Calibration part, calibration system and calibration method

Abstract

The invention provides a calibration piece, the calibration piece and a to-be-calibrated scanning object of radiation imaging equipment have a basically consistent shape, and the size of the calibration piece and the size of the scanning object have a predetermined proportional relation. The invention further provides a calibration system and a calibration method.

Description

Technical Field

[0001] The present disclosure relates to the field of radiation scanning, the field of radiation imaging equipment calibration, the field of battery cell or battery module detection or other fields, and more specifically, to a calibration component, a calibration system and a calibration method. Background Art

[0002] Calibration is the process of correcting equipment to improve its accuracy, which can include geometric calibration, mechanical calibration, image calibration, etc. Among them, geometric calibration is used to calibrate geometric parameters, mechanical calibration is used to correct the parameters of mechanical equipment during operation, and image calibration is used to eliminate systematic errors in the image reconstruction process.

[0003] In the related art, for example, a cylindrical calibration piece is used, whose outer surface is inlaid with spheres of different materials from the base, and evenly distributed on the cylindrical surface. The cylindrical calibration piece is used for the calibration of radiation scanning systems, such as geometric calibration, mechanical calibration, and image calibration of radiation imaging equipment and transportation equipment.

[0004] In the process of implementing the inventive concept of the present disclosure, the inventors discovered that existing calibration parts cannot meet the requirements of high-precision radiation scanning imaging, cannot be used for high-precision system calibration, and have large differences in calibration effects for different scanning objects, which affects the calculation of calibration values ​​and scanning values ​​in actual radiation imaging scenarios. Summary of the invention

[0005] In view of the above problems, the present disclosure provides a calibration component, a calibration system and a calibration method.

[0006] According to a first aspect of the present disclosure, a calibration piece is provided. The calibration piece has a shape substantially consistent with a scanning object of a radiation imaging device to be calibrated, and a size of the calibration piece has a predetermined proportional relationship with a size of the scanning object.

[0007] In some embodiments, the calibration piece includes: a first surface; a second surface opposite to the first surface; and a calibration portion located between the first surface and the second surface; wherein at least part of the radiation emitted by the radiation source of the radiation imaging device passes through the first surface, the calibration portion, and the second surface in sequence and is received by the detector of the radiation imaging device.

[0008] In some embodiments, the calibration portion includes a plurality of grooves, wherein at least two of the grooves have different depths.

[0009] In some embodiments, a plurality of grooves are stacked along the path of the ray.

[0010] In some embodiments, the number of the calibration parts is substantially consistent with the number of the parts to be detected located on the scan object; and / or, the number of the calibration parts is in a predetermined multiple relationship with the number of the parts to be detected located on the scan object.

[0011] In some embodiments, the multiple calibration parts correspond one-to-one to the multiple parts to be detected located on the scanned object, wherein the spatial distribution of each calibration part on the calibration piece is substantially consistent with the spatial distribution of the corresponding part to be detected on the scanned object.

[0012] In some embodiments, each calibration portion and the corresponding portion to be detected have substantially the same shape, and / or, the size of each calibration portion and the size of the corresponding portion to be detected have a predetermined proportional relationship.

[0013] In some embodiments, any two calibration parts are separated by a first distance, and the first distance has a predetermined proportional relationship with a second distance between two to-be-detected parts corresponding to the two calibration parts.

[0014] In some embodiments, the portion to be detected of the scanned object is located in a first corner region, and the calibration portion of the calibration piece is located in a second corner region corresponding one-to-one to the first corner region.

[0015] In some embodiments, the scanned object includes a battery cell or a battery module.

[0016] Another aspect of the embodiments of the present disclosure provides a calibration system, which includes: a radiation imaging device; a calibration part as in any of the above embodiments; and a control unit, which is communicatively connected to the radiation imaging device and is used to obtain calibration data based on a radiation image obtained by scanning the calibration part by the radiation imaging device.

[0017] In some embodiments, the calibration system further includes: a first motion mechanism; a second motion mechanism, which is arranged at an interval from the first motion mechanism, and the first motion mechanism is used to transport the calibration part to the second motion mechanism via the interval area; wherein, when the calibration part on the calibration part is located in the interval area, the radiation imaging device is configured to scan the calibration part.

[0018] In some embodiments, the calibration data is used to calibrate at least one of the following: a transport speed of the first motion mechanism, a transport speed of the second motion mechanism, and consistency of transport speeds of the first motion mechanism and the second motion mechanism.

[0019] In some embodiments, the radiation imaging device includes: a radiation source; a detector; an annular rotating disk for mounting the radiation source and the detector, wherein the annular rotating disk includes a scanning area and is configured to rotate circumferentially around a spacing area; wherein the first motion mechanism is used to move axially along the annular rotating disk to transport the calibration part to the second motion mechanism through the spacing area.

[0020] In some embodiments, the first motion mechanism and the second motion mechanism transport in a step-by-step manner; the calibration data is used to calibrate at least one of the following: the rotation speed of the annular rotating disk, the consistency between the rotation speed of the annular rotating disk and the step-by-step interval time of the first motion mechanism, and the consistency between the rotation speed of the annular rotating disk and the step-by-step interval time of the second motion mechanism.

[0021] Another aspect of an embodiment of the present disclosure provides a calibration method, which includes: selecting a calibration part based on a scanning object of the radiation imaging device to be calibrated, wherein the selected calibration part has a shape that is basically the same as the scanning object of the radiation imaging device to be calibrated, and a size of the calibration part has a predetermined proportional relationship with a size of the scanning object; and obtaining calibration data using a calibration system as in any of the above embodiments.

[0022] One or more of the above-mentioned embodiments have the following beneficial effects: the calibration part and the scanned object have a specific relationship in shape and size. During calibration, the actual conditions for performing radiation imaging on the scanned object can be more accurately simulated, and calibration data that meets the requirements can be obtained more quickly, reducing the amount of data calculation and calculation errors, and effectively shortening the calibration time. It helps to improve the calibration accuracy of at least one of geometric calibration, mechanical calibration, and image calibration, so that the radiation imaging equipment can achieve high-precision radiation scanning imaging, thereby improving the quality of radiation imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above contents and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0024] Figure 1 The structure diagram of the calibration system according to the embodiment of the present disclosure is schematically shown.

[0025] Figure 2 The structure diagram of the calibration component according to the first embodiment of the present disclosure is schematically shown.

[0026] Figure 3 Schematically shows Figure 2 Three views and partial enlarged views of the winning parts.

[0027] Figure 4 Schematically illustrates an embodiment of the present disclosure Figure 3 A'-A' cross-section view, enlarged view of area A and enlarged view of area B of the calibrated part.

[0028] Figure 5 Schematically illustrates an embodiment of the present disclosure Figure 3 B'-B' cross-section view, enlarged view of area C and enlarged view of area D of the calibrated part.

[0029] Figure 6Schematically illustrates an embodiment of the present disclosure Figure 3 C'-C' cross-section view, F area magnification view and G area magnification view of the calibrated part.

[0030] Figure 7 Schematically illustrates an embodiment of the present disclosure Figure 3 D'-D' cross-section view, H area magnification view and I area magnification view of the calibrated part.

[0031] Figure 8 The top view and the front view of the calibration component according to the second embodiment of the present disclosure are schematically shown.

[0032] Fig. 9 Schematically shows Figure 8 Top and front views of one of the calibration blocks in the calibration component.

[0033] Fig.10 Three views of a calibration component according to the third embodiment of the present disclosure are schematically shown.

[0034] Fig.11 Schematically shows Fig.10 Top and front views of one of the calibration blocks in the calibration component.

[0035] Fig.12 The flowchart of the calibration method according to the first embodiment of the present disclosure is schematically shown.

[0036] Fig.13 A flowchart of a calibration method according to the second embodiment of the present disclosure is schematically shown.

[0037] Fig.14 The flowchart of the calibration method according to the third embodiment of the present disclosure is schematically shown.

[0038] The reference numerals related to the above drawings are as follows:

[0039] 100. Calibration system; 110. Radiation imaging device; 111. Radiation source; 112. Detector; 113. Annular rotating disk; 114. Support mechanism; 130. Control unit; 140. First motion mechanism; 150. Second motion mechanism.

[0040] Calibration Part Example 1

[0041] 120. Calibration piece; 121. First surface; 122. Second surface; 123. Calibration portion; 1231. Groove.

[0042] Calibration Part Example 2

[0043] 220, calibration piece; 221, first surface; 222, second surface; 223, calibration part; 224, substrate; 2241, second connecting part; 225, calibration block; 2251, first connecting part.

[0044] Calibration Part Example 3

[0045] 320, calibration piece; 321, first surface; 322, second surface; 323, calibration part; 324, base; 3241, second connecting part; 325, calibration block; 3251, first connecting part; 326, first telescopic mechanism; 327, second telescopic mechanism; 328, connecting block.

[0046] It should be noted that, for the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the sizes of the overall / local structures or the overall / local areas may be enlarged or reduced, that is, these drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0047] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0048] Figure 1 The structure diagram of the calibration system according to the embodiment of the present disclosure is schematically shown. It should be noted that: Figure 1 The examples shown are merely examples to which the embodiments of the present disclosure may be applied, so as to help those skilled in the art understand the technical content of the present disclosure, but it does not mean that the embodiments of the present disclosure may not include other devices, shapes or structures.

[0049] like Figure 1 As shown, the calibration system 100 of this embodiment may include a radiation imaging device 110, a calibration piece, and a control unit 130. The control unit 130 is in communication with the radiation imaging device 110 and is used to obtain calibration data based on the radiation image obtained by the radiation imaging device 110 scanning the calibration piece.

[0050] For example, the radiation imaging device 110 may include a computed tomography (CT) imaging device, which uses the radiation source 111 to emit radiation to perform a tomographic scan on the scanned object, and then the analog signal received by the detector 112 is converted into a digital signal, and the attenuation coefficient of each pixel is calculated by an electronic computer, and then the image is reconstructed, so that the tomographic structure of each part of the scanned object can be displayed. It can be understood that the radiation imaging device 110 can also include other devices that can realize the radiation imaging function.

[0051] The control unit 130 may be connected to the radiation imaging device 110 through a network, and the network may include various connection types, such as wired, wireless communication links or optical fiber cables, etc. The control unit 130 may include a tablet computer, a laptop computer, a desktop computer, etc. The control unit 130 may also include a server that provides various services, such as an independent physical server, a server cluster or a distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud computing, network services, and middleware services.

[0052] The radiation imaging device 110 can scan a part or the entire area of ​​the calibration object to obtain a radiation image, such as a CT image.

[0053] For example, during the calibration process, the calibration piece is located in the scanning area formed by the X-ray, and a radiation image of the calibration piece is obtained; the actual operating parameters of each device during the calibration process and the image information of the radiation image are collected, and the calibration data is generated in combination with the physical parameters of the calibration piece. The calibration data is used to perform at least one of geometric calibration, mechanical calibration and image calibration on the radiation imaging device 110 and other devices in the calibration system 100, thereby at least partially alleviating or solving the problem of inaccurate radiation scanning area or poor radiation image quality caused by differences between devices and / or device aging.

[0054] In some embodiments, the calibration piece has a substantially identical shape to the scanned object of the radiation imaging device 110 to be calibrated, and the size of the calibration piece has a predetermined proportional relationship to the size of the scanned object. It is understood that the calibration piece includes a component or device used to calibrate the performance of the device, and generally includes specific geometric features or material properties. The calibration piece of this embodiment is not limited to being used for Figure 1 The calibration system 100 shown can also be used in other radiation scanning scenarios that require calibration.

[0055] Exemplarily, the scanned object may include luggage, a package, a human body, a workpiece, etc. For example, the scanned object includes a battery cell or a battery module. The calibration piece may have a substantially identical shape to the battery cell or the battery module, and the size of the calibration piece may have a predetermined proportional relationship to the size of the battery cell or the battery module.

[0056] Basically the same shape means that the similarity between the shape of the calibration piece and the scanned object is higher than a certain threshold, such as 90% (for example only). For example, by extracting key feature points (such as corner points, edge points, etc.) of the calibration piece contour and the scanned object contour, and comparing the position and distribution of these feature points, if the feature points match, the shape is basically the same. Alternatively, by detecting the edge of the calibration piece and the scanned object and comparing the edge contours, if the edge contours match within a certain error range, the shape is basically the same. It should be understood that other methods can also be used to determine whether the shape of the calibration piece and the scanned object is basically the same, which is not limited here.

[0057] It should be noted that the fact that the calibration part and the scanned object have basically the same shape does not mean that the sizes must be exactly the same. For example, if the contour shapes of the calibration part and the scanned object are both rectangular, even if the sizes are different, they can be considered to have basically the same shape because they are both rectangular.

[0058] When the shapes of the calibration piece and the scanned object are basically the same, the calibration piece can be equalized, enlarged or reduced in length, width, height and other parameters according to a predetermined ratio relationship and based on the size of the scanned object. Equality means that the size of the calibration piece is the same as the size of the scanned object, and the predetermined ratio relationship is 1:1. Enlargement means that the size of the calibration piece is larger than the size of the scanned object, for example, the predetermined ratio relationship is 2:1. Reduction means that the size of the calibration piece is smaller than the size of the scanned object, for example, the predetermined ratio relationship is 1:2.

[0059] According to the embodiments of the present disclosure, the calibration part and the scanned object have a specific relationship in shape and size. During calibration, the actual conditions for performing radiation imaging on the scanned object can be more accurately simulated, and calibration data that meets the requirements can be obtained more quickly, thereby reducing the amount of data calculation and calculation errors, effectively shortening the calibration time, and helping to improve the calibration accuracy of at least one of geometric calibration, mechanical calibration, and image calibration, so that the radiation imaging device 110 can achieve high-precision radiation scanning imaging, thereby improving the quality of radiation imaging.

[0060] Calibration Part Example 1

[0061] Figure 2 The structure of the calibration component 120 according to the first embodiment of the present disclosure is schematically shown. Figure 3 Schematically shows Figure 2 Three views and partial enlarged views of the calibrated component 120. Figure 3 (a) shows a top view of the calibration piece 120, Figure 3 (b) shows a front view of the calibration element 120, Figure 3 (c) shows a side view of the calibration piece 120, Figure 3 (d) shows Figure 3(c) Enlarged view of area E.

[0062] Figure 4 Schematically illustrates an embodiment of the present disclosure Figure 3 A′-A′ cross-sectional view, enlarged view of area A and enlarged view of area B of the calibration component 120 . Figure 5 Schematically illustrates an embodiment of the present disclosure Figure 3 B'-B' cross-sectional view, C area enlarged view and D area enlarged view of the marking component 120. Figure 6 Schematically illustrates an embodiment of the present disclosure Figure 3 The C′-C′ cross-sectional view, the enlarged view of the F area, and the enlarged view of the G area of ​​the calibration component 120 . Figure 7 Schematically illustrates an embodiment of the present disclosure Figure 3 D'-D' cross-sectional view, H area enlarged view and I area enlarged view of the calibration component 120.

[0063] In some embodiments, the calibration member 120 includes a first surface 121 and a second surface 122, wherein the second surface 122 is opposite to the first surface 121. The calibration portion 123 is located between the first surface 121 and the second surface 122; wherein at least part of the radiation emitted by the radiation source 111 passes through the first surface 121, the calibration portion 123, and the second surface 122 in sequence and is received by the detector 112.

[0064] Reference Figure 1 , Figure 2 and Figure 3 , the first surface 121 may be the surface of the calibration member 120 facing the radiation source 111, the second surface 122 may be the surface of the calibration member 120 facing the detector 112, and the calibration portion 123 may be located in the interlayer between the first surface 121 and the second surface 122. The calibration member 120 may be provided with one or more calibration portions 123. The area of ​​each calibration portion 123 may be the same as that of the first surface 121 or the second surface 122, that is, the orthographic projection of each calibration portion 123 may overlap with the orthographic projection of the first surface 121 or the second surface 122 and the projection area is substantially equal. Alternatively, the area of ​​each calibration portion 123 may be smaller than the area of ​​the first surface 121 or the second surface 122. Each calibration portion 123 is provided in a local area of ​​the calibration member 120, and its orthographic projection may overlap with the orthographic projection of the first surface 121 or the second surface 122 and the projection area is smaller.

[0065] Exemplarily, the calibration unit 123 is used to provide calibration reference information in the radiation image as a reference for the calibration work. During the calibration process, the rays pass through the first surface 121, the calibration unit 123, and the second surface 122 in sequence and are received by the detector 112. The calibration unit 123 can be scanned and imaged by the radiation imaging device 110, and recognized by the control unit 130 to obtain calibration data. By extracting the calibration reference information through one or more calibration units 123, accurate calibration data can be obtained to calibrate the radiation imaging device 110.

[0066] For example, the calibration part 123 may have a different material from the base of the calibration part 120, and the base includes a first surface 121 and a second surface 122. For example, the ray source 111 emits X-rays, and since the calibration part 123 is made of a different material from the base, their responses to the X-rays will also be different, thereby having different representations in the radiation image, which helps to obtain accurate calibration data. For example, the base is made of aluminum, and the calibration part 123 is made of steel, copper or non-metallic materials (for example only).

[0067] For another example, the calibration unit 123 can simulate the structure of the interlayer in the scanned object, such as simulating at least one of the position, shape, size, material, etc., so that the actual radiation scanning scene can be simulated during the calibration process. The structure of the calibration unit 123 can include grooves, holes, protrusions, or structures with regular shapes.

[0068] According to an embodiment of the present disclosure, a calibration portion 123 is set between the first surface 121 and the second surface 122. Combined with the characteristics of X-ray tomography or transmission scanning, it can help to scan the calibration portion 123 during the calibration process, simulate the actual radiation imaging scene, improve the quality of radiation imaging, and achieve a better calibration effect.

[0069] In some embodiments, the portion to be detected of the scanned object is located in a first corner region, and the calibration portion 123 of the calibration member 120 is located in a second corner region corresponding one-to-one to the first corner region.

[0070] For example, when the scan object is a battery cell, the portion to be measured is located at one or more corners (i.e., the first corner region) of the battery cell, and the calibration portion 123 is set in the second corner region of the calibration member 120 in a one-to-one correspondence. Figure 2 and Figure 3 The calibration member 120 is hollowed out in the middle to reduce the overall weight, and calibration portions 123 - 1 , 123 - 2 , 123 - 3 and 123 - 4 are respectively provided at the four second corner regions.

[0071] The part to be tested of the battery cell may include the battery cell pole pieces and impurities in the battery cell. The calibration unit 123 can simulate the structure of the part to be tested, for example, simulating at least one item of the position, shape, size, material, etc. of the battery cell pole pieces at the part to be tested, thereby simulating the actual radiation scanning scene during the calibration process.

[0072] According to the embodiments of the present disclosure, the part to be detected of the simulated scanning object can provide deterministic information in the calibration data, thereby reducing the amount of calculation and calculation errors.

[0073] In some embodiments, the marking portion 123 includes one or more grooves 1231 . In the case where the marking portion 123 includes a plurality of grooves 1231 , at least two grooves 1231 have different depths.

[0074] like Figures 3 to 7 As shown, each of the A region, B region, C region, D region, F region, G region, H region, and I region displays a plurality of grooves 1231 with different depths. For example, the A region includes three grooves with a width of 2 mm and different depths, such as 0.9 mm, 1.1 mm, and 1.3 mm (for example only), wherein the width along the current Figure 4 The depth is calculated along the left and right directions shown. Figure 4 The parameters of the groove 1231 in the F region are consistent with those of the groove 1231 in the A region. The two regions respectively show two side views of the calibration portion 123-1, where the width is along the current Figure 6 The depth is calculated along the current Figure 6 Calculations are performed in the left and right directions as shown.

[0075] For example, the depth of the groove 1231 in the same region is calculated along the inner extension direction toward the calibration member 120, and the width is calculated along the direction perpendicular to the depth. Any two grooves 1231 in different grooves in the same region may have the same or different widths, and may also have the same or different depths. Any two grooves 1231 in different regions may have the same or different widths, and may also have the same or different depths.

[0076] For example, any two grooves 1231 in different grooves in the same region may have the same or different shapes. Any two grooves 1231 in different regions may have the same or different shapes. Figure 4~Figure 7 The cross section of each groove 1231 is an open rectangle, but this is for the convenience of explanation and understanding, and the present disclosure is not limited thereto. For example, the cross section of the groove 1231 can be a triangle, a trapezoid, etc., and the cross-sectional profile of the groove 1231 can also include curved lines. This helps to provide significant feature information that is different from other parts of the calibration piece 120, so that accurate calibration can be performed based on the calibration data.

[0077] According to an embodiment of the present disclosure, by radiographically imaging a plurality of grooves 1231, parameters of each groove 1231, such as depth, width, and shape, etc., can be extracted through the radiographic image. For example, by identifying the depth of each groove 1231 and the depth difference between different grooves 1231, the depths can be compared with actual measured values ​​for calibration, thereby improving the scanning accuracy in actual radiation scanning scenarios.

[0078] In some embodiments, the plurality of grooves 1231 are stacked along the path of the ray, that is, the ray passes through the plurality of grooves 1231 in sequence.

[0079] For example, in a CT scan scenario, a radiation image is obtained through a reconstruction algorithm, and calibration data can be obtained by identifying the differences between the grooves 1231 of different layers and combining them with actual measurement values. Figure 6 The middle F region shows three layers of grooves 1231 stacked up and down. Combined with the stacking effect of multiple grooves 1231 in the radiation image, calibration data is obtained through the depth of each layer of grooves 1231, the depth difference between grooves 1231 in different layers, and actual measurement values.

[0080] For example, when the scanning object is a battery cell, at least a plurality of electrodes in the first corner region of the battery cell are stacked. Therefore, for each first corner region, the stacked electrodes can be simulated in the second corner region corresponding to the calibration piece 120, and the stacked grooves 1231 can be set to simulate the stacked parameters between the electrode pieces of the battery cell at the part to be detected, such as the number of layers, the gap between adjacent layers, and the electrode pieces of each layer, so that the actual radiation scanning scene can be simulated during the calibration process.

[0081] According to the embodiments of the present disclosure, the characteristics of ray radiation imaging can be utilized to obtain accurate calibration data through the information represented in the radiation image by the stacked grooves 1231. In addition, the stacked structure in the part to be detected of the scanned object can be simulated, such as the stacked poles in the battery cell, which can provide deterministic information in the calibration data and reduce the amount of calculation and calculation errors.

[0082] In some embodiments, the number of the calibration parts 123 is substantially consistent with the number of the parts to be detected located on the scan object; and / or, the number of the calibration parts 123 is in a predetermined multiple relationship with the number of the parts to be detected located on the scan object.

[0083] The number is substantially the same includes that the difference between the number of the calibration parts 123 and the number of the parts to be detected on the scanned object is less than a target value, for example, 1. The predetermined multiple relationship is, for example, that the number of the calibration parts 123 is 0.5 times, 1 times, or 2 times the number of the parts to be detected on the scanned object, which is only an example.

[0084] According to the embodiments of the present disclosure, by simulating the number of parts to be detected of the scanned object in the actual scanning scene, accurate reference data can be provided in the quantity dimension, which is beneficial to calibration. For example, when the number of calibration parts 123 and the number of parts to be detected are substantially consistent or have a predetermined multiple relationship, the radiation image in the calibration process can be more consistent in quantity with the radiation image in the actual scanning scene, thereby achieving a better calibration effect.

[0085] In some embodiments, the multiple calibration parts 123 correspond one-to-one to the multiple parts to be detected located on the scanned object, wherein the spatial distribution of each calibration part 123 on the calibration member 120 is substantially consistent with the spatial distribution of the corresponding part to be detected on the scanned object.

[0086] Spatial distribution refers to the layout, position and arrangement of the calibration part 123 in the calibration part 120, or the layout, position and arrangement of the part to be detected in the scanned object. For example, multiple parts to be detected in the battery cell are distributed in diagonal or four corner areas, such as Figure 2~Figure 7 As shown, the plurality of calibration portions 123 may be located at diagonal corners or four corner regions of the calibration member 120 .

[0087] According to the embodiments of the present disclosure, by simulating the spatial distribution of the to-be-detected portion of the scanned object in the actual scanning scene, accurate reference data can be provided in the spatial dimension, which is beneficial for calibration.

[0088] In some embodiments, each calibration portion 123 has a substantially identical shape to the corresponding portion to be detected, and / or a size of each calibration portion 123 has a predetermined proportional relationship to a size of the corresponding portion to be detected.

[0089] The relationship between the size of each calibrated portion 123 and the size of the corresponding portion to be detected is determined by the relationship between the size of the calibrated object 120 and the size of the scanned object.

[0090] For example, when the scanned object is a battery cell, the calibration unit 123 includes a plurality of calibration sheets, which correspond to the plurality of pole pieces of the battery cell one by one, that is, each calibration sheet has a substantially identical shape to the corresponding pole piece, and / or the size of each calibration sheet has a predetermined proportional relationship to the size of the corresponding pole piece. The material of the calibration sheet can be consistent with the material of the pole piece, or can be copper, aluminum, or the like, and the material of the calibration sheet can be different from the base material of the calibration member 120.

[0091] According to the embodiments of the present disclosure, by maintaining at least one of the shape relationship and the size relationship between the calibration portion 123 and the portion to be detected, not only the calibration effect can be enhanced, but also a more accurate calibration can be performed.

[0092] In some embodiments, any two calibration parts 123 are separated by a first distance, and the first distance has a predetermined proportional relationship with a second distance between two to-be-detected parts corresponding to the two calibration parts 123 .

[0093] For example, when the scanning object is a battery cell, each diagonal corner of the battery cell has a portion to be detected, and each diagonal corner of the calibration piece 120 has a corresponding calibration portion 123, wherein the first distance between the two calibration portions 123 and the second distance between the two portions to be detected have a predetermined proportional relationship.

[0094] According to an embodiment of the present disclosure, based on the first distance between any two calibration parts 123, the distance relationship between the corresponding parts to be detected in the actual scanning scene can be simulated, thereby achieving high-precision calibration based on the spatial distribution, shape, size of each calibration part 123 and the distance relationship between the calibration parts 123.

[0095] Calibration Part Example 2

[0096] Figure 8 The top view and the front view of the calibration component 220 according to the second embodiment of the present disclosure are schematically shown. Figure 8 (a) shows a top view of the calibration piece 220, Figure 8 (b) shows a front view of the calibration component 220 .

[0097] In some embodiments, the calibration piece 220 includes a base 224 and at least one calibration block 225, wherein each calibration block 225 is detachably connected to the base 224; the shape and / or size of at least one of the base 224 and the calibration block 225 is predetermined according to the scanning object of the radiation imaging device 110 to be calibrated, so that the calibration piece 220 has a substantially consistent shape with the scanning object, and the size of the calibration piece 220 has a predetermined proportional relationship with the size of the scanning object.

[0098] For example, multiple specifications of the substrate 224 and the calibration block 225 can be provided, and the multiple specifications include different shapes and sizes. Based on the size and shape of the scanned object, a suitable substrate 224 and calibration block 225 can be selected for combination, and one or more substrates 224 and one or more calibration blocks 225 can be detachably connected to form the calibration part 220. Figure 8 Schematic diagram of the calibration block 225 - 1 , the calibration block 225 - 2 , the calibration block 225 - 3 , and the calibration block 225 - 4 are shown.

[0099] The base 224 is the main body of the calibration member 220, which may include a plate, a frame or other structures. The calibration block 225 is used to provide characteristic information for obtaining calibration data, which can be represented in the radiation image. The detachable connection includes threaded connection, mortise and tenon connection, pin connection or snap connection.

[0100] For example, the base 224 may be made of metal materials (such as copper, steel, etc.) to ensure its stability and durability. The design of the base 224 may include multiple mounting slots or interfaces to accommodate calibration blocks 225 of different shapes and sizes. The calibration block 225 may be made of a material similar to the scanned object to improve its similarity during the imaging process.

[0101] According to the embodiments of the present disclosure, the calibration component 220 has a specific relationship with the scanned object in shape and size. During calibration, the actual conditions for performing radiation imaging on the scanned object can be more accurately simulated, and calibration data that meets the requirements can be obtained more quickly, thereby reducing the amount of data calculation and calculation errors, effectively shortening the calibration time, and helping to improve the calibration accuracy of at least one of geometric calibration, mechanical calibration, and image calibration, so that the radiation imaging device 110 can achieve high-precision radiation scanning imaging, thereby improving the quality of radiation imaging.

[0102] In addition, the base 224 and at least one calibration block 225 are detachably connected to form the calibration part 220, which reduces the processing cost, and the calibration part obtained can meet the calibration requirements of scanning objects of different specifications by replacing the base 224 or the calibration block 225. It is also possible to replace damaged parts in a targeted manner instead of scrapping the calibration part 220 as a whole, which can save costs.

[0103] In some embodiments, reference Figure 8 The calibration block 225 includes a calibration portion 223, a first surface 221, and a second surface 222. The second surface 222 is opposite to the first surface 221; the calibration portion 223 is located between the first surface 221 and the second surface 222; wherein at least part of the radiation emitted by the radiation source 111 passes through the first surface 221, the calibration portion 223, and the second surface 222 in sequence and is received by the detector 112.

[0104] Reference Figure 8 The first surface 221 may be the surface of the calibration block 225 facing the radiation source 111, and the second surface 222 may be the surface of the calibration block 225 facing the detector 112. Furthermore, the second surface 222 may be the surface in contact with the substrate 224. The calibration portion 223 may be located in the interlayer between the first surface 221 and the second surface 222. Figure 8 , the area of ​​each calibration portion 223 may be smaller than the area of ​​the first surface 221 or the second surface 222. Each calibration portion 223 is disposed in a local area of ​​the calibration block 225, and its orthographic projection may overlap with the orthographic projection of the first surface 221 or the second surface 222 and have a smaller projection area.

[0105] In other embodiments, the area of ​​the calibration portion 223 of each calibration block 225 may be the same as that of the first surface 221 or the second surface 222, that is, the orthographic projection of each calibration portion 223 may overlap with the orthographic projection of the first surface 221 or the second surface 222 and the projection areas are substantially equal.

[0106] For example, the calibration part 223 may have the same or different material as the base 224 of the calibration piece 220. For example, the ray source 111 emits X-rays. Since the calibration part 223 is made of a different material than the base 224, their responses to the X-rays will also be different, thereby having different representations in the radiation image, which helps to obtain accurate calibration data. For example, the base 224 is made of aluminum, and the calibration block 225 is made of steel, copper or non-metallic materials (for example only).

[0107] Exemplarily, the calibration unit 223 is used to characterize and provide calibration reference information in the radiation image as a reference for the calibration work. During the calibration process, the rays pass through the first surface 221, the calibration unit 223, and the second surface 222 in sequence and are received by the detector 112. The calibration unit 223, as a characteristic part, can be scanned and imaged by the radiation imaging device 110 and recognized by the control unit 130 to obtain calibration data. Through the calibration reference information provided by one or more calibration units 223, accurate calibration data can be obtained to calibrate the radiation imaging device 110.

[0108] For another example, the calibration unit 223 can simulate the structure of the interlayer in the scanned object, such as simulating at least one of the position, shape, size, material, etc., so that the actual radiation scanning scene can be simulated during the calibration process. The structure of the calibration unit 223 can include grooves, holes, protrusions, or structures with regular shapes.

[0109] According to an embodiment of the present disclosure, a calibration portion 223 is set between the first surface 221 and the second surface 222 of the calibration block 225. Combined with the characteristics of X-ray tomography or transmission scanning, it can help simulate the actual radiation imaging scene during the calibration process, improve the quality of radiation imaging, and achieve a better calibration effect.

[0110] In some embodiments, the orthographic projection of the calibration portion 223 does not overlap with the orthographic projection of the substrate 224. This means that after the rays pass through the first surface 221, the calibration portion 223, and the second surface 222 in sequence, they can be received by the detector 112 without passing through the substrate 224, so that an accurate image of the calibration portion 223 can be obtained in the radiation image, which is conducive to eliminating the interference of the substrate 224 and improving the accuracy of obtaining the calibration data. In addition, during scanning, only the calibration portion 223 can be placed in the scanning area of ​​the radiation imaging device 110, and the substrate 224 can be placed outside the scanning area to simulate the actual scanning scene of the battery cell, or reduce the workload of the radiation imaging device 110 and the computing resources of the control unit 130.

[0111] Fig. 9 Schematically shows Figure 8 The front view and top view of one of the calibration blocks 225 of the calibration component 220. Specifically, Fig. 9 (a) a top view including the calibration block 225 - 4 , Fig. 9 (b) A front view including the calibration block 225 - 4 .

[0112] In some embodiments, the calibration block 225 includes a first connection portion 2251. The first connection portion 2251 is detachably connected to the base 224; wherein the first connection portion 2251 and the calibration portion 223 are located in different independent regions, so that the related mechanical parts in the first connection portion are excluded from the radiation image. Fig. 9 In (a), different areas are separated by dotted lines. It can be understood that the dotted lines are for illustration only and their positions do not constitute a limitation to the present disclosure.

[0113] In some embodiments, the base 224 includes: at least one second connection portion 2241 corresponding to at least one calibration block 225 ; wherein each second connection portion 2241 is detachably connected to the first connection portion 2251 of the corresponding calibration block 225 .

[0114] In some embodiments, each second connection portion 2241 includes a recessed portion, and each second connection portion 2241 is detachably connected to the first connection portion 2251 of the corresponding calibration block 225, including: the first connection portion 2251 of the corresponding calibration block 225 is basically placed in the recessed portion and is detachably connected to the recessed portion.

[0115] Reference Figure 8 and Fig. 9 Each calibration block 225 is placed in the corresponding recessed portion, and then screws and positioning pins are used to pass through the first connecting portion 2251 of the calibration block 225 to connect with the recessed portion. For example, each calibration block 225 is positioned using two positioning pins and fixed to the base 224 with screws.

[0116] In some embodiments, different from Figure 8 The connection method shown is, for example, bonding the end of each calibration block 225 to the end of the substrate 224 so that the orthographic projection of the calibration block 225 is in contact with the orthographic projection of the substrate 224 but does not overlap.

[0117] In some embodiments, the portion to be detected of the scanned object includes a first corner region, and the calibration portion 223 of the calibration block 225 is located in a second corner region of the calibration member 220 corresponding one-to-one to the first corner region.

[0118] For example, when the scanning object is a battery cell, the part to be detected is located at one or more corners (i.e., the first corner region) of the battery cell, and a calibration block 225 is set in the calibration member 220 in a one-to-one correspondence with the second corner region, and the calibration block 225 refers to the calibration part 223 corresponding to the part to be detected. Figure 8 The calibration piece 220 is hollowed out in the middle to reduce the overall weight, and calibration blocks 225 - 1 , 225 - 2 , 225 - 3 and 225 - 4 are respectively arranged at the four second corner areas, and each calibration block 225 is provided with a calibration portion 223 .

[0119] The part to be tested of the battery cell may include the battery cell pole pieces and impurities in the battery cell. The calibration unit 223 can simulate the structure of the part to be tested, for example, simulating at least one item of the position, shape, size, material, etc. of the battery cell pole pieces at the part to be tested, thereby simulating the actual radiation scanning scene during the calibration process.

[0120] According to the embodiments of the present disclosure, the part to be detected of the simulated scanning object can provide deterministic information in the calibration data, thereby reducing the amount of calculation and calculation errors.

[0121] In some embodiments, the marking portion 223 includes one or more grooves. In the case of including a plurality of grooves, at least two grooves have different depths.

[0122] In some embodiments, a plurality of grooves are stacked along the path of the ray, that is, the ray passes through the plurality of grooves in sequence.

[0123] Among them, the embodiments and effects of the grooves in the calibration part 223 can refer to the embodiments and effects of the calibration part 123 above, that is, the description of the depth and stacking of multiple grooves in the first implementation of the calibration part 220 is introduced into the second implementation of the calibration part 220.

[0124] In some embodiments, the number of calibration blocks 225 is substantially consistent with the number of parts to be detected located on the scan object; and / or, the number of calibration blocks 225 is in a predetermined multiple relationship with the number of parts to be detected located on the scan object.

[0125] The number is substantially the same, including that the difference between the number of the calibration blocks 225 and the number of the parts to be detected on the scanned object is less than a target value, for example, the target value is 1. The predetermined multiple relationship is, for example, that the number of the calibration blocks 225 is 0.5 times, 1 times, or 2 times the number of the parts to be detected on the scanned object, which is only an example. For example, each calibration block 225 can be provided with one calibration part 223.

[0126] According to the embodiments of the present disclosure, by simulating the number of parts to be detected of the scanned object in the actual scanning scene, accurate reference data can be provided in the quantity dimension, which is beneficial to calibration. For example, when the number of calibration blocks 225 and the number of parts to be detected are substantially consistent or have a predetermined multiple relationship, the number of calibration parts 223 included in the radiation image during the calibration process can be more consistent with the number of parts to be detected included in the radiation image in the actual scanning scene, thereby achieving a better calibration effect.

[0127] In some embodiments, the multiple calibration blocks 225 correspond one-to-one to the multiple parts to be detected located on the scanned object, wherein the spatial distribution of each calibration block 225 on the calibration member 220 is substantially consistent with the spatial distribution of the corresponding part to be detected on the scanned object.

[0128] Spatial distribution refers to the layout, position and arrangement of the calibration block 225 in the calibration object 220, or the layout, position and arrangement of the part to be detected in the scanned object. For example, multiple parts to be detected of the battery cell are distributed in diagonal or four corner areas, such as Figure 8 As shown, the plurality of calibration blocks 225 may be located at diagonal corners or four corner regions of the calibration member 220 .

[0129] According to the embodiments of the present disclosure, by simulating the spatial distribution of the to-be-detected portion of the scanned object in the actual scanning scene, accurate reference data can be provided in the spatial dimension, which is beneficial for calibration.

[0130] In some embodiments, the calibration portion 223 of each calibration block 225 has a substantially identical shape to the corresponding portion to be detected, and / or the size of the calibration portion 223 of each calibration block 225 has a predetermined proportional relationship to the size of the corresponding portion to be detected.

[0131] The relationship between the size of each calibration portion 223 and the size of the corresponding portion to be detected is determined by the relationship between the size of the calibrated object 220 and the size of the scanned object.

[0132] For example, when the scanned object is a battery cell, the calibration unit 223 includes a plurality of calibration sheets, which correspond to the plurality of pole pieces of the battery cell one by one, that is, each calibration sheet has a substantially identical shape to the corresponding pole piece, and / or the size of each calibration sheet has a predetermined proportional relationship to the size of the corresponding pole piece. The material of the calibration sheet can be consistent with the material of the pole piece, or can be made of copper, aluminum, etc. The material of the calibration sheet can be different from the material of the substrate 224 of the calibration member 220.

[0133] According to the embodiments of the present disclosure, by maintaining at least one of the shape relationship and the size relationship between the calibration portion 223 and the portion to be detected, not only can the measurement accuracy be improved and the accuracy of the measurement result be ensured, but also the calibration effect can be enhanced and the calibration can be performed more accurately.

[0134] In some embodiments, the calibration parts 223 of any two calibration blocks 225 are separated by a first distance, and the first distance has a predetermined proportional relationship with a second distance between the to-be-detected parts corresponding to the calibration parts 223 of the two calibration blocks 225 .

[0135] For example, when the scanning object is a battery cell, each diagonal corner of the battery cell has a portion to be detected, and each diagonal corner of the calibration piece 220 has a corresponding calibration portion 223, wherein the first distance between the two calibration portions 223 and the second distance between the two portions to be detected have a predetermined proportional relationship.

[0136] According to an embodiment of the present disclosure, based on the first distance between any two calibration parts 223, the distance relationship between the corresponding parts to be detected in the actual scanning scene can be simulated, thereby achieving high-precision calibration based on the spatial distribution, shape, size of each calibration part 223 and the distance relationship between the calibration parts 223.

[0137] Calibration Part Example 3

[0138] Fig.10 The three views of the calibration component 320 according to the third embodiment of the present disclosure are schematically shown. Fig.10 (a) shows a top view of the calibration piece 320, Fig.10 (b) shows a front view and a partial cross-sectional view of the calibration component 320, Fig.10 (c) shows a side view and a partial cross-sectional view of the calibration component 320 .

[0139] In some embodiments, the calibration piece 320 includes a base 324, at least one of whose shape and size is variable; at least one calibration block 325 (such as calibration block 325_1, calibration block 325_2, calibration block 325_3, calibration block 325_4), wherein each calibration block 325 is connected to the base 324; wherein at least one of the shape and size of the base 324 is pre-adjusted according to the scanning object of the radiation imaging device 110 to be calibrated, so that the calibration piece 320 has a basically consistent shape with the scanning object, and the size of the calibration piece 320 has a predetermined proportional relationship with the size of the scanning object.

[0140] The base 324 is the main body of the calibration piece 320, and at least one of the shape and size of the base 324 is variable, including: the base 324 includes a variable state, which can adjust at least one of the shape and size; the base 324 also includes a holding state, which can keep the shape and size unchanged after contacting the variable state. Thus, the calibration piece 320 and the scanned object have a specific relationship between shape and size. The calibration block 325 is used to provide feature information for obtaining calibration data, and the feature information can be represented in the radiation image.

[0141] For example, the base 324 may be made of metal materials (such as copper, steel, etc.) to ensure its stability and durability. The design of the base 324 may include multiple mounting slots or interfaces to accommodate calibration blocks 325 of different shapes and sizes. The calibration block 325 may be made of a material similar to the scanned object to improve its similarity during the imaging process.

[0142] In some embodiments, the base 324 may include a retractable frame structure, which may be designed as a frame composed of a plurality of retractable mechanisms. Each retractable mechanism may be adjusted in length by a built-in mechanical or electric retractable mechanism, thereby changing the overall size of the base 324.

[0143] For example, refer to Fig.10 The base 324 includes a first telescopic mechanism 326. The first telescopic mechanism 326 is configured to move along a first direction (eg Fig.10 wherein the first telescopic mechanism 326 is connected to N calibration blocks 325, where N is an integer greater than or equal to 1.

[0144] For example, refer to Fig.10 The base 324 further includes a second telescopic mechanism 327. The second telescopic mechanism 327 is configured to extend along a second direction (such as Fig.10 The second telescopic mechanism 327 is connected to M calibration blocks 325, and M is an integer greater than or equal to 1.

[0145] The first telescopic mechanism 326 includes two opposite Fig.10 (a) The telescopic sections are arranged up and down, and the second telescopic mechanism 327 includes two opposite Fig.10 (a) The telescopic sections arranged on the left and right sides, the telescopic section of the first telescopic mechanism 326 and the telescopic section of the second telescopic mechanism 327 are connected by the second connecting portion 3241, forming a Fig.10 The rectangular telescopic frame structure shown.

[0146] Each telescopic section can be a tubular structure made of steel pipe, aluminum pipe or other high-strength material, and can be extended and retracted by a built-in mechanical structure or electric mechanism. For example, a threaded rotation mechanism can be used to adjust the length of the telescopic section by rotation; or, the telescopic section can be extended and retracted by a set screw control method, such as Fig.10 As shown, each telescopic section includes a connecting portion and telescopic portions on both sides of the connecting portion, wherein the telescopic portion extends into the sleeve-shaped connecting portion, and a set screw is provided to pass through the connecting portion to fix the telescopic portion, and the telescopic portion is manually controlled by loosening the set screw. Each second connecting portion 3241 is located on the connecting block 328. The connecting block 328 is connected to the telescopic portion by means of screws, straight-mouth positioning threads, gluing, integration, and welding.

[0147] For example, the base 324 may also include a folding structure, which may be formed by a plurality of plates or sheets connected by hinges, and these plates or sheets may be increased, reduced or replaced, and folded or unfolded to adapt to different size and shape requirements.

[0148] For example, the base 324 may also include an inflatable structure, which includes an outer skin made of a ductile material (such as rubber or plastic) and changes size and shape by inflation and deflation.

[0149] For example, the base 324 may also include an adjustable support structure, including a plurality of adjustment points, which may be rotation joints, sliding slots, or telescopic mechanisms. By operating these adjustment points, the overall shape and size of the support may be changed.

[0150] According to an embodiment of the present disclosure, the calibration piece 320 has a specific relationship with the scanned object in shape and size. During calibration, the actual conditions for performing radiation imaging on the scanned object can be more accurately simulated, and calibration data that meets the requirements can be obtained more quickly, thereby reducing the amount of data calculation and calculation errors, effectively shortening the calibration time, and helping to improve the calibration accuracy of at least one of geometric calibration, mechanical calibration, and image calibration, so that the radiation imaging device 110 can achieve high-precision radiation scanning imaging, thereby improving the quality of radiation imaging.

[0151] In addition, by providing a base 324 with at least one variable shape and size, the shape and size of the calibration member 320 can be changed to meet the calibration requirements of scanning objects of different specifications.

[0152] In some embodiments, reference Fig.10 The calibration block 325 includes a calibration portion 323, a first surface 321, and a second surface 322. The second surface 322 is opposite to the first surface 321; the calibration portion 323 is located between the first surface 321 and the second surface 322; wherein at least part of the rays emitted by the ray source 111 sequentially pass through the first surface 321, the calibration portion 323, and the second surface 322 to be received by the detector 112. Reference may be made to the calibration block 225, the calibration portion 223, the first surface 221, and the second surface 222 in the calibration component embodiment 2, as well as the corresponding structural relationships, examples, and technical effects.

[0153] In some embodiments, the orthographic projection of the calibration part 323 does not overlap with the orthographic projection of the base 324. Reference may be made to the orthographic projection of the calibration part 223 and the orthographic projection of the base 224 in the second calibration component embodiment, as well as the corresponding structural relationship, examples and technical effects.

[0154] Fig.11 Schematically shows Fig.10 The front view and top view of one of the calibration blocks 325 of the calibration component 320. Specifically, Fig.11 (a) a top view including the calibration block 325 - 4 , Fig.10 (b) A front view including the calibration block 325 - 4 .

[0155] In some embodiments, the calibration block 325 includes a first connection portion 3251. The first connection portion 3251 is detachably connected to the base 324; wherein the first connection portion 3251 and the calibration portion 323 are located in different independent regions. Fig.11 The different regions separated by dashed lines in (a) are understood to be for illustration only and their positions do not constitute a limitation on the present disclosure. Reference may be made to the relationship between the first connecting portion 2251, the calibration portion 223, and the base 224 in the second embodiment of the calibration member, as well as the corresponding structural relationship, examples, and technical effects.

[0156] In some embodiments, the base 324 includes: at least one second connection part 3241, corresponding to at least one calibration block 325; wherein each calibration block 325 is connected to the base 324 including: the first connection part 3251 of each calibration block 325 and the second connection part 3241 corresponding to the calibration block 325 are integrally formed; or, the first connection part 3251 of each calibration block 325 and the second connection part 3241 corresponding to the calibration block 325 are detachably connected. Reference may be made to the relationship between the first connection part 2251, the second connection part 2241, the calibration block 225, and the base 224 in the second embodiment of the calibration component, as well as the corresponding structural relationship, example description, and technical effect.

[0157] In some embodiments, each second connection part 3241 includes a recessed part, and each second connection part 3241 is detachably connected to the first connection part 3251 of the corresponding calibration block 325, including: the first connection part 3251 of the corresponding calibration block 325 is basically placed in the recessed part and is detachably connected to the recessed part. Reference may be made to the relationship between the first connection part 2251, the second connection part 2241, and the recessed part in the second embodiment of the calibration member, as well as the corresponding structural relationship, example description, and technical effect.

[0158] In some embodiments, the portion to be detected of the scanned object includes a first corner region, and the calibration portion 323 of the calibration block 325 is located in a second corner region of the calibration member 320 that corresponds to the first corner region. Reference may be made to the relationship between the first corner region and the second corner region of the calibration member embodiment 2, as well as the corresponding structural relationship, example description, and technical effects.

[0159] In some embodiments, the marking portion 323 includes one or more grooves. In the case of including a plurality of grooves, at least two grooves have different depths.

[0160] In some embodiments, a plurality of grooves are stacked along the path of the ray, that is, the ray passes through the plurality of grooves in sequence.

[0161] The embodiments and effects of the grooves in the calibration part 323 can refer to the embodiments and effects of the calibration part 123 above, that is, the description of the depth and stacking of the multiple grooves in the calibration part embodiment 1 is introduced into the calibration part embodiment 3.

[0162] In some embodiments, the number of calibration blocks 325 is substantially consistent with the number of parts to be detected located on the scanned object; and / or, the number of calibration blocks 325 is in a predetermined multiple relationship with the number of parts to be detected located on the scanned object. The description of the number of calibration blocks 225 corresponding to the number of parts to be detected located on the scanned object in the second calibration component embodiment, such as the description of examples and technical effects, can be introduced into the third calibration component embodiment.

[0163] In some embodiments, the plurality of calibration blocks 325 correspond one-to-one to the plurality of parts to be detected located on the scanned object, wherein the spatial distribution of each calibration block 325 on the calibration member 320 is substantially consistent with the spatial distribution of the corresponding part to be detected on the scanned object. The description of the spatial distribution relationship between the calibration block 225 and the part to be detected in the calibration member embodiment 2 may be referred to, such as the description of examples and technical effects, which are introduced into the calibration member embodiment 3.

[0164] In some embodiments, the calibration portion 323 of each calibration block 325 has a substantially identical shape to the corresponding part to be detected, and / or the size of the calibration portion 323 of each calibration block 325 has a predetermined proportional relationship to the size of the corresponding part to be detected. The description of the shape relationship and size relationship between the calibration portion 223 and the corresponding part to be detected in the calibration component embodiment 2 may be referred to, such as the description of examples and technical effects, which are introduced into the calibration component embodiment 3.

[0165] In some embodiments, the calibration parts 323 of any two calibration blocks 325 are separated by a first distance, and the first distance has a predetermined proportional relationship with a second distance between the parts to be detected corresponding to the calibration parts 323 of the two calibration blocks 325. The description of the shape relationship and size relationship between the calibration parts 223 and the corresponding parts to be detected in the second calibration component embodiment can be referred to, such as the description of examples and technical effects, etc., which are introduced into the third calibration component embodiment.

[0166] It should be noted that the features in the calibration component embodiment 1, calibration component embodiment 2, and calibration component embodiment 3 of the present disclosure can be combined and / or combined in various ways, the same structure can have the same or similar technical effects in different embodiments, and the corresponding descriptions can be universal in different embodiments.

[0167] It should be noted that the shape of the calibration piece is not limited to Figure 2~Figure 7 , Figure 8 , Fig.10 As shown, its shape can be flexibly determined according to different scanning objects. The number, position and structure of the calibration part are also not limited to Figure 2~Figure 7 , Figure 8 , Fig.10 As shown, they may correspond one-to-one with the part to be detected on the scanned object, or they may not correspond.

[0168] In combination with the calibration parts 120, 220 and 320 in the calibration part embodiment 1, the calibration part embodiment 2 and the calibration part embodiment 3, in some embodiments, the battery cell includes a positive electrode and a negative electrode. When testing the corner of the battery cell (i.e., the part to be tested), multiple battery cells can be placed. For any two adjacently placed battery cells, one corner of one battery cell is adjacent to and spaced from one corner of another battery cell. In each test, the corner where the positive electrode of one battery cell is located and the corner where the negative electrode of another battery cell is located are tested simultaneously. Accordingly, multiple calibration parts (such as at least one of the calibration parts 120, 220 and 320) can be placed. For any two adjacently placed calibration parts, one corner of one calibration part is adjacent to and spaced from one corner of another calibration part. The corner of the calibration piece that is scanned by radiation includes a calibration part. In one calibration, the corner where the calibration part of one calibration piece is located and the corner where the calibration part of another calibration piece is located are detected simultaneously. In some embodiments, the sizes of any two calibration pieces placed adjacent to each other can be the same or different. When they are different, the calibration of radiation imaging of scanned objects of multiple sizes can be provided simultaneously in one calibration, thereby improving the calibration efficiency.

[0169] In combination with the calibration parts 120, 220 and 320 in the calibration part embodiment 1, the calibration part embodiment 2 and the calibration part embodiment 3, the following further describes how to use the calibration data to perform at least one of geometric calibration, mechanical calibration and image calibration. The following calibration part includes at least one of the calibration part 120, the calibration part 220 and the calibration part 320.

[0170] In some embodiments, reference Figure 1 The calibration system 100 further includes: a first motion mechanism 140 and a second motion mechanism 150 spaced apart from the first motion mechanism 140. The first motion mechanism 140 is used to transport the calibration object to the second motion mechanism 150 via a spaced area between the first motion mechanism 140 and the second motion mechanism 150; wherein, when the calibration portion on the calibration object is located in the spaced area, the radiation imaging device 110 is configured to scan the calibration portion.

[0171] Reference Figure 8 or Fig. 9 When any calibration block on the calibration piece is located in the spacing area, the radiation imaging device 110 is configured to scan the calibration portion on the calibration block.

[0172] The first motion mechanism 140 and the second motion mechanism 150 can be linear motion mechanisms respectively, for example, the calibration piece can be transported by moving a conveyor belt.

[0173] In some embodiments, mechanical calibration is implemented based on calibration data, for example, the calibration data is used to calibrate at least one of the following: the transport speed of the first motion mechanism 140 , the transport speed of the second motion mechanism 150 , and the consistency of the transport speeds of the first motion mechanism 140 and the second motion mechanism 150 .

[0174] When the calibration part is located in the spacing area, the radiation imaging device 110 may perform radiation scanning on the calibration part to avoid other noises other than the calibration part in the radiation image.

[0175] For example, the first motion mechanism 140 transports at least one calibration piece it carries, and when the calibration portion of each calibration piece is located at the center of the scanning area of ​​the radiation imaging device 110, the radiation imaging device 110 sends radiation to scan the calibration portion, for example, to scan multiple grooves in the calibration portion. Then, the first motion mechanism 140 transports each calibration piece to the second motion mechanism 150, and the second motion mechanism 150 transports each calibration piece to a designated position. The first motion mechanism 140 and the second motion mechanism 150 maintain the same transport speed so that each calibration piece can be smoothly transferred between the motion mechanisms.

[0176] The calibration piece has a substantially identical shape to the scanned object of the radiation imaging device 110 to be calibrated, and the size of the calibration piece has a predetermined proportional relationship to the size of the scanned object. The structure, position, shape and size of the calibration part of the calibration piece can simulate the part to be detected of the scanned object, so by collecting the actual transport speed of the first motion mechanism 140 and the second motion mechanism 150, combined with the time when the calibration part is transported to the scanning area or the center of the scanning area, the offset between the position of the calibration part when scanned and the center of the scanning area, and the image information of the calibration part in the radiation image, at least one of the transport speed of the first motion mechanism 140, the transport speed of the second motion mechanism 150, and the consistency of the transport speeds of the first motion mechanism 140 and the second motion mechanism 150 can be calibrated.

[0177] According to the embodiments of the present disclosure, it is possible to provide multi-dimensional information having a deterministic relationship with the actual scanning scene by simulating the actual scanning scene, which is beneficial for calibrating the parameters of the first motion mechanism 140, the second motion mechanism 150 and other mechanical equipment during their operation, thereby improving the operating accuracy of the first motion mechanism 140 and the second motion mechanism 150.

[0178] In some embodiments, the radiation imaging device 110 includes: a radiation source 111, a detector 112 and an annular rotating disk 113, wherein the annular rotating disk 113 is used to install the radiation source 111 and the detector 112, wherein the annular rotating disk 113 is configured to rotate circumferentially around the spacing area; wherein the first motion mechanism 140 is used to move axially along the annular rotating disk 113 to transport the calibration part to the second motion mechanism 150 through the spacing area.

[0179] Reference Figure 1 The radiation imaging device 110 further includes a support mechanism 114 for supporting an annular rotating disk 113. The annular rotating disk 113 can rotate circumferentially relative to the support mechanism 114. The annular rotating disk 113 is annular and includes a detection channel therein. The annular rotating disk 113 is configured to rotate circumferentially around the detection channel. The spacing area is located in the detection channel of the annular rotating disk 113.

[0180] First, at least one calibration piece is placed on the first motion mechanism 140, and the first motion mechanism 140 moves along the axial direction of the annular rotating disk 113 to transport the calibration portion of at least one calibration piece to the spacing area. When multiple calibration pieces are placed, the calibration portions of any two adjacent calibration pieces can be placed in the spacing area at the same time, such as the corner areas of the adjacent calibration pieces. Then, the annular rotating disk 113 rotates, and during the rotation process, the radiation source 111 sends a radiation beam to perform a tomographic scan on one or more calibration portions, and the detector 112 receives the radiation beam and converts it into an electrical signal, thereby obtaining a radiation image.

[0181] For example, the ray source 111 may include a single focus or a distributed multi-focus. In the case where the ray source 111 is a distributed multi-focus, different calibrated parts or different grooves in the same calibrated part may be scanned simultaneously using different foci. Thus, it is possible to detect different positions of multiple calibrated parts, different positions of the same calibrated part or different positions of the same calibrated part at the same time.

[0182] For example, using Figure 8 When calibrating the calibration piece shown, the substrate of different shapes or sizes can be replaced, and the calibration block of different shapes or sizes can be replaced to provide calibration pieces of different specifications. The radiation imaging device 110 can obtain radiation images of calibration pieces of different specifications to provide more comprehensive data for calibration. Fig.10When the calibration piece shown is calibrated, at least one of the shape and size of the substrate can be adjusted multiple times, and calibration pieces of different specifications are provided. The radiation imaging device 110 can obtain radiation images of calibration pieces of different specifications, providing more comprehensive data for calibration. Wherein, when calibration pieces of different specifications are provided, the same calibration piece can include multiple identical or different calibration blocks. Different calibration pieces can include multiple identical or different calibration blocks, and the radiation imaging device 110 obtains more comprehensive data by scanning.

[0183] In some embodiments, the first motion mechanism 140 and the second motion mechanism 150 are transported in stepping manner; the calibration data is used to calibrate at least one of the following: the rotation speed of the annular rotating disk 113, the consistency between the rotation speed of the annular rotating disk 113 and the stepping interval time of the first motion mechanism 140, and the consistency between the rotation speed of the annular rotating disk 113 and the stepping interval time of the second motion mechanism 150.

[0184] Stepping transport includes the transport mode realized by stepping motor or other intermittent motion mechanism. The stepping intermittent time includes the time interval between two adjacent stepping motions.

[0185] For example, when the first motion mechanism 140 transports the calibration part of at least one calibration piece to the interval area, and then performs an interval time, the annular rotating disk 113 rotates, and rotates a predetermined angle (such as 90 degrees, 180 degrees or 360 degrees, etc.) during the interval time to complete the scanning of the calibration part in the interval area. Then the first motion mechanism 140 ends the interval time, and through one or more stepping movements, each calibration piece is transferred to the second motion mechanism 150 for continued transportation, so as to realize continuous scanning of multiple calibration pieces in a cycle.

[0186] It can be seen that the rotation speed of the annular rotating disk 113 is coordinated with the stepping interval of the first motion mechanism 140 or the stepping interval of the second motion mechanism 150. For example, within the stepping interval, the annular rotating disk 113 rotates a specific number of times, such as 1 or more, at a set rotation speed, and can obtain a radiation image that meets the quality requirements.

[0187] For example, calibration data is obtained by collecting the actual rotation speed of the annular rotating disk 113, the stroke of each stepping motion of the first motion mechanism 140 or the second motion mechanism 150, the stepping interval of the first motion mechanism 140 or the second motion mechanism 150, and the quality and image parameters of the radiation image during the calibration process, combined with the target quality and image parameters of the radiation image. The quality and image parameters of the radiation image can be obtained by extracting the image features of the calibration part (such as the features of multiple grooves of different depths).

[0188] For example, the calibration data is used to calibrate the step control algorithm, such as calibrating the frequency and quantity of the step motion pulse signal, and the calibration data is used to calibrate the rotation speed and step interval time of the annular rotating disk 113 .

[0189] According to the embodiments of the present disclosure, the calibration piece provided has a specific relationship with the shape and size of the scanned object, and the synchronization between the first motion mechanism 140, the second motion mechanism 150 and the radiation scanning device can be improved through calibration, thereby avoiding the occurrence of asynchrony during the actual radiation scanning process. In addition, the radiation scanning accuracy can be improved, and the error accumulation in the actual scanning scene can be reduced.

[0190] In some embodiments, the radiation imaging device 110 may also be geometrically calibrated. For example, according to the initial parameters of the radiation source 111, the initial parameters of the detector 112, and the positional relationship of the calibration part of the calibration piece relative to the radiation source 111 and the detector 112, the theoretical projection position of the calibration part on the detector 112 is obtained through geometric calculation; according to the actual projection position and the theoretical projection position measured during the calibration process, the radiation source 111 parameters and the detector 112 parameters are calibrated to obtain optimized radiation source 111 parameters and optimized detector 112 parameters; the optimized radiation source 111 parameters and the optimized detector 112 parameters are determined as geometric calibration parameters.

[0191] For example, the calibration part has a plurality of calibration parts, and the plurality of calibration parts are respectively located at different positions in the detection channel of the radiation scanning device. Each calibration part has a different positional relationship with the radiation source 111 and the detector 112, which is conducive to obtaining calibration data from multiple different geometric positions. In addition, each calibration part includes a plurality of grooves, wherein at least two grooves have different depths, and the plurality of grooves are stacked. Therefore, the positional relationship between each groove of each calibration part and the radiation source 111 and the detector 112 is different, and the difference in groove depth is combined with the difference in the calibration accuracy, which is conducive to improving the calibration accuracy and realizing high-precision radiation imaging after calibration.

[0192] In some embodiments, the radiation image can also be calibrated. For example, the detector 112 collects rays passing through the scanning area (such as the above-mentioned spacing area) to obtain the actual projection data of each calibration part; based on the actual projection data, the calibration phantom is reconstructed using an image reconstruction algorithm to obtain a radiation image; the physical property measurement values ​​corresponding to each calibration part are calculated respectively; and calibration data is generated based on the physical property theoretical value and physical property measurement value corresponding to each calibration part. Among them, the physical property theoretical value and physical property measurement value corresponding to each calibration part include: the physical property theoretical value and physical property measurement value corresponding to each groove.

[0193] For example, by providing a calibration part having a specific relationship with the shape and size of the scanned object, wherein at least one of the number, spatial distribution, shape or structure of the calibration part also has a characteristic relationship with the part to be detected of the scanned object, the required calibration data can be read in the actual image reconstruction process, which is conducive to improving the accuracy of image reconstruction.

[0194] Based on the above calibration component and calibration system 100 , the present disclosure also provides calibration methods in multiple embodiments.

[0195] Calibration method embodiment 1

[0196] Fig.12 The flowchart of the calibration method according to the first embodiment of the present disclosure is schematically shown.

[0197] In operation S1210, a calibration part is selected based on a scanning object of the radiation imaging device to be calibrated, wherein the selected calibration part has a shape substantially consistent with the scanning object of the radiation imaging device to be calibrated, and a size of the calibration part has a predetermined proportional relationship with a size of the scanning object; the calibration part of this embodiment may be the calibration part described in the above-mentioned calibration part embodiment 1.

[0198] For example, for objects of different specifications and types to be inspected, the scanning object of the radiation imaging device is determined. Then, according to the shape and size of the scanned object, a calibration piece having a specific relationship with it is selected. The specific relationship includes that the shape is basically consistent and the size has a predetermined ratio.

[0199] In operation S1220, calibration data is acquired using a calibration system, such as a calibration system according to one or more embodiments of the present disclosure.

[0200] In some embodiments, obtaining calibration data using the calibration system includes: placing the calibration piece on a first motion mechanism. The first motion mechanism transports the calibration portion of the calibration piece to a scanning area of ​​a radiation scanning device. The radiation scanning device sends radiation to scan the calibration portion, which is received by a detector, thereby obtaining a radiation image. Using a control unit to obtain calibration data based on the radiation image, and then performing at least one of geometric calibration, mechanical calibration, and image calibration.

[0201] According to the embodiments of the present disclosure, the calibration part and the scanned object have a specific relationship in shape and size. During calibration, the actual conditions for performing radiation imaging on the scanned object can be simulated more accurately, and calibration data that meets the requirements can be obtained more quickly, reducing the amount of data calculation and calculation errors, effectively shortening the calibration time, and helping to improve the calibration accuracy of at least one of geometric calibration, mechanical calibration, and image calibration, so that the radiation imaging equipment can achieve high-precision radiation scanning imaging, thereby improving the quality of radiation imaging.

[0202] Calibration method embodiment 2

[0203] Fig.13 A flowchart of a calibration method according to the second embodiment of the present disclosure is schematically shown.

[0204] In operation S1310, a shape and / or size of at least one of a base and a calibration block is determined according to a scanning object of a radiation imaging device to be calibrated.

[0205] In operation S1320, at least one calibration block is detachably connected to the base to obtain a calibration piece, wherein the calibration piece and the scanned object have substantially the same shape, and the size of the calibration piece and the size of the scanned object have a predetermined proportional relationship; the calibration piece of this embodiment may be the calibration piece described in the above-mentioned calibration piece embodiment 2.

[0206] For example, for objects of different specifications and types to be inspected, the scanning object of the radiation imaging device is determined. Then, according to the shape and size of the scanned object, a suitable substrate and at least one calibration block are selected, and the substrate and at least one calibration block are detachably connected to obtain a calibration piece, which is substantially consistent with the shape of the scanned object and has a predetermined proportional relationship in size. When the calibration piece includes multiple calibration blocks, the shapes of any two calibration blocks may be the same or different, and the sizes may also be the same or different.

[0207] In operation S1330, calibration data is acquired using a calibration system, such as a calibration system according to one or more embodiments of the present disclosure.

[0208] Calibration method embodiment 3

[0209] Fig.14 The flowchart of the calibration method according to the third embodiment of the present disclosure is schematically shown.

[0210] In operation S1410, at least one of a shape and a size of a substrate is adjusted according to a scanning object of a radiation imaging device to be calibrated, wherein at least one of the shape and the size of the substrate is variable.

[0211] In operation S1420, at least one calibration block is connected to a substrate to obtain a calibration piece, wherein the calibration piece and the scanned object have substantially the same shape, and the size of the calibration piece and the size of the scanned object have a predetermined proportional relationship; the calibration piece of this embodiment may be the calibration piece described in the above-mentioned calibration piece embodiment 3.

[0212] In operation S1430, calibration data is acquired using a calibration system, such as a calibration system according to one or more embodiments of the present disclosure.

[0213] The flow charts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flow chart or block diagram can represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flow chart, and the combination of the boxes in the block diagram or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0214] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations and / or combinations are not explicitly described in the present disclosure. In particular, the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways without departing from the spirit and teachings of the present disclosure. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0215] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present disclosure is defined by the attached claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A calibration component, characterized in that: The calibration piece and the scanned object of the radiation imaging device to be calibrated have substantially the same shape, and the size of the calibration piece and the size of the scanned object have a predetermined proportional relationship.

2. The calibration piece according to claim 1, characterized in that: The calibration part comprises: a first surface; a second surface, opposite to the first surface; a calibration portion, located between the first surface and the second surface; Wherein, at least part of the radiation emitted by the radiation source of the radiation imaging device passes through the first surface, the calibration part and the second surface in sequence and is received by the detector of the radiation imaging device.

3. The calibration piece according to claim 2, characterized in that: The marking portion includes a plurality of grooves, wherein at least two of the grooves have different depths.

4. The calibration piece according to claim 3, characterized in that: The plurality of grooves are stacked along the path of the ray.

5. The calibration piece according to claim 2, characterized in that: The number of the calibration parts is substantially consistent with the number of the parts to be detected located on the scanned object; and / or, The number of the calibration parts has a predetermined multiple relationship with the number of the to-be-detected parts located on the scan object.

6. The calibration piece according to claim 5, characterized in that: The plurality of calibration portions correspond one-to-one to the plurality of to-be-detected portions located on the scanned object, wherein: The spatial distribution of each calibration portion on the calibration member is substantially consistent with the spatial distribution of the corresponding portion to be detected on the scanned object.

7. The calibration piece according to claim 6, characterized in that: Each of the calibration portions has a substantially identical shape to the corresponding portion to be detected, and / or a size of each of the calibration portions has a predetermined proportional relationship to a size of the corresponding portion to be detected.

8. The calibration piece according to claim 6, characterized in that: There is a first distance between any two calibration parts, and the first distance has the predetermined proportional relationship with a second distance between two to-be-detected parts corresponding to the two calibration parts.

9. The calibration piece according to any one of claim 6, characterized in that: The to-be-detected portion of the scanned object is located in a first corner region, and the calibration portion of the calibration component is located in a second corner region corresponding one-to-one to the first corner region.

10. The calibration piece according to any one of claims 1 to 9, characterized in that: The scanning object includes a battery cell or a battery module.

11. A calibration system, characterized in that: The calibration system comprises: Radiation imaging equipment; The calibration piece according to any one of claims 1 to 10; A control unit is connected to the radiation imaging device for acquiring calibration data based on a radiation image obtained by scanning the calibration piece by the radiation imaging device.

12. The calibration system according to claim 11, characterized in that: The calibration system also includes: First Movement Mechanism; a second motion mechanism, arranged at an interval from the first motion mechanism, the first motion mechanism being used to transport the calibration component to the second motion mechanism via the interval area; Wherein, when the calibration portion on the calibration member is located in the spacing area, the radiation imaging device is configured to scan the calibration portion.

13. The calibration system according to claim 12, characterized in that: The calibration data is used to calibrate at least one of the following: The transport speed of the first motion mechanism, the transport speed of the second motion mechanism, and the consistency of the transport speeds of the first motion mechanism and the second motion mechanism.

14. The calibration system according to claim 12 or 13, characterized in that: The radiation imaging device comprises: Radiation source; detector; An annular rotating disk, used for mounting the radiation source and the detector, wherein the annular rotating disk is configured to rotate circumferentially around the spacing area; Wherein, the first motion mechanism is used to move along the axial direction of the annular rotating disk to transport the calibration component to the second motion mechanism through the spacing area.

15. The calibration system according to claim 14, characterized in that: The first motion mechanism and the second motion mechanism are step-by-step transport; The calibration data is used to calibrate at least one of the following: The rotation speed of the annular rotating disk, the consistency between the rotation speed of the annular rotating disk and the stepping interval time of the first motion mechanism, and the consistency between the rotation speed of the annular rotating disk and the stepping interval time of the second motion mechanism.

16. A calibration method, characterized in that: The method comprises: Selecting a calibration piece based on a scanned object of the radiation imaging device to be calibrated, wherein the selected calibration piece has a substantially identical shape to the scanned object of the radiation imaging device to be calibrated, and a size of the calibration piece has a predetermined proportional relationship to a size of the scanned object; The calibration data is obtained using the calibration system described in any one of claims 11 to 15.

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