Design method of separated miniature magnetic probe of fluxgate sensor

Abstract

The invention provides a design method of a separated miniature magnetic probe of a fluxgate sensor. The design method comprises the following steps: dividing the fluxgate sensor into two independent structural units, namely a magnetic probe module and a signal processing module; the magnetic probe module adopts a #-shaped magnetic probe mounting base made of a non-magnetic material; x-axis, Y-axis and Z-axis magnetic field coils are installed on the base, and each axis is composed of two coils; the magnetic probe voltage signal adapter plate is embedded into the magnetic probe base so as to reduce the overall size; and the magnetic probe module is connected with the signal processing module through a shielding cable to realize signal transmission. According to the scheme, the magnetic probe module and the signal processing module of the fluxgate sensor are separated, the overall size is greatly reduced, and the application requirements of miniaturization and light weight are met.

Description

Technical Field

[0001] The invention belongs to the field of design and manufacture of fluxgate sensors, and in particular relates to a design method for a separated micro magnetic probe of a fluxgate sensor. Background Art

[0002] Small-sized, low-noise fluxgate sensors are required in many application scenarios, such as magnetic detection of small drones, geomagnetic matching navigation of aircraft, residual magnetism measurement and calibration of magnetic shielding tubes, and oil exploration drilling probes. The fluxgate sensor consists of a magnetic probe and a signal processing circuit, in which the magnetic probe is a magnetic field sensitive unit. It uses the principle of electromagnetic induction to output a voltage signal proportional to the ambient magnetic field. The signal processing circuit detects and amplifies the voltage signal of the magnetic probe, and then outputs it after filtering and noise reduction. Therefore, in small-sized, low-noise application scenarios, it is only necessary to install the magnetic probe of the fluxgate sensor in a space-constrained location, integrate the signal processing circuit into the measurement system, and realize signal transmission through the signal shielding cable and the magnetic probe.

[0003] Traditional fluxgate sensors integrate magnetic probes and signal processing circuits, such as Mag13 from Bartington, UK, Fvm400 from Meda, US, FS3A-A series from CSSC 710, HSF2 series from Xi'an Huashun, etc. They are rectangular in shape, with dimensions (length × width × height) greater than 100mm × 25mm × 25mm, and cylindrical in shape, with dimensions (diameter × length) greater than φ25mm × 100mm. Traditional instruments cannot meet the demand for miniaturized and lightweight fluxgate sensors in the fields of unmanned platform magnetic detection, magnetic navigation, metrology calibration, and drilling probes.

[0004] The design method of the fluxgate sensor separated miniature magnetic probe proposed in the present invention separates the magnetic probe and the signal processing circuit into two independent modules, uses a shielded cable to connect and transmit signals, and performs a miniaturized structural design on the magnetic probe module, including a tic-tac-toe magnetic probe mounting base design and an embedded magnetic field coil adapter circuit board. The fluxgate sensor magnetic probe is installed in a space-constrained position, the signal processing circuit is integrated into the measurement system, and signal transmission is achieved through the signal shielded cable and the magnetic probe, thereby solving the problem of the demand for miniaturization of fluxgate sensors in various application fields. Summary of the invention

[0005] In view of this, the present invention provides a design method for a separate micro magnetic probe of a fluxgate sensor, comprising:

[0006] The fluxgate sensor is divided into two independent structural units: a magnetic probe module and a signal processing module; the magnetic probe module adopts a "well"-shaped magnetic probe mounting base made of non-magnetic material;

[0007] The magnetic field coils of the three axes X, Y and Z are installed on the base, and each axis consists of two coils;

[0008] The magnetic probe voltage signal adapter board is embedded in the magnetic probe base to reduce the overall size; the magnetic probe module is connected to the signal processing module through a shielded cable to achieve signal transmission.

[0009] In particular, the magnetic probe voltage signal adapter board is mounted on the magnetic probe base by M2 screws in an embedded manner.

[0010] Particularly, the shielded cable is an 8-core cable, which includes X, Y, Z axis excitation signals, excitation ground signals, X, Y, Z axis detection signals and detection ground signals.

[0011] In particular, the magnetic probe module is installed in a space-constrained location, the signal processing module is integrated into the test system, and connected through a shielded cable, thus meeting the application requirements of miniaturization and low noise.

[0012] In particular, the magnetic probe base is made of PEEK non-magnetic material and has good corrosion resistance and insulation performance.

[0013] In particular, the X, Y, and Z three-axis magnetic field coils are respectively composed of two coils, each coil includes an excitation coil and a detection coil, and the winding method of the A coil and the B coil is consistent.

[0014] In particular, six hollow cylindrical holes with a diameter of d are provided inside the magnetic probe base for installing the magnetic field coils of the X, Y and Z axes, and are fixed by means of glue injection.

[0015] In particular, in the magnetic probe module, the magnetic field coil signals of the X, Y, and Z axes are respectively led out and connected to the signal adapter board, and then connected to the signal processing module through a shielded cable to realize signal transmission.

[0016] Beneficial effects:

[0017] Through the technical solution of the present invention, the magnetic probe module and the signal processing module of the fluxgate sensor are separated, which greatly reduces the overall size and meets the application requirements of miniaturization and lightweight.

[0018] By adopting the "well"-shaped magnetic probe mounting base design of the present invention and the embedded magnetic probe voltage signal adapter board, the volume of the magnetic probe module is further compressed, and a miniaturized design is achieved.

[0019] The present invention adopts a shielded cable to connect the magnetic probe module and the signal processing module, thereby effectively preventing signal interference and ensuring measurement accuracy.

[0020] By integrating the signal processing module with the actual test system, the overall layout is further optimized and the occupied space is reduced.

[0021] The present invention adopts non-magnetic PEEK material to make the magnetic probe base, which has good corrosion resistance and insulation performance and can meet the application requirements in harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The fluxgate sensor structure of the present invention;

[0023] Figure 2A A top view of a magnetic probe mounting base in the present invention;

[0024] Figure 2B It is a left view of the magnetic probe mounting base of the present invention;

[0025] Figure 2C It is a front view of the magnetic probe mounting base of the present invention;

[0026] Figure 2D This is a bottom view of the magnetic probe mounting base of the present invention;

[0027] Figure 3A It is a PCB board for transferring signals of the X and Z coils of the magnetic probe in the present invention;

[0028] Figure 3B It is a PCB board for transferring signals of the Y coil of the magnetic probe in the present invention;

[0029] Figure 4A and Figure 4B It is a schematic diagram of the connection mode of the magnetic field coil enameled wire of the magnetic probe in the present invention before and after connection. DETAILED DESCRIPTION

[0030] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0031] The fluxgate sensor structure of the present invention is as follows: Figure 1 As shown, the fluxgate sensor signal processing module 1, the signal shielding cable 2, the magnetic probe module 3, including the X, Y, Z three-axis magnetic field coils, and the magnetic probe mounting base. The fluxgate sensor signal processing module 1 can also be integrated with the actual test system circuit without taking up additional space.

[0032] The signal shielded cable uses an 8-core cable with an outer shield. The signals include X, Y, and Z axis excitation signals, excitation ground signals, X, Y, and Z axis detection signals, and detection ground signals.

[0033] The magnetic probe module includes a magnetic probe base, an X, Y, and Z axis magnetic probe voltage signal adapter board, and an X, Y, and Z axis magnetic field coil. Figure 2AAs shown in Figure 2D, the magnetic probe base is made of PEEK non-magnetic material, and the structure adopts a "well" shape design. The X, Y, and Z axis magnetic field coils are composed of two magnetic field coils respectively, with a total of 6 magnetic field coils, as shown in Figure 4, which are installed in 6 hollow cylindrical holes with a diameter of d on the magnetic probe base. Figure 2A -2D, and fixed with glue. Three signal transfer PCB boards are installed on the front, left and bottom of the magnetic probe mounting base. The middle raised position is used to embed the signal transfer circuit board to reduce the size of the magnetic probe base. There are 6 hollow cylindrical through holes in the magnetic probe base for installing the magnetic probe magnetic field coil.

[0034] The magnetic probe voltage signal adapter board is embedded into the magnetic probe base through M2 screws. The mounting holes are shown in Figure 2. The embedded method is convenient for reducing the size of the magnetic probe module. In Figure 2, three signal adapter PCB boards are installed on the front, left, and bottom of the magnetic probe mounting base. The middle raised position is used for embedding the signal adapter circuit board to reduce the size of the magnetic probe base. There are 6 hollow cylindrical through holes in the magnetic probe base for installing the magnetic probe magnetic field coil.

[0035] The X, Y, and Z axis magnetic field coils lead out 8 enameled wires respectively. The connection method is shown in Figure 4. After the enameled wire lead wires are welded to the signal adapter board, Figure 3B Connect all the signals of the magnetic probe to one end of the signal shielded cable through the 8-core connection hole. According to the actual application requirements, select the appropriate cable length and connect the other end of the signal shielded cable to the signal processing circuit module.

[0036] Figure 3A The middle PCB is used to lead out the voltage signals of the X and Z coils of the magnetic probe. Figure 3B The middle PCB is used to lead out the voltage signal of the Y coil of the magnetic probe, and at the same time, the voltage signals of the X and Z coils are led out to the signal shielded cable. The middle through hole of the PCB is used to be embedded in the base of the magnetic probe to reduce the size of the base of the magnetic probe.

[0037] Figure 4A -4B is the connection method of the magnetic probe magnetic field coil enameled wire. The fluxgate sensor has three magnetic axes, namely X, Y, and Z. Each axis consists of two magnetic field coils, including A coil and B coil. The A coil and B coil are wound in the same way, and are composed of a group of excitation coils and a group of detection coils. When the X-axis, Y-axis, and Z-axis magnetic field coils are combined, the A coil JL-2 and B coil JL-2 of the X-axis, Y-axis, and Z-axis are connected in series, and the A coil JB-2 and B coil JB-1 are connected in series.

[0038] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0039] It is obvious to those skilled in the art that the embodiments of the present invention are not limited to the details of the above exemplary embodiments, and that the embodiments of the present invention can be implemented in other specific forms without departing from the spirit or basic features of the embodiments of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the embodiments of the present invention is limited by the attached claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the embodiments of the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units, modules or devices stated in the system, device or terminal claims can also be implemented by the same unit, module or device through software or hardware. The words first, second, etc. are used to indicate names, and do not indicate any particular order.

[0040] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the embodiments of the present invention and are not intended to limit them. Although the embodiments of the present invention have been described in detail with reference to the above preferred implementation modes, those skilled in the art should understand that the technical solutions of the embodiments of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A design method for a separate micro-magnetic probe of a fluxgate sensor, characterized in that: include: The fluxgate sensor is divided into two independent structural units: a magnetic probe module and a signal processing module; the magnetic probe module adopts a "well"-shaped magnetic probe mounting base made of non-magnetic material; The magnetic field coils of the three axes X, Y and Z are installed on the base, and each axis consists of two coils; The magnetic probe voltage signal adapter board is embedded in the magnetic probe base to reduce the overall size; the magnetic probe module is connected to the signal processing module through a shielded cable to achieve signal transmission.

2. The design method of the fluxgate sensor separated micro magnetic probe according to claim 1 is characterized by: The magnetic probe voltage signal adapter plate is installed on the magnetic probe base by M2 screws in an embedded manner.

3. The design method of the fluxgate sensor separated micro magnetic probe according to claim 1 is characterized in that: The shielded cable is an 8-core cable, which includes X, Y, Z axis excitation signals, excitation ground signals, X, Y, Z axis detection signals and detection ground signals.

4. The design method of the fluxgate sensor separated micro-magnetic probe according to claims 1-3, characterized in that: The magnetic probe module is installed in a space-constrained location, the signal processing module is integrated into the test system, and connected through a shielded cable to meet the application requirements of miniaturization and low noise.

5. The design method of the fluxgate sensor separated micro magnetic probe according to claims 1-4, characterized in that: The magnetic probe base is made of PEEK non-magnetic material and has good corrosion resistance and insulation performance.

6. The design method of the fluxgate sensor separated micro magnetic probe according to claims 1-5, characterized in that: The X, Y, and Z three-axis magnetic field coils are respectively composed of two coils, each coil includes an excitation coil and a detection coil, and the winding method of the A coil and the B coil is consistent.

7. The design method of a fluxgate sensor separated micro-magnetic probe according to claims 1-6, characterized in that: The magnetic probe base is provided with 6 hollow cylindrical holes with a diameter of d inside, which are used to install the magnetic field coils of the X, Y and Z axes and are fixed by glue injection.

8. The design method of a fluxgate sensor separated micro-magnetic probe according to claims 1-7, characterized in that: In the magnetic probe module, the magnetic field coil signals of the X, Y, and Z axes are respectively led out and connected to the signal adapter board, and then connected to the signal processing module through a shielded cable to realize signal transmission.

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