CN113484807B - Nested annular triaxial fluxgate sensor detection probe - Google Patents
Nested annular triaxial fluxgate sensor detection probe Download PDFInfo
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- CN113484807B CN113484807B CN202110736721.9A CN202110736721A CN113484807B CN 113484807 B CN113484807 B CN 113484807B CN 202110736721 A CN202110736721 A CN 202110736721A CN 113484807 B CN113484807 B CN 113484807B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/04—Measuring direction or magnitude of magnetic fields or magnetic flux using the flux-gate principle
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Abstract
The invention discloses a nested annular three-axis fluxgate sensor detection probe, which comprises an annular excitation winding framework, wherein the annular excitation winding framework comprises three annular frameworks which are mutually orthogonally arranged along three axial directions of a three-dimensional coordinate system XYZ, permalloy magnetic cores are respectively wound on the three frameworks, and the three annular frameworks are mutually embedded; an excitation winding is wound on the outer annular framework; the square induction winding framework comprises three square frameworks which are mutually orthogonally arranged along three axial directions of a three-dimensional coordinate system XYZ, and the three square frameworks and the annular excitation winding framework are mutually embedded and inserted; the annular excitation winding framework and the square induction winding framework are coaxial in triaxial, and the annular framework is nested in the square framework; the square skeleton on the outer layer is wound with induction winding. The special structure of the annular framework can uniformly distribute the internal stress of the magnetic core, and meanwhile, the magnetic circuit of the annular magnetic core can remove partial region noise. The grooves are designed in each independent framework for splicing and nesting, so that the installation angle deviation is greatly reduced compared with three independent single shafts.
Description
Technical Field
The invention belongs to the technical field of magnetic field detection of fluxgates, and relates to a nested annular triaxial fluxgate sensor detection probe.
Background
The magnetic flux gate sensor is a transformer device modified according to electromagnetic induction phenomenon, except that the transformer effect is used for modulating the external magnetic field to be measured, the basic principle can be explained by Faraday's law of electromagnetic induction, and the magnetic flux gate sensor measures the weak magnetic field by utilizing the nonlinear relation between the magnetic induction intensity and the magnetic field intensity of a high-permeability magnetic core in the magnetic field to be measured under the saturated excitation of an alternating magnetic field. This physical phenomenon appears to the measured ambient magnetic field as a "gate" through which the corresponding magnetic flux is modulated and induced electromotive force is generated.
Existing detection probes based on fluxgate sensors are divided into single-rod type, double-rod type, annular and the like. The magnetic flux gate signal output by the induction coil of the single-rod type magnetic flux gate probe is very weak and the noise signal of odd harmonics can be very large; the dual-rod type fluxgate probe can effectively reduce the noise; however, the magnetic circuit of the exciting coil of the annular fluxgate probe is closed, the magnetic circuit of the induction coil is unique, the symmetry and the structural balance are good, and the stress born by the magnetic core is uniformly distributed, so that compared with single-rod type and double-rod type fluxgate probes, the annular fluxgate probe has smaller noise, and the three-axis annular fluxgate probe is designed to be used for accurately detecting the three-dimensional space magnetic field.
Currently, detection probes adopted by a fluxgate detection magnetic field are mainly single-axis and double-axis, but some cases of a three-axis fluxgate sensor detection probe exist, for example, two patent inventions with patent numbers of CN106405453A and CN106569154A are both named as a three-axis fluxgate sensor. Both patents share the common point with the present invention that the three-axis fluxgate probes used to detect the magnetic field are each composed of three single-axis fluxgate probes, but the disadvantage of both of these two patent inventions is that their three single-axis fluxgate probes are manually mounted on the same plane or same cube, which makes the three-axis magnetic field detection of the related invention have a great human error.
For example, the patent number of CN102928885A, the patent number of the invention of a spherical feedback three-component fluxgate magnetic gradient full tensor probe, and the patent number of CN107271933a, the patent number of the invention of a spherical three-axis fluxgate sensor, are the common point of the two inventions and the invention is that the three-axis fluxgate probe used for detecting the magnetic field is a combination, but the two inventions have the defects that the windings of the two inventions are wound in a plurality of grooves opened on the surface of the sphere to form enamelled copper wires, and because the coils are wound in a plurality of turns in each groove, inter-turn and cable bypass capacitors exist, and the winding among the coils is not ideal laminated and tiled, which causes the induction pulse acquired by the three-axis detection winding to be non-ideal, and reduces the accuracy of magnetic measurement.
As can be seen from comparing the above patents, a magnetic flux gate magnetic field detection technology is needed for a three-axis annular magnetic flux gate probe, which has the advantages of lower noise, more accurate detection precision, smaller size, convenient operation and convenient adjustment.
Disclosure of Invention
The invention aims to provide a triaxial fluxgate sensor detection probe which can reduce magnetic core noise and improve detection stability and accuracy; the annular excitation coil with the magnetic core can uniformly distribute stress born by the magnetic core, and the magnetic circuit of the excitation coil is closed, so that the noise problem generated by the excitation coil is greatly reduced; meanwhile, the detection probe is easy to manufacture, convenient to operate and convenient to adjust, the coil is uniformly wound and is not limited by groove separation, and the generated magnetic field is simpler and more uniform.
The invention aims at realizing the following technical scheme:
the nested annular triaxial fluxgate sensor detection probe comprises an excitation coil part and an induction coil part, wherein the excitation coil comprises a permalloy Bao Tiaozhuang magnetic core, an annular excitation winding framework and an excitation winding, and the induction coil comprises a square induction winding framework and an induction winding;
the annular excitation winding framework comprises an outer annular framework, an intermediate annular framework and an inner annular framework, the three annular frameworks are respectively and mutually orthogonally arranged along the X axis, the Y axis and the Z axis of the three-dimensional coordinate system, square embedding protrusions are respectively arranged on the outer annular of each annular framework at the axial positions of the annular frameworks, and square grooves are respectively arranged on the outer annular framework and the intermediate annular framework at the corresponding positions of the inner annular of the annular frameworks for mutually embedding and arranging the inner annular frameworks and the outer annular frameworks; bonding and winding permalloy thin strip-shaped magnetic cores at peripheral grooves of the outer annular framework, the middle annular framework and the inner annular framework to form an annular framework with the magnetic cores; the excitation winding is uniformly wound on the outer annular framework to form an excitation coil;
the square induction winding framework comprises an outer square framework, a middle square framework and an inner square framework, the three square frameworks are respectively and mutually orthogonally arranged along the X axis, the Y axis and the Z axis of the three-dimensional coordinate system, and square grooves are formed in corresponding positions of the inner sides of the outer square framework and the middle square framework and are used for mutually nesting and arranging the inner square framework and the outer square framework; the annular excitation winding framework and the square induction winding framework are coaxial in triaxial; a square groove is arranged at a corresponding position on the inner side of the inner square framework and is used for being nested with a square embedding protrusion arranged on the outer circle of the outer annular framework; the induction winding is uniformly wound in the groove at the periphery of the outer square skeleton to form an induction coil.
Further, the diameter of the outer annular framework is 20-30 mm, the length and width of the axial embedded convex part are respectively 1-5 mm, and the thickness is 0.5-1 mm; the diameter of the annular skeleton of the middle layer is 10 mm-20 mm, the length and width of the axial embedded convex part are 1 mm-5 mm and the thickness is 0.5 mm-1 mm respectively; the diameter of the inner annular framework is 5 mm-10 mm; all frameworks can be 3D printed by photosensitive resin materials and can also be made of ceramic fiber materials.
Further, four clamping grooves with the width of 0.5-1 mm and the length of 3.5-7 mm are respectively reserved at the inner circular positions of the outer annular framework and the middle annular framework and are used for fixing the annular framework of the next stage.
Further, the magnetic core is a permalloy magnetic strip with the width of 3 mm-10 mm and the thickness of 0.1 mm-0.3 mm, and the magnetic strip is uniformly wound for two circles around the grooves on the outer sides of the three annular frameworks and is used as an excitation coil magnetic core of the detection probe.
Further, the inner side of the middle layer square framework is square with the length and width of 30 mm-35 mm; the inner side of the outer square framework is square with the length and width of 35 mm-40 mm; the outer side of the outer square framework is square with the length and width of 40 mm-45 mm; all frameworks can be 3D printed by photosensitive resin materials and can also be made of ceramic fiber materials.
Four clamping grooves with the width of 1 mm-2 mm, the length of 10 mm-20 mm and the thickness of 0.5 mm-1 mm are reserved on the inner sides of the outer square framework, the middle square framework and the inner square framework respectively and are used for fixing the next square framework.
Furthermore, the induction winding or the excitation winding is made of enamelled copper wires, and 200-800 turns of enamelled copper wires are wound to form an induction coil or an excitation coil.
The excitation circuit is formed by mutually orthogonal three annular fluxgate coils, so that the noise of magnetic field detection is reduced, and the detection precision is improved; each coil is uniformly wound, so that the magnetic field generated by the coils has higher uniformity, and the accuracy and stability of probe detection are improved.
Drawings
FIG. 1 is a three-dimensional block diagram of the present invention;
FIG. 2 is a view of the invention with the front outer box broken away;
FIG. 3 is an exploded view of the present invention;
FIG. 4 is a block diagram of the present invention with a wound coil;
fig. 5 is a diagram of a toroidal core skeleton with wound coils in accordance with the present invention.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
As shown in fig. 1 to 5, the present invention comprises an exciting coil part and an induction coil part, wherein the exciting coil part comprises a permalloy Bao Tiaozhuang magnetic core 3, an annular exciting winding skeleton 2 and an exciting winding 7, the induction coil part comprises a square induction winding skeleton 1 and an induction winding 6, the exciting winding 7 is uniformly wound through a round hole in the middle of the annular skeleton, and the induction winding 6 is uniformly wound in a groove at the periphery of the square skeleton.
As a further aspect of the present invention, as shown in fig. 4 and 5, in order to make the magnetic field generated by the excitation signal and the induced magnetic field in the same horizontal direction, the induction coil is formed by winding the wire around the winding groove on the outer side of the induction bobbin 1, and the excitation coil is formed by winding the wire around the outer annular bobbin 21 of the annular excitation bobbin 2.
As a further aspect of the present invention, as shown in fig. 3, the outer annular skeleton 21 has an inner diameter of 20mm and an outer diameter of 24mm; the length of the axial embedded convex part is 2mm, the width is 1.5mm, and the thickness is 1mm; the inner circle diameter of the middle layer annular skeleton 22 is 14mm, and the outer circle diameter is 18mm; the axial embedding convex 5 is 2mm long, 1.1mm wide and 1mm thick; the inner circle diameter of the inner annular skeleton 23 is 8mm, and the outer circle diameter is 12mm; all of the skeletons can be 3D printed from the photosensitive resin material.
As a further scheme of the present invention, as shown in fig. 3, the inner side of the outer square skeleton 11 is square with length and width of 37mm, and the outer side is square with length and width of 42 mm; the inner side of the middle-layer square framework 12 is square with the length and width of 31mm, and the outer side of the middle-layer square framework is rectangular with the length and width of 38mm and 36 mm; the inner side of the inner square framework 13 is square with the length and width of 26mm, and the outer side is rectangular with the length and width of 32mm and 30 mm; all of the skeletons can be 3D printed from the photosensitive resin material.
As a further scheme of the invention, as shown in FIG. 3, all the frames wound with the magnetic cores and the wires are sequentially inserted, the convex part of the inner annular frame 23 is aligned with the clamping groove 4 of the middle annular frame 22 to be inserted, then the convex part of the middle annular frame 22 is aligned with the clamping groove 4 of the outer annular frame 21 to be inserted, then the convex part of the outer annular frame 21 is aligned with the clamping groove 4 of the inner square frame 13 to be inserted, then the long side of the inner square frame 13 is aligned with the clamping groove 4 of the middle square frame 12 to be inserted, and finally the long side of the middle square frame 12 is aligned with the clamping groove 4 of the outer square frame 11 to be inserted, thus the triaxial annular fluxgate sensor probe assembly is obtained.
As a further scheme of the present invention, as shown in fig. 1 and 2, each layer of embedded skeleton is inserted in the middle of one layer of skeleton clamping groove 4 outside, so that the square skeleton on the outer side corresponds to the annular skeleton on the inner side one by one in the magnetic field direction.
The working principle and the process of the invention are as follows:
the exciting coil wound on the annular skeleton is excited by square wave voltage with a certain frequency, so that the permeability of the permalloy magnetic core is in a magnetic saturation state under an alternating magnetic field, and the nonlinear relation between the magnetic induction intensity and the magnetic field intensity is used for measuring the weak magnetic field. This physical phenomenon appears to the measured ambient magnetic field as a "gate" through which the corresponding magnetic flux is modulated and induced electromotive force is generated. As shown in fig. 1, the inner annular skeleton 23 and the outer square skeleton 11 constitute a single-axis fluxgate sensor probe for detecting the X-axis direction, the outer annular skeleton 21 and the middle square skeleton 12 constitute a single-axis fluxgate sensor probe for detecting the Y-axis direction, and the middle annular skeleton 22 and the inner square skeleton 13 constitute a single-axis fluxgate sensor probe for detecting the Z-axis direction; the three groups of probes are subjected to software programming processing of corresponding algorithms, so that the size and the direction of the environmental magnetic field can be accurately detected.
The specific embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (7)
1. The utility model provides a nested annular triaxial fluxgate sensor test probe, includes excitation coil part and induction coil part, and wherein excitation coil part includes permalloy Bao Tiaozhuang magnetic core, annular excitation wire skeleton and excitation wire, and induction coil part includes square induction wire skeleton and induction wire, its characterized in that:
the annular excitation winding framework comprises an outer annular framework, an intermediate annular framework and an inner annular framework, the three annular frameworks are respectively and mutually orthogonally arranged along the X axis, the Y axis and the Z axis of the three-dimensional coordinate system, square embedding protrusions are respectively arranged on the outer annular of each annular framework at the axial positions of the annular frameworks, and square grooves are respectively arranged on the outer annular framework and the intermediate annular framework at the corresponding positions of the inner annular of the annular frameworks for mutually embedding and arranging the inner annular frameworks and the outer annular frameworks; bonding and winding permalloy thin strip-shaped magnetic cores at peripheral grooves of the outer annular framework, the middle annular framework and the inner annular framework to form an annular framework with the magnetic cores; the excitation winding is uniformly wound on the outer annular framework to form an excitation coil;
the square induction winding framework comprises an outer square framework, a middle square framework and an inner square framework, the three square frameworks are respectively and mutually orthogonally arranged along the X axis, the Y axis and the Z axis of the three-dimensional coordinate system, and square grooves are formed in corresponding positions of the inner sides of the outer square framework and the middle square framework and are used for mutually nesting and arranging the inner square framework and the outer square framework; the annular excitation winding framework and the square induction winding framework are coaxial in triaxial; a square groove is arranged at a corresponding position on the inner side of the inner square framework and is used for being nested with a square embedding protrusion arranged on the outer circle of the outer annular framework; the induction winding is uniformly wound in the groove at the periphery of the outer square skeleton to form an induction coil.
2. The nested annular tri-axial fluxgate sensor probe of claim 1, wherein: the diameter of the outer annular framework is 20-30 mm, the length and width of the axial embedded convex part are 1-5 mm, and the thickness is 0.5-1 mm respectively; the diameter of the annular skeleton of the middle layer is 10 mm-20 mm, the length and width of the axial embedded convex part are 1 mm-5 mm and the thickness is 0.5 mm-1 mm respectively; the diameter of the inner annular framework is 5 mm-10 mm; all the skeletons are made of ceramic fiber materials or photosensitive resin materials.
3. The nested annular tri-axial fluxgate sensor probe of claim 1, wherein: four clamping grooves with the width of 0.5-1 mm and the length of 3.5-7 mm are respectively reserved at the inner circular positions of the outer annular framework and the middle annular framework and are used for fixing the annular framework of the next stage.
4. The nested annular tri-axial fluxgate sensor probe of claim 1, wherein: the width of the permalloy strip-shaped magnetic core is 3-10 mm, and the thickness is 0.1-0.3 mm; the permalloy Bao Tiaozhuang magnetic core is uniformly wound around the outer groove of the outer annular skeleton for two turns and is used as an excitation coil magnetic core of the detection probe.
5. The nested annular tri-axial fluxgate sensor probe of claim 1, wherein: the outer square framework, the middle square framework and the outer square framework are made of ceramic fiber materials or photosensitive resin materials.
6. The nested annular tri-axial fluxgate sensor probe of claim 1, wherein: four clamping grooves with the width of 1 mm-2 mm, the length of 10 mm-20 mm and the thickness of 0.5 mm-1 mm are respectively reserved on the inner sides of the outer layer square framework, the middle layer square framework and the inner layer square framework.
7. The nested annular tri-axial fluxgate sensor probe of claim 1, wherein: the induction winding or the excitation winding is made of enamelled copper wires, and 200-800 turns of enamelled copper wires are wound to form an induction coil or an excitation coil.
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