Calibration member, calibration system and calibration method

Abstract

The present disclosure provides a calibration object having a shape substantially consistent with a scanning object of a radiation imaging device to be calibrated, and a size of the calibration object having a predetermined proportional relationship with a size of the scanning object. The present disclosure also provides a calibration system and a calibration method.

Description

Technical Field

[0001] This disclosure relates to the fields of radiation scanning, radiation imaging equipment calibration, cell or battery module testing, or other fields, and more specifically, to a calibration component, calibration system, and calibration method. Background Technology

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

[0003] In related technologies, for example, cylindrical calibration components are used, with spheres of a different material from the base material inlaid on the outer surface of the cylinder, evenly distributed across the surface. These cylindrical calibration components are used for the calibration of radiation scanning systems, such as for geometric, mechanical, and image calibration of radiation imaging equipment and transportation equipment.

[0004] In the process of realizing the inventive concept disclosed herein, the inventors discovered that existing calibration components 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, affecting the calculation of calibration values ​​and scanning values ​​in actual radiation imaging scenarios. Summary of the Invention

[0005] In view of the above problems, this disclosure provides calibration components, calibration systems and calibration methods.

[0006] According to a first aspect of this disclosure, a calibration element is provided that has a substantially identical shape to the scanning object of the radiation imaging device to be calibrated, and the size of the calibration element is proportional to the size of the scanning object.

[0007] In some embodiments, the calibration element 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 a portion of the rays emitted by the ray source of the radiation imaging device pass sequentially through the first surface, the calibration portion, and the second surface and are received by the detector of the radiation imaging device.

[0008] In some embodiments, the calibration section includes a plurality of grooves, wherein at least two 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 calibration units is substantially the same as the number of parts to be detected located on the scanned object; and / or, the number of calibration units has a predetermined multiple relationship with the number of parts to be detected located on the scanned object.

[0011] In some embodiments, a plurality of calibration units correspond one-to-one with a plurality of detectable units located on the scanning object, wherein the spatial distribution of each calibration unit in the calibration element is substantially consistent with the spatial distribution of the corresponding detectable unit in the scanning object.

[0012] In some embodiments, each calibration part has a substantially identical shape to the corresponding part to be tested, and / or the size of each calibration part has a predetermined proportional relationship with the size of the corresponding part to be tested.

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

[0014] In some embodiments, the part to be detected of the scanned object is located in a first corner region, and the calibration part of the calibration element is located in a second corner region that corresponds one-to-one with the first corner region.

[0015] In some embodiments, the scanned objects include battery cells or battery modules.

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

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

[0018] In some embodiments, 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 and second motion mechanisms.

[0019] In some embodiments, the radiation imaging apparatus includes: a radiation source; a detector; and 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 about a spacer area; wherein a first motion mechanism is configured to move axially along the annular rotating disk to transport a calibration element through the spacer area to a second motion mechanism.

[0020] In some embodiments, the first motion mechanism and the second motion mechanism are used for step-by-step transport; calibration data is used to calibrate at least one of the following: the rotational speed of the annular rotary disk, the consistency between the rotational speed of the annular rotary disk and the step-by-step interval of the first motion mechanism, and the consistency between the rotational speed of the annular rotary disk and the step-by-step interval of the second motion mechanism.

[0021] Another aspect of the present disclosure provides a calibration method, the method comprising: selecting a calibration element based on the scanning object of the radiation imaging device to be calibrated, wherein the selected calibration element has a substantially consistent shape with the scanning object of the radiation imaging device to be calibrated, and the size of the calibration element has a predetermined proportional relationship with the size of the scanning object; and acquiring calibration data using a calibration system as described in any of the above embodiments.

[0022] The above-described one or more embodiments have the following beneficial effects: the calibration component and the scanning object have a specific relationship in shape and size. During calibration, the actual conditions for radiometric imaging of the scanning object can be simulated more accurately, the required calibration data can be obtained more quickly, the amount of data calculation and calculation error can be reduced, the calibration time can be effectively shortened, and the calibration accuracy of at least one of geometric calibration, mechanical calibration and image calibration can be improved, enabling the radiometric imaging device to achieve high-precision radiometric scanning imaging, thereby improving the quality of radiometric imaging. Attached Figure Description

[0023] The foregoing contents, as well as other objects, features, and advantages of this disclosure, will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0024] Figure 1 A schematic diagram of a calibration system according to an embodiment of the present disclosure is shown.

[0025] Figure 2 A schematic diagram of the calibration component according to Embodiment 1 of this disclosure is shown.

[0026] Figure 3 Schematic illustration Figure 2 Three-view drawing and enlarged partial view of the winning bid component.

[0027] Figure 4 This illustration schematically depicts an embodiment according to the present disclosure. Figure 3 The A'-A' section view, the enlarged view of area A, and the enlarged view of area B of the winning bid component.

[0028] Figure 5 This illustration schematically depicts an embodiment according to the present disclosure. Figure 3 The B'-B' section view, the enlarged view of area C, and the enlarged view of area D of the winning bid component.

[0029] Figure 6This illustration schematically depicts an embodiment according to the present disclosure. Figure 3 The C'-C' section view, the enlarged view of area F, and the enlarged view of area G of the winning bid component.

[0030] Figure 7 This illustration schematically depicts an embodiment according to the present disclosure. Figure 3 The D'-D' cross-sectional view, the enlarged view of the H region, and the enlarged view of the I region of the winning bid component.

[0031] Figure 8 The top and front views of the calibration component according to Embodiment 2 of this disclosure are schematically shown.

[0032] Figure 9 Schematic illustration Figure 8 Top view and front view of one of the calibration blocks of the calibration component.

[0033] Figure 10 The diagram schematically shows three views of a calibration component according to Embodiment 3 of this disclosure.

[0034] Figure 11 Schematic illustration Figure 10 The top and front views of one of the calibration blocks in the calibration component.

[0035] Figure 12 A flowchart illustrating a calibration method according to Embodiment 1 of this disclosure is shown schematically.

[0036] Figure 13 A flowchart illustrating the calibration method according to Embodiment 2 of this disclosure is shown schematically.

[0037] Figure 14 A flowchart illustrating the calibration method according to Embodiment 3 of this disclosure is shown schematically.

[0038] The reference numerals used in the above figures are as follows:

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

[0040] Calibration component example 1

[0041] 120. Calibration part; 121. First surface; 122. Second surface; 123. Calibration section; 1231. Groove.

[0042] Calibration component example two

[0043] 220. Calibration component; 221. First surface; 222. Second surface; 223. Calibration part; 224. Substrate; 2241. Second connecting part; 225. Calibration block; 2251. First connecting part.

[0044] Calibration component example three

[0045] 320. Calibration component; 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 clarity, the dimensions of the overall / partial structure or the overall / partial region in the drawings used to describe the embodiments of this disclosure may be enlarged or reduced, i.e., these drawings are not drawn to actual scale. Detailed Implementation

[0047] The embodiments of the present disclosure will now 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 disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0048] Figure 1 A schematic diagram of a calibration system according to an embodiment of the present disclosure is shown. It should be noted that... Figure 1 The examples shown are merely examples to illustrate the application of the embodiments of this disclosure, in order to help those skilled in the art understand the technical content of this disclosure, but do not mean that the embodiments of this 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 component, and a control unit 130. The control unit 130 is communicatively connected to the radiation imaging device 110 and is used to acquire calibration data based on the radiation image obtained by the radiation imaging device 110 scanning the calibration component.

[0050] For example, the radiation imaging device 110 may include a computed tomography (CT) imaging device. After emitting radiation from a radiation source 111 to perform a tomographic scan of the object, the analog signal received by the detector 112 is converted into a digital signal. A computer calculates the attenuation coefficient of each pixel and reconstructs the image, thereby displaying the tomographic structure of various parts of the scanned object. It is understood that the radiation imaging device 110 may also include other devices capable of performing radiation imaging functions.

[0051] The control unit 130 can communicate with the radiation imaging device 110 via a network, which can include various connection types, such as wired, wireless communication links, or fiber optic cables. The control unit 130 can include tablet computers, laptops, and desktop computers. The control unit 130 can also include servers providing various services, such as independent physical servers, server clusters or distributed systems composed of multiple physical servers, or cloud servers providing basic cloud computing services such as cloud services, cloud computing, network services, and middleware services.

[0052] The radiation imaging device 110 can scan a partial or complete area of ​​the calibration component to obtain radiation images, such as CT images.

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

[0054] In some embodiments, the calibration element has a substantially similar shape to the scanned object of the radiation imaging device 110 to be calibrated, and the size of the calibration element is proportional to the size of the scanned object. It is understood that the calibration element includes components or devices for calibrating device performance, and typically contains specific geometric features or material properties. The calibration element in this embodiment is not limited to those used for calibrating devices such as… Figure 1 The calibration system 100 shown can also be used in other radiation scanning scenarios that require calibration.

[0055] For example, the scanned object may include luggage, packages, human bodies, and workpieces. For instance, the scanned object may include a battery cell or battery module. The calibration element may have a substantially similar shape to the battery cell or battery module, and the size of the calibration element may be proportional to the size of the battery cell or battery module.

[0056] "Basically consistent shapes" refers to a similarity between the shapes of the calibration component and the scanned object that exceeds a specific threshold, such as 90% (this is just an example). For instance, by extracting key feature points (such as corner points and edge points) from the outlines of the calibration component and the scanned object, and comparing the positions and distribution of these feature points, if the feature points match, the shapes are basically consistent. Alternatively, by detecting the edges of the calibration component and the scanned object and comparing their contours, if the edge contours match within a certain error range, the shapes are basically consistent. It should be understood that other methods can also be used to determine whether the shapes of the calibration component and the scanned object are basically consistent, and these are 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 their dimensions must be exactly the same. For example, if the outline shape of the calibration part and the scanned object are both cuboid, even if their dimensions are different, they can be considered to have basically the same shape because they are both cuboid.

[0058] When the shape of the calibration element and the scanned object are substantially the same, the calibration element can be scaled up, enlarged, or reduced in length, width, height, and other parameters according to a predetermined ratio, based on the size of the scanned object. "Scaled up" means the size of the calibration element is the same as the size of the scanned object, with a predetermined ratio of 1:1. "Enlarged" means the size of the calibration element is larger than the size of the scanned object, for example, a predetermined ratio of 2:1. "Reduced" means the size of the calibration element is smaller than the size of the scanned object, for example, a predetermined ratio of 1:2.

[0059] According to embodiments of this disclosure, the calibration component and the scanning object have a specific relationship in shape and size. During calibration, the actual conditions for radiometric imaging of the scanning object can be simulated more accurately, and the required calibration data can be obtained more quickly. This reduces the amount of data calculation and calculation errors, effectively shortens the calibration time, and helps to improve the calibration accuracy of at least one of geometric calibration, mechanical calibration and image calibration, enabling the radiometric imaging device 110 to achieve high-precision radiometric scanning imaging, thereby improving the quality of radiometric imaging.

[0060] Calibration component example 1

[0061] Figure 2 A schematic diagram of the calibration component 120 according to Embodiment 1 of this disclosure is shown. Figure 3 Schematic illustration Figure 2 Three-view drawings and enlarged partial views of the winning bid part 120. Among them, Figure 3 (a) shows a top view of the calibration component 120. Figure 3 (b) shows the front view of the calibration element 120. Figure 3 (c) shows a side view of the calibration element 120. Figure 3 (d) shows Figure 3(c) Enlarged view of region E.

[0062] Figure 4 This illustration schematically depicts an embodiment according to the present disclosure. Figure 3 Sectional view A'-A', enlarged view of area A, and enlarged view of area B of the winning bid part 120. Figure 5 This illustration schematically depicts an embodiment according to the present disclosure. Figure 3 Sectional view of the winning bid part 120, including section B'-B', enlarged view of area C, and enlarged view of area D. Figure 6 This illustration schematically depicts an embodiment according to the present disclosure. Figure 3 The C'-C' section view, the enlarged view of area F, and the enlarged view of area G of the winning bid part 120. Figure 7 This illustration schematically depicts an embodiment according to the present disclosure. Figure 3 The D'-D' cross-sectional view, the enlarged view of the H region, and the enlarged view of the I region of the winning bid part 120.

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

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

[0065] For example, the calibration unit 123 provides calibration reference information in the radiation image as a reference for calibration work. During the calibration process, the rays sequentially pass through the first surface 121, the calibration unit 123, and the second surface 122 and are received by the detector 112. The calibration unit 123 can be scanned and imaged by the radiation imaging device 110, and the calibration data can be identified by the control unit 130. 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 be made of a different material than the substrate of the calibration element 120, which includes a first surface 121 and a second surface 122. For instance, if the X-ray source 111 emits X-rays, the different materials of the calibration part 123 and the substrate will result in different responses to the X-rays, leading to different representations in the radiation image and aiding in obtaining accurate calibration data. For example, the substrate may be made of aluminum, while the calibration part 123 may be made of steel, copper, or a non-metallic material (only examples).

[0067] For example, the calibration unit 123 can simulate the structure within the layers of the scanned object, such as simulating at least one of the following: position, shape, size, and material, thereby simulating the actual radiation scanning scenario during the calibration process. The structure of the calibration unit 123 may include grooves, holes, protrusions, or structures with regular shapes.

[0068] According to embodiments of this disclosure, a calibration section 123 is provided 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 section 123 during the calibration process, which can simulate the actual radiation imaging scenario, improve the radiation imaging quality, and achieve a better calibration effect.

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

[0070] For example, when the object being scanned is a battery cell, and the part to be tested is located at one or more corners of the battery cell (i.e., the first corner region), then a calibration part 123 is provided in the second corner region corresponding to the calibration part 120. For example... Figure 2 and Figure 3 The calibration part 120 has a hollow center to reduce the overall weight, and calibration parts 123-1, 123-2, 123-3 and 123-4 are respectively provided in the four second corner areas.

[0071] The part of the battery cell to be tested may include the battery cell electrode and impurities in the battery cell. The calibration unit 123 can simulate the structure of the part to be tested, such as simulating at least one of the positions, shapes, sizes, and materials of the battery cell electrode at the part to be tested, so as to simulate the actual radiation scanning scenario during the calibration process.

[0072] According to embodiments of this disclosure, the part to be detected in the simulated scanning object can provide deterministic information in the calibration data, reducing computational load and computational errors.

[0073] In some embodiments, the calibration section 123 includes one or more grooves 1231, and in the case of multiple grooves 1231, at least two grooves 1231 have different depths.

[0074] like Figures 3-7 As shown, regions A, B, C, D, F, G, H, and I each exhibit multiple grooves 1231 with varying depths. For example, region A contains three grooves with a width of 2mm and different depths, such as 0.9mm, 1.1mm, and 1.3mm (for example only), where the width along the current... Figure 4 The calculation is shown in the left and right directions, with the depth along the current direction. Figure 4 The calculation is shown in the vertical direction. The parameters of groove 1231 in region F are the same as those of groove 1231 in region A. The two regions respectively show two side screenshots of calibration part 123-1, where the width is along the current Figure 6 The calculation is shown in the up and down direction, and the depth is along the current direction. Figure 6 The left and right directions are calculated as shown.

[0075] For example, in the same region, the depth of the groove 1231 is calculated along the direction extending inward toward the calibration member 120, and the width is calculated along the direction perpendicular to the depth. Any two grooves 1231 in different grooves within 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 within the same region can have the same or different shapes. Although Figures 4-7 Each groove 1231 has an open rectangular cross-section, but this is for ease of explanation and understanding, and the present disclosure is not limited thereto. For example, the cross-section of the groove 1231 can be triangular, trapezoidal, etc., and the cross-sectional profile of the groove 1231 can also include curved lines. This helps to provide significant feature information different from other parts of the calibration component 120, thereby enabling accurate calibration based on the calibration data.

[0077] According to embodiments of this disclosure, by radiometrically imaging multiple grooves 1231, parameters such as depth, width, and shape of each groove 1231 can be extracted from the radiometric images. For example, by identifying the depth of each groove 1231 and the depth difference between different grooves 1231, it can be compared with actual measured values ​​for calibration, thereby improving the scanning accuracy in actual radiometric scanning scenarios.

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

[0079] For example, in a CT scan scenario, a radiographic image is obtained through reconstruction algorithms. By identifying the differences between grooves 1231 in different layers and combining this with actual measurements, calibration data can be obtained. For example, Figure 6 The F region shows three layers of grooves 1231 arranged in a stacked manner. By combining the stacking effect of multiple grooves 1231 in the radiometric 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 measured values.

[0080] For example, when the object being scanned is a battery cell, multiple electrodes are stacked at least in the first corner region of the battery cell. Therefore, for each first corner region, the stacked electrodes can be simulated in the second corner region corresponding to the calibration member 120 by setting a groove 1231 for stacking, simulating the parameters of the stacking between the electrodes of the battery cell at the part to be tested, such as the number of layers, the gap between adjacent layers, and the number of electrodes per layer, so that the actual radiation scanning scenario can be simulated during the calibration process.

[0081] According to embodiments of this disclosure, accurate calibration data can be obtained by utilizing the characteristics of X-ray radiation imaging and the information represented in the radiation image by the stacked grooves 1231. Furthermore, by simulating the stacked structure in the part to be scanned of the object, such as the stacked electrodes in a battery cell, deterministic information can be provided in the calibration data, reducing computational load and errors.

[0082] In some embodiments, the number of calibration units 123 is substantially the same as the number of parts to be detected located on the scanned object; and / or, the number of calibration units 123 has a predetermined multiple relationship with the number of parts to be detected located on the scanned object.

[0083] The quantity being basically consistent means that the difference between the number of calibration units 123 and the number of parts to be detected on the scanned object is less than the target value, for example, one. A predetermined multiple relationship is, for example, the number of calibration units 123 being 0.5 times, 1 times, or 2 times the number of parts to be detected on the scanned object, etc., which are just examples.

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

[0085] In some embodiments, a plurality of calibration units 123 correspond one-to-one with a plurality of detectable parts located on the scanned object, wherein the spatial distribution of each calibration unit 123 in the calibration member 120 is substantially consistent with the spatial distribution of the corresponding detectable part in the scanned object.

[0086] Spatial distribution refers to the layout, position, and arrangement of the calibration unit 123 within the calibration component 120, or the layout, position, and arrangement of the parts to be tested within the scanned object. For example, multiple parts to be tested in a battery cell may be distributed diagonally or in the four corner areas, such as... Figures 2-7 As shown, multiple calibration sections 123 can be located in the diagonal or four corner regions of the calibration member 120.

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

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

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

[0090] For example, when the object being scanned is a battery cell, the calibration unit 123 includes multiple calibration plates, each corresponding one-to-one with a plurality of electrodes of the battery cell. That is, each calibration plate has a substantially identical shape to its corresponding electrode, and / or the size of each calibration plate has a predetermined proportional relationship with the size of its corresponding electrode. The material of the calibration plates can be the same as the electrode material, or it can be copper, aluminum, or other materials. The material of the calibration plates can be different from the base material of the calibration component 120.

[0091] According to embodiments of this disclosure, by maintaining at least one of the shape relationship and size relationship between the calibration unit 123 and the unit to be tested, the calibration effect can be enhanced and more accurate calibration can be performed.

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

[0093] For example, when the object being scanned is a battery cell, each of the two diagonals of the battery cell has a part to be detected, and each of the two diagonals of the calibration member 120 has a corresponding calibration part 123, wherein the first distance between the two calibration parts 123 and the second distance between the two parts to be detected have a predetermined proportional relationship.

[0094] According to embodiments of this disclosure, based on a first distance between any two calibration units 123, the distance relationship between corresponding detection units in an actual scanning scenario can be simulated, thereby achieving high-precision calibration based on the spatial distribution, shape, size of each calibration unit 123 and the distance relationship between the calibration units 123.

[0095] Calibration component example two

[0096] Figure 8 The diagram schematically illustrates a top view and a front view of the calibration component 220 according to Embodiment 2 of this disclosure. Figure 8 (a) shows a top view of calibration component 220. Figure 8 (b) shows a front view of the calibration element 220.

[0097] In some embodiments, the calibration element 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 calibration block 225 is predetermined according to the scanning object of the radiation imaging device 110 to be calibrated, such that the calibration element 220 has a substantially consistent shape with the scanning object, and the size of the calibration element 220 has a predetermined proportional relationship with the size of the scanning object.

[0098] For example, various specifications of substrate 224 and calibration block 225 can be provided, including different shapes and sizes. Based on the size and shape of the scanned object, suitable substrate 224 and calibration block 225 can be selected and combined. One or more substrates 224 and one or more calibration blocks 225 can be connected in a detachable manner to form a calibration component 220. Figure 8 The calibration blocks 225-1, 225-2, 225-3, and 225-4 are shown.

[0099] The base 224 is the main body of the calibration component 220, and may include a plate, frame, or other structure. The calibration block 225 provides characteristic information for obtaining calibration data, which can be characterized in the radiographic image. Detachable connections include threaded connections, tenon and mortise connections, pin connections, or snap-fit ​​connections.

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

[0101] According to embodiments of this disclosure, the calibration element 220 has a specific relationship with the scanned object in terms of shape and size. During calibration, the actual conditions for radiometric imaging of the scanned object can be simulated more accurately, and the required calibration data can be obtained more quickly. This reduces the amount of data calculation and calculation errors, effectively shortens the calibration time, and helps to improve the calibration accuracy of at least one of geometric calibration, mechanical calibration and image calibration, enabling the radiometric imaging device 110 to achieve high-precision radiometric scanning imaging, thereby improving the quality of radiometric imaging.

[0102] Furthermore, the calibration component 220 is formed by detachably connecting the substrate 224 and at least one calibration block 225, reducing manufacturing costs. By replacing either the substrate 224 or the calibration block 225, the resulting calibration component can meet the calibration requirements of scanning objects of different specifications. Damaged components can also be replaced selectively, rather than the entire calibration component 220 being scrapped, thus saving costs.

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

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

[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 projected areas may be substantially equal.

[0106] For example, the calibration part 223 may be made of the same or different material as the substrate 224 of the calibration element 220. For example, if the X-ray source 111 emits X-rays, since the material of the calibration part 223 is different from that of the substrate 224, their responses to X-rays will also be different, resulting in different characteristics in the radiation image, which helps to obtain accurate calibration data. For example, the substrate 224 may be made of aluminum, and the calibration block 225 may be made of steel, copper, or a non-metallic material, etc. (for example only).

[0107] For example, calibration unit 223 is used to characterize and provide calibration reference information in the radiation image as a reference for calibration work. During the calibration process, the rays pass sequentially through the first surface 221, calibration unit 223, and second surface 222 and are received by detector 112. Calibration unit 223, as a feature part, can be scanned and imaged by radiation imaging device 110 and identified by 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 radiation imaging device 110.

[0108] For example, the calibration unit 223 can simulate the structure within the layers of the scanned object, such as simulating at least one of the following: position, shape, size, and material, thereby simulating the actual radiation scanning scenario during the calibration process. The structure of the calibration unit 223 may include grooves, holes, protrusions, or structures with regular shapes.

[0109] According to embodiments of this disclosure, a calibration section 223 is provided 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 scenario during the calibration process, improve the radiation imaging quality, and achieve a better calibration effect.

[0110] In some embodiments, the orthographic projection of the calibration unit 223 does not overlap with the orthographic projection of the substrate 224. This means that after the rays pass sequentially through the first surface 221, the calibration unit 223, and the second surface 222, they can be received by the detector 112 without passing through the substrate 224. This allows for the acquisition of an accurate image of the calibration unit 223 in the radiation image, which helps to eliminate interference from the substrate 224 and improves the accuracy of the calibration data. Furthermore, during scanning, only the calibration unit 223 can be placed within the scanning area of ​​the radiation imaging device 110, while the substrate 224 is placed outside the scanning area, simulating the actual scanning scenario of the battery cell, or reducing the workload of the radiation imaging device 110 and the computing resources of the control unit 130.

[0111] Figure 9 Schematic illustration Figure 8 The front and top views of calibration block 225, one of the calibration components 220. Specifically, Figure 9 (a) Top view including calibration block 225-4, Figure 9 (b) Front view including 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 separate, independent regions, thereby excluding related mechanical components in the first connection portion from the radiographic image. Figure 9 The different regions separated by dashed lines in (a) are for illustrative purposes only, and their positions do not constitute a limitation of this 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 a first connection portion 2251 of the corresponding calibration block 225.

[0114] In some embodiments, each second connection portion 2241 includes a recess, 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 substantially placed in the recess and is detachably connected to the recess.

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

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

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

[0118] For example, when the object being scanned is a battery cell, and the part to be tested is located at one or more corners of the battery cell (i.e., the first corner region), a calibration block 225 is provided in the second corner region corresponding to the calibration member 220, and the calibration block 225 refers to the calibration part 223 corresponding to the part to be tested. Figure 8 The calibration component 220 has a hollowed-out center to reduce the overall weight. Calibration blocks 225-1, 225-2, 225-3 and 225-4 are respectively set in the four second corner areas. Each calibration block 225 is provided with a calibration part 223.

[0119] The part of the battery cell to be tested may include the battery cell electrode and impurities in the battery cell. The calibration unit 223 can simulate the structure of the part to be tested, such as simulating at least one of the positions, shapes, sizes, and materials of the battery cell electrode at the part to be tested, so as to simulate the actual radiation scanning scenario during the calibration process.

[0120] According to embodiments of this disclosure, the part to be detected in the simulated scanning object can provide deterministic information in the calibration data, reducing computational load and computational errors.

[0121] In some embodiments, the calibration section 223 includes one or more grooves, and in the case of multiple grooves, at least two grooves have different depths.

[0122] In some embodiments, multiple grooves are stacked along the path of the ray. That is, the ray passes through multiple grooves sequentially.

[0123] The embodiments and effects of the grooves in the calibration part 223 can be referred 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 first embodiment of the calibration part 220 is introduced into the second embodiment of the calibration part 220.

[0124] In some embodiments, the number of calibration blocks 225 is substantially the same as the number of parts to be detected on the scanned object; and / or, the number of calibration blocks 225 has a predetermined multiple relationship with the number of parts to be detected on the scanned object.

[0125] The quantity being basically consistent means that the difference between the number of calibration blocks 225 and the number of parts to be detected on the scanned object is less than a target value, for example, the target value is 1. A predetermined multiple relationship is, for example, the number of calibration blocks 225 being 0.5 times, 1 times, or 2 times the number of parts to be detected on the scanned object, etc., which are just examples. For example, each calibration block 225 can be used to set one calibration part 223.

[0126] According to embodiments of this disclosure, by simulating the number of detectable parts of a scanned object in an actual scanning scenario, accurate reference data in the quantity dimension can be provided, which is beneficial for calibration. For example, when the number of calibration blocks 225 and the number of detectable parts are substantially the same or have a predetermined multiple relationship, the number of calibration parts 223 contained in the radiometric image during the calibration process can be more consistent with the number of detectable parts contained in the radiometric image in the actual scanning scenario, thereby achieving better calibration results.

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

[0128] Spatial distribution refers to the layout, position, and arrangement of calibration blocks 225 within calibration component 220, or the layout, position, and arrangement of the parts to be tested within the scanned object. For example, multiple parts to be tested in a battery cell may be distributed diagonally or in the four corner areas, such as... Figure 8 As shown, multiple calibration blocks 225 can be located in the diagonal or four corner areas of the calibration component 220.

[0129] According to embodiments of this disclosure, by simulating the spatial distribution of the part to be detected of the scanned object in an actual scanning scenario, 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 consistent shape with the corresponding part to be tested, and / or the size of the calibration portion 223 of each calibration block 225 has a predetermined proportional relationship with the size of the corresponding part to be tested.

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

[0132] For example, when the object being scanned is a battery cell, the calibration unit 223 includes multiple calibration plates, each corresponding one-to-one with a plurality of electrodes of the battery cell. That is, each calibration plate has a substantially identical shape to its corresponding electrode, and / or the size of each calibration plate has a predetermined proportional relationship with the size of its corresponding electrode. The material of the calibration plates can be the same as the electrode material, or it can be copper, aluminum, or other materials. The material of the calibration plates can be different from the material of the substrate 224 of the calibration element 220.

[0133] According to embodiments of this disclosure, by maintaining at least one of the shape relationship and dimensional relationship between the calibration unit 223 and the part to be tested, not only can the measurement accuracy be improved and the accuracy of the measurement results be ensured, but the calibration effect can also be enhanced and the calibration can be performed more accurately.

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

[0135] For example, when the object being scanned is a battery cell, each of the two diagonals of the battery cell has a part to be detected, and each of the two diagonals of the calibration member 220 has a corresponding calibration part 223, wherein the first distance between the two calibration parts 223 and the second distance between the two parts to be detected have a predetermined proportional relationship.

[0136] According to embodiments of this disclosure, based on a first distance between any two calibration units 223, the distance relationship between corresponding detection units in an actual scanning scenario can be simulated, thereby achieving high-precision calibration based on the spatial distribution, shape, size of each calibration unit 223 and the distance relationship between the calibration units 223.

[0137] Calibration component example three

[0138] Figure 10 The diagram schematically illustrates three views of the calibration component 320 according to Embodiment 3 of this disclosure. Figure 10 (a) shows a top view of calibration component 320. Figure 10 (b) shows the front view and partial sectional view of calibration component 320. Figure 10 (c) shows a side view and a partial sectional view of the calibration component 320.

[0139] In some embodiments, the calibration element 320 includes a base 324, at least one of which has a variable shape and size; 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, such that the calibration element 320 has a substantially consistent shape with the scanning object, and the size of the calibration element 320 has a predetermined proportional relationship with the size of the scanning object.

[0140] The substrate 324 is the main body of the calibration element 320. At least one of the shape and size of the substrate 324 is variable, including: the substrate 324 includes a variable state capable of adjusting at least one of the shape and size; the substrate 324 also includes a holding state capable of maintaining its shape and size after contact with the variable state. This allows the calibration element 320 to have a specific relationship between its shape and size and the scanned object. The calibration block 325 is used to provide feature information for obtaining calibration data, which can be characterized in the radiographic image.

[0141] For example, the substrate 324 can be made of metallic materials (such as copper, steel, etc.) to ensure its stability and durability. The design of the substrate 324 may include multiple mounting slots or interfaces to accommodate calibration blocks 325 of different shapes and sizes. The calibration blocks 325 can be made of materials similar to the scanned object to improve their 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 multiple retractable mechanisms. Each retractable mechanism may adjust its length via a built-in mechanical or electric telescopic mechanism, thereby changing the overall size of the base 324.

[0143] For example, refer to Figure 10 The base 324 includes a first telescopic mechanism 326. The first telescopic mechanism 326 is configured to extend along a first direction (e.g., Figure 10 (in the left and right directions) extend or contract; 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 Figure 10 The base 324 also includes a second telescopic mechanism 327. The second telescopic mechanism 327 is configured to extend along a second direction (e.g., Figure 10 The first direction (up and down) extends or contracts, and the second direction intersects with the second direction; wherein, the second telescopic mechanism 327 is connected to M calibration blocks 325, where M is an integer greater than or equal to 1.

[0145] The first telescopic mechanism 326 includes two opposing telescopic mechanisms. Figure 10 (a) The telescopic sections are arranged vertically, and the second telescopic mechanism 327 includes two opposing telescopic sections. Figure 10 (a) The telescopic sections arranged left and right are connected by a second connecting part 3241 between the telescopic section of the first telescopic mechanism 326 and the telescopic section of the second telescopic mechanism 327, forming a structure as shown in the figure. Figure 10 The rectangular telescopic frame structure shown.

[0146] Each telescopic section can be a tubular structure made of steel, aluminum, or other high-strength materials, and can extend or retract via a built-in mechanical or electric mechanism. For example, a threaded rotation mechanism can be used to adjust the length of the telescopic section; alternatively, a set screw can be used to control the extension and retraction. Figure 10 As shown, each telescopic section includes a connecting part and telescopic parts on both sides of the connecting part. The telescopic parts extend into the sleeve-shaped connecting part, and set screws pass through the connecting part to fix the telescopic parts. The extension and retraction of the telescopic parts are manually controlled by tightening and loosening the set screws. Each second connecting part 3241 is located on the connecting block 328. The connecting block 328 is connected to the telescopic part by means of screws, straight-head positioning threads, adhesive, integral construction, welding, etc.

[0147] For example, the substrate 324 may also include a folding structure, which may be composed of multiple plates or sheets connected by hinges, which may be added, reduced or replaced, and folded or unfolded to accommodate different size and shape requirements.

[0148] For example, the substrate 324 may also include an inflatable structure comprising an outer skin made of a ductile material (such as rubber or plastic) that changes size and shape by inflating and deflating.

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

[0150] According to embodiments of this disclosure, the calibration element 320 has a specific relationship with the scanned object in terms of shape and size. During calibration, the actual conditions for radiometric imaging of the scanned object can be simulated more accurately, and the required calibration data can be obtained more quickly. This reduces the amount of data calculation and calculation errors, effectively shortens the calibration time, and helps to improve the calibration accuracy of at least one of geometric calibration, mechanical calibration and image calibration, enabling the radiometric imaging device 110 to achieve high-precision radiometric scanning imaging, thereby improving the quality of radiometric imaging.

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

[0152] In some embodiments, refer to Figure 10 The calibration block 325 includes a calibration section 323, a first surface 321, and a second surface 322. The second surface 322 is opposite to the first surface 321; the calibration section 323 is located between the first surface 321 and the second surface 322; wherein at least a portion of the rays emitted by the radiation source 111 passes sequentially through the first surface 321, the calibration section 323, and the second surface 322 and is received by the detector 112. Refer to the calibration block 225, calibration section 223, first surface 221, and second surface 222 in Embodiment 2 of the calibration component, 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. Refer to the orthographic projection of the calibration part 223 and the base 224 in Embodiment 2 of the calibration component for the corresponding structural relationships, examples, and technical effects.

[0154] Figure 11 Schematic illustration Figure 10 The front and top views of calibration block 325, one of the calibration components 320. Specifically, Figure 11 (a) Top view including calibration block 325-4, Figure 10 (b) Front view including calibration block 325-4.

[0155] In some embodiments, the calibration block 325 includes a first connecting portion 3251. The first connecting portion 3251 is detachably connected to the base 324; wherein the first connecting portion 3251 and the calibration portion 323 are located in separate, independent regions. Figure 11 The different regions separated by dashed lines in (a) are for illustrative purposes only and their positions do not constitute a limitation of this disclosure. The relationship between the first connecting part 2251, the calibration part 223, and the base 224 in Embodiment 2 of the calibration component, as well as the corresponding structural relationships, examples, and technical effects, can be referred to.

[0156] In some embodiments, the base 324 includes at least one second connecting portion 3241, corresponding one-to-one with at least one calibration block 325; wherein the connection between each calibration block 325 and the base 324 includes: the first connecting portion 3251 of each calibration block 325 being integrally formed with the corresponding second connecting portion 3241; or, the first connecting portion 3251 of each calibration block 325 being detachably connected with the corresponding second connecting portion 3241. The relationship between the first connecting portion 2251, the second connecting portion 2241, the calibration block 225, and the base 224 in the second embodiment of the calibration component, as well as the corresponding structural relationships, examples, and technical effects, can be referred to.

[0157] In some embodiments, each second connecting portion 3241 includes a recess, and the detachable connection between each second connecting portion 3241 and the first connecting portion 3251 of the corresponding calibration block 325 includes: the first connecting portion 3251 of the corresponding calibration block 325 is substantially placed within the recess and is detachably connected to the recess. The relationship between the first connecting portion 2251, the second connecting portion 2241, and the recess in the second embodiment of the calibration component, as well as the corresponding structural relationships, examples, and technical effects, can be referred to.

[0158] In some embodiments, the part to be detected of the scanned object includes a first corner region, and the calibration part 323 of the calibration block 325 is located in the second corner region of the calibration member 320, which corresponds one-to-one with the first corner region. The relationship between the first corner region and the second corner region, as well as the corresponding structural relationships, examples, and technical effects, can be explained with reference to the second embodiment of the calibration member.

[0159] In some embodiments, the calibration section 323 includes one or more grooves, and in the case of multiple grooves, at least two grooves have different depths.

[0160] In some embodiments, multiple grooves are stacked along the path of the ray. That is, the ray passes through multiple grooves sequentially.

[0161] The embodiments and effects of the grooves in the calibration part 323 can be referred 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 one is introduced into the calibration part embodiment three.

[0162] In some embodiments, the number of calibration blocks 325 is substantially the same as the number of parts to be detected on the scanned object; and / or, the number of calibration blocks 325 has a predetermined multiple relationship with the number of parts to be detected on the scanned object. The description of the number of calibration blocks 225 corresponding to the number of parts to be detected on the scanned object in Calibration Embodiment 2, as well as the description of the technical effects, can be introduced into Calibration Embodiment 3.

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

[0164] In some embodiments, the calibration portion 323 of each calibration block 325 has a substantially identical shape to the corresponding part to be tested, and / or, the size of the calibration portion 323 of each calibration block 325 has a predetermined proportional relationship with the size of the corresponding part to be tested. The description of the shape and size relationship between the calibration portion 223 and the corresponding part to be tested in Embodiment 2 of the calibration component, such as illustrative examples and descriptions of technical effects, can be introduced into Embodiment 3 of the calibration component.

[0165] In some embodiments, the calibration portions 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 corresponding test portions of the calibration portions 323 of the two calibration blocks 325. The description of the shape and size relationship between the calibration portion 223 and the corresponding test portion in Calibration Embodiment 2, such as examples and descriptions of technical effects, can be introduced into Calibration Embodiment 3.

[0166] It should be noted that the features in the calibration component embodiments one, two, and three of this 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 general in different embodiments.

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

[0168] In conjunction with calibration components 120, 220, and 320 in Embodiments 1, 2, and 3, in some embodiments, the battery cell includes a positive electrode and a negative electrode. When detecting the corner of the battery cell (i.e., the part to be detected), multiple battery cells can be placed. For any two adjacent battery cells, one corner of one battery cell is adjacent to and spaced apart from one corner of another battery cell. In each detection, 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 detected simultaneously. Accordingly, multiple calibration components (such as at least one of calibration component 120, calibration component 220, and calibration component 320) can be placed. For any two adjacent calibration components, one corner of one calibration component is adjacent to and spaced apart from one corner of another calibration component. The calibrator includes a calibration section for the corner of the calibrator being irradiated. In a single calibration, the corners where the calibration sections of one calibrator and another calibrator are located are simultaneously detected. In some embodiments, any two adjacent calibrators may have the same or different dimensions. At different times, multiple sizes of scanning objects can be calibrated simultaneously in a single calibration, improving calibration efficiency.

[0169] Referring to calibration components 120, 220, and 320 in Embodiments 1, 2, and 3 of Calibration Components, the following further describes the use of calibration data for at least one of geometric calibration, mechanical calibration, and image calibration. The calibration components described below include at least one of calibration components 120, 220, and 320.

[0170] In some embodiments, refer to 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 component to the second motion mechanism 150 via the spaced area between them; wherein, when the calibration part on the calibration component is located in the spaced area, the radiation imaging device 110 is configured as a scanning calibration part.

[0171] Reference Figure 8 or Figure 9 When any calibration block on the calibration element is located in the interval region, the radiation imaging device 110 is configured to scan the calibration portion on that calibration block.

[0172] The first motion mechanism 140 and the second motion mechanism 150 can each be a linear motion mechanism, for example, the transport of the calibration component is achieved by the movement of a conveyor belt.

[0173] In some embodiments, mechanical calibration is performed 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 section is located in the interval region, the radiation imaging device 110 can perform a radiation scan on the calibration section to avoid the presence of other noises besides the calibration section in the radiation image.

[0175] For example, the first motion mechanism 140 transports at least one calibration element it carries. When the calibration portion of each calibration element is located at the center of the scanning area of ​​the radiation imaging device 110, the radiation imaging device 110 sends rays to scan the calibration portion, for example, to scan multiple grooves in the calibration portion. Then, the first motion mechanism 140 transports each calibration element to the second motion mechanism 150, which transports each calibration element to a designated position. The first motion mechanism 140 and the second motion mechanism 150 maintain the same transport speed to ensure smooth transfer of each calibration element between the motion mechanisms.

[0176] The calibration component has a shape that is substantially the same as the scanned object of the radiation imaging device 110 to be calibrated, and the size of the calibration component has a predetermined proportional relationship with the size of the scanned object. The structure, position, shape, and size of the calibration part of the calibration component can simulate the part to be detected of the scanned object. Therefore, by collecting the actual transport speed of the first motion mechanism 140 and the second motion mechanism 150, and combining 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 it is 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 this disclosure, multi-dimensional information with a deterministic relationship to the actual scanning scenario can be provided by simulating the actual scanning scenario. This is beneficial for calibrating the parameters of mechanical equipment such as the first motion mechanism 140 and the second motion mechanism 150 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, the annular rotating disk 113 being used to mount the radiation source 111 and the detector 112, wherein the annular rotating disk 113 is configured to rotate circumferentially about a spacer region; wherein a first motion mechanism 140 is used to move axially along the annular rotating disk 113 to transport a calibration element through the spacer region to a second motion mechanism 150.

[0179] Reference Figure 1 The radiation imaging device 110 also includes a support mechanism 114 for supporting an annular rotating disk 113. The annular rotating disk 113 is circumferentially rotatable relative to the support mechanism 114. The annular rotating disk 113 is annular in shape and includes a detection channel inside. The annular rotating disk 113 is configured to rotate circumferentially around the detection channel. The interval region is located within the detection channel of the annular rotating disk 113.

[0180] First, at least one calibration element is placed on a first motion mechanism 140, which moves axially along an annular rotating disk 113 to transport the calibration portion of the at least one calibration element to a spacing region. When multiple calibration elements are placed, the calibration portions of any two adjacent calibration elements can be simultaneously placed in the spacing region, for example, at the corner regions of adjacent calibration elements. Then, the annular rotating disk 113 rotates. During rotation, a radiation source 111 emits a radiation beam to perform a tomographic scan on one or more calibration elements. A detector 112 receives the radiation beam and converts it into an electrical signal, thereby obtaining a radiation image.

[0181] For example, the X-ray source 111 can be a single-focus type or a distributed multi-focus type. When the X-ray source 111 is a distributed multi-focus type, different calibration sections or different grooves within the same calibration section can be scanned simultaneously using different focal points. This allows for simultaneous detection of different positions on multiple calibration components, different positions on the same calibration component, or different positions on the same calibration section.

[0182] For example, using Figure 8 When calibrating the calibration components shown, different shapes or sizes of substrates and calibration blocks can be used to provide calibration components of different specifications. The radiation imaging device 110 can obtain radiation images of calibration components of different specifications, providing more comprehensive data for calibration. For example, using... Figure 10During calibration, at least one of the shape and size of the substrate can be adjusted multiple times to provide calibration components of different specifications. The radiation imaging device 110 can obtain radiation images of calibration components of different specifications, providing more comprehensive data for calibration. When providing calibration components of different specifications, a single calibration component may include multiple identical or different calibration blocks. Different calibration components may include multiple identical or different calibration blocks, and the radiation imaging device 110 acquires more comprehensive data through scanning.

[0183] In some embodiments, the first motion mechanism 140 and the second motion mechanism 150 are used for step-by-step transport; calibration data is used to calibrate at least one of the following: the rotational speed of the annular rotary disk 113, the consistency between the rotational speed of the annular rotary disk 113 and the step-by-step interval of the first motion mechanism 140, and the consistency between the rotational speed of the annular rotary disk 113 and the step-by-step interval of the second motion mechanism 150.

[0184] Stepping transport includes transport methods achieved through stepper motors or other intermittent motion mechanisms. The stepping interval time includes the time interval between two consecutive stepping movements.

[0185] For example, when the first motion mechanism 140 transports the calibration portion of at least one calibration element to the interval area, an interval period is then observed. Then, the annular rotary disk 113 rotates, rotating by a predetermined angle (e.g., 90 degrees, 180 degrees, or 360 degrees) during the interval period to complete the scanning of the calibration portion within the interval area. Then, the first motion mechanism 140 ends the interval period and, through one or more step movements, transmits each calibration element to the second motion mechanism 150 for continued transport, thereby cyclically achieving continuous scanning of multiple calibration elements.

[0186] It is evident that the rotational 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, during the stepping interval, the annular rotating disk 113 rotates a specific number of times at a set rotational speed, such as one or more times, and can obtain a radiographic image that meets the quality requirements.

[0187] For example, during the calibration process, the calibration data is obtained by collecting the actual rotation speed of the annular rotating disk 113, the stroke of each step movement of the first motion mechanism 140 or the second motion mechanism 150, the step interval time of the first motion mechanism 140 or the second motion mechanism 150, and the quality and image parameters of the radiation image. The calibration data is then 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 image features of the calibration section (e.g., features of multiple grooves at different depths).

[0188] For example, the stepping control algorithm is calibrated using calibration data, such as calibrating the frequency and number of control stepping motion pulse signals. Furthermore, the rotational speed and stepping interval of the annular rotating disk 113 are calibrated using the calibration data.

[0189] According to embodiments of this disclosure, the provided calibration component has a specific relationship with the shape and size of the scanned object. Calibration can improve the synchronization between the first motion mechanism 140, the second motion mechanism 150, and the radiation scanning device, avoiding asynchrony during actual radiation scanning. Furthermore, it can improve radiation scanning accuracy and reduce error accumulation in actual scanning scenarios.

[0190] In some embodiments, the radiation imaging device 110 can also be geometrically calibrated. For example, based on the initial parameters of the radiation source 111, the initial parameters of the detector 112, and the positional relationship between the calibration part of the calibration component and 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; based on the actual projection position and the theoretical projection position measured during the calibration process, the parameters of the radiation source 111 and the detector 112 are calibrated to obtain optimized parameters of the radiation source 111 and the detector 112; the optimized parameters of the radiation source 111 and the optimized parameters of the detector 112 are determined as the geometric calibration parameters.

[0191] For example, the calibration component has multiple calibration sections, each located at a different position within the detection channel of the radiation scanning device. Each calibration section has a different positional relationship with the radiation source 111 and detector 112, which facilitates the acquisition of calibration data from multiple different geometric positions. Furthermore, each calibration section includes multiple grooves, with at least two grooves having different depths, and these grooves are stacked. Therefore, the different positional relationships between each groove of each calibration section and the radiation source 111 and detector 112, combined with the differences in groove depth, improve calibration accuracy and enable 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 scanned area (such as the interval area described above) to obtain actual projection data for 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 theoretical physical property values ​​and physical property measurement values ​​corresponding to each calibration part. The theoretical physical property values ​​and physical property measurement values ​​corresponding to each calibration part include: the theoretical physical property value and physical property measurement value corresponding to each groove.

[0193] For example, by providing calibration elements that have a specific relationship with the shape and size of the scanned object, wherein at least one of the calibration elements' number, spatial distribution, shape, or structure is also characteristically related to the part of the scanned object to be detected, the required calibration data can be read during actual image reconstruction, which helps to improve the accuracy of image reconstruction.

[0194] Based on the calibration components and calibration system 100 described above, this disclosure also provides calibration methods according to several embodiments.

[0195] Calibration Method Example 1

[0196] Figure 12 A flowchart illustrating a calibration method according to Embodiment 1 of this disclosure is shown schematically.

[0197] In operation S1210, a calibration element is selected based on the scanning object of the radiation imaging device to be calibrated. The selected calibration element has a shape that is substantially the same as the scanning object of the radiation imaging device to be calibrated, and the size of the calibration element has a predetermined proportional relationship with the size of the scanning object. The calibration element in this embodiment can be the calibration element described in the first embodiment of the calibration element above.

[0198] For example, the scanning target of the radiation imaging device is determined for different specifications and types of objects to be inspected. Then, a calibration piece with a specific relationship to the shape and size of the object to be scanned is selected. This specific relationship includes that the shapes are substantially consistent and the sizes are in a predetermined proportion.

[0199] In operation S1220, calibration data is acquired using a calibration system. For example, the calibration system provided in one or more embodiments of this disclosure.

[0200] In some embodiments, acquiring calibration data using a calibration system includes: placing a calibration component in a first motion mechanism; transporting the calibration portion of the calibration component to the scanning area of ​​a radiation scanning device via the first motion mechanism; the radiation scanning device sending a beam of light to scan the calibration portion, which is received by a detector to obtain a radiation image; and obtaining calibration data based on the radiation image using a control unit, followed by at least one of geometric calibration, mechanical calibration, and image calibration.

[0201] According to embodiments of this disclosure, the calibration component and the scanning object have a specific relationship in shape and size. During calibration, the actual conditions for radiometric imaging of the scanning object can be simulated more accurately, and the required calibration data can be obtained more quickly. This reduces the amount of data calculation and calculation errors, effectively shortens the calibration time, and helps to improve the calibration accuracy of at least one of geometric calibration, mechanical calibration and image calibration, enabling the radiometric imaging device to achieve high-precision radiometric scanning imaging, thereby improving the quality of radiometric imaging.

[0202] Calibration Method Example 2

[0203] Figure 13 A flowchart illustrating the calibration method according to Embodiment 2 of this disclosure is shown schematically.

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

[0205] In operation S1320, at least one calibration block is detachably connected to the substrate to obtain a calibration element, wherein the calibration element has a substantially consistent shape with the scanned object, and the size of the calibration element has a predetermined proportional relationship with the size of the scanned object; the calibration element in this embodiment can be the calibration element described in the calibration element embodiment two above.

[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 element. The calibration element has a shape substantially consistent with the scanned object and its size has a predetermined proportional relationship. When the calibration element includes multiple calibration blocks, the shapes and sizes of any two calibration blocks can be the same or different.

[0207] In operation S1330, calibration data is acquired using a calibration system. For example, the calibration system of one or more embodiments provided in this disclosure.

[0208] Calibration Method Example 3

[0209] Figure 14 A flowchart illustrating the calibration method according to Embodiment 3 of this disclosure is shown schematically.

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

[0211] In operation S1420, at least one calibration block is connected to the substrate to obtain a calibration element, wherein the calibration element has a shape that is substantially the same as the scanned object, and the size of the calibration element has a predetermined proportional relationship with the size of the scanned object; the calibration element in this embodiment can be the calibration element described in the calibration element embodiment three above.

[0212] In operation S1430, calibration data is acquired using a calibration system. For example, the calibration system of one or more embodiments provided in this disclosure.

[0213] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0214] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0215] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A target, characterized in that, The calibration member has a shape substantially consistent with a scanning object of a radiation imaging device to be calibrated, and a size of the calibration member has a predetermined proportional relationship with a size of the scanning object; The calibration member comprises: a first surface; a second surface opposite to the first surface; a calibration portion between the first surface and the second surface, the calibration portion comprising a plurality of grooves, wherein depths of at least two grooves are different, and the plurality of grooves are arranged in a layering manner along a path of a ray, and the depth of the groove is calculated along a direction extending towards an interior of the calibration member; wherein at least part of the ray emitted by a ray source of the radiation imaging device passes through the first surface, the plurality of grooves and the second surface in sequence to be received by a detector of the radiation imaging device to obtain a radiation image, and the radiation image is used to extract the depth of each groove.

2. The calibration member of claim 1, wherein: a number of the calibration portions is substantially consistent with a number of to-be-detected portions of the scanning object; and / or the number of the calibration portions has a predetermined multiple relationship with the number of the to-be-detected portions of the scanning object.

3. The gauge of claim 2, wherein, a plurality of the calibration portions correspond to a plurality of the to-be-detected portions of the scanning object one by one, wherein: a spatial distribution of each of the calibration portions in the calibration member is substantially consistent with a spatial distribution of a corresponding to-be-detected portion in the scanning object.

4. The calibration member of claim 3, wherein: each of the calibration portions has a shape substantially consistent with a corresponding to-be-detected portion, and / or a size of each of the calibration portions has the predetermined proportional relationship with a size of the corresponding to-be-detected portion.

5. The calibration member of claim 3, wherein: a first distance between any two of the calibration portions has the predetermined proportional relationship with a second distance between two to-be-detected portions corresponding to the two calibration portions.

6. The gauge of any one of claim 3, wherein, The to-be-detected portion of the scanning object is located in a first corner region, and the calibration portion of the calibration member is located in a second corner region corresponding to the first corner region one by one.

7. The gauge of any one of claims 1-6, wherein, The scanning object comprises an electric core or a battery module.

8. A calibration system characterized by, The calibration system comprises: a radiation imaging device; the calibration member of any one of claims 1-7; a control unit in communication connection with the radiation imaging device, configured to acquire calibration data based on a radiation image obtained by the radiation imaging device scanning the calibration member.

9. The calibration system of claim 8, wherein, The calibration system further comprises: a first motion mechanism; a second motion mechanism arranged in a spaced manner with the first motion mechanism, the first motion mechanism being configured to transport the calibration member to the second motion mechanism via a spacing region; wherein when a calibration portion on the calibration member is located in the spacing region, the radiation imaging device is configured to scan the calibration portion.

10. The calibration system of claim 9, wherein, The calibration data is used to calibrate at least one of: a transport speed of the first motion mechanism, a transport speed of the second motion mechanism, and a transport speed consistency of the first motion mechanism and the second motion mechanism.

11. The calibration system of claim 9 or 10, wherein, The radiation imaging device comprises: a ray source; a detector; a ring-shaped rotating disc configured to install the ray source and the detector, wherein the ring-shaped rotating disc is configured to rotate circumferentially around the spacing region; The first movement mechanism is used for moving along the axial direction of the annular rotary disc to transport the calibration piece to the second movement mechanism through the interval area.

12. The calibration system of claim 11, wherein, The first movement mechanism and the second movement mechanism are stepwise transported. The calibration data are used for calibrating at least one of the following: The rotation speed of the annular rotary disc, the consistency of the rotation speed of the annular rotary disc and the stepwise intermittent time of the first movement mechanism, and the consistency of the rotation speed of the annular rotary disc and the stepwise intermittent time of the second movement mechanism.

13. A calibration method characterized by, The method comprises: Selecting a calibration piece based on a scanning object of the radiation imaging device to be calibrated, wherein the selected calibration piece has a shape substantially consistent with the scanning object of the radiation imaging device to be calibrated, and the size of the calibration piece has a predetermined proportional relationship with the size of the scanning object; Obtaining calibration data by using the calibration system according to any one of claims 8-12.

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