Automatic position calibration method and device for multi-source multi-detector X-ray detector

Abstract

The invention discloses an automatic position calibration method and device for a multi-source multi-detector X-ray detector, and belongs to the field of industrial nondestructive testing equipment, and the device comprises a plurality of infrared emitters, receivers and reflection targets which are installed on the X-ray detection equipment; the transverse and longitudinal positions, heights and angles between the radiation source and the object and between the radiation source and the detector are calculated and adjusted according to the emitted and reflected infrared rays in sequence, and finally automatic position calibration is achieved. According to the method, the labor cost of manual calibration can be effectively reduced, the calibration efficiency is improved, and meanwhile, the position calibration precision of the nondestructive testing equipment can be improved.

Description

Technical Field

[0001] The present invention relates to the field of industrial nondestructive testing equipment, and more specifically, to an automatic position calibration method and equipment for a multi-source multi-detector X-ray detector. Background Art

[0002] With the development of industrial technology, X-ray nondestructive testing equipment has been widely used in many fields, including material science, archeology, safety inspection, etc. In order to shorten the detection time, the nondestructive testing of long rod-shaped objects usually adopts a multi-source multi-detection scanning mode, which can perform nondestructive testing on different parts of the object at the same time, greatly improving the detection efficiency.

[0003] However, in actual use, this type of non-destructive scanning method is extremely sensitive to the position of the radiation source, object and detector. It is necessary to ensure that the radiation source, the center of the object and the center of the detector are in the same straight line. At the same time, it is necessary to ensure that the geometric relationship between the detection and the center section of the object is perpendicular to the X-ray. The accuracy of its position calibration has a significant impact on the quality of the final three-dimensional reconstructed image. Traditional position calibration methods usually rely on manual operation and refer to standard templates or preset parameters. First, it is necessary to prepare a standard template with sufficient spatial resolution and geometric features, such as a circular or grid-shaped marker. Place this marker in the actual device and use an X-ray detector to shoot it. Then the operator needs to manually process the acquired image and obtain the positional relationship between the detector and the source through measurement and calculation.

[0004] In this process, the operator needs to pay attention to the feature points in the image, such as boundaries, intersections or center points, and mark these feature points one by one through image processing software. Such operations are not only very cumbersome, but also time-consuming and easily lead to low calibration efficiency. Due to the subjectivity and inconsistency of manual operation, this traditional position calibration method is also prone to errors, resulting in inaccurate position calibration.

[0005] Errors may also occur in the process of manual template making, such as material deformation, geometric dimension deviation, and manual precision limitation, which further affect the accuracy of position calibration. When the position parameters of the detector or source change, this method also requires the entire calibration process to be repeated, increasing the workload and time cost.

[0006] These shortcomings limit the practical application of the traditional position calibration method based on manual operation, making it difficult to meet the requirements of high-quality and efficient image acquisition. Therefore, it is very necessary to develop an automated, high-precision and high-efficiency position calibration method and equipment.

[0007] In view of the above problems, there is an urgent need for an automatic position calibration method and related equipment for multi-source and multi-detector X-ray non-destructive testing instruments, which effectively solves the drawbacks of manual calibration and improves the calibration speed. The present invention discloses an automatic position calibration method and equipment for multi-source and multi-detector X-ray detectors, which realizes automatic position calibration between the X-ray sources, detectors and objects of traditional non-destructive testing equipment by adding infrared transmitters, receivers and reflection targets, combined with the relationship between positions and angles, and further improves the accuracy and efficiency of industrial non-destructive testing. Summary of the invention

[0008] The purpose of the present invention is to solve the problems of low efficiency and large errors in position calibration of existing multi-source and multi-detector X-ray detectors. More specifically, the invention aims to provide a method and device for automatic position calibration of multi-source and multi-detector X-ray detectors, so as to realize the position calibration of X-ray non-destructive testing equipment with automation, high precision and wide adaptability. The present invention realizes the accurate calculation of the geometric position relationship of the X-ray source, object and detector by adding equipment and materials such as infrared transmitters, receivers and reflective targets to the non-destructive testing equipment and the object to be tested, and finally uses a fine-tuning mechanism for calibration, thereby realizing the calibration of automated X-ray non-destructive testing equipment.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] A method and device for automatic position calibration of a multi-source and multi-detector X-ray detector, characterized in that: Figure 2 As shown, the following steps are included:

[0011] S1: Determine the number N of the detector and the radiation source, and preliminarily fix the radiation source, object and detector according to the rough size.

[0012] S2: Select the target positions of two objects that need to be aligned and attach reflective targets.

[0013] S3: Turn on the infrared transmitter and receiver ①, ② of each ray source.

[0014] S4: Adjust the height, horizontal and vertical positions and angles of the ray source platform to ensure that ① and ② emit infrared rays that are reflected at the target point and received by ① and ②.

[0015] S5: Determine whether the positions of the two target points on the object are perpendicular to the X-ray and whether the X-ray passes through the center of the object. If so, enter S6. If the conditions are not met, return to step S4 until the conditions are met.

[0016] S6: Fix the position of the ray source and the object.

[0017] S7: Turn on the movable infrared receiver ④ on the detector, receive the infrared signal from the infrared transmitter ①, and record the position.

[0018] S8: The movable infrared receiver ④ moves in the horizontal direction, receives the infrared signal from the infrared transmitter ②, and records the position.

[0019] S9: Turn on the infrared transmitter ⑥, and move the infrared receiver ④ in the vertical direction to receive the signal from the infrared transmitter ⑥ and record the position.

[0020] S10: Adjust the height, horizontal and vertical positions and angle of the detector according to the two positions.

[0021] S11: Determine whether the center of the detector passes through the X-ray and whether the detector plane is perpendicular to the X-ray. If yes, proceed to step S12; if not, return to step S8 until the condition is met.

[0022] S12: Fixed radio detector angle, lateral position, and height.

[0023] S13: Turn off the infrared ray source and receivers ①, ②, infrared transmitter ⑥ and infrared receiver ④.

[0024] S14: Turn on the infrared transmitter ③ of the previous detector and the infrared receiver ⑤ of the next detector in turn.

[0025] S15: Adjust the position of the next detector.

[0026] S16: Determine whether all detectors are on the same horizontal line. If yes, proceed to step S17. If not, return to step S15.

[0027] S17: Fix the longitudinal position of the radio detector.

[0028] S18: Turn off all infrared detectors and receivers.

[0029] Compared with the traditional multi-source multi-detector reconstruction method, the present invention has the following advantages:

[0030] Compared with the traditional manual calibration method, the present invention has the following significant advantages:

[0031] (1) Significantly improve efficiency: The traditional manual calibration method requires a lot of manpower and time. However, the position calibration method of the present invention is fully automatic, which greatly improves efficiency and saves the time and human resources required for calibration.

[0032] (2) Improved accuracy: Manual calibration may cause errors due to subjective factors, such as unfamiliarity with the image processing software or fatigue. The automatic position calibration method of the present invention can greatly reduce errors through precise algorithms and equipment, thereby improving the accuracy of calibration.

[0033] (3) Optimizing the workflow: In traditional methods, once the position parameters of the detector or source are changed, it is necessary to start all over again. However, the method of the present invention does not require this, and only requires updating the parameters accordingly, which greatly simplifies the workflow.

[0034] (4) Improved image quality: Since the present invention can achieve more accurate position calibration, higher quality images can be obtained, which is critical for subsequent steps such as image analysis, image reconstruction, and image parsing.

[0035] (5) Wide range of applications: Since the position calibration method and device of the present invention can be applied to various multi-source and multi-detector X-ray detectors, its scope of application is very wide and can be widely used in medical, detection, industrial detection and other fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the three-dimensional structure of the infrared transmitter, receiver and reflection target.

[0037] Figure 2 The present invention is a flow chart of an automatic position calibration method for a multi-source and multi-detector X-ray detector. DETAILED DESCRIPTION

[0038] In order to specifically describe the present invention, the technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods. At the same time, for the purpose of clear and explicit description, implementation examples and corresponding explanations will be given.

[0039] In this real-time example, it is assumed that the number of pairs of detectors and radiation sources is 10.

[0040] S1: First determine the number N of detectors and radiation sources (10 in this example), and then preliminarily arrange the radiation source, object and detector according to their approximate sizes.

[0041] S2: Select two target positions that need to be aligned on the object and attach reflective targets at these positions to facilitate subsequent infrared signal reflection.

[0042] S3: Start the infrared transmitters (transmitter ①) and infrared receivers (receiver ②) of all ray sources.

[0043] S4: Adjust the platform height, horizontal / vertical position and angle of the ray source so that the infrared rays emitted by the transmitter ① can be smoothly reflected on the target object and captured by the receiver ②.

[0044] S5: Determine whether the two set target points on the object are perpendicular to the X-ray, and check whether the X-ray passes through the center of the object. If this condition is met, proceed to step S6; if not, return to step S4 for fine-tuning until the condition is met.

[0045] S6: When the conditions are met, the positions of the ray source and the object need to be fixed.

[0046] S7: At this time, the movable infrared receiver (receiver ④) on the detector is turned on to receive the infrared signal from the infrared transmitter ① and record the coordinates of the signal in the lateral position.

[0047] S8: Then, the receiver ④ is moved in the horizontal direction to capture the infrared signal from the infrared transmitter ② and record the coordinates of the lateral position.

[0048] S9: Turn on the infrared transmitter ⑥ and move the infrared receiver ④ in the vertical direction to survey the signal from the infrared transmitter ⑥ and record the coordinates of the vertical position.

[0049] S10: According to the two coordinates in the horizontal and vertical directions, start adjusting the height, horizontal and vertical positions and angles of the detector.

[0050] S11: Determine whether the center point of the detector passes through the X-ray, and check whether the plane of the detector is perpendicular to the X-ray. If the conditions are met, proceed to step S12; if not, return to step S8 for adjustment until the conditions are met.

[0051] S12: After the conditions are met, the angle, lateral position and height of the detector are fixed.

[0052] S13: Turn off infrared transmitters ①, ② and ⑥, and infrared receiver ④.

[0053] S14: Then, the infrared transmitter (transmitter ③) of the previous detector and the infrared receiver (receiver ⑤) of the next detector are turned on in sequence.

[0054] S15: Adjust the position of the next detector to align it with the previous detector.

[0055] S16: Check whether all detectors are on the same horizontal line. If the condition is met, go to step S17; if not, return to step S15 for readjustment.

[0056] S17: When all detectors are located on the same horizontal line, fix the longitudinal position of the detectors.

[0057] S18: Finally, turn off all infrared transmitters and infrared receivers. At this point, the entire ray detection system has successfully completed automatic alignment. The present invention is not limited to the above-mentioned specific implementations, which are merely illustrative and not restrictive; under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A method and device for automatic position calibration of a multi-source and multi-detector X-ray detector, characterized in that: The steps include: S1: Determine the number N of the detector and the radiation source, and preliminarily fix the radiation source, object and detector according to the rough size. S2: Select the target positions of two objects that need to be aligned and attach reflective targets. S3: Turn on the infrared transmitter and receiver ①, ② of each ray source. S4: Adjust the height, horizontal and vertical positions and angles of the ray source platform to ensure that ① and ② emit infrared rays that are reflected at the target point and received by ① and ②. S5: Determine whether the positions of the two target points on the object are perpendicular to the X-ray and whether the X-ray passes through the center of the object. If so, enter S6. If the conditions are not met, return to step S4 until the conditions are met. S6: Fix the position of the ray source and the object. S7: Turn on the movable infrared receiver ④ on the detector, receive the infrared signal from the infrared transmitter ①, and record the position. S8: The movable infrared receiver ④ moves in the horizontal direction, receives the infrared signal from the infrared transmitter ②, and records the position. S9: Turn on the infrared transmitter ⑥, and move the infrared receiver ④ in the vertical direction to receive the signal from the infrared transmitter ⑥ and record the position. S10: Adjust the height, horizontal and vertical positions and angle of the detector according to the two positions. S11: Determine whether the center of the detector passes through the X-ray and whether the detector plane is perpendicular to the X-ray. If yes, proceed to step S12; if not, return to step S8 until the condition is met. S12: Fixed radio detector angle, lateral position, and height. S13: Turn off the infrared ray source and receivers ①, ②, infrared transmitter ⑥ and infrared receiver ④. S14: Turn on the infrared transmitter ③ of the previous detector and the infrared receiver ⑤ of the next detector in turn. S15: Adjust the position of the next detector. S16: Determine whether all detectors are on the same horizontal line. If yes, proceed to step S17. If not, return to step S15. S17: Fix the longitudinal position of the radio detector. S18: Turn off all infrared detectors and receivers.

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