Wireless personal electronic dosimeter based on near field communication assisted positioning and positioning method

Abstract

The application provides a wireless personal electronic dosimeter based on near field communication assisted positioning and a positioning method, and relates to the technical field of electronic dosimeters. A label deployment module acquires a basic layout for visualizing a staff position; a positioning trajectory generation module acquires a staff motion trajectory; a dose monitoring module collects real-time radiation dose data received by the staff; an information display module aligns the staff motion trajectory with the time sequence of the real-time radiation dose data and performs visual display; and a dose warning module is used for judging whether the radiation dose of the environment in which the staff is located exceeds a safe range, and if so, radiation warning is performed. The absolute position calibration of the near field communication physical label solves the floor misjudgment problem of traditional wireless positioning, improves positioning accuracy, realizes visual display of the staff position through label and map fusion display, and realizes fine management and control of radiation exposure through acquisition of position-dose dual information.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic dosimeter, and particularly to a wireless personal electronic dosimeter based on near field communication assisted positioning and a positioning method. BACKGROUND

[0002] As a portable device for real-time monitoring and recording of personnel exposure to ionizing radiation, the electronic personal dosimeter is of great importance to the supervision of personal dose information of workers in radiation environment and the protection of personnel safety.

[0003] The conventional electronic personal dosimeter can only read the cumulative dose data after work, and the radiation protection personnel cannot monitor the radiation dose and specific position of the workers in real time. Although some devices with wireless positioning function have been put into use, in the complex environment of nuclear power plants, the deployment points of base stations are strictly limited, the electromagnetic signals are easily disturbed by metal structures, the positioning accuracy is poor, and the positioning error may occur across rooms or floors. If the positioning accuracy is improved by adding base stations, the plant structure needs to be changed on a large scale, which not only has great difficulty in implementation, but also may affect the normal operation of the nuclear power plant. SUMMARY

[0004] The present application provides a wireless personal electronic dosimeter based on near field communication assisted positioning and a positioning method to solve the defects in the prior art.

[0005] In one aspect, the present application provides a wireless personal electronic dosimeter based on near field communication assisted positioning, comprising:

[0006] A tag deployment module is configured to establish a radiation control area position coding database and associate a plant floor plan.

[0007] A positioning trajectory generation module is configured to obtain initial position information and real-time position information of the worker during the movement, and correct the position information by using the near field communication tag information to obtain the personnel movement trajectory.

[0008] A dose monitoring module is configured to perform real-time radiation dose monitoring on the worker and collect real-time radiation dose data received by the worker.

[0009] An information display module is configured to align the time sequence of the personnel movement trajectory and the real-time radiation dose data, and visually display on the basic layout.

[0010] A dose warning module is configured to perform real-time analysis on the visual display result, determine whether the radiation dose of the environment where the worker is located exceeds the safety range according to the preset safety radiation dose threshold, and perform radiation warning if the safety range is exceeded.

[0011] The process of establishing the position coding database of the radiation control area comprises:

[0012] A unique code is assigned to each near field communication technology tag pasted on a key path node of the radiation control area, an entrance of a room, and a key operation area, the unique code representing specific position information of the tag, the specific position information comprising a floor number, a room number, and a specific path number.

[0013] The tag code is stored in association with the corresponding position information to form a preliminary position information set.

[0014] The preliminary position information set is subjected to data cleaning processing to obtain a processed position information set.

[0015] The processed position information set is stored by using a distributed hash table technology to obtain a complete position coding database.

[0016] The process of associating the factory plan map comprises:

[0017] The factory plan map is obtained, and the map is subjected to coordinate grid processing, each grid corresponding to a specific coordinate range.

[0018] The position information of each tag is extracted from the position coding database and converted into corresponding map grid coordinates.

[0019] The grid coordinates of the tags are superimposed on the factory plan map by using a geographic information system technology to establish a corresponding relationship between the tag positions and specific points on the map.

[0020] The superimposed result is calibrated and optimized by using an image recognition and matching algorithm, and the position coding database and the factory plan map are associated.

[0021] The process of obtaining initial position information of the operation personnel comprises:

[0022] When the operation personnel passes through the entrance of the radiation control area, a near field communication induction chip built in the dose meter is automatically activated to establish a communication connection with a near field communication tag at the entrance.

[0023] The near field communication tag sends a data packet to the dose meter, the data packet comprising a self code and position information.

[0024] The dose meter receives the data packet and performs decoding and verification.

[0025] The decoded position information is stored as the initial position information of the operation personnel.

[0026] The wireless personal electronic dosimeter based on near field communication assisted positioning provided by the application, the process of obtaining real-time position information of the worker during the travel includes:

[0027] The dosimeter continuously scans the surrounding near field communication signal during the travel of the worker, and triggers the data collection program when a new near field communication tag signal is detected.

[0028] The internal clock of the dosimeter records the time when the tag is detected.

[0029] The encoding information of the newly detected near field communication tag is read, and the corresponding point information is obtained by querying the location coding database.

[0030] The time and point data are encrypted, and the encrypted data are uploaded to update the real-time position information of the worker.

[0031] The wireless personal electronic dosimeter based on near field communication assisted positioning provided by the application, the process of correcting the position information by using the near field communication tag information includes:

[0032] The position information of the worker is obtained by using a long-distance communication network.

[0033] The Kalman filter algorithm is used to fuse the position information and the real-time position information to obtain the fused position information.

[0034] The fused position information is compared with the near field communication tag position distribution to determine whether there is a position deviation, and if there is a deviation, the regression analysis method in machine learning is used to dynamically correct the position information combined with historical position data and environmental factors.

[0035] The corrected position information is connected in time sequence to obtain the personnel motion trajectory.

[0036] The wireless personal electronic dosimeter based on near field communication assisted positioning provided by the application, the process of collecting real-time radiation dose data received by the worker includes:

[0037] The dosimeter is provided with a radiation sensor, and the radiation sensor is used to sense the radiation dose in the surrounding environment in real time.

[0038] The radiation sensor converts the sensed radiation signal into an electrical signal, and converts the electrical signal into a digital signal through an analog-to-digital converter.

[0039] The microprocessor inside the dosimeter uses integral algorithm to process and analyze the digital signal, and calculates the cumulative radiation dose received by the worker in a preset time period.

[0040] The calculated radiation dose data is encrypted and stored by using a blockchain technology to obtain real-time radiation dose data.

[0041] The wireless personal electronic dosimeter based on near field communication assisted positioning provided by the application aligns the personnel motion trajectory with the time sequence of the real-time radiation dose data, and the process includes:

[0042] Personnel motion trajectory data and real-time radiation dose data are obtained respectively, and the personnel motion trajectory data and real-time radiation dose data contain corresponding time stamps.

[0043] The time stamps of the two kinds of data are calibrated by using a time synchronization algorithm.

[0044] According to the calibrated time stamps, the personnel motion trajectory data and the real-time radiation dose data are sorted in chronological order.

[0045] By using an interpolation algorithm, the missing data points in the time sequence are supplemented, so that the personnel motion trajectory and the real-time radiation dose data are aligned in the time sequence.

[0046] The wireless personal electronic dosimeter based on near field communication assisted positioning provided by the application includes the process of visualizing display on the basis layout:

[0047] The associated plant plan map is three-dimensionally modeled by using WebGL technology to generate a virtual plant environment.

[0048] The aligned personnel motion trajectory data and real-time radiation dose data are loaded into the virtual plant environment, and the personnel motion trajectories with different radiation dose values are rendered by using different colors and transparencies.

[0049] In another aspect, the application provides a wireless personal electronic dosimeter positioning method, which includes:

[0050] When the worker passes through the entrance of the radiation control area, the dosimeter interacts with the near field communication tag at the entrance to obtain the initial position signal.

[0051] During the journey, when a new near field communication tag is detected, the time and point data are uploaded to the management system to update the position information.

[0052] The management system corrects the position information calculated by using the long-distance communication network by using the near field communication tag information to obtain the personnel motion trajectory.

[0053] The dose management system aligns the positioning data with the time sequence of the dose data, and visualizes the personnel motion trajectory and dose information in the plant plan map.

[0054] This invention provides a wireless personal electronic dosimeter and positioning method based on near-field communication (NFC) assisted positioning. It combines NFC technology with personnel positioning needs to form a unique technical solution. The system initially determines a person's location via a wireless network, then verifies the positioning accuracy using contact-type NFC tags, avoiding positioning errors caused by relying solely on signal strength. Utilizing the short-range characteristics of NFC, it physically avoids interference from complex environments on long-range wireless signals. Cross-validation between wireless positioning data and the pre-set location code on the NFC tags improves positioning accuracy. NFC tags can be directly affixed to existing equipment surfaces, simplifying deployment without downtime or modifications; deployment costs are low, and the tags are reusable; positioning is reliable, suitable for the specific needs of the nuclear industry, and possesses practical application potential. Employing a dual mechanism of initial wireless network positioning and NFC-assisted positioning eliminates the need for large-scale construction of communication base stations, significantly reducing deployment difficulty and cost. In areas with severe signal attenuation, the short-range characteristics of NFC enable room-level positioning, effectively avoiding positioning errors across rooms or floors, making it suitable for complex environments such as nuclear power plants. By using near-field communication physical tags for absolute location calibration, the problem of misjudgment of floors in traditional wireless positioning is solved, thus improving positioning accuracy; by integrating tags with maps for display, the location of personnel can be visualized; and by acquiring both location and dose information, refined management of radiation exposure can be achieved. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0056] Figure 1 This is a schematic diagram of the structure of a wireless personal electronic dosimeter based on near-field communication-assisted positioning provided in an embodiment of the present invention;

[0057] Figure 2 This is a flowchart illustrating the process of creating a floor plan of the associated factory in an embodiment of the present invention;

[0058] Figure 3 This is a flowchart illustrating a wireless personal electronic dosimeter positioning method provided in an embodiment of the present invention. Detailed Implementation

[0059] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0060] The present application will be described below in connection with the drawings. Figures 1-3 A wireless personal electronic dosimeter and a positioning method based on near field communication assisted positioning are described.

[0061] Figure 1 FIG. 1 is a structural schematic diagram of a wireless personal electronic dosimeter based on near field communication assisted positioning provided by an embodiment of the present application.

[0062] As shown in FIG. 1, the wireless personal electronic dosimeter based on near field communication assisted positioning provided by the embodiment of the present application and the positioning method based on near field communication assisted positioning can be executed by the wireless personal electronic dosimeter based on near field communication assisted positioning, which includes a tag deployment module, a positioning trajectory generation module, a dose monitoring module, an information display module and a dose warning module. Figure 1 The tag deployment module is used to establish a radiation control area position coding database and associate a factory floor plan map to obtain a basic layout for visualizing a personnel position.

[0063] The process of establishing the radiation control area position coding database includes:

[0064] A unique code is assigned to each near field communication technology tag pasted on a key path node of a radiation control area, an entrance of a room and a key operation area, and the unique code represents specific position information of the tag, and the specific position information includes a floor number, a room number and a specific path number.

[0065] The tag code is associated with the corresponding position information and stored to form a preliminary position information set.

[0066] The preliminary position information set is subjected to data cleaning processing to obtain a processed position information set.

[0067] The distributed hash table technology is used to store the processed position information set to obtain a complete position coding database.

[0068]

[0069] ​Each near field communication technology tag pasted on the key path node of the radiation control area, the room entrance and the key operation area is assigned a unique code, for example, a radiation control area has a multi-storey building, a tag is located on the passage 1 of the room 205 on the 3rd floor, the tag can be assigned a code such as F3R205P01, wherein F3 represents the 3rd floor, R205 represents the room 205, and P01 represents the passage 1.

[0070] A data table is created using a database management system, which contains two fields, one for storing tag codes and the other for storing corresponding location information.

[0071] The preliminary location information set is subjected to data cleaning to remove duplicate, erroneous or incomplete data, improve data quality and obtain a processed location information set.

[0072] The processing content includes:

[0073] Duplicate data removal: check whether there are the same tag codes or location information records in the data, and only keep one if there are.

[0074] Error data checking: verify whether the format of the location information is correct, for example, whether the floor is a valid number, whether the room number meets the rules, etc.

[0075] Missing data supplement: if some location information is missing, try to supplement it through other ways, or mark these records as to be processed.

[0076] The processed location information set is stored using distributed hash table technology to obtain a complete location code database. Distributed hash table technology can store data on multiple nodes to improve data scalability and fault tolerance.

[0077] Figure 2 is a process diagram for associating a factory floor plan in an embodiment of the present application.

[0078] As shown in Figure 2 , the process of associating a factory floor plan includes:

[0079] Obtain the factory floor plan, and perform coordinate grid processing on the map, with each grid corresponding to a specific coordinate range.

[0080] Extract the location information of each tag from the location code database and convert it to the corresponding map grid coordinates.

[0081] Use geographic information system technology to superimpose the grid coordinates of the tags on the factory floor plan to establish the correspondence between the tag locations and the specific points on the map.

[0082] The superimposition result is calibrated and optimized through image recognition and matching algorithms, and the position coding database is associated with the factory floor plan.

[0083] Obtain a clear and accurate factory floor plan from relevant departments or materials. This map should contain detailed layout of the factory, such as the location of each room, corridor, key facilities, etc. The obtained factory floor plan is gridized in coordinates. The entire map is divided into grids of equal size, and each grid corresponds to a specific coordinate range. This processing method helps to locate specific positions on the map more accurately, providing a basis for subsequent association of tag position information. For example, according to the actual size and accuracy requirements of the factory, the map can be divided into 1 meter x 1 meter grids, each grid has its unique coordinate identifier.

[0084] Extract the position information of each near field communication tag from the previously established position coding database. These position information are stored in the database in the form of code, including the floor, room number and specific path number where the tag is located. Convert the extracted tag position information into corresponding map grid coordinates. According to the specific position information of the tag, combined with the grid division rules of the map, determine the specific coordinates of the tag in the grid. For example, if a tag is located in a certain room on the 3rd floor, according to the layout and grid division of the floor on the map, find the coordinate range of the room in the grid, and then determine the grid coordinates of the tag.

[0085] With the help of geographic information system technology, the grid coordinates of the tag are superimposed with the factory floor plan. Geographic information system technology can analyze, process and display geographic spatial data. By matching the grid coordinates of the tag with the map, the correspondence between the tag position and the specific point on the map is established. In this way, the specific position of each tag can be directly observed on the map. During the superimposition process, the system automatically maps the grid coordinates of the tag to the corresponding position on the map, thereby realizing one-to-one correspondence between the tag position and the map point. Through this correspondence, each tag can be easily found and located on the map.

[0086] Although the grid coordinates of the tag are superimposed with the map through geographic information system technology, there may be some errors, such as inaccurate scale of the map, deviation in the coordinate conversion process, etc. Therefore, image recognition and matching algorithms are needed to calibrate and optimize the superimposition result. Image recognition algorithms can analyze the map and the superimposed image, identify the feature points on the map and the actual position of the tag, and then accurately match these feature points and positions through matching algorithms. According to the matching result, the position of the tag is adjusted and optimized to ensure that the tag position accurately corresponds to the specific point on the map. Through multiple iterations and optimization, the accuracy and reliability of the superimposition result are improved, and finally the accurate association between the position coding database and the factory floor plan is realized.

[0087] The positioning trajectory generation module is used to obtain initial position information and real-time position information during the movement of the worker, and correct the position information by using near field communication tag information to obtain the movement trajectory of the worker.

[0088] The process of obtaining the initial position information of the worker includes:

[0089] When the worker passes through the entrance of the radiation control area, the near field communication induction chip built in the dosimeter is automatically activated, and a communication connection is established with the near field communication tag at the entrance.

[0090] The near field communication tag sends a data packet to the dosimeter, and the data packet includes its own code and position information.

[0091] The dosimeter receives the data packet and decodes and checks it.

[0092] The decoded position information is stored as the initial position information of the worker.

[0093] The activated near field communication induction chip establishes a communication connection with the near field communication tag at the entrance. Near field communication technology uses the principle of near field electromagnetic induction, so that two devices (dosimeter and tag) can transmit data within a short distance. After the connection is established, the near field communication tag at the entrance sends a data packet to the dosimeter. This data packet contains two important information, one is the code of the tag itself, and the other is the detailed information of the location of the tag. The tag code is a code that uniquely identifies the tag, and the position information clearly indicates the specific location of the tag, such as the floor, room number and specific path number, etc.

[0094] After the dosimeter receives the data packet from the near field communication tag, it first decodes it. Since the data packet is transmitted in a specific encoding format, the dosimeter needs to restore it to readable information for subsequent processing. After decoding, the dosimeter will check the decoded information. The purpose of checking is to ensure the accuracy and integrity of the received information, and to prevent errors or loss of data during transmission. The checking method can be to calculate the checksum of the data, to verify using encryption algorithm, etc.

[0095] After decoding and checking, the dosimeter stores the decoded position information as the initial position information of the worker. The stored position information can be used by the subsequent positioning and tracking system to determine the starting position of the worker after entering the radiation control area. The dosimeter usually stores this information in the internal memory and effectively manages the data. The data can be organized according to certain formats and rules for subsequent query, analysis and processing. For example, the position information can be associated with the identity information of the worker, the entry time, etc. to form a complete record.

[0096] The process of obtaining real-time position information of the worker during the journey includes:

[0097] The dosimeter continuously scans the surrounding near field communication signals during the worker's journey, and triggers the data collection program when a new near field communication tag signal is detected.

[0098] The internal clock of the dosimeter records the time when the tag is detected.

[0099] The encoding information of the newly detected near field communication tag is read, and the corresponding point information is obtained by querying the position encoding database.

[0100] The time and point data are encrypted and uploaded, and the real-time position information of the worker is updated.

[0101] During the worker's journey, the near field communication sensing chip built-in the dosimeter will continuously scan the surrounding near field communication signals. The NFC sensing chip has a certain signal detection range. As long as there is a near field communication tag within this range, the chip can detect its signal. When the dosimeter detects a new near field communication tag signal, it means that the worker may have moved to a new position, at which time the internal data collection program of the dosimeter will be triggered.

[0102] The dosimeter is equipped with a clock device, which accurately records the time point when a new near field communication tag signal is detected. The recorded time information is very important for subsequent analysis of the worker's movement trajectory and activity time, which can help determine the length of time the worker stays at each location and the speed of movement, etc.

[0103] The dosimeter will read the encoding information of the newly detected near field communication tag. This encoding is the unique identifier of the tag, which corresponds to the information in the previously established position encoding database. By querying the position encoding database, the dosimeter can obtain the corresponding point information according to the read tag encoding, that is, the specific location of the tag, including the floor number, room number and detailed path number, etc.

[0104] To ensure the security and privacy of the data, the dosimeter will encrypt the recorded time and the queried point data. The encryption algorithm can use symmetric encryption or asymmetric encryption, etc. to ensure that the data is not stolen or tampered with during transmission. After encryption, the dosimeter will upload these data to the relevant management system or server. The uploading method can be through a wireless communication network such as Wi-Fi, Bluetooth or other dedicated wireless communication protocols. After receiving the uploaded data, the management system or server will update it to the real-time location information of the workers. In this way, the supervisors can real-time understand the specific location and action trajectory of the workers in the radiation control area.

[0105] The process of correcting the location information using near field communication tag information includes:

[0106] Obtain the worker's location information using a long-distance communication network.

[0107] Fuse the location information and real-time location information using the Kalman filter algorithm to obtain fused location information.

[0108] Compare the fused location information with the near field communication tag location distribution to determine if there is a location deviation. If there is a deviation, use the regression analysis method in machine learning to dynamically correct the location information combined with historical location data and environmental factors.

[0109] Connect the corrected location information in chronological order to obtain the personnel motion trajectory.

[0110] Obtain the worker's location information by means of long-distance communication networks such as 4G, 5G, etc. These networks have a wide coverage range and can enable the dosimeter to perform stable data transmission with the external server. The dosimeter collects relevant data about its location through the built-in positioning module and sends it to the server through the long-distance communication network, so that the server obtains the approximate location information of the workers.

[0111] The Kalman filter algorithm is an optimal recursive filter for estimating the state of a system, which can combine the dynamic model of the system and the measurement data to optimally estimate the state of the system. The worker's location information obtained through the long-distance communication network and the real-time location information obtained in the previous step (based on near field communication tags) are used as inputs to fuse them using the Kalman filter algorithm. The algorithm will weight the two types of location information based on their error characteristics and reliability to obtain fused location information.

[0112] The fusion position information is compared with the position distribution of the near-field communication tags. The positions of the near-field communication tags are known and relatively accurate. By comparison, it can be judged whether the fusion position information has deviation. For example, if the fusion position information shows that the worker is in a certain area, but there is no corresponding near-field communication tag signal detected near the area, there may be a position deviation. If there is a deviation, a regression analysis method in machine learning is used for correction. Regression analysis can establish a mathematical model according to historical position data and environmental factors (such as signal interference, building shielding, etc.), and dynamically adjust the position information through the model. For example, the law of position deviation under different environmental conditions is analyzed, and then the current position deviation is predicted and corrected according to the current environmental factors and historical data.

[0113] The corrected position information is sequentially connected in time sequence to obtain the motion trajectory of the worker. This trajectory can more accurately reflect the action path of the worker in the radiation control area, which is helpful for the supervisor to monitor and manage the activities of the worker, such as judging whether the worker acts according to the specified route or enters the dangerous area.

[0114] The dose monitoring module is used for real-time radiation dose monitoring of the worker, and collects real-time radiation dose data received by the worker.

[0115] The process of collecting real-time radiation dose data received by the worker includes:

[0116] The dosimeter is provided with a radiation sensor, which is used to sense the radiation dose in the surrounding environment in real time.

[0117] The radiation sensor converts the sensed radiation signal into an electrical signal, and converts the electrical signal into a digital signal through an analog-to-digital converter.

[0118] The microprocessor inside the dosimeter uses an integral algorithm to process and analyze the digital signal, and calculates the cumulative radiation dose received by the worker in a preset time period.

[0119] The calculated radiation dose data is encrypted and stored using blockchain technology to obtain real-time radiation dose data.

[0120] The information display module is used to align the time sequence of the worker motion trajectory and the real-time radiation dose data, and visually display on the basic layout.

[0121] The process of aligning the time sequence of the worker motion trajectory and the real-time radiation dose data includes:

[0122] The worker motion trajectory data and the real-time radiation dose data are obtained respectively, and the worker motion trajectory data and the real-time radiation dose data contain corresponding time stamps.

[0123] The time synchronization algorithm is used to calibrate the timestamps of the two types of data.

[0124] According to the calibrated timestamps, the personnel motion trajectory data and the real-time radiation dose data are sorted in chronological order.

[0125] Using an interpolation algorithm, the missing data points in the time series are supplemented, so that the personnel motion trajectory and the real-time radiation dose data are aligned in the time series.

[0126] The process of visualizing on the base layout includes:

[0127] Using WebGL technology, a three-dimensional model of the associated plant floor map is generated to create a virtual plant environment.

[0128] The aligned personnel motion trajectory data and real-time radiation dose data are loaded into the virtual plant environment, and different colors and transparencies are used to render the personnel motion trajectories with different radiation dose values.

[0129] The dose warning module is used to analyze the visualization results in real time, and according to the preset safety radiation dose threshold, it is judged whether the radiation dose of the working personnel in the environment exceeds the safety range, and if so, a radiation warning is given.

[0130] According to relevant radiation protection regulations, industry standards and safety requirements of specific working environment, the dose threshold of different types of radiation is determined. For example, for gamma rays in radioactive workplaces, there may be a daily and weekly cumulative dose limit. In addition to general standards, individual conditions such as age, health status, and work experience can also be taken into account to set personalized dose thresholds for each worker. For example, for novice workers, the threshold can be lowered to improve safety.

[0131] The calculated cumulative radiation dose is compared in real time with the pre-set dose threshold. It is judged whether it exceeds or approaches the threshold, and once it exceeds the set threshold of different levels, the corresponding warning mechanism will be triggered.

[0132] According to the degree to which the radiation dose exceeds the threshold, different warning levels are divided, such as level one warning (slightly over standard), level two warning (moderately over standard), level three warning (severely over standard), etc. Each warning level corresponds to different warning methods and handling measures.

[0133] The dosimeter is equipped with an audible and visual alarm, which emits different frequency and intensity of sound signals and flashing light signals when the warning is triggered, reminding the workers to pay attention to the radiation dose. For example, a slight beep and slow flashing light may be emitted at level one warning, and the frequency and intensity of sound and light are increased at level two warning.

[0134] In addition to the acousto-optic alarm, the dosimeter can also remind the workers through vibration. Different levels of warning can set different vibration modes, so that workers can also timely perceive the warning information in noisy environments.

[0135] The warning information is also sent to the monitoring center and the terminal devices (such as mobile phones, computers, etc.) of the management personnel through the wireless communication network. The monitoring center can real-time understand the radiation dose of the workers and take corresponding measures, such as notifying the workers to evacuate, adjusting the work arrangement, etc.

[0136] In summary, the embodiment provides a wireless personal electronic dosimeter based on near field communication assisted positioning. By combining near field communication technology with personnel positioning requirements, a unique technical solution is formed. The personnel position is preliminarily determined through a wireless network, and the positioning accuracy is verified through a contact type near field communication tag, avoiding positioning deviation caused by simply relying on signal strength. The characteristics of short distance communication of near field communication are used to avoid the interference of complex environments on long distance wireless signals from a physical level; the wireless positioning data is cross-verified with the position code preset by the near field communication tag, improving the positioning accuracy. The near field communication tag can be directly pasted on the surface of the existing equipment, and the deployment is simple without the need for shutdown and modification; the deployment cost is low, and the tag can be reused; the positioning is reliable, suitable for the special scene requirements of the nuclear industry, and has practical application potential. The dual mechanism of preliminary positioning through a wireless network and assisted positioning through near field communication is adopted, without the need for large-scale construction of communication base stations, significantly reducing the deployment difficulty and cost; in areas with serious signal attenuation, room-level positioning is realized by using the short distance communication characteristics of near field communication, effectively avoiding positioning errors across rooms or floors, and being suitable for complex environments such as nuclear power plants. The absolute position calibration of the near field communication physical tag solves the floor misjudgment problem of traditional wireless positioning and improves the positioning accuracy; the tag and the map are fused and displayed to realize visual display of the personnel position; by obtaining position-dose dual information, fine control of radiation exposure is realized.

[0137] Based on the same overall inventive concept, the present application also protects a wireless personal electronic dosimeter positioning method. Hereinafter, a wireless personal electronic dosimeter positioning method provided by the present application will be described, and the wireless personal electronic dosimeter positioning method described hereinafter can be mutually corresponding and referred to the wireless personal electronic dosimeter based on near field communication assisted positioning described above.

[0138] Figure 3 is a flowchart of a wireless personal electronic dosimeter positioning method provided by an embodiment of the present application.

[0139] As shown in Figure 3 , the wireless personal electronic dosimeter positioning method comprises:

[0140] When the worker passes through the entrance of the radiation control area, the dosimeter interacts with the near field communication tag at the entrance, and obtains the initial position information.

[0141] During the movement, when a new near field communication tag is detected, the time and point data are uploaded to the management system, and the position information is updated.

[0142] The management system corrects the position information calculated by using the long-distance communication network by using the near field communication tag information, and obtains the movement trajectory of the worker.

[0143] The dose management system aligns the time sequence of the positioning data and the dose data, and visually displays the movement trajectory of the worker and the dose information on the plant floor plan.

[0144] Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software and the necessary general hardware platform, and of course, can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the method described in each embodiment or some parts of the embodiment.

[0145] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A wireless personal electronic dosimeter based on near-field communication-assisted positioning, characterized in that, include: The tag deployment module is used to establish a radiation control zone location coding database and associate it with the factory floor plan to obtain a basic layout for visually displaying the location of personnel. The positioning trajectory generation module is used to obtain the initial position information and real-time position information of the workers during their movement, and to correct the position information using near-field communication tag information to obtain the personnel's movement trajectory. The process of correcting location information using near-field communication tag information includes: Long-distance communication networks are used to obtain the location information of workers. The location information and the real-time location information are fused using a Kalman filter algorithm to obtain fused location information; By comparing the fused location information with the location distribution of near-field communication tags, it is determined whether there is a location deviation. If there is a deviation, the location information is dynamically corrected by using regression analysis in machine learning, combined with historical location data and environmental factors. The corrected location information is connected in chronological order to obtain the personnel movement trajectory; The dose monitoring module is used to monitor the radiation dose of workers in real time and collect real-time radiation dose data received by workers. The information display module is used to align the personnel movement trajectory with the time series of the real-time radiation dose data and to visualize the data on the basic layout. The dose warning module is used to analyze the visualization results in real time. Based on the preset safe radiation dose threshold, it determines whether the radiation dose in the environment where the operator is located exceeds the safe range, and if so, it issues a radiation warning.

2. The wireless personal electronic dosimeter based on near-field communication-assisted positioning according to claim 1, characterized in that, The process of establishing a location coding database for radiation control areas includes: Each near-field communication technology tag affixed to critical path nodes, room entrances, and key work areas in the radiation control zone is assigned a unique code. The unique code indicates the specific location information of the tag, which includes the floor, room number, and specific path number. The tag codes are associated with and stored with the corresponding location information to form a preliminary set of location information; The preliminary location information set is cleaned to obtain the processed location information set; The processed location information set is stored using distributed hash table technology to obtain a complete location coding database.

3. The wireless personal electronic dosimeter based on near-field communication-assisted positioning according to claim 1, characterized in that, The process of associating factory floor plans includes: Obtain a floor plan of the factory and process the map into a coordinate grid, with each grid corresponding to a specific coordinate range; Extract the location information of each tag from the location coding database and convert it into the corresponding map grid coordinates; Using geographic information system technology, the grid coordinates of the labels are overlaid with the factory floor plan to establish the correspondence between the label locations and specific points on the map; Image recognition and matching algorithms are used to calibrate and optimize the overlay results, and the location coding database is associated with the factory floor plan.

4. The wireless personal electronic dosimeter based on near-field communication-assisted positioning according to claim 1, characterized in that, The process of obtaining the initial location information of the workers includes: When workers pass through the entrance to the radiation control area, the near-field communication sensor chip built into the dosimeter is automatically activated and establishes a communication connection with the near-field communication tag at the access control point. The near-field communication tag sends a data packet to the dosimeter, the data packet including its own encoding and location information; The dosimeter receives the data packet and decodes and verifies it; The decoded location information is stored as the initial location information of the workers.

5. The wireless personal electronic dosimeter based on near-field communication-assisted positioning according to claim 1, characterized in that, The process of obtaining real-time location information of workers during their movement includes: The dosimeter continuously scans the surrounding near-field communication signals as the operator moves. When a new near-field communication tag signal is detected, the data acquisition program is triggered. The dosimeter's internal clock records the time the tag was detected; Read the encoding information from the newly detected near-field communication tags and obtain the corresponding location information by querying the location encoding database; The time and location data are encrypted, and the encrypted data is uploaded to update the real-time location information of the workers.

6. The wireless personal electronic dosimeter based on near-field communication-assisted positioning according to claim 1, characterized in that, The process of collecting real-time radiation dose data received by workers includes: The dosimeter has a built-in radiation sensor that is used to sense the radiation dose in the surrounding environment in real time. The radiation sensor converts the sensed radiation signal into an electrical signal, and then converts the electrical signal into a digital signal through an analog-to-digital converter. The microprocessor inside the dosimeter uses an integral algorithm to process and analyze the digital signal, and calculates the cumulative radiation dose received by the operator within a preset time period. By using blockchain technology to encrypt and store the calculated radiation dose data, real-time radiation dose data can be obtained.

7. The wireless personal electronic dosimeter based on near-field communication-assisted positioning according to claim 1, characterized in that, The process of aligning the personnel movement trajectory with the time series of the real-time radiation dose data includes: Personnel movement trajectory data and real-time radiation dose data are acquired separately, and the personnel movement trajectory data and the real-time radiation dose data contain corresponding timestamps; A time synchronization algorithm is used to calibrate the timestamps of the two types of data; Based on the calibrated timestamps, the personnel movement trajectory data and real-time radiation dose data are sorted in chronological order; Interpolation algorithms are used to fill in missing data points in the time series, aligning personnel movement trajectories and real-time radiation dose data in the time series.

8. The wireless personal electronic dosimeter based on near-field communication-assisted positioning according to claim 1, characterized in that, The process of visualizing the basic layout includes: WebGL technology is used to create a 3D model of the associated factory floor plan to generate a virtual factory environment. The aligned personnel movement trajectory data and real-time radiation dose data are loaded into the virtual factory environment, and different colors and transparency are used to render the personnel movement trajectories with different radiation dose values.

9. A method for locating a wireless personal electronic dosimeter, wherein the method employs a wireless personal electronic dosimeter based on near-field communication-assisted positioning as described in any one of claims 1-8, characterized in that, The methods include: Near-field communication tags were deployed at critical path nodes, room entrances, and key work areas in the radiation control zone. A location coding database was established, and the coordinates of the near-field communication tags were associated with the plant floor plan. When personnel pass through the entrance to the radiation control area, the dosimeter interacts with the near-field communication tag at the access control point to obtain initial location information; During the journey, when a new near-field communication tag is detected, the time and location data are uploaded to the management system to update the location information; The management system uses near-field communication tag information to correct the location information calculated using long-distance communication networks, thereby obtaining the personnel movement trajectory; The dosage management system aligns the time series of location data with dosage data, and visualizes personnel movement trajectories and dosage information on the plant floor plan.

Images