A dual-source, dual-viewing angle passenger car rapid inspection device

Abstract

The present invention relates to a dual-source, dual-viewing angle passenger vehicle rapid inspection device, comprising a frame-type inspection channel, a radiation system, a detection system, and a data processing system. The inspection channel is provided with two radiation systems and two corresponding detection systems. The radiation sources of the two radiation systems are different and are arranged at different positions within the inspection channel, so that the data processing system receives different signals from the detection systems to generate dual-viewing angle detection data. The present invention has the following beneficial effects: the present invention utilizes two different radiation sources, which can provide radiation with relatively suitable energy, capable of performing radiation imaging on objects of different densities, thereby forming imaging effects of two different radiations, facilitating the effective identification of contraband.

Description

Technical Field

[0001] The present invention belongs to the field of safety detection, and in particular relates to a dual-source dual-viewing angle passenger vehicle rapid inspection device. Background Art

[0002] Currently, various public security checkpoints and customs vehicle inspection stations require inspection equipment to conduct security checks on vehicles entering and leaving. Existing inspection equipment primarily consists of a portal frame forming an inspection channel, a radiation source positioned on opposite sides of the portal frame, and a detector array. The radiation source emits radiation of varying energies from two directions toward the vehicle, and the detector array receives the radiation to create radiation imaging, thereby completing a safety inspection of the entire vehicle. However, existing inspection equipment suffers from poor imaging performance and is unable to meet the growing demand for inspections.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] In view of the defects existing in the prior art, the purpose of the present invention is to provide a dual-source, dual-viewing angle passenger car rapid inspection device. This technical solution can realize multi-angle and multi-source detection and has good imaging effect.

[0005] The technical solutions of the present invention are as follows:

[0006] A dual-source, dual-viewing angle passenger vehicle rapid inspection device comprises a frame-type inspection channel, a radiation system, a detection system, and a data processing system. The inspection channel is provided with two radiation systems and two corresponding detection systems. The radiation sources of the two radiation systems are different and are arranged at different positions of the inspection channel so that the data processing system receives different signals from the detection systems to form dual-viewing angle inspection data.

[0007] Furthermore, in the above-mentioned dual-source dual-viewing angle passenger car rapid inspection device, the radiation sources of the two sets of radiation systems are a cesium source and a cobalt source respectively.

[0008] Furthermore, in the above-mentioned dual-source dual-viewing angle passenger car rapid inspection device, the radiation source of one set of radiation systems is installed at the top of the detection channel, and the radiation source of the other set of radiation systems is installed at the side of the detection channel.

[0009] Furthermore, in the above-mentioned dual-source dual-view passenger car rapid inspection device, the radiation system includes a shielding body and a radiation source placed in the shielding body; a slit collimator and a ray beam collimator are provided on the shielding body; and a post-collimation structure is provided at the detection system.

[0010] Furthermore, in the above-mentioned dual-source, dual-view passenger car rapid inspection device, the radiation system also includes a pneumatic mechanism, a shielding shutter mechanism and a fixed base; the shielding body is installed on the fixed base; the shielding shutter mechanism is installed on the shielding body; the pneumatic mechanism drives the shielding shutter mechanism to move so that the shielding shutter gap of the shielding shutter mechanism is aligned with or staggered with the slit of the shielding body.

[0011] Furthermore, in the above-mentioned dual-source, dual-view passenger car rapid inspection device, the radiation source is installed in the shielding body through a radiation source fixing structure; the radiation source fixing structure includes a tapered threaded sleeve, a shielding rod and an anti-theft cover; the interior of the tapered threaded sleeve is a pit with an oblique angle, and the size of the pit matches the size of the radiation source; the tapered threaded sleeve is installed on the shielding rod, and the shielding rod is inserted into the shielding body.

[0012] Furthermore, in the above-mentioned dual-source dual-view passenger car rapid inspection device, the tapered threaded sleeve is provided with a step on the outside; and the shielding rod is provided with a step.

[0013] Furthermore, in the above-mentioned dual-source, dual-viewing angle passenger car rapid inspection device, the detection system is a single-row linear array of cerium-doped gadolinium aluminum gallium garnet crystals coupled with silicon photomultiplier tubes; the detector array used to detect cobalt sources and the detector array used to detect cesium sources have the same end face size but different lengths to detect rays of different energies.

[0014] Furthermore, the above-mentioned dual-source dual-view passenger car rapid inspection device also includes a drag chain mechanism; the drag chain mechanism is arranged through the detection channel to drag the item to be inspected into / out of the detection channel.

[0015] Furthermore, in the above-mentioned dual-source dual-view passenger car rapid inspection device, the drag chain mechanism includes a platform with a conveyor belt passing through the inspection channel; slopes are provided at both ends of the platform to facilitate the up and down movement of items.

[0016] Furthermore, in the above-mentioned dual-source dual-viewing angle passenger car rapid inspection device, a barrier gate is also provided on the platform; shielding plates are provided on both sides of the platform.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention uses two different radiation sources. The dual radiation sources can provide rays with relatively suitable energy, and can perform radiation imaging on objects of different densities, forming imaging effects of two different rays, which is convenient for effectively identifying contraband.

[0019] 2. This invention utilizes a doorframe structure and a dual-viewing mode combining top and side illumination, resulting in a wide radiation source angle (up to 80 degrees). The detector array is located close to the radiation source, reducing blind spots when inspecting tall vehicles. Furthermore, a front collimator and rear shield are added to the rear of the bracket, allowing for installation in any outdoor location, ensuring radiation safety for both personnel and the environment.

[0020] 3. The system adopts a single-row cerium-doped gadolinium aluminum gallium garnet (GAGG:Ce) crystal and a silicon photomultiplier (SiPM) structure. Instead of the current method commonly used in previous inspection equipment, it adopts the gamma photon counting method to directly digitally extract the real-time perspective image of the object, greatly reducing the impact of the radiation source dose on the environment.

[0021] 4. The present invention reduces the radiation environment through three-ray collimator, while improving the signal-to-noise ratio of the detector to the rays and improving the imaging effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the frame-type detection channel in the present invention.

[0023] Figure 2 This is a schematic structural diagram of the dual-source, dual-viewing angle passenger vehicle rapid inspection device of the present invention.

[0024] Figure 3 It is a structural diagram of the ray system in the present invention.

[0025] Figure 4 It is a schematic diagram of the cross-sectional structure of the ray system in the present invention.

[0026] In the above drawings, 1. top beam; 2. cesium source shield; 3. cobalt source detector; 4. column; 5. cesium source detector; 6. cobalt source shield; 7. bottom beam; 8. slope; 9. platform; 10. gate; 11. shielding plate; 12. control box; 13. constant temperature control box; 14. conveyor belt; 15. shielding body; 16. lifting ring; 17. guide rail assembly; 18. shutter; 19. cylinder; 20. cylinder sensor; 21. solenoid valve; 22. position adjustment bolt; 23. fixed base; 24. anti-theft cover; 25. shielding rod; 26. tapered threaded sleeve; 27. radioactive source. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0028] like Figure 2As shown, the present invention provides a dual-source, dual-viewing angle passenger vehicle rapid inspection device, comprising a frame-type inspection channel, a radiographic system, a detection system, and a data processing system. The inspection channel is equipped with two radiographic systems and two corresponding detection systems. The two radiographic systems have different radiation sources and are positioned at different locations within the inspection channel, allowing the data processing system to receive different signals from the detection systems and generate dual-viewing angle inspection data. In this embodiment, the radiation sources of the two radiographic systems are a Class IV cesium source and a Class IV cobalt source, respectively.

[0029] This invention utilizes two different radiation sources. The shielding tank utilizes lead as the primary shielding and collimation element, encased in a stainless steel shell. A pneumatic valve at the front controls the opening and closing of the lead collimator. These dual radiation sources provide radiation with optimal energy levels, enabling imaging of objects of varying densities. This creates two distinct radiation imaging effects, facilitating effective identification of contraband.

[0030] like Figure 1 As shown, the radiation source of one of the radiation systems is mounted on the top of the detection channel, while the radiation source of the other radiation system is mounted to the side of the detection channel. In this embodiment, the cesium source shield 2 is placed on the top beam 1, and the corresponding detector arrays are fixed to the columns 4 and bottom beam 7 respectively. The cobalt source shield 6 is placed on the frame of the column 4, and the corresponding detectors are mounted on the top beam 1 and one of the columns 4.

[0031] This dual-view mode, combining top and side illumination, allows the radiation source to have a wide radiation output angle (up to 80 degrees). The detector array is located close to the radiation source, reducing blind spots in tall vehicles. Furthermore, a front collimator and rear shield are added to the rear of the bracket, allowing installation in any outdoor location, ensuring radiation safety for both personnel and the environment.

[0032] In this embodiment, the radiation system includes a shielding body 15 and a radiation source placed in the shielding body 15; a slit collimator and a ray beam collimator are provided on the shielding body 15; a post-collimation structure is provided at the detection system; through the three-ray collimator, the radiation environment is reduced, and the detection signal-to-noise ratio of the detector to the radiation is improved, thereby improving the imaging effect.

[0033] like Figure 3As shown, the radiation system also includes a pneumatic mechanism, a shielding shutter mechanism, and a fixed base 23. The shielding body 15 is mounted on the fixed base 23, and the fixed base 23 is provided with a position adjustment bolt 22 for fine-tuning the position of the shielding body 15. The shielding shutter mechanism is mounted on the shielding body 15; the pneumatic mechanism drives the shielding shutter mechanism to move so that the shielding shutter gap of the shielding shutter mechanism is aligned with or offset from the slit of the shielding body 15. The radiation source shielding body 15 is integrally cast according to the radiation intensity of the radiation source, and a collimation slit is opened on the front. The shielding body 15 is provided with mounting holes for the shielding rod 25 and the radiation source 27 on the top. A hanging ring 16 is installed on the inclined surface of the shielding body 15, and a set of linear guide rail assemblies 17 are provided on the upper and lower surfaces of the inclined surface to fix the shielding shutter 18 and guide it during the sliding process. The movement of the shielding shutter 18 is achieved by using a three-position, two-way solenoid valve 21 and a cylinder 19 to control the switch of the shielding shutter 18. The movement and positioning of the shielding shutter 18 relies on the cylinder sensor 20. When the solenoid valve 21 is opened and air is inflated into the cylinder 19, the shielding shutter 18 is controlled by the cylinder sensor 20 to open to a certain position. The gap of the shielding shutter 18 is aligned with the gap of the shielding body 15, and the rays are emitted from the gap to start scanning; when the solenoid valve 21 is reversed, it starts to inflate the cylinder 19 in the opposite direction, and the shielding shutter 18 returns to its initial position. The gap of the shielding shutter 18 is completely staggered with the gap of the shielding body 15, blocking the rays to form a shielding effect.

[0034] like Figure 4 As shown, the radiation source 27 is mounted within the shielding body 15 via a radiation source securing structure. The radiation source securing structure includes a tapered threaded sleeve 26, a shielding rod 25, and an anti-theft cover 24. The tapered threaded sleeve 26 has an interior with an angled recess, the dimensions of which match the size of the radiation source 27. The tapered threaded sleeve 26 is mounted on the shielding rod 25, which is inserted into the shielding body 15. The tapered threaded sleeve 26 has a stepped exterior. The shielding rod 25 has stepped exteriors, which serve as a positioning mechanism and also form a maze-like shape, providing radiation shielding.

[0035] In this embodiment, the detection system comprises a single-row linear array of cerium-doped gadolinium aluminum gallium garnet (GAGG) crystals coupled to silicon photomultipliers (SiPMs). The detector arrays for detecting cobalt and cesium sources have identical end faces but differ in length to detect radiation of varying energies. Each detector group is surrounded by an independent collimator. This combination of a single row of cerium-doped gadolinium aluminum gallium garnet (GAGG:Ce) crystals and silicon photomultipliers (SiPMs) eliminates the current method commonly used in previous inspection equipment and instead employs gamma photon counting, directly digitally extracting real-time fluoroscopic images of the object, significantly reducing the environmental impact of the radiation source's dose.

[0036] In this embodiment, the detector array is arranged in a line on a frame-type detection channel. Each detector group is connected to a 32-channel gamma photon signal shaping circuit. After integration, voltage comparison, and shaping, the signal is transmitted to a signal acquisition card for counting and processing. The signal processing results are communicated to the device user's front-end computer, where they communicate with the imaging software installed. The image generation and processing system performs calculations and imaging.

[0037] The image generation and processing system continuously inputs single-photon counting pulses into the front-end computer during the sampling period to generate a raw grayscale image. After background subtraction, the raw grayscale image is generated. Digital equalization and other processing are then performed to generate the final image. This is then processed by the image processing program. This includes edge enhancement, contrast enhancement, and pseudo-coloring. It also includes multi-level, individual processing of any area of interest within the overall image, enabling more detailed observation and analysis.

[0038] The control system of this embodiment adopts an automatic control system to automatically control and monitor the entire process of vehicle inspection. It adopts hierarchical and segmented control, including a main computer, a programmable logic controller (PLC), an infrared radiator, an electromagnet controller for the source tank, a camera, a temperature meter, and a dosimeter. It is mainly used for controlling and recording the vehicle entrance, automatically opening and closing the radiation source shielding bodies 2 and 6, detecting the dose at various parts, controlling the temperature and humidity within the detection frame, and automatically controlling and monitoring the entire process of vehicle inspection to ensure personnel safety and the smooth progress of the inspection work, and the unified coordination of the work of various parts of the system.

[0039] like Figure 2 As shown, the inspection device of the present invention also includes a drag chain mechanism; this drag chain mechanism is installed through the inspection channel to drag the items to be inspected into and out of the inspection channel. The drag chain mechanism includes a platform 9 with a conveyor belt 14 that passes through the inspection channel. Both ends of the platform 9 are provided with ramps 8 to facilitate the loading and unloading of items. The platform 9 is also equipped with a gate 10 and shielding plates 11 on both sides. A constant temperature control box 13 is also installed in the frame-type inspection channel.

[0040] The specific steps for using this device are:

[0041] 1) Power on the device. The detector array (cobalt source detector 3 and cesium source detector 5) and electronic circuitry are in a state of continuous acquisition, signal shaping, and counting. The operator selects "Calibrate" on the front-end computer imaging control software, and the data collected at this time is used as the background count.

[0042] 2) When the vehicle to be inspected passes the ramp 8 and drives onto the platform 9, the gate 10 opens and the conveyor belt 14 starts working, driving the vehicle forward.

[0043] 3) When a vehicle approaches the detector and blocks the infrared light, the shutter of cesium source shield 2 opens. After a 2-second delay, the shutter of cobalt source shield 6 opens. When the detected vehicle completely passes through the detector, the infrared light triggers and the radiation source shutter closes. The imaging software on the front-end computer calculates and generates images based on these different counts. The front-end computer also captures the vehicle's exterior and license plate images transmitted by the camera for backup.

[0044] 4) After the vehicle has passed the bracket as a whole, that is, after the overall scan is completed, the infrared transmitter installed on the other side of the bracket will send another signal to the control box 12, indicating that the vehicle has passed as a whole. After receiving this signal, the control box 12 sends a signal to the electromagnet controller, and the electromagnet controller cuts off the power to the electromagnet. The source device in the shielding tank is reset by the reset spring, and the shielding body is reset and retracted. At this time, no gamma rays are emitted. At the same time, the control box 12 sends a signal to the front-end computer. After receiving the signal, the front-end computer will uniformly package the previously calculated gamma-ray radiographic image and its data and the vehicle appearance license plate image collected from the camera, and store them in the computer's designated folder as the data and image files of this vehicle passing, for future reference. At the same time, the conveyor belt 14 also stops rotating, and the detection is completed.

[0045] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A dual-source dual-viewing angle passenger vehicle rapid inspection device, characterized in that: The system comprises a frame-type detection channel, a radiation system, a detection system, and a data processing system; the detection channel is provided with two radiation systems and two corresponding detection systems; the radiation sources of the two radiation systems are different and are arranged at different positions in the detection channel so that the data processing system receives different signals from the detection systems to form dual-view detection data. The radiation source of one radiation system is installed at the top of the detection channel, and the radiation source of the other radiation system is installed at the side of the detection channel. A dual-view mode combining top and side illumination is adopted, so that the radiation output angle of the radiation source reaches 80 degrees; The radiation sources of the two radiation systems are cesium and cobalt sources, respectively. When a vehicle approaches the detector and blocks the infrared photoelectric device, the cesium source shield shutter opens. After a delay of 2 seconds, the cobalt source shield shutter opens. When the detected vehicle completely passes through the detector, the infrared photoelectric device is triggered, and the radiation source shutter closes. The detection system is a single-row linear array of cerium-doped gadolinium aluminum gallium garnet crystals coupled with silicon photomultiplier tubes. It uses gamma photon counting to directly digitally extract real-time perspective images of objects. The detector arrays used to detect the cobalt source and the detector arrays used to detect the cesium source have the same end face size but different lengths to detect radiation of different energies. Using two different radiation sources, objects of different densities are imaged by radiation, creating imaging effects of two different radiation types. Each detector array is connected to a 32-channel gamma photon signal shaping circuit. After integration, voltage comparison and shaping, the signal is transmitted to the signal acquisition card for signal counting and processing; the signal processing results are communicated to the front-end computer of the equipment user, and communicated with the image software in the front-end computer, and the image generation and processing system performs calculations and imaging; the image generation and processing system continuously inputs the single-photon counting pulses into the front-end computer within the sampling period to generate the original grayscale image. The original grayscale image generated by subtracting the background is then digitally equalized to generate the formal image, which is then processed by the image processing program.

2. The dual-source dual-viewing passenger vehicle rapid inspection device according to claim 1, characterized in that: The ray system comprises a shielding body and a radiation source placed in the shielding body; a slit collimator and a ray beam collimator are arranged on the shielding body; and a post-collimation structure is arranged at the detection system.

3. The dual-source dual-viewing passenger vehicle rapid inspection device according to claim 2, characterized in that: The radiation system also includes a pneumatic mechanism, a shielding shutter mechanism and a fixed base; the shielding body is installed on the fixed base; the shielding shutter mechanism is installed on the shielding body; the pneumatic mechanism drives the shielding shutter mechanism to move so that the shielding shutter gap of the shielding shutter mechanism is aligned with or staggered with the slit of the shielding body.

4. The dual-source dual-viewing passenger vehicle rapid inspection device according to claim 2, characterized in that: The radioactive source is installed in the shielding body through a radioactive source fixing structure; the radioactive source fixing structure includes a tapered threaded sleeve, a shielding rod and an anti-theft cover; the interior of the tapered threaded sleeve is a pit with an oblique angle, and the size of the pit matches the size of the radioactive source; the tapered threaded sleeve is installed on the shielding rod, and the shielding rod is inserted into the shielding body.

5. The dual-source dual-viewing angle passenger vehicle rapid inspection device according to claim 4, characterized in that: The tapered threaded sleeve is provided with a step on the outside; the shielding rod is provided with a step.

6. The dual-source, dual-viewing angle passenger vehicle rapid inspection device according to any one of claims 1 to 5, characterized in that: It also includes a drag chain mechanism; the drag chain mechanism is arranged through the detection channel to drag the item to be detected into / out of the detection channel.

7. The dual-source dual-viewing angle passenger vehicle rapid inspection device according to claim 6, characterized in that: The drag chain mechanism includes a platform with a conveyor belt passing through the detection channel; slopes are provided at both ends of the platform to facilitate the up and down movement of items.

8. The dual-source dual-viewing angle passenger vehicle rapid inspection device according to claim 7, characterized in that: The platform is also provided with a barrier gate; shielding plates are provided on both sides of the platform.

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