superconducting quantum interference device three axis magnetometer described in embodiment bis-.
Element numbers explanation
100 caliberating devices
110 signal generators
120 coils
121 first side coils
122 second side coils
123 connecting links
130 cryostats
140,500 rotating mechanisms
141 supports
1411 upper brackets
1412 lower carriages
142 bases
143 rotating discs
144 turning axles
150 lock-in amplifiers
160 guide rails
170 rollers
510 fixed frames
511 circular guideways
512 stuck-modules
513 armed levers
514 roller bearings
515 cylindrical drum
520 swivel bearings
600 superconducting quantum interference device three axis magnetometers
Embodiment
By specific instantiation, embodiment of the present utility model is described below, those skilled in the art can understand other advantages of the present utility model and effect easily by the disclosed content of this instructions.The utility model can also be implemented or be applied by other different embodiment, and the every details in this instructions also can be based on different viewpoints and application, carries out various modifications or change not deviating under spirit of the present utility model.
Refer to accompanying drawing.It should be noted that, the diagram providing in the present embodiment only illustrates basic conception of the present utility model in a schematic way, satisfy and only show with assembly relevant in the utility model in graphic but not component count, shape and size drafting while implementing according to reality, during its actual enforcement, kenel, quantity and the ratio of each assembly can be a kind of random change, and its assembly layout kenel also may be more complicated.
First, the orthogonality of the SQUID three axis magnetometer based on SQUID sensor is proofreaied and correct has its singularity, and SQUID three axis magnetometer is only measured relative variation magnetic field, cannot record Absolute geomagnetic field; Secondly, SQUID three axis magnetometer is placed in the cryostat of perfusion cryogenic liquid, and whole sensor probe can not move.The utility model has designed caliberating device and the scaling method of described superconducting quantum interference device (SQUID) three axis magnetometer for above-mentioned two dot characteristics.This caliberating device and scaling method are in order to apply current quadrature three axle bearing calibrations, need only identify variation magnetic field and irremovable feature for SQUID three axis magnetometer, design verification device, this calibration equipment is used to provide a constant variation field, and centered by three axis magnetometer, with Arbitrary Rotation, according to the data of obtaining, by correcting algorithm, realize correction coefficient and solve.
The place that the magnetic sensor of the superconducting quantum interference device that the utility model adopts (being called for short SQUID) is different from common Magnetic Sensor is: 1) superconducting quantum interference device (being called for short SQUID) Magnetic Sensor can only be measured the variable quantity in magnetic field, can not record Absolute geomagnetic field; 2) superconducting quantum interference device Magnetic Sensor need to be worked in filling has the cryostat of liquid helium, therefore whole magnetic sensor is subject to the restriction of liquid helium in cryostat (liquid), can not arbitrarily rotate, in order to avoid liquid helium rocks, cause temperature fluctuation, disturbance means work, so SQUID sensor can only be worked under vertical static laying state.
Magnetic field is vector.Three axle quadrature Magnetic Sensors are defined as respectively X, Y, Z axis Magnetic Sensor, and what each axial magnetic sensor recorded is that magnetic vector is in the projection of this axle, i.e. magnetic-field component.Therefore, three desirable axle quadrature Magnetic Sensors can obtain three quadrature components in magnetic field.If survey certain constant magnetic field with three axle quadrature Magnetic Sensors, need to make this stationary magnetic field to become angle arbitrarily with three axle quadrature Magnetic Sensors.The total magnetic field synthetic by three-axle magnetic field component is worth
be exactly this magnetic field intensity of stationary magnetic field at any angle, this intensity is invariable.Calibrating three-axle magnetic sensor calibration steps is measured arbitrarily angled stationary magnetic field based on three axle quadrature Magnetic Sensors exactly, and its synthetic total magnetic field keeps invariable this principle to carry out.Therefore, calibrating three-axle magnetic sensor method must meet following three conditions:
1) need a stationary magnetic field;
2) this stationary magnetic field and three axle quadrature Magnetic Sensors can keep arbitrarily angled;
3) by changing arbitrarily the angle of stationary magnetic field and three axle quadrature Magnetic Sensors, obtain the output of three each axles of axle quadrature Magnetic Sensor.
The utility model is in the feature for SQUID magnetic sensor, and meets under the precondition of calibration principle of three axle quadrature Magnetic Sensors, based on the constant principle in synthetic total magnetic field, and by parametric solution, the calibration parameter of acquisition three axle quadrature Magnetic Sensors.The calibration parameter of three axle quadrature Magnetic Sensors comprises the magnetic field voltage transitions coefficient of X, Y, Z tri-axles, and X-axis is with respect to the angular error of Z, and Y-axis is with respect to the angular error of X-Z face.Below in conjunction with embodiment and accompanying drawing, the utility model is elaborated.
Embodiment mono-
The present embodiment provides a kind of caliberating device of three axle quadrature superconducting quantum interference device (SQUID) magnetometers, and as shown in Figure 1a, this caliberating device 100 comprises: signal generator 110, coil 120, cryostat 130, rotating mechanism 140(is not shown), lock-in amplifier 150.
Described signal generator 110 produces the sinusoidal signal of selected frequency and the amplitude of setting.As AC magnetic field, excitation can make coil produce interchange stationary magnetic field to described sinusoidal signal, wherein the frequency of sinusoidal signal and amplitude can arrange flexibly by signal generator, once but set frequency and the amplitude of sinusoidal signal, the magnetic field that this AC signal excitation produces is exactly the constant AC magnetic field of amplitude (peak value).Because SQUID Magnetic Sensor can only be measured Absolute geomagnetic field, therefore use Helmholtz coils to introduce to exchange stationary magnetic field not only to have met the stationary magnetic field of demarcating three axle quadrature SQUID Magnetic Sensor needs, also solved the problem that SQUID Magnetic Sensor can only be measured Absolute geomagnetic field.
Described coil 120 is connected with described signal generator 110, produces the AC magnetic field of constant amplitude under the driving of described sinusoidal signal.Further, as shown in Fig. 2 a to Fig. 2 d, described coil 120 comprises the first side coil 121, the second side coil 122 and connecting link 123; Described connecting link 123 is built-in with connecting line, one end of described connecting line and described the first side coil 121 electric connections, the other end and described the second side coil 122 electric connections.Described the first side coil 121 is identical with the shape of the second side coil 122; Described the first side coil 121 and the second side coil 122 are circular coil, square coil, helical type coil, ellipse coil or irregular shape coil; The protection domain of described the first side coil 121 and the second side coil 122 is not limited to its shape.Described the first side coil 121 and the second side coil 122 are Helmholtz coils.In order to meet coil, can produce the requirement of constant AC magnetic field with Arbitrary Rotation, the coil turn of described coil must be wound around centered by SQUID sensor, and when coil rotates, it is equivalent to put arbitrarily on a sphere like this.Helmholtz coils (Helmholtz coil) is a kind of manufacture device of region uniform magnetic field among a small circle.Because Helmholtz coils has the character of opening wide, can at an easy rate other instruments be inserted in Helmholtz coils or shift out Helmholtz coils, also can directly do vision and observe, so Helmholtz coils is the normal device using of Physical Experiment.Because German physicist's Herman Feng Helmholtz names.At Helmholtz coils, load alternating current, Shi Qi center local produces uniform AC magnetic field, and the space of this homogeneous area covers the space at superconducting quantum interference device three axis magnetometer place.
The built-in superconducting quantum interference device three axis magnetometer of described cryostat 130, for placing superconducting quantum interference device three axis magnetometer, is perfused with cryogenic liquid in cryostat 130, for maintaining the working temperature of superconducting quantum interference device three axis magnetometer.
Described rotating mechanism 140 is for installing described coil 120 and fixing described cryostat 130, make coil 120 with respect to described superconducting quantum interference device three axis magnetometer in surface level and vertical plane with arbitrarily angled adjusting, at described superconducting quantum interference device three axis magnetometer, around produce the AC magnetic field of uniform constant amplitude.The fixed form of described cryostat 130 on described rotating mechanism 140 can be carried out suitable design according to the structure of rotating mechanism and actual needs, for example, by guide rail 160 and the roller 170 shown in Fig. 2 a to Fig. 2 c and Fig. 3 a to Fig. 3 d, be fixed connection.Centered by SQUID three axis magnetometer region, described rotating mechanism 140 drives Helmholtz coils in this central area rotation, produces the AC magnetic field of uniform frequency and constant amplitude in this central area.Described rotating mechanism 140 is at horizontal plane and the rotatable device of vertical plane, it has been realized drive Helmholtz coils and has rotated, make Helmholtz coils both can, around cryostat 130 360 degree rotations on surface level, also can carry out 0～180 degree rotation at the vertical plane Shangrao at cryostat 130 places central point.The utility model can be realized the change at any angle of AC magnetic field by rotating mechanism 140, thereby coordinates correcting algorithm, realizes orthogonality and proofreaies and correct.
Further, as shown in Fig. 2 a to Fig. 2 d, described rotating mechanism 140 comprises: support 141, base 142, rotating disc 143, turning axle 144.
Described support 141 is for vertical fixing described cryostat 130, and the superconducting quantum interference device three axis magnetometer that makes to be positioned at described cryostat is static.Described support 141 is hollow cylinder or at least 2 pillars, and every structure that can realize fixing cryostat and not affect any body of the normal work of rotating mechanism is all included in the scope of support described in the utility model.Cryostat 130 is enough placed in the inner space that described support 141 forms, and support 141 peripheries are without auxiliary body, and the inwall of support 141 directly supports thermostatic container, or the inwall of support 141 is provided with the parts that support thermostatic container.By regulating the height up and down of support 141 or cryogenic thermostat container 130, can be so that SQUID sensor probe be placed on the center in the test magnetic field of described coil 120 formations.Described support 141 can hold for spheroid, cylinder etc. are any the body that supports cryostat 130 and external rotating disc, and the protection domain of support 141 is not limited to several body types of enumerating described in the present embodiment.The utility model is arranged at cryostat 130 by superconducting quantum interference device three axis magnetometer, cryostat 130 is fixedly installed in support 141, because support is changeless, so be arranged in the Superconducting Quantum of cryostat 130, relate to device probe and also fix.Described support 141 can be realized with the right cylinder of circular hollow, and to improve physical strength, but the implementation structure of this support 141 includes but not limited to the right cylinder of circular hollow.It is static that the utility model adopts pillar to realize sensor, adopts rotating disc and turning axle can realize the Arbitrary Rotation of coil on surface level and vertical plane, solved SQUID sensor because using the liquid helium can only vertical static placement issue.The utility model has considered that SQUID sensor can only vertically keep the factor of stationary state placement work, therefore designed constant AC magnetic field that rotating mechanism vertical and that horizontal direction can be rotated arbitrarily makes coil generation around SQUID sensor with Arbitrary Rotation, the working method of rotating around stationary magnetic field from traditional sensor is completely different.
Described base 142 supports fixing described support 141.
Described rotating disc 143 is socketed on described support 141, on surface level around 141 rotations of described support, drive simultaneously described coil 120 around described support 141 on surface level with Arbitrary Rotation; Described turning axle 144 is arranged at the edge of described rotating disc 143, on a vertical plane with arbitrarily angled rotation, on surface level with rotating disc 143 with arbitrarily angled revolution; Described coil 120 is installed on described turning axle 144, at described superconducting quantum interference device three axis magnetometer, is around created on surface level and vertical plane the AC magnetic field with the constant amplitude of arbitrarily angled adjusting.Described coil 120 is installed on described turning axle 144, and particularly, described connecting link 123 is fixed on described turning axle 144 at center.Described rotating disc 143 can be circle, rectangle, square, ellipse or symmetrical irregularly shaped, also can be for realizing other arbitrary shapes of rotation, and the protection domain of rotating disc described in the utility model is not limited to its shape.When rotating disc 143 is arranged on horizontal plane, coil 120 can be realized surface level rotation around support 141, the turning axle 144 that is arranged at rotating disc 143 both sides can be realized the rotation at vertical plane with moving winding 120, and rotating mechanism 140 has been realized the rotation at any angle around a point.
Coil described in the utility model is arranged on rotating mechanism, and can along with rotating mechanism around support on horizontal plane with arbitrarily angled (360 degree) rotation, also can be along with rotating mechanism at vertical plane with Arbitrary Rotation.By this rotating mechanism, coil can be on SQUID three axis magnetometer rate of loading constant and only change the magnetic field of angle.The protection domain of rotating mechanism described in the utility model is not limited to several implementations that the present embodiment is enumerated, and everyly according to prior art, can realize within coil is all included in protection domain of the present utility model with the rotating mechanism of the angle rotation of any range around cryogenic thermostat container in any two vertical planes.In conjunction with rotation at any angle in any two vertical planes (as surface level and vertical plane), the utility model has been realized excitation field and has been produced rotation at any angle around SQUID three axis magnetometer, to produce the data of quadrature alignment.In order to make in space angular adjustment there is certain homogeneity and completeness (uniformly-spaced in situation, the angle of measuring and adjusting, can more evenly bear and cover in whole three-dimensional regulation space, various angles can cover simultaneously, meet completeness, make calculation of parameter solve error less), require coil to regulate by 360 degree on surface level, on vertical plane, there is the range of adjustment of 180 degree.
Coil is in the process of vertical plane rotation, owing to being subject to stopping of support, coil on a vertical plane adjustable angle can be restricted, there is the blind area of angular adjustment, cannot complete the angled adjusting within the scope of 0～180 degree, especially the connecting link of coil is longer, and the adjustable angle of coil is less, is subject to stopping of a column bottom more.Therefore, the utility model, on the basis of original design, has increased the solution of angular adjustment blind area, regulates the requirement of completeness to meet magnetic field angle.The blind area that pillar itself also can cause coil angle to regulate greatly due to diameter, thus coil regulate the region of process, use thinner pillar for well.The solution of the angular adjustment blind area that the utility model increases comprises:
1) as shown in Figure 3 a, support 141 is divided into upper and lower designing two portions, is called upper bracket 1411 and lower carriage 1412, also easily take apart the coupling part of upper bracket 1411 and lower carriage 1412 easily combination; The base 142 of yi word pattern structure is from support 141 described in the bottom support of described lower carriage 1412; The length of the connecting link 123 in coil 120 is greater than the height of described upper bracket 1411.Described upper bracket 1411 and lower carriage 1412 are taken apart, make coil 120 rotate to 180 degree (i.e. the first side coil directly over described upper bracket or under), make lower carriage pass described the first side coil or the second side coil is connected with described upper bracket, now the anglec of rotation range of adjustment of coil 120 as shown in Figure 3 b again.When described lower carriage is connected with described upper bracket through described the first side coil or the second side coil, described coil is realized the setting that the anglec of rotation is 180 degree.
2) as shown in Figure 3 c, base 142 is made as to inverted T shape structure, the base of inverted T shape structure is arranged at the bottom of described support, from frame bottom, supports described support; Because of the base of inverted T shape structure and the coupling part area of support 141 little, make the first side coil (or second side coil) can extend into when rotated the bottom of support, now the rotation angle range of coil is greater than by support the rotation angle range of the situation lower coil that stops (being yi word pattern base), has dwindled coil angular adjustment blind area on a vertical plane.Although the base of inverted T shape structure has dwindled the angular adjustment blind area of coil, but the base of this inverted T shape structure still can stop coil, make coil cannot rotate to 180 degree, this be the utility model proposes to further blind area solution, as shown in Figure 3 d, make the base and the separated assembling of support 141 of inverted T shape structure, also easily take apart the coupling part of the base of inverted T shape structure and support 141 easily combination, and the length of the connecting link in described coil is greater than the height of described upper bracket; Now the base of inverted T shape structure and support 141 are taken apart, make coil rotate to 180 degree, by the base of inverted T shape structure, the center section through described the first side coil (or second side coil) is connected with described support 141 again, so just having made up coil completely cannot rotate to 180 blind area, can record the measurement data in the situation that coil is positioned at 180 degree and near angle thereof, ideally solve the problem of the rotation blind area of coil, realized the coil angular adjustment of 0～180 degree on a vertical plane.When the base of described inverted T shape structure is connected with described support through the center section of described the first side coil or the second side coil, described coil is realized the setting that the anglec of rotation is 180 degree.Wherein, the base of inverted T shape structure also can be replaced by the base of the type of falling ∏ structure, and as shown in Fig. 3 e and 3f, the described type of falling ∏ base is arranged at bottom or the both sides of described support, from support described in the bottom support of support or from support described in the lateral support of support.The coil angle that makes up of the base of the type of falling ∏ structure regulates the principle of work of blind area identical with the base of inverted T shape structure, but it is more excellent to remain in actual applications the base effect of inverted T shape structure.
In a word, the object of above-mentioned measure is all the angle of spread loop adjusting on a vertical plane as far as possible, makes test obtain the data that the three-axle magnetic field in more different angles situations is measured, and improves the precision that three axle coefficients are demarcated.The algorithm that solves the parameter for demarcating due to the utility model is that the three-axle magnetic field component data by detecting under a plurality of different angles is realized, therefore the three-axle magnetic field component data of test is more, the angle difference of magnetic-field component is larger, and the calibration result obtaining is so more accurate.So caliberating device described in the utility model makes coil can rotate to angle arbitrarily as much as possible.But due to stopping of the pillar of positioned vertical SQUID thermostat, the angle limited (having occurred blind area) that coil rotates in the vertical direction, therefore, the utility model has added second coil that can penetrate pillar especially, realize the rotating mechanism expansion of scheduling adjustment ability in the vertical direction, make up the blind area of angular adjustment, realize as far as possible coil and regulate at any angle.
Described lock-in amplifier 150 is connected with described signal generator 110, and the result that the superconducting quantum interference device three axis magnetometer that is arranged in described cryostat 130 in calibration process is responded to described AC magnetic field under the reference of described sinusoidal signal detects.According to the feature of superconducting quantum interference device SQUID three axis magnetometer, in parallel coil, load AC magnetic field, use the response of lock-in amplifier detection three axis magnetometer, obtain the output voltage of X, Y, tri-direction magnetometers of Z, Vx, Vy, Yz.Again revolving coil, selectes a position, repeats above-mentioned detection, records magnetometer output voltage.Apply the parametric solution methods such as least square, try to achieve the magnetic field voltage transmission rate of three axis magnetometer, and the angular error of three axis magnetometer, the demarcation of magnetometer completed.Through the measurement data of a plurality of angles, obtain data more, calibrated and calculated is more accurate.
The principle of work of the caliberating device of superconducting quantum interference device three axis magnetometer described in the utility model is: utilize signal generator to produce the sinusoidal signal of selected frequency and the amplitude of setting, utilize described sinusoidal signal to drive Helmholtz coils at rotation center (be SQUID three axis magnetometer region, or cryostat region), to produce the simple alternating current magnetic field of constant amplitude by one drive circuit.The three axle components in this simple alternating current magnetic field are detected and zoom into voltage signal by SQUID three axis magnetometer respectively and export.The voltage signal that SQUID three axis magnetometer detects can read out by a sensing circuit, and inputs to lock-in amplifier.The voltage signal access lock-in amplifier of SQUID three axis magnetometer output, meanwhile, for driving the sinusoidal signal of the signal generator output of Helmholtz coils also to access lock-in amplifier; Lock-in amplifier is by sinusoidal signal with for referencial use, and the SQUID three axis magnetometer input that the response Helmholtz coils of same frequency is encouraged out.The voltage data detecting by lock-in amplifier is exactly the result of SQUID three axis magnetometer response simple alternating current uniform magnetic field.
Utilize rotating mechanism can regulate the angle of Helmholtz coils in surface level rotation and vertical plane rotation, to change the angle of even AC magnetic field and SQUID three axis magnetometer.Angle of every adjusting, records a SQUID three axis magnetometer and through lock-in amplifier, detects the magnitude of voltage of output.
Adjusting angle avoids institute's adjusting angle in a plane simultaneously arbitrarily, can obtain the data of arbitrarily angled lower SQUID three axis magnetometer output.The data of obtaining are The more the better, and angle variation range is the bigger the better.
The AC magnetic field component detecting according to arbitrarily angled lower SQUID three axis magnetometer is according to the synthetic total magnetic field of constant principle, magnetic field.By least-squares algorithm, calculate the correction coefficient that obtains SQUID three axis magnetometer again.
The present embodiment also provides a kind of scaling method of superconducting quantum interference device three axis magnetometer, this scaling method can be realized by caliberating device described in the utility model, but the implement device of this scaling method includes but not limited to caliberating device described in the utility model.
As shown in Figure 1a, described scaling method comprises:
Utilize a signal generator to produce the sinusoidal signal of selected frequency and the amplitude of setting.
Utilize described sinusoidal signal to drive a coil to produce the AC magnetic field of constant amplitude.Described coil comprises the first side coil, the second side coil and connecting link; Described connecting link is built-in with connecting line, one end of described connecting line and described the first side coil electric connection, the other end and described the second side coil electric connection; Described the first side coil and the second side coil are Helmholtz coils.
Utilize the built-in superconducting quantum interference device three axis magnetometer of a cryostat to maintain the working temperature of superconducting quantum interference device three axis magnetometer.
Utilize a rotating mechanism that described coil and described cryostat are installed, make coil with respect to described superconducting quantum interference device three axis magnetometer in surface level and vertical plane with arbitrarily angled adjusting, at described superconducting quantum interference device three axis magnetometer, around produce the AC magnetic field of uniform constant amplitude.Further, utilize a support vertical to fix described cryostat, the superconducting quantum interference device three axis magnetometer that makes to be positioned at described cryostat is static; Utilize a base to support described support; Described base is yi word pattern, inverted T shape or the type of falling ∏; Described yi word pattern base or inverted T shape base are arranged at the bottom of described support, from frame bottom, support described support; The described type of falling ∏ base is arranged at bottom or the both sides of described support, from support described in the bottom support of support or from support described in support lateral support.Utilize one be socketed on described support and on surface level around the rotating disc of described support rotation drive described coil around described support on surface level with Arbitrary Rotation; Utilize an edge that is arranged at described rotating disc, and on a vertical plane with arbitrarily angled rotation, and with rotating disc, with the turning axle of arbitrarily angled revolution, described coil is installed on surface level, make coil around be created on surface level and vertical plane the AC magnetic field with the constant amplitude of arbitrarily angled adjusting at described superconducting quantum interference device three axis magnetometer, shown in Figure 4.The center of described connecting link is fixed on described turning axle, with the rotation of turning axle and revolution band moving winding on surface level and vertical plane with Arbitrary Rotation.
Coil is in the process of vertical plane rotation, owing to being subject to stopping of support, coil on a vertical plane adjustable angle can be restricted, there is the blind area of angular adjustment, cannot complete the angled adjusting within the scope of 0～180 degree, especially the connecting link of coil is longer, and the adjustable angle of coil is less, is subject to stopping of a column bottom more.Therefore, the utility model, on the basis of original design, has increased the solution of angular adjustment blind area, regulates the requirement of completeness to meet magnetic field angle.The solution that has increased angular adjustment blind area comprises:
1) as shown in Figure 3 a, support 141 is divided into upper and lower designing two portions, is called upper bracket 1411 and lower carriage 1412, also easily take apart the coupling part of upper bracket 1411 and lower carriage 1412 easily combination; Base 142 is yi word pattern structure, and the base 142 of yi word pattern structure is from support 141 described in the bottom support of described lower carriage 1412; The length of the connecting link 123 in coil 120 is greater than the height of described upper bracket 1411.Described upper bracket 1411 and lower carriage 1412 are taken apart, make coil 120 rotate to 180 degree (i.e. the first side coil directly over described upper bracket or under), make lower carriage pass described the first side coil or the second side coil is connected with described upper bracket, now the anglec of rotation range of adjustment of coil 120 as shown in Figure 3 b again.
2) as shown in Figure 3 c, base 142 is made as to inverted T shape structure, the base of inverted T shape structure is arranged at the bottom of described support, from frame bottom, supports described support; Because of the base of inverted T shape structure and the coupling part area of support 141 little, make the first side coil (or second side coil) can extend into when rotated the bottom of support, now the rotation angle range of coil is greater than by support the rotation angle range of the situation lower coil that stops (being yi word pattern base), has dwindled coil angular adjustment blind area on a vertical plane.Although the base of inverted T shape structure has dwindled the angular adjustment blind area of coil, but the base of this inverted T shape structure still can stop coil, make coil cannot rotate to 180 degree, this be the utility model proposes to further blind area solution, as shown in Figure 3 d, make the base and the separated assembling of support 141 of inverted T shape structure, also easily take apart the coupling part of the base of inverted T shape structure and support 141 easily combination, and the length of the connecting link in described coil is greater than the height of described upper bracket; Now the base of inverted T shape structure and support 141 are taken apart, make coil rotate to 180 degree, by the base of inverted T shape structure, the center section through described the first side coil (or second side coil) is connected with described support 141 again, so just having made up coil completely cannot rotate to 180 blind area, can record the measurement data in the situation that coil is positioned at 180 degree and near angle thereof, ideally solve the problem of the rotation blind area of coil, realized the coil angular adjustment of 0～180 degree on a vertical plane.Wherein, the base of inverted T shape structure also can be replaced by the base of the type of falling ∏ structure, and as shown in Fig. 3 e and 3f, the described type of falling ∏ base is arranged at bottom or the both sides of described support, from support described in the bottom support of support or from support described in the lateral support of support.The coil angle that makes up of the base of the type of falling ∏ structure regulates the principle of work of blind area identical with the base of inverted T shape structure, but it is more excellent to remain in actual applications the base effect of inverted T shape structure.
With described sinusoidal signal, for examining, the result of utilizing a lock-in amplifier being connected with described signal generator that the superconducting quantum interference device three axis magnetometer that is arranged in described cryostat in calibration process is responded to described AC magnetic field detects.
The utility model is by rotation excitation magnetic field, and multi-angle test SQUID three axis magnetometer result, obtains multi-group data.Any regulating winding position, the direction that makes to be carried in the uniform magnetic field vector on magnetometer regulates arbitrarily, and direction variation is not confined in a plane.Constantly regulate magnetic direction, every adjusting Primary field direction, records a magnetometer output, through repeatedly measuring, obtains a plurality of data, forms one group of data.As long as selected angle is not limited in same plane, just can use one group of test data, by equation solution, realize poor the solving of three axis magnetometer magnetic flux voltage conversion ratio and orthogonal angles, complete the demarcation of SQUID magnetic sensor.
Embodiment bis-
The present embodiment provides a kind of caliberating device and method of superconducting quantum interference device three axis magnetometer, and the caliberating device described in itself and embodiment mono-and the difference of method are: the rotating mechanism described in embodiment mono-be band moving winding centered by described superconducting quantum interference device three axis magnetometer on horizontal plane and vertical plane with Arbitrary Rotation; Be cryostat transfixion, coil rotates on surface level and vertical plane around cryostat, shown in Figure 4.And rotating mechanism described in the present embodiment be band moving winding centered by described superconducting quantum interference device three axis magnetometer on a vertical plane with Arbitrary Rotation, by driving cryostat to realize coil adjusting on surface level with respect to superconducting quantum interference device three axis magnetometer with Arbitrary Rotation on surface level; Be that cryostat rotates on surface level, coil rotates on a vertical plane around cryostat, shown in Figure 6.Be no matter rotation mode described in embodiment mono-or the rotation mode described in embodiment bis-, can both realize the purpose of this utility model: 1) guarantee the horizontal positioned of superconducting quantum interference device three axis magnetometer in cryostat; 2) at superconducting quantum interference device three axis magnetometer, around produce the AC magnetic field of the constant amplitude that a direction can regulate arbitrarily.
As shown in Fig. 5 a to 5d, described rotating mechanism 500 comprises that fixed frame 510(is not shown), swivel bearing 520.Described fixed frame 510 comprises circular guideway 511, the stuck-module 512 sliding along described circular guideway being arranged on surface level and the armed lever 513 that supports fixing described circular guideway.The fixing described cryostat 130 of described stuck-module 512, and drive described cryostat on surface level with Arbitrary Rotation.Described stuck-module 512 can lead to a cylindrical drum 515 or the fixing described cryostat 130 of miscellaneous part.Described stuck-module 512 slides along described circular guideway by parts such as roller bearing 514 or rollers.Described swivel bearing 520 is arranged on described armed lever 513, on a vertical plane with arbitrarily angled rotation.Described coil 120 is installed on described swivel bearing 520, and under the rotation of swivel bearing drives on a vertical plane centered by the superconducting quantum interference device three axis magnetometer 600 in being built in cryostat 130 with Arbitrary Rotation; Described coil is Helmholtz coils.From Fig. 5 a to 5d, can find out, described circular guideway 511 is circular, the cryostat of being fixed by stuck-module is placed in the centre of circular guideway just, makes to be built in the center that superconducting quantum interference device three axis magnetometer in cryostat is positioned at described circular guideway.Described armed lever 513 comprises left arm bar and have armed lever, and left arm bar and right arm bar are symmetrically set in the both sides of circular guideway.Described swivel bearing 520 comprises anticlockwise bearing and right rotation bearing, and anticlockwise bearing is arranged on left arm bar, and right rotation bearing is arranged on right arm bar, and anticlockwise bearing is identical apart from the length at the center of circular guideway with right rotation bearing.
The feature that the utility model can only be surveyed relative magnetic field for sensor has adopted Helmholtz coils to produce the AC magnetic field of constant amplitude.The utility model is for realizing the angle problem in variable magnetic field arbitrarily, adopted the scheme of magnetic field being carried out to the adjusting of two degree of freedom, by vertical plane arbitrarily on angular adjustment and surface level arbitrarily angular adjustment to realize stationary magnetic field variable arbitrarily with respect to the angle of described superconducting quantum interference device three axis magnetometer.Wherein, the angular adjustment the utility model on vertical plane completes by rotating parallel Helmholtz coils.Angular adjustment on surface level, the utility model is by making coil around cryostat 360 degree rotations and making cryostat allow two approach of 360 degree rotation realize at rail plate.The utility model is for working in the cryostat of in-built liquid helium because of SQUID sensing, so cryostat can only keep level, and the problem that probe vertical is placed down, has adopted support (embodiment mono-) and two kinds of modes of fixed support (embodiment bis-) to solve.
Described in the utility model embodiment mono-, the advantage of scheme is that superconducting quantum interference device three axis magnetometer and cryostat remain motionless, and shortcoming is the evasive action that coil need to carry out angular adjustment blind area while rotating on a vertical plane.Described in the utility model embodiment bis-, the advantage of scheme is that coil does not have blind area in the adjusting of surface level and vertical plane, really having realized AC magnetic field regulates at any angle with respect to superconducting quantum interference device three axis magnetometer, shortcoming is that the angular adjustment of surface level need to be rotated cryostat, but the circular guideway in fixed support can guarantee the stable of the interior liquid level of cryostat, kept probe vertical (probe to be immersed in low-temperature liquid helium or liquid nitrogen all the time) down.The related SQUID sensor of the utility model is contained high-temperature superconductor SQUID and low-temperature superconducting SQUID, and therefore the cryogenic liquid in described cryostat comprises liquid helium (4.2K, for low temperature SQUID) and liquid nitrogen (77K, for high temperature SQUID device).
The utility model, for the singularity of superconduction SQUID sensor, has solved the SQUID sensor three axle orthogonality problem of calibratings that conventional method can't resolve.The utility model utilizes a Helmholtz coils, mode by revolving coil obtains the AC magnetic field around the rotation of SQUID three axis magnetometer that a constant amplitude, direction can regulate arbitrarily, realizes the transmission coefficient of SQUID three axis magnetometer and demarcates and orthogonality verification.The utility model has been avoided the rotation of SQUID magnetometer probe with respect to cryostat, guaranteed the stability of liquid in cryostat, evaded the impact that the liquid fluctuation in cryostat causes SQUID magnetometer probe, the problem that can not measure Absolute geomagnetic field for SQUID magnetometer simultaneously and be difficult to use stationary magnetic field to be demarcated, adopted the method for demarcating that exchanges, and by the mode of phase-locked amplification detection, adopt least-squares algorithm to realize obtaining of desired data, realized the calculating of correction coefficient.
In sum, the utility model has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all can, under spirit of the present utility model and category, modify or change above-described embodiment.Therefore, have in technical field under such as and conventionally know that the knowledgeable modifies or changes not departing from all equivalences that complete under spirit that the utility model discloses and technological thought, must be contained by claim of the present utility model.
Claims (6)
1. a caliberating device for superconducting quantum interference device three axis magnetometer, is characterized in that, the caliberating device of described superconducting quantum interference device three axis magnetometer comprises:
Signal generator, produces the sinusoidal signal of selecting frequency and the amplitude of setting;
Coil, is connected with described signal generator, produces the AC magnetic field of constant amplitude under the driving of described sinusoidal signal;
Cryostat, built-in superconducting quantum interference device three axis magnetometer, for maintaining the working temperature of superconducting quantum interference device three axis magnetometer;
Rotating mechanism, be used for installing described coil and described cryostat, make coil with respect to described superconducting quantum interference device three axis magnetometer in surface level and vertical plane with arbitrarily angled adjusting, at described superconducting quantum interference device three axis magnetometer, around produce the AC magnetic field of uniform constant amplitude;
Lock-in amplifier, is connected with described signal generator, and the result that the three axis magnetometer of superconducting quantum interference device described in calibration process is responded to described AC magnetic field under the reference of described sinusoidal signal detects.
2. the caliberating device of superconducting quantum interference device three axis magnetometer according to claim 1, is characterized in that: described rotating mechanism comprises:
Support, for vertical fixing described cryostat, the superconducting quantum interference device three axis magnetometer that makes to be positioned at described cryostat is static;
Base, supports described support;
Rotating disc, is socketed on described support, on surface level around the rotation of described support, drive simultaneously described coil around described support on surface level with Arbitrary Rotation;
Turning axle, is arranged at the edge of described rotating disc, on a vertical plane with arbitrarily angled rotation, on surface level with rotating disc with arbitrarily angled revolution; Described coil is installed on described turning axle, at described superconducting quantum interference device three axis magnetometer, is around created on surface level and vertical plane the AC magnetic field with the constant amplitude of arbitrarily angled adjusting.
3. the caliberating device of superconducting quantum interference device three axis magnetometer according to claim 2, is characterized in that: described coil comprises the first side coil, the second side coil and connecting link; Described connecting link is built-in with connecting line, one end of described connecting line and described the first side coil electric connection, the other end and described the second side coil electric connection; The center of described connecting link is fixed on described turning axle; Described the first side coil and the second side coil are Helmholtz coils.
4. the caliberating device of superconducting quantum interference device three axis magnetometer according to claim 3, is characterized in that: described support comprises upper bracket and lower carriage, and the coupling part of described upper bracket and lower carriage is easily combined and easily taken apart; Described base is yi word pattern structure, and the base of yi word pattern structure is from support described in the bottom support of described lower carriage; The length of the connecting link in described coil is greater than the height of described upper bracket; When described lower carriage is connected with described upper bracket through described the first side coil or the second side coil, described coil is realized the setting that the anglec of rotation is 180 degree.
5. the caliberating device of superconducting quantum interference device three axis magnetometer according to claim 3, is characterized in that: the assembling separated with support of described base, the easily combination and easily taking apart of the coupling part of base and support; Described base is inverted T shape structure, and the base of inverted T shape structure is arranged at the bottom of described support, from frame bottom, supports described support; The length of the connecting link in described coil is greater than the height of described support; When the base of described inverted T shape structure is connected with described support through the center section of described the first side coil or the second side coil, described coil is realized the setting that the anglec of rotation is 180 degree; When the base of described inverted T shape structure replaces with the base of the type of falling ∏ structure, the described type of falling ∏ base is arranged at bottom or the both sides of described support, from support described in the bottom support of support or from support described in the lateral support of support.
6. the caliberating device of superconducting quantum interference device three axis magnetometer according to claim 1, is characterized in that: described rotating mechanism comprises:
Fixed frame, comprises circular guideway, the stuck-module sliding along described circular guideway being arranged on surface level and the armed lever that supports fixing described circular guideway; Described stuck-module is fixed described cryostat, and drive described cryostat on surface level with Arbitrary Rotation;
Swivel bearing, is arranged on described armed lever, on a vertical plane with arbitrarily angled rotation; Described coil is installed on described swivel bearing, and under the rotation of swivel bearing drives on a vertical plane centered by described superconducting quantum interference device three axis magnetometer with Arbitrary Rotation; Described coil is Helmholtz coils.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104330754A (en) * | 2014-09-29 | 2015-02-04 | 北京美尔斯通科技发展股份有限公司 | Superconducting weak magnetic signal detection magnetometer |
| CN104569884A (en) * | 2013-10-18 | 2015-04-29 | 中国科学院上海微系统与信息技术研究所 | Calibration device and method for SQUID (Superconducting Quantum Interference Device) triaxial magnetometers |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104569884A (en) * | 2013-10-18 | 2015-04-29 | 中国科学院上海微系统与信息技术研究所 | Calibration device and method for SQUID (Superconducting Quantum Interference Device) triaxial magnetometers |
| CN104569884B (en) * | 2013-10-18 | 2017-10-27 | 中国科学院上海微系统与信息技术研究所 | The caliberating device and method of a kind of SPUID three axis magnetometer |
| CN104330754A (en) * | 2014-09-29 | 2015-02-04 | 北京美尔斯通科技发展股份有限公司 | Superconducting weak magnetic signal detection magnetometer |
| CN104330754B (en) * | 2014-09-29 | 2017-09-19 | 北京美尔斯通科技发展股份有限公司 | Superconduction weak magnetic signal detects magnetometer |
| CN104678340A (en) * | 2015-02-27 | 2015-06-03 | 清华大学 | Measuring error correction method and system for magnetometer |
| CN104678340B (en) * | 2015-02-27 | 2017-09-22 | 清华大学 | A kind of magnetometer survey error correction method and system |
| CN106569151A (en) * | 2016-11-09 | 2017-04-19 | 曲靖师范学院 | System for testing electric-field regulation and control magnetic property of material and device under extreme condition |
| CN106569151B (en) * | 2016-11-09 | 2019-04-05 | 曲靖师范学院 | Test material and the system of device electric fields regulation magnetic property under extreme condition |
| CN108387952A (en) * | 2018-02-06 | 2018-08-10 | 吉林大学 | Three-component SQUID sensor intercept means for correctings and bearing calibration |
| CN108387952B (en) * | 2018-02-06 | 2019-09-10 | 吉林大学 | Three-component SQUID sensor intercept means for correcting and bearing calibration |
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