CN113376679A - Vehicle channel type nuclear security system and device - Google Patents
Vehicle channel type nuclear security system and device Download PDFInfo
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- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
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Abstract
The invention discloses a vehicle channel type nuclear security system, which comprises: a first detection section and a software section, the first detection section including: the device comprises a main control module, a detector module and an acquisition module; the main control module is in communication connection with the software part and the signal acquisition module, and the acquisition module performs data transmission with the software part through the main control module; the detector module is electrically connected with the signal acquisition module; the detector module is used for detecting rays and obtaining optical signals, and the detector converts the optical signals into electrical signals and then obtains original electrical signals through amplification; the main control module is used for packing and unpacking data of the acquisition module and the software part; the acquisition module amplifies and conditions the amplified original electric signal to obtain counting rate data; the software part receives the counting rate data through the main control module and obtains the radioactivity information through algorithm processing. The invention is a vehicle channel type nuclear security system and device with high efficiency, high sensitivity, strong timeliness and wide application.
Description
Technical Field
The invention relates to the technical field of nuclear safety systems, in particular to a vehicle channel type nuclear security system and a vehicle channel type nuclear security device.
Background
The current means of coping mainly include radiation detector, use radiation detector through using the inspection personnel, through manual scanning, go to check whether have nuclear radiation in on-vehicle goods and the flow of people. However, the manual detection has the problems of missing detection or low detection efficiency and sensitivity; furthermore, the nuclear radiation emitted by different nuclear materials is also very different, which also results in that a single detection device may only be used for a certain period of time and is therefore only time-sensitive.
Therefore, the technical personnel in the field need to solve the problem of how to provide a vehicle tunnel type nuclear security system and device which has high efficiency, high sensitivity, strong timeliness and wide application.
Disclosure of Invention
In view of this, the invention provides a vehicle channel type nuclear security system and a device, which are suitable for radioactive security detection of passing vehicle cargoes at customs ports, mine entrances and exits and national boundary. In many occasions such as customs import and export, frontier, mine, nuclear power station, isotope application and even emergencies, equipment capable of rapidly identifying radioactive substances is often needed, and the requirement that natural radioactivity and artificial radioactivity can be distinguished when detecting radioactive substances is met.
In order to achieve the purpose, the invention adopts the following technical scheme:
a vehicle on-channel nuclear security system comprising: a first detection portion and a software portion, the first detection portion including: the device comprises a main control module, a detector module and an acquisition module; the main control module is in communication connection with the software part and the signal acquisition module, and the acquisition module performs data transmission with the software part through the main control module; the detector module is electrically connected with the signal acquisition module; the detector module is used for detecting rays and obtaining optical signals, and the detector converts the optical signals into electrical signals and then obtains original electrical signals through amplification; the main control module is used for packing and unpacking the data of the acquisition module and the software part; the acquisition module amplifies and conditions the amplified original electric signal to obtain counting rate data; and the software part receives the counting rate data through a main control module and obtains radioactivity information through algorithm processing.
Furthermore, the invention adopts a background processing algorithm and a radiation recognition algorithm based on the NBR technology, and a set of automatic measuring equipment for quickly and accurately detecting the natural gamma radiation source and the artificial gamma source from the natural background of fluctuation change. The first detection part and the software part are mainly used for capturing a license plate photo firstly after a vehicle enters a channel, identifying the license plate number, starting to measure the radiant quantity and the passing speed of the vehicle, giving a corresponding alarm if the radiant quantity exceeds the standard, displaying the passing speed of the vehicle after the vehicle leaves the channel, allowing the vehicle to pass or preventing the vehicle from passing according to the measurement result, and automatically outputting a measurement report document at the software part according to the requirement, the vehicle channel type nuclear security system provides remote networking service, and a remote computer can log in an existing computer software operation interface through the computer at any place by means of a user name and a password to check the field measurement condition.
Preferably, the main control module is in communication connection with the plurality of acquisition modules.
Furthermore, the main control module realizes the functions of signal packing and unpacking processing, mainly performs signal transfer processing, and performs data interaction processing with the acquisition module and the upper computer. More specifically, the master control module can realize selective communication with the channels of the multi-channel collectors. The main control module is communicated with the software part through an RS485 protocol.
Preferably, the vehicle channel type nuclear security system comprises the following modules: the photon excitation unit, the multiplication unit and the amplification unit; the photon excitation unit is coupled with the multiplication unit through a light guide; the multiplying unit is electrically connected with the amplifying unit;
the photon excitation unit interacts with the ray to generate an optical signal, the optical signal passes through the multiplying unit and generates a first nuclear power signal, and the first nuclear power signal is amplified through the amplifying unit to obtain a second nuclear power signal.
Furthermore, the light guide is made of an optical transparent solid material and is mainly used for connecting the scintillator and the photomultiplier, and the multiplying unit is provided with a black cylindrical metal shell for shielding external light interference; in order to improve the accuracy of the measurement result, dose linear correction is performed on the detector unit, and the correction formula is as follows:
in the formula: d is the corrected dose rate value, k is the conversion factor, CCorrectionIs the corrected total count rate, RiIs the ith weight factor, CiIs the ith track count value.
Preferably, the vehicle channel type nuclear security system comprises: the device comprises a conversion unit, a collection unit, a discrimination unit and a control unit;
the acquisition unit is electrically connected with the conversion unit; the conversion unit is electrically connected with the discrimination unit; the communication between the acquisition unit and the main control module is controlled by the control unit; the acquisition unit receives an original data stream sent by the main control unit and performs DA conversion through the conversion unit to obtain a first data stream;
the discrimination unit receives the first data stream, discriminates and judges the second nuclear power signal and the first data stream to obtain a third nuclear power signal, and performs pulse forming counting on the third nuclear power signal to obtain counting rate data.
Furthermore, the screening threshold of the screening unit is freely set between 0 and 4000KeV, and correspondingly, DA is converted into 0-3V voltage to be adjusted.
Preferably, the first detection part of the vehicle channel type nuclear security system further comprises a sensing module, a monitoring identification module, an audible and visual alarm module, a gate module and a power supply module;
the sensing module, the sound and light alarm module and the gate module are electrically connected with the main control module; the sensor module includes: an infrared emitter and an infrared receiver; the sensor module senses external conditions by using the infrared transmitter and the infrared receiver and sends a level signal to the main control module;
the monitoring and identifying module comprises a high-definition camera and a storage unit, and the high-definition camera is used for carrying out video monitoring and snapshot and obtaining vehicle information data; the storage unit is used for storing the vehicle information data;
the sound and light alarm module receives the radioactivity information to judge and alarm;
the power supply module comprises a high-voltage unit and a low-voltage unit, and the high-voltage unit is electrically connected with the detector module to realize multiplication and collection of optical signals; the low-voltage unit is electrically connected with the main control module and the acquisition unit.
Further, the storage unit may be an enterprise-level hard disk that stores measurement information such as vehicle information data, sensor data, monitoring identification data, and the like, and periodically stores conventional data and information.
Further, setting an alarm threshold value as follows:
wherein A is0The average background of the environment, B is an influence factor; the magnification and energy window are chosen to make a decision using the ratio of the active net count to the root mean square of the background.
Further, when the radiation dose of the detected vehicle exceeds a preset limit value, the sound-light alarm module gives out sound-light warning.
Preferably, also includes; and the gate module is used for controlling vehicle stopping, stopping the vehicle when the radioactive information exceeds the standard, and controlling the telescopic ground piles and the like.
Preferably, the vehicle channel type nuclear security system is characterized in that an analog input temperature sensor is arranged in the acquisition unit and used for monitoring the temperature of the detector module.
Furthermore, when the field instrument detector runs, the software part needs to monitor the running state of the acquisition unit in real time in consideration of the intellectualization of the instrument.
A vehicle on-channel nuclear security device comprising: a software portion, a first detection portion and a second detection portion; the first detection portion includes: the device comprises a detector module, an acquisition module, a power supply module, a sensor module, a communication antenna, a shell and a shell bracket; the detector module, the acquisition module and the power supply module are positioned in the shell, and the shell bracket is positioned on the side surface of the shell and is fixedly connected with the shell; the communication antenna is positioned on the top of the side surface of the shell; the functional body is in communication connection with the software part;
the acquisition module comprises: a collector; the detector module includes: the detector comprises a scintillator detector, a first photomultiplier and a second photomultiplier; the power module includes: a first lithium battery and a second lithium battery; the collector is electrically connected with the scintillator detector; the top end of the scintillator detector is electrically connected with the first photomultiplier, the bottom end of the scintillator detector is electrically connected with the second photomultiplier, the first power supply lithium battery is positioned at the top end of the first multiplier, and the second power supply lithium battery is positioned at the bottom end of the second multiplier;
the second detection part is a mirror image structure of the first detection part; the first detecting portion and the second detecting portion are oppositely mounted.
Furthermore, the background value of the environment is reduced, which is beneficial to measurement, the back of the scintillator detector is shielded by lead with the thickness of at least 5mm except the front surface to be measured, and the front surface to be measured is covered by an aluminum film, thereby not only playing a role of protecting the plastic scintillator, but also playing a role of reducing the background value; the detectors can be combined into different combination modes according to different requirements to realize different functional effects; besides the lithium battery, the power can be supplied by a conventional 220V power supply mode.
Preferably, the first detection device further includes: the sound and light alarm module and the monitoring identification module; the monitoring identification module is positioned on the side surface of the shell; the sound and light alarm module is positioned at the top end of the shell.
Preferably, the scintillator detector comprises three pulse acquisition points.
Furthermore, in the application process of the large-area plastic scintillator detector, the optical path from photons generated by incident particles far away from the light collection point to the light collection point is long, the attenuation of light signals is serious, the light collection efficiency is reduced, and the detection efficiency is reduced.
According to the technical scheme, compared with the prior art, the invention discloses a vehicle channel type nuclear security system and device, which adopt a mode of combining a multi-channel pulse signal acquisition large-area plastic scintillator radiation detector and a coincidence counting algorithm with a spectrum threshold recognition algorithm for detection, improve the detection efficiency and sensitivity, and enable the detection system to quickly respond to weak radioactive substances highly shielded by a vehicle; by adopting a modular design mode of the detector, different numbers of detection modules can be selected to be randomly combined according to different actual purposes and types of detected vehicles so as to achieve different detection sensitivities; the online detection channel is formed by adopting two modes of 220V conventional power supply and lithium battery self-power supply, has certain maneuverability, and can be quickly deployed at vehicle entrances and exits of important places such as expressways, large conference activities and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a nuclear security system framework provided by the present invention;
FIG. 2 is a schematic diagram of a multi-path pulse measurement provided by the present invention;
FIG. 3 is a schematic structural diagram of a nuclear security device provided by the present invention;
FIG. 4 is a schematic diagram of a multi-channel pulse signal acquisition large-area plastic scintillator detector provided by the present invention;
FIG. 5 is a flowchart illustrating a procedure of a nuclear security system according to the present invention;
FIG. 6 is a diagram A showing an overlay of a detection module of the nuclear security system according to the present invention;
FIG. 7 is a diagram B showing an overlay of a detection module of the nuclear security system according to the present invention;
in fig. 3: the device comprises a detector shell 1, a communication antenna 2, a detector bracket 3, a photoelectric sensor 4, an image pickup head 5, a second lithium battery 6, a first lithium battery 10, a first multiplier tube 9, a second multiplier tube 7, a detector 8, an audible and visual alarm 11 and a detection channel 12;
in fig. 4: pulse acquisition points 13, 15, 16 and plastic scintillators 14.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The embodiment of the invention discloses a vehicle channel type nuclear security system, which comprises: a first detection portion and a software portion, the first detection portion including: the device comprises a main control module, a detector module and an acquisition module; the main control module is in communication connection with the software part and the signal acquisition module, and the acquisition module performs data transmission with the software part through the main control module; the detector module is electrically connected with the signal acquisition module; the detector module is used for detecting rays and acquiring an amplified original electric signal; the main control module is used for packing and unpacking the data of the acquisition module and the software part; the acquisition module amplifies and conditions the amplified original electric signal to obtain counting rate data; and the software part receives the counting rate data through a main control module and obtains radioactivity information through algorithm processing.
To further optimize the above technical solution, fig. 1 is a schematic diagram of a nuclear security system framework according to an exemplary embodiment.
In particular, a detector module. The detector mainly has the advantages that when a vehicle with goods passes through a channel of the detector, the detector detects gamma rays, photons are converted into electric signals through the photomultiplier, then the electric signals are amplified and conditioned, the signals are transmitted to the collector module for further processing, the detector is driven by high voltage through the preamplifier circuit, and the detector is processed to reduce the background value of the environment and the photon collection efficiency of the photomultiplier. More specifically, a large-area plastic scintillator detector is a detector that detects ionizing radiation by measuring fluorescence generated by ionization and excitation generated by interaction of a crystal with gamma rays. The whole detector system can be divided into a large-area plastic scintillator, a photomultiplier, a preamplifier, a high-voltage power supply and the like. The large-area plastic scintillator substance interacts with gamma rays to excite photons, the photomultiplier collects the photons through the light guide window, photoelectrons are excited to vacuum by the light cathode, the photoelectrons are further multiplied and amplified under the action of a high-voltage field, then the photoelectrons are converged at the anode to form electrical nuclear signals for output, and the signals are subjected to pre-amplification circuit to output simulated nuclear signals for further processing by the acquisition module. The connection part of the large-area plastic scintillator and the photomultiplier needs to consider the problem of photon collection efficiency, so that the outer cylinder of the photomultiplier is generally protected by a black dark cylinder, and the photon dissipation is prevented to improve the photon collection efficiency. The photomultiplier tube converts weak optical signals of the large-area plastic scintillator, which are guided out by the light, into electrical signals. The gamma ray enters the scintillator, and the scintillator material is ionized or excited under the action corresponding to the crystal of the scintillator, and weak fluorescence with the wavelength in the visible light band is emitted when excited atoms are de-excited. The photomultiplier collects photons to a photocathode of a Photomultiplier (PMT) through a light guide, photoelectrons are emitted from the photocathode, the photoelectrons are multiplied by 10000-1000000000 times in the photomultiplier, dynodes of a common photomultiplier have 10-14 poles, the electron multiplication coefficient of each dynode is 3-6 times, the electron multiplication coefficient of the photomultiplier is (3-6) exp (104) 10000-1000000000, and the electron flow generates an electric signal on an anode load. The scintillator and the photomultiplier are connected and coupled through a light guide, and the light guide is an optically transparent solid material and is mainly used for connecting the scintillator and the photomultiplier. In addition, the photomultiplier should have a metal housing made of a black cylindrical pattern to shield external light interference. The photomultiplier needs about 1000V adjustable high voltage for work, and is used for multiplying photoelectrons, collecting the photoelectrons at the anode and outputting detected nuclear power signals. The high voltage of nuclear security systems sometimes needs to be adjusted to properly lower or raise the count rate when setting the discrimination threshold in a commissioning instrument, one of which is to adjust the high voltage supplied to the detector to properly adjust the collection rate of photoelectrons.
And an acquisition module. Specifically, the nuclear signals output by the detector module are processed and amplified, pulse forming is carried out, pulse counting is converted into counting rate information, and the obtained counting rate value is directly related to the radiation intensity. On the other hand, the counting module is in data communication with the main control module, not only transmits counting rate data to the main control module, but also receives control parameters from the main control module, and controls pulse counting by the parameters. More specifically, FIG. 2 is a schematic diagram illustrating a multi-pulse measurement according to an exemplary embodiment. After the signal is amplified by the pre-amplification circuit of the detector, the signal is continuously subjected to gain amplification once in the collector so that the signal amplitude reaches a sufficient value, the signal passes through the main amplification circuit and then enters two comparators to be respectively compared with a low discrimination threshold and a high discrimination threshold, wherein DAC0 and DAC1 are values of the high and low discrimination thresholds and are converted into analog voltage quantities, then the analog voltage quantities are converted into pulse signals through respective monostable triggers, and the MCU collects and counts pulses.
And a main control module. On one hand, the main control part realizes the input and output of prompt signals, such as the signal input of a speed sensor, and outputs sound-light alarm and gate control; and on the other hand, the data communication function is realized, wherein the data communication function comprises information interaction with the collector and information interaction with an upper PC. The main control system module realizes the functions of signal packing and unpacking processing, mainly performs signal transfer processing, and not only performs data interaction processing with a lower-level collector module, but also performs data interaction processing with an upper computer. The method comprises the steps that channel selection communication with multiple paths of collectors is achieved, only one collector occupies a data communication bus at a certain moment, a main control module firstly sends out a channel selection instruction to the collectors and transmits a discrimination threshold value, and then the main control module receives information flow from the collectors, wherein the information flow comprises a series of information such as the number of the current collector, the measured count rate value and whether the collector module works normally; the speed sensor adopts two groups of infrared correlation tubes and is arranged at the position of the entering channel measuring range and the position of the leaving channel measuring range, and when a vehicle enters and leaves, the speed sensor can transmit a vehicle entering and leaving signal to the main control MCU for packaging; the master control MCU packs information acquired by the acquisition device and input by the speed sensor, transmits the information to the upper PC through an RS485 bus, receives data streams including commands, parameter values and other information from the upper PC, processes the information and respectively transmits the information to the acquisition device and the sound-light alarm and gate control system; and performing algorithm processing on the counting rate in the upper computer software to judge whether the radiation exceeds the standard or not, transmitting corresponding alarm information data to the main control module, analyzing and processing the received data by the main control module, and giving a corresponding alarm prompt according to the result. Including the respective alarm levels of audible and visual alarms and the opening or closing of the gates to allow and prevent the passage of the detected vehicle.
In the software application part, information such as a discrimination threshold and the like is set in upper computer software and is interacted with data information of a main control, so that on one hand, the selection of a collector threshold value and a collector channel of the lower computer are controlled, and on the other hand, counting rate information transmitted by a collector is received and is analyzed and processed. In addition, the upper computer software also integrates the functions of video monitoring and digital identification modules, counting rate spectral line display, vehicle in-out information prompt, gate control modules, historical data extraction and storage, remote control and the like. The upper computer software is a software system which runs when the field master control computer is used for measurement, and carries out a communication protocol with the field instrument through an RS485 bus, and the general actual distance can reach more than 1000 meters. The main functions of the upper computer software comprise parameter setting, video monitoring, license plate recognition, monitoring information prompting, report document printing, historical data storage and viewing, lower computer instrument work control, software networking operation and the like. The information displayed on the interface comprises real-time updating of counting rate spectral lines of a plurality of groups of detector modules, whether a lower computer power module, a video module, a detector module and a speed sensor module work normally or not, information charts of high pressure, temperature, measured background value, high and low discrimination threshold counting rates and the like of the detector, license plate numbers identified by video monitoring and vehicle passing speed display, vehicle in-and-out channel display, alarm information prompt and gate control. Some important functions of the upper computer software are set as follows:
A. and setting a communication interface. The main controller is communicated with the upper computer through a serial port, and data streams can be normally interacted only by setting a correct serial port number and a correct baud rate before normal measurement. After the computer identifies the serial port number, the communication interface setting is selected from menu items of the upper computer software, and the identified serial port number can be set.
B. The most important part of the instrument parameters is the setting of a discrimination threshold, the upper computer software realizes the algorithm processing of the counting rate data so as to rapidly and accurately judge and distinguish the radioactive source, namely the artificial radioactivity and the natural radioactivity, and the value of the discrimination threshold is an important parameter calculated by the algorithm and is the key of the accuracy rate of the system. The screening threshold parameter can be set in the 'configuration detector parameter' of the menu item after the experiment calibration instrument is passed, and the current system adopts two screening thresholds of high and low.
C. In the algorithm processing, a reference coefficient constant is needed, and the constant is corrected and determined in an experiment and directly influences the false alarm rate. This parameter can be adjusted appropriately in the actual measurement if a situation with a high false alarm rate occurs.
D. After measurement, the software system will automatically generate a measurement report document, and a specific file path can be set in the actual operation software so as to modify the document storage path. In actual installation, the distances of the two sets of speed sensors may change, the system for calculating the vehicle passing speed is determined by the relation between the distance and the time, and if the distances are changed and are not set in software, the vehicle passing speed calculation is wrong.
And a sensing module. Specifically, infrared correlation technology is used to prompt the vehicle to enter the channel and leave the channel, so as to calculate the passing speed of the vehicle, the number of passing vehicles and other information. More specifically, the speed sensor module mainly adopts infrared correlation counting, the emitter emits infrared rays, the receiver receives the infrared rays, and when a vehicle passes through the speed sensor module, the infrared rays are blocked, so that level signals of the receiving tube are changed, and the level signals serve as vehicle in-out prompting signals.
And a video monitoring module. Specifically, real-time video monitoring of the channel through the camera is indispensable, and the system requirement can effectively record video information, automatically take a candid photograph of the license plate when needed, and automatically extract the license plate number, so that the output report document is required. More specifically, the functions of video monitoring and picture snapshot can be performed, and license plate recognition can be automatically performed.
And a power supply control module. The power supply module of the system is divided into two parts, wherein one part is to provide 3V, 5V, +12V and-12V low-voltage direct-current power supplies for the collector and the main control module, and the other part is to provide 1000V-1500V adjustable direct-current high voltage for the detector module so as to multiply and collect photoelectrons. More specifically, the power supply module: the stable power supply is a necessary guarantee for the normal work of the instrument, and the direct current power supply required by the system comprises +/-12V, +5V, + 3.3V. The system design adopts the switching power supply used in industry to convert 220V alternating current into 12V direct current, and then the 12V voltage is subjected to subsequent processing to obtain the required +/-12V, 5V, 3.3V and the like. The 5V power supply can be obtained by reducing the voltage of 12V direct current voltage source through the voltage conversion chip LM 2575. The +5V direct-current voltage source passes through the AMS1117-3.0V voltage stabilizer chip and a corresponding peripheral processing circuit to obtain a more stable +3V direct-current voltage source with the precision as high as 1%. The linear voltage stabilizer generally has large internal loss and is easy to generate heating phenomenon, so that a current limiting circuit and overheat protection are generally arranged in the linear voltage stabilizer to prevent the damage of a system circuit caused by overhigh ambient temperature. However, the voltage stability of the conversion output of the linear voltage stabilizing device is good, the ripple is very small, and the reliability is high.
A vehicle on-channel nuclear security device comprising: the device comprises an upper computer, a first detection device and a second detection device; the first detection device includes: the device comprises a functional body, a communication antenna 2, a detector shell 1 and a detector bracket 3; the functional body is positioned in the detector shell 1, and the detector support 3 is positioned on the side surface of the detector shell 1 and is fixedly connected with the detector shell; the communication antenna 2 is positioned at the top of the side surface of the detector shell 1; the functional body is in communication connection with the upper computer;
the functional body includes: the device comprises a scintillator detector 8, a collector, a first photomultiplier 9, a second photomultiplier 7, a first lithium battery 10 and a second lithium battery 6; the collector is electrically connected with the scintillator detector; the top end of the scintillator detector 8 is electrically connected with the first photomultiplier 9, the bottom end of the scintillator detector 8 is electrically connected with the second photomultiplier 7, the first power supply lithium battery 10 is positioned at the top end of the first photomultiplier 9, and the second power supply lithium battery 6 is positioned at the bottom end of the second photomultiplier 7;
the second detection device is a mirror image structure of the first detection device; the photoelectric sensors 4 of the first detection device and the second detection device are opposite to the functional body.
To further optimize the above technical solution, fig. 3 is a schematic diagram of a nuclear security system framework according to an exemplary embodiment.
The video snapshot system firstly takes a picture of a license plate after a vehicle enters a channel, the license plate is recognized, the vehicle enters a range of a speed sensor, the system starts to measure the radiant quantity and the passing speed of the vehicle, if the measured radiant quantity exceeds the standard, corresponding alarm is given, after the vehicle leaves the channel, the passing speed of the vehicle is displayed, the vehicle is released or prevented from passing according to the measurement result, and a measurement report document is automatically output by an upper computer through wireless communication, the system provides remote networking service, and a remote computer can log in a field computer software operation interface through the computer at any place by means of a user name and a password to check the field measurement condition.
FIG. 4 is a schematic diagram illustrating a multi-pulse signal acquisition large area plastic scintillator detector according to an exemplary embodiment. The method comprises three pulse acquisitions, namely a pulse acquisition 13, a pulse acquisition 15 and a pulse acquisition 16. The large-area plastic scintillator 14 mainly generates Compton scattering under the action of gamma rays, and when gamma photons generate Compton scattering with a medium, the emitted photons can be emitted towards all directions, namely the emission angle is changed within the range of 0-180 degrees, and the kinetic energy of scattered electrons is continuously changed within the range of 0-Emax, so that a continuous Compton platform is formed on an energy spectrum. The system adopts a structural mode of multi-path pulse signal acquisition to ensure the receiving efficiency of incident photons and improve the detection sensitivity, and can also adopt two paths or multiple paths to carry out pulse signal acquisition according to the requirement of the detection sensitivity.
The design of the monitoring software is specifically that information such as a discrimination threshold and the like is set in the monitoring software, and data information interaction is carried out with the detection channel, so that on one hand, the threshold value of the detection channel and the selection of the detection channel are controlled, and on the other hand, counting rate information transmitted by the detection channel is received and analyzed. In addition, the monitoring software also realizes the functions of remote control of counting rate spectral line display, historical data extraction and storage, reserved expansion ports and the like. More specifically, FIG. 5 is a flowchart illustrating a nuclear security system program according to an exemplary embodiment. The working process is as follows:
the system is powered on and started, and after all modules are initialized and inspected, the system enters a working state after no problem exists; the method comprises the steps of detecting a detected vehicle, starting data acquisition, then processing and fitting the acquired data, then comparing alarm threshold values, carrying out sound-light alarm when the alarm threshold values exceed the threshold values, recording information, otherwise displaying the detected information through a liquid crystal display, transmitting the detected information to a platform in a wired or wireless mode, and finishing detection.
The design of the detector modules, as shown in fig. 6 and 7, is a nuclear security system detection module overlay a and a nuclear security system detection module overlay B according to an exemplary embodiment. Different numbers of detection modules can be selected according to different actual purposes and detected vehicle types to be combined randomly so as to achieve different detection sensitivities, for example: the small-sized vehicle can be measured, and a single detection module is used for forming a channel; the large truck can be used for measuring the channel formed by overlapping two detection modules so as to achieve the detection area and the sensitivity.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A vehicle tunnel-type nuclear security system, comprising: a first detection portion and a software portion, the first detection portion including: the device comprises a main control module, a detector module and an acquisition module; the main control module is in communication connection with the software part and the signal acquisition module, and the acquisition module performs data transmission with the software part through the main control module; the detector module is electrically connected with the signal acquisition module; the detector module is used for detecting rays and obtaining optical signals, and the detector converts the optical signals into electrical signals and then obtains original electrical signals through amplification; the main control module is used for packing and unpacking the data of the acquisition module and the software part; the acquisition module amplifies and conditions the amplified original electric signal to obtain counting rate data; and the software part receives the counting rate data through a main control module and obtains radioactivity information through algorithm processing.
2. The vehicle channel type nuclear security system according to claim 1, wherein the main control module is in communication connection with a plurality of acquisition modules.
3. The on-board nuclear security system of claim 1, wherein the detector module comprises: the photon excitation unit, the multiplication unit and the amplification unit; the photon excitation unit is coupled with the multiplication unit through a light guide; the multiplying unit is electrically connected with the amplifying unit;
the photon excitation unit interacts with the ray to generate an optical signal, the optical signal passes through the multiplication unit and generates a first nuclear power signal, and the first nuclear power signal is amplified through the amplification unit to obtain a second nuclear power signal.
4. The vehicle on-channel nuclear security system of claim 1, wherein the acquisition module comprises: the device comprises a conversion unit, a collection unit, a discrimination unit and a control unit;
the acquisition unit is electrically connected with the conversion unit; the conversion unit is electrically connected with the discrimination unit; the communication between the acquisition unit and the main control module is controlled by the control unit; the acquisition unit receives an original data stream sent by the main control unit and performs DA conversion through the conversion unit to obtain a first data stream;
the discrimination unit receives the first data stream, discriminates and judges the second nuclear power signal and the first data stream to obtain a third nuclear power signal, and performs pulse forming counting on the third nuclear power signal to obtain counting rate data.
5. The vehicle channel type nuclear security system according to claim 1, wherein the first detection part further comprises a sensing module, a monitoring identification module, an audible and visual alarm module and a power supply module;
the sensing module, the sound and light alarm module and the gate module are electrically connected with the main control module; the sensor module includes: an infrared emitter and an infrared receiver; the sensor module senses external conditions by using the infrared transmitter and the infrared receiver and sends a level signal to the main control module;
the monitoring and identifying module comprises a high-definition camera and a storage unit, and the high-definition camera is used for carrying out video monitoring and snapshot and obtaining vehicle information data; and storing the data in the storage unit;
the sound and light alarm module receives the radioactivity information to judge and alarm;
the power supply module comprises a high-voltage unit and a low-voltage unit, and the high-voltage unit is electrically connected with the detector module to realize multiplication and collection of optical signals; the low-voltage unit is electrically connected with the main control module and the acquisition unit.
6. The vehicle on-channel nuclear security system of claim 4, wherein an analog input temperature sensor is present inside the collection unit for monitoring detector module temperature.
7. A tunnel-type nuclear security device for a vehicle, comprising: a software portion, a first detection portion and a second detection portion; the first detection portion includes: the device comprises a detector module, an acquisition module, a power supply module, a sensor module, a communication antenna, a shell and a shell bracket; the detector module, the acquisition module and the power supply module are positioned in the shell, and the shell bracket is positioned on the side surface of the shell and is fixedly connected with the shell; the communication antenna is positioned on the top of the side surface of the shell; the functional body is in communication connection with the software part;
the acquisition module comprises: a collector; the detector module includes: the detector comprises a scintillator detector, a first photomultiplier and a second photomultiplier; the power module includes: a first lithium battery and a second lithium battery; the collector is electrically connected with the scintillator detector; the top end of the scintillator detector is electrically connected with the first photomultiplier, the bottom end of the scintillator detector is electrically connected with the second photomultiplier, the first power supply lithium battery is positioned at the top end of the first multiplier, and the second power supply lithium battery is positioned at the bottom end of the second multiplier;
the second detection part is a mirror image structure of the first detection part; the first detecting portion and the second detecting portion are oppositely mounted.
8. The on-board nuclear security device of claim 7, wherein the first detection device further comprises: the sound and light alarm module and the monitoring identification module; the monitoring identification module is positioned on the side surface of the shell; the sound and light alarm module is positioned at the top end of the shell.
9. The vehicle on-channel nuclear security device of claim 7, wherein the scintillator detector comprises three pulse acquisition points.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116859438A (en) * | 2023-06-29 | 2023-10-10 | 黑龙江省原子能研究院 | Instantaneous weak radiation signal detection device and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116859438A (en) * | 2023-06-29 | 2023-10-10 | 黑龙江省原子能研究院 | Instantaneous weak radiation signal detection device and method thereof |
| CN116859438B (en) * | 2023-06-29 | 2024-06-11 | 黑龙江省原子能研究院 | Instantaneous weak radiation signal detection device and method thereof |
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