Incremental magnetic field reproduction system based on constant magnetic moment magnetic source array

Abstract

The invention provides an incremental magnetic field reproduction system based on a constant magnetic moment magnetic source array, and the system comprises the constant magnetic moment magnetic source array which is composed of four magnetic moment coils and four current sources, and the four magnetic moment coils are arranged in a square array and are vertically and upwards installed; the environment magnetic field monitoring module adopts a fluxgate magnetometer to detect an environment magnetic field and transmits data to the calculation and control module; and the calculation and control module calculates and controls the four current sources to output excitation current in real time according to the environment magnetic field value, the set incremental magnetic field size and the calibration height, so that the set incremental magnetic field is generated in the aerial calibration working area. The airborne magnetic detector mounted on the carrying platform can be calibrated on site, and the defect that calibration can only be carried out before the airborne magnetic detector is mounted on the platform in the prior art is overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetometry, and in particular relates to an incremental magnetic field reproduction system based on a constant magnetic moment magnetic source array. Background Art

[0002] The existing magnetic field reproduction system is mainly composed of a three-axis magnetic field coil, a geomagnetic compensation module, a constant current source, a magnetic field measurement module, and a control module. The control module controls the constant current source to excite the three-axis magnetic field coil to generate a constant magnetic field inside the coil. The geomagnetic compensation module is used to compensate for geomagnetic fluctuations, and the measurement module is used to measure the reproduced magnetic field value.

[0003] The existing magnetic field reproduction system generates a constant magnetic field inside the three-axis magnetic field coil, and can only be calibrated before the airborne magnetic detector is installed on the platform, and then installed on the platform after the calibration is completed. However, due to the influence of platform interference, background magnetic field noise, changes in motion posture, and eddy current fields generated by engine operation, the measurement indicators of the airborne magnetic detector will change after being installed on the platform.

[0004] The invention reproduces the incremental magnetic field in the air through a constant magnetic moment magnetic source array, and can calibrate the airborne magnetic detector installed on the carrying platform. Summary of the invention

[0005] In view of this, the present invention provides an incremental magnetic field reproduction system based on a constant magnetic moment magnetic source array, comprising:

[0006] The constant magnetic moment source array is composed of 4 magnetic moment coils and 4 current sources, wherein the 4 magnetic moment coils are arranged in a square array and installed vertically upward;

[0007] The environmental magnetic field monitoring module uses a fluxgate magnetometer to detect the environmental magnetic field and transmit the data to the calculation and control module;

[0008] The calculation and control module calculates and controls the output excitation current of four current sources in real time according to the environmental magnetic field value, the set incremental magnetic field size and the calibration height, thereby generating the set incremental magnetic field in the air calibration work area.

[0009] Particularly, the four magnetic moment coils are wound on the magnetic core material using a single-layer spiral tube coil structure or a thin-wall magnetic field coil structure.

[0010] In particular, the calculation and control module can adjust the output currents of the four current sources in real time according to the detected values ​​of the environmental magnetic field, so as to maintain the set incremental magnetic field in the calibration working area.

[0011] In particular, the calibration working area is located in the area directly above the square array formed by the four magnetic moment coils.

[0012] In particular, the calculation and control module includes a parameter setting unit and an operation and control unit, the former is used to set the incremental magnetic field size and calibration height, and the latter is used to calculate the excitation current in real time and control the output.

[0013] In particular, the system can perform on-site calibration of the airborne magnetic detector after it is installed on the carrying platform.

[0014] Beneficial effects:

[0015] Through the technical solution of the present invention, a constant magnetic moment magnetic source array is used to reproduce the incremental magnetic field in the air, so that the airborne magnetic detector installed on the carrying platform can be calibrated on-site, which makes up for the defect that the existing technology can only be calibrated before being installed on the platform.

[0016] By adopting the technical solution of the present invention, four magnetic moment coils are arranged in a square array, so that a uniform incremental magnetic field can be formed in the calibration working area, thereby improving the calibration accuracy.

[0017] Through the technical solution of the present invention, the incremental magnetic field stability in the calibration working area can be ensured to cope with the changes in the environmental magnetic field by adopting the method of real-time detection of the environmental magnetic field and dynamic adjustment of the excitation current.

[0018] Through the technical solution of the present invention, functional units such as the environmental magnetic field monitoring module, the calculation control module, and the magnetic field measurement module are integrated to form a complete incremental magnetic field reproduction system that is simple to operate and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a system composition diagram proposed in the present invention;

[0020] Figure 2 This is a layout diagram of the magnetic source array proposed in the present invention. DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0022] The present invention provides a system comprising a constant magnetic moment magnetic source array, an environmental magnetic field monitoring module, and a calculation and control module. Figure 1 shown.

[0023] The constant magnetic moment source array is the core of the system, which consists of 4 magnetic moment coils and 4 current sources. The magnetic moment coil is wound on the magnetic core material with a single-layer spiral tube coil structure or a thin-walled magnetic field coil structure. The magnetic field coil is excited by an external excitation current to generate a magnetic field, which magnetizes the magnetic core material and generates a magnetic field. The 4 current sources provide excitation currents to the 4 magnetic moment coils respectively. Each magnetic moment coil will generate a magnetic field in the air under the excitation of the current source. Arrange the 4 magnetic moment coils in a square and install them on the same plane so that they are vertically upward, such as Figure 2 shown.

[0024] The environmental magnetic field monitoring module uses a fluxgate magnetometer to monitor the environmental magnetic field and transmits the environmental magnetic field data to the calculation and control module. The calculation and control module controls the operation of each device of the system and calculates the excitation current in real time according to the environmental magnetic field value, the set incremental magnetic field size, and the calibration height.

[0025] The working principle of this system is as follows: after setting the calibration height and incremental magnetic field value in the calculation and control module, the calculation and control module reads the ambient magnetic field value measured by the ambient magnetic field monitoring module in real time, calculates the excitation current required for the constant magnetic moment magnetic source array, and controls the output of four current sources, thereby generating the set incremental magnetic field in the air calibration work area.

[0026] 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.

[0027] 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.

[0028] 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. An incremental magnetic field reproduction system based on a constant magnetic moment magnetic source array, characterized in that: include: The constant magnetic moment source array is composed of 4 magnetic moment coils and 4 current sources, wherein the 4 magnetic moment coils are arranged in a square array and installed vertically upward; The environmental magnetic field monitoring module uses a fluxgate magnetometer to detect the environmental magnetic field and transmit the data to the calculation and control module; The calculation and control module calculates and controls the output excitation current of four current sources in real time according to the environmental magnetic field value, the set incremental magnetic field size and the calibration height, thereby generating the set incremental magnetic field in the air calibration work area.

2. The incremental magnetic field reproduction system based on a constant magnetic moment magnetic source array according to claim 1, characterized in that: The four magnetic moment coils are wound on the magnetic core material using a single-layer spiral tube coil structure or a thin-wall magnetic field coil structure.

3. The incremental magnetic field reproduction system based on the constant magnetic moment magnetic source array according to claims 1-2, characterized in that: The calculation and control module can adjust the output currents of the four current sources in real time according to the environmental magnetic field detection value, so as to maintain the set incremental magnetic field in the calibration working area.

4. The incremental magnetic field reproduction system based on the constant magnetic moment magnetic source array according to claims 1-3, characterized in that: The calibration work area is located directly above the square array formed by the four magnetic moment coils.

5. The incremental magnetic field reproduction system based on a constant magnetic moment magnetic source array according to claims 1-4, characterized in that: The calculation and control module includes a parameter setting unit and an operation and control unit, the former is used to set the incremental magnetic field size and calibration height, and the latter is used to calculate the excitation current in real time and control the output.

6. The incremental magnetic field reproduction system based on a constant magnetic moment magnetic source array according to claims 1-5, characterized in that: The system can calibrate the airborne magnetic detector on site after it is installed on the carrying platform.

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