Radiation imaging test system and radiation imaging method

Abstract

The invention provides a radiation imaging test system and method. The test system comprises an adjusting plate assembly, an imaging device, a detection device, a base and a placing plate which is arranged on the base and used for placing radiation imaging equipment. A laser positioning mark is arranged on the placing plate and receives laser output by the laser device; the adjusting plate assembly is fixed on the base through a bracket and comprises two or more adjusting plates and radioactive sources fixed on the adjusting plates through hoops; the imaging device is arranged on the placing plate and is used for imaging the adjusting plate assembly; the detection device measures the first distance between the laser positioning mark and the laser, and provides data support for calibration of the relative distance between the radioactive source and the imaging device. The distance between the imaging device and the radioactive source on the test bed can be adjusted, and clearer and more accurate images can be obtained under the condition that the intensity of the radioactive source is high or the imaging environment is complex.

Description

Technical Field

[0001] This invention relates to the field of test bench technology, and more particularly to a test system for radiation imaging. Background Technology

[0002] The radiation imaging test system provides a stable support and fixed platform for the radiation imaging equipment, maintaining equipment stability during testing to ensure that image quality is not affected by external interference. Many key technology researches require system calibration and testing under experimental conditions, but traditional radiation imaging test systems are often fixed application systems with limited adjustable range of geometric parameters, making it difficult to support systematic testing.

[0003] Patent CN112666188A discloses a radiation scanning inspection device, including: a radiation inspection apparatus comprising a rigid portal frame, the portal frame including a transverse portion and a first longitudinal portion and a second longitudinal portion respectively connected to the left and right ends of the transverse portion; a walking device including multiple wheel assemblies, the multiple wheel assemblies being respectively disposed at the bottom of the first longitudinal portion and the bottom of the second longitudinal portion; and a correction device for keeping the walking device moving in a straight line. A straight-line walking detection device is also disclosed, including a laser sensor signal-connected to a control device. However, the distance between the radiation imaging device and the radiation source on the test bench of this patent is not adjustable, and it is impossible to obtain clearer and more accurate images under conditions of high radiation source intensity or complex imaging environments. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the first aspect of the present invention provides a radiation imaging test system, comprising: a base and a placement plate disposed on the base for placing a radiation imaging device, the placement plate being provided with a laser positioning mark that receives laser light output from a laser; an adjustment plate assembly fixed to the base by a bracket, the adjustment plate assembly including two or more adjustment plates and a radiation source fixed on the adjustment plates by clamps; an imaging device disposed on the placement plate for imaging the adjustment plate assembly; and a detection device measuring a first distance between the laser positioning mark and the laser, providing data support for calibrating the relative distance between the radiation source and the imaging device.

[0006] Furthermore, the test system also includes a sliding drive mechanism, which drives the clamp to slide on the adjustment plate.

[0007] Furthermore, the test system also includes a rotation mechanism for rotating the adjustment plate.

[0008] Furthermore, the test system also includes a controller, which is connected to the detection device, the imaging device, the sliding drive mechanism, and the rotation mechanism. The controller determines the detection angle between the two adjustment plates and the second distance between the two radiation sources fixed on the two adjustment plates according to the imaging information of the imaging device, and controls the sliding drive mechanism to adjust the position of the clamp according to the detection angle and the second distance.

[0009] Furthermore, the testing system also includes an adjustment mechanism that adjusts the distance between the support and the placement plate.

[0010] Furthermore, the testing system also includes environmental sensors, which are mounted on the placement plate to monitor environmental parameters of the area.

[0011] Furthermore, the controller is also connected to environmental sensors. The controller receives measurement data from the imaging device, inputs the measurement data and environmental parameters into a pre-trained correction model, and obtains the corrected target measurement data.

[0012] To achieve the above objectives, a second aspect of the present invention provides a method for radiation imaging, employing the experimental system described in any of the above claims, comprising the following steps: Radiation source fixing step S1: Fix the radiation source in the clamp on the adjustment plate; Radiation source position adjustment step S2: Adjust the distance between the placement plate and the support through the adjustment mechanism, thereby adjusting the distance between the imaging device and the radiation source; Adjustment plate angle adjustment step S3: The controller controls the rotation mechanism to drive the two adjustment plates to rotate according to the difference between the calculated detection angle and the target angle in the preset strategy, until the included angle of the two adjustment plates reaches the preset requirement.

[0013] Furthermore, in the adjustment plate angle adjustment step S3, the controller uses an image recognition algorithm to analyze the posture of the two adjustment plates.

[0014] Furthermore, the image recognition algorithm processes the image of the adjustment plate acquired by the imaging device, extracts the edge features of the adjustment plate, and calculates the relative angle.

[0015] Furthermore, the adjustment plate angle adjustment step S3 includes the following sub-steps: Image preprocessing step S31: The original image is converted to grayscale and Gaussian filtered to eliminate noise. Then, adaptive threshold segmentation is used to highlight the contrast between the adjustment plate and the background, and the target area containing the adjustment plate is separated. Region of interest extraction step S32: The outline of the circular block of the adjustment plate is located and fixed by edge detection. The region of interest is defined within the area of ​​the circular block to reduce the calculation range and reduce interference. Edge detection step S33: The edge outline of the region of interest is extracted, and the long edge of the adjustment plate is preserved. Line fitting step S34: The extracted edge points are subjected to Hough transform to detect lines. The two longest lines belonging to the two adjustment plates are selected. Then, the edge points on the lines are fitted by the least squares method to obtain the exact equations of the two lines. Angle calculation step S35: The relative angle is calculated based on the direction angle of the two lines. If the angle is greater than 90°, the supplementary angle is taken.

[0016] Furthermore, the method also includes a correction step S4, in which the measurement data and environmental parameters are input into a pre-trained correction model to obtain the corrected target measurement data.

[0017] Furthermore, in the correction step S4, the step model can adopt a random forest regression model, which can effectively capture the nonlinear relationship between environmental parameters and measurement bias.

[0018] Furthermore, in step S4, the random forest model is lightweighted.

[0019] By applying the above-described technical solution of the present invention, at least the following technical effects are achieved: 1. This test system, by setting up a rotation mechanism and an adjustment mechanism, can flexibly adjust the distance and position between the radiation imaging equipment and the radiation source, thereby improving the accuracy and efficiency of the test.

[0020] 2. The radiation imaging method of this experimental system analyzes the relative posture of the two adjustment plates in the image through image recognition algorithm, realizes the adjustment of the test state according to the preset detection strategy, and automatically measures the data of each test state corresponding to the preset detection strategy, thereby improving the testing efficiency.

[0021] 3. The radiation imaging method of this experimental system can effectively capture the nonlinear relationship between environmental parameters and measurement deviations through the correction model, and has strong anti-interference ability, making it suitable for real-time correction in engineering scenarios.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the front cross-sectional structure of a test bench for a radiation imaging device provided by the present invention; Figure 2 This is a front view structural schematic diagram of a test bench for a radiation imaging device provided by the present invention; Figure 3 This is a partial front view sectional view of a test rig for a radiation imaging device provided by the present invention; Figure 4 This is a side view of the structure of the central circular block and two adjusting plates provided by the present invention; Figure 5 This is an assembly drawing of the driven gear and rack provided by the present invention; Figure 6 This is an assembly drawing of the second cylinder, mounting plate, and annular plate provided by the present invention; Figure 7 This is an assembly drawing of the placement plate and height adjustment mechanism provided by the present invention; Figure 8 This is an assembly diagram of the annular plate and the locking strip provided by the present invention; Figure 9 This is an assembly drawing of the protective cover, sprocket, chain, and connector provided by the present invention; Figure 10 This is an assembly drawing of the connecting cylinder and the rectangular rod provided by the present invention; Figure 11 for Figure 1 An enlarged structural diagram of part A shown in the figure; Figure 12 for Figure 1 An enlarged structural diagram of part B shown in the figure; Figure 13 for Figure 3 The diagram shows an enlarged view of section C.

[0024] Reference numerals: 1. Base; 2. Placement plate; 3. Support; 4. Circular block; 5. Adjusting plate; 6. Clamp; 7. Laser; 8. Detection device; 9. Controller; 10. Sliding rod; 11. Sliding block; 12. Tightening rod; 13. First scale; 14. Driven gear; 15. Electric telescopic rod; 16. Rack; 17. Fixing block; 18. One-way screw; 19. Connecting block; 20. Protective cover; 21. Disc; 22. Motor; 23. First 24. Rectangular telescopic rod; 25. Fixing plate; 26. First cylinder; 27. Threaded rod; 28. Threaded cylinder; 29. ​​Connecting cylinder; 30. Rectangular rod; 31. Bevel gear; 32. Guide rod; 33. Guide block; 34. Second cylinder; 35. Mounting plate; 36. Annular plate; 37. Second rectangular telescopic rod; 38. Differential wheel; 39. Sprocket; 40. Chain; 41. Double-acting screw; 42. Connecting block; 43. Clamping plate; 44. Second scale. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] The present invention will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed by the present invention.

[0027] This invention provides a radiation imaging test system, including an adjustment plate assembly, an imaging device, a detection device 8, a base 1, and a placement plate 2 mounted on the base 1 for placing the radiation imaging device. The placement plate 2 has a laser positioning mark that receives laser light output from a laser 7. The adjustment plate assembly is fixed to the base 1 by a bracket 3 and includes two or more adjustment plates 5 and a radiation source fixed to the adjustment plates 5 by clamps 6. The imaging device is mounted on the placement plate 2 for imaging the adjustment plate assembly. The detection device 8 measures a first distance between the laser positioning mark and the laser 7, providing data support for calibrating the relative distance between the radiation source and the imaging device. The distance between the imaging device and the radiation source on this patented test bench is adjustable, enabling clearer and more accurate images to be obtained even under conditions of high radiation source intensity or complex imaging environments.

[0028] Figures 1-3 The experimental system shown includes: a base 1, a placement plate 2, a bracket 3, a circular block 4, an adjustment plate 5, a clamp 6, a first scale 13, a laser 7, a detection device 8, a rotation mechanism, a sliding drive mechanism, an adjustment mechanism, an imaging device, and a controller 9.

[0029] A placement plate 2 is mounted on a base 1 for placing a radiation imaging device. A laser positioning marker is provided on the placement plate. A bracket 3 is fixedly mounted on the top of the base 1, and a circular block 4 is rotatably mounted on the bracket 3. A set of adjustment plates 5 are mounted on the circular blocks 4. Each adjustment plate 5 is equipped with a clamp 6 that slides through it, used to fix the radiation source. A first scale 13 for positioning the clamps is mounted on one side of each adjustment plate 5. A laser 7 and a detection device 8 are fixedly mounted on one side of the circular block 4. The laser 7 outputs laser light to the laser positioning marker, and the detection device 8 measures the first distance between the laser positioning marker and the laser 7 based on reflected laser light. A rotation mechanism is mounted on the bracket 3 for rotating the adjustment plates 5, and a sliding drive mechanism drives the clamps 6 to slide on their respective adjustment plates 5. An adjustment mechanism is mounted on the base 1 for adjusting the distance between the placement plate 2 and the bracket 3. This experimental system, by incorporating a rotation mechanism and an adjustment mechanism, enables flexible adjustment of the distance and position between the radiation imaging device and the radiation source, improving the accuracy and efficiency of the test.

[0030] like Figure 11 As shown, the detection device 8 can be located below the laser 7. A controller 9 can be fixedly installed on the top of the base 1. A slide bar 10 is installed on the adjusting plate 5, and a slider 11 is slidably mounted on the slide bar 10. The slider 11 is fixedly connected to the clamp 6. A screw rod 12 is threaded onto one side of the slider 11, and a first scale 13 is installed on one side of the adjusting plate 5. The slide bar 10 provides a sliding track for the slider 11, allowing the slider 11 to move along the slide bar. By moving the slider 11, the clamp 6 and its radiation source can be moved along the slide bar. The design of the slider 11 allows for more precise adjustment of the radiation source's position, improving the accuracy of the test. Simultaneously, the first scale 13 provides a clear view of the positions of the slider 11 and the radiation source, facilitating precise adjustments.

[0031] The base 1 serves as the fundamental support structure for the entire device. A placement plate 2 on top of the base 1 is specifically designed to hold the radiation imaging equipment, and the laser positioning markers on the placement plate provide a reference for the initial position calibration of the imaging equipment. A bracket 3 is fixedly mounted on top of the base 1, and a rotating circular block 4 on it allows for angle adjustment. A set of adjustment plates 5 mounted on the circular block 4 serves as the support for the radiation source. Each adjustment plate 5 is equipped with a sliding clamp 6, which secures the radiation source. A first scale 13 on one side of the adjustment plate 5 precisely marks the sliding position of the clamp 6, thus enabling quantitative adjustment of the lateral position of the radiation source. A laser 7 fixedly mounted on one side of the circular block 4 emits a laser beam to the laser positioning marker on the placement plate 2. In conjunction with a detection device 8, the initial distance between the laser positioning marker and the laser 7 can be accurately obtained by measuring the reflected laser beam, providing data support for the relative distance calibration between the radiation source and the imaging equipment. The rotating mechanism on the bracket 3 can drive the adjusting plate 5 to rotate together with the circular block 4, thereby adjusting the angle of the radiation source. The sliding drive mechanism drives each clamp 6 to slide on the corresponding adjusting plate 5, further refining the lateral position of the radiation source. The adjusting mechanism on the base 1 can adjust the distance between the placement plate 2 and the bracket 3, that is, adjust the longitudinal distance between the imaging device and the radiation source.

[0032] Figure 4 The diagram illustrates two radioactive sources fixed in clamps 6 on two adjusting plates 5. The position and angle of the radioactive sources are adjusted via a rotation mechanism, while the distance between the placement plate 2 and the support 3 is also adjusted via the same mechanism. This, in turn, adjusts the distance between the radiation imaging device and the radioactive sources. The detector position and solid angle are then adjusted. A detachable, calibrated portable gamma dose rate meter is also mounted on the placement plate. The gamma dose rate meter detects the intensity of the radioactive sources; a weak intensity results in a low dose rate. If imaging can still be performed at this point, it indicates good imaging performance and high detection efficiency. The radiation imaging device is activated to image the two radioactive sources, simultaneously verifying the critical distance at which the two sources are aligned with the detector at a solid angle—that is, the distance at which they can still be distinguished as two separate sources, rather than mixed together. The imaging results are then observed and recorded. Subsequent analysis is performed based on the imaging results and measurement data. The adjusting mechanism allows for flexible adjustment of the distance between the radiation imaging device and the radioactive sources, solving the problem of non-adjustable distances on traditional test benches. The rotation mechanism and components such as the slider 10 and slider 11 on the adjusting plate 5 enable precise adjustment of the radioactive source position and angle, improving the accuracy and flexibility of the test.

[0033] The test bench also includes an imaging device and a controller 9. The imaging device is mounted on the placement plate 2 and is used to image the circular block 4 and the adjustment plate 5 on the circular block. The imaging device on the placement plate 2 can image the circular block 4 and the adjustment plate 5 to record the position and state of the radiation source, ensuring that the entire device, through the coordinated action of its components, can achieve precise adjustment and monitoring of the position, angle, and distance between the radiation imaging equipment and the radiation source, providing stable and reliable experimental conditions for radiation imaging testing.

[0034] The controller 9 is connected to the detection device 8, the sliding drive mechanism, the rotation mechanism, the adjustment mechanism, and the imaging device. Based on the imaging information from the imaging device, the controller determines the detection angle between the two adjustment plates 5 and the second distance between the two radiation sources. According to the preset detection strategy and the first distance, it controls the adjustment mechanism to adjust the distance between the placement plate 2 and the support 3. Based on the preset detection strategy and the detection angle, it controls the rotation mechanism to adjust the angle between the two adjustment plates 5. Based on the preset detection strategy, the detection angle, and the second distance, it controls the sliding drive mechanism to adjust the position of the clamp 6. It should be noted that the user can adjust the preset detection strategy according to their needs. After the user adjusts the preset detection strategy, the controller can adjust the test state and perform measurements according to the preset detection strategy.

[0035] Figure 5 The rotating mechanism shown includes: a driven gear 14 fixedly mounted on the output rod of the circular block 4; an electric telescopic rod 15 fixedly mounted on the bracket 3; a rack 16 mounted on the electric telescopic rod 15, the rack 16 meshing with the driven gear 14; and an I-beam fixedly mounted on one side of the bracket 3, the I-beam slidingly connected to the rack 16.

[0036] When the adjustment plate 5 needs to be rotated, the extension and retraction of the electric telescopic rod 15 is first controlled to drive the rack 16 to slide on the I-beam block, which in turn drives the driven gear 14 to rotate. The driven gear 14 then drives the circular block 4 and the radiation source on the adjustment plate 5 to rotate. Through the meshing of the driven gear 14 and the rack 16, the electric telescopic rod 15 achieves precise control of the rotation angle of the circular block 4, improving the flexibility and accuracy of the test. The design of the electric telescopic rod 15 allows the rotation of the circular block 4 to be driven by electricity, realizing automated control of the rotation angle of the radiation source, improving the efficiency and accuracy of the test. The design of the I-beam block improves the stability of the rack 16's sliding, ensuring the accuracy of the rotation angle of the driven gear 14 and the circular block 4, thereby improving the accuracy and reliability of the test.

[0037] Figure 1 , Figure 12The adjustment mechanism includes: a fixing block 17 fixedly mounted on the top of the base 1; a one-way screw 18 rotatably mounted on the fixing block 17; a connecting block 19 threaded onto the one-way screw 18, the connecting block 19 being located below the placement plate 2; a protective cover 20 fixedly mounted on the top of the base 1, with a disc 21 provided inside the protective cover 20 and on the one-way screw 18, the two discs 21 being arranged opposite to each other; a motor 22 fixedly mounted on the top of the base 1 for driving the discs 21 to rotate; and a height adjustment mechanism provided on the connecting block 19 for adjusting the height of the placement plate 2.

[0038] Combination Figure 1 As can be seen, when it is necessary to adjust the distance between the radiation imaging device and the support 3, the two discs 21 are first brought into contact, and then the motor 22 is started to drive the discs 21 to rotate. The discs 21 drive the one-way screw 18 to rotate, which in turn drives the connecting block 19 to move horizontally. This causes the placement plate 2 to slide to the right, so that the placement plate 2 slides closer to the support 3. When the connecting block 19 slides, the pointer on the connecting block 19 slides along the second scale 43, which makes it easier for the operator to control the motor 22 to adjust the sliding distance of the connecting block 19. The design of the connecting block 19 enables precise adjustment of the height of the placement plate 2, allowing the distance between the radiation imaging device and the radiation source to be flexibly adjusted. The design of the protective cover 20 improves the safety and stability of the adjustment mechanism and ensures the smooth progress of the adjustment process.

[0039] Combination Figure 3 As can be seen, a first rectangular telescopic rod 23 is rotatably installed inside the protective cover 20. The output shaft of the motor 22 is fixedly connected to the output rod of the first rectangular telescopic rod 23. A fixing plate 24 is provided inside the protective cover 20. The fixing plate 24 is rotatably connected to the output rod of the disc 21. A first cylinder 25 is fixedly installed on one side of the inner wall of the protective cover 20. The output rod of the first cylinder 25 is fixedly connected to the fixing plate 24.

[0040] Combination Figure 3 Further explanation of the operation process when driving the connecting block 19 to slide: First, the first cylinder 25 is activated, causing its output rod to drive the fixed plate 24 and the disc 21 to slide until the two discs 21 are in close contact with each other. At this time, the output rod of the first rectangular telescopic rod 23 has slid out and is in an extended state, ensuring close contact between the two discs 21. Then, the motor 22 is activated, transmitting power to the discs 21 through the first rectangular telescopic rod 23, thereby driving the one-way screw 18 to rotate. The rotation of the one-way screw 18 will cause the connecting block 19 to move in the horizontal direction, thereby achieving precise adjustment of the distance between the placement plate 2 and the bracket 3. Through the design of the first rectangular telescopic rod 23, the output of the motor 22 can be transmitted to the discs 21 more flexibly, and its telescopic function can ensure that the two discs 21 can be in close contact with each other when needed, improving the stability and accuracy of the transmission.

[0041] Figure 7 The height adjustment mechanism includes: a threaded rod 26 rotatably mounted on the top of the connecting block 19, a threaded cylinder 27 threadedly sleeved on the threaded rod 26, the top end of the threaded cylinder 27 being fixedly connected to the placement plate 2; a mounting plate fixedly mounted on the top of the fixing block 17 near the disc 21, a connecting cylinder 28 rotatably mounted on the mounting plate; a rectangular rod 29 slidably sleeved inside the connecting cylinder 28; and a set of bevel gears 30 fixedly sleeved on one end of the rectangular rod 29 and the threaded rod 26, the set of bevel gears 30 meshing with each other.

[0042] Combination Figure 12 To further explain, when the height of the placement plate 2 needs to be adjusted, first rotate the connecting cylinder 28, causing the connecting cylinder 28 to drive the rectangular rod 29 to rotate, which in turn drives the bevel gear 30 to rotate. The rotation of the bevel gear 30 drives the threaded rod 26 to rotate, and simultaneously the threaded cylinder 27 moves accordingly, thereby causing the placement plate 2 to rise or fall. The threaded engagement between the threaded cylinder 27 and the threaded rod 26 enables precise adjustment of the height of the placement plate 2, improving the accuracy and reliability of the test. The design of the rectangular rod 29 allows the rotation of the bevel gear 30 to be transmitted through the connecting cylinder 28. Simultaneously, the sliding of the rectangular rod 29 within the connecting cylinder 28 does not affect the height adjustment of the placement plate 2 when the connecting block 19 slides. By employing a height adjustment mechanism composed of components such as the threaded rod 26, threaded cylinder 27, mounting plate, connecting cylinder 28, rectangular rod 29, and bevel gear 30, further precise adjustment of the height of the placement plate 2 is achieved, allowing for more flexible adjustment of the distance between the radiation imaging equipment and the radiation source, while simultaneously improving the efficiency and accuracy of the test.

[0043] Preferred, such as Figure 12 As shown, a guide rod 31 is fixedly installed on the top of the connecting block 19. A guide block 32 is slidably installed on the guide rod 31. The guide block 32 is fixedly connected to the bottom of the placement plate 2. A second scale 43 is fixedly installed on the top of the base 1. The second scale 43 is located on one side of the one-way screw 18. A pointer is fixedly installed on one side of the connecting block 19. The pointer slides in contact with the second scale 43.

[0044] Combination Figure 1 To further explain, the guide block 32 slides on the guide rod 31 as the placement plate 2 rises and falls, further ensuring the stable movement of the placement plate 2 in the vertical direction, enhancing the stability of the lifting and lowering of the placement plate 2, while simplifying the structure and reducing manufacturing costs. The second scale 43 provides an intuitive reading of the position of the placement plate 2, making it easy for users to quickly understand the current distance between the placement plate and the bracket and make adjustments. As the connecting block 19 slides left and right, the pointer slides on the second scale 43, indicating the current position of the placement plate 2.

[0045] Figure 6 Show, Figure 9 , Figure 13 The assembly relationship of the second cylinder 33, mounting plate 34, and annular plate 35 is shown. The second cylinder 33 is fixedly installed inside the protective cover 20, and the mounting plate 34 is fixedly installed on the output rod of the second cylinder 33. Annular plates 35 are provided on both the mounting plate 34 and the connecting cylinder 28, and the two annular plates 35 are arranged opposite each other. A second rectangular telescopic rod 36 is rotatably installed on one side of the inner wall of the protective cover 20. Differential wheels 37 are provided on both the second rectangular telescopic rod 36 and the annular plate 35 located on the mounting plate 34. The two differential wheels 37 mesh, and the output rod of the upper differential wheel 37 is fixedly connected to the output rod of the second rectangular telescopic rod 36. Sprockets 38 are fixedly sleeved on the output rods of both the first rectangular telescopic rod 23 and the second rectangular telescopic rod 36, and chains 39 are sleeved on the two sprockets 38, with the chains 39 meshing with the two sprockets 38.

[0046] Combination Figure 3 , Figure 10 When adjusting the height of the placement plate 2, first, move the two discs 21 on one side of the one-way screw 18 away from each other. Then, start the second cylinder 33, causing the second cylinder 33 to drive the annular plate 35 to slide. At the same time, the output rod of the second rectangular telescopic rod 36 slides out, causing the two annular plates 35 to contact each other. Then, start the motor 22, causing the motor 22 to drive the differential wheel 37 to rotate through the meshing of the sprocket 38 and the chain 39. This causes the differential wheel on the second rectangular telescopic rod 36 to drive the differential wheel on the annular plate 35 to rotate, which in turn causes the annular plate 35 to drive the connecting cylinder 28 to rotate. This causes the connecting cylinder 28 to drive the rectangular rod 29 to rotate synchronously. When the rectangular rod 29 rotates, it synchronously drives the bevel gear. The rotation of motor 22 causes the bevel gear 30 to drive the threaded rod 26 to rotate, thereby adjusting the height of the placement plate 2. Through the setting of a set of differential gears 37, the power transmission and conversion are realized, so that the rotation of motor 22 can be transmitted to connecting cylinder 28, which in turn drives rectangular rod 29 and bevel gear 30 to rotate, ultimately realizing the adjustment of the height of placement plate 2. Through the setting of sprocket 38 and chain 39, the power transmission between motor 22 and second rectangular telescopic rod 36 is realized, so that the rotation of motor 22 can be easily transmitted to differential gear 37 on second rectangular telescopic rod 36, thereby driving connecting cylinder 28, rectangular rod 29 and bevel gear 30.

[0047] Figure 9In the design, a baffle is detachably installed on one side of the protective cover 20, covering the sprocket 38 and the motor 22. Both the protective cover 20 and the baffle have connection ports on one side, which are adapted to the rectangular rod 29. The baffle effectively prevents external debris or dust from entering the working area of ​​the sprocket 38 and the motor 22, keeping them clean and operating normally. It also provides additional safety protection for operators who may come into contact with the sprocket 38 and the motor 22, reducing the risk of accidental contact or injury. Because the baffle is detachable, it can be easily removed when maintenance or inspection of the sprocket 38 or the motor 22 is required, improving maintenance convenience.

[0048] Figure 8 The diagram shows two discs 21 and two annular plates 35, each equipped with a retaining strip and an anti-slip pad, which are arranged as a set and opposite to each other.

[0049] Combination Figure 3 To further explain, a locking strip is installed on either of the two discs 21 and the two annular plates 35. The locking strip is designed to provide a locking or fixing mechanism. An anti-slip pad is installed on the other disc 21 and the annular plate 35. The main function of the anti-slip pad is to increase friction and prevent slippage or detachment during use. When the two discs 21 and the two annular plates 35 are in contact or engaged, the locking strip and the anti-slip pad work together. The locking strip provides physical locking to ensure that the connection between the components will not be easily separated by external force, while the anti-slip pad prevents slippage by increasing friction, further enhancing the stability of the connection.

[0050] Preferably, the test bench also includes an environmental sensor, which is mounted on the placement plate 2 and is used to monitor the environmental parameters of the area.

[0051] The controller 9 is also connected to the environmental sensor and the radiation imaging device. The controller 9 is used to receive the measurement data of the radiation imaging device under different test conditions on the test bench, input the measurement data and environmental parameters into the pre-trained correction model to obtain the corrected target measurement data, and generate a structured data document according to the preset detection strategy and the target measurement data under each test condition corresponding to the preset detection strategy.

[0052] To further improve the effectiveness of this experimental system, in addition to Embodiment 1 described above, this invention also provides Embodiment 2: Combination Figure 7The placement plate 2 has a sliding opening, and a bidirectional screw 40 is rotatably installed on the bottom of the placement plate 2. The bidirectional screw 40 passes through the threaded cylinder 27, and two connecting blocks 41 are threaded on the bidirectional screw 40. The top of each of the two connecting blocks 41 is fixedly installed with a clamping plate 42 for clamping and fixing the radiation imaging equipment.

[0053] In Embodiment 2, by rotating the bidirectional screw 40, the distance between the two connecting blocks 41 can be easily adjusted, thereby adjusting the clamping force and position of the clamping plate 42 on the radiation imaging device, achieving stable clamping and fixation of the radiation imaging device. By adding components such as the sliding mouth, bidirectional screw 40, connecting blocks 41, and clamping plate 42, flexible installation and stable clamping of the radiation imaging device are achieved. Users can adjust the position and clamping force of the clamping plate 42 according to actual needs to adapt to radiation imaging devices of different sizes or shapes. This design not only improves the compatibility and flexibility of the device, but also ensures the stability and safety of the radiation imaging device during the testing process.

[0054] The present invention also provides a radiation imaging method using the above-mentioned experimental system, comprising the following steps: radiation source fixing step S1: fixing the radiation source in the clamp 6 on the adjusting plate 5; radiation source position adjustment step S2: adjusting the distance between the placement plate 2 and the support 3 through the adjusting mechanism, thereby adjusting the distance between the imaging device and the radiation source; adjusting plate angle step S3: the controller 9 controls the rotation mechanism to drive the two adjusting plates 5 to rotate according to the difference between the calculated detection angle and the target angle in the preset strategy, until the included angle of the two adjusting plates 5 reaches the preset requirement.

[0055] Specifically, the detection device 8 is used to detect whether the relative position between the radiation imaging device and the radiation source is accurate, and whether the position of the radiation imaging device is appropriate, to ensure the accuracy of the test and that the imaging quality is consistent with expectations. The controller 9 is used to control the operation of the entire test bench, including starting and stopping the rotating mechanism and raising and lowering the adjusting mechanism. Specifically, the controller can receive the imaging information of the circular block 4 and the adjusting plate 5 from the imaging device, analyze the relative posture of the two adjusting plates 5 in the image through an image recognition algorithm, calculate the detection angle between them, that is, the relative placement angle of the radiation source, and at the same time, identify the position of the radiation source fixed on the clamp 6 in the image based on the first scale 13, and calculate the second distance between the two radiation sources, that is, the lateral distance. On this basis, the controller calls the preset detection strategy, which can include multiple test states, each of which contains the test parameters required for the test. Combined with the first distance measured by the detection device 8, that is, the longitudinal distance between the laser positioning mark and the laser, it reflects the longitudinal distance between the radiation source and the imaging device, and drives the adjusting mechanism to adjust the distance between the placement plate 2 and the support 3 so that the longitudinal distance meets the preset standard. Regarding the angles of the two adjustment plates 5, the controller controls the rotation mechanism to drive the two adjustment plates 5 to rotate based on the difference between the calculated detection angle and the target angle in the preset strategy, until the included angle between them reaches the preset requirement.

[0056] In addition, the controller integrates the detection angle, the second distance, and the radiation source position parameters in the preset strategy to drive the sliding drive mechanism, such as the stepper motor, to slide the clamp along the adjustment plate. In conjunction with the first scale 13, the position of the clamp 6 is precisely adjusted, so that the relative angle and spacing of the two radiation sources match the test requirements. Through the coordinated control of each mechanism, the radiation imaging equipment is ensured to work stably under preset conditions, realizing automatic testing of different test states. There is no need to manually adjust the test bench when changing the test state, thereby improving the accuracy and efficiency of the test.

[0057] In step S3 of adjusting the angle of the adjustment plate, the controller 9 uses an image recognition algorithm to analyze the posture of the two adjustment plates 5.

[0058] The image recognition algorithm processes the image containing two adjustment plates 5 acquired by the imaging device, extracts the edge features of the adjustment plates, and calculates their relative angle. The adjustment plate angle adjustment step S3 includes the following sub-steps: image preprocessing step S31; region of interest extraction step S32; edge detection step S33; line fitting step S34; and angle calculation step S35. The radiation imaging method of this experimental system analyzes the relative posture of the two adjustment plates in the image using the image recognition algorithm, realizes the adjustment of the experimental state according to the preset detection strategy, and automatically measures the data under each experimental state corresponding to the preset detection strategy, thus improving testing efficiency.

[0059] In the image preprocessing step S31, the original image is converted to grayscale and subjected to Gaussian filtering to eliminate noise. Then, adaptive threshold segmentation is used to highlight the contrast between the adjustment panel and the background, separating the target region containing the adjustment panel. The filter kernel size is 5×5, the standard deviation σ=1.0, and the threshold range is 120-200.

[0060] In step S32, based on prior knowledge, namely that the adjustment plate is fixed on the circular block 4, the outline of the circular block 4 is located by edge detection, and the region of interest is defined within the area of ​​the circular block 4 to reduce the calculation range and reduce interference.

[0061] In edge detection step S33, the Canny operator is used to extract the edge contours within the ROI, preserving the long edge of the adjustment plate, as the adjustment plate is a long strip structure with straight-line features on its long edge. The Canny operator uses a high threshold of 200 and a low threshold of 100.

[0062] In the straight line fitting step S34, the extracted edge points are subjected to Hough transform to detect straight lines, and the two longest straight lines belonging to the two adjustment plates are selected. The length of the straight lines must exceed 80% of the actual length of the adjustment plates. Then, the edge points on the straight lines are fitted using the least squares method to obtain the accurate equations of the two straight lines. The accumulator threshold of the Hough transform is 150, and the angle step size is 0.5°.

[0063] In angle calculation step S35, the relative angle is calculated based on the direction angle of the two straight lines. If the angle is greater than 90°, the supplementary angle is taken because the relative angle of the adjustment plate is an acute angle or a right angle.

[0064] The process of calculating the direction angle of a straight line is as follows: Let the two straight lines on the edges of the adjustment plate after fitting be line 1 and line 2, and let the two points on line 1 be x and y respectively. 11 y 11 and x 12 y 12 Two points on line 2 are x and x. 21 y 21 and x 22 y 22 Then the slopes of the two lines are respectively:

[0065] The angle between the straight line and the positive x-axis is:

[0066] It should be noted that the direction angle range is [-90°, 90°], which is converted to [0°, 180°] by quadrant determination.

[0067] The relative angle between two straight lines is determined by the absolute value of the difference in direction angles. If the difference exceeds 90°, the supplementary angle is used.

[0068] in, θ This refers to the detection angle between the two adjustment plates 5.

[0069] To calculate the second distance between the two radiation sources, the parameter information of the first scale 13 can be obtained first. Then, its scale features are extracted through image processing: first, preprocessing is performed, and the image of the adjustment plate acquired by the imaging device is grayscaled and thresholded to highlight the grayscale difference between the scale and the background. Then, morphological operations such as erosion and dilation are used to remove noise from the edges of the scale lines. Then, the scale lines and zero point are located. Edge detection such as the Sobel operator is used to extract the scale lines of the scale. The straight line direction of the scale lines is fitted by Hough transform to make it parallel to the length direction of the adjustment plate. The zero point of the scale, such as the starting point of the left end of the adjustment plate, is used as the origin of the coordinate system to identify the pixel coordinates of adjacent scale lines in the image.

[0070] Let the actual length L correspond to the image pixel distance as Δp= | p 10 -p 0 If |, then the pixel equivalent k is: k = L / Δp. It should be noted that if the ruler is tilted, the image needs to be corrected through perspective transformation to ensure that the scale lines are parallel to the image's x-axis, avoiding angular errors affecting the pixel equivalent.

[0071] The radiation source is fixed to clamp 6, which is slidably connected to adjusting plate 5. Its position corresponds to the scale markings on the first ruler. Therefore, the coordinates of the radiation source can be determined by identifying the clamp's position on the ruler. Clamp 6 has a specific shape, such as a U-shape. Through template matching, using the clamp image as a template, its center pixel coordinates pc1 and pc2 are located in the adjusting plate image, corresponding to the clamps on the two adjusting plates respectively. The center of the clamp coincides with the geometric center of the radiation source, with a preset installation accuracy. Therefore, the pixel coordinates of the clamp are the pixel coordinates of the radiation source; combined with the pixel coordinates of the ruler's zero point... p 0 The actual transverse coordinates of the radioactive source along the length of the adjustment plate are: xi=k·(pci-p0), where i=1 or 2, corresponding to the two radioactive sources respectively.

[0072] Based on the coordinate system established by calculating the detection angle between the two adjustment plates 5, the coordinates of the two radiation sources can be determined based on the detection angle and the actual lateral coordinates corresponding to the radiation sources. Then, by solving the distance between the two coordinates, the second distance can be determined.

[0073] The controller can control the adjustment mechanism, rotation mechanism and sliding drive mechanism based on the received measurement data and preset detection strategy to realize the test state adjustment of the corresponding preset detection strategy, and automatically measure the data of each test state corresponding to the preset detection strategy, thereby improving the test efficiency.

[0074] The radiation imaging method also includes a correction step S4, in which measurement data and environmental parameters are input into a pre-trained correction model to obtain corrected target measurement data.

[0075] The environmental sensors on the test bench are mounted on the placement plate 2 and can monitor key environmental parameters of the test area in real time. These parameters can include at least one of temperature, relative humidity, and atmospheric pressure, and additional parameters, such as the background radiation value, can be added as needed. These parameters directly or indirectly affect the measurement accuracy of the radiation imaging equipment. For example, temperature changes may cause detector sensitivity drift, and excessive humidity may cause circuit interference. The controller 9, as the core of the control, not only connects to the various actuators and detection devices, but also establishes data interaction with the environmental sensors and the radiation imaging equipment. The controller 9 collects the raw measurement data output by the radiation imaging equipment under different test conditions, and simultaneously acquires the real-time environmental parameters monitored by the environmental sensors. Then, it inputs both types of data into the pre-trained correction model. This correction model learns the mapping relationship between environmental parameters and measurement deviations through historical data. It can correct the original measurement data to eliminate environmental interference and finally output the corrected target measurement data, which is the standardized data after removing the environmental influence. Based on this, the controller will record the parameters corresponding to each test state and the target measurement data in the relevant area of ​​the predefined template file according to the preset detection strategy, and finally organize them into a structured data document so that technicians can quickly review the test process and determine the test results based on the test data.

[0076] The correction model can employ a random forest regression model, which effectively captures the nonlinear relationship between environmental parameters and measurement biases, and possesses strong anti-interference capabilities, making it suitable for real-time correction in engineering scenarios. The input feature vector is: X=[ T , H , P , M raw ],in T For ambient temperature, H Relative humidity, P Atmospheric pressure, M raw The raw measurement data from the radiation imaging equipment, such as radiation count rate and image grayscale value, are used; the units vary depending on the parameter type. The output of the correction model is the measurement bias. ΔM That is, the original measurement valueM raw Compared with the true value M true The model predicts the difference by learning the mapping relationship between input features and bias. ΔM Corrected target data: M true = M raw - ΔM pred ,in ΔM pred This represents the bias in the model prediction. The radiation imaging method used in this experimental system can effectively capture the nonlinear relationship between environmental parameters and measurement bias through a correction model, and it has strong anti-interference capabilities, making it suitable for real-time correction in engineering scenarios.

[0077] It should be noted that a random forest consists of N independently trained decision trees {f1(X), f2(X), ..., fN(X)}. The risk of overfitting is reduced by integrating the predictions from all trees, as detailed below: Each decision tree is built based on randomly sampled training samples and a randomly selected subset of features (e.g., randomly selecting 2 features from 4 input features during each split). The trees are recursively split, such as by dividing the samples based on equal conditions. The output of each leaf node is the mean of the biases of all samples within that node. A single decision tree predicts the bias as follows:

[0078] in, Leaf i Let n be the leaf nodes of the i-th tree that contain the input X. i This represents the number of training samples within that leaf node. ΔM k This represents the actual deviation of the k-th sample.

[0079] The final prediction of bias by the random forest is the mean of the predictions from all decision trees:

[0080] Subtracting the model prediction bias from the original measurement data yields the target data after eliminating environmental interference:

[0081] In applications, to embed the correction model into the controller, the random forest model can be lightweighted. This can be achieved through multi-dimensional optimization: First, reduce the model size by greedily pruning based on the validation set, removing decision trees with low prediction contributions. For example, reduce the number of trees from 50-200 to 20-30. Simultaneously, limit the maximum depth of a single tree from 10-20 layers to 5-8 layers and set a minimum number of leaf nodes (≥5) to reduce invalid branches and parameter redundancy. Second, simplify the feature dimensions by retaining core inputs such as temperature and original measurements based on feature importance, removing low-contribution features such as atmospheric pressure, and discretizing continuous features into finite intervals (e.g., temperature divided into 3 levels), replacing floating-point numbers with integer encoding to reduce splitting dimensionality and computational complexity. Finally, prune and merge the tree structure, such as merging similar leaf nodes, to further reduce redundant data.

[0082] In summary, this device enables flexible adjustment of the distance and position between the radiation imaging equipment and the radiation source, improving the accuracy and efficiency of the test.

[0083] By applying the above-described technical solution of the present invention, at least the following technical effects are achieved: 1. This test system, by setting up a rotation mechanism and an adjustment mechanism, can flexibly adjust the distance and position between the radiation imaging equipment and the radiation source, thereby improving the accuracy and efficiency of the test; 2. The radiation imaging method of this test system analyzes the relative posture of the two adjustment plates in the image through image recognition algorithm, realizes the test state adjustment of the corresponding preset detection strategy, and automatically measures the data of each test state corresponding to the preset detection strategy, thereby improving the test efficiency. 3. The radiation imaging method of this experimental system can effectively capture the nonlinear relationship between environmental parameters and measurement deviations through the correction model, and has strong anti-interference ability, making it suitable for real-time correction in engineering scenarios.

[0084] The above are merely several specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0085] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0086] For the foregoing method embodiments, in order to simplify the description, they are all described as a series of actions. However, those skilled in the art should know that this application is not limited to the described order of actions, because according to this application, some steps may be performed in other orders or simultaneously.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A radiation imaging experimental system, characterized in that, The test system includes: A base (1) and a placement plate (2) provided on the base (1) for placing a radiation imaging device. The placement plate (2) is provided with a laser positioning mark, which receives the laser output by the laser (7). Adjustment plate assembly, the adjustment plate assembly is fixed on the base (1) by a bracket (3), the adjustment plate assembly includes two or more adjustment plates (5), and a radiation source fixed on the adjustment plate (5) by a clamp (6); An imaging device is disposed on the placement plate (2) for imaging the adjustment plate assembly; The detection device (8) measures the first distance between the laser positioning mark and the laser (7) to provide data support for the relative distance calibration between the radiation source and the imaging device.

2. The testing system according to claim 1, characterized in that, The test system also includes a sliding drive mechanism, which drives the clamp (6) to slide on the adjustment plate (5).

3. The testing system according to claim 2, characterized in that, The test system also includes a rotation mechanism for rotating the adjustment plate (5).

4. The testing system according to claim 3, characterized in that, The test system also includes a controller (9), which is connected to the detection device (8), the imaging device, the sliding drive mechanism and the rotation mechanism respectively. The controller (9) determines the detection angle between the two adjustment plates (5) and the second distance between the two radiation sources fixed on the two adjustment plates (5) respectively according to the imaging information of the imaging device, and controls the sliding drive mechanism to adjust the position of the clamp (6) according to the detection angle and the second distance.

5. The testing system according to claim 4, characterized in that, The test system also includes an adjustment mechanism that adjusts the distance between the support (3) and the placement plate (2).

6. The testing system according to claim 5, characterized in that, The test system also includes an environmental sensor, which is set on the placement plate (2) and is used to monitor the environmental parameters of the area.

7. The testing system according to claim 6, characterized in that, The controller (9) is also connected to the environmental sensor. The controller (9) receives the measurement data from the imaging device and inputs the measurement data and the environmental parameters into a pre-trained correction model to obtain the corrected target measurement data.

8. A method for radiation imaging, characterized in that, The testing system according to any one of claims 1-7 comprises the following steps: Step S1 for fixing the radioactive source: Fix the radioactive source in the clamp (6) on the adjusting plate (5); In step S2, the distance between the placement plate (2) and the support (3) is adjusted by the adjustment mechanism, thereby adjusting the distance between the imaging device and the radiation source; In step S3 of adjusting the angle of the adjustment plate, the controller (9) controls the rotating mechanism to drive the two adjustment plates (5) to rotate according to the difference between the calculated detection angle and the target angle in the preset strategy until the included angle of the two adjustment plates (5) reaches the preset requirement.

9. The radiation imaging method according to claim 8, characterized in that, In the adjustment plate angle adjustment step S3, the controller (9) uses an image recognition algorithm to analyze the posture of the two adjustment plates (5).

10. The radiation imaging method according to claim 9, characterized in that, The image recognition algorithm processes the image of the adjustment plate (5) acquired by the imaging device, extracts the edge features of the adjustment plate (5), and calculates the relative angle.

11. The method for radiation imaging according to claim 10, characterized in that, The adjustment plate angle adjustment step S3 includes the following sub-steps: Image preprocessing step S31: grayscale and Gaussian filtering are performed on the original image to eliminate noise, and then adaptive threshold segmentation is used to highlight the contrast between the adjustment plate (5) and the background, and the target area containing the adjustment plate (5) is separated. Region of Interest Extraction Step S32: The outline of the circular block of the adjustment plate (5) is fixed by edge detection, and the region of interest is defined within the area of ​​the circular block to reduce the calculation range and reduce interference; Edge detection step S33: Extract the edge contour within the region of interest, and retain the long edge of the adjustment plate (5); Line fitting step S34: Use Hough transform to detect the lines at the extracted edge points, select the two longest lines that belong to the two adjustment plates (5) respectively, and then fit the edge points on the lines using the least squares method to obtain the accurate equations of the two lines. Angle calculation step S35: Calculate the relative angle based on the direction angle of the two lines. If the angle is greater than 90°, take the supplementary angle.

12. The radiation imaging method according to claim 10, characterized in that, The method further includes a correction step S4, in which the measurement data and environmental parameters are input into a pre-trained correction model to obtain the corrected target measurement data.

13. The radiation imaging method according to claim 12, characterized in that, In the correction step S4, the step model can adopt a random forest regression model, which can effectively capture the nonlinear relationship between environmental parameters and measurement deviation.

14. The radiation imaging method according to claim 13, characterized in that, In step S4, the random forest model is lightweighted.

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