CN113960505A - Mutual interference suppression method for multi-sensor cooperative measurement and storage medium - Google Patents
Mutual interference suppression method for multi-sensor cooperative measurement and storage medium Download PDFInfo
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Abstract
The invention discloses a mutual interference suppression method for multi-sensor cooperative measurement and a storage medium, which are realized based on an integrated fusion type magnetic sensor and comprise three magnetic induction units: the system comprises an Overhauser scalar magnetic field measuring unit, a fluxgate measuring unit and a TMR measuring unit; the method can solve the problem of mutual compatibility of synchronous and in-phase operation of different types of magnetic sensors in a small space range. By using a common-frequency feedback mechanism and a coil-free magnetic core structure, the spatial electromagnetic information coupling caused by an excitation process and an induction process of the vector sensor and the scalar sensor is effectively improved, so that the magnetic sensors with different structures can work in a compatible mode, and the integration level of the mutual cooperation of multiple types of magnetic sensors is effectively improved. The method can realize the miniaturization of the existing multi-class magnetic sensor measuring system and improve the comprehensive application precision of the system so as to meet the requirements of the fields of deep space, deep sea and the like on the weak magnetic detection method and instrument.
Description
Technical Field
The invention relates to the field of sensor cooperative measurement, in particular to a mutual interference suppression method and a storage medium for multi-sensor cooperative measurement.
Background
The magnetic field is one of the basic physical fields of the earth, can reflect the material composition distribution and the geological structure information in the earth, generally takes the earth magnetic field as a boundary, and is a weak magnetic field below the boundary. The development of the weak magnetic measuring instrument has important research value in the traditional fields of the geophysical field, the space magnetic measurement and the like. According to the mature magnetic measurement method and working principle, various magnetic sensors are developed in succession, wherein the magnetic sensors are widely applied to the field of weak magnetic measurement and comprise a fluxgate measurement unit, an inductive magnetic sensor, a superconducting quantum interferometer sensor, an optical pumping sensor, a resonance sensor, a magnetometer and the like.
The magnetic sensors based on different magnetic measurement principles and methods have obvious differences in the aspects of internal frames, circuit structures, signal characteristics and the like, so that the problem of complex mutual interference exists when multiple magnetic sensors or magnetic sensing units are applied to the same system. At present, considerable results have been obtained in the related research on the interference of a single magnetic sensor, and the characteristic analysis and suppression method for common interference can be applied to practice. However, in the problem of mutual interference between magnetic sensors, especially for different magnetic sensors, related research on mutual interference characteristic analysis and suppression methods has not been intensively carried out.
Disclosure of Invention
The invention mainly aims to analyze the mutual interference characteristics among different magnetic sensors and effectively inhibit the mutual interference characteristics.
In order to achieve the above object, the present invention provides a mutual interference suppression method for multi-sensor cooperative measurement, based on an integrated fusion magnetic sensor, which includes three magnetic sensing units: the system comprises an Overhauser scalar magnetic field measuring unit, a fluxgate measuring unit and a TMR measuring unit;
the mutual interference suppression method for the multi-sensor cooperative measurement comprises the following steps:
s1, calculating a safety distance between each magnetic induction unit, and arranging the position of each magnetic induction unit through the safety distance to eliminate interference caused by each magnetic sensitive material;
s2, constructing a no-coil fluxgate structure to eliminate mutual inductance interference of coils of the fluxgate measuring unit and mutual coupling interference between the fluxgate measuring unit and the Overhauser scalar magnetic field measuring unit;
s3, directly exciting the fluxgate measurement unit and the TMR measurement unit by using Larmor signals, further eliminating mutual interference of different excitation signals and inhibiting excitation noise;
according to the steps S1-S3, mutual interference suppression among the three magnetic induction units is completed.
Further, the step of calculating a safety distance between the magnetic induction units and arranging the positions of the magnetic induction units according to the safety distance specifically includes:
analyzing the characteristics of coil materials, magnetic core materials and thin film materials of an Overhauser scalar magnetic field measuring unit, a fluxgate measuring unit and a TMR measuring unit to obtain a magnetic induction characteristic distribution field of each magnetic induction unit;
and calculating a safety distance between the magnetic induction units according to the magnetic induction characteristic distribution fields, and arranging the positions of the magnetic induction units according to the safety distance so as to eliminate mutual interference among the magnetic sensitive materials caused by the sensor framework, the magnetic core of the fluxgate measurement unit part and the multiple ferromagnetic layers of the TMR measurement unit part.
Further, after the step of calculating a safety distance between the magnetic induction units and arranging positions of the magnetic induction units by the safety distance, the method further includes:
and calculating the attenuation ratio constant of the magnetic field of the material among the magnetic induction units, and selecting the material meeting the attenuation ratio constant as the base material of the integrated fusion type magnetic sensor so as to remove the magnetic interference of the base material.
Further, the step of calculating an attenuation ratio constant of the material magnetic field between each magnetic induction unit, and selecting a material satisfying the attenuation ratio constant as a base material of the integrated fusion type magnetic sensor to remove magnetic interference of the base material specifically includes:
analyzing the characteristics of coil materials, magnetic core materials and thin film materials of an Overhauser scalar magnetic field measuring unit, a fluxgate measuring unit and a TMR measuring unit to obtain a magnetic induction characteristic distribution field of each magnetic induction unit;
analyzing magnetic core parameters, power loss under rotary magnetization and magnetic core or thin film layer magnetic field distribution characteristics according to the magnetic induction characteristic distribution field of each magnetic induction unit to obtain an attenuation ratio constant of a material magnetic field between the magnetic induction units;
and selecting a non-magnetic substance as a substrate material of the integrated magnetic sensor according to the attenuation ratio constant, and removing the magnetic interference of the substrate material.
Further, the step of constructing the structure of the fluxgate without the coil specifically includes:
analyzing the magnetic core low-frequency impedance effect of the fluxgate measurement unit, and constructing a no-coil fluxgate structure based on the cobalt-based amorphous wire low-frequency impedance effect;
the excitation signal directly excites the cobalt-based amorphous wire, and mutual interference of coils is avoided, so that mutual inductance interference of coils of the fluxgate measurement unit and mutual coupling interference between the fluxgate measurement unit and the Overhauser scalar magnetic field measurement unit are eliminated.
Further, the step of directly exciting the fluxgate measuring unit and the TMR measuring unit by using larmor signal specifically includes:
exciting the Overhauser scalar magnetic field measurement unit by adopting NMR & DNP (double resonance method based on nuclear magnetic resonance and dynamic nuclear polarization) as an excitation source;
and the Larmor signal output by the Overhauser scalar magnetic field measuring unit is used for exciting the fluxgate measuring unit and the TMR measuring unit, so that the mutual interference of different excitation signals is eliminated, and the excitation noise is suppressed.
In addition, in order to achieve the above object, the present invention further provides a storage medium, where the storage medium is a computer-readable storage medium, and the mutual interference suppression method for multi-sensor cooperative measurement is stored in the computer-readable storage medium.
The technical scheme provided by the invention has the beneficial effects that:
the problem of mutual compatibility of synchronous and in-phase work of different types of magnetic sensors in a small space range is solved. By using a common-frequency feedback mechanism and a coil-free magnetic core structure, the spatial electromagnetic information coupling caused by an excitation process and an induction process of the vector sensor and the scalar sensor is effectively improved, so that the magnetic sensors with different structures can work in a compatible mode, and the integration level of the mutual cooperation of multiple types of magnetic sensors is effectively improved. The method can realize the miniaturization of the existing multi-class magnetic sensor measuring system and improve the comprehensive application precision of the system so as to meet the requirements of the fields of deep space, deep sea and the like on the weak magnetic detection method and instrument.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a flowchart of a mutual interference suppression method for multi-sensor cooperative measurement according to an embodiment of the present invention;
FIG. 2 is a flow chart of the magnetic sensitive material mutual interference suppression according to the embodiment of the present invention;
FIG. 3 is a flow chart of coil mutual coupling interference suppression according to an embodiment of the present invention;
fig. 4 is a flow chart of excitation signal cross-talk suppression according to the present invention.
Detailed Description
Various exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The embodiment provides a mutual interference suppression method for multi-sensor cooperative measurement, which is realized based on an integrated fusion type magnetic sensor and comprises three magnetic induction units: the system comprises an Overhauser scalar magnetic field measuring unit, a fluxgate measuring unit and a TMR measuring unit;
due to the requirement of high polarization efficiency of dynamic nuclear polarization of the Overhauser magnetic induction unit, a coaxial resonant cavity is designed in the embodiment. A coaxial central cavity is formed in the coaxial resonant cavity, and during measurement, an alternating magnetic field is generated in the cavity by a nuclear magnetic resonance signal. The three magnetic induction units are located at the same position in space, so that the magnetic field measured by the three magnetic induction units is the same, the transformation error in a fusion model is reduced, the fluxgate unit and the TMR magnetic resistance unit are arranged in the coaxial central cavity, and through the structure, various magnetic induction units are effectively and organically fused, so that the advantage complementation is realized.
The electromagnetic interference generated by the construction material of each magnetic induction unit and the measurement process can cause certain influence on the measurement process of other magnetic induction units. Therefore, it is necessary to specify a suppression strategy for interferences and noises such as mutual interference of magnetosensitive materials, mutual coupling of coils, mutual excitation interference and the like, which are unique among different magnetosensitive units in the fusion magnetic sensor, so as to improve the performance such as the measurement accuracy of the fusion magnetic sensor as much as possible, thereby determining the design conditions of the integrated physical model.
Referring to fig. 1, a mutual interference suppression method for multi-sensor cooperative measurement includes the following steps:
s1, calculating a safety distance between each magnetic induction unit, and arranging the position of each magnetic induction unit through the safety distance to eliminate interference caused by each magnetic sensitive material; calculating attenuation ratio constants of material magnetic fields among the magnetic sensing units, and selecting a base material of the integrated fusion magnetic sensor according to the attenuation ratio constants so as to remove magnetic interference of the base material;
s2, constructing a no-coil fluxgate structure based on a cobalt-based amorphous wire low-frequency impedance effect to eliminate mutual inductance interference of coils of the fluxgate measuring unit and mutual coupling interference between the fluxgate measuring unit and the Overhauser scalar magnetic field measuring unit;
s3, directly exciting the fluxgate measurement unit and the TMR measurement unit by using Larmor signals, further eliminating mutual interference of different excitation signals and inhibiting excitation noise;
according to the steps S1-S3, mutual interference suppression among the three magnetic induction units is completed.
Referring to fig. 2, S1 specifically includes:
s11, analyzing characteristics of coil materials, magnetic core materials and thin film materials of the Overhauser scalar magnetic field measuring unit, the fluxgate measuring unit and the TMR measuring unit to obtain magnetic induction characteristic distribution fields of the magnetic induction units;
s12, calculating the safe measurement distance between the magnetic induction units according to the magnetic induction characteristic distribution field, and designing the safe distance of material magnetic interference between the magnetic induction units, for example, the safe distance between the magnetic core of the fluxgate unit and the core component of the Overhauser unit needs to be more than or equal to 10cm, thereby solving the mutual interference between the magnetic induction materials caused by the sensor framework, the magnetic core of the fluxgate part, the TMR part multi-ferromagnetic layer and the like;
s13, analyzing magnetic core parameters, power loss under rotary magnetization and magnetic core or film layer magnetic field distribution characteristics according to magnetic induction characteristic distribution fields of the magnetic induction units to obtain magnetic field attenuation ratio constants of materials among the magnetic induction units, wherein the magnetic field attenuation ratio constants are obtained through software simulation;
and S14, selecting non-magnetic substances such as polyester plastics, titanium and the like as the materials of the components such as the shape, the framework and the like of the magnetic sensor according to the attenuation ratio constant, and removing the magnetic interference of the substrate material.
Referring to fig. 3, step S2 specifically includes:
s21, analyzing the mutual inductance phenomenon between an exciting coil and an induction coil of the fluxgate measurement unit; the mutual coupling phenomenon between an excitation coil and an induction coil of the fluxgate measurement unit and a radio frequency excitation coil and a Larmor induction coil of the Overhauser scalar magnetic field measurement unit;
s22, analyzing a magnetic core low-frequency impedance effect of a fluxgate measurement unit, constructing a no-loop fluxgate structure based on the cobalt-based amorphous wire low-frequency impedance effect, exciting a sensing element of the no-loop fluxgate structure cobalt-based amorphous wire by a Larmor signal output by an Overhauser unit, and controlling the voltage and current amplitude of an amorphous wire end by adjusting the size of a resistor in a mode of adding the resistor in series with the amorphous wire so as to control the amorphous wire under the optimal working condition; meanwhile, the switch of the analog switch is controlled by a pulse excitation signal (Larmor signal) which is in the same phase and time with amorphous wire pulse excitation so as to achieve the effect of synchronous detection, and the analog switch has high temperature stability, can keep the stability of output under long-time work and prevents the temperature drift phenomenon.
S23, the amorphous wire is directly excited by the excitation signal without mutual interference of coils, and the problems of mutual inductance interference of the coils of the fluxgate unit and mutual coupling interference between the fluxgate unit and the Overhauser unit are solved from the source;
referring to fig. 4, step S3 specifically includes:
s31, analyzing the excitation field characteristics of the three magnetic induction units, and constructing an interference field model of the excitation field combined by the three magnetic induction units in the center of the sensor;
s32, simulating and analyzing the influence of the excitation field of each magnetic induction unit on the magnetization degree, proton phase and energy level of the magnetic core and the thin film of the sensor;
s33, based on the influence of the magnetization degree, proton phase and energy level of the magnetic core and the film of the sensor, a method for suppressing the noise of the fusion type magnetic sensor based on the same-frequency excitation is provided, the Larmor signal output by the Overhauser scalar magnetic field measuring unit is directly used as the excitation source of the fluxgate measuring unit and the TMR measuring unit to work,
s34, only the excitation source of the Overhauser scalar magnetic field measuring unit needs to be designed, a double resonance method based on nuclear magnetic resonance and dynamic nuclear polarization is adopted, then the Larmor signal output by the Overhauser scalar magnetic field measuring unit is used for exciting the fluxgate measuring unit and the TMR sensor, mutual interference of different excitation signals is solved from the source, and excitation noise is effectively suppressed.
The embodiment discloses a mutual interference suppression method for multi-sensor cooperative measurement, which is realized based on an integrated fusion type magnetic sensor and can solve the problem of mutual compatibility of synchronous and in-phase work of different types of magnetic sensors in a small space range. By using a common-frequency feedback mechanism and a coil-free magnetic core structure, the spatial electromagnetic information coupling caused by an excitation process and an induction process of the vector sensor and the scalar sensor is effectively improved, so that the magnetic sensors with different structures can work in a compatible mode, and the integration level of the mutual cooperation of multiple types of magnetic sensors is effectively improved. The method can realize the miniaturization of the existing multi-class magnetic sensor measuring system and improve the comprehensive application precision of the system so as to meet the requirements of the fields of deep space, deep sea and the like on the weak magnetic detection method and instrument.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third and the like do not denote any order, but rather the words first, second and the like may be interpreted as indicating any order.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. The mutual interference suppression method for the multi-sensor cooperative measurement is characterized by being realized based on an integrated fusion magnetic sensor, wherein the integrated fusion magnetic sensor comprises three magnetic induction units: the system comprises an Overhauser scalar magnetic field measuring unit, a fluxgate measuring unit and a TMR measuring unit;
the mutual interference suppression method for the multi-sensor cooperative measurement comprises the following steps:
s1, calculating a safety distance between each magnetic induction unit, and arranging the position of each magnetic induction unit through the safety distance to eliminate interference caused by each magnetic sensitive material;
s2, constructing a no-coil fluxgate structure to eliminate mutual inductance interference of coils of the fluxgate measuring unit and mutual coupling interference between the fluxgate measuring unit and the Overhauser scalar magnetic field measuring unit;
s3, directly exciting the fluxgate measurement unit and the TMR measurement unit by using Larmor signals to eliminate mutual interference of different excitation signals and suppress excitation noise;
according to the steps S1-S3, mutual interference suppression among the three magnetic induction units is completed.
2. The mutual interference suppression method for multi-sensor cooperative measurement according to claim 1, wherein the step of calculating a safety distance between the magnetic induction units and arranging the positions of the magnetic induction units by the safety distance specifically includes:
analyzing the characteristics of the coil materials, the magnetic core materials and the thin film materials of the Overhauser scalar magnetic field measuring unit, the fluxgate measuring unit and the TMR measuring unit to obtain the magnetic induction characteristic distribution field of each magnetic induction unit;
and calculating a safety distance between the magnetic induction units according to the magnetic induction characteristic distribution fields, and arranging the positions of the magnetic induction units according to the safety distance so as to eliminate mutual interference among the magnetic sensitive materials caused by the sensor framework, the magnetic core of the fluxgate measurement unit part and the multiple ferromagnetic layers of the TMR measurement unit part.
3. The mutual interference suppression method for multi-sensor cooperative measurement according to claim 1, wherein after the step of calculating a safety distance between the magnetic induction units and arranging positions of the magnetic induction units by the safety distance, the method further comprises:
and calculating the attenuation ratio constant of the magnetic field of the material among the magnetic induction units, and selecting the material meeting the attenuation ratio constant as the substrate material of the integrated fusion type magnetic sensor so as to remove the magnetic interference of the substrate material.
4. The mutual interference suppression method for the multi-sensor cooperative measurement according to claim 3, wherein the step of calculating an attenuation ratio constant of the material magnetic field between the magnetic sensing units and selecting the substrate material of the integrated fusion type magnetic sensor according to the attenuation ratio constant to remove the magnetic interference of the substrate material specifically comprises:
analyzing the characteristics of coil materials, magnetic core materials and thin film materials of an Overhauser scalar magnetic field measuring unit, a fluxgate measuring unit and a TMR measuring unit to obtain a magnetic induction characteristic distribution field of each magnetic induction unit;
analyzing magnetic core parameters, power loss under rotary magnetization and magnetic core or thin film layer magnetic field distribution characteristics according to the magnetic induction characteristic distribution field of each magnetic induction unit to obtain an attenuation ratio constant of a material magnetic field between the magnetic induction units;
and selecting a non-magnetic substance as a substrate material of the integrated magnetic sensor according to the attenuation ratio constant, and removing the magnetic interference of the substrate material.
5. The mutual interference suppression method for multi-sensor cooperative measurement according to claim 1, wherein the step of constructing a fluxgate structure without a coil specifically includes:
analyzing the magnetic core low-frequency impedance effect of the fluxgate measurement unit, and constructing a no-coil fluxgate structure based on the cobalt-based amorphous wire low-frequency impedance effect;
the excitation signal directly excites the cobalt-based amorphous wire, and mutual interference of coils is avoided, so that mutual inductance interference of coils of the fluxgate measurement unit and mutual coupling interference between the fluxgate measurement unit and the Overhauser scalar magnetic field measurement unit are eliminated.
6. The method for suppressing mutual interference in multi-sensor cooperative measurement according to claim 1, wherein the step of directly exciting the fluxgate measuring unit and the TMR measuring unit by using larmor signal specifically comprises:
exciting the Overhauser scalar magnetic field measurement unit by adopting a double resonance method based on nuclear magnetic resonance and dynamic nuclear polarization;
and the Larmor signal output by the Overhauser scalar magnetic field measuring unit is used for exciting the fluxgate measuring unit and the TMR measuring unit, so that the mutual interference of different excitation signals is eliminated, and the excitation noise is suppressed.
7. A storage medium, wherein the storage medium is a computer-readable storage medium, and the mutual interference suppression method for multi-sensor cooperative measurement according to any one of claims 1 to 6 is stored in the computer-readable storage medium.
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| 鲍丙豪等: "基于非晶丝低频磁阻抗效应的无圈磁通门传感器", 《仪表技术与传感器》 * |
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