CN114384597A - High-precision 8-inch photomultiplier based on photoelectric shielding - Google Patents
High-precision 8-inch photomultiplier based on photoelectric shielding Download PDFInfo
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Abstract
The invention discloses a high-precision 8-inch photomultiplier based on photoelectric shielding, which comprises a security check machine and an intelligent detection system, the security check machine is internally provided with a photomultiplier, the intelligent detection system is respectively and electrically connected with the security check machine and the photomultiplier, the security inspection machine is used for detecting logistics packages, the photomultiplier is used for carrying out optical signal enhancement work on X-rays, the front end of the photomultiplier is provided with a light intensity detection module which is used for detecting the light intensity of visible light and X-ray, a photocathode module is arranged at the rear side of the light intensity detection module, a vacuum photoelectric conversion module is arranged at the rear side of the photocathode detection module, the photocathode module is used for exciting photoelectrons from the photocathode to the vacuum photoelectric conversion module when light irradiates the photocathode, and the device solves the problem that the multiplication times cannot be automatically regulated and controlled according to the ray intensity at present.
Description
Technical Field
The invention belongs to the technical field of photomultiplier tubes, and particularly relates to a high-precision 8-inch photomultiplier tube based on photoelectric shielding.
Background
With the continuous advance of photomultiplier technology, more and more logistics security inspection machines emit X-rays to logistics packages, defects or structural differences exist in local areas of objects, attenuation of the objects to the X-rays is changed, transmitted ray intensities of different parts are different, and therefore defects and material distribution in the objects can be judged, and finally the X-rays bombard photomultiplier tubes of the security inspection machines. The photomultiplier amplifies the very weak signal and sends it to the signal processing cabinet for further processing, thus obtaining the image.
The conventional logistics security inspection machine cannot multiply times to different degrees according to the intensity of X-rays in the security inspection process, so that the generated images are blurred, and the phenomenon becomes a problem to be solved urgently by people in the field.
Disclosure of Invention
The invention aims to solve the problems in the prior art by aiming at a high-precision 8-inch photomultiplier tube based on photoelectric shielding of the conventional collecting device.
In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a high accuracy 8 inches photomultiplier based on photoelectric shielding, includes security check machine and intelligent detecting system, its characterized in that: the safety inspection machine is characterized in that a photomultiplier is arranged in the safety inspection machine, the intelligent detection system is respectively electrically connected with the safety inspection machine and the photomultiplier, the safety inspection machine is used for detecting logistics packages, the photomultiplier is used for carrying out optical signal enhancement work on X-rays, a light intensity detection module is arranged at the front end of the photomultiplier, the light intensity detection module is used for detecting the light intensity of visible light and the X-rays, a photocathode module is arranged on the rear side of the light intensity detection module, a vacuum photoelectric conversion module is arranged on the rear side of the photocathode detection module, the photocathode module is used for exciting photoelectrons into the vacuum photoelectric conversion module from a photocathode when light irradiates the photocathode, the vacuum photoelectric conversion module is used for converting the light into photoelectrons, a multiplication module is arranged on the rear side of the vacuum photoelectric conversion module, and the multiplication module is used for multiplying the obtained multiplication through further emission, then the amplified electrons are collected by an anode and output as signals, a telescopic shielding cavity is fixedly arranged on the outer side of the photomultiplier, and the telescopic shielding cavity is connected with an external air source pipeline.
The invention further discloses that the intelligent detection system comprises an intelligent analysis module, a data transmission module, a data receiving module and a control module, wherein the light intensity detection module and the data transmission module are electrically connected with the intelligent analysis module, the data transmission module and the control module are electrically connected with the data receiving module, and the control module is electrically connected with an external air source;
the intelligent analysis module is used for analyzing light intensity data in the light intensity detection module, the data transmission module is used for transmitting data, the data receiving module is used for receiving data, and the control module is used for controlling the running state of an external air source for injecting gas and extracting gas in the telescopic shielding cavity.
The invention further discloses that the intelligent detection system comprises a judgment module, an information transmitting module, an information receiving module and a precise control module, wherein the judgment module is electrically connected with the intelligent analysis module and the information transmitting module;
the judging module is used for judging the intensity of light, the information transmitting module is used for transmitting data in the judging module, the information receiving module is used for receiving the transmitted data, and the fine control module is used for performing high-precision control on an external air source.
The invention further discloses that the intelligent detection system comprises a quick identification module, a data reflection module, a remote port module and a display module, wherein the quick identification module is electrically connected with the intelligent analysis module and the data reflection module;
the rapid identification module is used for rapidly identifying the light intensity, the data reflection module is used for reflecting the identified data to the remote port module, the remote port module is used for receiving the reflected data and reflecting the reflected data to a security inspector, and the display module is used for displaying the reflected data to the security inspector for observation.
The invention further provides that the intelligent detection system comprises the following operation steps:
s1, operating an intelligent detection system;
s2, receiving the visible light and the X-ray by the light intensity detection module to obtain the light intensity;
s3, enabling the light to enter a vacuum photoelectric conversion module through a photocathode module, and finally entering a multiplication module, wherein the multiplication module controls the multiplication times according to the light intensity, and enters S4 when the light intensity of the visible light is higher than a system set value, and enters S5 when the intensity of the transmitted X-rays wrapped by the object flow is extremely strong, otherwise, enters S6;
s4, controlling the running states of the external air source for injecting air into and extracting air from the telescopic shielding cavity by the control module according to the light intensity of the visible light, accurately controlling the time of the external air source entering the telescopic shielding cavity by the fine control module, and then entering S6;
s5, the fast recognition module carries out fast recognition work on the light intensity of the X-ray, the remote port module reflects the light intensity to a security inspector, the security inspector recognizes whether the package is empty or not, and then the process enters S6;
and S6, finishing the security check work, closing the security check machine, and stopping the intelligent detection system.
To further illustrate the present invention, in said S3,
r is the number of times of photoelectrons multiplication by the multiplication module, G is the intensity of X-rays, RIs a systemThe number of times of photoelectrons multiplication by the multiplication module under the X-ray intensity of a single unit, RPole(s)For the maximum multiplication times of the photoelectrons by the multiplication module, the weaker the intensity of the X-rays is, the more the number of times of the photoelectrons is multiplied by the multiplication module is.
In the present invention, in the step S5, when G is used>GIs provided withWhen, GIs provided withFor system setting's X ray intensity, shine on the commodity circulation parcel when X ray, X ray is absorbed by the material parcel, and less by the X ray of weakening, at this moment show that the parcel is inside not to have the object, for empty parcel, carry out quick discernment through quick identification module to light intensity, long-range port module is received and is reflected for the security inspector the data of discernment, and display module shows data and observes and reminds the security inspector, makes the security inspector know that this parcel is empty parcel.
Further explaining the present invention, the S4 includes the following operation steps:
s4.1, the light intensity of visible light is higher than a system set value, the light ray is extremely strong, the photocathode module needs to be protected at the moment, the control module controls the speed of external air entering the telescopic shielding cavity according to the light intensity, and controls the time length between opening and closing of the telescopic shielding cavity;
s4.2, opening the telescopic shielding cavity and closing the telescopic shielding cavity for five times, and feeding back to a security inspector through the remote port module;
and S4.3, controlling the staying running time before the telescopic shielding cavity is opened and closed by the fine control module according to the light intensity of the visible light, wherein the light intensity of the visible light is higher than a system set value.
In the invention, in S4.1 and S4.2, when Q is>QIs provided withWhen Q is the intensity of visible light, QIs provided withThe illumination intensity of the visible light set for the system is large, the larger the illumination intensity of the visible light is, the higher the speed of an external air source entering the telescopic shielding cavity is, the larger the intensity is, the higher the speed of driving the telescopic shielding cavity to block light is, meanwhile, after the telescopic shielding cavity blocks the photocathode module, the telescopic shielding cavity is opened after five seconds, when the illumination intensity of the visible light is sensed again, the telescopic shielding cavity is closed again for ten seconds and then opened again, when the illumination intensity of the visible light is sensed for the third time, fifteen seconds are opened, the rest is done by analogy, and the rest is carried out till more than five times, and the strong light is fed back to a security inspector through the remote port module to irradiate the photocathode module.
The invention further illustrates that in S4.3, when Q is>QIs provided withIn the meantime, the light intensity of the visible light is high, and the photomultiplier is protected,
t is the standby time before the telescopic shielding cavity operates when strong light irradiates the photocathode module, and T isBig (a)The longest standby time t before the telescopic shielding cavity operates when strong light irradiates the photocathode moduleIs a systemThe standby time of the telescopic shielding cavity before operation is shortened when strong light irradiates the photocathode module under the light intensity of single unit of visible light, and the higher the light intensity of the visible light is, the shorter the standby time of the telescopic shielding cavity before operation is shortened when the strong light irradiates the photocathode module.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, an intelligent detection system is adopted, and the number of times of photoelectrons multiplication is increased by the operation of the intelligent detection system, so that the generated signal is stronger, the unclear detected parcel image is prevented, the simpler logistics parcel is, the stronger X-ray transmission is, the fewer times of photoelectrons multiplication are, the operation energy consumption is reduced, and the phenomenon that the judgment of a security inspector on the parcel is influenced by the excessively high brightness of the generated image is avoided.
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 specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic plan view of a photomultiplier tube of the present invention;
FIG. 3 is a schematic flow diagram of the intelligent detection system of the present invention;
FIG. 4 is a schematic diagram of the working flow of the protection multiplier of the intelligent detection system of the present invention;
in the figure: 1. the flexible chamber that shelters from.
Detailed Description
The present invention will be described in further non-limiting detail with reference to the following preferred embodiments and accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides the following technical solutions: a high-precision 8-inch photomultiplier based on photoelectric shielding comprises a security check machine and an intelligent detection system, wherein the security check machine is internally provided with the photomultiplier, the intelligent detection system is respectively and electrically connected with the security check machine and the photomultiplier, the security check machine is used for detecting logistics packages, the photomultiplier is used for carrying out optical signal enhancement work on X-rays, the front end of the photomultiplier is provided with a light intensity detection module used for detecting the light intensity of visible light and the X-rays, the rear side of the light intensity detection module is provided with a photocathode module, the rear side of the photocathode detection module is provided with a vacuum photoelectric conversion module, the photocathode module is used for exciting photoelectrons from a photocathode to the vacuum photoelectric conversion module when the photocathode is irradiated by light, the vacuum photoelectric conversion module is used for converting the light into the photoelectrons, and the rear side of the vacuum photoelectric conversion module is provided with a multiplication module, the multiplication module is used for multiplying the obtained multiplication by further emission, then the amplified electrons are collected by an anode and output as signals, a telescopic shielding cavity 1 is fixedly arranged on the outer side of the photomultiplier, the telescopic shielding cavity 1 is connected with an external gas source pipeline, a security inspector starts the security inspection machine, at the moment, the intelligent detection system is controlled to operate through electric drive, the intelligent detection system controls the operation of the light intensity detection module through electric drive, and controls the quantity and the gas entering speed of external gas entering the telescopic shielding cavity 1 according to light intensity data detected by the light intensity detection module, the telescopic shielding cavity 1 is extended to shield the photocathode module after the gas is injected into the telescopic shielding cavity 1, the telescopic shielding cavity 1 is reopened after the gas is extracted, the security inspection machine emits X rays to irradiate a logistics package, the X rays are wrapped and absorbed by materials and finally bombarded on the photomultiplier, and the light intensity detection module at the front end of the photomultiplier detects the X rays to obtain the light intensity, x-rays enter the photocathode module, the photocathode excites photoelectrons into the vacuum photoelectric conversion module when the light irradiates the photocathode module, the vacuum photoelectric conversion module converts the light rays into the photoelectrons and then enters the multiplication module, the multiplication module obtains multiplication amplification through further emission, then the amplified electrons are collected by an anode to be used as signal output, the more complicated the logistics package is, the weaker the X-ray transmission is, the operation is carried out by an intelligent detection system, the more the number of times of photoelectrons is multiplied, the stronger the generated signal is, the unclear the detected parcel image is prevented, the simpler the logistics parcel is, the stronger the X-ray transmission is, the number of times of multiplying the photoelectrons is less, the operation energy consumption is reduced, the phenomenon that the judgment of a security inspector on the package is influenced due to the fact that the brightness of the generated image is too high is avoided, and the light intensity of visible light is extremely high and can damage the photocathode module when the visible light irradiates on the photocathode module;
the intelligent detection system comprises an intelligent analysis module, a data transmission module, a data receiving module and a control module, wherein the light intensity detection module and the data transmission module are electrically connected with the intelligent analysis module, the data transmission module and the control module are electrically connected with the data receiving module, and the control module is electrically connected with an external air source;
the intelligent analysis module is used for analyzing light intensity data in the light intensity detection module, the data transmission module is used for transmitting data, the data receiving module is used for receiving data, and the control module is used for controlling the running states of an external air source for injecting gas and extracting gas into the telescopic shielding cavity 1;
the intelligent detection system comprises a judgment module, an information transmitting module, an information receiving module and a precise control module, wherein the judgment module is electrically connected with the intelligent analysis module and the information transmitting module;
the judging module is used for judging the intensity of light, the information transmitting module is used for transmitting data in the judging module, the information receiving module is used for receiving the transmitted data, and the fine control module is used for performing high-precision control on an external air source;
the intelligent detection system comprises a quick identification module, a data reflection module, a remote port module and a display module, wherein the quick identification module is electrically connected with the intelligent analysis module and the data reflection module;
the rapid identification module is used for rapidly identifying the light intensity, the data reflection module is used for reflecting the identified data to the remote port module, the remote port module is used for receiving the reflected data and reflecting the reflected data to a security inspector, and the display module is used for displaying the reflected data to the security inspector for observation;
the intelligent detection system comprises the following operation steps:
s1, operating an intelligent detection system;
s2, receiving the visible light and the X-ray by the light intensity detection module to obtain the light intensity;
s3, enabling the light to enter a vacuum photoelectric conversion module through a photocathode module, and finally entering a multiplication module, wherein the multiplication module controls the multiplication times according to the light intensity, and enters S4 when the light intensity of the visible light is higher than a system set value, and enters S5 when the intensity of the transmitted X-rays wrapped by the object flow is extremely strong, otherwise, enters S6;
s4, controlling the running states of the external air source for injecting and extracting air into and from the telescopic shielding cavity 1 by the control module according to the light intensity of the visible light, accurately controlling the time of the external air source entering the telescopic shielding cavity 1 by the fine control module, and then entering S6;
s5, the fast recognition module carries out fast recognition work on the light intensity of the X-ray, the remote port module reflects the light intensity to a security inspector, the security inspector recognizes whether the package is empty or not, and then the process enters S6;
s6, finishing the security check work, closing the security check machine, and stopping the intelligent detection system;
in the step S3, the first step,
r is the number of times of photoelectrons multiplication by the multiplication module, G is the intensity of X-rays, RIs a systemThe number of times of photoelectrons multiplication by the multiplication module under the X-ray intensity of a single unit, RPole(s)The maximum number of times of the multiplication module on photoelectrons is increased, the weaker the X-ray intensity is, the more the number of times of the multiplication module on photoelectrons is, the stronger the X-ray intensity is, the logistics package structure is represented to be simple and easy to transmit, so that the multiplication number of times of the multiplication module on photoelectrons is reduced, the energy consumption of the multiplication module is reduced, the dazzling caused by the higher brightness of the displayed clear image is prevented, the judgment of a security inspector on the logistics package is prevented from being influenced, the lower the X-ray intensity is, the complicated structure of the logistics package is represented to be, the X-ray is not easy to transmit, the multiplication number of times of the multiplication module on photoelectrons is increased, the displayed image of the logistics package is clearer, and the phenomenon that the image cannot be displayed smoothly is avoided;
at S5, when G is present>GIs provided withWhen, GIs provided withSetting X-ray intensity for the system, wherein when the X-ray irradiates the material flow package, the X-ray is absorbed by the material package, and the weakened X-rayThe number of the packages is small, the packages are empty packages, the light intensity is rapidly identified through the rapid identification module, the remote port module receives and reflects the identified data to a security inspector, and the display module displays the data to the security inspector for observation and reminds the security inspector to make the security inspector know that the packages are empty packages;
s4 includes the following operation steps:
s4.1, the light intensity of visible light is higher than a system set value, which indicates that the light is extremely strong, the photocathode module needs to be protected, the control module controls the speed of external air entering the telescopic shielding cavity 1 according to the light intensity, and controls the time length between opening and closing of the telescopic shielding cavity 1;
s4.2, opening the telescopic shielding cavity 1 and then closing the telescopic shielding cavity five times, and feeding back to a security inspector through the remote port module;
s4.3, controlling the staying running time of the telescopic shielding cavity 1 before opening and closing according to the light intensity of the visible light by the fine control module, wherein the light intensity of the visible light is higher than a system set value;
in S4.1 and S4.2, when Q is>QIs provided withWhen Q is the intensity of visible light, QIs provided withThe illumination intensity of the visible light set for the system is larger, the higher the illumination intensity of the visible light is, the higher the speed of an external air source entering the telescopic shielding cavity 1 is, the higher the intensity is, the higher the speed of driving the telescopic shielding cavity 1 to block the light is, meanwhile, after the telescopic shielding cavity blocks the photocathode module, the telescopic shielding cavity is opened after five seconds, when the maximum illumination intensity of the visible light is sensed again, the telescopic shielding cavity is closed again for ten seconds and then opened again, when the maximum illumination intensity of the visible light is sensed for the third time, the telescopic shielding cavity is opened after fifteen seconds, and so on, until more than five times, the security inspector is fed back by operating the remote port module that strong light irradiates the photocathode module, the higher the illumination intensity of the visible light is, the higher the speed of the telescopic shielding cavity 1 blocking the light is made to be, the stronger light is prevented from damaging the photocathode module, the lower the illumination intensity of the visible light is made to be, the slower the speed of the telescopic shielding cavity 1 blocking the light is made to be slower, at the moment, the damage of light to the photocathode module is small, and the photocathode module does not need to be shielded quickly, thereby avoiding the generation of loss and generating gaps caused by excessive quick closing times of the shrinkage shielding cavity,the device has the advantages that light rays are prevented from irradiating the photocathode module from the gap, a security inspector is informed when strong light continuously irradiates the photocathode module, so that the security inspector can protect the photomultiplier and prevent the photomultiplier from being damaged, and when the light rays mistakenly irradiate the photocathode module, the logistics package can be continuously detected, so that the detection work can be smoothly operated;
in S4.3, when Q is>QIs provided withIn the meantime, the light intensity of the visible light is high, and the photomultiplier is protected,
t is the standby time before the telescopic shielding cavity 1 runs when strong light irradiates the photocathode module, and T isBig (a)The longest standby time t before the telescopic shielding cavity 1 runs when strong light irradiates the photocathode moduleIs a systemThe standby time before the telescopic shielding cavity 1 runs when strong light irradiates the photocathode module under the light intensity of single unit of visible light, the higher the light intensity of the visible light is, the shorter the standby time before the telescopic shielding cavity 1 runs when the strong light irradiates the photocathode module is, the higher the light intensity of the visible light is, so that the telescopic shielding cavity 1 can quickly shield the light, the photocathode module is protected in time, the condition that the photocathode module is damaged by the too strong light to cause the unsmooth safety inspection of a safety inspection machine is avoided, meanwhile, the light intensity of the visible light is relatively lower, Q1>Q>Q2，Q1Minimum light bearing intensity, Q, for the photocathode module2For the biggest light bearing intensity of photocathode module, make flexible shelter from chamber 1 and wait for the long time after just blockking the light, can bear the within range at photocathode module and detect the commodity circulation parcel, improve detection efficiency.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions may be made in some technical features thereof, without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a high accuracy 8 inches photomultiplier based on photoelectric shielding, includes security check machine and intelligent detecting system, its characterized in that: the safety inspection machine is characterized in that a photomultiplier is arranged in the safety inspection machine, the intelligent detection system is respectively electrically connected with the safety inspection machine and the photomultiplier, the safety inspection machine is used for detecting logistics packages, the photomultiplier is used for carrying out optical signal enhancement work on X-rays, a light intensity detection module is arranged at the front end of the photomultiplier, the light intensity detection module is used for detecting the light intensity of visible light and the X-rays, a photocathode module is arranged on the rear side of the light intensity detection module, a vacuum photoelectric conversion module is arranged on the rear side of the photocathode detection module, the photocathode module is used for exciting photoelectrons into the vacuum photoelectric conversion module from a photocathode when light irradiates the photocathode, the vacuum photoelectric conversion module is used for converting the light into photoelectrons, a multiplication module is arranged on the rear side of the vacuum photoelectric conversion module, and the multiplication module is used for multiplying the obtained multiplication through further emission, then the amplified electrons are collected by an anode to be used as signal output, a telescopic shielding cavity (1) is fixedly arranged on the outer side of the photomultiplier, and the telescopic shielding cavity (1) is connected with an external air source pipeline.
2. The high-precision 8-inch photomultiplier tube based on a photoelectric shield according to claim 1, wherein: the intelligent detection system comprises an intelligent analysis module, a data transmission module, a data receiving module and a control module, wherein the light intensity detection module and the data transmission module are electrically connected with the intelligent analysis module, the data transmission module and the control module are electrically connected with the data receiving module, and the control module is electrically connected with an external air source;
the intelligent analysis module is used for analyzing light intensity data in the light intensity detection module, the data transmission module is used for transmitting data, the data receiving module is used for receiving data, and the control module is used for controlling the running state of an external air source for injecting gas and extracting gas in the telescopic shielding cavity (1).
3. The high-precision 8-inch photomultiplier tube based on a photoelectric shield according to claim 2, wherein: the intelligent detection system comprises a judgment module, an information transmitting module, an information receiving module and a precision control module, wherein the judgment module is electrically connected with the intelligent analysis module and the information transmitting module, the information receiving module is electrically connected with the information transmitting module and the precision control module, and the precision control module is electrically connected with an external air source;
the judging module is used for judging the intensity of light, the information transmitting module is used for transmitting data in the judging module, the information receiving module is used for receiving the transmitted data, and the fine control module is used for performing high-precision control on an external air source.
4. The high-precision 8-inch photomultiplier tube based on a photoelectric shield of claim 3, wherein: the intelligent detection system comprises a quick identification module, a data reflection module, a remote port module and a display module, wherein the quick identification module is electrically connected with the intelligent analysis module and the data reflection module;
the rapid identification module is used for rapidly identifying the light intensity, the data reflection module is used for reflecting the identified data to the remote port module, the remote port module is used for receiving the reflected data and reflecting the reflected data to a security inspector, and the display module is used for displaying the reflected data to the security inspector for observation.
5. The high-precision 8-inch photomultiplier tube based on a photoelectric shield of claim 4, wherein: the intelligent detection system comprises the following operation steps:
s1, operating an intelligent detection system;
s2, receiving the visible light and the X-ray by the light intensity detection module to obtain the light intensity;
s3, enabling the light to enter a vacuum photoelectric conversion module through a photocathode module, and finally entering a multiplication module, wherein the multiplication module controls the multiplication times according to the light intensity, and enters S4 when the light intensity of the visible light is higher than a system set value, and enters S5 when the intensity of the transmitted X-rays wrapped by the object flow is extremely strong, otherwise, enters S6;
s4, controlling the running states of gas injection and gas extraction in the telescopic shielding cavity (1) by an external gas source through the control module according to the light intensity of the visible light, accurately controlling the time of the external gas source entering the telescopic shielding cavity (1) through the fine control module, and then entering S6;
s5, the fast recognition module carries out fast recognition work on the light intensity of the X-ray, the remote port module reflects the light intensity to a security inspector, the security inspector recognizes whether the package is empty or not, and then the process enters S6;
and S6, finishing the security check work, closing the security check machine, and stopping the intelligent detection system.
6. The high-precision 8-inch photomultiplier tube based on a photoelectric shield of claim 5, wherein: in the step S3, in the step S,
r is the number of times of photoelectrons multiplication by the multiplication module, G is the intensity of X-rays, RIs a systemThe number of times of photoelectrons multiplication by the multiplication module under the X-ray intensity of a single unit, RPole(s)For the maximum multiplication times of the photoelectrons by the multiplication module, the weaker the intensity of the X-rays is, the more the number of times of the photoelectrons is multiplied by the multiplication module is.
7. The photo-shield based high-precision 8-inch photomultiplier tube according to claim 6, wherein: in said S5, when G is>GIs provided withWhen, GIs provided withFor system setting's X ray intensity, shine on the commodity circulation parcel when X ray, X ray is absorbed by the material parcel, and less by the X ray of weakening, at this moment show that the parcel is inside not to have the object, for empty parcel, carry out quick discernment through quick identification module to light intensity, long-range port module is received and is reflected for the security inspector the data of discernment, and display module shows data and observes and reminds the security inspector, makes the security inspector know that this parcel is empty parcel.
8. The photo-shield based high-precision 8-inch photomultiplier tube according to claim 7, wherein: the S4 includes the following operation steps:
s4.1, the light intensity of visible light is higher than a system set value, which indicates that the light is extremely strong, the photocathode module needs to be protected, the control module controls the speed of external air entering the telescopic shielding cavity (1) according to the light intensity, and controls the time for opening and closing the telescopic shielding cavity (1);
s4.2, opening the telescopic shielding cavity (1) and closing the telescopic shielding cavity for five times, and feeding back to a security inspector through the remote port module;
and S4.3, controlling the staying running time before the telescopic shielding cavity (1) is opened and then closed by the fine control module according to the light intensity of the visible light, wherein the light intensity of the visible light is higher than a system set value.
9. The high-precision 8-inch photomultiplier tube based on a photoelectric shield of claim 8, wherein: in said S4.1 and S4.2, when Q is>QIs provided withWhen Q is the intensity of visible light, QIs provided withThe illumination intensity of visible light set for the system is larger, the higher the illumination intensity of the visible light is, the higher the speed and the intensity of an external air source entering the telescopic shielding cavity (1) are, the higher the speed of driving the telescopic shielding cavity (1) to block light is, and meanwhile, after the telescopic shielding cavity blocks the photocathode module, the telescopic shielding cavity is opened after five seconds, and when the system senses the light againAnd when the illumination intensity of the visible light is extremely high, the optical fiber is closed again for ten seconds and then opened again, and when the illumination intensity of the visible light is sensed for the third time, the optical fiber is opened after fifteen seconds, and so on until more than five times, and strong light is fed back to a security inspector to irradiate the photocathode module by operating the remote port module.
10. The high-precision 8-inch photomultiplier tube based on a photoelectric shield of claim 9, wherein: in said S4.3, when Q is>QIs provided withIn the meantime, the light intensity of the visible light is high, and the photomultiplier is protected,
t is the standby time before the telescopic shielding cavity (1) runs when strong light irradiates the photocathode module, and T isBig (a)The longest standby time t before the telescopic shielding cavity (1) runs when strong light irradiates the photocathode moduleIs a systemThe standby time of the telescopic shielding cavity (1) before operation is shortened when strong light irradiates the photocathode module under the light intensity of single unit of visible light, and the standby time of the telescopic shielding cavity (1) before operation is shortened when the strong light irradiates the photocathode module.
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| CN111448481A (en) * | 2017-12-11 | 2020-07-24 | 拉皮斯坎系统股份有限公司 | X-ray tomography inspection system and method |
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| US3808444A (en) * | 1973-01-05 | 1974-04-30 | Westinghouse Electric Corp | X-ray contrast detection system |
| CN111448481A (en) * | 2017-12-11 | 2020-07-24 | 拉皮斯坎系统股份有限公司 | X-ray tomography inspection system and method |
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