Magnetic field measuring device

Abstract

The invention discloses a magnetic field measuring device, which comprises a computer, a magnetic measurement probe, a signal conversion module and a three-dimensional orientation device capable of enabling the magnetic measurement probe to directly detect the instantaneous magnetic field intensity and direction of each point location in a space, the magnetic measurement probe comprises a first PCB (Printed Circuit Board) and a magnetoresistive sensor, and the magnetoresistive sensor is fixed on the first PCB; the signal conversion module comprises a second PCB, an active filtering and amplifying circuit, an AD conversion module, an STM32 chip and an OLED display screen, the active filtering and amplifying circuit, the AD conversion module, the STM32 chip and the OLED display screen are integrated on the second PCB, and the second PCB is in telecommunication connection with a computer and is connected with the first PCB through a wire; compared with the prior art, a magnetoresistive sensor assembly is used as a magnetic measurement probe, the probe is connected with an internal circuit of the device, the probe is placed at a proper position of the novel structure, and the probe is rotated at different azimuth angles to realize rapid detection of weak magnetic fields of a certain determined point in space along different directions.

Description

Technical Field

[0001] The invention relates to a magnetic field measuring device. Background Art

[0002] The existing magnetic field detection device uses the Faraday electromagnetic induction principle. The magnetic probe is composed of N turns of coils. The magnetic field size is tested by the voltage number on the connected digital millivoltmeter. This device cannot directly obtain the magnitude of the magnetic field strength. Moreover, since the magnetic probe is composed of N turns of coils, the device cannot detect weak magnetic fields in space.

[0003] Existing magnetic field detection devices are limited by measurement accuracy. The accuracy of common magnetic field detection equipment is difficult to reach the weak magnetic field measurement standard and is too much affected by the environment.

[0004] Existing magnetic field detection devices have high-sensitivity magnetic field measurement technology, which involves complex equipment and working principles, resulting in high equipment costs and difficult maintenance.

[0005] Existing magnetic field detection devices are complex to operate. Devices similar to spectrum analyzers require professionals to interpret frequency and intensity data, which requires too much professional skills. Summary of the invention

[0006] In view of the above, the present invention provides a magnetic field measuring device to solve the problems existing in the above-mentioned prior art.

[0007] The technical solution provided by the present invention is as follows:

[0008] A magnetic field measuring device, comprising a computer, a magnetic probe, a signal conversion module, and a three-dimensional orientation device that enables the magnetic probe to directly detect the magnitude and direction of the instantaneous magnetic field intensity at each point in space;

[0009] The magnetic measuring probe comprises a first PCB board and a magnetoresistive sensor, and the magnetoresistive sensor is fixed on the first PCB board;

[0010] The signal conversion module includes a second PCB board, an active filter amplifier circuit, an AD conversion module, an STM32 chip, and an OLED display screen. The active filter amplifier circuit, the AD conversion module, the STM32 chip, and the OLED display screen are integrated on the second PCB board. The second PCB board is connected to the computer telecommunications and connected to the first PCB board through a wire. The computer power supply supplies power to the STM32 chip and thus supplies power to the entire device. After the magnetoresistive sensor collects data, the data passes through the active filter amplifier circuit. The voltage signal after filtering and amplification is converted by the AD conversion module into a digital signal and transmitted to the STM32 chip for processing. The processed signal is directly represented as magnetic field intensity on the OLED screen;

[0011] The three-dimensional orientation device comprises a base plate, a rod, a compass, a first scale for conveniently viewing the horizontal orientation, and a second scale for conveniently viewing the vertical orientation. The rod is vertically arranged with the base plate, and the bottom end of the rod is connected to the center of the base plate. The compass is arranged on a corner of the base plate surface. The first scale is arranged on the base plate surface with the bottom end of the rod as the center and is located on the same side as the compass. The second scale is arranged at the upper end of the rod.

[0012] The rod is provided with a groove for placing a magnetic probe;

[0013] The floor is also provided with direction lines that intersect vertically with the bottom end of the rod as the center and indicate four directions, and scales are provided on the rod and the direction lines;

[0014] When measuring magnetism, the direction line determines the horizontal direction of the magnetic field, the rod determines the vertical direction of the magnetic field, and the first scale and the second scale jointly determine the direction of the magnetic field.

[0015] Preferably, the bottom end of the rod is rotatably connected to the center of the base plate.

[0016] Preferably, the measuring angle of the first scale is 0° to 180°, and scale lines are arranged every 10°.

[0017] Preferably, the measuring angle of the second scale is 0° to 180°, and scale lines are arranged every 10°.

[0018] The beneficial effects of the present invention are:

[0019] A magnetoresistive sensor assembly is used as a magnetic measuring probe, which is connected to the internal circuit of the device. The probe is placed at an appropriate position of the new structure, and rapid detection of weak magnetic fields in different directions at a certain point in space can be achieved by rotating the probe at different azimuth angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the three-dimensional orientation device of the present invention;

[0021] Figure 2 It is a schematic diagram of signal transmission of the present invention;

[0022] Figure 3 It is the circuit principle diagram of the present invention;

[0023] In the figure, 1. computer; 2. first PCB board; 3. magnetoresistive sensor; 4. second PCB board; 5. source filter amplifier circuit; 6. AD conversion module; 7. STM32 chip; 8. OLED display screen; 9. bottom plate; 10. rod; 11. compass; 12. first scale; 13. second scale. DETAILED DESCRIPTION

[0024] The present invention is further described below with reference to the accompanying drawings and some embodiments.

[0025] Figure 1 -, a magnetic field measuring device, including a computer 1, a magnetic probe, a signal conversion module, and a three-dimensional orientation device that enables the magnetic probe to directly detect the magnitude and direction of the instantaneous magnetic field intensity at each point in space;

[0026] The magnetic probe comprises a first PCB board 2 and a magnetoresistive sensor 3, and the magnetoresistive sensor 3 is fixed on the first PCB board 2;

[0027] The signal conversion module includes a second PCB board 4, an active filter amplifier circuit 5, an AD conversion module 6, an STM32 chip 7, and an OLED display screen 8. The active filter amplifier circuit 5, the AD conversion module 6, the STM32 chip 7, and the OLED display screen 8 are integrated on the second PCB board 4. The second PCB board 4 is connected to the computer 1 by telecommunications, and is connected to the first PCB board 2 through a wire. The STM32 chip 7 adopts an STM32F103C8T6 chip or an APM32F103C8T6 chip. The computer 1 power supply supplies power to the STM32 chip 7 and thus supplies power to the entire device. After the magnetoresistive sensor 3 collects data, it passes through the active filter amplifier circuit 5. The voltage signal after filtering and amplification is converted by the AD conversion module 6 into a digital signal and transmitted to the STM32 chip 7 for processing. The processed signal is directly represented as magnetic field intensity on the OLED screen. Figure 3 The detailed circuit principle of the invention is shown in detail, which is the same as the principle of magnetic measurement in the prior art.

[0028] The three-dimensional orientation device comprises a base plate 9, a rod 10, a compass 11, a first scale 12 for conveniently viewing the horizontal orientation, and a second scale 13 for conveniently viewing the vertical orientation. The rod 10 is vertically arranged with respect to the base plate 9, and the bottom end of the rod 10 is connected to the center position of the base plate 9. The compass 11 is arranged at a corner of the surface of the base plate 9. The first scale 12 is arranged on the surface of the base plate 9 with the bottom end of the rod 10 as the center, and is located on the same side as the compass 11. The second scale 13 is arranged at the upper end of the rod 10.

[0029] The rod 10 is provided with a groove for placing a magnetic probe;

[0030] The floor is also provided with direction lines which are perpendicularly intersected with the bottom end of the rod 10 as the center and indicate four directions, and scales are provided on the rod 10 and the direction lines.

[0031] In this embodiment, the bottom end of the rod 10 is rotatably connected to the center of the bottom plate 9 .

[0032] In this embodiment, the measuring angle of the first scale 12 is 0° to 180°, and scale lines are set every 10°; the measuring angle of the second scale 13 is 0° to 180°, and scale lines are set every 10°.

[0033] The specific measurement method in the present invention is:

[0034] With the rod 10 as the center, the angle and the position in the vertical direction of the rod 10 are adjusted by the magnetic probe. After passing through the signal conversion module, the magnetic field strength on the OLED display screen 8 is read, so as to obtain the strength of the magnetic field in multiple angular directions in the same plane, and the direction of the magnetic field is obtained through the angle indication of the first scale 12 and the second scale 13. The direction line and the scales set on the rod 10 can be used to obtain the orientation of the spatial point, thereby realizing rapid detection of the magnetic field along different directions at a certain point in the space.

[0035] In this embodiment, the control circuit of the present invention is a common circuit in the circuit field. The device of the present invention can be connected to an external power supply or a built-in battery through a power cord to provide power for the device. Technicians in the relevant technical field can implement it and will not be elaborated here.

[0036] It is worth noting that: in the description of the present invention, the meaning of "multiple" is two or more than two, unless otherwise clearly and specifically defined. In the present invention, unless otherwise clearly stipulated and defined, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; the circuits described in the present invention are all commonly used circuits in the art, and other related components are all existing commonly used components. For ordinary technicians in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features 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 present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A magnetic field measuring device, characterized in that: It includes a computer, a magnetic probe, a signal conversion module, and a three-dimensional orientation device that enables the magnetic probe to directly detect the magnitude and direction of the instantaneous magnetic field intensity at each point in space; The magnetic measuring probe comprises a first PCB board and a magnetoresistive sensor, and the magnetoresistive sensor is fixed on the first PCB board; The signal conversion module includes a second PCB board, an active filter amplifier circuit, an AD conversion module, an STM32 chip, and an OLED display screen. The active filter amplifier circuit, the AD conversion module, the STM32 chip, and the OLED display screen are integrated on the second PCB board. The second PCB board is connected to the computer telecommunications and connected to the first PCB board through a wire. The computer power supply supplies power to the STM32 chip and thus supplies power to the entire device. After the magnetoresistive sensor collects data, the data passes through the active filter amplifier circuit. The voltage signal after filtering and amplification is converted by the AD conversion module into a digital signal and transmitted to the STM32 chip for processing. The processed signal is directly represented as magnetic field intensity on the OLED screen; The three-dimensional orientation device comprises a base plate, a rod, a compass, a first scale for conveniently viewing the horizontal orientation, and a second scale for conveniently viewing the vertical orientation. The rod is vertically arranged with the base plate, and the bottom end of the rod is connected to the center of the base plate. The compass is arranged on a corner of the base plate surface. The first scale is arranged on the base plate surface with the bottom end of the rod as the center and is located on the same side as the compass. The second scale is arranged at the upper end of the rod. The rod is provided with a groove for placing a magnetic probe; The floor is also provided with direction lines that intersect vertically with the bottom end of the rod as the center and indicate four directions, and scales are provided on the rod and the direction lines; With the pole as the center, the magnetic probe is adjusted in angle and position in the vertical direction of the pole to obtain the strength of the magnetic field in multiple angular directions in the same plane, and the direction of the magnetic field is obtained through the angle indication of the first scale and the second scale, and the orientation of the spatial point is obtained through the direction line and the scales set on the pole, thereby realizing rapid detection of the magnetic field along different directions at a certain point in space.

2. A magnetic field measuring device according to claim 1, characterized in that: The bottom end of the rod is rotatably connected to the center of the bottom plate.

3. A magnetic field measuring device according to claim 1, characterized in that: The measuring angle of the first scale is 0° to 180°, and scale lines are arranged every 10°.

4. A magnetic field measuring device according to claim 1, characterized in that: The measuring angle of the second scale is from 0° to 180°, and scale lines are arranged every 10°.

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