Self-adaptive vehicle cold cathode X-ray detection control method, system, equipment and product

Abstract

The embodiment of the invention relates to the technical field of vehicle security check, and discloses a self-adaptive vehicle cold cathode X-ray detection control method, system, device and product, and the method comprises the steps: obtaining the external contour data of a to-be-detected vehicle collected by a three-axis measurement device when the to-be-detected vehicle enters a detection region, the external contour data at least comprises the vehicle terrain clearance; identifying the vehicle type of the to-be-detected vehicle according to the external contour data of the to-be-detected vehicle; according to the identified vehicle type, the voltage grade of an X-ray source is matched, and different vehicle types correspond to different bias voltage modes; according to the method, the starting time of the X-ray source is determined, the X-ray source is driven to emit beams according to the matched voltage level in response to the starting time, and the to-be-inspected vehicle is scanned, so that the intelligent level of vehicle security inspection is remarkably improved through refined three-axis measurement and hierarchical voltage control.

Description

Technical Field

[0001] This application relates to the field of vehicle safety inspection technology, and in particular to an adaptive vehicle cold cathode X-ray detection control method, system, equipment and product. Background Technology

[0002] With increasing security demands, non-invasive vehicle inspection systems based on X-ray imaging technology have been widely used at customs and important facility entrances to replace inefficient manual inspections, becoming the mainstream vehicle security inspection method.

[0003] However, existing vehicle X-ray inspection systems still have many limitations in practical applications. First, traditional inspection systems mostly use X-ray beams with fixed angles and heights, lacking flexible mechanical avoidance mechanisms. Due to the diverse types of vehicles and the significant differences in driver positions, fixed avoidance strategies cannot achieve full coverage scanning of cargo in the vehicle compartment while ensuring driver radiation safety, easily leading to missed cargo inspections or accidental injury to personnel. Second, existing systems typically use X-ray sources of a single voltage level, unable to automatically adjust penetration parameters according to vehicle type. This results in unnecessary radiation and energy consumption when inspecting light vehicles, while insufficient penetration and poor imaging quality are difficult to achieve when inspecting heavy vehicles.

[0004] In addition, existing control systems often ignore the physical start-up delay of the cold cathode X-ray source and the influence of vehicle speed, resulting in a deviation between the actual beam position and the expected position after the trigger signal is issued, making it impossible to achieve precise scanning control. Summary of the Invention

[0005] One objective of this application is to provide an adaptive vehicle cold cathode X-ray inspection control method, system, device, and product, which at least solves the technical problem that existing vehicle X-ray inspection systems, when dealing with complex traffic flows, cannot simultaneously achieve both radiation safety and inspection effectiveness due to the lack of an adaptive adjustment mechanism.

[0006] To achieve the above objectives, some embodiments of this application provide the following aspects:

[0007] This application provides an adaptive vehicle cold cathode X-ray detection control method, the method comprising:

[0008] When the vehicle to be inspected enters the inspection area, the external contour data of the vehicle to be inspected is acquired by a triaxial measuring device, and the external contour data includes at least the vehicle's height off the ground.

[0009] The vehicle type of the vehicle to be inspected is identified based on the external contour data of the vehicle to be inspected;

[0010] Based on the identified vehicle type, the voltage level of the X-ray source is matched, wherein different vehicle types correspond to different bias voltage modes;

[0011] Determine the timing for turning on the X-ray source, and in response to the timing, drive the X-ray source to emit a beam according to the matched voltage level to scan the vehicle to be inspected.

[0012] Secondly, some embodiments of this application also provide an adaptive vehicle cold cathode X-ray detection and control system, the system comprising:

[0013] A three-axis measuring device is installed at the entrance of the inspection channel to collect external contour data of the vehicle to be inspected, and includes a driver positioning system.

[0014] The sensor assembly includes a height sensor and multiple position sensors arranged along the driving direction for detecting the vehicle's position.

[0015] A cold cathode X-ray source is used to emit X-rays to scan vehicles;

[0016] A receiving column is disposed on the side of the detection channel opposite to the cold cathode X-ray source, and cooperates with the cold cathode X-ray source to receive X-ray signals after penetrating the vehicle;

[0017] The control system is connected to the triaxial measuring device, the sensor assembly, and the cold cathode X-ray source, respectively.

[0018] The control system is used to receive the external contour data and identify the vehicle type; according to the identified vehicle type, the voltage level of the X-ray source is matched, wherein different vehicle types correspond to different bias voltage modes;

[0019] The control system is also used to determine when the X-ray source is turned on, and in response to the turning on timing, drive the X-ray source to emit a beam according to the matched voltage level to scan the vehicle to be inspected.

[0020] Thirdly, some embodiments of this application also provide an electronic device, the electronic device comprising: one or more processors; and a memory storing computer program instructions, which, when executed, cause the processor to perform the steps of the method described above.

[0021] Fourthly, some embodiments of this application also provide a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the method described above.

[0022] Compared with related technologies, the solution provided in this application, by introducing triaxial measurement and control logic, achieves a perfect balance between radiation safety, imaging quality, and control precision during vehicle security inspections. It can automatically distinguish between cars, buses, and trucks based on vehicle contours and match the voltage level of the X-ray source, correspondingly switching between negative bias, rated, or positive bias voltage modes. This design not only significantly reduces the radiation dose to light vehicles, achieving energy conservation and environmental protection, but also ensures high penetration for heavy vehicles, guaranteeing imaging clarity in mixed traffic flow. Furthermore, based on real-time measured vehicle ground clearance, it calculates and drives the movement of the shading mechanism, achieving mechanical obstacle avoidance. This adaptive shading mechanism, while ensuring avoidance of the driver, minimizes the initial X-ray height and effectively covers the cargo at the bottom of the vehicle compartment. Attached Figure Description

[0023] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0024] Figure 1 A flowchart of an adaptive vehicle cold cathode X-ray detection control method provided as an exemplary embodiment of this disclosure;

[0025] Figure 2 A schematic diagram illustrating the driver's position positioning in the vehicle cab of an adaptive vehicle cold cathode X-ray detection control method provided as an exemplary embodiment of this disclosure;

[0026] Figure 3 A schematic diagram illustrating the measurement of external contour data of a vehicle under test using a triaxial measuring device in an adaptive vehicle cold cathode X-ray inspection control method provided as an exemplary embodiment of this disclosure;

[0027] Figure 4 A schematic plan view of a cold cathode X-ray device in an adaptive vehicle cold cathode X-ray detection control method provided as an exemplary embodiment of this disclosure;

[0028] Figure 5 A vertical plane schematic diagram of a security inspection system in an adaptive vehicle cold cathode X-ray detection control method provided as an exemplary embodiment of this disclosure;

[0029] Figure 6 A planar schematic diagram of controlling the X-ray beam exit angle in another adaptive vehicle cold cathode X-ray detection control method provided for an exemplary embodiment of this disclosure;

[0030] Figure 7A schematic plan view of a security inspection system in an adaptive vehicle cold cathode X-ray detection control method provided as an exemplary embodiment of this disclosure;

[0031] Figure 8 A schematic diagram of the framework of an adaptive vehicle cold cathode X-ray detection control system provided for an exemplary embodiment of this disclosure;

[0032] Figure 9 A plan view of an adaptive vehicle cold cathode X-ray detection control system provided as an exemplary embodiment of this disclosure;

[0033] Figure 10 An exemplary structural diagram of the electronic device provided for some embodiments of this application. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] Figure 1 A flowchart of an adaptive vehicle cold cathode X-ray detection control method provided as an exemplary embodiment of this disclosure, the method comprising:

[0036] S101. When the vehicle to be inspected enters the inspection area, the external contour data of the vehicle to be inspected is acquired by the triaxial measuring device, and the external contour data includes at least the vehicle's height above the ground.

[0037] S102. Identify the vehicle type of the vehicle to be inspected based on the external contour data of the vehicle to be inspected;

[0038] S103. Match the voltage level of the X-ray source according to the identified vehicle type, wherein different vehicle types correspond to different bias voltage modes;

[0039] S104. Determine the activation timing of the X-ray source, and in response to the activation timing, drive the X-ray source to emit a beam according to the matched voltage level to scan the vehicle to be inspected.

[0040] Specifically, when a vehicle to be inspected enters the entrance area of ​​the inspection lane, the triaxial measuring device is first activated to perform a full-range external contour scan of the vehicle. Secondly, the driver positioning system determines the distance between the driver and the front of the vehicle (e.g., ...). Figure 2This device acquires real-time three-dimensional spatial data of the vehicle through integrated sensor components (such as gratings or lidar, etc.). Figure 3 The system focuses on collecting the vehicle's precise ground clearance, while also including information on the vehicle's length and width, to construct a digital outline model of the vehicle under inspection and the driver's position. After receiving the above data, the control system executes a real-time analysis algorithm, comparing the collected outline data with a pre-set database of typical vehicle features to accurately determine the specific category of the vehicle (e.g., a low-profile sedan, a van / medium-sized truck with a moderate height, or a high-profile freight truck with high cargo density).

[0041] After vehicle type recognition, the control system immediately and automatically adjusts the operating parameters of the cold cathode X-ray source according to the vehicle type, achieving adaptive voltage level matching. The system has a pre-set hierarchical control strategy, with different bias voltage modes corresponding to different vehicle types. After configuring the voltage parameters, the system calculates the optimal activation timing of the X-ray source based on the vehicle's real-time position, speed, and the driver's safety avoidance requirements. When the vehicle is detected to have reached a trigger position that meets safety requirements, the system immediately responds to this activation timing, driving the cold cathode X-ray source to stably emit a beam at the pre-matched voltage level, accurately scanning and detecting the cargo area of ​​the vehicle under inspection until the scan is complete.

[0042] In this embodiment, refined triaxial measurement and graded voltage control significantly improve the intelligence level of vehicle security inspection. By constructing a digital contour model for vehicle model recognition, errors from manual operation are avoided. Furthermore, based on a vehicle model-adaptive voltage matching mechanism, different voltages are applied to different vehicles, effectively ensuring image clarity, preventing missed detections due to insufficient penetration, and reducing radiation dose. Responsive triggering based on safe timing ensures efficient cargo inspection while protecting the driver's radiation safety.

[0043] In one embodiment, the step of matching the voltage level of the X-ray source according to the identified vehicle type specifically includes:

[0044] If the vehicle type is determined to be a sedan, a negative bias voltage mode is matched to reduce the radiation dose;

[0045] If the vehicle type is determined to be a van or a medium-sized truck, then the rated voltage mode is matched;

[0046] If the vehicle type is determined to be a freight truck, a positive bias voltage mode is matched to improve penetration.

[0047] Specifically, after vehicle type identification is completed based on external contour data, a preset voltage adjustment strategy is immediately invoked to configure the parameters of the cold cathode X-ray source. If the vehicle under inspection is determined to be a sedan, given its thinner body panels and lighter overall structure, the X-ray source's operating mode is switched to negative bias voltage mode (i.e., below the standard rated voltage), thereby reducing the emission power. If the vehicle is determined to be a van or medium-sized truck, the X-ray source is controlled to operate in rated voltage mode to maintain standard detection benchmarks. If the vehicle is determined to be a freight truck, considering its thick cargo box structure and potential high-density cargo load, the control system automatically switches to positive bias voltage mode (i.e., above the standard rated voltage) to output a higher-energy X-ray beam.

[0048] In this embodiment, a graded voltage control strategy for different vehicles effectively solves the adaptability problem of a single voltage mode when facing complex traffic flow. Using negative bias voltage for passenger cars not only saves equipment energy but, more importantly, significantly reduces the radiation dose to the surrounding environment and the vehicle itself. Conversely, using positive bias voltage for freight trucks significantly enhances the penetrating power of the radiation, ensuring imaging quality under high-density obstruction and effectively avoiding image blurring or missed cargo detection due to insufficient radiation energy.

[0049] Furthermore, in one embodiment, a standard rated voltage reference value for the cold cathode X-ray source is set to dKV (kilovolts). Based on this reference value, a quantized voltage regulation gradient is preset:

[0050] When the vehicle is determined to be a van or a medium-sized truck, the rated voltage dKV is directly used for scanning.

[0051] When it is determined that a freight truck requires higher penetration, the working voltage is increased to a positive bias voltage value, specifically (d+30)KV;

[0052] When a car is determined to require low-dose detection, the operating voltage is reduced to a negative bias voltage value, specifically (d-30)KV.

[0053] Specifically, the aforementioned baseline value d and offset amplitude (30KV) are not fixed and can be flexibly set by technicians according to the actual security inspection level requirements or the specific specifications of the X-ray tube. Furthermore, it allows for optimized configuration of the overall system simply by adjusting the baseline value d in different application scenarios (such as customs requiring high penetration and residential areas requiring low radiation), or setting the default value to (d-30)KV to adapt to situations where there are many cars and few other vehicles in a residential area, without needing to rewrite the control algorithm.

[0054] The beneficial effect of this embodiment is that it provides a parameterized and quantifiable voltage control standard. By setting the mathematical relationship between the reference value d and the fixed bias (±30KV), the logical operation complexity of the control system is simplified, enabling the system to switch quickly and stably between different modes.

[0055] In one embodiment, the X-ray source is configured with a movable light-shielding mechanism, and the method further includes:

[0056] Based on the vehicle's ground clearance, the lane width of the detection channel, and the preset beam angle parameters of the X-ray source, calculate the downward shading distance that the shading mechanism needs to move.

[0057] Before the X-ray source emits its beam, the light-shielding mechanism is driven to move downward by the light-shielding distance, thereby adjusting the irradiation range of the X-ray beam.

[0058] Specifically, such as Figure 4 As shown, the cold cathode X-ray source's emission box assembly is specially equipped with a vertically movable shielding mechanism and a corresponding precision drive device. After acquiring the ground clearance data of the vehicle to be inspected, this data is combined with the inherent lane width parameters of the inspection channel and the preset initial beam exit angle parameters of the X-ray source. A geometric algorithm is used to calculate in real time the shielding distance that the shielding mechanism needs to be adjusted downwards. Before the X-ray source officially starts emitting the beam, the control system, based on the calculated distance parameters, first controls the drive device to move the shielding mechanism downwards to the target position, thereby physically cutting and adjusting the vertical sector of the X-ray beam and limiting the highest irradiation boundary of the rays.

[0059] In this embodiment, the upper limit of the X-ray beam can be precisely adjusted according to the actual height of each vehicle. This design ensures that the X-rays absolutely avoid the driver's position while minimizing the starting height of the rays, enabling the system to effectively scan the cargo area below the cab or immediately behind the front of the vehicle. This greatly reduces blind spots and achieves dual protection against radiation and comprehensive detection.

[0060] In one embodiment, the shading distance is calculated as follows:

[0061] Using the horizontal line where the X-ray source focal point is located as a reference, calculate the beam exit angle of the vehicle's top edge relative to the horizontal line. It satisfies the formula:

[0062]

[0063] Where H is the vehicle's height off the ground, h is the vertical distance between the X-ray source focal point and the ground, m is the lane width, and W is the width of the vehicle to be measured.

[0064] Based on the initial preset beam exit angle β and the calculated beam exit angle Calculate the light-shielding distance L5 of the light-shielding mechanism inside the launch box:

[0065]

[0066] Where D is the horizontal distance from the X-ray source focal point to the plane of the light-shielding mechanism.

[0067] Specifically, such as Figure 5 and Figure 6 As shown, a geometric calculation model is first established with the X-ray source focus as the origin. Assuming the vehicle travels along the lane centerline, the lane width *m* is obtained, and half of this width, *m / 2*, is taken as the horizontal projection distance. A triaxial measuring device obtains the width (*W*) of the vehicle under inspection, and half of this width, *W / 2*, is taken as the horizontal projection distance. Simultaneously, the vehicle's ground clearance *H* and the fixed vertical distance *h* of the X-ray source focus relative to the ground are read in real time. Based on these parameters, the beam exit angle of the vehicle's top edge relative to the horizontal line of the X-ray source focus is calculated. This angle satisfies the geometric formula. ,in This represents the height difference between the top of the vehicle and the radiation source; This represents the distance between the side of the vehicle and the X-ray source when the vehicle is traveling along the center line of the lane.

[0068] After determining the target angle suitable for the current vehicle Then, displacement calculations were performed based on the internal structural parameters of the X-ray emission box. The horizontal distance D from the X-ray source focal point to the plane of the shielding mechanism is known, and the system's preset initial maximum beam angle is β. Based on the tangent trigonometric function relationship, the downward shielding distance L5 that the shielding mechanism needs to move inside the emission box is calculated. The specific calculation formula is as follows: After the calculation is completed, the L5 value is converted into a pulse signal to drive the motor, controlling the light-shielding plate to move precisely to the designated position.

[0069] In this embodiment, by introducing The height difference calculation system can eliminate parallax caused by changes in vehicle height or different installation heights of the radiation source, ensuring the calculated angle is accurate. It can accurately point to the edge of the vehicle's top. At the same time, by directly deriving the mechanical displacement L5 using the tangent difference formula, the complex spatial avoidance problem is transformed into a simple linear drive control. This not only has low computational load and fast response speed, but also achieves millimeter-level shading accuracy, thereby maximizing the effective scanning area of ​​other parts of the vehicle body while absolutely ensuring driver safety.

[0070] In one embodiment, the detection area is equipped with a height sensor and a sensor array consisting of multiple position sensors along the driving direction; determining the activation timing of the X-ray source specifically includes:

[0071] Obtain the driver's position inside the vehicle and calculate the safe lag distance based on preset deflection angle parameters to generate a cab wireframe diagram length that includes the driver's position;

[0072] Obtain the real-time vehicle speed (V) and the X-ray source start-up delay time (t) of the vehicle to be inspected; calculate the delay compensation distance traveled by the vehicle during the period from X-ray source start-up to beam exit. ;

[0073] Calculate the position sensor number (N) used to trigger the activation signal; the formula for calculating the number (N) satisfies:

[0074]

[0075] Where L is the length of the cab wireframe diagram, L3 is the distance between the height sensor and the position sensor, and L6 is the spacing between individual position sensors.

[0076] Specifically, along the vehicle's direction of travel, height sensors and a sensor array consisting of multiple equally spaced position sensors are sequentially arranged in the detection area. First, the driver's position inside the cab is determined using a driver positioning system. Then, based on the preset deflection angle parameters of the X-ray source, a safe lag distance (L1) is calculated to ensure that the X-ray does not hit the driver. This safe lag distance (L1) is added to the driver's position inside the cab (L2) to obtain the length (L) of the cab's wireframe diagram.

[0077]

[0078] Subsequently, the vehicle's speed V under inspection is acquired in real time, and the inherent start-up delay time t of the cold cathode X-ray source (i.e., the time difference from power-on to actual beam output) is read. The delay compensation distance L4 for the vehicle's continued travel during this delay time period is calculated using the following formula: .

[0079] Based on this, in a preferred configuration of this embodiment, the physical distance L3 between the height sensor and the starting end of the position sensor array is set to the sum of the safety hysteresis distance L1 and the delay compensation distance L4, i.e., taken as... This setting helps optimize the initial coverage area of ​​the sensor array, making the triggering calculations more reasonable.

[0080] To determine the specific physical trigger point, the target position sensor number N for triggering the activation signal is calculated by combining the physical distance L3 between the height sensor and the starting end of the position sensor array, and the spacing L6 between individual position sensors. This number satisfies the formula... When the front of the vehicle actually triggers the Nth position sensor, the control system immediately issues an activation command.

[0081] In this embodiment, by calculating the delay compensation distance L4 and incorporating it into the trigger formula, the system effectively performs a "lead time" control, effectively offsetting the beam lag caused by the start-up delay of the cold cathode X-ray source. This ensures that the X-ray beam can be accurately emitted the instant after the driver's safe zone has passed, absolutely avoiding accidental scanning of the driver and eliminating the blind spot for scanning cargo behind the vehicle caused by slow equipment response, achieving millimeter-level precise trigger control.

[0082] Furthermore, in one embodiment, the calculation logic for the safety hysteresis distance (L1) is as follows:

[0083] The width (W) of the vehicle to be inspected, the lateral distance (U) between the edge of the vehicle and the X-ray source emission box, and the deflection angle (θ) of the X-ray source relative to the direction perpendicular to the lane are obtained.

[0084] According to the formula Calculate the safety hysteresis distance (L1):

[0085] Specifically, such as Figure 7 As shown, since cold cathode X-ray sources are typically installed with a deflection angle θ perpendicular to the lane direction, a geometric compensation distance, i.e., a safety lag distance L1, must be calculated to prevent the X-ray beam from entering the cab at an angle before the driver has completely left the lane. This distance depends not only on the width W of the cab itself but also on the lateral distance U between the vehicle and the transmitter box while the vehicle is traveling within the lane. According to trigonometric relationships, the longitudinal distance required for the X-ray beam to completely cross the full lateral width of the vehicle (i.e., W+U) satisfies the formula... Therefore, the control system uses a triaxial measuring device to obtain the vehicle's width W and lateral position U in real time, and combines this with a fixed deflection angle θ, using the formula... The required lag distance for the current vehicle is accurately calculated. Finally, this distance is superimposed on the driver's position L2 to generate the final cab wireframe length L.

[0086] This embodiment provides a dynamic safety model that fully considers the lateral movement of the vehicle. In actual security inspection scenarios, vehicles often cannot strictly maintain a straight line at the center or edge of the lane, and the lateral distance U will dynamically change. By incorporating the variable U into the calculation formula, it is ensured that a safe lag distance sufficient to cover the entire width of the vehicle can be calculated regardless of whether the vehicle is far or near the emission source. This eliminates the risk of rays obliquely entering the far end of the driver's cab due to the vehicle driving too far out, achieving high-precision all-round radiation protection.

[0087] Furthermore, in one embodiment, considering practical applications and to further ensure driver safety, the distance U between the vehicle edge and the launch box is set to zero (i.e., U=0). In this case, the above calculation formula simplifies to... .

[0088] Specifically, a maximum safety redundancy baseline was constructed using the limit condition of U=0. This means that regardless of whether the vehicle under inspection is driving on the left, in the center, or on the right, the calculated safety distance can always cover all potential risks, ensuring that the X-ray beam is only activated after the driver's cab is completely out of the irradiation range, greatly improving the system's radiation protection level.

[0089] Furthermore, in one embodiment, the method further includes determining the timing for shutting down the X-ray source:

[0090] When the rear of the vehicle under inspection is detected to be away from the height sensor, the control system obtains the fixed horizontal distance (L7) between the height sensor and the X-ray source and the real-time speed (V) of the vehicle under inspection.

[0091] Calculate the shutdown delay time (T) of the X-ray source, which satisfies the formula:

[0092]

[0093] When the time it takes for the rear of the vehicle to leave the height sensor reaches the shut-off delay time (T), the control system drives the X-ray source to stop emitting beams.

[0094] Specifically, in the physical layout of the detection system, the height sensor is typically installed in front of the X-ray emission box (upstream along the driving direction), with a fixed physical installation distance between them, defined as L7. When the rear of the vehicle being inspected passes the height sensor, although the vehicle has moved out of the sensor's sensing range, the rear of the vehicle is still actually within the X-ray emission box's irradiation area and has not yet been scanned. To ensure scan integrity and avoid unnecessary radiation discharge, the control system implements a distance-speed conversion-based delayed shutdown strategy. Once the height sensor signal changes from "vehicle present" to "vehicle absent" (i.e., the rear of the vehicle has been detected to have left), the system immediately starts a timing program and calculates the time T required for the vehicle to travel the distance L7 based on the current real-time vehicle speed V. The calculation formula is... The system keeps the X-ray source on for a duration of T, ensuring that the X-ray source is precisely shut off the instant the rear of the vehicle completely passes through the X-ray beam plane.

[0095] The beneficial effect of this embodiment is that by accurately calculating the relationship between physical distance and vehicle speed, millisecond-level control of the X-ray source shutdown timing is achieved. This not only ensures that the rear of the vehicle (usually an area where items can be easily hidden) can be completely scanned, preventing missed detections; at the same time, once the rear of the vehicle leaves the X-ray area, the system immediately cuts off the X-rays, minimizing ineffective X-ray irradiation of the open area behind the vehicle, reducing residual environmental radiation, and extending the service life of the cold cathode ray tube.

[0096] Figure 8 An adaptive vehicle cold cathode X-ray detection control system provided as an exemplary embodiment of this disclosure includes:

[0097] The triaxial measuring device 1 is set at the entrance of the inspection channel to collect the external contour data of the vehicle to be inspected, and includes a driver positioning system.

[0098] Sensor assembly 2 includes a height sensor and multiple position sensors arranged along the driving direction for detecting vehicle position;

[0099] Cold cathode X-ray source 3 is used to emit X-rays to scan the vehicle;

[0100] The receiving column 4 is located on the side of the detection channel opposite to the cold cathode X-ray source, and cooperates with the cold cathode X-ray source to receive the X-ray signal after penetrating the vehicle.

[0101] The control system 5 is connected to the triaxial measuring device, the sensor assembly, and the cold cathode X-ray source, respectively.

[0102] The control system 5 is used to receive the external contour data and identify the vehicle type; according to the identified vehicle type, the voltage level of the X-ray source is matched, wherein different vehicle types correspond to different bias voltage modes;

[0103] The control system 5 is also used to determine the timing of the X-ray source activation, and in response to the activation timing, drive the X-ray source to emit a beam according to the matched voltage level to scan the vehicle to be inspected.

[0104] Specifically, the system mainly consists of a triaxial measuring device, sensor components, a cold cathode X-ray source emission subsystem, a receiving column, and a central control system. All parts work together to achieve accurate vehicle security inspection.

[0105] First, the triaxial measuring device can be deployed at the entrance of the inspection channel. It not only includes X-axis, Y-axis, and Z-axis reference plane sensors for constructing the vehicle's three-dimensional coordinates, but also integrates a driver positioning system that can accurately capture the driver's physical position inside the front of the vehicle when it is stopped or slowly passing through. To ensure the integrity of the measurement, the device is also equipped with a lever lifter, whose stop lever is typically more than 50cm away from the measurement reference plane (L8), forcing the vehicle to complete a full contour scan before entering the core inspection area, thereby obtaining external contour data including vehicle length, width, and precise ground clearance.

[0106] Adjacent to the measurement area, the sensor assembly extends along the driving direction, including a height sensor for secondary confirmation of vehicle positioning, and a position sensor array consisting of multiple equally spaced (L6) gratings or physical switches. A fixed physical distance (L3) is maintained between the height sensor and the starting end of the position sensor array; these hardware parameters serve as the physical reference for the subsequent control system to calculate precise triggering timing.

[0107] The core detection mechanism consists of a cold cathode X-ray source and its associated emission chamber. The emission chamber has a sophisticated internal structure, integrating a temperature and humidity control system to maintain the equipment's operating environment, and is encased in a lead shielding shell to prevent radiation leakage.

[0108] Opposite the transmitter is the receiver column installed on the other side of the safety island. To accommodate civil engineering errors at different sites, the receiver column's base is designed to be highly adjustable. The receiver column base can be designed to sink into the safety island or below ground level to ensure absolute horizontal alignment between the detector array and the focal point of the transmitter source.

[0109] Finally, the control system, acting as the central nervous system of the entire architecture, is electrically connected to all the aforementioned devices. On one hand, it identifies the vehicle type based on triaxial measurement data and automatically switches the operating voltage of the X-ray source between negative bias voltage (for passenger cars), rated voltage (for mid-sized vehicles), and positive bias voltage (for trucks). On the other hand, it combines real-time vehicle speed, equipment startup delay (t), and sensor array layout to calculate a precise trigger sequence number (N) and drives the X-ray source to emit a beam in response to this trigger timing. Through this deep coupling of hardware and software, the system achieves fully automated closed-loop control from measurement, identification, parameter matching to precise execution.

[0110] In one embodiment, a light-shielding mechanism and a driving device are also provided at the beam exit of the cold cathode X-ray source;

[0111] The control system is also used to calculate the shading adjustment value based on the vehicle's height data, and control the drive device to move the shading mechanism to change the irradiation range of the X-ray beam.

[0112] Specifically, the X-ray source outlet inside the emission box is equipped with a movable shielding mechanism and a precision drive device. This drive device is controlled by the control system and can drive the shielding plate to make slight adjustments in the vertical direction based on the shielding distance (L5) calculated according to the vehicle height. This physically changes the starting angle of the X-ray beam fan, thereby achieving mechanical avoidance of the driver's head.

[0113] In one embodiment, the system further includes a vehicle direction sensing device;

[0114] The driving direction mutual inductance device includes a first ground inductor coil and a second ground inductor coil arranged along the driving direction.

[0115] The control system determines whether the vehicle is moving forward or backward by monitoring the changes in the sensing states of the first and second inductive loops.

[0116] When the system determines that the vehicle is moving forward, it controls the cold cathode X-ray source to be turned on.

[0117] Specifically, adjacent to the measurement area, the system deploys a vehicle direction inductance device and sensor components along the driving direction. The vehicle direction inductance device consists of a first inductive loop and a second inductive loop buried underground. The control system intelligently determines the vehicle's motion state by analyzing the real-time changes in the sensing states of these two loops: for example, when the sensing sequence shows a change of "(1,0)-(1,1)-(0,1)-(0,0)", the system determines that the vehicle is moving forward and allows the X-ray to be triggered; conversely, if it is a reversing sequence, the X-ray source is prohibited from being activated to prevent false triggering.

[0118] Furthermore, in one embodiment, to accommodate different site conditions and construction errors, the base of the receiving column is designed to be adjustable. The receiving column is positioned opposite the cold cathode X-ray source on safety islands on both sides of the detection channel; the installation height (Y2) of the receiving column base is determined according to the following steps:

[0119] Based on the lane width (m) of the detection channel and the preset horizontal downward beam angle (α) of the X-ray source, the effective coverage distance (a) of the receiving column detector is calculated, satisfying the formula: a=m×tanα;

[0120] Based on the vertical distance (n) between the X-ray source focal point and the bottom of the safety island, the height of the safety island (Y1), and the effective coverage distance (a), the base height (Y2) of the receiving column is calculated, satisfying the formula: ;

[0121] If the calculated base height (Y2) is negative, the base of the receiving column will be lowered and installed inside the safety island (even below ground level); if the base height (Y2) is positive, the base height of the receiving column will be the height above the surface of the safety island.

[0122] Specifically, the system-defined installation geometry parameters include: the height of the safety island Y1 (usually fixed at 20cm), the height of the receiver base (i.e., the part without detector support) Y2, the total vertical distance n from the X-ray tube focal point to the bottom of the safety island, the lane width m (generally 3.5-4 meters), and the effective receiving distance a of the detector. In addition, angular parameters include the downward beam emission angle α (10°-20°), the upward beam emission angle β (50°-60°), and the deflection angle θ of the transmitter box relative to the perpendicular lane direction (10°-20°). To ensure that the lower edge of the X-ray beam accurately passes under the vehicle tires and is received by the detector, the system first calculates the effective coverage distance a of the detector based on geometric trigonometric relationships. Since the ratio of the effective detector distance to the lane width is equal to the tangent of the downward angle (i.e., a / m=tanα), it can be derived that a=m×tanα.

[0123] After determining parameter 'a', the system further calculates the installation height Y2 of the receiving column base. Based on the vertical height closed-loop relationship, the sum of the detector's effective distance, the safety island height, and the receiving column base height should equal the total height of the X-ray source focal point (i.e.,...). From this deformation, we can obtain the formula for calculating the height of the base: In practical engineering design, considering that the minimum tire diameter of a passenger car is approximately 80cm, parameters a and n need to be within a certain range to ensure coverage. However, since the height Y1 of the safety island is usually a fixed civil engineering parameter, the calculated Y2 is very likely to be a negative number.

[0124] For the special case where Y2 is negative (i.e., when the calculated result Y2 < 0), it indicates that conventional installation would result in the receiver being too high and unable to receive the bottom rays. Therefore, the receiver base must be lowered for installation. If Y2 is negative and its absolute value is less than Y1, the base is lowered and installed inside the concrete structure of the safety island. If the absolute value of Y2 is greater than Y1, it indicates that even if the safety island is excavated, the depth is still insufficient. In this case, the base needs to be further lowered and installed below the ground level (foundation). In addition, the system also references other auxiliary distance parameters, such as the distance L3 between the height sensor and the position sensor, and the distance L7 between the height sensor and the transmitter box, to ensure the overall layout coordination.

[0125] In this embodiment, through the formula Pre-calculation allows engineers to anticipate installation risks before equipment arrives on site. In particular, the quantitative design for "base sinking" ensures that no matter how high the safety island is or how wide the lane is, the detector at the receiving end can maintain perfect geometric alignment with the X-ray source at the transmitting end, eliminating blind spots in vehicle bottom scanning caused by installation height errors (i.e., preventing missed detection of contraband hidden near the chassis), while also avoiding project delays caused by repeated on-site cutting and debugging.

[0126] The following example illustrates the workflow of this system:

[0127] like Figure 9 As shown, when the vehicle to be inspected enters the safety island area of ​​the inspection channel, the lifting lever at the front of the triaxial measuring device is in the lowered state, guiding the vehicle to slowly decelerate and stop in the designated area marked on the ground. During the vehicle's stop or low-speed coasting, the triaxial measuring device starts scanning, precisely measuring the vehicle's X, Y, and Z dimensions to obtain the vehicle's front length (L), width (W), and ground clearance (H); the distance (L2) between the driver and the front of the vehicle is determined through the driver positioning system. To prevent data loss due to the vehicle not fully entering the measurement area, the system is designed to ensure that the distance (L8) between the lifting lever's blocking bar and the farthest sensor on the measurement reference plane is at least 50cm, forcing the vehicle to completely pass through the measurement area to reach the blocking position, thus ensuring the integrity of the external contour data.

[0128] After acquiring the basic data, the control system immediately performs intelligent analysis and parameter presets. Based on the vehicle's ground clearance (H), the system categorizes vehicles into three main types: sedans, vans / medium-sized trucks, or freight trucks, and automatically matches the voltage level of the cold cathode X-ray source accordingly: if identified as a sedan, the system switches to a negative bias voltage mode (d-30KV); for a medium-sized vehicle, it maintains the rated voltage (dKV); and for a freight truck, it upgrades to a positive bias voltage mode (d+30KV). Simultaneously, the driver positioning system accurately measures the driver's physical position (L2) from the front of the vehicle. Combining the vehicle width (W) and the X-ray source deflection angle (θ), the system uses geometric formulas to calculate the safe hysteresis distance (L1), and superimposes these values ​​to generate the final cab wireframe length (L) including the driver's position, thus defining an absolute safety limit for subsequent precise triggering.

[0129] After the above parameter calculations are completed, the barrier gate automatically raises to allow passage, and the vehicle continues to slowly move forward into the inspection area. At this time, the vehicle passes sequentially through the first and second inductive loops of the driving direction mutual inductance device. The control system monitors the induction state sequence of the two loops in real time (such as the process from (1,0) to (1,1) and then to (0,0)) to confirm whether the vehicle is in a normal forward-moving state. If it is determined to be reversing, the system will lock the X-ray source and prevent it from being turned on; only after confirming that it is in a forward-moving state will the system allow it to enter the next stage of the triggering process.

[0130] As the vehicle approaches the X-ray source, the system simultaneously performs mechanical avoidance and triggers a countdown calculation. On one hand, the system uses the reconfirmed vehicle height (H), combined with the lane width (m) and the X-ray source installation height (h), i.e., the vertical distance between the X-ray source focal point and the ground, to calculate a new beam angle suitable for the current vehicle height. The system then drives the shading mechanism downwards by the calculated shading distance (L5), physically limiting the upper edge of the X-ray beam to ensure it avoids the driver. On the other hand, the system acquires the real-time vehicle speed (V) and the X-ray source's activation delay time (t), calculating the delay compensation distance (L4). The system then subtracts the sensor blind zone distance (L3) and the delay compensation distance (L4) from the total safe length (L), converting this into the specific trigger number (N) of the position sensor array.

[0131] Finally, when the vehicle's front end actually triggers the Nth position sensor on the ground, the control system immediately issues an activation command. After a millisecond-level activation delay (t), the X-ray source precisely emits its beam the instant the vehicle has traveled the compensation distance (L4), at which point the driver has completely passed the danger zone, and the X-ray begins scanning close to the rear of the cab. As the vehicle continues to move, when the rear of the vehicle leaves the height sensor, the system calculates the shutdown delay time (T) based on the distance between the height sensor and the transmitter (L7) and the real-time vehicle speed (V). At the instant the timer reaches time T, the X-ray source stops emitting its beam, thus achieving a full-coverage scan of the vehicle and its cargo while minimizing environmental radiation, completing the entire security inspection process.

[0132] Furthermore, some embodiments of this application also provide an electronic device. The electronic device can be various forms of digital computer, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, etc. The electronic device can also be various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices.

[0133] The electronic device includes: one or more processors; and a memory storing computer program instructions that, when executed, cause the processor to perform the steps of the methods provided in any one or more of the above embodiments. Figure 10 An exemplary structural diagram of the electronic device is disclosed. The electronic device includes one or more processors 1101, a memory 1102, and interfaces for connecting the various components, including high-speed interfaces and low-speed interfaces. The various components are interconnected via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions executed within the electronic device, including instructions stored in or on memory to display graphical information of a GUI on an external input / output device (such as a display device coupled to the interface). In some other embodiments, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple electronic devices can be connected, each providing some of the necessary operations. The components, their connections and relationships, and their functions shown herein are merely examples and are not intended to limit the implementation of the present application described and / or claimed herein.

[0134] The electronic device may further include an input device 1103 and an output device 1104. The processor 1101, memory 1102, input device 1103 and output device 1104 may be connected by a bus or other means, as shown in the figure, which is connected by a bus.

[0135] Input device 1103 can receive input numerical or character information, and generate key signal inputs related to user settings and function control of the electronic device, such as a touch screen, keypad, mouse, trackpad, touchpad, joystick, one or more mouse buttons, trackball, joystick, etc. Output device 1104 may include a display device, auxiliary lighting device (e.g., LED), and haptic feedback device (e.g., vibration motor). The display device may include, but is not limited to, a liquid crystal display, a light-emitting diode display, and a plasma display. In some embodiments, the display device may be a touch screen.

[0136] To provide interaction with the user, the electronic device can be a computer. The computer has: a display device (e.g., a cathode ray tube or LCD monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback); and input from the user can be received in any form (e.g., voice input or tactile input).

[0137] In this embodiment, a computer-readable medium stores a computer program / instructions that, when executed by a processor, implement the steps of the methods provided in any one or more of the above embodiments. This computer-readable medium may be included in the electronic device described in the above embodiments; or it may exist independently and not assembled into that device. The aforementioned computer-readable medium carries one or more computer-readable instructions.

[0138] The memory 1102 can serve as a non-transitory computer-readable storage medium, used to store non-transitory software programs, non-transitory computer-executable programs, and modules. The processor 1101 executes various functional applications and data processing of the server by running the non-transitory software programs, instructions, and modules stored in the memory 1102, thereby implementing the program instructions / modules corresponding to the methods provided in any one or more of the embodiments described above in this application.

[0139] The memory 1102 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the electronic device. Furthermore, the memory 1102 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 1102 may optionally include memory remotely located relative to the processor 1101, and these remote memories can be connected to the electronic device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0140] It should be noted that the computer-readable medium described in this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. Computer-readable media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to, electrical connections having one or more wires, portable computer disks, hard disks, random access memory, read-only memory, erasable programmable read-only memory, optical fibers, portable compact disk read-only memory, optical storage devices, magnetic storage devices, or any suitable combination thereof. In this application, a computer-readable medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0141] Computer-readable media include permanent and non-permanent, removable and non-removable media, which can store information by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory, static random access memory, dynamic random access memory, other types of random access memory, read-only memory, electrically erasable programmable read-only memory, flash memory or other memory technologies, read-only optical discs, digital versatile optical discs or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0142] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including local area networks (LANs) or wide area networks (WANs), or it can be connected to an external computer (e.g., via the Internet through an Internet service provider).

[0143] In the above embodiments, all or part of the implementation can be achieved through software, hardware, firmware, or any combination thereof. For example, it can be implemented using an application-specific integrated circuit (ASIC), a general-purpose computer, or any other similar hardware device. In some embodiments, the software program of this application can be executed by a processor to implement the above steps or functions. Similarly, the software program of this application (including related data structures) can be stored in a computer-readable recording medium, such as RAM memory, magnetic or optical drives, floppy disks, and similar devices. In addition, some steps or functions of this application can be implemented in hardware, for example, as circuitry that cooperates with a processor to perform the various steps or functions.

[0144] The computer program product provided in this application includes one or more computer programs / instructions. When executed by a processor, these computer programs / instructions generate, in whole or in part, the processes or functions described in this application. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive), etc.

[0145] The flowcharts or block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of devices, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-specific system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0146] The scope of this application is defined by the appended claims rather than the foregoing description, and is therefore intended to encompass all variations falling within the meaning and scope of equivalents of the claims. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices recited in a device claim may also be implemented by a single unit or device in software or hardware. Terms such as "first," "second," etc., are used only for distinguishing descriptions and do not indicate any particular order, nor should they be construed as indicating or implying relative importance.

[0147] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily made by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims, and the above embodiments should be regarded as exemplary and non-limiting.

Claims

1. An adaptive vehicle cold cathode X-ray detection control method, characterized in that, The method includes: When the vehicle to be inspected enters the inspection area, the external contour data of the vehicle to be inspected is acquired by a triaxial measuring device, and the external contour data includes at least the vehicle's height off the ground. The vehicle type of the vehicle to be inspected is identified based on the external contour data of the vehicle to be inspected; Based on the identified vehicle type, the voltage level of the X-ray source is matched, wherein different vehicle types correspond to different bias voltage modes; Determine the timing for turning on the X-ray source, and in response to the timing, drive the X-ray source to emit a beam according to the matched voltage level to scan the vehicle to be inspected.

2. The method according to claim 1, characterized in that, The step of matching the voltage level of the X-ray source according to the identified vehicle type specifically includes: If the vehicle type is determined to be a sedan, a negative bias voltage mode is matched to reduce the radiation dose; If the vehicle type is determined to be a van or a medium-sized truck, then the rated voltage mode is matched; If the vehicle type is determined to be a freight truck, a positive bias voltage mode is matched to improve penetration.

3. The method according to claim 1, characterized in that, The X-ray source is equipped with a movable light-shielding mechanism, and the method further includes: Based on the vehicle's ground clearance, the lane width of the detection channel, and the preset beam angle parameters of the X-ray source, calculate the downward shading distance that the shading mechanism needs to move. Before the X-ray source emits its beam, the light-shielding mechanism is driven to move downward by the light-shielding distance, thereby adjusting the irradiation range of the X-ray beam.

4. The method according to claim 3, characterized in that, The method for calculating the shading distance is as follows: Using the horizontal line where the X-ray source focal point is located as a reference, calculate the beam exit angle of the vehicle's top edge relative to the horizontal line. It satisfies the formula: Where H is the vehicle's height off the ground, h is the vertical distance between the X-ray source focal point and the ground, m is the lane width, and W is the width of the vehicle to be measured. Based on the initial preset beam exit angle β and the calculated beam exit angle Calculate the light-shielding distance L5 of the light-shielding mechanism inside the launch box: Where D is the horizontal distance from the X-ray source focal point to the plane of the light-shielding mechanism.

5. The method according to claim 1, characterized in that, The detection area is equipped with a height sensor and a sensor array consisting of multiple position sensors along the driving direction. Determining the timing of turning on the X-ray source specifically includes: Obtain the driver's position inside the vehicle and calculate the safe lag distance based on preset deflection angle parameters to generate a cab wireframe diagram length that includes the driver's position; Obtain the real-time vehicle speed (V) and the X-ray source start-up delay time (t) of the vehicle to be inspected; calculate the delay compensation distance traveled by the vehicle during the period from X-ray source start-up to beam exit. ; Calculate the position sensor number (N) used to trigger the activation signal; the formula for calculating the number (N) satisfies: Where L is the length of the cab wireframe diagram, L3 is the distance between the height sensor and the position sensor, and L6 is the spacing between individual position sensors.

6. An adaptive vehicle cold cathode X-ray detection control system, characterized in that, include: A three-axis measuring device is installed at the entrance of the inspection channel to collect external contour data of the vehicle to be inspected, and includes a driver positioning system. The sensor assembly includes a height sensor and multiple position sensors arranged along the driving direction for detecting the vehicle's position. A cold cathode X-ray source is used to emit X-rays to scan vehicles; A receiving column is disposed on the side of the detection channel opposite to the cold cathode X-ray source, and cooperates with the cold cathode X-ray source to receive X-ray signals after penetrating the vehicle; The control system is connected to the triaxial measuring device, the sensor assembly, and the cold cathode X-ray source, respectively. The control system is used to receive the external contour data and identify the vehicle type; according to the identified vehicle type, the voltage level of the X-ray source is matched, wherein different vehicle types correspond to different bias voltage modes; The control system is also used to determine when the X-ray source is turned on, and in response to the turning on timing, drive the X-ray source to emit a beam according to the matched voltage level to scan the vehicle to be inspected.

7. The system according to claim 6, characterized in that, The cold cathode X-ray source is also equipped with a light-shielding mechanism and a driving device at the beam exit. The control system is also used to calculate the shading adjustment value based on the vehicle's height data, and control the drive device to move the shading mechanism to change the irradiation range of the X-ray beam.

8. The system according to claim 6, characterized in that, The system also includes a vehicle direction sensing device; The driving direction mutual inductance device includes a first ground inductor coil and a second ground inductor coil arranged along the driving direction. The control system determines whether the vehicle is moving forward or backward by monitoring the changes in the sensing states of the first and second inductive loops. When the system determines that the vehicle is moving forward, it controls the cold cathode X-ray source to be turned on.

9. An electronic device, characterized in that, The electronic device includes: One or more processors; and A memory storing computer program instructions, which, when executed, cause the processor to perform the steps of the method as described in any one of claims 1 to 5.

10. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method according to any one of claims 1 to 5.

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