CN210834762U - Signal receiving element for nondestructive testing sensor and sensor - Google Patents
Signal receiving element for nondestructive testing sensor and sensor Download PDFInfo
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- CN210834762U CN210834762U CN201921885421.1U CN201921885421U CN210834762U CN 210834762 U CN210834762 U CN 210834762U CN 201921885421 U CN201921885421 U CN 201921885421U CN 210834762 U CN210834762 U CN 210834762U
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Abstract
The signal receiving element comprises at least seven horizontal magnetoresistive elements on the same plane, at least three magnetoresistive elements are arranged end to end in a straight line, at least two magnetoresistive elements are arranged on two sides of the straight line formed by the three magnetoresistive elements respectively, and the magnetoresistive elements on each side are uniformly arranged on two sides of a perpendicular bisector of the straight line formed by the three magnetoresistive elements and form a certain included angle with the perpendicular bisector; the magnetic head further comprises a same number of vertical magnetoresistive elements which are vertically arranged with the long sides of the horizontal magnetoresistive elements, and each horizontal magnetoresistive element comprises a corresponding vertical magnetoresistive element; each pair of horizontal reluctance element and vertical reluctance element is fixed on the yoke plate through a fixing piece; the detection of the X direction and the Z direction of the magnetic field at each angle is realized, and the accuracy of the detection of cracks and stress is greatly improved.
Description
Technical Field
The disclosure relates to the technical field of nondestructive testing, in particular to a signal receiving element for a nondestructive testing sensor and the sensor.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Because modern mechanical equipment has complex operating environment and more damage types, and various nondestructive testing technologies have different advantages and defects and testing ranges, the integration of a plurality of testing technologies and the manufacture of multifunctional testing devices are important development trends of nondestructive testing, and scholars at home and abroad also develop a large amount of device researches to obtain primary results.
At present, multifunctional magnetic nondestructive detection sensors are less researched, which is an important development direction of future nondestructive detection, and a new detection method combining a certain magnetic technology with other nondestructive detection technologies has been researched. In the magnetic memory, magnetic flux leakage, and other detection methods, since the Y-direction component of the magnetic field does not change significantly, the signal is relatively random, and there is no tendency to be fixed, and the like, it has not been an object of intensive study, and on the contrary, the X-direction and Z-direction of the magnetic field have been the main points of detection.
The inventor of the present disclosure finds that (1) there is no matched signal receiving element specially used for detecting the X direction and the Z direction of the magnetic field; (2) most of the magnetoresistive elements are unidirectional detection elements, and multi-angle detection of a magnetic field cannot be realized.
Disclosure of Invention
In order to solve the deficiency of prior art, this disclosure provides a signal receiving element and sensor for nondestructive test sensor, has realized the X direction and the Z direction's of the magnetic field of each angle detection, very big improvement to the degree of accuracy of the detection of crack and stress.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a first aspect of the present disclosure provides a signal receiving element for a non-destructive testing sensor.
A signal receiving element for a nondestructive testing sensor comprises at least seven horizontal magnetoresistive elements on the same plane, at least three magnetoresistive elements are arranged end to end in a straight line, at least two magnetoresistive elements are arranged on two sides of the straight line formed by the three magnetoresistive elements respectively, and the magnetoresistive elements on each side are uniformly arranged on two sides of a perpendicular bisector of the straight line formed by the three magnetoresistive elements and form a certain included angle with the perpendicular bisector;
the magnetic head further comprises a same number of vertical magnetoresistive elements which are vertically arranged with the long sides of the horizontal magnetoresistive elements, and each horizontal magnetoresistive element comprises a corresponding vertical magnetoresistive element; each pair of the horizontal magnetoresistive element and the vertical magnetoresistive element is fixed to the yoke plate by a fixing member.
As some possible implementation manners, the signal receiving element includes seven horizontal magnetoresistive elements, wherein three magnetoresistive elements are arranged end to end in a straight line, two magnetoresistive elements are respectively arranged on two sides of the straight line, the two magnetoresistive elements are respectively arranged on two sides of the perpendicular bisector, and the long sides of the two magnetoresistive elements form an included angle of 45 degrees with the perpendicular bisector.
As some possible implementations, the horizontal magnetoresistive element and the vertical magnetoresistive element are both rectangular elements, and are each fixed on a rectangular plate, the long sides of the horizontal magnetoresistive element and the vertical magnetoresistive element are both parallel to the short side of the corresponding rectangular fixing plate, and the lengths of the long sides of the horizontal magnetoresistive element and the vertical magnetoresistive element are both less than or equal to the length of the short side of the corresponding rectangular fixing plate.
As some possible implementation manners, the fixing member includes brackets and butterfly fixing plates, a horizontal reluctance element and a vertical reluctance element are disposed on each bracket, the fixing members are sequentially arranged on the butterfly fixing plates, and the butterfly fixing plates are fixedly connected with the yoke plates.
As a further limitation, the bracket comprises a first L-shaped plate and a second L-shaped plate which are parallel to each other and are arranged oppositely and have the same size, the vertical edges of the vertical arms of the first L-shaped plate and the second L-shaped plate are flush and are connected through a first rectangular plate, the widths of the vertical arms of the first L-shaped plate and the second L-shaped plate are both greater than the length of the long side of the rectangular fixing plate of the magneto-resistive element, and the lengths of the cross arms of the first L-shaped plate and the second L-shaped plate are greater than the thickness of the rectangular fixing plate of the magneto-resistive element;
the transverse edges of the vertical arms of the first L-shaped plate and the second L-shaped plate are flush, and the rectangular fixing plate of the horizontal magnetoresistive element is horizontally arranged on the upper sides of the vertical arms of the first L-shaped plate and the second L-shaped plate; the outer edges of the cross arms of the first L-shaped plate and the second L-shaped plate are flush, and the rectangular fixing plate of the vertical magneto-resistive element is vertically arranged on the upper sides of the cross arms of the first L-shaped plate and the second L-shaped plate.
By way of further limitation, the vertical arm width and the cross arm height of the first L-shaped plate and the second L-shaped plate are the same.
As a further limitation, the distance between the outer edges of the upper sides of the vertical arms of the first L-shaped plate and the second L-shaped plate is equal to the length of the short side of the rectangular fixing plate.
As a further limitation, the distance between the outer edges of the upper sides of the cross arms of the first L-shaped plate and the second L-shaped plate is equal to the length of the short side of the rectangular fixing plate.
By way of further limitation, the length of the upper side of the cross arm of the first L-shaped plate and the second L-shaped plate is greater than or equal to the sum of the thicknesses of the vertical magnetoresistive elements and the rectangular fixing plates thereof.
The second aspect of the present disclosure provides a nondestructive detection sensor, including the signal receiving element and the magnetization element of the first aspect of the present disclosure, the magnetization element includes six excitation coils and yoke plates, a nylon skeleton, a magnetic core and pole shoes corresponding to the six excitation coils, the yoke plates are circular yoke plates, the magnetic core is disposed inside the nylon skeleton, one end of the nylon skeleton is fixed on the yoke plates, the other end of the nylon skeleton is fixed with the pole shoes, the six nylon skeletons are uniformly fixed on the upper surface of the circular yoke plates, the excitation coils are wound on the nylon skeleton, and the polarities of two adjacent excitation coils are opposite;
the signal receiving element is arranged in a space defined by the six excitation coils and is fixed on the magnetic yoke plate through a fixing piece, the magnetic yoke plate is fixed on the support frame, and the support frame is used for being fixed with the moving device to realize movement detection on the test piece.
Compared with the prior art, the beneficial effect of this disclosure is:
1. the signal receiving unit can effectively identify the magnetic field components in all directions in a large area, theoretically covers 360 degrees, realizes the detection of the X direction and the Z direction of the magnetic field at all angles, and greatly improves the accuracy of the detection of cracks and stress.
2. The bracket is of a hollow structure, so that the influence on magnetic lines is greatly reduced, and the induction capability of the magnetoresistive element on the magnetic lines is improved.
3. The support is composed of L-shaped plates with the same size, and arrangement without dead angles can be achieved during arrangement, so that linear arrangement of the plurality of magnetoresistive elements can be guaranteed.
4. The butterfly-shaped fixing plate is compact in structure, the compact arrangement among seven brackets can be realized, and the volume of a signal receiving unit is greatly reduced.
Drawings
Fig. 1 is a schematic diagram of the arrangement of all the magnetoresistive elements described in embodiment 1 of the present disclosure.
Fig. 2 is a schematic view of a stent structure according to embodiment 1 of the present disclosure.
Fig. 3 is a schematic structural view of a butterfly-shaped fixing plate according to embodiment 1 of the present disclosure.
Fig. 4 is a schematic structural diagram of a nondestructive testing sensor according to embodiment 2 of the present disclosure.
Fig. 5 is a schematic diagram of the operation of the nondestructive testing sensor in the embodiment 2 of the present disclosure.
1-a first magnetoresistive element; 2-a second magnetoresistive element; 3-a third magnetoresistive element; 4-a fourth magnetoresistive element; 5-a fifth magnetoresistive element; 6-sixth magnetoresistive element; 7-a seventh magnetoresistive element; 8-eighth magnetoresistive element; 9-ninth magnetoresistive element; 10-tenth magnetoresistive element; 11-an eleventh magnetoresistive element; 12-a twelfth magnetoresistive element; 13-a thirteenth magnetoresistive element; 14-a fourteenth magnetoresistive element; 15-a first L-shaped plate; 16-a second L-shaped plate; 17-a horizontal magnetoresistive element; 18-a first rectangular fixing plate; 19-a vertical magnetoresistive element; 20-a second rectangular fixing plate; 21-a magnetoresistive element; 22-pole shoe; 23-a scaffold; 24-nylon backbone; 25-a magnetic core; 26-a yoke plate; 27-a support frame; 28-butterfly shaped fixing plate.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Example 1:
as shown in fig. 1, embodiment 1 of the present disclosure provides a signal receiving element for a nondestructive testing sensor, where the signal receiving element includes seven horizontal magnetoresistive elements 17 in the same plane, namely, a first magnetoresistive element 1, a third magnetoresistive element 3, a fifth magnetoresistive element 5, a seventh magnetoresistive element 7, a ninth magnetoresistive element 9, an eleventh magnetoresistive element 11, and a fourteenth magnetoresistive element, for detecting a magnetic signal in an X direction, the three magnetoresistive elements (the first, third, and fifth magnetoresistive elements) are arranged end to end in a straight line, two magnetoresistive elements are respectively disposed on two sides of the straight line formed by the three magnetoresistive elements, namely, the first magnetoresistive element, the eleventh magnetoresistive element, the ninth magnetoresistive element, and the fourteenth magnetoresistive element, the two magnetoresistive elements on each side are uniformly disposed on two sides of a perpendicular bisector of the straight line formed by the three magnetoresistive elements, and form an angle of 45 ° with the perpendicular bisector, that is, the first magnetoresistive element and the eleventh magnetoresistive element both have an angle of 45 ° with the perpendicular bisector, and the ninth magnetoresistive element and the fourteenth magnetoresistive element both have an angle of 45 ° with the perpendicular bisector, and may have other angles within a range of 10 ° to 80 °.
The magnetic head further comprises an equal number of vertical magnetoresistive elements 19 which are arranged perpendicular to the long sides of the horizontal magnetoresistive elements, namely a second magnetoresistive element 2, a fourth magnetoresistive element 4, a sixth magnetoresistive element 6, an eighth magnetoresistive element 8, a tenth magnetoresistive element 10, a twelfth magnetoresistive element 12 and a thirteenth magnetoresistive element 13, wherein each horizontal magnetoresistive element 17 comprises a corresponding vertical magnetoresistive element 19, and each pair of horizontal magnetoresistive element 17 and vertical magnetoresistive element 19 is fixed on the yoke plate through a fixing member.
The horizontal magnetic resistance element 17 and the vertical magnetic resistance element 19 are both rectangular elements, and are respectively fixed on a rectangular plate, namely a first rectangular fixing plate 18 and a second rectangular fixing plate 20, the long sides of the horizontal magnetic resistance element 17 and the vertical magnetic resistance element 19 are both parallel to the short sides of the corresponding rectangular fixing plates (18, 20), and the lengths of the long sides of the horizontal magnetic resistance element and the vertical magnetic resistance element are both smaller than or equal to the lengths of the short sides of the corresponding rectangular fixing plates (18, 20).
The fixing piece comprises brackets and butterfly fixing plates, wherein each bracket is provided with a horizontal reluctance element and a vertical reluctance element, the fixing pieces are sequentially arranged on the butterfly fixing plates, the butterfly fixing plates are fixedly connected with the yoke plates, and the butterfly fixing plates are shown in figure 3.
As shown in fig. 2, the bracket includes a first L-shaped plate 15 and a second L-shaped plate 16 which are parallel to each other and are arranged oppositely, and have the same size, and both the first L-shaped plate and the second L-shaped plate have a certain thickness, the vertical edges of the vertical arms of the first L-shaped plate 15 and the second L-shaped plate 16 are flush and connected through a first rectangular plate, the widths of the vertical arms of the first L-shaped plate and the second L-shaped plate are both greater than the length of the long side of the rectangular fixing plate of the corresponding magneto resistive element, and the length of the cross arm of the first L-shaped plate and the second L-shaped plate is greater than the thickness of the rectangular fixing plate of the corresponding;
the transverse edges of the vertical arms of the first L-shaped plate 15 and the second L-shaped plate 16 are flush, and the first rectangular fixing plate 18 is horizontally arranged on the upper sides of the vertical arms of the first L-shaped plate 15 and the second L-shaped plate 16; the outer edges of the cross arms of the first L-shaped plate 15 and the second L-shaped plate 16 are flush, and the second rectangular fixing plate 20 of the vertical reluctance element 19 is vertically arranged on the upper side of the cross arms of the first L-shaped plate 15 and the second L-shaped plate 16.
The horizontal magnetoresistive element 17 and the vertical magnetoresistive element 19 are both rectangular elements, long sides of the horizontal magnetoresistive element 17 and the vertical magnetoresistive element 19 are both parallel to short sides of the corresponding rectangular fixing plate, and lengths of the long sides of the horizontal magnetoresistive element 17 and the vertical magnetoresistive element 19 are both smaller than or equal to lengths of the short sides of the corresponding rectangular fixing plate.
One long side of the first rectangular fixing plate is flush with the transverse outer edge of the upper side of the vertical arm of the first L-shaped plate, and the other long side of the first rectangular fixing plate is flush with the transverse outer edge of the upper side of the vertical arm of the second L-shaped plate. One long edge of the second rectangular fixing plate is flush with the vertical edge of the vertical arm of the first L-shaped plate, and the other long edge of the second rectangular fixing plate is flush with the vertical outer edge of the second L-shaped plate.
The vertical arm width and the cross arm height of the first L-shaped plate 15 and the second L-shaped plate 16 are the same.
The distance between the outer edges of the upper sides of the vertical arms of the first L-shaped plate 15 and the second L-shaped plate 16 is equal to the length of the short side of the first rectangular fixing plate or the second rectangular fixing plate.
The distance between the outer edges of the upper sides of the cross arms of the first L-shaped plate 15 and the second L-shaped plate 16 is equal to the length of the short side of the first rectangular fixing plate or the second rectangular fixing plate.
The length of the upper side of the cross arm of the first L-shaped plate 15 and the second L-shaped plate 16 is greater than or equal to the sum of the thicknesses of the vertical magnetoresistive element 19 and the second rectangular fixing plate 20.
Example 2:
as shown in fig. 4, an embodiment 2 of the present disclosure provides a multifunctional nondestructive testing sensor, including the signal receiving element and the magnetization element described in embodiment 1, where the signal receiving element includes a plurality of magnetoresistive elements 21 arranged in sequence, the magnetization element includes six excitation coils and yoke plates 26, nylon frames 24, magnetic cores 25 and pole shoes 22 corresponding to the excitation coils, the yoke plates 26 are circular yoke plates, the magnetic cores 25 are disposed inside the nylon frames 4, one end of each nylon frame 4 is fixed on the yoke plate 26, the other end of each nylon frame is fixed with the pole shoe 22, the six nylon frames 24 are uniformly fixed on the upper surface of the circular yoke plate, the nylon frames 24 are wound with the excitation coils, and the polarities of two adjacent excitation coils are opposite;
the signal receiving element further comprises a same number of vertical magnetoresistive elements which are perpendicular to the long sides of the horizontal magnetoresistive elements and used for detecting the magnetic signals in the Z direction, and each horizontal magnetoresistive element comprises a corresponding vertical magnetoresistive element.
The signal receiving element is arranged in a space defined by six excitation coils and fixed on a yoke plate through a fixing piece, the yoke plate 26 is fixed on a support frame 27, and the support frame 27 is used for being fixed with a moving device to realize movement detection on a test piece.
The fixing piece comprises a bracket 23 and a butterfly fixing plate 28, each support 23 is used for placing a horizontal reluctance element and a vertical reluctance element, the supports are fixed in the butterfly fixing plate 28, and the butterfly fixing plate 28 is fixedly connected with the yoke plate 26.
Each excitation coil is formed by winding a plurality of circles of enameled wires with the diameter of 0.23mm on a nylon skeleton, two adjacent excitation coils are wound by the same enameled wire in opposite directions, sinusoidal excitation signals with the phases of 120 degrees are introduced into three groups of coils, each group of coils generates a closed variable magnetic field, and the three groups of magnetic fields are mutually coupled to finally form a rotating magnetic field with the direction changing.
The signal generating and controlling module described in this embodiment synthesizes a three-phase excitation signal by using a DDS principle, and a single chip microcomputer and a DAC control signal parameter, a liquid crystal display, and the like, or generates a three-phase excitation signal by using a dedicated DDS chip, and a person skilled in the art can select the three-phase excitation signal by himself. Under the sine excitation of three different phases, the magnetic field on the surface of the test piece gradually rotates along the anticlockwise direction, when the crack direction and the scanning direction form any angle, the rotating magnetic field can be always vertical to the crack at a certain moment, the sensitivity of magnetic memory or magnetic leakage detection is improved under the condition of weak magnetism, and the limit on the crack direction is broken through.
The magneto-resistive element described in this embodiment is a magneto-resistive element of an HMC1021 model, can measure the magnetic field change in one direction, has high sensitivity, can detect a weak magnetic field on the surface of a workpiece, and has an accurate detection result. The volume of the magnetic resistance element is small, the sensor probe is convenient to manufacture, the volume of the probe is reduced, and a complex non-planar workpiece can be detected. The HMC1021 magnetoresistive element is all solid-state, has low inherent impedance, and has high noise and interference resistance, thereby having high reliability. The HMC1021 magnetoresistive element converts the magnetic signal into a voltage signal for output, and a UA306A acquisition card is selected for analog-to-digital conversion, and those skilled in the art may select other types of acquisition cards according to the sensor structure described in this embodiment.
As shown in FIG. 5, the most commonly used ferromagnetic material 45 steel was used to make the experimental test piece, which had a length of 400mm, a width of 200mm and a thickness of 10 mm.
With the sensor described in this embodiment, cracks in different directions are analyzed based on the rotating magnetic field by magnetic memory detection and magnetic flux leakage detection, and stress is analyzed by magnetic memory detection and barkhausen noise detection.
The excitation frequency is selected to be 4Hz in magnetic memory detection and magnetic leakage detection, the excitation frequency is selected to be 40Hz in Barkhausen noise detection, the magnetic memory detection needs weak magnetic field excitation, the power amplifier output voltage is adjusted to be 2V, the Barkhausen noise detection and magnetic leakage detection adopts a slightly strong magnetic field to improve the detection effect, and the excitation voltage is selected to be 6V.
The method comprises the steps of processing 7 rectangular cracks with different angles on the surface of a test piece through an electric spark engraving machine, wherein the rectangular cracks are respectively 0 degree, 15 degrees, 30 degrees, 45 degrees, 60 degrees, 75 degrees and 90 degrees, the sizes of the cracks are 40mm in length, 0.5mm in width and 0.5mm in depth, and a stress concentration area is manufactured through a local quenching mode.
The sensor probe is placed on the upper part of the test piece, stress concentration can be easily detected by observing an X-direction magnetic memory detection signal, and the three magnetic resistance elements in a straight line are very sensitive to a stress band on the test piece.
The position and the direction of a stress zone can be distinguished through three horizontal magnetoresistive elements which are in the middle of the stress zone, the larger the included angle between the crack direction and the magnetoresistive elements is, the stronger the X-direction magnetic signal received by the magnetoresistive elements is, the X-direction magnetic signal received by each magnetoresistive element can realize the detection of the position and the direction of the crack, and the preliminary quantitative analysis of the surface of a test piece can be realized subsequently by the detection and the recording of the Z-direction signal.
The signal recording method and the subsequent data processing method described in this embodiment both adopt the existing methods, which is not the innovative point of the present invention, and the content of the above methods is only used for introducing the working principle of the sensor described in this embodiment, and has no limiting effect.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. The signal receiving element for the nondestructive testing sensor is characterized by comprising at least seven horizontal magnetoresistive elements in the same plane, wherein the at least three magnetoresistive elements are arranged end to end in a straight line, at least two magnetoresistive elements are respectively arranged on two sides of the straight line formed by the three magnetoresistive elements, and the magnetoresistive elements on each side are uniformly arranged on two sides of a perpendicular bisector of the straight line formed by the three magnetoresistive elements and form a certain included angle with the perpendicular bisector;
the magnetic head further comprises a same number of vertical magnetoresistive elements which are vertically arranged with the long sides of the horizontal magnetoresistive elements, and each horizontal magnetoresistive element comprises a corresponding vertical magnetoresistive element; each pair of the horizontal magnetoresistive element and the vertical magnetoresistive element is fixed to the yoke plate by a fixing member.
2. The signal receiving element for a nondestructive inspection sensor of claim 1, comprising seven horizontal magnetoresistive elements, wherein three magnetoresistive elements are arranged end to end in a straight line, two magnetoresistive elements are disposed on either side of the perpendicular bisector, and the long sides of the two magnetoresistive elements are each at an angle of 45 ° to the perpendicular bisector.
3. The signal receiving element for a nondestructive inspection sensor according to claim 1, wherein the horizontal magnetoresistive element and the vertical magnetoresistive element are rectangular elements each fixed on one rectangular plate, long sides of the horizontal magnetoresistive element and the vertical magnetoresistive element are parallel to short sides of the respective rectangular fixed plates, and lengths of the long sides of the horizontal magnetoresistive element and the vertical magnetoresistive element are each less than or equal to a length of the short sides of the respective rectangular fixed plates.
4. The signal receiving element for a nondestructive inspection sensor according to claim 1, wherein the fixing member comprises supports each provided with one horizontal magnetoresistive element and one vertical magnetoresistive element, and butterfly-shaped fixing plates on which the fixing member is arranged in turn, the butterfly-shaped fixing plates being fixedly connected to the yoke plate.
5. The signal receiving element for the nondestructive inspection sensor according to claim 4, wherein the holder comprises a first L-shaped plate and a second L-shaped plate which are equal in size and are disposed in parallel and opposite to each other, vertical edges of vertical arms of the first L-shaped plate and the second L-shaped plate are flush and are connected through a first rectangular plate, widths of the vertical arms of the first L-shaped plate and the second L-shaped plate are both larger than lengths of long sides of the rectangular fixing plate of the magneto resistive element, and lengths of cross arms of the first L-shaped plate and the second L-shaped plate are larger than thicknesses of the rectangular fixing plate of the magneto resistive element;
the transverse edges of the vertical arms of the first L-shaped plate and the second L-shaped plate are flush, and the rectangular fixing plate of the horizontal magnetoresistive element is horizontally arranged on the upper sides of the vertical arms of the first L-shaped plate and the second L-shaped plate; the outer edges of the cross arms of the first L-shaped plate and the second L-shaped plate are flush, and the rectangular fixing plate of the vertical magneto-resistive element is vertically arranged on the upper sides of the cross arms of the first L-shaped plate and the second L-shaped plate.
6. The signal receiving element for a nondestructive inspection sensor of claim 5 wherein said first and second L-shaped plates have a vertical arm width and a horizontal arm height that are the same.
7. The signal receiving element for a nondestructive inspection sensor according to claim 1, wherein a distance between outer edges of upper sides of the vertical arms of the first and second L-shaped plates is equal to a length of a short side of the rectangular fixing plate.
8. The signal receiving element for a nondestructive inspection sensor according to claim 1, wherein a distance between outer edges of upper sides of the lateral arms of the first and second L-shaped plates is equal to a length of a short side of the rectangular fixing plate.
9. The signal receiving element for a nondestructive inspection sensor of claim 1 wherein the length of the upper side of the cross arm of the first L-shaped plate and the second L-shaped plate is greater than or equal to the sum of the thickness of the vertical magnetoresistive element and its rectangular fixed plate.
10. A nondestructive testing sensor, comprising the signal receiving element and the magnetizing element of any one of claims 1 to 9, wherein the magnetizing element comprises six excitation coils and corresponding yoke plates, a nylon skeleton, a magnetic core and pole shoes, the yoke plates are circular yoke plates, the magnetic core is arranged inside the nylon skeleton, one end of the nylon skeleton is fixed on the yoke plates, the other end of the nylon skeleton is fixed with the pole shoes, the six nylon skeletons are uniformly fixed on the upper surface of the circular yoke plates, the excitation coils are wound on the nylon skeleton, and the polarities of two adjacent excitation coils are opposite;
the signal receiving element is arranged in a space defined by the six excitation coils and is fixed on the magnetic yoke plate through a fixing piece, the magnetic yoke plate is fixed on the support frame, and the support frame is used for being fixed with the moving device to realize movement detection on the test piece.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113092576A (en) * | 2021-05-28 | 2021-07-09 | 西安热工研究院有限公司 | Metal magnetic memory detection device under excitation of weak magnetic field and use method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113092576A (en) * | 2021-05-28 | 2021-07-09 | 西安热工研究院有限公司 | Metal magnetic memory detection device under excitation of weak magnetic field and use method thereof |
| CN113092576B (en) * | 2021-05-28 | 2024-04-30 | 西安热工研究院有限公司 | Metal magnetic memory detection device under weak magnetic field excitation and application method thereof |
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