CN109682842B - Train checking system and checking method - Google Patents
Train checking system and checking method Download PDFInfo
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- CN109682842B CN109682842B CN201910108229.XA CN201910108229A CN109682842B CN 109682842 B CN109682842 B CN 109682842B CN 201910108229 A CN201910108229 A CN 201910108229A CN 109682842 B CN109682842 B CN 109682842B
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- 238000000034 method Methods 0.000 title claims description 22
- 238000007689 inspection Methods 0.000 claims abstract description 76
- 238000003384 imaging method Methods 0.000 claims abstract description 22
- 230000004223 radioprotective effect Effects 0.000 claims abstract description 5
- 230000005855 radiation Effects 0.000 claims description 38
- 230000003137 locomotive effect Effects 0.000 claims description 19
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/10—Different kinds of radiation or particles
- G01N2223/101—Different kinds of radiation or particles electromagnetic radiation
- G01N2223/1016—X-ray
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Abstract
The invention discloses a train inspection system capable of imaging a train for security inspection by a scanning device, the scanning device comprising an accelerator and a detector, the train inspection system comprising: a first sensor provided in the accelerator for detecting whether or not a train passes by; the second sensor is arranged between the accelerator and the first sensor and can detect whether a train passes through or not; and a controller configured to warm up the accelerator when the first sensor detects a train passing, and to control the accelerator to take out a first dose for safety inspection of the train when the second sensor detects a train passing; wherein the first dose is set to meet radioprotective safety conditions of personnel on the train. The invention can scan the compartments of the train with people on the premise of ensuring the safety of the people on the train.
Description
Technical Field
The invention relates to the field of safety inspection, in particular to a train inspection system and a train inspection method.
Background
As international cargo trade goes on and goes off more frequently, international security problems are becoming more serious, and security inspection systems are increasingly appearing in various cargo distribution sites and transportation hubs, such as customs, airports, wharfs, stations, etc. of various countries.
Wherein the X-ray based inspection system is capable of inspecting and imaging substances contained therein in real time without damaging the surface of the article, and is favored in various security inspection sites due to its high energy, good penetration, safe transportation and no subsequent contamination. However, the high dose of X-rays is easy to damage the human body, and part of the articles to be detected, such as trains, pass through the channel to be detected under the condition that the drivers or the staff operate the articles, so that the safety of the personnel on the trains is ensured, and corresponding avoidance is performed.
The existing X-ray train inspection system adopts a scheme of avoiding locomotives and adjacent boxcars of the locomotives to scan and inspect in order to ensure the radiation safety of personnel on the train. Meanwhile, in order to avoid the problem of slow rise of the accelerator dosage in the scanned image due to high train speed, a scheme of preheating the accelerator in advance before beam output is adopted, so that the dosage of the accelerator is ensured to be stable when beam output is carried out, and the image quality is ensured. The method comprises the following specific steps: when the train is at a certain distance from the main beam, the accelerator is preheated by increasing the voltage and the magnetizing trigger frequency in advance; when the train approaches the beam center line, for example, enters a scanning channel, the preheating magnetic triggering frequency of the accelerator is controlled to be reduced to a certain range so as to ensure the radiation safety of locomotive drivers; when the locomotive and the adjacent 1 carriage pass through the beam center line, the normal magnetic triggering frequency of the accelerator is recovered, and the accelerator is controlled to start beam scanning.
However, the scheme for avoiding the locomotive and the adjacent train carriages of the locomotive is difficult to check the condition that the locomotive and the adjacent train carriages of the locomotive carry smuggle matters and dangerous goods, so that hidden danger is left in safety check; in addition, the high-frequency-low-frequency-high-frequency conversion adopted by the preheating frequency of the accelerator has higher requirements on an Automatic Frequency Control (AFC) motor of the accelerator, and particularly when a train runs at a high speed, the dosage of the accelerator is slowly increased due to the lag of the regulation of the AFC motor, so that the image quality is influenced; in addition, the steps have higher requirements on a control system, and a plurality of sets of sensors and control units are needed, so that the control system is complex and high in cost, and the accelerator is preheated at high frequency due to false alarm of sensor signals easily, and excessive dose of radiation is caused to personnel on a train.
Disclosure of Invention
At least one object of the present invention is to provide a train inspection system and inspection method that can scan for a person's car (locomotive, passenger car and trucks adjacent to the locomotive, passenger car) in a train, while ensuring the safety of personnel on the train. The preferred technical solutions of the technical solutions provided by the present invention can produce a plurality of technical effects described below.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the present invention provides a train inspection system capable of imaging a train for security inspection by a scanning device including an accelerator and a detector, the train inspection system comprising: a first sensor provided in the accelerator for detecting whether or not a train passes by; the second sensor is arranged between the accelerator and the first sensor and can detect whether a train passes through or not; and a controller configured to warm up the accelerator when the first sensor detects a train passing, and to control the accelerator to take out a first dose for safety inspection of the train when the second sensor detects a train passing; wherein the first dose is set to meet radioprotective safety conditions of personnel on the train.
As an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or in the following, the controller is further configured to: and when the accelerator is controlled to emit beams in a first dosage, controlling the beam-emitting frequency of the accelerator to correspond to the running speed of the train.
As an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or in the following, the controller is further configured to: and when the running speed variation of the train is within a set range, controlling the beam-out frequency of the accelerator to be unchanged.
As an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or the following of the present invention, the deformed portion imaged by the train is corrected according to the speed of the train, under the condition that the beam-out frequency of the accelerator is unchanged.
As an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or in the following, the train inspection system further includes: the third sensor is provided in the train direction of the accelerator and can determine the type of the train car.
As an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or in the following, the third sensor includes: the wheelbase sensor can judge the type of the train carriage by collecting the wheelbase of the train carriage; and/or an image sensor capable of determining the type of the railcar by collecting image information of the railcar.
As an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or in the following, the controller is further configured to: based on the judging result of the third sensor, when a carriage which can be scanned normally by the train passes through an accelerator, controlling the accelerator to measure out beams with a second dose, and carrying out safety inspection on the train; wherein the second dose is set free of radiation protection safety conditions for personnel on the train.
As an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or in the following, the controller is further configured to: when the accelerator is controlled to take out beams with a second dose, the beam-out frequency of the accelerator is controlled to correspond to the running speed of the train, and the beam-out frequency of the accelerator is adjusted in real time according to the change of the running speed of the train so as to ensure the imaging quality of the train.
As an optimization of any of the technical solutions or any of the optimized technical solutions provided in the foregoing or in the following, the carriage capable of being scanned normally includes: and the train is not provided with a boxcar adjacent to the passenger car or the locomotive.
As an optimization of any of the technical solutions provided in the foregoing or in the following or any optimized technical solution, in a process of the train from the first sensor to the second sensor, the accelerator can be preheated until the accelerator does not have a dose ramp-up phenomenon at the highest scanning frequency.
The present invention also provides a train inspection method for imaging a train for security inspection by a scanning apparatus including an accelerator and a detector, the train inspection method comprising: causing the accelerator to enter a low frequency preheat mode as the train passes a first sensor; and when the train passes by the second sensor, enabling the accelerator to measure out beams with a first dose, and carrying out safety inspection on the train; wherein the first dose is set such that the beam-out dose of the accelerator meets the radiation protection safety conditions for personnel on the train.
As an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or in the following, the train inspection method includes: judging the type of the train carriage, and controlling the accelerator to measure out beams with a second dose when the carriage which can be scanned normally by the train passes through the accelerator, so as to carry out safety inspection on the train; wherein the second dose is configured such that the beam-out dose of the accelerator is not limited by radiation protection safety conditions of personnel on the train.
Based on the technical scheme, the accelerator beam is emitted by the first dose capable of meeting the radiation protection safety condition of personnel on the train, so that the personnel carriages (locomotives and buses and trucks adjacent to the locomotives and buses) in the train can be scanned on the premise of ensuring the safety of the personnel on the train.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of a layout scheme of a train inspection system according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a train inspection system according to an embodiment of the present invention along a train traveling direction;
fig. 3 is a schematic diagram of a triangle principle similar to the beam output frequency and the train speed of the train inspection system according to the embodiment of the invention.
Reference numerals: 110. the accelerator, 120, detector, 131, first camera, 132, second camera, 133, third camera, 134, fourth camera, 141, first entrance light curtain, 142, second entrance light curtain, 151, first exit light curtain, 152, second exit light curtain, 161, first area laser sensor, 162, second area laser sensor, 163, third area laser sensor, 164, fourth area laser sensor, 165, fifth area laser sensor, 166, sixth area laser sensor, 171, first protective wall, 172, second protective wall, AA', beam center line, S0 (or X0), first sensor, S1 (or X1), second sensor.
Detailed Description
The following description of the invention and the differences between the present invention and the prior art will be understood with reference to the accompanying drawings and text. The following describes the invention in further detail, including preferred embodiments, by way of the accompanying drawings and by way of examples of some alternative embodiments of the invention.
It should be noted that: any technical feature and any technical solution in this embodiment are one or several of various optional technical features or optional technical solutions, and in order to describe brevity, all of the optional technical features and the optional technical solutions of the present invention cannot be exhausted in this document, and it is inconvenient for an implementation of each technical feature to emphasize that it is one of various optional implementations, so those skilled in the art should know: any one of the technical means provided by the invention can be replaced or any two or more of the technical means or technical features provided by the invention can be mutually combined to obtain a new technical scheme.
Any technical features and any technical solutions in the present embodiment do not limit the protection scope of the present invention, and the protection scope of the present invention should include any alternative technical solution that can be conceived by a person skilled in the art without performing creative efforts, and a new technical solution obtained by combining any two or more technical means or technical features provided by the present invention with each other by a person skilled in the art.
The technical scheme provided by the invention is explained in more detail below with reference to the accompanying figures 1-2.
As shown in fig. 1, the present invention provides a train inspection system capable of imaging a train through a scanning device including an accelerator 110 and a detector 120 for performing a security inspection, the train inspection system comprising: a first sensor S0 (or X0) provided in the accelerator 110 and configured to detect whether or not a train passes by; a second sensor S1 (or X1) provided between the accelerator 110 and the first sensor S0 (or X0) and configured to detect whether a train passes or not; and a controller configured to warm up the accelerator 110 when the first sensor S0 (or X0) detects the passing of the train, and to control the accelerator 110 to measure out a beam with a first dose when the second sensor S1 (or X1) detects the passing of the train, and to perform a safety check on the train; wherein the first dose is set to meet radioprotective safety conditions of personnel on the train.
For the safety inspection of the train, the train detection system, including the accelerator 110 and the detector 120, is generally disposed at two sides of the train track, so as to perform radiation imaging on the train passing through the beam-outgoing center plane of the accelerator 110. However, the running direction of the train on the track is forward or reverse, so in order to save the arrangement of the sensors in the train detection system as much as possible, as shown in fig. 1, the sensors are symmetrically arranged along the track with the accelerator 110 and the detector 120 as axes, that is, S0 and X0 are symmetrically arranged in the figure, and S1 and X1 are symmetrically arranged in the figure. For simplicity, the left part of the beam-out center line AA 'is described below, and the right part of the beam-out center line AA' is correspondingly symmetrical.
The train inspection system is centered on an accelerator 110 and a detector 120, and uses the accelerator 110 to emit radiation and receive the radiation from the detector 120, and then processes the imaging to view the interior of the article. The train inspection system can be effectively applied to the process of inspecting the train, as the internal condition of the article can be explored without damaging the surface of the article.
In a train inspection system using X-rays as detection rays, the detection rays can be generated by accelerating electrons to strike a target, and in a train in a running state, the detection rays are required to radiate the train at a certain frequency, and then the train is imaged by radiation detection results at a plurality of moments. Thus, parameters that may affect the radiation dose of the X-rays include the frequency at which the accelerator 110 emits the radiation, the voltage applied by the accelerator 110 when accelerating electrons using an electromagnetic field, and the current at which the electron source generates electrons.
However, since X-rays are found to be harmful to organisms, biological cells can be inhibited, destroyed, or even necrotized, resulting in various degrees of physiological, pathological, and biochemical changes in the body. Therefore, in the process of checking the train carriage provided by the train checking system according to the embodiment of the present invention, it is necessary to strictly control the beam-out dose of the accelerator 110 to meet the radiation protection safety condition of personnel, for example, the dose received by the driver in a single time cannot exceed 0.25 μsv as specified in ANSI/IIPS-N43.17-2009. Thus, although the beam-out dose does not correspond to the dose received by the driver, it is generally necessary to at least control the beam-out dose of the accelerator 110 not to exceed the above-mentioned specifications in order to ensure the radiation protection safety of the driver.
Based on radiation protection safety requirements, the embodiment of the invention sets a first sensor S0 (or X0) for detecting whether a train passes or not, and warms up the accelerator 110 when the train passes through the first sensor S0 (or X0). As the beam-out of the accelerator requires two conditions, one is a microwave magnetic field for accelerating electrons; secondly, the electron source generates electrons under high voltage, and the electrons are accelerated by a microwave magnetic field to perform targeting so as to generate X rays.
Preheating of the accelerator therefore means: an accelerating field is established for the accelerating tube in advance through microwaves, and once electrons are emitted by the electron source, the electrons can be accelerated and targeted to generate X rays. Wherein, the higher the frequency of the microwave, the stronger the energy of the accelerating tube for accelerating electrons. The electron source can not generate electrons before the accelerating tube is not pressurized, but a small amount of free floating electrons still exist in the accelerating tube, and the electron source can be accelerated by a microwave magnetic field in a preheating state to generate a small amount of rays.
Based on this, the microwave frequency for preheating the accelerator must not be too high to generate a radiation dose exceeding the radiation safety requirements due to accelerating free-floating electrons. Accordingly, the microwave frequency for preheating the accelerator should not be too low or even not so as to avoid the phenomenon that in the normal beam-out state, the dose gradually rises due to the time required for the microwave to establish the magnetic field (the dose gradually rises refers to that when the microwave frequency and the current of the electron gun are adjusted simultaneously, the beam-out dose of the accelerator 110 gradually rises slowly from zero, so that deviation occurs in the detection imaging of the object).
When the accelerator 110 is preheated due to the detection result of the first sensor S0 (or X0), the accelerator 110 will take out the beam with the first dose and scan the train under the influence of the detection result of the second sensor S1 (or X1). As mentioned above, the first dose will be strictly controlled so as not to affect the safety of personnel on the train, subject to personnel radiation protection safety conditions. Compared with a related train inspection system, the embodiment of the invention can carry out safety inspection on the carriage with personnel, avoid the possibility of hiding dangerous objects in the carriage, effectively eliminate dead angles of train safety inspection and ensure the comprehensiveness and thoroughness of the safety inspection.
As shown in fig. 2 and 3, as an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or the following, the controller is further configured to: when the accelerator 110 is controlled to measure out a beam at a first dose, the beam-out frequency of the accelerator 110 is controlled to correspond to the traveling speed of the train.
Specifically, when the distance from the target point of the accelerator 110 to the center line of the train is a, the distance from the target point of the accelerator 110 to the detector 120 is b, the train speed is v, the width of the section of the detector 120 is d, the beam-out frequency of the accelerator 110 is f, and the oversampling parameter is K, according to the principle of similar triangle, there will be:
in general, the distance a from the target point of the accelerator 110 to the center line of the train, the distance b from the target point of the accelerator 110 to the detector 120, the width d of the section of the detector 120, and the oversampling parameter K are fixed parameters relative to the same train inspection system, and at this time, the speed v of the train and the beam-out frequency f of the accelerator 110 have a one-to-one correspondence relationship, that is, the speed of the train is proportional to the beam-out frequency of the accelerator 110. In order to ensure that the train can continue to be imaged in the direction of travel at the same distance intervals, it is necessary to ensure that the beam-out frequency of the accelerator 110 increases as the train speed increases, corresponding to the train inspection scenario.
The train detection system provided by the embodiment of the invention can control and regulate the beam-out frequency of the accelerator 110 through the cooperation of the speed sensor and an automatic frequency control (automatic frenquency control-AFC) device. I.e. when the train speed changes, the beam-out frequency of the accelerator 110 is adjusted accordingly to ensure the quality of the radiation imaging and the effect of the security check.
Further, as an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or the following, the controller is further configured to: when the running speed variation of the train is within a set range, the beam-out frequency of the accelerator 110 is controlled to be unchanged.
Although the beam-out frequency of the accelerator 110 should correspond to the speed of travel of the train in order to ensure the effect of radiation imaging, since the first dose is much lower than the normal beam-out dose of the accelerator 110 (typically the first dose is less than 10% of the normal beam-out dose of the accelerator 110), the accelerator 110 at the first dose will be far from its rated power. Therefore, in order to make the beam-out dose of the accelerator 110 as stable as possible, when the running speed variation of the train is within the set range, the train detection system provided by the embodiment of the invention makes the beam-out frequency of the accelerator 110 unchanged, so as to avoid the influence of the lower beam-out dose on the stability of the accelerator 110 as much as possible.
At this time, the setting range of the train running speed variation may be calibrated according to the first dose and the model and type of the accelerator 110, and the setting range is based on that the quality of the radiation imaging is not greatly affected. For example, the beam-out frequency of the accelerator 110 may not be adjusted when the amount of change in the train speed is selected to be within 5% of the maximum speed at which the train is traveling. Of course, the setting range of the train running speed variation amount may be set to a fixed value range, for example, ±15km/h.
Further, as an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or the following description of the present invention, the deformed portion imaged by the train is corrected according to the speed of the train, in the case that the beam-out frequency of the accelerator 110 is unchanged.
The dose measured by the first dose is far lower than the normal value of the beam-out dose of the accelerator 110, and the beam-out frequency of the accelerator 110 is inconvenient under the condition that the train speed is not changed greatly, so that the radiation imaging of the train inspection system provided by the embodiment of the invention under the condition is easy to deform and the like. At this time, in order to ensure that the deformed portion does not affect the determination result of the safety detection, geometric correction may be performed on the image deformed portion of the radiation imaging by an algorithm according to the speed of the train or other influencing factors.
As shown in fig. 1, as an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or the following, the train inspection system further includes: the third sensor is provided in the train direction of the accelerator 110, and can determine the type of the train car. The third sensors may be provided in a plurality or a plurality of groups to ensure accuracy of the judgment of the kind of the train car.
The third sensor includes: the wheelbase sensor can judge the type of the train carriage by collecting the wheelbase of the train carriage; and/or an image sensor capable of determining the type of the railcar by collecting image information of the railcar.
The image sensor may include a first camera, a second camera, a third camera, and a fourth camera, which are respectively disposed at two sides of an entrance direction track and two sides of an exit direction track of the train inspection system, and are correspondingly disposed at two sides of a train of the accelerator 110, so as to obtain multi-angle image information of the train as much as possible, and obtain a detection result of the train carriage type in advance. The wheelbase sensor may be disposed at a position of the first sensor S0 (or X0) correspondingly, for example, may be disposed in a track of a train or beside the track, so as to determine model parameters and functional parameters of the train according to the wheelbase of the train.
Further, as an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or the following, the controller is further configured to: based on the judging result of the third sensor, when the carriage which can be scanned normally by the train passes through the accelerator 110, controlling the accelerator 110 to measure out beams with a second dose, and carrying out safety inspection on the train; wherein the second dose is set free of radiation protection safety conditions for personnel on the train.
For a carriage (a carriage without personnel activities) capable of scanning normally, when the beam-out dose of the accelerator 110 is no longer limited by the radiation protection safety condition of personnel on the train, the second dose can be set as the beam-out dose of the accelerator 110 in the rated working state, so that the accelerator 110 can work in a stable beam-out interval, and the radiation imaging quality of train safety detection is ensured.
As an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or in the following, the controller is further configured to: when the accelerator 110 is controlled to measure out beams with the second dose, the beam-out frequency of the accelerator 110 is controlled to correspond to the running speed of the train, and the beam-out frequency of the accelerator 110 is adjusted in real time according to the change of the running speed of the train so as to ensure the imaging quality of the train.
Since the working state of the accelerator 110 is relatively stable when the beam is emitted at the second dose, the beam emitting frequency of the accelerator 110 can be adjusted according to the running speed of the train, so that the accelerator 110 can be correspondingly adjusted when the running speed of the train changes, and the problems of geometric deformation and the like caused by radiation imaging for train safety inspection are avoided.
As an optimization of any of the technical solutions or any of the optimized technical solutions provided in the foregoing or in the following, the carriage capable of being scanned normally includes: and the train is not provided with a boxcar adjacent to the passenger car or the locomotive.
The carriage range which can be scanned normally and screened by the standard is only a truck, and trucks adjacent to the locomotive or the passenger car are eliminated, so that the radiation dose exceeding the radiation protection safety condition to the carriage which is moved by personnel on the train is further avoided, and the health requirement of the personnel on the train is ensured.
As an optimization of any of the technical solutions provided above or below or any of the optimized technical solutions of the present invention, the accelerator 110 can be preheated until the accelerator 110 does not experience a dose ramp-up phenomenon at the highest scanning frequency during the train from the first sensor S0 (or X0) to the second sensor S1 (or X1).
As shown in fig. 1, the distance from the first sensor S0 (or X0) S0 to the second sensor S1 (or X1) S1 is l+n, which is set so that the accelerator 110 can still be normally warmed up in the highest speed running state of the train, and the beam is emitted at the beam emitting frequency corresponding to the train running speed when the train passes through the beam emitting center. For example, the running speed of a general train is 100km/h to 300km/h, and the warm-up time of the accelerator 110 is usually 6 to 8 seconds, at which time the distance l+n between the first sensor S0 (or X0) S0 and the second sensor S1 (or X1) S1 may be set to be not less than 666m (300 km/h×8s), respectively. Of course, the distance l+n between the first sensor S0 (or X0) S0 and the second sensor S1 (or X1) S1 may be determined according to the model type of the train or the running speed of the track provided by the train inspection system.
Further, the train inspection system provided by the embodiment of the invention further comprises a first protective wall 171 and a second protective wall 172, which are arranged at two sides of the train track and used for blocking or absorbing the radiation rays and protecting the safety of personnel at two sides of the track.
In addition, on the inner sides of the first protective wall 171 and the second protective wall 172, a first area laser sensor 161, a second area laser sensor 162, a third area laser sensor 163, a fourth area laser sensor 164, a fifth area laser sensor 165, and a sixth area laser sensor 166 are respectively provided, so as to measure the speed of the train passing through the train detection system in real time, and the controller can precisely control the beam-out frequency of the accelerator 110 according to the measurement results of the plurality of laser sensors.
The first entrance light curtain 141, the second entrance light curtain 142, the first exit light curtain 151, and the second exit light curtain 152 are correspondingly disposed at the entrance and exit of the inspection channel formed by the first protective wall 171 and the second protective wall 172, so as to further monitor the entrance of the train into the train inspection system, and avoid health hazard to the personnel on the train possibly caused by the scanning and calibration of the air.
The present invention also provides a train inspection method for imaging a train through a scanning apparatus including an accelerator 110 and a detector 120 for security inspection, the train inspection method comprising: causing the accelerator 110 to enter a low frequency preheat mode as the train passes a first sensor S0 (or X0); and causing the accelerator 110 to measure out a beam with a first dose while the train passes by the second sensor S1 (or X1), and performing a safety check on the train; wherein the first dose is set such that the beam-out dose of the accelerator 110 meets the radiation protection safety conditions of personnel on the train.
As an optimization of any one of the technical solutions or any one of the optimized technical solutions provided in the foregoing or in the following, the train inspection method includes: judging the type of the train carriage, and controlling the accelerator 110 to measure out beams with a second dose when the carriage which can be scanned normally by the train passes through the accelerator 110, so as to carry out safety inspection on the train; wherein the second dose is configured such that the beam-out dose of the accelerator 110 is not limited by the radioprotective safety conditions of personnel on the train.
Based on the above technical scheme, the embodiment of the invention can make the accelerator 110 beam out with the first dose capable of meeting the radiation protection safety condition of personnel on the train, so that the personnel carriages (locomotives, buses and trucks adjacent to the locomotives and buses) in the train can be scanned on the premise of ensuring the safety of the personnel on the train, and the risks of smuggling on the carriages with personnel activities and hiding dangerous articles are avoided.
The invention also improves the reliability of the system by simplifying the control scheme of the beam-out frequency of the accelerator 110 and the beam-out dosage of the accelerator 110, and avoids the influence on the working stability of the accelerator 110 caused by frequent high-low-high frequency control conversion of the accelerator 110 by the related train inspection system.
In addition, the accelerator 110 in the embodiment of the invention is always in the radiation protection safety range before the normal beam is emitted, so that the risk of exceeding the radiation dose for locomotive drivers due to high-frequency preheating caused by false alarm of light curtain signals in the process of high-low-high conversion of the beam emitting frequency of the accelerator 110 is avoided.
Any of the above-described embodiments of the present invention disclosed herein, unless otherwise stated, if they disclose a numerical range, then the disclosed numerical range is the preferred numerical range, as will be appreciated by those of skill in the art: the preferred numerical ranges are merely those of the many possible numerical values where technical effects are more pronounced or representative. Since the numerical values are more and cannot be exhausted, only a part of the numerical values are disclosed to illustrate the technical scheme of the invention, and the numerical values listed above should not limit the protection scope of the invention.
If the terms "first," "second," etc. are used herein to define a part, those skilled in the art will recognize that: the use of "first" and "second" is used merely to facilitate distinguishing between components and not otherwise stated, and does not have a special meaning.
Meanwhile, if the above invention discloses or relates to parts or structural members fixedly connected with each other, the fixed connection may be understood as follows unless otherwise stated: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated. Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
In the description of the present invention, if the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are used, the above terms refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present invention and simplifying the description, and do not refer to or suggest that the apparatus, mechanism, component or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present invention.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (11)
1. A train inspection system capable of imaging a train for security inspection by a scanning device, the scanning device including an accelerator and a detector, the train inspection system comprising:
a first sensor provided in the accelerator for detecting whether or not a train passes by;
the second sensor is arranged between the accelerator and the first sensor and can detect whether a train passes through or not; and
a controller configured to warm up the accelerator when the first sensor detects a train passing, and to control the accelerator to take out a first dose for safety inspection of the train when the second sensor detects a train passing;
wherein the first dose is set to meet radioprotective safety conditions of personnel on the train;
the accelerator can be preheated during the train from the first sensor to the second sensor until the accelerator does not experience a dose ramp up at the highest scan frequency.
2. The train inspection system of claim 1, wherein the controller is further configured to:
and when the accelerator is controlled to emit beams in a first dosage, controlling the beam-emitting frequency of the accelerator to correspond to the running speed of the train.
3. The train inspection system of claim 2, wherein the controller is further configured to:
and when the running speed variation of the train is within a set range, controlling the beam-out frequency of the accelerator to be unchanged.
4. A train inspection system according to claim 3 wherein the deformed portion of the train imaging is corrected in accordance with the speed of the train with the beam-out frequency of the accelerator unchanged.
5. The train inspection system of claim 1, further comprising:
the third sensor is provided in the train direction of the accelerator and can determine the type of the train car.
6. The train inspection system of claim 5, wherein the third sensor comprises:
the wheelbase sensor can judge the type of the train carriage by collecting the wheelbase of the train carriage; and/or
The image sensor can judge the type of the train carriage by collecting the image information of the train carriage.
7. The train inspection system of claim 5, wherein the controller is further configured to: based on the judging result of the third sensor, when a carriage which can be scanned normally by the train passes through an accelerator, controlling the accelerator to measure out beams with a second dose, and carrying out safety inspection on the train;
wherein the second dose is set free of radiation protection safety conditions for personnel on the train.
8. The train inspection system of claim 7, wherein the controller is further configured to:
when the accelerator is controlled to take out beams with a second dose, the beam-out frequency of the accelerator is controlled to correspond to the running speed of the train, and the beam-out frequency of the accelerator is adjusted in real time according to the change of the running speed of the train so as to ensure the imaging quality of the train.
9. The train inspection system of claim 7 wherein the normally scannable car comprises: and the train is not provided with a boxcar adjacent to the passenger car or the locomotive.
10. A train inspection method for imaging a train for security inspection by a scanning device, the scanning device including an accelerator and a detector, the train inspection method comprising:
causing the accelerator to enter a low frequency preheat mode as the train passes a first sensor; and
when the train passes through the second sensor, the accelerator is used for measuring the beam by the first dose, and the safety inspection is carried out on the train;
wherein the first dose is set such that the beam-out dose of the accelerator meets radiation protection safety conditions for personnel on the train;
the accelerator can be preheated during the train from the first sensor to the second sensor until the accelerator does not experience a dose ramp up at the highest scan frequency.
11. The train inspection method according to claim 10, characterized in that the train inspection method comprises:
judging the type of the train carriage, and controlling the accelerator to measure out beams with a second dose when the carriage which can be scanned normally by the train passes through the accelerator, so as to carry out safety inspection on the train;
wherein the second dose is configured such that the beam-out dose of the accelerator is not limited by radiation protection safety conditions of personnel on the train.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910108229.XA CN109682842B (en) | 2019-02-03 | 2019-02-03 | Train checking system and checking method |
| PCT/CN2020/073801 WO2020156438A1 (en) | 2019-02-03 | 2020-01-22 | Vehicle safety inspection system and inspection method |
| PL438662A PL438662A1 (en) | 2019-02-03 | 2020-01-22 | Vehicle safety inspection system and inspection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910108229.XA CN109682842B (en) | 2019-02-03 | 2019-02-03 | Train checking system and checking method |
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| Publication Number | Publication Date |
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| CN109682842A CN109682842A (en) | 2019-04-26 |
| CN109682842B true CN109682842B (en) | 2024-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910108229.XA Active CN109682842B (en) | 2019-02-03 | 2019-02-03 | Train checking system and checking method |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN109682842B (en) |
| PL (1) | PL438662A1 (en) |
| WO (1) | WO2020156438A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682842B (en) * | 2019-02-03 | 2024-03-26 | 同方威视技术股份有限公司 | Train checking system and checking method |
| CN113740355B (en) * | 2020-05-29 | 2023-06-20 | 清华大学 | Boundary protection method and system for ray detection robot |
| CN114167506B (en) * | 2020-09-11 | 2023-10-13 | 同方威视技术股份有限公司 | Security check system and method |
| CN114764072A (en) * | 2020-12-31 | 2022-07-19 | 同方威视科技（北京）有限公司 | Vehicle inspection system |
| CN114690256A (en) * | 2020-12-31 | 2022-07-01 | 同方威视技术股份有限公司 | Vehicle inspection method, apparatus, system, and computer-readable storage medium |
| CN113495009B (en) * | 2021-05-24 | 2022-11-04 | 柳州龙燊汽车部件有限公司 | Quality detection method and system for matching manufacturing of carriage |
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| CN202896596U (en) * | 2012-09-26 | 2013-04-24 | 同方威视技术股份有限公司 | Train safety inspection system with improved radiation protection |
| CN109682842B (en) * | 2019-02-03 | 2024-03-26 | 同方威视技术股份有限公司 | Train checking system and checking method |
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2019
- 2019-02-03 CN CN201910108229.XA patent/CN109682842B/en active Active
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- 2020-01-22 WO PCT/CN2020/073801 patent/WO2020156438A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109682842A (en) | 2019-04-26 |
| WO2020156438A1 (en) | 2020-08-06 |
| PL438662A1 (en) | 2022-04-25 |
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