Alternating current electromagnetic field array detection probe based on time division multiplexing technology

Abstract

The utility model discloses an alternating current electromagnetic field array detection probe based on a time division multiplexing technology, and belongs to the field of nondestructive testing. The array detection probe comprises a shell, a magnetic core fixedly mounted in the shell, an exciting coil spirally wound on the magnetic core, a sensor array module fixedly mounted in the shell and located at the lower part of the magnetic core, and a multiplexing module fixedly mounted in the shell and electrically connected with the exciting coil and the sensor array module, a detection port is formed in the shell, the magnetic cores are arranged in a U shape, the opening ends of the magnetic cores face the detection port of the shell, the multiple magnetic cores are arranged in the shell and are distributed in a linear array mode in the shell, and the axial direction of the sensor array module is parallel to the axial direction of the array distribution track of the multiple magnetic cores. According to the array detection probe, a magnetic field change signal is captured by the sensor array module and is converted into a clear and stable electric signal to be output, so that a more accurate data basis is provided for subsequent defect analysis.

Description

Technical Field

[0001] This application relates to the field of nondestructive testing technology, specifically an AC electromagnetic field array detection probe based on time-division multiplexing technology. Background Technology

[0002] Currently, non-destructive testing (NDT) technology plays a crucial role in industrial production and quality control. NDT refers to the method of inspecting and testing the structure, state, and type, quantity, shape, nature, location, size, distribution, and changes of defects in the internal structure and surface of a test piece without damaging or affecting its performance or internal structure. This is done by utilizing changes in thermal, acoustic, optical, electrical, and magnetic reactions caused by abnormalities or defects in the internal structure of the material, using physical or chemical methods and modern technology and equipment.

[0003] Existing AC electromagnetic field detection probes have many drawbacks, among which low sensitivity is the most prominent. The large spacing between the probe sensors results in low spatial resolution of the measured magnetic field image, making it difficult to accurately detect minute structural defects.

[0004] Therefore, this application provides an AC electromagnetic field array detection probe based on time-division multiplexing technology to solve the above problems. Utility Model Content

[0005] This application provides an AC electromagnetic field array detection probe based on time-division multiplexing technology, which aims to solve the problems of low sensitivity of existing AC electromagnetic field detection probes mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: an AC electromagnetic field array detection probe based on time-division multiplexing technology, comprising a housing, a magnetic core fixedly installed within the housing, an excitation coil spirally wound on the magnetic core, a sensor array module fixedly installed within the housing at the lower part of the magnetic core, and a multiplexing module fixedly installed within the housing and electrically connected to the excitation coil and the sensor array module.

[0007] The housing is provided with a detection port;

[0008] The magnetic core is U-shaped, with its open end facing the detection port of the housing;

[0009] Several magnetic cores are arranged in a linear array within the housing. The axis of the sensor array module is parallel to the axis of the array distribution trajectory of the magnetic cores. In use, the detection port on the housing is placed downwards against the surface of the object, so that the ends of the magnetic cores are in contact with the object surface. Alternating current is applied to the excitation coil. Based on the principle of electromagnetic induction, a uniform excitation magnetic field is generated under the action of the wide U-shaped array of magnetic cores. This forms a uniform current with relatively stable intensity throughout the detection area. When the object being detected has a defect, it interferes with the uniform current generated by the excitation, thus changing the surrounding magnetic field. These magnetic field change signals are captured by the sensor array module and converted into clear and stable electrical signals for output, providing more accurate data for subsequent defect analysis.

[0010] Preferably, in order to install the sensor array module, a support plate adapted to the sensor array module is fixedly installed at the detection port. The support plate has an installation cavity, and the sensor array module is inserted into the installation cavity and fixed by bolts through the side wall of the support plate, which facilitates disassembly and maintenance.

[0011] Preferably, in order to improve detection sensitivity, the sensor array module is composed of one or more high-sensitivity sensors such as coil sensors, Hall sensors, anisotropic magnetoresistance, and giant magnetoresistance, to ensure sensitivity when capturing electromagnetic signals.

[0012] Preferably, in order to improve the sensing range, the magnetic core consists of two symmetrically arranged support ends and a winding section. The two support ends are fixedly installed at both ends of the winding section, and the excitation coil is wound on the winding section. The winding section and the support ends are integrally formed, and the length of the winding section is greater than the length of the support ends, thereby expanding the range of the uniform electric field to be sensed, thereby further improving the sensitivity during detection.

[0013] Preferably, in order to support the magnetic core, a number of evenly distributed partition plates are fixedly installed on two opposite surfaces inside the housing, and the support end is snapped between the two oppositely arranged partition plates to avoid shaking from affecting the detection and improve stability.

[0014] Preferably, for ease of use, the housing is provided with a wiring hole, which is positioned opposite to the detection port, making it more flexible, convenient, and easy to use.

[0015] Preferably, for stable detection, the bottom plane of the sensor array module is higher than the bottom plane of the housing to avoid the metal parts affecting the bottom magnetic field.

[0016] This array detection probe places the detection port on the housing downwards against the surface of the object, so that the end of the magnetic core is in contact with the object surface. When an alternating current is applied to the excitation coil, a uniform excitation magnetic field is generated under the action of the magnetic core distributed in a wide U-shaped array, based on the principle of electromagnetic induction. This generates a uniform current with relatively stable intensity throughout the detection area. When there is a defect in the object being detected, it will interfere with the uniform current generated by the excitation. These magnetic field change signals are captured by the sensor array module and converted into clear and stable electrical signal output, providing more accurate data for subsequent defect analysis.

[0017] This array detection probe connects the excitation coil and sensor array module via wiring holes to external devices, making it more flexible, convenient, and easy to use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of an AC electromagnetic field array detection probe based on time-division multiplexing technology.

[0019] Figure 2 This is a schematic diagram of the bottom structure of an AC electromagnetic field array detection probe based on time-division multiplexing technology;

[0020] Figure 3 This is a schematic diagram of the internal structure of an AC electromagnetic field array detection probe based on time-division multiplexing technology.

[0021] Figure 4 This is a schematic diagram of the magnetic core structure of an AC electromagnetic field array detection probe based on time-division multiplexing technology;

[0022] Figure 5 This is a schematic cross-sectional view of an AC electromagnetic field array detection probe based on time-division multiplexing technology.

[0023] Figure 6 This is a schematic diagram illustrating the change in the magnetic field on the surface of the object being measured when using an AC electromagnetic field array detection probe based on time-division multiplexing technology.

[0024] In the picture:

[0025] 1. Housing; 11. Detection port; 12. Separator; 13. Wiring hole; 2. Magnetic core; 21. Support end; 22. Winding part; 3. Excitation coil; 4. Sensor array module; 41. Support plate; 42. Mounting cavity; 5. Multiplexing module. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] Example 1

[0028] This embodiment provides an AC electromagnetic field array detection probe based on time-division multiplexing technology, such as... Figure 1-6 As shown, the array detection probe includes a housing 1, a magnetic core 2 fixedly installed inside the housing 1, an excitation coil 3 spirally wound on the magnetic core 2, a sensor array module 4 fixedly installed inside the housing 1 at the lower part of the magnetic core 2, and a multiplexing module 5 fixedly installed inside the housing 1 and electrically connected to the excitation coil 3 and the sensor array module 4.

[0029] A detection port 11 is provided on the housing 1;

[0030] The magnetic core 2 is U-shaped, with the open end of the magnetic core 2 facing the detection port 11 of the housing 1;

[0031] Several magnetic cores 2 are arranged inside the housing 1, and the magnetic cores 2 are arranged in a linear array inside the housing 1. The axis of the sensor array module 4 is parallel to the axis of the array distribution trajectory of the magnetic cores 2.

[0032] In use, the detection port 11 on the housing 1 is placed downwards against the surface of the object, so that the end of the magnetic core 2 is in contact with the object surface. Alternating current is applied to the excitation coil 3. Based on the principle of electromagnetic induction, a uniform excitation magnetic field is generated under the action of the wide U-shaped array of magnetic cores 2, forming a relatively stable uniform current within the detection area. When the object being detected has a defect, it interferes with the uniform current generated by the excitation, thus changing the surrounding magnetic field and generating magnetic field components in the B_{x}, B_{y}, and B_{z} directions. These magnetic field change signals are captured by the sensor array module 4 and converted into clear and stable electrical signal outputs, providing more accurate data for subsequent defect analysis.

[0033] Specifically, a support plate 41 adapted to the sensor array module 4 is fixedly installed at the detection port 11. The support plate 41 has an installation cavity 42. The sensor array module 4 is inserted into the installation cavity 42 and fixed by bolts through the side wall of the support plate 41.

[0034] In use, the sensor array module 4 is inserted from the mounting cavity 42 into the support plate 41 and then fixed with bolts to complete the assembly with the housing 1, so that it is stably installed under the magnetic core 2 for easy disassembly and maintenance.

[0035] More specifically, the sensor array module 4 is composed of one or more of the following high-sensitivity sensors: coil sensor, Hall sensor, anisotropic magnetoresistive sensor, giant magnetoresistive sensor, etc.

[0036] In use, the sensor array module 4 is composed of one or more of the following high-sensitivity sensors: coil sensors, Hall sensors, anisotropic magnetoresistance, giant magnetoresistance, etc., arranged in a linear array and compactly distributed below the magnetic core 2 to ensure sensitivity when capturing electromagnetic signals.

[0037] Furthermore, the magnetic core 2 consists of two symmetrically arranged support ends 21 and a winding part 22. The two support ends 21 are fixedly installed at both ends of the winding part 22, and the excitation coil 3 is wound on the winding part 22. The winding part 22 and the support ends 21 are integrally formed, and the length of the winding part 22 is greater than the length of the support ends 21.

[0038] In use, the winding part 22 is longer than the support end 21, and the magnetic core 2 is set as a wide body, thereby expanding the range of the uniform electric field to be induced, thereby further improving the sensitivity during detection.

[0039] Furthermore, several evenly distributed partition plates 12 are fixedly installed on two opposing surfaces inside the housing 1, and the support end 21 is snapped between the two opposing partition plates 12.

[0040] In use, the magnetic core 2 is inserted one by one into the cavities separated by the partition plate 12 through the support end 21, so that the housing 1 and the magnetic core 2 can be tightly combined, avoiding the impact of shaking on the detection and improving stability.

[0041] The bottom plane of the sensor array module 4 is higher than the bottom plane of the housing 1.

[0042] When using it, the sensor array module 4 should be placed above the plane of the object being measured to reduce wear and avoid the metal parts affecting the magnetic field at the bottom.

[0043] Example 2

[0044] The housing 1 has a wiring hole 13, which is positioned opposite to the detection port 11.

[0045] In use, the wiring used to connect the excitation coil 3 and the sensor array module 4 is passed through the wiring hole 13 to connect with external devices, which is more flexible, convenient and easy to use.

[0046] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. An alternating electromagnetic field array detection probe based on time division multiplexing technology, comprising a shell (1), a magnetic core (2) fixedly installed in the shell (1), an excitation coil (3) spirally wound on the magnetic core (2), a sensor array module (4) fixedly installed in the lower part of the magnetic core (2) in the shell (1), and a multiplexing module (5) fixedly installed in the shell (1) and electrically connected with the excitation coil (3) and the sensor array module (4), characterized in that: a detection port (11) is formed in the shell (1); the magnetic core (2) is arranged in a U shape, and the open end of the magnetic core (2) faces the detection port (11) of the shell (1); a plurality of magnetic cores (2) are arranged in the shell (1) in a linear array, and the axial direction of the sensor array module (4) is parallel to the axial direction of the array distribution of the plurality of magnetic cores (2).

2. The alternating electromagnetic field array detection probe based on time-division multiplexing technology according to claim 1, characterized in that: A support plate (41) matched with the sensor array module (4) is fixedly installed at the detection port (11), and an installation cavity (42) is formed in the support plate (41), the sensor array module (4) is inserted into the installation cavity (42) and fixed by a bolt penetrating through the side wall of the support plate (41).

3. The AC electromagnetic field array detection probe based on time division multiplexing technology according to claim 1, characterized in that: The sensor array module (4) is composed of one or more of coil sensors, Hall sensors, anisotropic magnetoresistance, giant magnetoresistance and other high-sensitivity sensors.

4. The alternating electromagnetic field array detection probe based on time-division multiplexing technology according to claim 1, characterized in that: The magnetic core (2) is composed of two symmetrically arranged support ends (21) and a winding part (22), the two support ends (21) are fixedly installed at both ends of the winding part (22), the excitation coil (3) is wound on the winding part (22), the winding part (22) is integrally formed with the support end (21), and the length of the winding part (22) is greater than the length of the support end (21).

5. The alternating electromagnetic field array detection probe based on time-division multiplexing technology according to claim 4, characterized in that: A plurality of evenly arranged partition plates (12) are fixedly installed on the two opposite surfaces in the shell (1), and the support end (21) is clamped between the two oppositely arranged partition plates (12).

6. The alternating electromagnetic field array detection probe based on time-division multiplexing technology according to claim 1, characterized in that: A wire hole (13) is formed in the shell (1), and the wire hole (13) is oppositely arranged with the detection port (11).

7. The alternating electromagnetic field array detection probe based on time-division multiplexing technology according to claim 1, characterized in that: The bottom plane height of the sensor array module (4) is higher than the bottom plane height of the shell (1).

Images