Magnetic flux leakage detection sensor based on T-shaped magnetizing field

Abstract

The invention discloses a magnetic flux leakage detection sensor based on a T-shaped magnetizing field. The magnetic flux leakage detection sensor based on the T-shaped magnetizing field comprises a T-shaped magnet yoke, a magnetizer and a magnetic sensitive element. The T-shaped magnet yoke comprises an upper yoke, a first permanent magnet, a first pole shoe, a second permanent magnet, a second pole shoe, a third permanent magnet and a third pole shoe. The front end of the upper yoke, the first permanent magnet and the first pole shoe are sequentially contacted; the left end of the rear part of the upper yoke, the second permanent magnet and the second pole shoe are sequentially contacted; the right end of the rear part of the upper yoke, a third permanent magnet and a third pole shoe are sequentially contacted; the middle left side of the upper yoke is contacted with the magnetizer; the at least one first magnetic sensitive element is arranged right below the front part of the upper yoke; and at least one second magnetic sensitive element is arranged right below the rear part of the upper yoke. By arranging the first magneto-sensitive element and the second magneto-sensitive element, cross mutual detection of crack defects can be realized, and the detection accuracy and the detection efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial non-destructive testing, and particularly to a magnetic flux leakage detection sensor for defects based on a T-shaped magnetic field. Background Art

[0002] Non-destructive testing is a technology that uses techniques such as rays, ultrasound, magnetic powder, and eddy current to detect and evaluate internal and surface defects and properties of materials or workpieces without damaging the object being detected. It is widely used in multiple fields to ensure safety and quality.

[0003] Magnetic flux leakage detection is a non-destructive testing technology based on magnetic principles, mainly used to detect defects on the surface or near the surface of ferromagnetic components (such as steel, iron, etc.). In the detection of defects in ferromagnetic components, a magnetic field is applied to the ferromagnetic component through a permanent magnet or an electromagnetic coil to make it reach the magnetic saturation state. In the case of no defects, the magnetic flux lines will uniformly pass through the material interior. When there are defects (such as cracks, pores, etc.) in the weld, the magnetic flux lines will be distorted at the defects, and some magnetic flux lines will overflow the material surface, forming a magnetic flux leakage field. The intensity and distribution of the magnetic flux leakage field are closely related to the size, shape, and position of the defects. A magnetic sensitive element, such as a Hall, giant magnetoresistance, or tunnel magnetoresistance element, is used to scan the surface of the ferromagnetic component to obtain the magnetic flux leakage field signal.

[0004] In magnetic flux leakage detection, the intensity of the magnetic flux leakage field depends on the cross-sectional area of the defect perpendicular to the magnetization direction. Therefore, the angle between the magnetization direction of the magnetic flux leakage sensor and the crack defect will seriously affect the intensity and distribution of the magnetic flux leakage field. When the magnetization direction of the magnetic flux leakage sensor is parallel to the crack direction, the cross-sectional area of the crack perpendicular to the magnetization direction is the smallest, the magnetic flux leakage field is weak, and it is difficult for the magnetic sensitive element to detect the magnetic flux leakage signal. On the contrary, when the magnetization direction is perpendicular to the crack direction, the cross-sectional area of the crack perpendicular to the magnetization direction is the largest, the magnetic flux leakage field is the strongest, and the magnetic flux leakage signal that the magnetic sensitive element can detect is the largest. In actual detection, the direction of the crack may be random. The sensors used for magnetic flux leakage detection in the prior art are all excited in a single direction. If the goal of multi-angle crack detection is to be achieved, two magnetic flux leakages excited in two mutually perpendicular directions need to be used together for detection. When detecting the component to be measured, first, a magnetic flux leakage detection sensor with one excitation direction is used to scan and detect along the surface of the component to be measured, and then another magnetic flux leakage detection sensor with the other excitation direction is used to scan the surface of the component to be measured again to achieve accurate imaging of the defect and cross-verify whether the defect is missed. It can be seen that the solution of using multiple independent sensors to detect the object to be measured in the prior art increases the complexity and cost of the detection system, and the detection efficiency is low. Summary of the Invention

[0005] The present invention provides a magnetic flux leakage detection sensor based on a T-shaped magnetic field, so as to solve the problems of low accuracy of traditional single magnetization direction magnetic flux leakage sensors in detecting crack-like defects in any direction in ferromagnetic components, high cost and low efficiency of the split detection technology.

[0006] The magnetic flux leakage detection sensor based on a T-shaped magnetic field includes: a yoke, a magnetic conductor, at least one first magnetic sensitive element, and at least one second magnetic sensitive element;

[0007] The yoke includes an upper yoke iron, a first permanent magnet, a first pole shoe, a second permanent magnet, a second pole shoe, a third permanent magnet, and a third pole shoe;

[0008] The top surface of the first permanent magnet is in contact with the front bottom surface of the upper yoke iron, the top surface of the first pole shoe is in contact with the bottom surface of the first permanent magnet, the top surface of the second permanent magnet is in contact with the rear left bottom surface of the upper yoke iron, the top surface of the second pole shoe is in contact with the bottom surface of the second permanent magnet, the top surface of the third permanent magnet is in contact with the rear right bottom surface of the upper yoke iron, the top surface of the third pole shoe is in contact with the bottom surface of the third permanent magnet, and the top surface of the magnetic conductor is in contact with the middle left bottom surface of the upper yoke iron;

[0009] The magnetic conductor is made of a ferromagnetic material with a higher magnetic permeability than the yoke;

[0010] The magnetic poles on the top surface of the first permanent magnet are the same as the magnetic poles on the top surface of the second permanent magnet, and the magnetic poles on the top surface of the first permanent magnet are opposite to the magnetic poles on the top surface of the third permanent magnet;

[0011] At least one of the first magnetic sensitive elements is located below the front part of the upper yoke iron and is arranged between the first pole shoe and the magnetic conductor, the sensitive direction of the first magnetic sensitive element is the first direction X, at least one of the second magnetic sensitive elements is located below the rear part of the upper yoke iron and is arranged between the second pole shoe and the third pole shoe, and the detection direction of the second magnetic sensitive element is the second direction Y;

[0012] The distances between at least one of the first magnetic sensitive elements, at least one of the second magnetic sensitive elements and the preset surface of the component to be measured are all within the preset distance range.

[0013] The non-destructive testing sensor includes a plurality of the first magnetic sensitive elements and a plurality of the second magnetic sensitive elements, the first magnetic sensitive elements are arranged along the second direction Y, and the second magnetic sensitive elements are arranged along the second direction Y;

[0014] A plurality of the first magnetosensitive elements are welded to a first flexible circuit board. The length of the magnetosensitive element array in the second direction in the first flexible circuit board is less than the length of the first pole shoe in the second direction, and the length of the magnetosensitive element array in the first direction in the first flexible circuit board is less than the distance between the first pole shoe and the magnetic conductor in the first direction; the second direction is perpendicular to the first direction.

[0015] A plurality of the second magnetosensitive elements are welded to a second flexible circuit board. The length of the magnetosensitive element array in the first direction in the second flexible circuit board is less than the length of the second pole shoe in the first direction, and the length of the magnetosensitive element array in the second direction in the second flexible circuit board is less than the distance between the second pole shoe and the third pole shoe in the second direction.

[0016] Optionally, a plurality of the first magnetosensitive elements and a plurality of the second magnetosensitive elements are arranged in a staggered manner.

[0017] Optionally, the first flexible circuit board and the second flexible circuit board are parallel to a preset surface of the component to be measured.

[0018] Optionally, the bottom surface of the first pole shoe, the bottom surfaces of the second pole shoe and the third pole shoe are all parallel to a preset surface of the component to be measured.

[0019] Optionally, the first magnetosensitive element is a tunneling magnetoresistance element, a Hall element or a giant magnetoresistance element;

[0020] The second magnetosensitive element is a tunneling magnetoresistance element, a Hall element or a giant magnetoresistance element.

[0021] Optionally, the preset distance range is 0 mm - 5 mm.

[0022] Optionally, the upper yoke, the first permanent magnet, the first pole shoe, the second permanent magnet, the second pole shoe, the third permanent magnet, the third pole shoe, the magnetic conductor, at least one of the first magnetosensitive elements, and at least one of the second magnetosensitive elements are all encapsulated in a sensor housing.

[0023] The magnetic flux leakage detection sensor provided by the embodiment of the present invention includes an upper yoke, a first permanent magnet, a first pole shoe, a second permanent magnet, a second pole shoe, a third permanent magnet, a third pole shoe, a magnetic conductor, at least one first magnetic sensitive element, and at least one second magnetic sensitive element. The first permanent magnet is respectively connected to the front end portion of the upper yoke and the first pole shoe, the second permanent magnet is respectively connected to the left rear end portion of the upper yoke and the second pole shoe, the third permanent magnet is respectively connected to the right rear end portion of the upper yoke and the third pole shoe. At least one first magnetic sensitive element is disposed directly below the front portion of the upper yoke, and at least one second magnetic sensitive element is disposed directly below the rear portion of the upper yoke. The first magnetic sensitive element and the second magnetic sensitive element can be combined to detect crack defects at different angles. Since the first magnetic sensitive element is disposed directly below the front portion of the upper yoke, the magnetic field lines in the first magnetic sensitive element and the measured component at the corresponding position of the first magnetic sensitive element are all in the first direction X. The first magnetic sensitive element is more sensitive to crack defects with an angle close to the second direction Y. The magnetic field lines in the second magnetic sensitive element and the measured component at the corresponding position of the second magnetic sensitive element are all in the second direction Y. The second magnetic sensitive element is more sensitive to crack defects with an angle close to the first direction X. By combining the first magnetic sensitive element and the second magnetic sensitive element, crack defects at different angles can be detected, avoiding missed detection of crack defects and improving the detection accuracy. The magnetic flux leakage detection sensor provided by this embodiment has a simple structure, small volume, light weight, easy to operate and low energy consumption, reducing the detection cost.

[0024] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 is a schematic structural diagram of a magnetic flux leakage detection sensor provided by an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of the distribution of magnetic field lines in the measured component after the magnetic flux leakage detection sensor provided by the embodiment of the present invention magnetizes the measured component;

[0028] Figure 3 is a schematic diagram of the distribution of multiple crack defects with the same length, width and depth but different angles in the measured component;

[0029] Figure 4It is the waveform diagram of the signal output by the first magnetic sensitive element when detecting crack defects at different angles provided by the embodiment of the present invention;

[0030] Figure 5 It is the waveform diagram of the signal output by the second magnetic sensitive element when detecting crack defects at different angles provided by the embodiment of the present invention;

[0031] Figure 6 It is the layout schematic diagram of the first magnetic sensitive element in a magnetic flux leakage sensor provided by the embodiment of the present invention;

[0032] Figure 7 It is the layout schematic diagram of the second magnetic sensitive element in a magnetic flux leakage sensor provided by the embodiment of the present invention; Detailed implementation manners

[0033] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0035] Figure 1 It is the structural schematic diagram of a non-destructive testing sensor provided by the embodiment of the present invention. The magnetic flux leakage sensor includes: an upper yoke 1, a first permanent magnet 2, a first pole shoe 3, a second permanent magnet 4, a second pole shoe 5, a third permanent magnet 6, a third pole shoe 7, a magnetic conductor 8, at least one first magnetic sensitive element 9, and at least one second magnetic sensitive element 10;

[0036] The magnetic yoke includes an upper yoke 1, a first permanent magnet 2, a first pole shoe 3, a second permanent magnet 4, a second pole shoe 5, a third permanent magnet 6, and a third pole shoe 7;

[0037] The magnetic yoke is made of ferromagnetic material (such as carbon steel);

[0038] The magnetic conductor 8 is made of a ferromagnetic material (such as silicon steel) with a higher magnetic permeability than that of the yoke.

[0039] The top surface of the first permanent magnet 2 contacts the front bottom surface of the upper yoke iron 1, the top surface of the first pole shoe 3 contacts the bottom surface of the first permanent magnet 2, the top surface of the second permanent magnet 4 contacts the rear left bottom surface of the upper yoke iron 1, the top surface of the second pole shoe 5 contacts the bottom surface of the second permanent magnet 4, the top surface of the third permanent magnet 6 contacts the rear right bottom surface of the upper yoke iron 1, the top surface of the third pole shoe 7 contacts the bottom surface of the third permanent magnet 6, and the top surface of the magnetic conductor 8 contacts the middle left bottom surface of the upper yoke iron 1.

[0040] The magnetic poles on the top surface of the first permanent magnet 2 are the same as those on the top surface of the second permanent magnet 4, and the magnetic poles on the top surface of the first permanent magnet 2 are opposite to those on the top surface of the third permanent magnet 6.

[0041] At least one first magnetic sensor 9 is located below the front part of the upper yoke iron and is arranged between the first pole shoe 3 and the magnetic conductor 8. The sensitive direction of the first magnetic sensor 9 is the first direction X. At least one second magnetic sensor 10 is located below the rear part of the upper yoke iron 1 and is arranged between the second pole shoe 5 and the third pole shoe 7. The detection direction of the second magnetic sensor 10 is the second direction Y.

[0042] The distances between at least one first magnetic sensor 9, at least one second magnetic sensor 10 and the preset surface of the component to be measured are all within the preset distance range.

[0043] The top surface of the first permanent magnet 2 and the front bottom surface of the upper yoke iron 1 are attracted together by magnetic force. The top surface of the first pole shoe 3 and the bottom surface of the first permanent magnet 2 are attracted together by magnetic force. The top surface of the second permanent magnet 4 and the rear left bottom surface of the upper yoke iron 1 are attracted together by magnetic force. The top surface of the second pole shoe 5 and the bottom surface of the second permanent magnet 4 are attracted together by magnetic force. The top surface of the third permanent magnet 6 and the rear right bottom surface of the upper yoke iron 1 are attracted together by magnetic force. The top surface of the third pole shoe 7 and the bottom surface of the third permanent magnet 6 are attracted together by magnetic force. The top surface of the magnetic conductor 8 and the middle left bottom surface of the upper yoke iron 1 are attracted together by magnetic force. The length of the first pole shoe 3 along the second direction Y is the same as the length of the upper yoke iron 1 along the second direction Y. The length of the second pole shoe 5 along the first direction X is the same as the length of the third pole shoe 7 along the first direction X.

[0044] The component 11 to be measured can be the equipment to be detected, such as the weld of a wind turbine tower. The preset surface of the component 11 to be measured is the side of the component to be measured that is close to the non-destructive testing sensor. Optionally, the preset range is 0 mm - 5 mm. The non-destructive testing sensor can be directly located on the preset surface of the component 11 to be measured, or at a certain distance from the preset surface of the component 11 to be measured. The distance between the magnetosensitive element and the preset surface of the component 11 to be measured cannot be too far, so as to avoid the leakage magnetic field being too small and the signal output by the magnetosensitive element being weak due to the excessive distance, resulting in the missed detection of crack defects.

[0045] The first magnetosensitive element 9 is arranged directly below the front part of the upper yoke, and the second magnetosensitive element 10 is arranged directly below the rear part of the upper yoke, and the first magnetosensitive element 9 and the second magnetosensitive element 10 are set at a set distance from the side of the preset surface of the component 11 to be measured.

[0046] Exemplarily, when the preset surface of the component 11 to be measured is a plane, the vertical distances of the first magnetosensitive element 9 and the second magnetosensitive element 10 from the preset surface are the same. The magnetic poles on the top surface of the first permanent magnet 2 are the same as those on the top surface of the second permanent magnet 4, and the magnetic poles on the top surface of the first permanent magnet 2 are opposite to those on the top surface of the third permanent magnet 6. Exemplarily, the top surface of the first permanent magnet 2 is the S pole and the bottom surface is the N pole, the top surface of the second permanent magnet 4 is the S pole and the bottom surface is the N pole, the top surface of the third permanent magnet 6 is the N pole and the bottom surface is the S pole, or the top surface of the first permanent magnet 2 is the N pole and the bottom surface is the S pole, the top surface of the second permanent magnet 4 is the N pole and the bottom surface is the S pole, and the top surface of the third permanent magnet 6 is the S pole and the bottom surface is the N pole. In this embodiment, it is exemplarily shown that the top surface of the first permanent magnet 2 is the S pole and the bottom surface is the N pole, the top surface of the second permanent magnet 4 is the S pole and the bottom surface is the N pole, and the top surface of the third permanent magnet 6 is the N pole and the bottom surface is the S pole.

[0047] Figure 2 It is a schematic diagram of the magnetic field line distribution in the component to be measured after the magnetic flux leakage detection sensor provided by the embodiment of the present invention magnetizes the component to be measured. When performing the magnetic flux leakage detection of the component to be measured, a closed magnetic circuit is formed among the upper yoke 1, the first permanent magnet 2, the first pole shoe 3, the second permanent magnet 4, the second pole shoe 5, the third permanent magnet 6, the third pole shoe 7, and the magnetic conductor 8, and the magnetic field lines are transmitted in this closed magnetic circuit. The first magnetosensitive element 9 and the second magnetosensitive element 10 are located above the preset surface of the component 11 to be measured. When a crack defect occurs in the component 11 to be measured, the magnetic flux at the defect leaks into the air, and the leakage magnetic flux is acquired by the first magnetosensitive element 9 and the second magnetosensitive element 10, so as to judge the defect information of the component 11 to be measured.

[0048] Figure 3It is a distribution schematic diagram of multiple groove-shaped defects with the same length, width, and depth but different angles in the component under test. The component under test 11 is a flat defect specimen. Groove-shaped defects are used to simulate crack defects in actual detection. The sizes of the groove-shaped defects are the same, with a length of 10 mm, a width of 1 mm, and a depth of 1 mm. The angles range from 90° to 0°, with an interval of 15° for distribution.

[0049] Figure 4 It is a waveform diagram of the signal output by the first magnetic sensor 9 when detecting crack defects at different angles provided by the embodiment of the present invention; Figure 5 It is a waveform diagram of the signal output by the second magnetic sensor when detecting crack defects at different angles provided by the embodiment of the present invention. When using the magnetic flux leakage detection sensor to detect the component under test 11, the magnetic flux leakage sensor is controlled to move slowly to the right along the first direction X from the starting end of the component under test 11, that is, the leftmost end of the component under test 11 in the figure, for scanning. Figure 4 and Figure 5 The horizontal axes in both

[0050] are the distance of the component under test 11 from the starting end along the first direction X, with the unit of mm, and the vertical axes are the amplitudes of the signals output by the corresponding magnetic sensors, with the unit of V. It should be noted that the signal output by the magnetic sensor is a voltage value, and the output signal has passed through the post-stage signal conditioning circuit of the magnetic flux leakage sensor. The signal conditioning circuit has the functions of band-pass filtering and amplification. The band-pass filtering range is 1 - 100 Hz, and the amplification factor is about 50 times. The voltage value is proportional to the magnetic flux. Furthermore, whether magnetic flux leakage occurs is determined by the magnitude of the voltage value output by the magnetic sensor, and further whether there is a crack defect at the corresponding position of the component under test resulting in magnetic flux leakage is determined.

[0050] Refer to Figures 1 - 5 , at the first groove-shaped defect, that is, the position corresponding to the 90° groove-shaped defect, the amplitude of the signal output by the first magnetic sensor 9 is the largest. At the seventh groove-shaped defect, that is, the position corresponding to the 0° groove-shaped defect, the amplitude of the signal output by the first magnetic sensor 9 is the smallest. From the 90° groove-shaped defect to the 0° groove-shaped defect, the amplitude of the signal output by the first magnetic sensor 9 gradually becomes smaller. At the fourth groove-shaped defect, the fifth groove-shaped defect, the sixth groove-shaped defect, and the seventh groove-shaped defect, that is, at the 45° groove-shaped defect, the 30° groove-shaped defect, the 15° groove-shaped defect, and the 0° groove-shaped defect, the amplitude of the signal output by the second magnetic sensor 10 is relatively obvious. At the first groove-shaped defect, the second groove-shaped defect, and the third groove-shaped defect, that is, at the 90° groove-shaped defect, the 75° groove-shaped defect, and the 60° groove-shaped defect, the amplitude of the signal output by the second magnetic sensor 10 is smaller.

[0051] Figure 6It is a schematic layout diagram of the first magnetosensitive elements in a magnetic flux leakage sensor provided by an embodiment of the present invention. A plurality of first magnetosensitive elements 9 are arranged on the first flexible circuit board 11 and are arranged in a staggered manner.

[0052] Figure 7 It is a schematic layout diagram of the second magnetosensitive elements in a magnetic flux leakage sensor provided by an embodiment of the present invention. A plurality of second magnetosensitive elements 10 are arranged on the second flexible circuit board 12 and are arranged in a staggered manner.

[0053] It should be understood that various forms of the processes shown above can be used, steps can be reordered, added or deleted. For example, the steps described in the present invention can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is made herein.

[0054] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A magnetic flux leakage detection sensor based on a T-shaped magnetization field, characterized in that, Comprising: A T-shaped yoke, a magnetic conductor, at least one first magnetic sensor element, and at least one second magnetic sensor element; The T-shaped yoke includes an upper yoke iron, a first permanent magnet, a first pole shoe, a second permanent magnet, a second pole shoe, a third permanent magnet, and a third pole shoe; The top surface of the first permanent magnet contacts the bottom surface of the front part of the upper yoke iron, the top surface of the first pole shoe contacts the bottom surface of the first permanent magnet, the top surface of the second permanent magnet contacts the bottom surface of the left rear part of the upper yoke iron, the top surface of the second pole shoe contacts the bottom surface of the second permanent magnet, the top surface of the third permanent magnet contacts the bottom surface of the right rear part of the upper yoke iron, the top surface of the third pole shoe contacts the bottom surface of the third permanent magnet, the top surface of the magnetic conductor contacts the bottom surface of the left middle part of the upper yoke iron, and the distances from the bottom surfaces of the first pole shoe, the second pole shoe, and the third pole shoe to the preset surface of the measured component are all within a preset range; The magnetic conductor is made of a ferromagnetic material with a higher magnetic permeability than the yoke; The magnetic poles on the top surface of the first permanent magnet are the same as those on the top surface of the second permanent magnet, and the magnetic poles on the top surface of the first permanent magnet are opposite to those on the top surface of the third permanent magnet; At least one of the first magnetic sensor elements is located below the front part of the upper yoke iron and is arranged between the first pole shoe and the magnetic conductor, and the sensitive direction of the first magnetic sensor element is the first direction X. At least one of the second magnetic sensor elements is located below the rear part of the upper yoke iron and is arranged between the second pole shoe and the third pole shoe, and the detection direction of the second magnetic sensor element is the second direction Y; The distances between at least one of the first magnetic sensor elements, at least one of the second magnetic sensor elements and the preset surface of the measured component are all within the preset distance range.

2. The magnetic flux leakage detection sensor based on a T-shaped magnetization field according to claim 1, wherein Including a plurality of the first magnetic sensor elements and a plurality of the second magnetic sensor elements; A plurality of the first magnetic sensor elements are welded to a first flexible circuit board. The length of the magnetic sensor element array in the second direction in the first flexible circuit board is less than the length of the first pole shoe in the second direction, and the length of the magnetic sensor element array in the first direction in the first flexible circuit board is less than the distance between the first pole shoe and the magnetic conductor in the first direction; The second direction is perpendicular to the first direction; A plurality of the second magnetic sensor elements are welded to a second flexible circuit board. The length of the magnetic sensor element array in the first direction in the second flexible circuit board is less than the length of the second pole shoe in the first direction, and the length of the magnetic sensor element array in the second direction in the second flexible circuit board is less than the distance between the second pole shoe and the third pole shoe in the second direction.

3. The magnetic flux leakage detection sensor based on a T-shaped magnetization field according to claim 2, wherein A plurality of the first magnetic sensor elements and a plurality of the second magnetic sensor elements are all arranged in a staggered manner.

4. The magnetic flux leakage detection sensor based on a T-shaped magnetization field according to claim 2, wherein The first flexible circuit board and the second flexible circuit board are parallel to the preset surface of the measured component.

5. The magnetic flux leakage detection sensor based on a T-shaped magnetization field according to claim 1, characterized in that, The bottom surfaces of the first pole shoe, the second pole shoe, and the third pole shoe are all parallel to the preset surface of the measured component.

6. The magnetic flux leakage detection sensor based on a T-shaped magnetization field according to claim 1, characterized in that, The first magnetic sensor element is a tunneling magnetoresistance element, a Hall element, or a giant magnetoresistance element; The second magnetic sensor element is a tunneling magnetoresistance element, a Hall element, or a giant magnetoresistance element.

7. The magnetic flux leakage detection sensor according to claim 1, characterized in that, The preset distance range is 0 mm - 5 mm.

8. The magnetic flux leakage detection sensor according to claim 1, wherein The upper yoke, the first permanent magnet, the first pole shoe, the second permanent magnet, the second pole shoe, the third permanent magnet, the third pole shoe, the magnetic conductor, at least one of the first magnetic sensitive elements, and at least one of the second magnetic sensitive elements are all encapsulated in the sensor housing.

Images