JP2013003078A - Radiation monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation monitoring system easy to install and capable of autonomous operation upon an emergency situation.SOLUTION: A radiation monitoring system 100 comprises: plural measurement units 21-24 that measure radiation dose; and a network management unit that manages a communication network with the measurement units 21-24. The measurement units 21-24 transmit measurement data measured according to measurement preset information to the network management unit 10. The network management unit 10 receives the measurement data transmitted from the measurement units 21-24, stores the received measurement data to a measurement data DB18 and provides the measurement data stored in the measurement data DB18 to an information processing device capable of displaying and analyzing the measurement data by means of wireless communication. At least a part of the measurement units 21-24 and the network management unit 10 can be driven by a battery.

Description

  The present invention relates to a radiation monitoring system including a plurality of measurement units that measure radiation dose and a network management unit that manages a communication network with the measurement units.

  2. Description of the Related Art Conventionally, there is known a radiation monitoring system that monitors the amount of radiation, grasps the diffusion state of a radioactive substance, and predicts the diffusion state of the radioactive substance.

  Such a radiation monitoring system is a system for monitoring the radiation dose in places where radioactive materials may leak due to disasters or accidents and contaminate surrounding facilities, such as facilities handling radioactive materials, Multiple monitoring posts with radiation sensors, rain gauges, wind direction and anemometers are placed at a distance from each other, and based on the observation data sent from the monitoring posts in the monitoring unit connected to the multiple monitoring posts There is a system that obtains the intensity distribution of the radiation dose, grasps the current state, and predicts the future diffusion state of the radioactive substance (for example, Patent Document 1).

  Also, for example, in the surrounding area of various nuclear facilities such as nuclear power plants, there are many mobile slave stations that measure radiation dose, and slaves that are far away from the slave stations and transmitted wirelessly from the slave stations. An environmental radiation monitoring apparatus or the like that includes a master station that receives station position data and radiation dose data and performs data processing is disclosed (for example, Patent Document 2).

JP 2002-228754 A JP-A-8-334563

  However, in the conventional radiation monitoring system, when installing a measurement unit (for example, a monitoring post or a slave station) that measures the radiation dose, it may be necessary to perform wiring work or special setting processing. There has been a problem that the work burden required for installation may become excessive.

  In addition, the conventional radiation monitoring system has a problem in that radiation monitoring may be stopped in an emergency such as when power supply from outside is interrupted due to a disaster or accident.

  In order to solve the above-described problems, an object of the present invention is to provide a radiation monitoring system in which a measurement unit can be easily installed and can be independently driven in an emergency.

  The radiation monitoring system of the present invention is a radiation monitoring system comprising a plurality of measurement units for measuring a radiation dose and a network management unit for managing a communication network with the measurement unit, wherein the measurement unit includes a radiation dose Measuring means for measuring the radiation dose according to measurement setting information indicating the measurement frequency and the transmission frequency of the measurement data, and measurement data transmission means for transmitting the measurement data measured by the measurement means to the network management unit, The network management unit includes measurement data storage means for storing measurement data measured by the measurement means of the measurement unit, measurement data reception means for receiving measurement data transmitted by the measurement data transmission means of the measurement unit, Measurement received by the measurement data receiving means Measurement data stored in the measurement data storage means and information processing apparatus capable of displaying and analyzing the measurement data are provided by wireless communication to the measurement data storage means. And at least a part of the measurement unit and the network management unit can be driven by a battery.

  With the above configuration, it is possible to provide a radiation monitoring system in which a measurement unit can be easily installed and can be independently driven in an emergency.

  The network management unit includes measurement setting information management means for managing the measurement setting information associated with each of the plurality of measurement units, and the measurement setting information managed by the measurement setting information management means. The measurement unit is received by the measurement setting information receiving means and the measurement setting information receiving means for receiving the measurement setting information transmitted by the measurement setting information transmitting means. Measurement setting information storage means for storing measurement setting information in a storage area of a predetermined storage device, and the measurement means measures the radiation dose according to the measurement setting information stored by the measurement setting information storage means; May be.

  The network management unit includes: a radiation dose determining unit that determines whether the radiation dose indicated by the measurement data received by the measurement data receiving unit is greater than or equal to a predetermined threshold; and the radiation dose determined by the radiation dose determiner is greater than or equal to the predetermined threshold. Measurement setting information update means for updating the measurement setting information managed by the measurement setting information management means so as to increase the measurement frequency of the radiation dose when it is determined that, the measurement setting information transmission means The measurement setting information updated means may be configured to transmit the updated measurement setting information to the measurement unit corresponding to the updated measurement setting information in response to the measurement setting information being updated by the measurement setting information updating means.

  The network management unit selects a measurement unit that updates the associated measurement setting information in accordance with a predetermined rule when the radiation dose is determined to be equal to or greater than the predetermined threshold by the radiation dose determination unit. The measurement setting information updating unit may be configured to update the measurement setting information associated with the measurement unit selected by the update target selection unit.

  The wireless communication means of the network management unit may be configured to communicate with the information processing apparatus via a wireless LAN.

  The wireless communication means of the network management unit may be configured to communicate with the information processing apparatus by ad hoc wireless communication.

  The information processing apparatus includes a data management server for managing various data, the data management server including measurement data analysis means for analyzing measurement data stored in measurement data storage means of the network management unit, and the measurement An analysis result information registration unit that registers analysis result information indicating an analysis result by the data analysis unit in a predetermined storage area may be provided.

  The wireless communication means of the network management unit may be configured to communicate with the data management server by Internet communication via a wide area wireless communication line.

  The information processing apparatus includes a battery-driven information terminal, and the information terminal includes display means for displaying measurement data provided by the wireless communication means of the network management unit on a display screen of a display device. It may be.

  The measurement unit includes a network construction unit that automatically constructs an ad hoc wireless network, and the network management unit is an ad hoc wireless network constructed by the network construction unit of the measurement unit. Address storage means storing an address management table in which address groups of logical addresses, network addresses, and MAC addresses respectively assigned are registered, and at least a network address among addresses assigned to the self from the distributed node Address confirmation means for confirming whether the presented address is normal or not by referring to the address management table when the data presenting the address including the address is received by the address confirmation means. Address transmission request means for making an address transmission request to all the distributed nodes in response to the determination that the received address is not normal, and the address of each distributed node transmitted in response to the address transmission request It may be configured to include table updating means for registering in the address management table and updating the address management table.

  The address confirmation means confirms whether or not the presented network address is registered in the address management table as the network address of the distributed node of the data transmission source, and the address presented when it is not registered is not normal May be determined.

  The network management unit includes non-delivery confirmation means for confirming that the data transmitted to the distributed node has not arrived, and the address transmission request means confirms the non-delivery of data by the non-delivery confirmation means Even in such a case, an address transmission request may be made to all the distributed nodes.

  The network management unit receives the address group assigned to itself from a distributed node newly participating in the ad hoc wireless network, and uses the received address group as an address group of a source distributed node. An address group additional registration means for additionally registering in the management table may be included.

  In response to receiving the address group assigned to itself from the distributed node that participated by exchanging with the distributed node that was operating in the ad hoc wireless network, the network management unit in the received address group The address group including the same logical address as the logical address may be overwritten with the received address group, and address group update registration means for updating the address group registered in the address management table may be included.

  The address transmission request unit may be configured to make an address transmission request to all the distributed nodes even when a predetermined period has elapsed after making a previous address transmission request.

  According to the present invention, it is possible to provide a radiation monitoring system in which a measurement unit can be easily installed and can be driven independently in an emergency.

It is a block diagram which shows the example of a structure of a radiation monitoring system. It is a block diagram which shows the example of a structure of a network management unit. It is explanatory drawing which shows the example of a measurement data management table. It is a flowchart which shows the example of a radiation dose measurement process. It is a flowchart which shows the example of a measurement data display process. It is a block diagram which shows the example of a structure of the network management unit in 2nd Embodiment. It is explanatory drawing which shows the example of an address management table. It is a flowchart which shows the example of a network management process.

<First Embodiment>
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an example of the configuration of a radiation monitoring system 100 showing an embodiment of the present invention. As shown in FIG. 1, the radiation monitoring system 100 includes a network management unit 10, a plurality of measurement units 21 to 24, a relay unit 40, a data management server 60, and a wireless LAN communication information terminal 70. Any number of measurement units may be provided. A plurality of network management units 10, relay units 40, data management servers 60, and wireless LAN communication information terminals 70 may be provided.

  In this example, the network management unit 10 and the wireless LAN communication information terminal 70 construct a wireless LAN. Further, the network management unit 10 and the data management server 60 are each connected to a communication network 80 such as the Internet.

  Each of the measurement units 21 to 24 includes various sensors including a radiation sensor (or a radiation measuring instrument) (not shown), wireless communication terminals 31 to 34, and a battery (not shown). Yes. Each of the wireless communication terminals 31 to 34 is a network distributed cell computer (NICE) in an ad hoc wireless network, and has various signal input / output functions and ZigBee wireless network linkage functions. The wireless communication terminals (or ad hoc wireless communication terminals) 31 to 34 are high performance, small size, low cost, and low power consumption measurement control computers, respectively, and function as distributed nodes in the ad hoc wireless network. In this example, the wireless communication terminals 31 to 34 are configured to be driven (operated) by a battery, such as an amplifier (AMP), a DC / DC converter (DC / DC), and a PMRLY (PhotoMOS relay). Is provided. That is, each of the wireless communication terminals 31 to 34 includes various devices for performing power control of various sensors, transmission / reception of measurement signals, and the like, using electric power supplied from a battery included therein. In addition, since a general thing is used about an amplifier etc., detailed description here is abbreviate | omitted.

  The radiation sensor is of a low power type that can be driven by a small battery such as a dry cell, and for example, a small ionization chamber type radiation survey meter is suitable. In this example, it is assumed that the measurement units 21 to 24 each measure a radiation dose using a radiation sensor for each preset time.

  Each of the wireless communication terminals 31 to 34 is preferably capable of long-distance communication and low power consumption. In this example, the case where ZigBee (registered trademark) communication is employed for communication performed by the wireless communication terminals 31 to 34 will be described as an example.

  Each of the wireless communication terminals 31 to 34 functions as an independent measurement / control node by connecting a sensor or the like. However, by attaching to an existing facility or the like, the facility or the like can be brought online. . Each of the wireless communication terminals 31 to 34 of this example is designed to operate only with a few kilobytes of RAM built in the microcomputer, which is the main component, for the purpose of reducing component costs and power consumption. Depending on the application, a wired communication port such as RS232C, CAN, 1-Wire (registered trademark) may be provided, and if there is no problem of component cost and power consumption, an external storage device such as a microSD memory may be installed. It is good also as a specification to provide.

  As long as the battery has an amount of power that can drive the measurement units 21 to 24, a battery that is as small as possible and has a large amount of stored electricity is suitable. Specifically, an alkaline dry battery, an oxyride battery, a rechargeable lithium ion storage battery, a nickel hydride storage battery, a nickel cadmium storage battery, or the like can be used as the battery.

  In addition, a communication relay function may be added to at least one of the measurement units 21 to 24 to function as a “measurement / relay unit”.

  Moreover, in this example, it demonstrates by taking the case where the measurement units 21-24 are provided with a wind direction, an anemometer, and a rain gauge as an example. With such a configuration, the measurement units 21 to 24 can measure the wind direction, the wind speed, and the amount of rainfall together with (for example, simultaneously) the measurement of the radiation dose.

  The wind direction / velocity type and rain gauge are preferably of a low power type. These sensors can be used to predict the diffusion range of radioactive substances by measuring the radiation direction and simultaneously measuring the wind direction, wind speed, and rainfall at the measurement location.

  Moreover, it is good also as a structure which adds a natural energy power generation device to the measurement units 21-24. In this case, it is preferable that the battery with which the measurement units 21-24 are provided is a storage battery. In addition, the natural energy power generation apparatus can use a solar power generation apparatus, a wind power generation apparatus, a vibration power generation apparatus, etc. as appropriate, but has a power generation capability that can drive the measurement unit without receiving an electric supply from an external power source. It is preferable to have. Therefore, a solar power generation device is preferable because it is relatively inexpensive and has high power generation capability.

  The network management unit 10 is configured by an information processing apparatus such as a WWW server, and is managed by an administrator of the radiation monitoring system 100, for example.

  In this example, a wireless communication system 50 based on an ad hoc wireless network (in this example, a ZigBee wireless network) is constructed by the network management unit 10, the plurality of measurement units 21 to 24, and the relay unit 40. The format of the communication network in the wireless communication system 50 is not particularly limited, and may be a general format such as a mesh format, a star format, or a tree format.

  FIG. 2 is a block diagram showing an example of the configuration of the network management unit 10 in this example. As shown in FIG. 2, the network management unit 10 includes a measurement unit network management server 10 </ b> A and a battery B.

  The measurement unit network management server 10A (hereinafter referred to as management server 10A) is an information processing apparatus that functions as a management node in an ad hoc wireless network. As shown in FIG. 2, the management server 10 </ b> A includes a data transmission / reception unit 11 that executes various communication processes, a data registration unit 12 that executes a process for registering data acquired in the communication process in a predetermined storage area, and the like. , A measurement data transmission instruction unit 13 that executes measurement data transmission instruction (or transmission request) processing, etc., to the measurement units 21 to 24, a measurement setting information management unit 14, a radiation dose determination unit 15, and a measurement setting An information update unit 16, an update target selection unit 17, a measurement data DB 18, and a schedule DB 19 are included.

  Here, the measurement data transmission instructing unit 13 measures the measurement frequency (for example, measurement once every 10 minutes, measurement once every 60 seconds, etc.) and measurement for all or specific measurement units. A process for giving an instruction regarding the data transmission frequency is executed. Specifically, the measurement data transmission instruction unit 13 is a measurement setting that indicates the measurement frequency of the radiation dose or the transmission frequency of the measurement data, for example, according to an operation by the user of the network management unit 10 (or the administrator of the radiation monitoring system 100). Information is created, and processing for transmitting the created measurement setting information to each of the measurement units 21 to 24 is executed. In addition, the measurement data transmission instruction | indication part 13 preserve | saves the produced measurement setting information in schedule DB19 in the state matched with the identification information of each measurement unit.

  Here, the schedule DB 19 is a storage medium that stores schedule information indicating a schedule related to measurement of various data using the plurality of measurement units 21 to 24 such as measurement setting information corresponding to each of the plurality of measurement units 21 to 24. . The schedule DB 19 may store measurement setting information created in advance.

  Further, the measurement setting information management unit 14 executes processing for managing measurement setting information associated with each of the plurality of measurement units 21 to 24. In this example, the measurement setting information management unit 14 inputs / outputs the measurement setting information corresponding to each of the plurality of measurement units 21 to 24 and the input / output request corresponding to the data among the schedule information stored in the schedule DB 19. Various processes for centrally managing measurement setting information indicating a measurement method using the plurality of measurement units 21 to 24 such as processes in the schedule DB 19 are executed.

  Moreover, the radiation dose determination part 15 performs the process which determines whether the radiation dose which the measurement data received from each of the some measurement units 21-24 is more than a predetermined | prescribed threshold value.

  In addition, the measurement setting information update unit 16 increases the measurement frequency of the radiation dose when the radiation dose determination unit 15 determines that the radiation dose is equal to or greater than a predetermined threshold (for example, the measurement interval is set to the current measurement interval). The measurement setting information (that is, measurement setting information stored in the schedule DB 19) managed by the measurement setting information management unit 14 is updated (including addition and deletion of information). Execute the process. In addition, as a method for updating the measurement setting information, for example, the measurement setting information update unit 16 selects 1 from a plurality of update contents set in advance based on the radiation dose indicated by the measurement data, the distance to other measurement units, and the like. It is good also as a structure which selects one update content and updates measurement setting information based on the selected update content. Further, the measurement setting information update unit 16 is based on, for example, measurement data (radiation dose, wind direction, air flow, etc.) stored in the measurement data DB 18, a residual power amount (or predicted remaining power amount) of each measurement unit, and the like. It is good also as a structure which determines the update content. It is assumed that the rules and various data used for updating the measurement setting information are stored in a storage device (for example, update reference information DB) provided in the network management unit 10 (or management server 10A).

  In addition, the update target selection unit 17 performs measurement to update measurement setting information associated in the schedule DB 19 according to a predetermined rule when the radiation dose determination unit 15 determines that the radiation dose is equal to or greater than a predetermined threshold. Executes the process of selecting a unit. That is, the measurement unit selected by the update target selection unit 17 changes the measurement frequency and the like when the measurement setting information is updated. Note that the rules used for selecting the update target include, for example, the number of hops between a plurality of measurement units 21 to 24 (the number of hops in ad hoc wireless communication) and the geography in which the plurality of measurement units 21 to 24 are arranged. A plurality of measurement units 21 to 24 such as wind direction, wind speed, rainfall amount, etc. within the measurement range (that is, the area where the plurality of measurement units 21 to 24 are arranged) when selecting the target position and update target are actually arranged It is preferable that the rule is such that the measurement setting information can be updated according to the set environment. Further, although not shown in the figure, it is assumed that information regarding a rule for selecting an update target is stored in a storage device (for example, rule DB) included in the net management unit 10 (or the management server 10A).

  Moreover, measurement data DB18 memorize | stores measurement data, such as a radiation dose received from the measurement units 21-24.

  FIG. 3 is an explanatory diagram illustrating an example of a measurement data management table in the measurement data DB 18. As shown in FIG. 3, in the measurement data management table, for each of the measurement units 21 to 24, the assigned measurement unit number, measurement time, measurement position, measured radiation dose, wind direction, wind speed, and rainfall are shown. Contains measurement data.

  In addition, about the measurement position, at the time of installation of each of the measurement units 21 to 24, for example, the installer of the measurement units 21 to 24 separately acquires GPS information of the installation location and sets it in the memory of the measurement unit. It is assumed that position information is registered as data.

  For example, each of the measurement units 21 to 24 specifies its own current position (for example, specifies coordinates indicating its current position using GPS), and includes the current position specified in the measurement data as a network management unit. 10 may be transmitted. However, when the GPS is connected to the measurement unit and the GPS information is automatically acquired, the power consumption of the GPS itself is large. Therefore, if the measurement point does not move frequently, setting of the current position by the installer or the like is required. The configuration is more practical.

  In addition, it is good also as a structure which acquires GPS information only when the measurement units 21-24 detect the acceleration more than a specific magnitude | size with a triaxial acceleration sensor, and transmits the acquired GPS information to the network management unit 10. FIG. That is, the acceleration sensor may be used as detection of movement of the measurement unit, and GPS information may be acquired and transmitted to the network management unit 10 when there is a possibility of movement. With such a configuration, it is possible to accurately grasp the current position of the measurement unit using the measurement data management table while suppressing power consumption of the measurement unit. In addition, when setting it as such a structure, the measurement units 21-24 determine whether the movement of the measurement units 21-24 was completed based on the data acquired by the acceleration sensor, and determined that the movement was completed. It is preferable that the GPS information is acquired at a time (for example, when the acceleration reaches a reference value) or after a predetermined time has elapsed after determining that the movement has been completed. This is to reduce power consumption by suppressing the number of times GPS information is acquired.

  The management server 10A manages the operation of all the wireless communication terminals 31 to 34 linked to the ZigBee wireless network, and also transmits data such as sensor information (measurement data in this example) from each of the plurality of wireless communication terminals 31 to 34. .) Is collected and transmitted to the data management server 60 and the wireless LAN communication information terminal 70. Specifically, the data transmission / reception unit 11 of the management server 10A includes an ad hoc wireless communication function, a wireless LAN communication function, and a wide area wireless communication function.

  Here, the “ad hoc wireless communication function” is used for communication with each of the measurement units 21 to 24. According to ad-hoc communication, bidirectional communication is automatically started between communication terminals existing within a communicable range (for example, within a communicable distance of several tens to several hundred meters). Conveniently, various types of wireless communication networks such as mesh type and star type can be easily formed without performing wiring between each measurement unit and special setting processing even when installing a wide range of . In this example, ZigBee communication is adopted in order to realize an ad hoc wireless communication function.

  The “wireless LAN communication function” is used for communication with the wireless LAN communication information terminal 70. According to wireless LAN communication, it is generally possible to transmit and receive a large amount of data in a shorter time than ad hoc wireless communication. In addition, if the communication format adopted by mobile terminals such as mobile phones (especially smartphones) and personal computers (personal computers) such as Wi-Fi (registered trademark) is used, When the monitoring system 100 is realized, it is not necessary to prepare a dedicated information terminal, which is convenient. In addition, regarding a common format, it is good also as a structure which employ | adopts the communication format widely employ | adopted as the communication device which can be used by connecting externally to a smart phone or a personal computer. In this example, since Wi-Fi communication is employed, the communicable distance between the communication terminals is generally several tens of meters.

  The “wide area wireless communication function” is used for communication with the data management server 60. According to wide area wireless communication using an Internet line or a satellite communication line, a large amount of data can be transmitted and received over a long distance in a short time. In this example, an Internet communication line via a mobile phone line is used.

  In addition, when using an external communication infrastructure such as a mobile phone line or an Internet line, when a large-scale disaster or accident occurs, the communication infrastructure breaks down and is disconnected, or a large number of users There is a problem that communication may be delayed due to concentration of access. Therefore, when introducing a radiation monitoring system, it is preferable to pay attention to the installation position and number of communication infrastructures.

  In addition, since the management server 10A has few restrictions on cost and power consumption, a microcomputer that is much higher performance than the microcomputer mounted on each of the plurality of wireless communication terminals 31 to 34 is mounted, and several tens of megabytes are installed. RAM and a multi-gigabyte storage device (eg SD memory) are installed. These storage media are used as the measurement data DB 18 and an address DB 15B described later.

  Further, the management server 10A is equipped with a real-time clock (RTC) that serves as a reference for the entire ad hoc wireless network.

  It is preferable that the battery B included in the network management unit 10 has a larger storage amount than that added to each of the plurality of measurement units 21 to 24. This is because the network management unit 10 generally has a larger amount of data communication and data processing than the measurement unit and consumes more power.

  The network management unit 10 may be configured to add a natural energy power generation device. As the natural energy power generation device, a solar power generation device, a wind power generation device, a vibration power generation device, or the like can be used as appropriate. However, power generation to such an extent that the network management unit 10 can be driven without receiving electric supply from an external power source. It is preferable to have the ability. Therefore, the solar power generation device is particularly preferable because it is relatively inexpensive and has high power generation capability.

  When the network management unit 10 includes the battery B and the natural energy power generation device, various data can be collected and transmitted over a long period of time without using an external power source.

  The relay unit 40 includes an ad hoc wireless communication terminal and a storage battery (not shown). Note that, similarly to the components of the other wireless communication system 50, a configuration in which a natural energy power generation device is added to the relay unit 40 may be adopted.

  In this example, the relay unit 40 compensates for the shortage of the communication distance between each of the plurality of measurement units 21 to 24 and the network management unit 10, and also when the communication radio wave is difficult to reach due to the shield or the like. Used to secure a communication route by bypassing

  The data management server 60 obtains various measurement data through wide-area wireless communication with the network management unit 10, performs processing and analysis of the obtained measurement data, and executes processing to store in a storage area of a storage device provided therein. To do. In this example, the data management server 60 analyzes the measurement data stored in the measurement data DB 18 of the network management unit 10 through communication with the network management unit 10, for example, creates a radioactive substance diffusion prediction map, A process of storing information indicating the created radioactive substance diffusion prediction map as analysis result information in a predetermined storage area for a predetermined period is executed.

  The analysis of the measurement data by the data management server 60 may be executed by the data management server 60 independently according to the analysis program stored in the storage device of the data management server 60. For example, the administrator of the data management server 60 It is good also as a structure performed by these. Further, the data management server 60 may be capable of giving various instructions (for example, measurement data transmission instructions) to the network management unit 10 in accordance with an operation by an administrator of the data management server 60.

  The communication between the data management server 60 and the network management unit 10 can employ an Internet communication system or a satellite communication system via 3G or 4G wireless communication, which is a widely used communication infrastructure. Thereby, a large amount of information can be transmitted and received in a short time.

  The wireless LAN communication information terminal 70 is a device used for wireless LAN communication with the network management unit 10, accesses the measurement data DB 18 of the network management server 10A, and stores data such as radiation dose stored in the measurement data DB 18. (Measurement data) can be directly confirmed, and an instruction can be given to the network management unit 10.

  Therefore, even when wide-area wireless communication is not possible due to a large-scale disaster or accident, and data such as radiation dose cannot be obtained from the data management server 60, necessary measurement data is appropriately obtained from the network management unit 10. Since it can be obtained, it will be able to contribute to safety measures in the surrounding area. Further, if a communication format that is generally widespread, such as Wi-Fi communication, is adopted, a commercially available smartphone or personal computer can be used as an information terminal, which is convenient.

  In this example, the wireless LAN communication information terminal 70 executes processing for displaying the data stored in the measurement data DB 18 on the display screen of the display device provided therein. Further, the wireless LAN communication information terminal 70, when the analysis result information indicating the analysis result of the measurement data is created in the data management server 60, the network management unit 10 (the analysis result to the network management unit 10). When the information is stored, the analysis result information is acquired (from the network management unit 10), and the process of displaying the acquired analysis result information on the display screen of the display device provided therein is executed.

  In the radiation monitoring system 100, the wireless LAN communication terminal 70 can directly access the data management server 60 via the communication network 80 and acquire analysis result information indicating a radioactive substance diffusion map and the like. It is preferred that By providing a plurality of analysis result information acquisition paths, it becomes possible to improve the adaptability when a failure occurs in the communication environment.

  Next, the operation of the radiation monitoring system 100 of this example will be described.

  FIG. 4 is a flowchart illustrating an example of a radiation dose measurement process executed by the network management unit 10 (more specifically, the management server 10A included in the network management unit 10) and the measurement units 21 to 24 in the radiation monitoring system 100. is there. In the radiation dose measurement processing, measurement of radiation dose in the measurement units 21 to 24 and processing according to the measurement result are executed. Note that the contents of processes not particularly related to the present invention may be omitted. Hereinafter, the measurement unit 21 will be described as an example.

  The radiation dose measurement process is started when the network management unit 10 (or the management server 10A) is turned on.

  In the radiation dose measurement process, the measurement data transmission instructing unit 13 of the network management unit 10 (more specifically, the management server 10A; the same applies hereinafter) is transmitted to the measurement unit 21 (in this example, wireless communication of the measurement unit 21). Measurement setting information is transmitted to the terminal 31) (step S101). In this example, the measurement data transmission instructing unit 13 transmits the measurement setting information stored in advance as measurement setting information corresponding to the measurement unit 21 to the schedule DB 19.

  When the measurement unit 21 receives the measurement setting information, the measurement unit 21 starts measuring the radiation dose according to the received measurement setting information (step S102). Note that the measurement unit 21 stores the received measurement setting information in a storage area of a predetermined storage device.

  When the measurement is started, the measurement unit 21 determines whether or not the measurement data transmission time indicated by the measurement setting information (for example, 5 minutes from the start of measurement or 5 minutes from the last transmission of measurement data) has elapsed. (Step S103). If it is determined that the measurement data transmission time has not elapsed (N in step S103), the measurement unit 21 proceeds to the process in step S102.

  On the other hand, if it is determined that the measurement data transmission time has elapsed (Y in step S103), the measurement unit 21 uses the wireless communication terminal 31 to transmit data (measurement data) measured by a radiation sensor, an anemometer, or the like to the network management unit 10. Transmit (step S104).

  When receiving the measurement data, the data registration unit 12 of the network management unit 10 registers the received measurement data in the measurement data DB 18 (step S105).

  When the measurement data is registered, the radiation dose determination unit 15 of the network management unit 10 determines whether or not the radiation dose indicated by the measurement data is greater than or equal to a predetermined threshold (step S106). Here, when it is determined that the radiation dose indicated by the measurement data is not equal to or greater than the predetermined threshold (N in Step S106), the network management unit 10 proceeds to the process in Step S105.

  On the other hand, if it is determined that the radiation dose indicated by the measurement data is greater than or equal to the predetermined threshold (Y in step S106), the update target selection unit 17 of the network management unit 10 may select from the plurality of measurement units 21 to 24. A measurement unit for updating the associated measurement setting information is selected (step S107). In this example, the update target selection unit 17 includes a measurement unit 21 that has acquired measurement data for which the radiation dose is determined to be equal to or greater than a predetermined threshold, and a predetermined condition (for example, the measurement unit 21) with respect to the measurement unit 21. To a measurement unit that satisfies the ad hoc wireless communication within 1 hop). Hereinafter, the case where the measurement unit 22 is selected as the measurement unit that satisfies the predetermined condition will be described as an example.

  In addition, as a measurement unit condition for updating the measurement setting condition (that is, as a predetermined rule for selecting an update target), for example, two hops from the measurement unit 21 that has detected a radiation dose equal to or greater than a predetermined threshold value or It is good also as a structure in which it is determined that it is a measurement unit installed in the place further away.

  When the measurement units 21 and 22 are selected, the measurement setting information update unit 16 of the network management unit 10 measures the measurement associated with the selected measurement units 21 and 22 among the measurement setting information registered in the schedule DB 19. The setting information is updated so as to increase the measurement frequency of the radiation dose (for example, it is measured so as to be measured at intervals of 10 minutes in normal times, but is updated so as to be measured at intervals of 60 seconds) (step S108).

  When the measurement setting information is updated, the data transmission / reception unit 11 of the network management unit 10 transmits the updated measurement setting information to the measurement units 21 and 22 selected by the update target selection unit 17 (step S109). The process here is terminated. In this example, in response to the update of the measurement setting information, the network management unit 10 detects a process (for example, a radiation dose equal to or greater than a predetermined threshold value) set in advance according to the radiation dose indicated by the measurement data. For example, a process of creating warning information including position information indicating the designated place and transmitting it to a portable terminal possessed by the administrator of the radiation monitoring system 100).

  When the measurement unit 21 (not shown, but also the selected measurement unit 22) receives the measurement setting information, the measurement unit 21 stores the received measurement setting information in a predetermined storage area (step S110), and proceeds to the process of step S102. To do. The measurement unit 21 may be configured to overwrite the received measurement setting information on the previously stored measurement setting information, or may be configured to leave the measurement setting information before update. By adopting a configuration in which measurement setting information before update is left in at least one of the network management unit 10 and the measurement unit 21, for example, a higher-performance measurement unit is arranged at a position where the measurement setting information frequently changes. For example, the transition history of the measurement setting information can be used effectively.

  In order to prevent the measurement setting information from being frequently updated, for example, when the measurement setting information update unit 16 of the network management unit 10 updates the measurement setting information corresponding to a certain measurement unit, the updated measurement is performed. The configuration information may not be updated for a certain period.

  Next, measurement data display processing executed by the management server 10A of the network management unit 10 and the wireless LAN communication information terminal 70 (hereinafter referred to as “information terminal 70” as appropriate) in the radiation monitoring system 100 will be described. Note that the contents of processes not particularly related to the present invention may be omitted.

  FIG. 5 is a flowchart illustrating an example of measurement data display processing. The measurement data display process is started, for example, when the information terminal 70 receives a measurement data display request from the user of the information terminal 70.

  In the measurement data display process, first, the information terminal 70 accesses the network management unit 10 (step S201).

  When receiving an access from the information terminal 70, the network management unit 10 determines whether or not the information terminal 70 requests measurement data (step S202). If it is determined that the measurement data is requested (Y in step S202), the network management unit 10 reads out the measurement data corresponding to the requested content from the measurement data DB 18 and transmits it to the information terminal 70 (step S203). ), And the process here ends. At this time, the network management unit 10 may instruct the measurement units 21 to 24 to transmit the measurement data according to the requested content by the measurement data transmission instruction unit 13 of the management server 10A.

  When receiving the measurement data, the information terminal 70 displays a display screen (measurement data display screen) including the received measurement data on the display screen of the display device provided therein (step S204).

  Further, in this example, the information terminal 70 itself displays a display screen (analysis result information display screen) including analysis result information corresponding to the displayed measurement data in response to an operation input by the user of the information terminal 70, for example. The image is displayed on the display screen of the display device provided (step S205), and the process here is terminated.

  On the other hand, if it is determined in step S202 that access from the information terminal 70 does not request measurement data (N in step S202), the network management unit 10 performs other processing (for example, a user) according to the access contents. Registration etc.) is started (step S206), and the process here ends.

  As described above, in the above-described embodiment, a plurality of measurement units 21 to 24 that measure radiation dose and a communication network (for example, the measurement units 21 to 24, a data management server) with the measurement units 21 to 24 are used. 60, and a communication network including the wireless LAN communication information terminal 70. That is, in the radiation monitoring system 100 including the network management unit 10 that manages the communication network according to the measurement units 21 to 24, the measurement units 21 to 24 include The radiation dose is measured according to the measurement setting information indicating the radiation dose measurement frequency and the measurement data transmission frequency, the measured measurement data is transmitted to the network management unit 10, and the network management unit 10 is measured by the measurement units 21 to 24. Data to store the measured data B18, an information processing device (for example, data management server 60) that receives the measurement data transmitted by the measurement units 21 to 24, registers the received measurement data in the measurement data DB 18, and can display and analyze the measurement data And the wireless LAN communication information terminal 70) provide measurement data stored in the measurement data DB 18 by wireless communication (for example, send measurement data), and at least a part of the measurement units 21 to 24 and the network management unit 10 Since (or all of the measurement units 21 to 24 and the network management unit 10) can be driven by a battery, it is possible to provide a radiation monitoring system that facilitates installation of the measurement unit and can be driven independently in an emergency. It becomes like this.

  That is, for example, when installing a measurement unit equipped with a radiation sensor to monitor the amount of environmental radiation in the premises and surrounding areas of facilities that handle radioactive substances such as nuclear power plants, wiring work and special setting processing are performed. Since there is no need to perform this, the measurement unit can be easily installed. In addition, by using an apparatus that can be driven by a battery for each unit constituting the radiation monitoring system, it is possible to realize a radiation monitoring system that can be driven independently even when a power failure occurs.

  Even if the external power supply is interrupted due to a disaster or accident and the external information infrastructure such as mobile / fixed telephone lines and Internet lines becomes unusable, data such as environmental radiation doses at multiple measurement points can be obtained. To be able to provide a radiation monitoring system that can continue to be collected and can send collected data to an information terminal (for example, a general information terminal such as a personal computer or a smartphone) and can be driven independently in an emergency. Become.

  Further, by adopting a configuration in which the measurement unit includes a battery (or a storage battery if necessary), various data can be collected and transmitted over a long period of time without using an external power supply. .

  Although not particularly mentioned in the above-described embodiment, each unit constituting the radiation monitoring system 100 is not a battery at normal time (that is, when electricity is normally supplied). It is good also as a structure driven with the electric power supplied.

  In the above-described embodiment, the network management unit 10 manages the measurement setting information associated with each of the plurality of measurement units 21 to 24, and the measurement setting information (for example, Is transmitted to the measurement unit 21), the measurement unit receives the transmitted measurement setting information, stores the received measurement setting information in a storage area of a predetermined storage device, and measures the radiation dose according to the stored measurement setting information. With this configuration, the network management unit 10 can centrally manage the environment (for example, measurement frequency) for monitoring the radiation dose.

  In the above-described embodiment, the network management unit 10 determines whether the radiation dose indicated by the received measurement data is equal to or greater than a predetermined threshold (for example, step S106), and determines that the radiation dose is equal to or greater than the predetermined threshold. In addition, the measurement setting information being managed is updated to increase the measurement frequency of the radiation dose, and the measurement unit corresponding to the updated measurement setting information in response to the update of the measurement setting information (for example, the measurement unit 21). ), The updated measurement setting information is transmitted. Therefore, when a high radiation dose is detected, monitoring of the point is automatically performed (that is, for example, an operation by the administrator of the radiation monitoring system is not required). In) to be able to strengthen.

  In the above-described embodiment, when the network management unit 10 determines that the radiation dose is equal to or greater than a predetermined threshold, the measurement unit that updates the associated measurement setting information is selected according to a predetermined rule. In addition, since the measurement setting information associated with the selected measurement unit (for example, the measurement unit 21 and the measurement unit 22) is updated, not only a point where a high radiation dose is detected but also the surroundings are automatically monitored. Can be strengthened.

  In other words, the network management unit is equipped with a function that automatically adjusts the measurement cycle according to the measurement value of the radiation (radioactivity) intensity, and the measurement unit that measures the high radiation dose using the ad hoc wireless communication function is located. Since it is configured to take into account not only measurement points but also other neighboring measurement points, it is possible to follow a rapid change in radiation (radioactivity) level when the wind direction and wind speed change suddenly.

  In addition, when the radiation dose more than a predetermined threshold value is measured in one measurement unit 21, if the measurement frequency of all the other measurement units 22 to 24 constituting the wireless communication system 50 is increased, useless consumption of electricity is reduced. May occur. Therefore, the selection condition of another measurement unit (that is, the update target of measurement setting information) selected in response to a measurement unit measuring a high radiation dose is, for example, from a measurement unit that detects a high radiation dose, Measurement that is considered to be effective to increase the frequency of radiation dose measurement, such as a measurement unit installed at a location separated by a predefined number of hops, for example, 1 hop number or 2 hops or more. It is preferable to set so as to increase only the measurement frequency of the unit. By adopting such a configuration, it is possible to grasp the situation in which the radioactive substance moves or diffuses from the installation location of the measurement unit that has detected a high radiation dose, and to suppress wasteful power consumption. become able to.

  In the above-described embodiment, since the network management unit 10 is configured to communicate with an information processing apparatus (for example, the wireless LAN communication information terminal 70) via a wireless LAN, the information infrastructure does not function due to a disaster or the like. Measurement data can be provided even in situations.

  Further, in the above-described embodiment, the network management unit 10 is configured to perform communication with the information processing apparatus (for example, the wireless LAN communication information terminal 70) by ad hoc wireless communication, so that the information infrastructure does not function. Even in this case, the provision of measurement data can be continued effectively.

  In the above-described embodiment, the information processing apparatus includes the data management server 60 that manages various data (that is, the data management server 60 is included as an information processing apparatus that can communicate with the network management unit), and data Since the management server 60 analyzes the measurement data stored in the measurement data DB 18 of the network management unit 10 and registers the analysis result information indicating the analysis result in a predetermined storage area, the measurement data is effectively used. Will be able to. Further, when the network management unit 10 is driven by a battery, the power management of the network management unit 10 can be suppressed by causing the data management server 60 to perform analysis of measurement data.

  In the above-described embodiment, since the network management unit 10 is configured to communicate with the data management server 60 by Internet communication via a wide area wireless communication line, the communication efficiency of information can be improved. .

  In the above-described embodiment, the information processing apparatus includes a battery-driven information terminal (for example, the wireless LAN communication information terminal 70) (that is, the information processing apparatus that can communicate with the network management unit 10 is wireless. Since the information terminal displays the measurement data provided by the network management unit 10 on the display screen of the display device, the content of the measurement data can be confirmed by the information terminal. It becomes possible to contribute to safety measures at the time of disaster.

  In the above-described embodiment, the case where the network management unit 10 executes the radiation dose determination and the like has been described. However, the radiation dose determination process (for example, step S106) performed by the network management unit 10 and the update target are described. It is good also as a structure which each measurement unit 21-24 performs the selection process (for example, step S107). However, since priority should be given to the reduction of power consumption in the configuration of the measurement unit, it is preferable to provide the measurement unit with limited capability, and it is not recommended to include complex logic. In addition, when the determination logic is distributed to a plurality of distributed measurement units, it is difficult to update the determination logic. Further, if the determination function is provided on the measurement unit side, a large amount of communication with the network management unit occurs, resulting in a problem of increased power consumption. In the above-described embodiment, since the network management unit 10 is configured to make an update request creation determination by a simple method using a threshold value, it is possible to avoid mounting a complicated determination function in the network management unit 10. Power consumption can be suppressed.

<Second Embodiment>
In the second embodiment, the network management unit 10 can perform address management in the wireless communication system 50 including the network management unit 10, the plurality of measurement units 21 to 24, and the relay unit 40. That is, the second embodiment is different from the first embodiment in that the network management unit 10 executes a process for updating the address management table in accordance with the network status.

  Note that the second embodiment described below will be described focusing on the differences from the first embodiment described above. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Unless otherwise specified, the same components are assumed to be the same. Note that the components described here include the operation of the radiation monitoring system described above, and the description of the processing described in the example of the first embodiment may be omitted.

  FIG. 6 is a block diagram illustrating an example of the configuration of the network management unit 10 according to the second embodiment. As shown in FIG. 6, in this example, the network management unit 10 includes an address management unit (address confirmation unit 11B, address transmission request unit 12B, table update unit 13B, address group addition registration unit 14B, And a measurement unit network management server 10B (hereinafter referred to as a management server 10B) to which the address DB 15B) is added, and a battery B. The network management unit 10 including the management server 10B is included in the radiation monitoring system 100 exemplified in the description of the first embodiment.

  The address confirmation unit 11B executes determination processing for address confirmation. The address transmission request unit 12B executes processing for requesting the measurement units 21 to 24 (specifically, the wireless communication terminals 31 to 34) to transmit addresses. The table updating unit 13B executes processing for updating registration information in an address management table, which will be described later. The address group additional registration unit 14B executes processing for additionally registering an address group in the address management table. The address DB 15B is a storage medium that stores an address management table.

  Next, a network management method in the ad hoc wireless network of this example will be described.

  FIG. 7 is an explanatory diagram illustrating an example of an address management table stored in the address DB 15B included in the management server 10B. As illustrated in FIG. 7, the logical address, the network address, and the MAC address assigned to the management server 10 </ b> B and each of the wireless communication terminals 31 to 34 are stored in the address management table in association with each other.

  The “logical address” is an address that can be arbitrarily set by the system administrator of the system. In this example, it is assumed that logical addresses 0 to 9999 are used, 9999 logical addresses are assigned to the management server 10B, and one of 0 to 9998 is assigned to each of the wireless communication terminals 31 to 34 as a logical address. Shall.

  The “network address” is a 16-bit address that is uniquely and dynamically assigned in the corresponding network by the coordinator installed in the management server 10B. This “network address” is changed every time the user joins the ad hoc wireless network. The “MAC address” is a 64-bit address that is uniquely assigned at the time of device manufacture and is used in a fixed manner.

  In this example, in addition to the network address and the MAC address, logical addresses 0 to 9999 are assigned, and network management is performed using these three addresses. In this example, it is assumed that the application program operating on the management server 10B is designed to designate each wireless communication terminal 31 to 34 by a logical address.

  Communication data (packet data) from each of the wireless communication terminals 31 to 34 to the management server 10B includes only the network address among a plurality of addresses assigned to the transmission source wireless communication terminal. Therefore, when the management server 10B receives data from each of the wireless communication terminals 31 to 34, the management server 10B refers to the address management table and sets the logical address associated with the network address included in the received data to the transmission source. It is specified as the logical address of the wireless communication terminal. That is, the network management server 40 converts the network address of the source wireless communication terminal into a logical address, and executes various application programs.

  When data (packet data) is transmitted from the management server 10B to each of the wireless communication terminals 31 to 34, it is necessary to specify a network address among a plurality of addresses assigned to the transmission destination wireless communication terminal. Therefore, the management server 10B refers to the address management table stored in the address DB 15B and identifies the network address associated with the logical address of the wireless communication terminal as the transmission destination as the network address of the transmission destination wireless communication terminal. To do. In other words, the management server 10B performs a process of converting the logical address of the wireless communication terminal that is the transmission destination into a network address, and transmitting the data by designating the network address.

  In data communication between wireless communication terminals, a transmission source wireless communication terminal needs to specify a network address and a MAC address of a transmission destination wireless communication terminal.

  In the ad hoc wireless network (ZigBee wireless network) of this example, the network address assigned to each node may change depending on the state of the network. In this case, the newly assigned network address is not registered in the address management table. For this reason, although it becomes impossible to specify a logical address, the management server 10B of this example has a function of reconstructing an address management table in such a case. This function will be described in detail later.

  Next, the operation of the radiation monitoring system 100 of this example will be described.

  FIG. 8 is a flowchart showing an example of network management processing executed by the management server 10B of the network management unit 10 in the radiation monitoring system 100. In the network management process, a process for updating the address management table according to the network status is executed. Note that the contents of processes not particularly related to the present invention may be omitted. The network management process is started, for example, when the management server 10B is turned on.

  In the network management process, the address transmission request unit 12B of the management server 10B completes the activation after the power is turned on (Y in step S301), and sends an address transmission request by broadcast to all the wireless communication terminals 31 to 34. This is performed (step S302).

  Each of the wireless communication terminals 31 to 34 transmits its own address (logical address, network address, and MAC address) to the management server 10B in response to a request from the management server 10B.

  The data transmitting / receiving unit 11 of the management server 10B receives the addresses from the wireless communication terminals 31 to 34 (step S303). When the address from each wireless communication terminal 31 to 34 is received, the table updating unit 13B of the management server 10B updates the address management table by registering the received address of each wireless communication terminal 31 to 34 in the address management table. (Step S304). When a new address is included in the received address, the management server 10B additionally registers an address in the address management table by the address group addition registration unit 14B.

  Thereafter, the management server 10B determines whether or not a predetermined period (for example, 1 minute, 5 minutes, etc.) determined in advance has elapsed since the address management table was updated (step S305). If it is determined that a predetermined period has elapsed after the update of the address management table (Y in step S305), the management server 10B proceeds to the process in step S302 and executes a process for reconstructing the address management table. (Steps S302 to S304).

  On the other hand, if it is determined that the predetermined period has not elapsed after the address management table is updated (N in step S305), the management server 10B replaces and eliminates the measurement unit (exchanged measurement unit: specific Confirmation whether an address (logical address, network address, and MAC address) from a measurement unit (exchange measurement unit: specifically, a wireless communication terminal) having the same logical address as that of the wireless communication terminal is received. (Step S306a). Here, when it is confirmed that the address from the exchange measurement unit has not been received (N in Step S306a), the management server 10B proceeds to the process in Step S306b described later.

  On the other hand, when it is confirmed that the address from the exchange measurement unit has been received (that is, when the address is received) (Y in step S306a), the table updating unit 13B of the management server 10B uses the same logical address in the address management table. The address management table is updated by overwriting the address group of the exchanged measurement unit that is included with the address group of the newly received exchange measurement unit (step S307a). In the process of step S306a, the management server 10B refers to the address management table to check whether or not the same logical address as the logical address in the received address group has already been registered. Then, it is determined that an address group from the exchange measurement unit having the same logical address as the exchanged measurement unit has been received.

  Also, in this example, when a measurement unit fails, when the failed measurement unit is replaced with a new measurement unit with the same logical address (for example, when the power is turned on after replacement), the new replacement The measurement unit (exchange measurement unit) has a function of transmitting a plurality of addresses (logical address, network address, and MAC address) assigned to itself to the management server 10B.

  Next, the management server 10B confirms whether or not an address (logical address, network address, and MAC address) from a newly participating measurement unit (specifically, a wireless communication terminal) has been received (step S306b). Here, when it is confirmed that the address from the newly participating measurement unit has not been received (N in Step S306b), the management server 10B proceeds to the process in Step S308 described later.

  On the other hand, when it is confirmed that the address from the newly joined measurement unit has been received (Y in step S306b), the table updating unit 13B of the management server 10B adds the received address as the address of the newly added wireless communication terminal. By registering, the address management table is updated (step S307b). In the process of step S306b, the management server 10B refers to the address management table to check, for example, whether or not the same logical address as the logical address in the received address group has already been registered. Then, it is determined that the address group from the newly participating measurement unit has been received.

  In this example, when a wireless communication terminal newly participates (for example, when power is turned on), the wireless communication terminal manages a plurality of addresses (logical address, network address, and MAC address) assigned to the wireless communication terminal. It has a function to transmit to 10B.

  When the address management table is updated, the management server 10B confirms whether or not measurement data has been received from the measurement unit (step S308). Here, if it is confirmed that measurement data is not received from the measurement unit (N in step S308), the management server 10B proceeds to the process in step S305.

  On the other hand, when it is confirmed that the measurement data is received from the measurement unit (that is, when measurement data transmitted by the measurement unit (specifically, wireless communication terminal) is received) (Y in step S308), the address of the management server 10B The confirmation unit 11B confirms whether or not the address of the transmission source wireless communication terminal transmitted together with the received measurement data is normal (step 3309). The confirmation in step S309 is performed, for example, by confirming whether or not the network address of the transmission source wireless communication terminal is registered in the address management table, and if it is registered, it is determined to be normal. If it is not registered, it is judged as abnormal.

  If the address of the transmission source wireless communication terminal is abnormal (N in step S309), the management server 10B proceeds to step S302 and executes a process for reconstructing the address management table (step S302). To S304). In other words, when an address abnormality is detected, the management server 10B determines that the setting contents of the address management table are not reliable, and executes processing for reconstructing the address management table.

  On the other hand, when the address of the transmission source wireless communication terminal is normal (Y in step S309), the management server 10B performs a process of storing the received measurement data in a memory included in the management server 10B (step S310). In this example, the data registration unit 12 of the management server 10B registers the received measurement data in the measurement data DB 18.

  As described above, when the management server 10B is activated, when an address abnormality of the transmission source wireless communication terminal is detected, when an address (address group) is received from a new exchanged wireless communication terminal, from a newly participating wireless communication terminal When an address (address group) is received, processing for updating the address management table is executed. Note that the order of the processes of steps S306a to S306b and the processes of steps S307a to S307b may be reversed.

  In the above example, when the management server 10B transmits data to each wireless communication terminal, if the old network address is specified, the management server 10B says that the data does not reach the transmission destination. Since an error can be recognized, when such an error is recognized, processing for reconstructing the address management table may be executed (see steps S302 to S304).

  As described above, in the second embodiment described above, the measurement units 21 to 24 automatically construct an ad hoc wireless network, and the network management unit 10 (or the management server 10B) In the ad hoc wireless network constructed by ˜24, address groups of logical addresses, network addresses, and MAC addresses respectively assigned to distributed nodes having measurement units (for example, measurement units 21 to 24, wireless communication terminals 31 to 34). When the address DB 15B in which an address management table (see FIG. 7) is registered is received and data presenting an address including at least a network address among addresses assigned to itself is received from a distributed node, Address management table Refer to it to check whether the presented address is normal, and when it is determined that the presented address is not normal, send an address transmission request to all the distributed nodes and Since the address of each distributed node sent in response is registered in the address management table and the address management table is updated, address management capable of improving the processing efficiency at the application level can be performed. It becomes like this.

  That is, in the conventional ad hoc wireless communication network, address management is performed using a network address automatically assigned to a distributed node, so that there is a problem that a processing load on an application level increases. On the other hand, in the second embodiment described above, when it is determined that the address presented from the distributed node is not normal, an address transmission request is made to all the distributed nodes, and an address transmission request is made. It is possible to automatically reconstruct an address management table that has lost its reliability because the address management table is updated by registering the address of each distributed node sent in response to Thus, since the distributed node can be specified at the application level by the logical address with high reliability, address management capable of improving the processing efficiency at the application level can be performed.

  Therefore, more effective address management can be performed when one of a plurality of measurement units that construct an ad hoc wireless network fails due to a disaster or the like and the configuration of the ad hoc wireless network changes.

  In addition, when multiple measurement units are newly installed around facilities that handle radioactive materials in response to the occurrence of a large-scale disaster, application-level processing efficiency required for address management of measurement unit groups that construct an ad hoc wireless network By improving the above, it is possible to reduce the burden required for installing the measurement unit.

  In the second embodiment described above, the network management unit 10 (or the management server 10B) determines whether the presented network address is registered in the address management table as the network address of the distributed node that is the data transmission source. And the coordinator on the network management unit 10 (that is, the management node in the network) reassigns the network address due to a communication failure or the like. When the network address is changed, such as when the address management table is changed, it can be easily detected that the reliability of the address management table is lost, and the address management table can be automatically reconstructed.

  Further, in the second embodiment described above, even when the network management unit 10 (or the management server 10B) confirms that the data transmitted to the distributed node has not arrived, Therefore, it is possible to easily detect that the address management table has become unreliable, and the address management table can be automatically reconstructed.

  In the second embodiment described above, the network management unit 10 (or the management server 10B) receives the address group assigned to itself from the distributed node newly participating in the ad hoc wireless network. Since the received address group is additionally registered in the address management table as the address group of the source distributed node, the address group of the newly joined distributed node can be easily reflected in the address management table. become.

  Further, in the second embodiment described above, the network management unit 10 (or the management server 10B) is assigned to itself from the distributed node that participated by exchanging with the distributed node that was operating in the ad hoc wireless network. In response to receiving the address group, the address group including the same logical address as the logical address in the received address group is overwritten with the received address group, and the address group registered in the address management table is overwritten. Since the configuration is to be updated, when a distributed node is replaced, the address group of the distributed node excluded by the exchange registered in the address management table is easily updated to the address group of the distributed node that participated by the exchange. Will be able to.

  Further, in the second embodiment described above, even when the network management unit 10 (or the management server 10B) makes a predetermined period after the previous address transmission request is issued, Since the address transmission request is made, the address management table can be automatically rebuilt using the latest information every time a predetermined period elapses.

  Although not particularly mentioned in the first to second embodiments described above, the network management unit 10 performs measurement data or analysis including position information from the information processing apparatus (for example, the wireless LAN communication information terminal 70). Receives a request for providing result information (for example, prediction information inquiry mail with GPS information), and receives measurement data or analysis result information (for example, radiation (ability) intensity, radioactive substance) at a location indicated by the position information in response to the received request for provision (For example, automatically responding as a reply mail).

  Although not particularly mentioned in the first to second embodiments described above, as a method for the network management unit 10 to acquire measurement data from the measurement units 21 to 24 (that is, radiation measuring instruments), many radiations are used. It is good also as a structure which employ | adopts the method of reading the analog voltage output proportional to the measured value with which the apparatus is mounted. However, depending on the type of radiation measuring instrument, the voltage output range varies from 0 to 10 mV, 0 to 100 mV, and 0 to 2 V. Therefore, a variable gain amplifier that can be set to 1 time, 30 times, or 300 times is used. It is preferable to install and enable highly accurate reading regardless of the voltage output range. By adopting such a configuration, it is not necessary to unify the types of radiation devices that constitute the measurement units 21 to 24, so that restrictions on installation of the measurement units can be relaxed.

  Although not particularly mentioned in the first to second embodiments described above, the voltage output is proportional to the logarithm of the measured value depending on the model of the radiation measuring instrument constituting the measuring units 21 to 24. Therefore, the measurement units 21 to 24 may perform exponential calculation and convert the voltage value into the measurement value.

  Although not particularly mentioned in the first and second embodiments described above, an electronic switch (photo moss relay) is inserted in the connection cable between the built-in battery and the main body in order to reduce the power consumption of the radiation measuring instrument. The measurement units 21 to 24 may be configured to be capable of ON / OFF control. By adopting such a configuration, since the built-in battery is used, adjustment on the measurement unit side or the like becomes unnecessary even if the voltage of the battery changes depending on the model. In addition, since it takes about 30 to 60 seconds from when the power is turned on until the measured value is stabilized, it is preferable to read the measured output voltage thereafter.

  Although not particularly mentioned in the first to second embodiments described above, depending on the type of the radiation measuring instrument, external power supply by an AC adapter or the like may be necessary. The variable voltage type DC-DC converter may be mounted on the power source, and power may be supplied from the power sources (for example, solar cells and Li-ion batteries) of the measurement units 21 to 24 to the radiation measuring instrument.

  Although not particularly mentioned in the first to second embodiments described above, the measurement of the wind direction by the measurement units 21 to 24 classifies the measurement values per second into 16 directions, and the past 10 minutes (variable). It is good also as a structure which employ | adopts the system recorded as appearance frequency.

  Although not particularly mentioned in the first to second embodiments described above, even when each of the measurement units 21 to 24 is equipped with an information storage medium such as a microSD memory, wireless communication becomes defective. Alternatively, the measurement data may not be lost.

  Although not particularly mentioned in the first to second embodiments described above, a promising method for arranging the measurement (/ relay) unit is easy to secure solar energy and ad hoc wireless communication paths such as on the roof of a building. This is a mode in which a relay unit with relatively large power consumption is disposed at a certain place, and a measurement unit that operates in a low power consumption mode is disposed on the surrounding ground. That is, it is preferable that the installation location of the measurement / relay unit is a rooftop of a building that can secure the prospect of each other (that is, other measurement / relay units) and has little shade.

  In the above-described first embodiment, when the measurement units 21 to 2N measure their own radiation and the radiation dose is equal to or greater than a predetermined threshold value, the measurement units 21 and 2N update their own measurement setting information. Although the case where notification is performed has been described as an example, the order of processing is not limited to this, and the measurement unit 21 may update another measurement unit before updating its own measurement setting information (or in conjunction with the update process). It is good also as a structure which performs the process (for example, step S110) for notification.

  Although not particularly mentioned in the first to second embodiments described above, the content of the measurement setting information may include a communication method of the measurement unit. Then, for example, the measurement setting information update unit 16 transmits measurement setting information corresponding to one measurement unit by “transmitting information indicating that the measurement setting information is changed to a predetermined content by broadcast communication limited to hops”. It is good also as a structure updated to the content containing. In such a configuration, when the network management unit 10 updates measurement setting information corresponding to a measurement unit that has detected a radiation dose equal to or greater than a predetermined threshold, for example, the updated measurement setting information is more than before the update. Updated to indicate that high measurement frequency (for example, measurement interval shorter than before update) and that information indicating that the measurement setting information is to be changed so as to increase the measurement frequency is transmitted by hop-limited broadcast communication By adopting such a configuration, it becomes possible to omit processing (for example, step S107) for selecting another measurement unit, and it is possible to save power consumption required for the selection processing.

  Further, although not particularly mentioned in the first to second embodiments described above, the radiation monitoring system 100 includes storage devices included in the measurement units 21 to 24, the network management unit 10, and the data management server 60, respectively. By adopting a configuration for accumulating measurement data, the risk of loss of measurement data can be reduced.

  In the first and second embodiments described above, the network management unit 10 (or the management servers 10A and 10B) and the measurement units 21 to 24 each have a control program stored in its own storage medium ( Various processes described above are executed according to a network management program or a measurement program.

  In the first to second embodiments described above, the radiation monitoring system 100 that collects and manages measurement data has been described as an example. However, the embodiment of the present invention is not limited to this, and wireless communication is used. Any system including a wireless communication system 50 that performs data communication may be used.

  INDUSTRIAL APPLICABILITY According to the present invention, it is useful to provide a radiation monitoring system in which a measurement unit can be easily installed and can be driven independently in an emergency.

B battery 10 network management unit 10A, 10B measurement unit network management server (management server)
DESCRIPTION OF SYMBOLS 11 Data transmission / reception part 12 Data registration part 13 Measurement data transmission instruction | indication part 14 Measurement setting information management part 15 Radiation dose determination part 16 Measurement setting information update part 17 Update object selection part 18 Measurement data DB
19 Schedule DB
11B Address confirmation unit 12B Address transmission request unit 13B Table update unit 14B Address group additional registration unit 15B Address DB
21-24 Measuring unit 31-34 Wireless communication terminal 40 Relay unit 50 Wireless communication system 60 Data management server 70 Wireless LAN communication information terminal 80 Communication network 100 Radiation monitoring system

Claims (15)

A radiation monitoring system comprising a plurality of measurement units for measuring radiation dose, and a network management unit for managing a communication network with the measurement unit,
The measurement unit is
Measuring means for measuring the radiation dose according to measurement setting information indicating the measurement frequency of radiation dose and the transmission frequency of measurement data;
Measurement data transmission means for transmitting measurement data measured by the measurement means to the network management unit,
The network management unit is:
Measurement data storage means for storing measurement data measured by the measurement means of the measurement unit;
Measurement data reception means for receiving measurement data transmitted by the measurement data transmission means of the measurement unit;
Measurement data registration means for registering the measurement data received by the measurement data receiving means in the measurement data storage means;
A wireless communication means for providing wireless communication with the measurement data stored in the measurement data storage means for an information processing apparatus capable of displaying and analyzing the measurement data;
A radiation monitoring system, wherein at least part of the measurement unit and the network management unit can be driven by a battery. The network management unit is:
Measurement setting information management means for managing the measurement setting information associated with each of the plurality of measurement units;
Measurement setting information transmission means for transmitting measurement setting information managed by the measurement setting information management means to the plurality of measurement units,
The measurement unit is
Measurement setting information receiving means for receiving the measurement setting information transmitted by the measurement setting information transmitting means;
Measurement setting information storing means for storing measurement setting information received by the measurement setting information receiving means in a storage area of a predetermined storage device,
The radiation monitoring system according to claim 1, wherein the measurement unit measures the radiation dose according to measurement setting information stored by the measurement setting information storage unit. The network management unit is:
A radiation dose determining means for determining whether the radiation dose indicated by the measurement data received by the measurement data receiving means is greater than or equal to a predetermined threshold;
Measurement setting information for updating the measurement setting information managed by the measurement setting information management means so as to increase the measurement frequency of the radiation dose when the radiation dose is determined to be greater than or equal to the predetermined threshold by the radiation dose determination means. Update means,
The measurement setting information transmitting unit transmits the updated measurement setting information to a measurement unit corresponding to the updated measurement setting information in response to the measurement setting information being updated by the measurement setting information updating unit. The radiation monitoring system according to claim 2. The network management unit is:
Update target selection means for selecting a measurement unit for updating the associated measurement setting information according to a predetermined rule when the radiation dose is determined to be greater than or equal to the predetermined threshold by the radiation dose determination means. Including
The radiation monitoring system according to claim 3, wherein the measurement setting information update unit updates the measurement setting information associated with the measurement unit selected by the update target selection unit. The radiation monitoring system according to any one of claims 1 to 4, wherein the wireless communication unit of the network management unit communicates with the information processing apparatus through a wireless LAN. The radiation monitoring system according to any one of claims 1 to 4, wherein the wireless communication unit of the network management unit communicates with the information processing apparatus by ad hoc wireless communication. The information processing apparatus includes a data management server that manages various data,
The data management server
Measurement data analysis means for analyzing measurement data stored in the measurement data storage means of the network management unit;
The radiation monitoring system according to any one of claims 1 to 6, further comprising analysis result information registration means for registering analysis result information indicating an analysis result obtained by the measurement data analysis means in a predetermined storage area. The wireless communication means of the network management unit includes:
The radiation monitoring system according to claim 7, wherein the radiation monitoring system communicates with the data management server by Internet communication via a wide area wireless communication line. The information processing apparatus includes a battery-driven information terminal,
The radiation monitoring system according to any one of claims 1 to 8, wherein the information terminal includes display means for displaying measurement data provided by wireless communication means of the network management unit on a display screen of a display device. The measurement unit includes network construction means for automatically constructing an ad hoc wireless network,
The network management unit is:
In an ad hoc wireless network constructed by the network construction means of the measurement unit, an address management table in which an address group of logical addresses, network addresses, and MAC addresses respectively assigned to distributed nodes having the measurement unit is registered is stored. Address storage means,
Whether or not the presented address is normal with reference to the address management table when receiving data presenting an address including at least a network address among a group of addresses allocated to the self from the distributed node An address confirmation means to confirm;
An address transmission request means for making an address transmission request to all distributed nodes in response to determining that the address presented by the address confirmation means is not normal;
The table update means for registering the address of each distributed node transmitted in response to the address transmission request in the address management table and updating the address management table. The radiation monitoring system described. The address confirmation means confirms whether or not the presented network address is registered in the address management table as the network address of the distributed node of the data transmission source, and the address presented when it is not registered is not normal The radiation monitoring system according to claim 10. The network management unit includes non-delivery confirmation means for confirming that the data transmitted to the distributed node has not arrived;
The radiation monitoring system according to claim 10 or 11, wherein the address transmission request unit makes an address transmission request to all the distributed nodes even when data non-delivery is confirmed by the non-delivery confirmation unit. The network management unit receives the address group assigned to itself from a distributed node newly participating in the ad hoc wireless network, and uses the received address group as an address group of a source distributed node. The radiation monitoring system according to claim 10, further comprising address group additional registration means for additionally registering in the management table. In response to receiving the address group assigned to itself from the distributed node that participated by exchanging with the distributed node that was operating in the ad hoc wireless network, the network management unit in the received address group The address group update registration means for overwriting an address group including the same logical address as the logical address with the received address group and updating the address group registered in the address management table. A radiation monitoring system according to any one of the above. 15. The address transmission request unit makes an address transmission request to all the distributed nodes even when a predetermined period has elapsed after making a previous address transmission request. Radiation monitoring system.

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