A detection method and detection system device of moving speed of array eddy current probe

Abstract

The present invention discloses a detection method for the moving speed of an array eddy current probe and a detection system device thereof, which are used to detect and calculate the displacement speed between the array eddy current probe and the detection object, and the eddy current detection probe has a plurality of identical eddy current sensor units arranged in an array, and includes two steps of detection signal image processing and moving speed calculation. The eddy current detection probe can calculate the displacement speed without adding an additional detection displacement sensor device, which is more conducive to the integration and simplification of the array eddy current detection sensor probe.

Description

Technical Field

[0001] The present invention relates to the field of nondestructive testing technology, in particular to array eddy current testing probe technology, and in particular to a detection method for the moving speed of an array eddy current probe and a detection system device thereof. Background Art

[0002] Eddy current testing, as a simple and high-precision electromagnetic non-destructive testing, is increasingly recognized in the current industrial production. In order to achieve large-area testing and adapt to various testing surfaces, the application of array eddy current probes is becoming more and more extensive. In industrial production applications, many occasions require mobile scanning testing, or the test object is mobile. Array eddy current scanning testing generates a test parameter image. In many cases, it is necessary to simultaneously collect large-scale displacements of the workpiece being tested during the scanning process. At present, it is generally measured by connecting a rotary encoder to a passive wheel. However, the factory production and application environment is generally more complex. In the government's encouragement of automated production improvements, many on-site automation settings are installed in existing equipment. Each application scenario is also different. To install a passive wheel displacement measurement device on the original production application equipment, the probe structure equipment will become quite complex and not easy to implement.

[0003] Therefore, there is an urgent need to implement more functions in software to improve and simplify complex production application equipment and realize automation and intelligence of production to a greater extent. Similarly, realizing more functions of eddy current detection probes through program software calculation and analysis, simplifying the hardware equipment of eddy current detection equipment, and making eddy current detection probes more widely used in modern production and detection applications is also a major trend in the current non-destructive testing industry to adapt to market demand.

[0004] In view of the above shortcomings, the present invention adopts the following technical solutions. Summary of the invention

[0005] The purpose of the present invention is to provide a method for detecting the moving speed of an array eddy current probe and a detection system device thereof. The disclosed technical solution is as follows:

[0006] A method for detecting the moving speed of an array eddy current probe is used to detect and calculate the displacement speed between the array eddy current probe and the detection object. The eddy current detection probe has multiple identical eddy current sensor units arranged in an array. The method includes two steps: detection signal image processing and moving speed calculation. The specific method steps are as follows:

[0007] Detection signal image processing steps:

[0008] a1. Sorting and numbering of eddy current sensor units: according to the physical position of each sensor unit on the eddy current probe device, the arrayed eddy current sensor units are arranged in a regular numbering sequence, and the sampling signal of each sensor unit corresponds to the number;

[0009] b1. Sensor unit physical position distance collection: collect the distance value (△S) between each sensor unit;

[0010] c1. Signal image processing: The detection signal of each eddy current sensor unit is amplified and image processed. Each processed and calculated image corresponds to the number in step a1;

[0011] Moving speed calculation steps:

[0012] a2. Image matching: collect images over a long period of time for the numbered images obtained in step c1, move them on the time axis to compare the similarity, and if the images are the same or the similarity reaches the calibration range, collect the relevant eddy current sensor unit numbers and detection signal images;

[0013] b2. Calculate the time difference: number the eddy current sensor units collected in step a2, and calculate the time interval (△T) on the detection signal image;

[0014] c2. Calculate the displacement speed: The displacement speed V is obtained by dividing the physical distance value (△S) between the sensor units corresponding to each other by the time interval (△T) on the corresponding image, that is, V= , multiple △S and △T can be collected to calculate multiple V values ​​and calculate the average value.

[0015] And, it also includes a method for determining the moving direction, wherein the sensor units of the array eddy current probe are sequentially numbered to set the sensor unit at the center point of the probe as the origin for calculation and determination, and another reference sensor unit that has the highest image matching similarity with the origin sensor unit and has a positive time interval (△T) difference and the smallest time interval (△T) and physical position distance value (△S) is determined to be the direction of the displacement velocity in the direction in which it moves to the origin sensor in the physical position.

[0016] All sensor units of the array eddy current probe are on the same horizontal plane, and the data detected and analyzed are movement data information in the same plane direction.

[0017] Or in another implementation structure, all sensor units of the array eddy current probe are arranged on different horizontal planes to ensure that the effective detection range is fully covered, thereby improving the stability of the image matching result.

[0018] When all sensor units of the array eddy current probe are set as multi-layer array planar spiral coils, the physical size of the sensor is larger than the size of the sensor detection range, and a multi-layer staggered arrangement is adopted to achieve full coverage of the planar detection range.

[0019] Furthermore, all sensor units of the array eddy current probe are distributed on different horizontal planes, and the detected and analyzed data also include data information of longitudinal displacement.

[0020] When all sensor units of the array eddy current probe are set as multi-layer array planar spiral coils, the sensor unit at the middlemost sensor unit position in the middle layer is used as the origin of calculation and judgment. Another reference sensor unit with the highest image matching similarity with the origin sensor unit, a positive time interval (△T) difference, and the smallest time interval (△T) and physical position distance value (△S) is moved to the direction of the posture vector of the origin sensor unit in physical position, and the displacement direction is determined to be the longitudinal plus transverse synthesis of the displacement velocity.

[0021] The image matching method includes one or both of extracting the identification of the detection object or the defect feature part for comparison and comparing the part of the image over a period of time.

[0022] The present invention also discloses a sensor device for detecting the moving speed of an array eddy current probe, which comprises a plurality of sensor units arranged in an array, and is characterized in that the arrangement structure of the plurality of sensor units is configured to have a central sensor unit as an origin, and the other sensor units are arranged radially and sequentially around the origin as the center.

[0023] The sensor device is arranged to be composed of a plurality of planar spiral coil sensor units arranged in an array of more than three layers, wherein a sensor unit at the center of an intermediate layer is the origin, forming a radially sequentially arranged structure.

[0024] The present invention also discloses a detection system for the moving speed of an array eddy current probe, which is characterized by comprising a data storage unit (30), a detection signal processing unit (31) and a speed calculation unit (32); wherein: the data storage unit (30) is used to store detection data and all image data for analysis and calculation; the detection signal processing unit (31) comprises an eddy current sensor unit numbering module (311) for imaging the detection signal, a detection signal image processing module (312) for sequentially numbering the sensor units corresponding to the collected signal, and a sensor unit physical position information collection module (313) for collecting the physical position information of the corresponding sensor units; the speed calculation unit (32) comprises an image matching module (321) for performing similarity comparison on images detected by each sensor unit, a time difference calculation module (322) for calculating the image time interval, and a displacement speed calculation module (323).

[0025] The invention also includes a movement direction determination unit (33) for determining the displacement direction between the eddy current probe and the object to be detected, including a plane translation direction determination module (331) for determining the relative displacement direction on a plane, a longitudinal movement determination module (332) for determining the vertical displacement between the eddy current probe and the object to be detected, and a posture vector calculation determination module (333) for determining the relative posture between the eddy current probe and the object to be detected.

[0026] According to the above technical scheme, the present invention has the following beneficial effects:.

[0027] 1. The present invention uses the same or similar time difference of the detection signal images of the array sensor units within a unit time and the physical position of the sensor units to perform number identification and calculate the displacement speed through a calculation program, so that the eddy current detection probe can calculate the displacement speed without adding an additional detection displacement sensor device, which is more conducive to the integration and simplification of the array eddy current detection sensor probe;

[0028] Second, the present invention determines the moving direction by calculating and determining the shortest physical position corresponding to the closest detection signal image of the array sensor unit and the shortest time difference of the detection signal image;

[0029] 3. The present invention uses a stack of multi-layer array sensor devices to calculate and determine the speed and direction of the three-dimensional translation and rotation displacement in the relative displacement between the array eddy current probe and the object to be detected in three-dimensional space. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of a flow chart of a preferred embodiment of the present invention;

[0031] Figure 2 A schematic diagram of the method calculation of the best embodiment of the present invention;

[0032] Figure 3 A schematic diagram of a method for calculating another sensor unit array structure according to a preferred embodiment of the present invention;

[0033] Figure 4 A schematic diagram of image matching in the best embodiment of the present invention;

[0034] Figure 5 A structural schematic diagram of the best embodiment of the present invention;

[0035] Figure 6 A schematic diagram of calculating the time difference in the moving direction according to the best embodiment of the present invention;

[0036] Figure 7 A schematic diagram of another moving direction time difference calculation according to the best embodiment of the present invention;

[0037] Figure 8 A schematic diagram of another moving direction time difference calculation according to the best embodiment of the present invention;

[0038] Fig. 9 A schematic diagram of the arrangement of array sensor units according to the best embodiment of the present invention;

[0039] Fig.10 A schematic diagram of the arrangement of array sensor units according to the best embodiment of the present invention;

[0040] Fig.11 A schematic diagram of the arrangement of array sensor units according to the best embodiment of the present invention;

[0041] Fig.12 A schematic diagram of the arrangement of array sensor units according to the best embodiment of the present invention;

[0042] Fig.13 A schematic diagram of the arrangement of array sensor units according to the best embodiment of the present invention;

[0043] Fig.14 A schematic diagram of the arrangement of array sensor units according to the best embodiment of the present invention;

[0044] Fig.15 A schematic diagram of the arrangement of array sensor units according to the best embodiment of the present invention;

[0045] Fig.16 Schematic diagram of system modules of the best embodiment of the present invention. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0047] like Figures 2 to 7 As shown, a method for detecting the moving speed of an array eddy current probe is used to detect and calculate the displacement speed between the array eddy current probe and the detection object. The eddy current detection probe has multiple identical eddy current sensor units arranged in an array, including two steps of detection signal image processing and moving speed calculation. The specific method steps are as follows:

[0048] Detection signal image processing steps:

[0049] a1. Sorting and numbering of eddy current sensor units: according to the physical position of each sensor unit on the eddy current probe device, the arrayed eddy current sensor units are arranged in a regular numbering sequence, and the sampling signal of each sensor unit corresponds to the number;

[0050] b1. Sensor unit physical position distance collection: collect the distance value (△S) between each sensor unit;

[0051] c1. Signal image processing: The detection signal of each eddy current sensor unit is amplified and image processed. Each processed and calculated image corresponds to the number in step a1;

[0052] Moving speed calculation steps:

[0053] a2. Image matching: collect images over a long period of time for the numbered images obtained in step c1, move them on the time axis to compare the similarity, and if the images are the same or the similarity reaches the calibration range, collect the relevant eddy current sensor unit numbers and detection signal images;

[0054] b2. Calculate the time difference: number the eddy current sensor units collected in step a2, and calculate the time interval (△T) on the detection signal image;

[0055] c2. Calculate the displacement speed: The displacement speed V is obtained by dividing the physical distance value (△S) between the sensor units corresponding to each other by the time interval (△T) on the corresponding image, that is, V= , multiple △S and △T can be collected to calculate multiple V values ​​and calculate the average value.

[0056] In image matching, Figure 4 Zhongwei Figure 2 or Figure 3 The image comparison relationship between the D1 and D2 sensor units can be obtained by detecting the position where the same mark or defect abnormal image appears, extracting the physical position distance △S between the sensor units D1 and D2, and the time interval △T between the same mark or defect abnormal position on the image; or Figure 6 and Figure 7 Zhongwei Figure 6 When the radially arranged sensor units move in different directions such as X1, X2, X3, etc., the sensor units D01 and D11, or D01 and D26, or D01 and D24 with exactly the same waveform image are taken as matching objects, and the physical position distances △S1, △S2, △S3 of the sensor units D01 and D11, or D01 and D26, or D01 and D24, as well as the time interval △T of the same waveform on the image are extracted respectively.

[0057] And, it also includes a method for determining the moving direction, wherein the sensor units of the array eddy current probe are sequentially numbered to set the sensor unit at the center point of the probe as the origin for calculation and determination, and another reference sensor unit that has the highest image matching similarity with the origin sensor unit and has a positive time interval (△T) difference and the smallest time interval (△T) and physical position distance value (△S) is determined to be the direction of the displacement velocity in the direction in which it moves to the origin sensor in the physical position.

[0058] All sensor units of the array eddy current probe are on the same horizontal plane, and the data detected and analyzed are movement data information in the same plane direction.

[0059] Or in another implementation structure, all sensor units of the array eddy current probe are arranged on different horizontal planes to ensure that the effective detection range is fully covered, thereby improving the stability of the image matching result.

[0060] When all sensor units of the array eddy current probe are set as multi-layer array planar spiral coils, the physical size of the sensor is larger than the size of the sensor detection range, and a multi-layer staggered arrangement is adopted to achieve full coverage of the planar detection range.

[0061] Furthermore, all sensor units of the array eddy current probe are distributed on different horizontal planes, and the detected and analyzed data also include data information of longitudinal displacement.

[0062] When all sensor units of the array eddy current probe are set as multi-layer array planar spiral coils, the sensor unit at the middlemost sensor unit position in the middle layer is used as the origin of calculation and judgment. Another reference sensor unit with the highest image matching similarity with the origin sensor unit, a positive time interval (△T) difference, and the smallest time interval (△T) and physical position distance value (△S) is moved to the direction of the posture vector of the origin sensor unit in physical position, and the displacement direction is determined to be the longitudinal plus transverse synthesis of the displacement velocity.

[0063] The image matching method includes one or both of extracting the identification of the detection object or the defect feature part for comparison and comparing the part of the image over a period of time.

[0064] Image matching is calculated as follows:

[0065] The data collected by the array eddy current sensor are as follows (expressed in matrix):

[0066]

[0067] Each row of the matrix represents a data sample collected by a sensor unit; each column represents a sample at the same time; the data collected by all sensor units are aligned in time.

[0068] ΔT calculation: Calculate the cross-correlation of the signals collected by adjacent sensor units, take the maximum cross-correlation value as the data interval, and convert the data interval into a time interval according to the data sampling rate.

[0069]

[0070]

[0071] Cross-correlation :

[0072]

[0073] When the cross-correlation R reaches the maximum value, it is the position of ΔT. In order to improve the reliability of the calculation results, take as many sensors as possible, calculate ΔT and use statistical methods to obtain stable ΔT calculation results. ΔS is provided by the array arrangement. The speed of the object being measured Finally, the displacement S is obtained by integrating the velocity V over time.

[0074] like Figure 5 , Figures 9 to 14 As shown, the present invention also discloses a sensor device for detecting the moving speed of an array eddy current probe, wherein the sensor device 1 comprises a plurality of sensor units 2 arranged in an array, and is characterized in that the arrangement structure of the plurality of sensor units is set to a structure with a central sensor unit as the origin, and the other sensor units are arranged in a radial order around the origin. In the case of a circular probe, the sensor unit D01 at the center is the origin, and the other sensor units are arranged radially around the origin sensor unit D01. Fig.12 The center point is the radial circular array arrangement. Fig.13 A staggered radial dense circular array arrangement structure is added.

[0075] The sensor device is arranged to be composed of a plurality of planar spiral coil sensor units arranged in an array of three or more layers, wherein a sensor unit in the center of the middle layer is the origin, forming a radial sequential arrangement structure. Fig.11 A single planar sensor device composed of a planar spiral coil array is used to extract and calculate the moving speed. Figure 5 Same as in Fig.12 and Fig.13 They are arranged in a radial array on the same plane. Fig.14 In the structure formed by stacking three single-layer sensor devices 1, as shown in the exploded diagram, the planar spiral coil sensor units in each layer are arranged in a radial array, and the central sensor unit of the middle layer is set as the origin sensor, which is used as a reference point for image matching to calculate the displacement speed and determine the displacement direction. In the figure, the central sensor 121 of the middle layer 12 is used as the determination origin. When the image matching point is the sensor unit 111 in the sensor device layer 11, the longitudinal displacement direction is the Y1 direction, and when the image matching point is the sensor unit 131 in the sensor device layer 13, the longitudinal displacement direction is the Y2 direction; combined with the plane displacement direction, the posture vector displacement direction is synthesized, as shown Fig.15 The speed is calculated by synthesizing the displacement direction of the XYZ vectors in different directions, which is implemented by a computer software program.

[0076] like Fig.16As shown, the present invention also discloses a detection system for the moving speed of an array eddy current probe, which is characterized by comprising a data storage unit 30, a detection signal processing unit 31 and a speed calculation unit 32; wherein: the data storage unit 30 is used to store detection data and all image data for analysis and calculation; the detection signal processing unit 31 includes an eddy current sensor unit numbering module 311 for imaging the detection signal, and a detection signal image processing module 312 for sequentially numbering the sensor units corresponding to the collected signal, and a sensor unit physical position information collection module 313 for collecting the physical position information of the corresponding sensor units; the speed calculation unit 32 includes an image matching module 321 for performing similarity comparison on images detected by each sensor unit, a time difference calculation module 322 for calculating the image time interval, and a displacement speed calculation module 323.

[0077] Among them, it also includes a movement direction determination unit 33, which is used to determine the displacement direction between the eddy current probe and the object to be detected, including a plane translation direction determination module 331 for determining the relative displacement direction on a plane, a longitudinal movement determination module 332 for determining the vertical displacement between the eddy current probe and the object to be detected, and a posture vector calculation and determination module 333 for determining the relative posture between the eddy current probe and the object to be detected.

[0078] The above is one embodiment of the present invention. In addition, it should be noted that any equivalent or simple changes made based on the structure, features and principles described in this patent concept are included in the protection scope of this patent.

Claims

1. A method for detecting the moving speed of an array eddy current probe, which is used to detect and calculate the displacement speed between the array eddy current probe and the detection object, using an eddy current detection probe having multiple identical eddy current sensor units arranged in an array, including detection signal image processing, moving speed calculation, and moving direction determination method. The specific method steps are as follows: Detection signal image processing steps: a1. Sorting and numbering of eddy current sensor units: according to the physical position of each sensor unit on the eddy current probe device, the eddy current sensor units arranged in the array are arranged in a regular numbering order, and the sampling signal of each sensor unit corresponds to the number; b1. Sensor unit physical position distance collection: collect the distance value (△S) between each sensor unit; c1. Signal image processing: The detection signal of each eddy current sensor unit is amplified and image processed, and each processed and calculated image corresponds to the number on step a1; Moving speed calculation steps: a2. Image matching: The numbered image obtained in step c1 is collected over a long period of time, and the images are moved on the time axis for similarity comparison. If the images are the same or the similarity reaches the calibration range, the relevant eddy current sensor unit number and detection signal image are collected; b2. Calculate the time difference: number the eddy current sensor unit collected in step a2, and calculate the time interval (△T) on the detection signal image; c2. Calculate the displacement speed: The displacement speed V value is obtained by dividing the physical position distance value (△S) between the sensor units corresponding to each sensor unit by the time interval (△T) on the corresponding image, that is, Multiple △S and △T can be collected to calculate multiple V values ​​and the average value; Moving direction determination method: The sensor units of the array eddy current probe are sequentially numbered to set the sensor unit at the center point of the probe as the origin of calculation and judgment. Another reference sensor unit that has the highest image matching similarity with the origin sensor unit, and has a positive time interval (△T) difference, and the smallest time interval (△T) and physical position distance value (△S) is moved in the direction of the origin sensor in the physical position, and is determined as the direction of the displacement velocity.

2. The method for detecting the moving speed of an array eddy current probe according to claim 1 is characterized in that All sensor units of the array eddy current probe are on the same horizontal plane, and the data detected and analyzed are movement data information in the same plane direction.

3. The method for detecting the moving speed of an array eddy current probe according to claim 1 is characterized in that All sensor units of the array eddy current probe are arranged on different horizontal planes, and the data detected and analyzed also include data information of longitudinal displacement.

4. The method for detecting the moving speed of an array eddy current probe according to claim 3 is characterized in that When all sensor units of the array eddy current probe are set as multi-layer array planar spiral coils, the sensor unit at the middlemost sensor unit position in the middle layer is used as the origin of calculation and judgment. Another reference sensor unit that has the highest image matching similarity with the origin sensor unit, and has a positive time interval (△T) difference, and the smallest time interval (△T) and physical position distance value (△S) moves to the direction of the posture vector of the origin sensor unit in the physical position, and is determined to be the displacement direction of the longitudinal plus transverse synthesis of the displacement velocity.

5. A method for detecting the moving speed of an array eddy current probe according to claim 1, 2, 3 or 4, characterized in that The image matching method includes one or both of extracting the detection object identification or defect feature part comparison and a period of time image part comparison.

6. A sensor device for detecting the moving speed of an array eddy current probe, using the detection method as claimed in claim 1, comprising a plurality of sensor units arranged in an array, characterized in that The arrangement structure of the plurality of sensor units is set to a structure with a central sensor unit as the origin, and other sensor units are arranged radially and sequentially around the origin.

7. A sensor device for detecting the moving speed of an array eddy current probe according to claim 6, characterized in that The sensor device is arranged to be composed of a plurality of planar spiral coil sensor units arranged in an array of more than three layers, wherein a sensor unit at the center of an intermediate layer is the origin, forming a radially sequentially arranged structure.

8. A system for detecting the moving speed of an array eddy current probe, using the detection method as claimed in claim 1, characterized in that It comprises a data storage unit (30), a detection signal processing unit (31) and a speed calculation unit (32); wherein: The data storage unit (30) is used to store the detection data and all image data for analysis and calculation; The detection signal processing unit (31) comprises an eddy current sensor unit numbering module (311) for imaging the detection signal, a detection signal image processing module (312) for sequentially numbering the sensor units corresponding to the collected signal, and a sensor unit physical position information collection module (313) for collecting physical position information of the corresponding sensor units; The speed calculation unit (32) includes an image matching module (321) for performing similarity comparison on images detected by each sensor unit, a time difference calculation module (322) for calculating the image time interval, and a displacement speed calculation module (323).

9. The detection system of the moving speed of the array eddy current probe according to claim 8, characterized in that It also includes a movement direction determination unit (33) for determining the displacement direction between the eddy current probe and the object to be detected, including a plane translation direction determination module (331) for determining the relative displacement direction on a plane, a longitudinal movement determination module (332) for determining the vertical displacement between the eddy current probe and the object to be detected, and a posture vector calculation determination module (333) for determining the relative posture between the eddy current probe and the object to be detected.

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