CN215116840U

CN215116840U - Radiation inspection system

Info

Publication number: CN215116840U
Application number: CN202120454914.0U
Authority: CN
Inventors: 曹艳锋
Original assignee: Powerscan Co ltd
Current assignee: Powerscan Co ltd
Priority date: 2021-03-02
Filing date: 2021-03-02
Publication date: 2021-12-10
Anticipated expiration: 2031-03-02

Abstract

The utility model provides a radiation inspection system. The radiation inspection system is used for performing radiation inspection on a vehicle travelling along a travelling direction defined by a radiation inspection passage and comprises radiation imaging devices, wheel detection devices and a control device, wherein the radiation imaging devices are used for performing radiation scanning imaging on the vehicle passing through a detection area, the wheel detection devices are used for detecting whether wheels of the vehicle reach or are about to reach the detection area and sending a first trigger signal to the control device in response to detecting that the wheels of the vehicle reach or are about to reach the detection area, and the control device is used for controlling the radiation imaging devices to emit radiation beams to the detection area in response to receiving the first trigger signal again after receiving the first trigger signal for the first time. Therefore, the starting time of scanning the vehicle trunk can be determined by means of the wheel detection device, so that the radiation inspection of the vehicle trunk can be rapidly carried out while the safety of a passenger and a driver is ensured.

Description

Radiation inspection system

Technical Field

The utility model relates to a radiation imaging field especially relates to a radiation inspection system.

Background

In the occasions of vehicle security inspection such as public security inspection stations, land ports and the like, under the condition that windows are opened, visual inspection can be easily and quickly carried out on passenger carrying areas of passenger vehicles, but the trunk must be opened for inspection, and if packaged articles (such as a trunk or the whole box of articles) exist, the trunk needs to be opened for inspection, so that time and labor are wasted, and the closing speed is seriously influenced.

When utilizing traditional radiation imaging device to carry out radiation inspection to the vehicle, in order to guarantee passenger car driver and passenger safety, need driver and passenger to get off the bus then do not unpack the scanning inspection, this kind of check-up efficiency is very low, seriously influences normal current, and the result of use is than poor.

How to carry out the radiation inspection to the trunk under guaranteeing passenger car driver and passenger's safety condition fast is the problem that awaits solving at present.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a can carry out the scheme that radiates the inspection to the trunk fast under guaranteeing passenger car driver and passenger safety condition.

According to a first aspect of the present invention, a radiation inspection system is provided for performing radiation inspection on a vehicle traveling along a traveling direction defined by a radiation inspection passage, the radiation inspection system includes a radiation imaging device, a wheel detection device and a control device, the radiation imaging device is used for performing radiation scanning imaging on the vehicle passing through a detection area, the wheel detection device is used for detecting whether a wheel of the vehicle reaches or is about to reach the detection area, and in response to detecting that the wheel of the vehicle reaches or is about to reach the detection area, a first trigger signal is sent to the control device, and the control device is used for controlling the radiation imaging device to emit a radiation beam to the detection area in response to receiving the first trigger signal again after receiving the first trigger signal for the first time.

According to a second aspect of the present invention, there is provided a radiation inspection system for performing radiation inspection on a vehicle traveling along a traveling direction defined by a radiation inspection passage, the radiation inspection system comprising a radiation imaging device for performing radiation scanning imaging on the vehicle passing through a detection area, a vehicle body detection device for detecting whether a wheel of the vehicle reaches or is about to reach the detection area and sending a first trigger signal to the control device in response to the detection of the arrival or the about to reach of the wheel of the vehicle from the detection area not detected by the wheel of the vehicle to the detection area, a vehicle body detection device for detecting whether a body of the vehicle reaches or is about to reach the detection area and sending a second trigger signal to the control device in response to the detection of the arrival or the about to reach of the body of the vehicle to the detection area, the control device is used for controlling the radiation imaging device to emit the radiation beam to the detection area in response to receiving the second trigger signal, and controlling the radiation imaging device to stop emitting the radiation beam to the detection area in response to receiving the first trigger signal for the first time after receiving the second trigger signal.

According to a third aspect of the present invention, there is provided a radiation inspection system for performing radiation inspection on a vehicle traveling along a traveling direction defined by a radiation inspection passage, the radiation inspection system comprising a radiation imaging device for performing radiation scanning imaging on the vehicle passing through a detection area, a vehicle body detection device for detecting whether a wheel of the vehicle reaches or is about to reach the detection area and sending a first trigger signal to the control device in response to the detection of the arrival or the about to reach of the wheel of the vehicle from the detection area not detected by the wheel of the vehicle to the detection area, a vehicle body detection device for detecting whether a body of the vehicle reaches or is about to reach the detection area and sending a second trigger signal to the control device in response to the detection of the arrival or the about to reach of the body of the vehicle, the control device is used for: in response to receiving the second trigger signal, controlling the radiation imaging device to emit a radiation beam to the detection area at the first scan parameter; and/or in response to receiving the first trigger signal for a first time after receiving the second trigger signal, controlling the radiation imaging apparatus to emit a radiation beam towards the detection area at the second scan parameter; and/or in response to receiving the first trigger signal again after receiving the first trigger signal for the first time, controlling the radiation imaging apparatus to emit the radiation beam to the detection area at a third scan parameter.

To sum up, the utility model discloses a radiation inspection system is through receiving first trigger signal again by controlling means through responding to after receiving first trigger signal for the first time by controlling means, and control radiation image device is to the detection area transmission radiation beam for can radiate the inspection fast to the vehicle trunk when guaranteeing passenger car driver and passenger safety.

In an alternative embodiment, the control device controls the radiation imaging device to emit the radiation beam to the detection area in response to receiving the second trigger signal, and controls the radiation imaging device to stop emitting the radiation beam to the detection area in response to receiving the first trigger signal for the first time after receiving the second trigger signal, so that radiation inspection can be performed on the engine compartment of the vehicle quickly while ensuring safety of the driver and passengers of the vehicle.

In an alternative embodiment, the radiation imaging apparatus may provide three scanning parameters for scanning the front engine compartment, the passenger compartment, and the rear trunk of the vehicle, respectively, and the control device may control the radiation imaging apparatus to switch between the three scanning parameters according to the detection results of the wheel detection device and the vehicle body detection device, so as to scan the front engine compartment, the passenger compartment, and the rear trunk of the vehicle, respectively, using different scanning parameters.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout the exemplary embodiments of the present invention.

Fig. 1 shows a schematic structural diagram of a vehicle model of a general passenger vehicle.

Fig. 2 shows a schematic structural diagram of a radiation inspection system according to an embodiment of the present invention.

Fig. 3 is a schematic view showing a radiation beam emission pattern of a radiation imaging apparatus according to an embodiment of the present invention.

Fig. 4 shows a schematic structural diagram of a radiation inspection system according to another embodiment of the present invention.

Fig. 5A and 5B are schematic structural diagrams illustrating a radiation inspection system according to an embodiment of the present invention.

Fig. 6A and 6B are schematic structural views illustrating a radiation inspection system according to another embodiment of the present invention.

Fig. 7A and 7B are schematic structural views illustrating a radiation inspection system according to another embodiment of the present invention.

Fig. 8A is a radiation scanning image obtained by performing radiation inspection on the entire vehicle.

Fig. 8B is a radiation scan image obtained by performing radiation inspection of the engine compartment at the front end of the vehicle and the trunk at the rear end of the vehicle.

Detailed Description

Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention have been illustrated in the accompanying drawings, it is to be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Passenger cars are primarily used for carrying passengers and their carry-on luggage or temporary objects. Passenger vehicles may include, but are not limited to, cars, minibuses, light buses, and the like.

As shown in fig. 1, a passenger car generally consists of two rows of wheels, a front row of wheels at the head of the car and a rear row of wheels at the tail of the car. The driver and passenger area (i.e., the passenger compartment) is generally located in the area between the front and rear wheels of the vehicle. The area where the vehicle engine is located (i.e., the front engine compartment) is generally located at the vehicle head, such as the area between the front end of the vehicle body and the front wheels of the vehicle, i.e., the front wheels of the vehicle may serve as the dividing line between the engine compartment and the passenger compartment. The vehicle trunk is typically located at the rear of the vehicle, such as in the area between the rear wheels of the vehicle to the rear end of the vehicle body, i.e., the rear wheels of the vehicle may serve as the dividing line between the vehicle trunk and the passenger compartment.

In view of passenger car possesses above-mentioned characteristics on the motorcycle type structure, the utility model provides a, can utilize wheel detection device to confirm the scanning initial position of vehicle trunk to and/or utilize wheel detection device to confirm the scanning end position in vehicle engine compartment. Optionally, the fault tolerance and the anti-interference capability can be improved by matching a vehicle body detection device with a wheel detection device, the mistaken irradiation is avoided, and the radiation safety is improved.

The details of the present invention will be further described with reference to the following embodiments.

Example one

As shown in fig. 2, the radiation inspection system may include a radiation imaging device 110, a wheel detection device 120, and a control device 130. Wherein the radiation inspection system is used for performing radiation inspection on a vehicle travelling along a travelling direction defined by the radiation inspection channel. The vehicle may be a passenger car as shown in fig. 1.

The radiation imaging device 110 may be disposed at a predetermined position on the radiation inspection passage for radiation scanning imaging of the vehicle passing through the detection area. Wherein, the detection area can refer to the coverage area of the ray bundle emitted by the radiation imaging device in the radiation inspection channel.

The radiation imaging device 110 may be a transmission type radiation imaging device or a backscatter radiation imaging device. The radiation inspection system may include one or more radiation imaging devices 110.

The radiation imaging device 110 may include a radiation source, one or more detectors, and an image processor. The radiation source is used for emitting scanning ray beams for imaging to a detected object, and the one or more detectors are used for receiving radiation signals scattered or transmitted from the detected object. The arrangement of the detectors is different according to the imaging principle of the radiation imaging device 110 (backscatter imaging or transmission imaging), and the specific arrangement of the detectors is well known to those skilled in the art and will not be described herein. The image processor is used for generating corresponding radiation images according to the radiation signals received by the at least one detector array. In addition, the radiation imaging apparatus 110 may further include other auxiliary devices such as a shielding device and a collimator, which are not described in detail herein.

The wheel detecting device 120 is wirelessly or wiredly connected to the control device 130, and the wheel detecting device 120 is configured to detect whether a wheel of the vehicle reaches or is about to reach the detection area, and send a first trigger signal to the control device 130 in response to detecting that the wheel of the vehicle reaches or is about to reach the detection area.

The wheel detecting device 120 may be provided for detecting whether the wheel of the vehicle reaches a first detection position, and the first detection position may be located near the detection area, not more than 500mm from the detection area. That is, the first detection position may be located on a side of the detection region near the entrance of the radiation inspection tunnel (i.e., an upstream side of the detection region), or may be located on a side of the detection region near the exit of the radiation inspection tunnel (i.e., a downstream side of the detection region).

The first detected position is indicative of the position of the wheel location within the radiation inspection tunnel that triggered the wheel detection device 120, i.e., the wheel detection position in the direction of vehicle travel. When different devices (such as a pressure sensor and a correlation sensor) are used for the wheel detecting device 120, the specific wheel part triggered by the wheel detecting device 120 is different. For example, when the wheel detecting device 120 employs a pressure sensor, the pressure sensor is triggered when the wheel center reaches the first detection position; when the wheel detection device adopts the correlation sensor, the correlation sensor may be triggered when the front edge of the wheel reaches the first detection position. Whereas it is generally the case that the wheel center is substantially near the rear seat position, i.e., strictly speaking, the wheel center is the dividing line between the vehicle trunk and the passenger compartment.

Thus, the first detection position may be set according to the specific wheel location at which the wheel detecting device 120 is activated.

For example, when the wheel detecting device 120 employs a pressure sensor, since the wheel detecting device 120 is triggered when the wheel center portion reaches the first detection position, the first detection position may be disposed at a position closer to the detection area in the vehicle traveling direction, for example, the first detection position may be located at the detection area, or a position slightly upstream of the detection area, or may be a position slightly downstream of the detection area.

As another example, when the wheel detecting device 120 employs a correlation sensor, since the wheel detecting device 120 may be triggered when the leading edge of the wheel reaches the first detecting position, in order that the timing of the trigger signal issued by the wheel detecting device 120 in response to the arrival of the rear wheel may serve as the starting timing of the radiation inspection of the trunk of the vehicle, the first detection position may be provided at a distance on the downstream side of the detection area, specifically, the first detection position may be located at a position between 100mm and 300mm from the detection area on the downstream side of the radiation inspection tunnel (i.e., on the side away from the entrance of the radiation inspection tunnel) in view of the fact that the tire radius of the wheel of the vehicle does not generally exceed 300mm, to ensure that the vehicle passenger area (i.e., passenger compartment) has left the detection zone and the leading edge of the vehicle trunk has reached or is about to reach the detection zone when the rear wheels of the vehicle trigger the wheel detection device 120. The wheel detecting device 120 may be triggered by the wheel but not by the vehicle body, that is, the wheel detecting device 120 may transmit the first trigger signal to the control device 130 in response to the wheel of the vehicle reaching the first detection position, and may not transmit the first trigger signal to the control device 130 in response to the vehicle body (i.e., the vehicle body) of the vehicle reaching the first detection position.

The wheel detecting device 120 may be a first correlation sensor including a first signal transmitting portion and a first signal receiving portion, the first signal transmitting portion and the first signal receiving portion being respectively disposed at both sides of the radiation inspection passage, the first correlation sensor being configured to detect whether a wheel is present at least one first height position within a first height range of the first detection position with respect to the ground of the radiation inspection passage in the vertical direction, based on whether the first signal receiving portion receives a signal transmitted by the first signal transmitting portion.

The first height range may be set to 30 mm-150 mm and the first height position may typically be set to 50mm to ensure that the sensor is not triggered by the vehicle body but by the wheels. Since the vehicle is driven through the detection area at a speed of up to 15km/h or more, the duration of the triggering of the wheel detection device 120 by the wheel is estimated to be about 50ms, and therefore, preferably, the reaction time of the wheel detection device 120 should be no greater than 50ms, more preferably, no greater than 20ms, for example, the wheel detection device 120 may be a photoelectric sensor with fast reaction.

The wheel sensing device 120 may also be a pressure sensor, which may be mounted at a first sensing location within the radiation inspection tunnel, and in particular may be mounted on the ground at the first sensing location or partially below the ground and partially above the ground.

The pressure sensor is configured to detect whether a wheel of the vehicle reaches the first detection position based on whether the pressure applied at the first detection position exceeds a predetermined threshold (which may be referred to as a second threshold for ease of distinction). That is, the pressure sensor may be triggered only when the pressure applied thereto is greater than the second threshold value, so as to prevent the pressure sensor from detecting a pedestrian, a bicycle, a motorcycle, or the like, which enters the inspection passage by mistake, as a wheel of the passenger vehicle. Wherein the second threshold may be set to 2000N.

The control device 130 is configured to control the radiation imaging device 110 to emit the radiation beam to the detection area in response to receiving the first trigger signal again after receiving the first trigger signal for the first time.

The control device 130 may be connected to the switching device of the radiation imaging device 110, and control the radiation imaging device 110 to emit the radiation beam to the detection area or stop emitting the radiation beam by controlling the switching state of the switching device of the radiation imaging device 110.

The control device 130 may also be connected to one or more blinding devices. The control device 130 can control whether the radiation beam emitted by the radiation imaging device 110 can be incident on the detection area by adjusting the position of the shielding device to shield or not the path of the radiation beam emitted by the radiation imaging device 110 to the detection area, so as to control the radiation imaging device 110 to emit the radiation beam to the detection area or stop emitting the radiation beam. In addition, the control device 130 may also control the radiation imaging device to emit the radiation beam to the detection area by adopting other manners, which is not described in detail in the present invention.

The control device 130 indicates that the front wheel of the vehicle reaches or is about to reach the detection area when receiving the first trigger signal sent by the wheel detection device 120 for the first time. The control device 130 indicates that the rear wheel of the vehicle reaches or is about to reach the detection area when it receives the first trigger signal again after it receives the first trigger signal for the first time. From the above analysis of passenger vehicle model structure, the rear wheels of the vehicle can be used as the boundary between the trunk and the passenger compartment of the vehicle. That is, the position (or timing) at which the rear wheel of the vehicle reaches or is about to reach the detection area may be used as the scanning start position (or timing) of the trunk of the vehicle. Accordingly, the control device 130 may control the radiation imaging device 110 to start emitting the radiation beam to the detection area in response to receiving the first trigger signal again after receiving the first trigger signal sent by the wheel detection device 120 for the first time. Thus, the scanning start position (or scanning start time) of the trunk is determined by the wheel detecting device 120, and the radiation inspection of the trunk of the vehicle can be realized.

As an example, when the receiving time interval between two adjacent first trigger signals received by the control device 130 is smaller than a predetermined threshold (for convenience of distinction, may be referred to as a first threshold), the two first trigger signals may be considered to be triggered by the front and rear wheels of the same vehicle, respectively. Therefore, the control device 130 may control the radiation imaging device to emit the radiation beam to the detection area in a case that the receiving time interval of two adjacent first trigger signals is smaller than the first threshold value. The first threshold value may be a preset time length value, for example, a time length may be estimated according to the maximum passenger compartment length and the minimum traveling speed of the vehicle as the first threshold value, that is, the first threshold value may be determined based on the maximum passenger compartment length and the minimum traveling speed of the vehicle, for example, the first threshold value may be equal to the maximum passenger compartment length divided by the minimum traveling speed of the vehicle.

In the present embodiment, under the control of the control device 130, the radiation imaging device 110 may perform radiation inspection only on the trunk of the vehicle, and omit the inspection of the front end of the vehicle where the engine is located and the area where the passenger is located in the vehicle.

That is, the radiation imaging device 110 may not emit the radiation beam to the detection area initially, and the control device 120 controls the radiation imaging device 110 to start emitting the radiation beam to the detection area in response to receiving the first trigger signal sent by the wheel detection device 120 again after receiving the first trigger signal sent by the wheel detection device 120 for the first time during the vehicle passes through the detection area along the traveling direction defined by the radiation inspection passage.

Considering that the rear seats of the vehicle generally have a certain backward inclination angle, the radiation imaging device 110 may be configured such that the radiation scanning plane formed by the emitted radiation beams has a predetermined angle with a vertical plane perpendicular to the traveling direction of the vehicle, and the radiation scanning plane is inclined toward a side close to the entrance of the radiation inspection tunnel, that is, a side opposite to the traveling direction of the vehicle in the radiation inspection tunnel. As an example, the predetermined included angle may be between 5 and 30 degrees.

As shown in FIG. 3, the passenger car 2 travels along the traveling direction defined by the radiation inspection passage 1 (i.e. the direction indicated by the arrow in the figure), the radiation beam 14 emitted by the radiation imaging device 110 is in the direction relative to the height of the vehicle, and the height of the radiation beam 14 can be inclined 5-30 degrees towards the tail of the vehicle. Thus, with this arrangement, the passenger compartment can be scanned as little as possible while radiation scanning of the vehicle trunk is achieved, and in an alternative embodiment the front engine compartment can be scanned as much as possible while radiation scanning is also performed on the engine compartment at the front of the vehicle.

The control device 130 is further configured to control the radiation imaging device 110 to stop emitting the radiation beam to the detection area after a predetermined time (for convenience of distinction, may be referred to as a third predetermined time) from the moment of controlling the radiation imaging device to emit the radiation beam to the detection area. The third predetermined period of time may be a predetermined period of time value, such as the third predetermined period of time may be estimated based on the maximum trunk length and the minimum travel speed of the vehicle, i.e., the third predetermined period of time may be equal to the maximum trunk length divided by the minimum travel speed of the vehicle.

If the control device 130 receives a new first trigger signal within the third predetermined time period of the delay time, indicating that the front wheel of a new vehicle (i.e., the rear vehicle) is arriving at or is about to arrive at the detection area, in order to avoid the portion of the front of the rear vehicle that is not allowed to be scanned (e.g., the passenger compartment) being mis-scanned, the control device 130 may control the radiation imaging device 110 to stop emitting the radiation beam to the detection area in response to receiving the new first trigger signal within the third predetermined time period of the delay time.

As an example, the radiation inspection system may further comprise a speed measurement device. The speed measuring device is used to detect the traveling speed of the vehicle along the traveling direction defined by the radiation inspection tunnel and transmit the detected traveling speed to the control device 130. The speed measuring device may be a separate radar or video speed measuring device, which may transmit the real-time detected vehicle speed to the control device 130. Alternatively, the speed measuring device may be composed of two vehicle body detecting devices disposed at a certain distance L, and the control device 130 may determine the traveling speed V of the vehicle by the time difference T triggered by the two vehicle body detecting devices, where V is L/T. For the vehicle body detection device, reference may be made to the following description.

The control device 130 may adjust the scanning parameters of the radiation imaging device 110 according to the traveling speed and/or correct the scanned image according to the traveling speed. For example, the control device 130 may perform low-speed protection, adjustment of output dose rate of the radiation source with speed according to the vehicle traveling speed V (the adjustment of the output dose rate may be implemented by adjusting the emission frequency of the radiation source, the electron average beam intensity, the energy, and the like, so as to ensure that the stray radiation dose received by the vehicle driver is at a considerable level at different speeds), geometric image correction, and the like.

As an example, the radiation inspection system may further include an imaging device. The camera device is used for shooting at least the area where the passenger is located in the vehicle so as to obtain the image data of the area where the passenger is located. The camera device can photograph the interior of the vehicle when the window of the vehicle is opened. Therefore, the condition in the vehicle can be captured by the camera device, so that security check personnel can check whether the passenger area carries contraband or not.

Taking the passenger compartment of the vehicle as an example including two rows of seats, the camera device may include a first camera device and a second camera device, both the first camera device and the second camera device are disposed on a side of the detection area away from the entrance of the radiation inspection passage, a distance between the first camera device and the detection area is smaller than a distance between the second camera device and the detection area, the control device 130 is further configured to control the first camera device to photograph an area where a passenger in a rear row of the vehicle is located and control the second camera device to photograph an area where a passenger in a front row of the vehicle is located in response to receiving the first trigger signal again after receiving the first trigger signal for the first time. For example, the image capturing devices may include 4 high-speed cameras respectively installed on the downstream sides of the wheel detecting devices 120 on both sides of the radiation inspection passage, wherein 2 cameras (i.e., the first image capturing devices) near the wheel detecting devices 120 are located at a distance of about 500mm from the wheel detecting devices 120 for photographing the second row area (i.e., the rear passenger area) of the vehicle; the 2 cameras (i.e., the second photographing devices) far from the wheel sensing device 120 are spaced apart from the wheel sensing device 120 by a distance of about 1.5m for photographing the first row area (i.e., the front passenger area) of the vehicle. The control device 130 triggers each camera to take a picture when detecting that the rear wheels of the vehicle are reached (i.e., the first trigger signal is received for the second time).

The radiation inspection system may further include a vehicle type recognition device. The vehicle type recognition device is used for recognizing the vehicle type of the vehicle and sending the vehicle type recognition result to the control device 130, and the control device 130 is further used for adjusting the position parameter and/or the camera shooting parameter of the camera shooting device according to the vehicle type recognition result. For example, a vehicle type recognition camera may be provided at the top of the radiation inspection passage, and the control device 130 may automatically adjust the horizontal and height positions of the image pickup devices (such as the above-mentioned 4 cameras) according to the vehicle type recognized by the vehicle type recognition camera, so as to obtain the best photographing effect.

As an example, the radiation inspection system may further include a license plate recognition device. The license plate recognition device is disposed at a side of the detection area away from the entrance of the radiation inspection passage, and the control device 130 is further configured to control the license plate recognition device to recognize the license plate of the vehicle in response to receiving the first trigger signal for the first time. For example, a typical arrangement is such that the license plate recognition device is installed on the side of the passageway on the downstream side of the wheel detection device 120, about 5 meters from the wheel detection device 120 in the vehicle traveling direction, and the control device 130 issues a snapshot command to the license plate recognition device when the wheel detection device 120 is first activated (preferably, when both the vehicle body detection device and the wheel detection device are first activated).

As an example, the radiation inspection system may further include a display device. The display device is used for displaying the radiation scanning image and/or information related to the radiation scanning image. For example, the radiation scanning image, the in-vehicle snapshot image, the license plate snapshot and the recognition result are bound together and are uniformly displayed on a computer screen for security check personnel to check and analyze.

Example two

As shown in fig. 4, the radiation inspection system may include a radiation imaging device 110, a wheel detection device 120, a control device 130, and a vehicle body detection device 140. As for the radiation imaging device 110 and the wheel detecting device 120, the above description related to fig. 2 can be referred to.

The vehicle body detection device 140 is configured to detect whether the vehicle body of the vehicle reaches or is about to reach the detection area, and send a second trigger signal to the control device 130 in response to detecting that the vehicle body of the vehicle reaches or is about to reach the detection area. Wherein the vehicle body detection device is always in a trigger state during the process that the vehicle to be inspected passes through the vehicle body detection device 140, that is, the second trigger signal is a continuous signal.

As described above with respect to the wheel detecting device 120 in the first embodiment, the wheel detecting device 120 may be configured to detect whether the wheel of the vehicle reaches a first detection position, which is located near the detection area, for example, may be a side slightly close to the exit of the radiation inspection tunnel.

The vehicle body detection device 140 may be configured to detect whether the vehicle body of the vehicle reaches a second detection position, which is the same as the first detection position, or the second detection position is located on a side of the first detection position near the entrance of the radiation inspection tunnel, or the second detection position is located on a side of the first detection position near the exit of the radiation inspection tunnel, so that the wheel detection device 120 detects the front tire of the vehicle only after the vehicle body detection device 140 detects the leading edge of the vehicle body. In the case where the second detection position is located on the side of the first detection position close to the exit of the radiation inspection tunnel, the distance between the second detection position and the first detection position should be less than or equal to a predetermined threshold value (which may be referred to as a third threshold value for easy distinction) for causing the wheel detection device 120 to detect the front tire of the vehicle only after the vehicle body leading edge timing is detected by the vehicle body detection device 140. Wherein the third threshold value may be set according to the distance between the leading edge of the vehicle and the front tyre of the vehicle, for example the third threshold value may be 500 mm.

The second detection position is indicative of a position of the body part triggering the body detection device 140 within the radiation inspection tunnel, i.e., a body detection position in the vehicle traveling direction. As described above, the first detection position is indicative of the position of the wheel location within the radiation inspection tunnel that triggers the wheel detection device 120, i.e., the wheel detection position in the direction of vehicle travel. Therefore, the distance between the first detection position and the second detection position refers to a distance in the vehicle traveling direction (generally, the horizontal direction).

The vehicle body detecting device 140 may be a second correlation sensor including a second signal transmitting portion and a second signal receiving portion, the second signal transmitting portion and the second signal receiving portion being respectively provided on both sides of the radiation inspection passage, the second correlation sensor being configured to detect whether the vehicle body exists at least one second height position in a second height range in the vertical direction at the second detection position, based on whether the second signal receiving portion receives a signal transmitted by the second signal transmitting portion. The vehicle body detection device 140 may provide a vehicle body arrival signal (i.e., a second trigger signal) only when detecting that the vehicle bodies exist at a plurality of consecutive height positions within the second height range in the vertical direction at the second detection position at the same time, so as to improve the anti-interference capability.

The second height range may be determined from statistical data of body chassis heights and body roof heights of a large number of passenger vehicles. For example, the detection height of the second correlation sensor may cover at least a height range of 300mm-800mm, such as 200mm-1200 mm. The vehicle body detection device 1140 may give the vehicle body arrival information when a plurality of consecutive heights not less than 300mm in the height direction are all triggered at the same time.

When the wheel detecting device 120 and the vehicle body detecting device both employ a correlation sensor (e.g., a photoelectric sensor), the second height range does not overlap with the first height range described above, and any one of the second height ranges is larger than any one of the first height ranges. Moreover, when the wheel detection device 120 and the vehicle body detection device both use correlation sensors, it is a significant advantage to overlap the second detection position and the first detection position, that is, when a pedestrian entering by mistake triggers the vehicle body detection device 140, the wheel detection device 120 is also triggered, and it is difficult to realize that the vehicle body detection device 140 is continuously triggered and the wheel detection device 120 is triggered twice in sequence, so that the mis-scanning when the pedestrian enters by mistake can be effectively prevented.

The vehicle body detection device 140 may also be a ground coil vehicle detector installed under the ground, or a radar vehicle detector installed on the side of a radiation inspection passage, or a laser scanner, a microwave infrared composite radar, or the like.

When the vehicle body detection device 140 is just triggered, the wheel detector 120 should be in an unfired state, that is, only when the vehicle body detection device 140 triggers the rear wheel detector 120, the control device 130 may determine that the rear wheel reaches the signal, otherwise, it is considered as a false trigger.

Therefore, the control device 130 may control the radiation imaging device 110 to emit the radiation beam to the detection area when the rear wheel of the vehicle is considered to reach or be about to reach the detection area in the case that the second trigger signal is received first and the first trigger signal is received twice after the second trigger signal is received.

When the vehicle body detection device 140 is reset (i.e., switched from the triggered state to the non-triggered state), it indicates that the vehicle leaves the second detection position. Therefore, the control device 130 can control the radiation imaging device 110 to stop scanning in response to switching from receiving the trigger signal issued by the vehicle body detection device 140 to not receiving the trigger signal issued by the vehicle body detection device 140.

Alternatively, when the second detection position is located at the side of the detection area close to the entrance of the radiation inspection tunnel, the control device 130 may control the radiation imaging device 110 to stop emitting the radiation beam to the detection area after delaying for a predetermined time (for convenience of distinction, may be referred to as a first predetermined time) according to the distance between the second detection position and the detection area in response to the time from the reception of the second trigger signal to the non-reception of the second trigger signal (i.e., the vehicle body detection device 140 is switched from the triggered state to the non-triggered state), so as to perform complete detection on the vehicle trunk.

The control device 130 may also control the radiation imaging device 110 to stop emitting the radiation beam to the detection area in response to receiving a new second trigger signal within the first predetermined length of time of the delay. When a new second trigger signal is received, which may be that the following vehicle has arrived or is about to arrive at the detection area, by controlling the radiation imaging device 110 to immediately stop emitting the radiation beam to the detection area when the new second trigger signal is received, it is possible to avoid that the part of the front of the following vehicle that is not allowed to be scanned is mistakenly scanned.

As an example, the radiation inspection system may further include one or more of the speed measuring device, the camera device, the vehicle type recognition device, the license plate recognition device, and the display device mentioned above, which may be referred to the above related description.

Fig. 5A and 5B are schematic structural diagrams illustrating a radiation inspection system according to an embodiment of the present invention. It should be noted that fig. 5A and 5B are described by way of example of a transmission type imaging device, and the control device and the computer device for image processing and display analysis are not shown in the drawings.

Referring to fig. 5A, 5B, the passenger car 2 travels in a traveling direction defined by the radiation inspection passage 1 (i.e., a direction indicated by an arrow in the figure). The radiation imaging device 110 comprises at least a radiation source 11, a radiation source shielding device 12, a radiation beam collimator 13 and a radiation detector unit 15. The radiation beam generated by the radiation source 11 is shielded by the radiation source shielding device 12 and collimated by the collimator 13 to form an imaging radiation beam 14, the position of the imaging radiation beam 14 is a radiation inspection position, the coverage area of the imaging radiation beam 14 in the radiation inspection channel is a detection area, and the radiation detector unit 15 receives the imaging radiation beam 14 to form a scanned image of an object to be inspected.

The vehicle body detection device 140 and the wheel detection device 120 may both be photoelectric sensors, and the detection positions of the vehicle body detection device 140 and the wheel detection device 120 in the vehicle traveling direction (i.e., the above-mentioned second detection position, first detection position) may coincide and may both be disposed upstream of the radiation inspection position. The operation mechanism of the vehicle body detection device 140 and the wheel detection device 120 can be referred to the above related description.

After the radiation inspection system is started, the vehicle body detection device 140 and the wheel detection device 120 are both in an inactive state, and the radiation inspection system enters a standby state to wait for a vehicle (i.e., a passenger vehicle) to enter.

During the passage of the vehicle through the radiation inspection position in the travel direction defined by the radiation inspection tunnel 1, the vehicle body detection device 140 is first activated, and then the wheel detection device 120 is activated twice in succession. The control device controls the radiation imaging device 110 to start scanning in response to receiving the trigger signal (i.e., the first trigger signal) from the wheel detection device 120 twice after receiving the trigger signal (i.e., the second trigger signal) from the vehicle body detection device 140.

When the vehicle body detection device 140 is reset, it indicates that the vehicle is about to leave the radiation inspection position, and therefore the control device may also delay the control of the radiation imaging device 110 to stop scanning in response to switching from receiving the trigger signal from the vehicle body detection device 140 to not receiving the trigger signal from the vehicle body detection device 140.

Fig. 6A and 6B are schematic structural diagrams illustrating another radiation inspection system according to an embodiment of the present invention. For the meaning of each reference numeral in the drawings, the above description can be referred to, and the description is omitted.

As shown in fig. 6A, 6B, the detection position of the vehicle body detection device 140 in the vehicle traveling direction (i.e., the second detection position) may be located upstream of the radiation inspection position, and the detection position of the wheel detection device 120 in the vehicle traveling direction (i.e., the first detection position) may be located downstream of the radiation inspection position. The working flow of the radiation inspection system during the vehicle traveling along the radiation inspection channel can be as described above with reference to fig. 5A and 5B, and is not described herein again.

Fig. 7A and 7B are schematic structural diagrams illustrating another radiation inspection system according to an embodiment of the present invention. For the meaning of each reference numeral in the drawings, the above description can be referred to, and the description is omitted.

As shown in fig. 7A, 7B, the detection position of the vehicle body detection device 140 in the vehicle traveling direction (i.e., the second detection position), and the detection position of the wheel detection device 120 in the vehicle traveling direction (i.e., the first detection position) may be both located downstream of the radiation inspection position, and the second detection position is located on the side of the first detection position near the exit of the radiation inspection tunnel.

The distance between the second detected position and the first detected position is smaller than a predetermined threshold (i.e., the third threshold mentioned above). During the passage of the vehicle through the radiation inspection position in the travel direction defined by the radiation inspection tunnel 1, the vehicle body detection device 140 is first activated, and then the wheel detection device 120 is activated twice in succession. The control device controls the radiation imaging device 110 to start scanning in response to receiving the trigger signal (i.e., the first trigger signal) from the wheel detection device 120 twice after receiving the trigger signal (i.e., the second trigger signal) from the vehicle body detection device 140.

When the vehicle body detection device 140 is reset, it indicates that the vehicle has left the radiation inspection position, and therefore the control device may immediately control the radiation imaging device 110 to stop scanning in response to switching from receiving the trigger signal from the vehicle body detection device 140 to not receiving the trigger signal from the vehicle body detection device 140.

EXAMPLE III

In the present embodiment, the radiation inspection system has the same structure as that of the embodiment, that is, the radiation inspection system may include a radiation imaging device, a vehicle body detection device, a wheel detection device, and a control device. For the radiation imaging device, the vehicle body detection device, the wheel detection device and the related details, reference may be made to the above related descriptions, which are not repeated herein.

In this embodiment, the control device may control the radiation imaging device to perform radiation inspection on the engine compartment at the front end of the vehicle under the action of the vehicle body detection device and the wheel detection device.

Specifically, the second detection position is located on a side of the detection area (i.e., the radiation inspection position) near the entrance of the inspection passage, and the control device may control the radiation imaging device to emit the radiation beam to the detection area in response to receiving the second trigger signal, and control the radiation imaging device to stop emitting the radiation beam to the detection area in response to receiving the first trigger signal for the first time after receiving the second trigger signal. Therefore, the scanning starting position (or scanning starting time) of the engine compartment can be determined by the vehicle body detection device, and the scanning ending position (or scanning ending time) of the engine compartment can be determined by the wheel detection device, so that the radiation inspection of the engine compartment at the front end of the vehicle can be realized, and the radiation inspection of the front passenger area of the vehicle can be avoided.

To ensure that a position behind the front wheels of the vehicle can be scanned, in response to receiving the first trigger signal for the first time, the control device may control the radiation imaging device to stop emitting the radiation beam to the detection area after delaying for a predetermined time period (which may be referred to as a second predetermined time period for convenience of distinction). Alternatively, the radiation inspection system may further comprise another wheel detection device disposed on a side of the detection region remote from the entrance of the radiation inspection tunnel (i.e. a side of the detection region close to the exit of the radiation inspection tunnel, i.e. an exit side downstream of the detection region), and the control device may control the radiation imaging device to stop emitting the radiation beam to the detection region in response to receiving a first trigger signal from the other wheel detection device.

In addition, this embodiment may be combined with the first and/or second embodiments described above to perform radiation inspection of both the engine compartment at the front end of the vehicle and the trunk at the rear end of the vehicle, without performing radiation inspection of the passenger compartment in the middle section of the vehicle.

FIG. 8A is a scanned image of the vehicle as a whole, which is scanned by radiation; fig. 8B is based on the utility model discloses carry out the radiation scanning image that radiation inspection obtained to the engine compartment of vehicle front end and the trunk of vehicle rear end. Wherein the scanned image of the trunk portion shown in the left portion of fig. 8B is scanned from the wheel center without scanning the rear seat of the vehicle; the scan image of the engine compartment shown in the right portion of fig. 8B is finished behind the front wheels to achieve a complete scan of the engine compartment. Can know through the contrast, get off and carry out the in-process that detects to the vehicle at need not driver and passenger, the utility model discloses can be when guaranteeing passenger car driver and passenger safety, radiate the inspection fast to the engine compartment of vehicle front end and the trunk of vehicle rear end.

Example four

The difference is that the radiation imaging apparatus can provide a plurality of scanning parameters, for example, three scanning parameters, namely, a first scanning parameter, a second scanning parameter and a third scanning parameter, for respectively scanning the front engine compartment, the passenger compartment and the rear trunk of the vehicle. Wherein the first scan parameter is for engine compartment scanning, the second scan parameter is for passenger compartment scanning, and the third scan parameter is for trunk scanning.

Further, the second scan parameter may be a radiation beam at a low dose rate, and/or a second scan range with a radiation beam coverage below a predetermined height; and/or the first scan parameter may be a high dose rate radiation beam, and/or the radiation beam coverage is a first scan range, and the first scan range is greater than the second scan range; and/or the third scan parameter is a high dose rate radiation beam, and/or the radiation beam coverage is a third scan range, and the third scan range is larger than the second scan range. The scanning parameters can ensure that the radiation dose rate to which personnel in the passenger compartment are subjected does not exceed a specified safety limit.

For example, the radiation beam coverage of the second scanning parameter may be to cover only the chassis and below, whereas the radiation beam coverage of the first scanning parameter and the radiation beam coverage of the third scanning parameter may cover up to the vehicle height. Alternatively, the dose rate of the radiation beam of the first scan parameter and the dose rate of the radiation beam of the third scan parameter are both greater than the dose rate of the radiation beam of the second scan parameter.

The control device may control the radiation imaging device to emit the radiation beam to the detection area at the first scan parameter in response to receiving the second trigger signal, and/or the control device may control the radiation imaging device to emit the radiation beam to the detection area at the second scan parameter in response to receiving the first trigger signal a first time after receiving the second trigger signal, and/or the control device may control the radiation imaging device to emit the radiation beam to the detection area at the third scan parameter in response to receiving the first trigger signal again after receiving the first trigger signal a first time.

Optionally, the radiation imaging system may further comprise an attenuation device, and the radiation imaging device may provide the radiation beams with different dose rates under the action of the attenuation device, that is, the control device may control the attenuation device to attenuate the radiation beams emitted by the radiation imaging device to different degrees so as to form the plurality of scanning parameters. The structure of the damping device can be set as desired, and the present invention is not described in detail herein.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A radiation inspection system for radiation inspection of a vehicle traveling along a direction of travel defined by a radiation inspection corridor, the radiation inspection system comprising radiation imaging means, wheel detection means and control means,

the radiation imaging device is used for performing radiation scanning imaging on a vehicle passing through a detection area,

the wheel detection device is used for detecting whether the wheels of the vehicle reach or are about to reach the detection area, and sending a first trigger signal to the control device in response to the detection that the wheels of the vehicle reach or are about to reach the detection area,

the control device is used for controlling the radiation imaging device to emit radiation beams to the detection area in response to receiving the first trigger signal again after receiving the first trigger signal for the first time.

2. The radiation inspection system of claim 1,

the control device is used for controlling the radiation imaging device to emit radiation beams to the detection area when the receiving time interval of two adjacent first trigger signals is smaller than a first threshold value.

3. The radiation inspection system of claim 1, further comprising:

a vehicle body detection device for detecting whether the vehicle body of the vehicle reaches or is about to reach the detection area and sending a second trigger signal to the control device in response to detecting that the vehicle body of the vehicle reaches or is about to reach the detection area,

the control device is used for controlling the radiation imaging device to emit radiation beams to the detection area under the condition that the second trigger signal is received first and then the first trigger signal is received twice after the second trigger signal is received.

4. The radiation inspection system of claim 3,

the wheel detection device is used for detecting whether the wheel of the vehicle reaches a first detection position, the first detection position is located near the detection area, and the distance from the detection area is not more than 500 mm.

5. The radiation inspection system of claim 4,

the wheel detection device is a first correlation sensor, the first correlation sensor comprises a first signal transmitting part and a first signal receiving part, the first signal transmitting part and the first signal receiving part are respectively arranged on two sides of the radiation inspection channel, and the first correlation sensor is used for detecting whether wheels exist in at least one first height position of the first detection position in a first height range in the vertical direction according to whether the first signal receiving part receives signals transmitted by the first signal transmitting part.

6. The radiation inspection system of claim 5,

the first height ranges from 30mm to 150 mm.

7. The radiation inspection system of claim 4,

the wheel detecting device is a pressure sensor for detecting whether the wheel of the vehicle reaches the first detection position based on whether the pressure at the first detection position exceeds a second threshold value.

8. The radiation inspection system of claim 4,

the vehicle body detection device is used for detecting whether a vehicle body of the vehicle reaches a second detection position, wherein the second detection position is the same as the first detection position, or the second detection position is positioned on one side of the first detection position close to an inlet of the radiation inspection channel, or the second detection position is positioned on one side of the first detection position close to an outlet of the radiation inspection channel.

9. The radiation inspection system of claim 8,

in a case where the second detection position is located on a side of the first detection position near an exit of a radiation inspection tunnel, a distance between the second detection position and the first detection position is less than or equal to a third threshold value.

10. The radiation inspection system of claim 8,

the vehicle body detection device is a second correlation sensor, the second correlation sensor comprises a second signal transmitting part and a second signal receiving part, the second signal transmitting part and the second signal receiving part are respectively arranged on two sides of the radiation inspection channel, and the second correlation sensor is used for detecting whether a vehicle body exists in at least one second height position of the second detection position in a second height range in the vertical direction according to whether the second signal receiving part receives signals transmitted by the second signal transmitting part.

11. The radiation inspection system of claim 10,

the second height ranges from 200mm to 1200 mm.

12. The radiation inspection system of claim 8, wherein the vehicle body detection device is: a ground induction coil vehicle detector installed under the ground; or radar vehicle detectors mounted to the sides of the radiation inspection tunnel; or a laser scanner; or a microwave infrared composite radar.

13. The radiation inspection system of claim 8,

in a case where the second detection position is located on a side of the detection area close to an entrance of a radiation inspection channel, the control device is further configured to control the radiation imaging device to stop emitting the radiation beam to the detection area after delaying for a first predetermined time period according to a distance between the second detection position and the detection area in response to switching from receiving the second trigger signal to not receiving the second trigger signal.

14. The radiation inspection system of claim 13,

the control device is further used for controlling the radiation imaging device to stop emitting the radiation beam to the detection area in response to receiving a new second trigger signal within a first preset time length range of the time delay.

15. The radiation inspection system of claim 8,

the second detection position is located at one side of the detection area close to the entrance of the radiation inspection channel, and the control device is further configured to control the radiation imaging device to emit the radiation beam to the detection area in response to receiving the second trigger signal, and to control the radiation imaging device to stop emitting the radiation beam to the detection area in response to receiving the first trigger signal for the first time.

16. The radiation inspection system of claim 15,

in response to the first trigger signal being received for the first time, the control device controls the radiation imaging device to stop emitting the radiation beam to the detection area after delaying for a second predetermined time, or

The radiation inspection system further comprises another wheel detection device disposed on a side of the detection region remote from the entrance of the radiation inspection tunnel, and the control device is configured to control the radiation imaging device to stop emitting the radiation beam to the detection region in response to receiving a first trigger signal from the another wheel detection device.

17. The radiation inspection system of claim 3,

in response to receiving the second trigger signal, the control device controls the radiation imaging device to emit a radiation beam to the detection area with first scan parameters, and/or

In response to receiving the first trigger signal for a first time after receiving the second trigger signal, the control device controls the radiation imaging device to emit radiation beams to the detection area with second scan parameters, and/or

In response to receiving the first trigger signal again after receiving the first trigger signal for the first time, the control device controls the radiation imaging device to emit radiation beams to the detection area at a third scan parameter.

18. The radiation inspection system of claim 17,

the second scanning parameter is a radiation beam with a low dose rate, and/or a second scanning range with a radiation beam coverage below a predetermined height; and/or

The first scanning parameter is a high dose rate radiation beam, and/or the radiation beam coverage is a first scanning range, the first scanning range being greater than the second scanning range; and/or

The third scan parameter is a high dose rate radiation beam, and/or the radiation beam coverage is a third scan range, the third scan range being larger than the second scan range.

19. The radiation inspection system of claim 1,

the control device is further configured to control the radiation imaging device to stop emitting the radiation beam to the detection area after delaying a third predetermined time period from a time when the radiation imaging device is controlled to emit the radiation beam to the detection area.

20. The radiation inspection system of claim 19,

the control device is further configured to control the radiation imaging device to stop emitting the radiation beam to the detection area in response to receiving a new first trigger signal within a third predetermined length of time of the delay.

21. The radiation inspection system of claim 1,

the radiation beam forms a radiation scanning surface having a predetermined angle with a vertical plane perpendicular to the direction of travel, and the radiation scanning surface is inclined to a side near the entrance of the radiation inspection tunnel.

22. The radiation inspection system of claim 21,

the predetermined included angle is less than or equal to 30 °.

23. The radiation inspection system of claim 1, further comprising:

a speed measuring device for detecting the traveling speed of the vehicle along the traveling direction defined by the radiation inspection channel and transmitting the traveling speed to the control device,

the control device is also used for adjusting the scanning parameters of the radiation imaging device according to the travelling speed and/or correcting the scanned image according to the travelling speed.

24. The radiation inspection system of claim 1, further comprising:

and the camera device is used for at least shooting the area where the passenger is located in the vehicle so as to obtain the image data of the area where the passenger is located.

25. A radiation inspection system according to claim 24, wherein said camera means comprises first and second camera means, each of said first and second camera means being disposed on a side of said detection region remote from an entrance to said radiation inspection tunnel, a distance between said first camera means and said detection region being less than a distance between said second camera means and said detection region,

the control device is further used for responding to the situation that the first trigger signal is received again after the first trigger signal is received for the first time, controlling the first camera device to shoot the area where the passengers on the back row of the vehicle are located, and controlling the second camera device to shoot the area where the passengers on the front row of the vehicle are located.

26. The radiation inspection system of claim 24, further comprising:

and the control device is also used for adjusting the position parameters and/or the camera shooting parameters of the camera shooting device according to the vehicle type recognition result.

27. The radiation inspection system of claim 1, further comprising: a license plate recognition device arranged on one side of the detection area far away from the entrance of the radiation inspection channel,

the control device is further used for responding to the first trigger signal received for the first time and controlling the license plate recognition device to recognize the license plate of the vehicle.

28. The radiation inspection system of claim 1, further comprising:

a display device for displaying the radiation scan image and/or information related to the radiation scan image.

29. A radiation inspection system for radiation inspection of a vehicle traveling along a direction of travel defined by a radiation inspection corridor, the radiation inspection system comprising radiation imaging means, body detection means, wheel detection means, and control means,

the wheel detection device is used for detecting whether the wheels of the vehicle reach or are about to reach the detection area and sending a first trigger signal to the control device in response to the detection that the wheels of the vehicle reach or are about to reach the detection area and the detection that the wheels of the vehicle reach or are about to reach the detection area,

the vehicle body detection device is used for detecting whether the vehicle body of the vehicle reaches or is about to reach the detection area and sending a second trigger signal to the control device in response to the detection that the vehicle body of the vehicle reaches or is about to reach the detection area,

the control device is used for responding to the second trigger signal received, controlling the radiation imaging device to emit radiation beams to the detection area, and responding to the first trigger signal received for the first time after the second trigger signal is received, controlling the radiation imaging device to stop emitting the radiation beams to the detection area.

30. A radiation inspection system for radiation inspection of a vehicle traveling along a direction of travel defined by a radiation inspection corridor, the radiation inspection system comprising radiation imaging means, body detection means, wheel detection means, and control means,

the control device is used for: in response to receiving the second trigger signal, controlling the radiation imaging apparatus to emit a radiation beam to the detection area at first scan parameters; and/or in response to receiving the first trigger signal for a first time after receiving the second trigger signal, controlling the radiation imaging apparatus to emit radiation beams to the detection area at a second scan parameter; and/or in response to receiving the first trigger signal again after receiving the first trigger signal for the first time, controlling the radiation imaging apparatus to emit a radiation beam to the detection area at a third scan parameter.