CN109633757A - Eddy current compensation method and eddy current compensation system - Google Patents
Eddy current compensation method and eddy current compensation system Download PDFInfo
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
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Abstract
The present invention provides a kind of eddy current compensation method and eddy current compensation system, comprising: makes the interference in the interference-free source of SQUID system；Pumping signal is applied to the excitation coil of SQUID system peripherals, obtains the output signal of SQUID system；Derivation is carried out to the output signal of SQUID system, obtains transfer function；By emission current and transfer function convolution, the vortex response signal of SQUID system is obtained；The vortex response signal that the output signal of SQUID system is subtracted to SQUID system, obtains the response signal of measurand.Wherein, SQUID system is set on insulating support；Excitation coil is sheathed on the outside of SQUID system, for generating pulsed magnetic field；Arithmetic element is connected to the output end of SQUID system, for carrying out eddy current compensation operation.System transfer function solution mode of the invention is simple, and SQUID has biggish bandwidth, preferable to the response of pulse signal；Not only can be with the vortex of compensation system itself, but also the vortex that aluminium foil is coated around SQUID can be compensated, system stability greatly enhances.
Description
Technical field
The present invention relates to Magnetic testi fields, more particularly to a kind of eddy current compensation method and eddy current compensation system.
Background technique
Superconducting quantum interference device (Superconducting Quantum Interference Device, hereinafter referred to as
It SQUID is) the most sensitive Magnetic Sensor being currently known, wherein low-temperature superconducting SQUID sensitivity is up to 1fT (1fT=10-15It is special
Si La) magnitude, high-temperature superconductor SQUID sensitivity also up to 10fT magnitude, are important high-end applications Magnetic Sensor, are widely applied
In biologic medical, the fields such as geophysical exploration and basic research.
Transient electromagnetic method is using a kind of more one of exploitation method in geophysical exploration, it is based on electrical property difference,
Transmitting double polarity pulse signal simultaneously receive underground response, be mainly used for find low resistance objective, anti-interference ability with higher and
Resolution ratio.
When being detected with transient electromagnetic system, transmitting signal not only excites underground to respond, while also activating system sheet
The vortex of body responds, and interferes to measurement result.Transfer function is obtained by way of deconvolution in the prior art, step is numerous
It is trivial, and the detection accuracy of system is to be improved.Also can there are problems that system vortex response in other electromagnetic testing systems.
Therefore, how to simplify step, improve detection accuracy have become those skilled in the art's urgent problem to be solved it
One.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of eddy current compensation method and vortex
Compensation system, for solve in the prior art electromagnetic surveying complex steps, accuracy is not high the problems such as.
In order to achieve the above objects and other related objects, the present invention provides a kind of eddy current compensation method, the eddy current compensation
Method includes at least:
SQUID system is set, the interference in the interference-free source of SQUID system is made；
Pumping signal is applied to the excitation coil of the SQUID system peripherals, pulsed magnetic field is generated, obtains the SQUID
The output signal of system；
Derivation is carried out to the output signal of the SQUID system, obtains transfer function；
By the emission current for being used to detect and the transfer function convolution, the vortex response letter of the SQUID system is obtained
Number；
The output signal of the SQUID system is subtracted to the vortex response signal of the SQUID system, obtains measurand
Response signal.
Optionally, the pumping signal is step signal.
More optionally, the interference source includes geomagnetic field, industrial frequency noise or metal object.
More optionally, when the periphery cladding Multilayer single conductive metal film of the SQUID system, by the transmitting electricity
Flow the vortex that the vortex response and the single-sided conductive metallic film of the SQUID system are obtained with the transfer function convolution
Response signal；Then by the output signal of the SQUID system subtract the SQUID system vortex response signal and the list
The vortex response signal of face conductive metal film, obtains the response signal of measurand.
More optionally, the eddy current compensation method is suitable for transient electromagnetic system.
In order to achieve the above objects and other related objects, the present invention provides a kind of eddy current compensation system, is based on above-mentioned vortex
Compensation method, the eddy current compensation system include at least:
SQUID system, is set on insulating support, for obtaining the response signal and vortex response signal of measurand；
Excitation coil is sheathed on the outside of the SQUID system, for generating pulsed magnetic field；
Arithmetic element, is connected to the output end of the SQUID system, and receives the emission current for detection, for into
Row eddy current compensation operation.
Optionally, the height of the insulating support is not less than 10m.
More optionally, the material of the insulating support includes timber.
Optionally, the SQUID system includes Dewar, SQUID device and reading circuit, and the SQUID device is soaked in
In refrigerant liquid in the Dewar；The reading circuit is set to outside the Dewar, and passes through conducting wire and the SQUID device
Part connection.
More optionally, the refrigerant liquid includes liquid helium or liquid nitrogen.
More optionally, the Dewar includes Non-magnetic dewar.
More optionally, the eddy current compensation system further includes that the Multilayer single conductive metal that is coated on outside the Dewar is thin
Film.
More optionally, the material of the single-sided conductive metallic film includes aluminium.
As described above, eddy current compensation method and eddy current compensation system of the invention, have the advantages that
Eddy current compensation method and eddy current compensation system of the invention carries out derivation by the output signal to SQUID system,
And then transfer function is obtained, it is simple to solve mode.
Eddy current compensation method and eddy current compensation system of the invention is based on using the response of SQUID induction measurand
The bandwidth of SQUID is larger, also high to the response of pulse signal, is greatly improved the accuracy of system.
Eddy current compensation method and eddy current compensation system of the invention can also both be compensated with the vortex of compensation system itself
The vortex of the Multilayer single conductive metal film of SQUID system peripherals cladding, greatly improves system stability.
Detailed description of the invention
Fig. 1 is shown as the structural schematic diagram of eddy current compensation system of the invention.
Fig. 2 is shown as the flow diagram of eddy current compensation system of the invention.
Fig. 3 is shown as pumping signal, the output signal of SQUID system and convolution solution of the invention returning in one cycle
One changes amplitude schematic diagram.
Fig. 4 is shown as the partial enlargement diagram of Fig. 3 rising edge.
Component label instructions
1 eddy current compensation system
11 insulating supports
12 SQUID systems
121 Dewars
122 SQUID devices
123 reading circuits
13 excitation coils
14 arithmetic elements
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Please refer to FIG. 1 to FIG. 4.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, only shown in schema then with related component in the present invention rather than package count when according to actual implementation
Mesh, shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its
Assembly layout kenel may also be increasingly complex.
Embodiment one
As shown in Figure 1, the present embodiment provides a kind of system 1 for eddy current compensation, the eddy current compensation system 1 includes:
Insulating support 11, SQUID system 12, excitation coil 13 and arithmetic element 14.
As shown in Figure 1, the insulating support 11 is for placing the SQUID system 12.
Specifically, in the present embodiment, the material of the insulating support 11 is timber, in actual use, arbitrarily to quilt
The response for surveying object, which do not have an impact, does not generate the material of vortex is applicable in of the invention, will not repeat them here.The insulation branch
The influence for reducing or avoiding geomagnetic field to detection result, in the present embodiment, the insulation are subject in the height setting of frame 11
The height of bracket is set as not less than 10m, and the height of the insulating support 11 is higher, and influence of the geomagnetic field to detection result is got over
It is small, but cost is higher, highly preferred on the basis of weighing accuracy and cost is 15m, 20m.
As shown in Figure 1, the SQUID system 12 is set on insulating support 11, the response for obtaining measurand is believed
Number and vortex response signal.
Specifically, the SQUID system 12 includes Dewar 121, SQUID device 122 and reading circuit 123.
More specifically, the Dewar 121 is a closed tank body, for storing, transporting cryogenic liquid gas.In this implementation
In example, refrigerant liquid, including but not limited to liquid nitrogen and liquid helium are accommodated in the Dewar 121.In order to avoid the tank of the Dewar 121
The magnetic influence to magnetic field detection of body material, in the present embodiment, the Dewar 121 is preferably Non-magnetic dewar.
More specifically, the SQUID device 122 is soaked in the refrigerant liquid in the Dewar 121, in the present embodiment
In, the SQUID device 122 is SQUID three axis magnetometer, and the environmental magnetic field for detecting three axial directions fluctuates, the SQUID
Device 122 includes three SQUID magnetometers, each SQUID magnetometer be respectively arranged at the front surface of a regular cube, upper surface and
On left surface (three orthogonal surfaces)；Each SQUID magnetic strength is calculated as an annulus, and the SQUID magnetometer is by superconduction material
Material is made, and the magnetometer signal for will test is converted to voltage signal.In practical applications, Magnetic testi arbitrarily can be achieved
SQUID device is suitable for the present invention, is not limited to the present embodiment.
More specifically, the reading circuit 123 is set to outside the Dewar 121, the input terminal of the reading circuit 123
The output end that the SQUID device 122 is connected by conducting wire, the signal detected for reading the SQUID device 122.Appoint
The circuit that achievable SQUID device signal is read of anticipating is suitable for the present invention, numerous to list herein.
As shown in Figure 1, the excitation coil 13 is sheathed on the outside of the SQUID system 12, for generating pulsed magnetic field.
Specifically, the lateral wall of the excitation coil 13 Dewar 121 in the SQUID system 12, can with it is described
The lateral wall of Dewar 121 is bonded, and a fixed spacing can also be kept with the lateral wall of the Dewar 121, not excite the earth to generate
Subject to vortex, specific value does not limit one by one herein.A pulse can be generated after the excitation coil 13 receives pumping signal
Magnetic field.
As shown in Figure 1, the arithmetic element 14 is connected to the output end of the SQUID system 12, and receive for detecting
Emission current, for carrying out eddy current compensation operation.
Specifically, the arithmetic element 14 obtains the output signal of the SQUID system 12 and the transmitting electricity for detection
Stream carries out derivative operation to the output signal of the SQUID system 12 to obtain transfer function, then by the emission current and institute
It states transfer function progress convolution algorithm and obtains system vortex response signal, finally subtract the output signal of the SQUID system 12
It goes the system vortex response signal to obtain the response signal of measurand, realizes eddy current compensation.In the present embodiment, described
Arithmetic element 14 includes derivation module, convolution module and subtraction block (not shown), described in the derivation module receives
The output signal of SQUID system 12, the convolution module connects the output end of the emission current and the derivation module, described
Subtraction block connects the output signal of the SQUID system 12 and the output end of the convolution module.Above-mentioned fortune arbitrarily can be achieved
The circuit structure or software computing module of calculation are suitable for the present invention, will not repeat them here.
As a kind of implementation of the present embodiment, the eddy current compensation system 1 further includes being coated on outside the Dewar 121
The Multilayer single conductive metal film (not shown) in portion.The material of the single-sided conductive metallic film includes but is not limited to
Aluminium, the single-sided conductive metallic film are pasted onto the outer surface of the Dewar 121, for preventing high-frequency signal from interfering, increase system
The stability of system.The number of plies of the single-sided conductive metallic film can be set as needed, in the present embodiment, the Dewar 121
Outer surface paste be not less than 40 layers of single-sided conductive metallic film.
Embodiment two
As shown in Fig. 2, the present invention provides a kind of eddy current compensation method, the eddy current compensation method includes:
1) SQUID system 12 is set, the interference in the interference-free source of the SQUID system 12 is made.
Specifically, in the present embodiment, insulating support 11 is built, the insulating support 11 is set to far from interference source
Place, the interference source include but is not limited to geomagnetic field, industrial frequency noise or metal object.Wherein, by the way that the insulation branch is arranged
The height of frame 11 makes the interference of the SQUID system 12 far from geomagnetic field, passes through what the selection insulating support 11 was arranged
Geographical location makes the SQUID system 12 far from the interference of industrial frequency noise or metal object etc., and industrial frequency noise includes but is not limited to
The electric wire (far from industrial frequency noise to improve signal-to-noise ratio) being set near the insulating support, metal object includes but is not limited to vapour
Vehicle, building (generating eddy current effect far from metal object, avoid influencing convolution results).
It should be noted that the present embodiment is realized based on eddy current compensation system 1 described in embodiment one, in practical application
In, the SQUID system 12 can be set to the place far from interference source by any way, be not limited to cited by the present embodiment
Insulating support 11.
It should be noted that the SQUID device 122 need to by the 123 debugging efforts point of the reading circuit of multichannel,
It can be worked normally after setting up operating point, specific adjustment method will not repeat them here.
2) pumping signal is applied to the excitation coil 13 of 12 periphery of the SQUID system, generates pulsed magnetic field, described in acquisition
The output signal of SQUID system 12.
Specifically, as shown in Figure 1, applying pumping signal to the excitation coil 13, in the present embodiment, the excitation letter
It number is step signal, including but not limited to pulse signal generates pulsed magnetic field with this.In the pulsed magnetic field and tested magnetic field
Under, the SQUID device 122 detects the response signal of measurand and the vortex response signal (two of the SQUID system 12
A response signal mixes), the SQUID system 12 exports corresponding signal.
3) derivation is carried out to the output signal of the SQUID system 12, obtains transfer function.
Specifically, the arithmetic element 14 obtains the output signal of the SQUID system 12, and carries out derivation fortune to this
It calculates, and then obtains the transfer function.Derivative operation step is simple, greatly reduces calculation amount.
4) emission current for being used to detect and the transfer function are subjected to convolution, obtain the whirlpool of the SQUID system 12
Flow response signal.
Specifically, the arithmetic element 14 obtains the emission current and the transfer function, and carries out convolution fortune to this
It calculates, and then obtains the vortex response signal of the SQUID system 12.
5) output signal of the SQUID system 12 is subtracted to the vortex response signal of the SQUID system 12, obtains quilt
Survey the response signal of object.
Specifically, the arithmetic element 14 obtains the output signal and the SQUID system 12 of the SQUID system 12
It is vortexed response signal, by the output signal (response signal and the SQUID system 12 of measurand of the SQUID system 12
Vortex response signal) subtract the vortex response signal of the SQUID system 12, and then obtain the response signal of measurand.
It is illustrated in figure 3 pumping signal, the output signal of SQUID system and the convolution solution obtained using method of the invention
Normalization amplitude in one cycle, wherein the lower half period only has convolution solution (predicted value), is illustrated in figure 4 Fig. 3 rising edge
Enlarged drawing, it is seen then that the output signal of SQUID system is essentially coincided with convolution solution, and measurement accuracy is high.
It should be noted that the eddy current compensation method is suitable for the transient electromagnetic system of geophysical exploration, it is also suitable
In other systems for needing to carry out eddy current compensation, will not repeat them here.
Since the present invention compensates vortex, the response signal of practical measurand can be restored, and then is obtained accurate
Measurement result.
Embodiment three
The present embodiment provides a kind of eddy current compensation methods, the difference is that, the present embodiment also compensates for embodiment two
The vortex of single-sided conductive metallic film.
Specifically, when the 12 periphery cladding Multilayer single conductive metal film of SQUID system: 2) SQUID described in
System 12 detects the response signal of measurand, the vortex response signal of the SQUID system 12 and single-sided conductive gold
Belong to the vortex response signal of film (three response signals mix)；4) what is obtained after convolution algorithm in is the SQUID system
The vortex response signal of the vortex response and the single-sided conductive metallic film of system 12；5) by the defeated of the SQUID system 12 in
Signal subtracts the vortex response signal of the SQUID system 12 and the vortex response signal of the single-sided conductive metallic film out,
Obtain the response signal of measurand.
If as a whole by system, cooperating excitation coil and lazy board, acquire its transfer function, then it can be with base
The eddy current signal excited under different transmitting magnetic fields is obtained in convolution, data processing stage is artificially deducted, and the earth can be obtained
True response.
This technology can be applied in transient electromagnetic system, can eliminate system metal part itself to the shadow of detection result
It rings.The technology also can be applied to other occasions for needing eddy current compensation.
In conclusion the present invention provides a kind of eddy current compensation method and eddy current compensation system, comprising: setting SQUID system,
Make the interference in the interference-free source of SQUID system；Pumping signal is applied to the excitation coil of the SQUID system peripherals, is produced
Raw pulsed magnetic field, obtains the output signal of the SQUID system；Derivation is carried out to the output signal of the SQUID system, is obtained
Transfer function；By the emission current for being used to detect and the transfer function convolution, the vortex response letter of the SQUID system is obtained
Number；The vortex response signal that the output signal of the SQUID system is subtracted to the SQUID system, obtains the sound of measurand
Induction signal.SQUID system is set on insulating support, for obtaining the response signal and vortex response signal of measurand；Swash
The outside that coil is sheathed on the SQUID system is encouraged, for generating pulsed magnetic field；Arithmetic element is connected to the SQUID system
Output end, and receive for detection emission current, for carrying out eddy current compensation operation.Eddy current compensation method of the invention and
Eddy current compensation system carries out derivation by the output signal to SQUID system, and then obtains transfer function, and it is simple to solve mode；
And the present invention, using the response of SQUID induction measurand, the bandwidth based on SQUID is larger, it is also high to the response of pulse signal,
It is greatly improved the accuracy of system；Meanwhile the present invention both can also compensate SQUID system with the vortex of compensation system itself
The vortex of the Multilayer single conductive metal film of system periphery cladding, greatly improves system stability.So the present invention effectively overcomes
Various shortcoming in the prior art and have high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (13)
1. a kind of eddy current compensation method, which is characterized in that the eddy current compensation method includes at least:
SQUID system is set, the interference in the interference-free source of SQUID system is made；
Pumping signal is applied to the excitation coil of the SQUID system peripherals, pulsed magnetic field is generated, obtains the SQUID system
Output signal；
Derivation is carried out to the output signal of the SQUID system, obtains transfer function；
The emission current for being used to detect and the transfer function are subjected to convolution, obtain the vortex response letter of the SQUID system
Number；
The vortex response signal that the output signal of the SQUID system is subtracted to the SQUID system, obtains the sound of measurand
Induction signal.
2. eddy current compensation method according to claim 1, it is characterised in that: the pumping signal is step signal.
3. eddy current compensation method according to claim 1 or 2, it is characterised in that: the interference source includes geomagnetic field, work
Frequency noise or metal object.
4. eddy current compensation method according to claim 1 or 2, it is characterised in that: when the periphery cladding of the SQUID system
When Multilayer single conductive metal film, by the emission current and the transfer function convolution to obtain the SQUID system
The vortex response signal of vortex response and the single-sided conductive metallic film；Then the output signal of the SQUID system is subtracted
The vortex response signal of the SQUID system and the vortex response signal of the single-sided conductive metallic film are gone, obtains tested pair
The response signal of elephant.
5. eddy current compensation method according to claim 1 or 2, it is characterised in that: the eddy current compensation method is suitable for wink
Power transformation magnetic system.
6. a kind of eddy current compensation system, is based on eddy current compensation method as claimed in any one of claims 1 to 5, wherein, feature exists
In the eddy current compensation system includes at least:
SQUID system, is set on insulating support, for obtaining the response signal and vortex response signal of measurand；
Excitation coil is sheathed on the outside of the SQUID system, for generating pulsed magnetic field；
Arithmetic element is connected to the output end of the SQUID system, and receives the emission current for detection, for carrying out whirlpool
Flow compensation operation.
7. eddy current compensation system according to claim 6, it is characterised in that: the height of the insulating support is not less than 10m.
8. eddy current compensation system according to claim 6, it is characterised in that: the material of the insulating support includes timber.
9. eddy current compensation system according to claim 6, it is characterised in that: the SQUID system includes Dewar, SQUID
Device and reading circuit；The SQUID device is soaked in the refrigerant liquid in the Dewar；The reading circuit is set to institute
It states outside Dewar, and is connect by conducting wire with the SQUID device.
10. eddy current compensation system according to claim 9, it is characterised in that: the refrigerant liquid includes liquid helium or liquid nitrogen.
11. eddy current compensation system according to claim 9, it is characterised in that: the Dewar includes Non-magnetic dewar.
12. according to eddy current compensation system described in claim 6~11 any one, it is characterised in that: the eddy current compensation system
System further includes the Multilayer single conductive metal film being coated on outside the Dewar.
13. eddy current compensation system according to claim 12, it is characterised in that: the material of the single-sided conductive metallic film
Including aluminium.
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| CN114137065A (en) * | 2021-11-18 | 2022-03-04 | 中国人民解放军国防科技大学 | Metal crack/stress gradient detection sensor and application method thereof |
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| CN111462975A (en) * | 2020-03-31 | 2020-07-28 | 清华大学 | Magnetic field generation method, synchrotron, storage medium and equipment |
| CN111462975B (en) * | 2020-03-31 | 2021-05-18 | 清华大学 | Magnetic field generation method, synchrotron, storage medium and equipment |
| CN114137065A (en) * | 2021-11-18 | 2022-03-04 | 中国人民解放军国防科技大学 | Metal crack/stress gradient detection sensor and application method thereof |
| CN114137065B (en) * | 2021-11-18 | 2023-12-26 | 中国人民解放军国防科技大学 | Metal crack/stress gradient detection sensor and application method thereof |
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