CN110764155A - Self-adaptive security check equipment based on transmission speed change and control method thereof - Google Patents
Self-adaptive security check equipment based on transmission speed change and control method thereof Download PDFInfo
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- CN110764155A CN110764155A CN201911045067.6A CN201911045067A CN110764155A CN 110764155 A CN110764155 A CN 110764155A CN 201911045067 A CN201911045067 A CN 201911045067A CN 110764155 A CN110764155 A CN 110764155A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000007689 inspection Methods 0.000 claims abstract description 53
- 238000005070 sampling Methods 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 230000005855 radiation Effects 0.000 claims description 15
- 230000003044 adaptive effect Effects 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 4
- 230000005865 ionizing radiation Effects 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 6
- 239000002390 adhesive tape Substances 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
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- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
Abstract
The invention discloses a self-adaptive security inspection device based on transmission speed change and a control method thereof, belonging to the field of security inspection. The device comprises a base unit, a scanning unit and a speed measuring component. The base unit is a shell module erected on the conveyor belt; the scanning unit comprises at least one group of ray sources accommodated in the shell module, placed at a preset inclined angle and directed to the conveying belt, a detector arranged on the opposite side of each group of ray sources, and a control module electrically connected with the detector and the ray sources; the speed measuring unit comprises a speed measuring sensor arranged at the inlet/outlet of the shell module. The invention tests the speed of the transmission belt through the two groups of photoelectric sensors arranged on the two sides of the frame, and then adjusts the current of the X-ray machine and controls the sampling frequency of the detection plate through the control module, thereby solving the problem that the existing security inspection equipment cannot automatically react after the speed of the adhesive tape machine changes, so that the imaging of a security inspection system is fuzzy, and even cannot be imaged.
Description
Technical Field
The invention belongs to the field of security inspection, and particularly relates to self-adaptive security inspection equipment based on transmission speed change and a control method thereof.
Background
Along with the increasing severity of the safety situation, more and more occasions requiring installation of security inspection equipment are required, the security inspection equipment is more and more complex, the speed of the adhesive tape on different occasions is not fixed but continuously changed, the X-ray system is required to be capable of rapidly adapting to different occasions, the continuous change of the speed of the adhesive tape is met, the normal use of the security inspection machine is guaranteed, and the traditional X-ray inspection device cannot meet the requirement.
On one hand, the existing security inspection equipment is generally installed by adopting a fixed combination of a security inspection machine and an adhesive tape machine, a transmission device is a part of the security inspection equipment, and cannot be replaced at will, and the adaptation performance is poor; on the other hand, when the speed of the conveying belt changes, the security inspection equipment cannot automatically make corresponding adjustment. For example: at security check places such as subway stations, railway stations and the like, workers can frequently adjust the speed of a conveying belt according to the specific conditions of security check people flow and goods so as to improve the security check efficiency; if, for example, to express delivery letter sorting station, when carrying out the safety inspection to the express delivery, according to the kind of waiting to detect the express delivery article, need reasonable control transmission device's speed. Because the beam-out intensity of an X-ray machine in the security inspection equipment and the sampling frequency of a detection plate are fixed, when the goods pass through the device at an excessively high speed, the imaging of a security inspection system is fuzzy, and even the imaging cannot be performed.
Disclosure of Invention
The purpose of the invention is as follows: there are provided a security inspection apparatus adaptive based on a transmission speed change and a control method thereof to solve the problems involved in the background art described above.
The technical scheme is as follows: a security inspection apparatus that adapts based on transmission speed changes, comprising: the device comprises a base assembly, a scanning unit and a speed measuring assembly.
The basic unit comprises a conveying belt for conveying goods and a shell module erected on the conveying belt.
The scanning unit comprises at least one group of ray sources which are accommodated in the shell module, are placed at a preset inclined angle and are directed to the conveying belt, a beam chopping device arranged at the position of a target outlet of the ray sources, a detector arranged at the opposite side of each group of ray sources, and a control module electrically connected with the detector and the ray sources.
The speed measuring unit comprises a speed measuring sensor arranged at the inlet/outlet of the shell module; and the data signal in the speed measuring sensor is transmitted to the control module.
In a further embodiment, the tachometer sensor is installed at the inlet/outlet of the frame, and is not limited to be disposed inside the frame, but may be disposed on a conveyor belt outside the frame.
In a further embodiment, the conveying belt is one of a belt conveyor, a roller conveyor and a chain plate conveyor or a combination thereof.
In a further embodiment, the housing module comprises a frame with a n-shaped cross section and erected on the conveying belt, and an outer cover plate sleeved outside the frame;
in a further embodiment, the source of radiation is one or a combination of any number of sources of ionizing radiation, such as gamma radiation, X-rays, or radioisotopes.
In a further embodiment, the radiation source comprises an X-ray stand which is arranged in a protruding part at the middle position of one side of the frame and is horizontally aligned with the conveying belt, and an X-ray machine which is fixedly arranged on the X-ray stand and is inclined at a preset angle; the beam chopping device is a collimator fixedly arranged at a light outlet of the X-ray machine.
In a further embodiment, the detector comprises a detection box which is arranged on the frame at one side far away from the X-ray machine and aligned with the X-ray machine, and a plurality of detection plates which are fixedly arranged in the detection box and distributed at a preset angle.
In a further embodiment, the tacho sensor comprises a photosensor generator and a receiver arranged at the frame entrance/exit or on the conveyor belt.
In a further embodiment, lead curtains are arranged at two ends of the frame above the conveyor belt.
In a further embodiment, a shielding box is mounted in the area between the X-ray machine and the detection box.
On the other hand, the control method of the security inspection equipment based on the transmission speed change self-adaption comprises the following steps:
s1, after the security inspection equipment is started, switching to a speed measurement mode, measuring the speed of the transmission belt, and transmitting test data to the control module;
s2, the control module corrects the light intensity of the emergent ray of the ray source and adjusts the sampling frequency of the detector according to the speed information;
and S3, finally, switching to a scanning mode to detect the goods to be detected.
In a further embodiment, the step of S2 further includes the following steps:
s21, calculating the transmission speed of the transmission belt
Wherein the time of passing through the first photoelectric sensorThe time when the second photoelectric sensor passes is
The distance between the two photoelectric sensors is L;
s22, calculating the equivalent width of the detector width projected to the center of the belt as
(ii) a Wherein, the width of the detector is d, and the distance from the target point of the ray source to the center of the belt is d
The distance from the target point of the ray source to the detector is
；
S23, calculating the space frequency of the detector as(ii) a That is, the detector is capable of resolving spatial frequencies of at most
Such that the spatial resolution of the image is not less than the limit value
No further information loss occurs;
s24, the sampling frequency of the detector is alpha times of the spatial frequency, namely, the walking distance of the belt per sampling of the detector is less than or equal to(ii) a Therefore, the sampling frequency of the detectorWherein alpha is a preset constant;
s25, because the detector has the highest sampling frequency
So as to further optimize and obtain a piecewise function, i.e. the sampling frequency of the detector
;
S26, ensuring the radiation dose received by the detector within the unit sampling time to be constant and the X-ray beam intensity to be changed accordingly, wherein the beam intensity at the moment is
Wherein, in the step (A),
in order to be the initial beam-out intensity,
is the initial sampling frequency of the detector;
s27, maximum intensity due to X-ray
So as to further optimize and obtain a piecewise function, namely the intensity of the outgoing beam of the X-ray
。
Has the advantages that: the invention relates to self-adaptive security inspection equipment based on transmission speed change and a control method thereof. Meanwhile, the ray beam intensity and the detector sampling frequency of the security inspection equipment can be automatically adjusted according to the speed of the transmission belt, so that the security inspection equipment is not limited to a traditional belt conveyor matched with the traditional belt conveyor, can be assembled and matched with transmission devices of different types and different transmission speeds for use in places needing to be detected, and is not limited to a fixed assembly mode of the security inspection machine and the belt conveyor.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic cross-sectional structure of the present invention.
Fig. 3 is a schematic diagram of the positions of the speed measuring unit and the scanning unit in the present invention.
FIG. 4 is a schematic view showing the structure of the probe cassette of the present invention.
Fig. 5 is a partially enlarged view of the auxiliary elevating module in the present invention.
Fig. 6 is a schematic diagram of the equivalent width of the detector in the present invention.
The reference signs are: the device comprises a conveying belt 1, a frame 2, an outer cover plate 3, feet 4, rollers 5, an X-ray machine frame 6, an X-ray machine 7, a collimator 8, a detection box 9, a detection plate 10, a control module 11, a photoelectric sensor 12, a lead door curtain 13, a shielding box 14, a support frame 15, a height limiting frame 16, an auxiliary heightening module A, a screw rod 41, a threaded sleeve 42, an adjusting nut 43, a bottom plate 44, a fixing surface 51 and a support surface 52.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
The invention provides a self-adaptive security inspection device based on transmission speed change. The method has the characteristic of strong adaptability, and is characterized in that: the safety inspection equipment can be matched with transmission devices of different types and different transmission speeds for use, is not limited to a traditional belt conveyor matched with the safety inspection equipment, can be assembled and installed at a place needing to be detected, and is not limited to a fixed assembly and installation mode of a safety inspection machine and a belt conveyor. The same, the speed of transmission band can be rationally adjusted according to specific conditions such as security check people's flow and goods type to the user of service, improves security check efficiency, simultaneously, can not appear because of the goods passes through the speed too fast, leads to the problem that security check system formation of image is fuzzy, can't form images even.
The security inspection system is a passing detection system and comprises a basic unit, a scanning unit and a speed measuring unit. The basic unit comprises a conveyor belt 1 for conveying goods and a shell module erected on the conveyor belt 1; the scanning unit comprises at least one group of ray sources accommodated in the shell module, placed at an inclined preset angle and directed to the conveyor belt 1, a beam chopping device arranged at the position of a target outlet of the ray sources, a detector arranged at the opposite side of each group of ray sources, and a control module 11 electrically connected with the detector and the ray sources; the speed measuring unit comprises a speed measuring sensor arranged at the inlet/outlet of the shell module; and the data signal in the speed measuring sensor is transmitted to the control module 11.
It will be appreciated by those skilled in the art that the security apparatus may use a single source scanning mode or a multi-source scanning mode, and in particular, may use a scanning unit that includes a single radiation source, detector, circuitry and control module 11, or may use a scanning unit having multiple radiation sources and detectors that produce multiple independent sets of radiation sources and detectors. More specifically, the radiation source in the present invention may be any number of ionizing radiation sources such as gamma radiation, X-rays, or radioisotopes. Such as X-ray transmission, X-ray backscatter, millimeter waves, terahertz, X-ray CT, and the like. In the invention, preferably, the X-ray transmission is adopted, and the tube voltage of the ray generator is between 80 and 300 KV.
The present invention is directed to various embodiments, the following disclosure being provided to enable one of ordinary skill in the art to practice the invention. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 to 4, a security inspection apparatus adaptive to change based on a transmission speed includes: the device comprises a base unit, a scanning unit and a speed measuring unit.
Wherein, basic subassembly includes: the device comprises a conveying belt 1, a frame 2, an outer cover plate 3 and an auxiliary heightening module A. The conveyor belt 1 is used for conveying goods, and is not limited to a specific conveyor belt 1, and may be any type of conveying device, such as one of a belt conveyor, a roller conveyor, a chain conveyor, or a combination thereof. The frame 2 is erected on the conveyor belt 1, the section of the frame is an n-shaped box body, an outer cover plate 3 is arranged outside the box body, the outer cover plate plays a role of a support, and leakage of X rays can be effectively reduced. An elevation limiting frame 16 is arranged on the conveying belt 1 at the front end of the frame 2 and used for limiting the height of goods and protecting the security inspection equipment.
As a preferable scheme, a plurality of auxiliary elevating modules a are fixedly installed at the bottom of the frame 2 to adjust a height difference between the security inspection apparatus and the conveyor belt 1. As shown in fig. 5, the method specifically includes: the device comprises feet 4, a roller 5 arranged on one side of each foot 4, and a supporting frame 15 consisting of a plurality of fixing section bars. In the actual installation process, the support frames 15 of different models can be reasonably selected according to the height difference between the security inspection equipment and the transmission belt 1. Wherein, lower margin 4 includes: a screw 41, a threaded sleeve 42, an adjusting nut 43, a rubber shock pad and a bottom plate 44. The upper part of the threaded sleeve 42 is fixedly arranged at the bottom of the support frame 15 or the frame 2, and the inner surface of the lower part is provided with internal threads; the upper part of the screw rod 41 is sleeved inside the threaded sleeve 42, the middle part of the screw rod 41 is fixedly provided with an adjusting nut, and the bottom of the screw rod 41 is fixedly provided with a rubber shock pad and a bottom plate 44 which are in contact with a supporting plane. The adjusting nut 43 is adjusted by a wrench or other tool, so that the distance between the supporting plane and the bottom of the supporting frame 15 and the bottom of the frame 2 can be adjusted up and down, and the lifting function is achieved. The fixing surface 51 and the supporting surface 52 of the fixing seat of the roller 5 are perpendicular to each other, the fixing surface 51 is rotatably connected with the supporting frame 15 or the bottom of the frame 2 through a pin shaft, and the supporting surface 52 is rotatably connected with the roller 5 through a pin shaft, so that the roller 5 can roll in multiple directions. When the screw rod 41 and the threaded sleeve 42 are completely overlapped or the ground feet 4 are directly disassembled, the height of the roller 5 is larger than that of the ground feet 4, the roller 5 plays a supporting role, the safety inspection equipment can be moved through the roller 5, and transportation and installation are greatly facilitated. When the threaded rod is partially overlapped with the threaded sleeve 42, the height of the roller 5 is smaller than that of the ground foot 4, and the ground foot 4 plays a supporting role and is used for fixing the security inspection equipment, and meanwhile, the height difference between the security inspection equipment and the transmission band 1 can be finely adjusted.
The scanning unit includes: the X-ray machine comprises an X-ray machine frame 6, an X-ray machine 7, a collimator 8, a detection box 9, a detection plate 10 and a control module 11. The X-ray machine frame 6 is arranged in a protruding part in the middle of one side of the frame 2 and is flush with the transmission belt 1, the X-ray machine 7 is fixedly arranged on the X-ray machine frame 6 in an inclined mode at a preset angle, and a collimator 8 is fixedly arranged at a light outlet of the X-ray machine 7; as shown in fig. 3, a detector, specifically a detection box 9 with an L-shaped cross section, is installed at one side and the top of the X-ray machine 7, and a plurality of detection plates 10 are distributed in the detection box 9 at predetermined angles; the control module 11 is arranged on one side of the X-ray machine 7 and is used for adjusting the current of the X-ray machine 7 and controlling the sampling frequency of the detection plate 10. The imaging process of the scanning unit is as follows: the X-ray machine 7 generates rays, the rays are collimated by the collimator 8 to form a fan-shaped light beam, the fan-shaped light beam penetrates through goods to be detected, light signals are received by the detection plate 10 and converted into electric signals, and the electric signals are transmitted to the computer terminal for analysis and imaging.
As a preferable scheme, lead curtains 13 are arranged at two ends of an inlet and an outlet of the frame 2 above the conveyor belt 1; a shielding box 14 is arranged in the area between the X-ray machine 7 and the detection box 9 on top of the frame 2. The X-ray leakage prevention device is used for preventing X-rays from leaking and ensuring that the X-ray radiation dose around the security inspection device is in an extremely low safety range.
The subassembly that tests the speed includes: two groups of photoelectric sensors 12 arranged on two sides of the frame 2 are used as generators and receivers, and photoelectric data in the photoelectric sensors 12 are transmitted to the control module 11 through electric signals. The speed measuring components are respectively arranged at two ends of an inlet and an outlet of the frame 2, but the lead door curtain 13 is not shielded from the photoelectric sensor 12 generator and the receiver when being brought by goods to be measured. Meanwhile, the belt conveyor is not limited to be arranged on or in the frame 2, and can also be arranged on the conveyor belt 1 outside the frame 2. Because the position of two sets of photoelectric sensing ware 12 is fixed, only need when the same goods that awaits measuring of detection pass through the time difference of two sets of photoelectric sensing ware 12, can calculate the transport speed of goods and transmission band 1, simultaneously, above-mentioned photoelectric sensing ware 12 can compromise the tally function. And then transmits the speed and other photoelectric information to the control module 11.
During transportation and installation, the base unit, the scanning unit, the speed measuring unit or a plurality of components thereof can be assembled together for modularization. For example: hold X-ray machine 7, collimator 8, be fixed in X-ray machine frame 6 and form a whole, as ray source subassembly, detection board 10 and other circuit structure hold, be fixed in as forming a whole, as receiving the subassembly, the frame 2, the section bar of support usefulness in the housing plate 3 and the sealed involution board of usefulness all adopt detachable mode to connect, in the transportation, separate each other, mutually independent, form a plurality of modularization subassemblies, control module 11 and speed measuring unit are as two solitary modularization subassemblies. In the using and installing process, the modular components are simply installed and combined according to the engineering design drawing, and each modular component is electrically connected with the control module 11.
For convenience of understanding the technical scheme of the security inspection equipment which is adaptive based on the change of the transmission speed, the working principle of the security inspection equipment is briefly described as follows: after the security inspection equipment is started, firstly, the security inspection equipment is switched to a speed measurement mode, a standard piece to be tested is placed on the transmission belt 1, the speed measurement is carried out on the transmission belt 1, and test data are transmitted to the control module 11; the control module 11 corrects the current of the X-ray machine 7 according to the speed information, adjusts the light intensity of the X-ray and controls the sampling frequency of the detection plate 10 to be matched with the X-ray; and finally, switching to a scanning mode to detect the goods to be detected.
The more specific control and calculation method is as follows: at time t1After passing through the first photoelectric sensor 12, at the moment
By using the second photo sensor 12 and the distance between the two sets of photo sensors 12 is L, the transmission speed of the transmission belt 1 can be calculated
And transmits the speed information to the control module 11; as shown in FIG. 6, the equivalent width of the projected detector width to the center of the belt is calculated as
(ii) a Wherein, the width of the detector is d, and the distance from the target point of the ray source to the center of the belt is d
The distance from the target point of the ray source to the detector is
(ii) a That is to sayThe detector can resolve the spatial frequency to the spatial frequency of the detector at most
Such that the spatial resolution of the image is not less than the limit value
No further information loss occurs; furthermore, the sampling frequency of the detector should be alpha times the spatial frequency, i.e. the walking distance of the belt per sampling of the detector should be less than or equal to
(ii) a Therefore, the sampling frequency of the detectorWhere alpha is an arbitrary constant, and the sampling frequency of the detector should be 2 times the spatial frequency according to the nyquist criterion, so there is usually alpha =2, but it can be other values; it should be noted that if some degree of distortion is allowed (e.g., in the case of very fast belt speeds), the sampling frequency may be less than the calculated value of the above formula; if higher image detail is required, the sampling frequency can be higher than the calculated value of the formula; since the detectors all have a maximum sampling frequencySo as to further optimize the piecewise function, i.e. the sampling frequency of the detector. When the sampling frequency of the detector is changed, in order to ensure the imaging quality, the radiation dose received by the detector within unit sampling time needs to be ensured to be unchanged, the beam intensity of the X-ray is changed along with the change of the sampling frequency, and the beam intensity at the moment is
Wherein, in the step (A),
in order to be the initial beam-out intensity,
is the initial sampling frequency of the detector; due to the maximum intensity of the X-ray beam
So as to further optimize and obtain a piecewise function, namely the intensity of the outgoing beam of the X-ray。
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (10)
1. A security inspection apparatus adapted based on a change in transmission speed, comprising:
the basic unit comprises a conveying belt for conveying goods and a shell module erected on the conveying belt;
the scanning unit comprises at least one group of ray sources, a beam chopping device, a detector and a control module, wherein the ray sources are accommodated in the shell module, are placed at a preset inclined angle and are directed to the conveying belt;
the speed measuring unit comprises a speed measuring sensor arranged at the inlet/outlet of the shell module; and the data signal in the speed measuring sensor is transmitted to the control module.
2. The self-adaptive security inspection device based on the change of the transmission speed is characterized in that the transmission belt is one or a combination of a belt conveyor, a roller conveyor and a chain plate conveyor; the shell module comprises a frame which is erected on the transmission belt and has an n-shaped section, and an outer cover plate which is sleeved outside the frame.
3. The adaptive security inspection device based on change in transmission speed according to claim 1, wherein the radiation source is one or a combination of any number of ionizing radiation sources of gamma radiation, X-rays, or radioisotopes.
4. The safety inspection device adaptive to change based on the transmission speed according to claim 2, wherein the radiation source comprises an X-ray machine frame which is arranged in a protruding part at the middle position of one side of the frame and is horizontally aligned with the transmission belt, and an X-ray machine which is fixedly arranged on the X-ray machine frame and is inclined at a preset angle; the beam chopping device is a collimator fixedly arranged at a light outlet of the X-ray machine; the detector comprises a detection box which is arranged on a frame far away from one side of the X-ray machine and aligned with the X-ray machine, and a plurality of detection plates which are fixedly arranged in the detection box and distributed at a preset angle.
5. The safety inspection device adaptive based on transmission speed change according to claim 2, wherein the speed sensor is installed at an inlet/outlet of the frame, and is not limited to be disposed inside the frame, and may be disposed on a transmission belt outside the frame.
6. The safety inspection device adaptive based on transmission speed change according to claim 5, wherein the tacho sensor comprises a photo sensor generator and a receiver provided at the frame entrance/exit or on a conveyor belt.
7. The safety inspection device adaptive based on conveying speed change according to claim 2, wherein lead curtains are arranged at two ends of the frame above the conveying belt.
8. The safety inspection device adaptive based on change of transmission speed according to claim 4, wherein a shielding box is installed in the region between the X-ray machine and the detection box.
9. The control method of the security inspection equipment based on the transmission speed change adaptation according to any one of claims 1 to 8, characterized by comprising the steps of:
s1, after the security inspection equipment is started, switching to a speed measurement mode, measuring the speed of the transmission belt, and transmitting test data to the control module;
s2, the control module corrects the light intensity of the emergent ray of the ray source and adjusts the sampling frequency of the detector according to the speed information;
and S3, finally, switching to a scanning mode to detect the goods to be detected.
10. The control method of a security inspection apparatus adaptive to change based on transmission speed according to claim 9, wherein the step of S2 includes the steps of:
s21, calculating the transmission speed of the transmission belt
Wherein the time of passing through the first photoelectric sensor
The time when the second photoelectric sensor passes is
The distance between the two photoelectric sensors is L;
s22, calculating the equivalent width of the detector width projected to the center of the belt as
(ii) a Wherein, the width of the detector is d, and the distance from the target point of the ray source to the center of the belt is d
The distance from the target point of the ray source to the detector is
；
S23, calculating the space frequency of the detector as
(ii) a That is, the detector is capable of resolving spatial frequencies of at most
Such that the spatial resolution of the image is not less than a limit value
No further information loss occurs;
s24, the sampling frequency of the detector is alpha times of the spatial frequency, namely, the walking distance of the belt per sampling of the detector is less than or equal to(ii) a Therefore, the sampling frequency of the detector
Wherein alpha is a preset constant;
s25, because the detector has the highest sampling frequency
So as to further optimize and obtain a piecewise function, i.e. the sampling frequency of the detector
;
S26, ensuring that the radiation dose received by the detector is unchanged within the unit sampling time and the X-ray beam intensity is changed accordingly, wherein the beam intensity at the moment is
Wherein, in the step (A),
in order to be the initial beam-out intensity,
is the initial sampling frequency of the detector;
s27, maximum intensity due to X-ray
So as to further optimize and obtain a piecewise function, namely the intensity of the outgoing beam of the X-ray
。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911045067.6A CN110764155A (en) | 2019-10-30 | 2019-10-30 | Self-adaptive security check equipment based on transmission speed change and control method thereof |
| PCT/CN2020/088830 WO2021082385A1 (en) | 2019-10-30 | 2020-05-06 | Security inspection apparatus capable of adapting to change in conveyance speed, and control method for same |
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| CN201911045067.6A CN110764155A (en) | 2019-10-30 | 2019-10-30 | Self-adaptive security check equipment based on transmission speed change and control method thereof |
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| CN110764155A true CN110764155A (en) | 2020-02-07 |
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| CN111346839A (en) * | 2020-03-12 | 2020-06-30 | 江苏警官学院 | X-ray detection device for dangerous goods |
| CN111382293A (en) * | 2020-03-25 | 2020-07-07 | 浙江大华技术股份有限公司 | Safety inspection control method and safety inspection equipment |
| WO2021082385A1 (en) * | 2019-10-30 | 2021-05-06 | 南京全设智能科技有限公司 | Security inspection apparatus capable of adapting to change in conveyance speed, and control method for same |
| CN113759432A (en) * | 2021-07-20 | 2021-12-07 | 浙江华视智检科技有限公司 | Security check system, data acquisition rate adjusting method and article information detection method |
| CN113884513A (en) * | 2021-08-19 | 2022-01-04 | 浙江华视智检科技有限公司 | Security check machine and cargo detection method |
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| CN113093308B (en) * | 2021-05-08 | 2024-04-16 | 佳都科技集团股份有限公司 | Correction method, device, equipment and storage medium for X-ray baggage inspection equipment |
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| US7486768B2 (en) * | 2002-07-23 | 2009-02-03 | Rapiscan Security Products, Inc. | Self-contained mobile inspection system and method |
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| EP2567267B1 (en) * | 2010-05-05 | 2019-06-26 | Nauchno-Proizvodstvennoe Chastnoe Unitarnoe Predpriyatie ADANI | Cargo and vehicle inspection system |
| US9274065B2 (en) * | 2012-02-08 | 2016-03-01 | Rapiscan Systems, Inc. | High-speed security inspection system |
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| CN107991327B (en) * | 2018-01-05 | 2021-02-09 | 同方威视技术股份有限公司 | Security inspection system and method |
| CN110764155A (en) * | 2019-10-30 | 2020-02-07 | 南京全设智能科技有限公司 | Self-adaptive security check equipment based on transmission speed change and control method thereof |
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2019
- 2019-10-30 CN CN201911045067.6A patent/CN110764155A/en not_active Withdrawn
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021082385A1 (en) * | 2019-10-30 | 2021-05-06 | 南京全设智能科技有限公司 | Security inspection apparatus capable of adapting to change in conveyance speed, and control method for same |
| CN111346839A (en) * | 2020-03-12 | 2020-06-30 | 江苏警官学院 | X-ray detection device for dangerous goods |
| CN111382293A (en) * | 2020-03-25 | 2020-07-07 | 浙江大华技术股份有限公司 | Safety inspection control method and safety inspection equipment |
| CN111382293B (en) * | 2020-03-25 | 2023-04-25 | 浙江大华技术股份有限公司 | Security check control method and security check equipment |
| CN113759432A (en) * | 2021-07-20 | 2021-12-07 | 浙江华视智检科技有限公司 | Security check system, data acquisition rate adjusting method and article information detection method |
| CN113884513A (en) * | 2021-08-19 | 2022-01-04 | 浙江华视智检科技有限公司 | Security check machine and cargo detection method |
| CN113884513B (en) * | 2021-08-19 | 2024-01-30 | 浙江华视智检科技有限公司 | Security check machine and cargo detection method |
| CN117647546A (en) * | 2024-01-29 | 2024-03-05 | 浙江华视智检科技有限公司 | Security check imaging method and related device |
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| Publication number | Publication date |
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| WO2021082385A1 (en) | 2021-05-06 |
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