Cold cathode x-ray detection system with eddy current detection function and detection method thereof

Abstract

This invention relates to a cold cathode X-ray inspection system and method with eddy current detection function, used for defect detection and evaluation of composite materials with conductive and magnetic panels and pure metal materials of a certain thickness. The inspection system includes a cold cathode X-ray instrument, a DR receiving panel, and a laptop computer. In addition to the cold cathode X-ray detection board, the mainboard of the cold cathode X-ray instrument also has an eddy current detection board. The eddy current detection board and the cold cathode X-ray detection board share the built-in power supply unit and operation unit of the cold cathode X-ray instrument. A transparent flexible panel is added to the photosensitive element layer of the DR receiving panel. A transparent detection coil made of metal coating technology with an array arrangement is set on the transparent flexible panel. During the inspection, the cold cathode X-ray image of the inspected workpiece and the eddy current detection signal on the surface of the inspected workpiece can be acquired simultaneously. By comparing, fusing, and analyzing the two image signals, a complete and accurate inspection result is obtained.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic nondestructive testing technology, and in particular to a cold cathode X-ray testing system and its testing method with eddy current testing function. Background Technology

[0002] For quality control of critical equipment, to ensure safety, it is often necessary to employ 300% or more of non-destructive testing methods to achieve absolute accuracy. In the fusion of information from multiple monitoring parameters, the physical location of the inspected object is an inevitable issue. For example, with the increasing use of composite materials in aircraft, problems that could previously be solved using only eddy current or ultrasonic methods are now insufficient, necessitating new testing methods. In recent years, portable X-ray machines using cold cathode digital imaging have emerged. Compared to conventional hot cathode X-rays, they not only eliminate the need for preheating time but also eliminate the need for film, directly imaging on a DR (radio frequency converter) for digital storage and subsequent analysis. However, for some demanding applications, the detection accuracy of existing cold cathode X-ray inspection systems is still insufficient. For example, they cannot detect minute defects on the surface of the inspected object (such as parallel microcracks). Furthermore, to date, this technology and equipment are relatively independent of ultrasonic and eddy current methods, which is not conducive to data fusion analysis and evaluation of relevant inspection information. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a cold cathode X-ray inspection system with eddy current detection function, aiming to overcome the limitation of existing cold cathode X-ray inspection systems in detecting some minute surface defects. This invention achieves this as follows:

[0004] A cold cathode X-ray inspection system with eddy current detection function is used for defect detection and evaluation of composite materials with conductive and magnetic panels and pure metal materials of a certain thickness. The inspection system includes a cold cathode X-ray instrument, a DR receiving panel, and a laptop computer. In addition to the cold cathode X-ray inspection board, the mainboard of the cold cathode X-ray instrument is also equipped with an eddy current inspection board. The eddy current inspection board and the cold cathode X-ray inspection board share the built-in power supply unit and operation unit of the cold cathode X-ray instrument.

[0005] A transparent flexible panel is added to the photosensitive element layer of the DR receiving panel, and an area array eddy current detection sensing element is provided on the transparent flexible panel; the area array eddy current detection sensing element is a number of transparent detection coils distributed in an area array using metal coating technology.

[0006] During the inspection, the DR receiving panel is attached to the upper or lower surface of the workpiece being inspected, while the cold cathode X-ray instrument is placed opposite the workpiece. The output and reception are controlled by a laptop computer, which simultaneously acquires the cold cathode X-ray image of the workpiece and the eddy current detection signal on the surface of the workpiece. By comparing, fusing, and analyzing the two image signals, a complete and accurate inspection result is obtained.

[0007] As a further improvement, the transparent detection coils distributed in the surface array are provided with 512 coils.

[0008] This invention also discloses a detection method for a cold cathode X-ray detection system with eddy current detection function, which acquires eddy current detection signals and cold cathode X-ray images at corresponding detection points, and performs data fusion analysis of multiple detection methods. The specific detection steps are as follows:

[0009] a. Integrated synchronous detection: The workpiece to be inspected is placed between the cold cathode X-ray instrument and the DR receiving panel. The DR receiving panel is attached to the surface of the workpiece to be inspected. The cold cathode X-ray instrument, the DR receiving panel, and the area array eddy current detection sensing element are controlled by a laptop computer to perform synchronous detection.

[0010] b. Acquisition of detection data samples: The surface array eddy current detection sensing element acquires the eddy current detection signal of the surface or near-surface defects of the workpiece to be inspected, and the DR receiving panel acquires the cold cathode X-ray image of the workpiece to be inspected. The cold cathode X-ray image not only contains the image information of the X-ray transmission of the workpiece to be inspected, but also contains the light grayscale imprint information left by the transparent detection coils distributed in the surface array due to the X-ray transmission.

[0011] c. Data correspondence: Number the array eddy current detection sensing elements and correspond the eddy current detection signal acquired by each array element with the cold cathode X-ray image of the array element's location;

[0012] d. Fusion analysis of detection data: The structure of the workpiece to be inspected is divided into a grid to form a multi-region model, and each region is further divided into blocks according to the layered structure; the various detection information obtained under different detection methods is sorted into blocks and matched, and the various detection information selected in each block is fused and analyzed to form a comprehensive evaluation.

[0013] As a further improvement, in the data fusion analysis of each region, each region is further divided into surface blocks and inner blocks, and a separate comprehensive analysis is performed on the surface blocks. The comprehensive analysis includes removing error signals that can be determined in the comparison of eddy current detection signals and cold cathode X-ray imaging, calculating compensation for missing signals, improving the data samples, and performing a comprehensive assessment of defect location, quantification, and qualitative analysis.

[0014] Compared with existing technologies, this application can achieve the following technical effects:

[0015] I. This invention adds an eddy current detection board to the main detection board of a cold cathode X-ray instrument, enabling the eddy current detection board and the cold cathode X-ray detection board to share the power supply unit and operating unit, and use the same computer resources for allocation. The integrated system is more portable, reduces equipment investment, and can simultaneously perform cold cathode X-ray detection and eddy current detection, as well as data fusion analysis. In this way, the cold cathode X-ray detection system of this invention has the ability to detect minute surface defects.

[0016] II. This invention adds a transparent flexible panel to the photosensitive element layer of the DR receiving panel of the cold cathode X-ray, and sets transparent detection coils in a planar array on the transparent flexible panel using metal coating technology. The transparent flexible panel and the transparent detection coils form an ultra-thin layered structure that does not affect the transmission of cold cathode X-rays. During detection, the cold cathode X-rays pass through the object under test and the transparent detection coils, and the image information of the X-ray transmission of the object under test and the light gray imprint information left by the X-ray transmission of the planar array transparent detection coils can be acquired simultaneously. This enables the positioning of the object under test and solves the problem of physical positioning of the object under test in the information fusion of multiple detection parameters.

[0017] Third, the present invention adopts a planar array eddy current detection sensing element made by adding a transparent flexible panel to the DR receiving panel and printing 512 transparent detection coils on it. The detection time of the planar array is consistent with the detection time of the cold cathode X-ray. In this way, the cold cathode X-ray detection module and the eddy current detection module in the detection system can achieve integrated synchronous operation, thereby realizing the fusion and analysis of multiple detection information. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the present invention or the prior art, or to provide a simple description of the drawings used in the prior art, it is obvious that those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0019] Figure 1 This is a simplified flowchart of the detection method of the present invention.

[0020] Figure 2 This is a schematic diagram of the overall structure of the integrated detection device of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the cold cathode X-ray instrument and DR receiving panel of the present invention.

[0022] Figure 4 for Figure 3 A magnified schematic diagram of region A (area array eddy current detection sensing element).

[0023] Figure 5 This is a schematic diagram of the detection principle.

[0024] In the diagram: 10-Cold cathode X-ray instrument, 20-DR receiver panel, 30-Laptop, 40-Area array eddy current detection sensor element, 41-Transparent flexible panel, 42-Transparent detection coil, 50-Workpiece to be inspected. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0026] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0027] To more comprehensively and systematically inspect and control the quality of some major equipment, this invention studies a cold cathode X-ray inspection system with eddy current detection function, which is used for defect detection and evaluation of composite materials with conductive and magnetic panels and pure metal materials of a certain thickness. The inspection system includes a cold cathode X-ray instrument 10, a DR receiving panel 20, and a laptop computer 30. In addition to the cold cathode X-ray inspection board, the mainboard of the cold cathode X-ray instrument 10 is also equipped with an eddy current inspection board. The eddy current inspection board and the cold cathode X-ray inspection board share the built-in power supply unit and operation unit of the cold cathode X-ray instrument.

[0028] Eddy current testing and cold cathode X-ray testing both belong to the field of electromagnetic applications in principle. The integrated testing system uses a single computer to allocate resources, reducing equipment investment and enabling miniaturization and portability. This system can simultaneously perform cold cathode X-ray testing and eddy current testing, and conduct data fusion analysis, possessing the ability to detect minute surface defects that conventional cold cathode X-ray testing systems lack.

[0029] A transparent flexible panel 41 is added to the photosensitive element layer of the DR receiving panel 20, and an array eddy current detection sensing element 40 is provided on the transparent flexible panel 41. The array eddy current detection sensing element 40 is a number of transparent detection coils 42 distributed in an array using metal coating technology. The array eddy current detection sensing element 40 can perform eddy current detection of conductive and magnetic materials such as metal or carbon fiber on the surface of composite materials. Furthermore, the transparent flexible panel 41 and the ultra-thin transparent detection coils made using metal coating technology do not affect the penetration of cold cathode X-rays. During detection, the transparent detection coils arranged in an array leave a shallow imprint on the DR receiving panel 20 corresponding to the regularity of the array arrangement.

[0030] During testing, the DR receiving panel 20 is placed against the upper or lower surface of the workpiece to be inspected, while the cold cathode X-ray instrument 10 is placed opposite the workpiece 50. The output and reception are controlled by the laptop 30, and the cold cathode X-ray image of the workpiece and the eddy current detection signal on the surface of the workpiece are acquired simultaneously. By comparing, fusing, and analyzing the two image signals, a complete and accurate test result is obtained.

[0031] As a further improvement, the transparent detection coils 42 distributed in the surface array are provided with 512 elements. The detection working time of conventional cold cathode X-ray equipment is less than 1 second. The eddy current detection structure with 512 elements used in this invention also completes one surface array detection in less than 1 second. During use, computer resources are uniformly allocated for detection, improving the consistency between eddy current detection and cold cathode X-ray detection.

[0032] This invention also discloses a detection method for a cold cathode X-ray detection system with eddy current detection function, which acquires eddy current detection signals and cold cathode X-ray images at corresponding detection points, and performs data fusion analysis of multiple detection methods. The specific detection steps are as follows:

[0033] a. Integrated synchronous detection: The workpiece to be inspected is placed between the cold cathode X-ray instrument and the DR receiving panel. The DR receiving panel is attached to the surface of the workpiece to be inspected. The cold cathode X-ray instrument, the DR receiving panel, and the area array eddy current detection sensing element are controlled by a laptop computer to perform synchronous detection.

[0034] b. Acquisition of detection data samples: The surface array eddy current detection sensing element acquires the eddy current detection signal of the surface or near-surface defects of the workpiece to be inspected, and the DR receiving panel acquires the cold cathode X-ray image of the workpiece to be inspected. The cold cathode X-ray image not only contains the image information of the X-ray transmission of the workpiece to be inspected, but also contains the light gray imprint information (with regularity) left by the transparent detection coils distributed in the surface array due to the X-ray transmission. This light gray imprint information can be used to locate the inspected object, thereby realizing defect location.

[0035] c. Data correspondence: Number the array eddy current detection sensing elements and correspond the eddy current detection signal acquired by each array element with the cold cathode X-ray image of the array element's location;

[0036] d. Fusion analysis of detection data: The structure of the workpiece to be inspected is divided into a grid to form a multi-region model, and each region is further divided into blocks according to the layered structure; the various detection information obtained under different detection methods is sorted into blocks and matched, and the various detection information selected in each block is fused and analyzed to form a comprehensive evaluation.

[0037] The mesh-based decomposition of the workpiece structure to be inspected involves using computer software to create a simulated structural model, decomposing the structure, and performing data fusion analysis on each region. Each region is further divided into surface blocks and inner blocks, and the surface blocks are analyzed separately. The comprehensive analysis includes removing error signals that can be determined from the comparison of eddy current detection signals and cold cathode X-ray imaging, calculating compensation for missing signals, improving the data samples, and performing a comprehensive assessment of defect location, quantification, and qualitative analysis.

[0038] When there are minute defects on the surface of the workpiece to be inspected, the cold cathode X-ray imaging obtained by the cold cathode X-ray detection module cannot detect this type of defect signal. At the same time, the eddy current detection signal obtained by the area array eddy current detection module can detect minute surface defect signals with high sensitivity. After data fusion analysis, a more complete and accurate detection result can be obtained.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A cold cathode X-ray detection system with eddy current detection function, used for defect detection and evaluation of composite materials with conductive and magnetizable panels and pure metal materials of certain thickness, the detection system comprising a cold cathode X-ray instrument, a DR receiving panel and a notebook computer, characterized in that the detection mainboard of the cold cathode X-ray instrument is additionally provided with an eddy current detection panel in addition to the cold cathode X-ray detection panel, and the eddy current detection panel and the cold cathode X-ray detection panel share the power supply unit and the operation unit built in the cold cathode X-ray instrument; a layer of transparent flexible panel is additionally provided on the photosensitive element layer of the DR receiving panel, and the transparent flexible panel is provided with a surface array eddy current detection sensing element; the surface array eddy current detection sensing element is a plurality of surface array distributed transparent detection coils made by metal plating film technology; during detection, the DR receiving panel is placed on the upper or lower surface of the detected workpiece in a manner of lamination, and the cold cathode X-ray instrument is placed on the other side of the detected workpiece in a relative manner, and the notebook computer is used for control output and reception, and the cold cathode X-ray imaging graph of the detected workpiece and the eddy current detection signal of the surface of the detected workpiece are obtained at the same time, and complete and accurate detection results are obtained by information comparison, data fusion and analysis and evaluation of the two kinds of image signals. The surface array distributed transparent detection coils are provided with 512. The specific detection steps are as follows: a. Integrated synchronous detection: the workpiece to be detected is placed between the cold cathode X-ray instrument and the DR receiving panel, the DR receiving panel is arranged on the surface of the workpiece to be detected in a manner of lamination, and the cold cathode X-ray instrument, the DR receiving panel and the surface array eddy current detection sensing element are synchronously detected by the notebook computer; 2. The cold cathode X-ray detection system with eddy current detection function according to claim 1, characterized in that, b. Acquisition of detection data samples: the surface array eddy current detection sensing element acquires the eddy current detection signal of the surface or near-surface defects of the workpiece to be detected, the DR receiving panel acquires the cold cathode X-ray imaging graph of the workpiece to be detected, and the cold cathode X-ray imaging graph not only contains the image information of the X-ray transmission of the workpiece to be detected, but also contains the light gray shadow printing information left by the surface array distributed transparent detection coils due to X-ray transmission; 3. The detection method of the cold cathode X-ray detection system with eddy current detection function, using the detection system of any one of claims 1 to 2, obtaining the eddy current detection signal and the cold cathode X-ray imaging image corresponding to the detection point, and performing data fusion analysis of multiple detection methods, characterized in that, c. Data correspondence: the surface array eddy current detection sensing element is numbered, and the eddy current detection signal acquired by each array element and the cold cathode X-ray imaging graph at the position of the array element are corresponded; d. Fusion analysis of detection data: the structure of the workpiece to be detected is divided into a multi-region model in a grid format, and each region is further divided into blocks according to the layered structure; the various detection information acquired under different detection modes is sorted and corresponded by blocks, and the various detection information sorted in each block is fused and analyzed to form a comprehensive evaluation. In the step d, in the data fusion analysis of each region, each region is further divided into a surface layer block and an inner layer block, and a separate comprehensive analysis is performed on the surface layer block, and the comprehensive analysis includes eliminating the error signal that can be determined in the comparison of the eddy current detection signal and the cold cathode X-ray imaging graph, calculating the compensation missing signal, perfecting the data samples and comprehensively evaluating the defects in positioning, quantification and qualitative. ​ ​ 4. The detection method of the cold cathode X-ray detection system with eddy current detection function according to claim 3, characterized in that, ​

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