CN109061717B - Nuclear radiation scale laboratory one-key calibration control system and control method thereof - Google Patents
Nuclear radiation scale laboratory one-key calibration control system and control method thereof Download PDFInfo
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- CN109061717B CN109061717B CN201810866273.2A CN201810866273A CN109061717B CN 109061717 B CN109061717 B CN 109061717B CN 201810866273 A CN201810866273 A CN 201810866273A CN 109061717 B CN109061717 B CN 109061717B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/005—Details of radiation-measuring instruments calibration techniques
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/15—Plc structure of the system
- G05B2219/15018—Communication, serial data transmission, modem
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/15—Plc structure of the system
- G05B2219/15027—RS485, MPI multipoint interface, multiple transmitters, receivers connected
Abstract
The invention relates to the technical field of nuclear radiation protection, and provides a one-key calibration control system for a nuclear radiation scale laboratory and a control method thereof, wherein the system comprises an operation station, a controller, a data processing and displaying unit, a radioactive source control device and a trolley, wherein the radioactive source control device is used for placing one or more radioactive sources, controlling the searching and exposing of the radioactive sources to establish a standard field and shielding the radioactive sources to close the standard field; the trolley is used for placing the instrument to be calibrated and adjusting the distance between the instrument to be calibrated and the radioactive source; according to the method, the data acquisition records and the final scale coefficients of the true values to be calibrated can be obtained only by selecting the true values to be calibrated according to the range of the instrument, pressing a one-key calibration starting button and waiting for the completion of calibration, and the method is simple to operate and high in reliability.
Description
Technical Field
The invention relates to the technical field of nuclear radiation protection, in particular to a nuclear radiation scale laboratory one-key calibration control system and a control method thereof.
Background
In a traditional nuclear radiation calibration laboratory, a standard field is established in a calibration chamber, and a trolley capable of freely adjusting the distance from a radiation source is arranged. The instrument to be calibrated is arranged on the trolley object stage and is externally connected with a data processing and displaying unit. The data processing display unit is arranged outside the calibration chamber to observe the radiation dose rate value measured by the instrument. And the operating station issues instructions to control the trolley to move and the radioactive source to be switched according to the agreed true value to be calibrated, so that the trolley runs for a certain distance and the radioactive source stops when being switched to a corresponding source position. And the observation data processing and displaying unit records the radiation rate data at the moment. And comparing the appointed true value of the standard field in the state with the average value of the data measured for many times, and calculating to obtain the calibration parameter of the instrument. The radiation rate data for the remaining default true values to be calibrated are then recorded and the calibration parameters are calculated in the same manner.
In general, the above method requires controlling the trolley to move and control the radioactive source to search the source, then manually recording the data measured by the instrument, calculating the average value of the data, and then comparing the average value with the agreed true value to obtain the calibration parameter of the agreed true value. In the case where there are multiple true values of the contract to be calibrated, this process needs to be repeated multiple times. The whole calibration process is more in manual participation, is very complicated and is easy to make mistakes.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a nuclear radiation scale laboratory one-key calibration control system and a control method thereof.
The purpose of the invention is realized by the following technical scheme: a nuclear radiation scale laboratory one-key calibration control system comprises an operation station, a controller, a data processing display unit, a radioactive source control device and a trolley;
the operating station comprises an upper computer and matched upper computer software for displaying data and issuing instructions;
the controller comprises a processor and two communication modules, the processor processes data and instructions and controls the trolley to move, the first communication module is configured as a Modbus master station and acquires radiation dose rate data of the data processing display unit, and the second communication module is configured as a Modbus slave station and exchanges data and receives instructions with the operating station;
the data processing and displaying unit is connected with an instrument to be calibrated so as to realize the on-site acquisition of radiation dose rate data;
the radioactive source control device is used for placing one or more radioactive sources, controlling to search sources and expose the radioactive sources to establish a standard field and shielding the radioactive sources to close the standard field;
the trolley is used for placing the instrument to be calibrated and adjusting the distance between the instrument to be calibrated and the radioactive source.
In the technical scheme, the processor is Siemens S7-CPU-1214C, and the communication module is Siemens S7-CM-1241.
In the technical scheme, the radioactive source control device adopts a turntable structure, a plurality of shielding chambers are uniformly distributed on the circumference of the turntable, each radioactive source is independently placed in one shielding chamber of the turntable, each shielding chamber is provided with a shielding door, the turntable is controlled by a motor to rotate, the shielding doors are controlled to be opened or closed, the motor is connected with an upper computer, and the radioactive source control device stops when the radioactive source control device needs to search a source and transfers to a corresponding source position.
In the technical scheme, the trolley comprises an instrument platform for placing the instrument to be calibrated and a walking mechanism, the walking mechanism is controlled to walk by a motor, and the motor is connected with an upper computer. When the source needs to be found, the trolley is controlled by the motor to run for a certain distance and then stops.
The invention also provides a control method of the nuclear radiation scale laboratory one-key calibration control system, which comprises the following steps:
(1) fixing the instrument to be calibrated on a trolley instrument desk, configuring a network in a controller, and closing a shielding door of a laboratory after safe clearing;
(2) selecting n appointed true values to be calibrated according to the range of the meter to be calibrated; the true value of the appointment to be calibrated corresponds to the specific absolute value of the radioactive source number and the trolley running distance, and the true value of the appointment to be calibrated can be obtained only by searching the distance between the radioactive source and the trolley running to the absolute value;
(3) selecting n confirmed appointed true values to be calibrated at the operation station, pressing a one-key calibration starting button, and starting calibration;
(4) the trolley operation and radioactive source control device stops after rotating to search a source to the 1 st agreed truth value to be calibrated A1, the controller automatically records real-time dose rate data acquired by the data processing display unit once every t seconds, 10 times are totally recorded, the average value B1 of the 10 times of recording is calculated, and the calibration parameter is C1= A1/B1;
(5) the trolley operation and radioactive source control device stops after rotating to search the source to the 2 nd agreed truth value to be calibrated A2, the controller automatically records the real-time dose rate data acquired by the data processing display unit once every t seconds, 10 times are totally recorded, the average value B2 of the 10 times of recording is calculated, and the calibration parameter is C2= A2/B2;
(6) repeating the operation until the trolley runs and the radioactive source control device rotates to search the source to the nth agreed truth value An to be calibrated, stopping the operation, automatically recording the real-time dose rate data acquired by the data processing display unit once every t seconds by the controller for 10 times in total, and calculating the average value Bn of the 10 times of recording to obtain the calibration parameter Cn = An/Bn;
(7) the scale coefficient value C = (C1+ C2+ … Cn)/n at this time is calculated by the processor.
In the technical scheme, the instrument to be calibrated has a certain range, the appointed true value to be calibrated needs to be determined in the range before calibration, and the appointed true value to be calibrated is realized by selecting different radioactive sources and distance values of the different instruments from the radioactive sources and passes through points which are calibrated in a standard field by the national standard calibration instrument.
In the above technical solution, the value of n in steps (2), (3) and (6) is an integer greater than or equal to 3, and is generally 3.
In the above technical solution, the value of t in steps (4), (5), and (6) is 10 seconds.
In the above technical solution, the process of controlling the operation of the trolley is as follows:
in the controller, each appointed true value to be calibrated corresponds to one trolley running distance value, the operating station selects three appointed true values, and the controller obtains signals of the three appointed true values so as to determine the three running distance values of the trolley; respectively writing the three running distance values into three absolute position motion modules according to the sequence of the selected appointed true value to be calibrated; the first-time running trolley uses a 'one-key calibration start' button signal as a mark bit for starting running the trolley; the second and later operation trolleys use the signal of the last data record as the flag bit of the starting operation trolley, thus realizing that the automatic operation trolley reaches the appointed position.
In the above technical solution, the process of controlling the radiation source control device to rotate and search the source is as follows:
in the controller, each appointed true value to be calibrated corresponds to one radioactive source, the operating station selects three appointed true values, and the controller obtains signals of the three appointed true values so as to determine the number of the three radioactive sources; setting a source searching marker bit of a radioactive source number according to the sequence of selecting an appointed truth value to be calibrated when source searching is needed each time, resetting the source searching marker bit by using a digital quantity input signal from the source to the bit of the number after each source searching is finished, and using a 'one-key calibration start' button signal as a marker bit for starting the source searching for the first time of source searching; and the second and later searching uses the signal of the last data record as the mark bit of starting searching, thus realizing automatic searching.
Compared with the prior art, the invention has the following advantages:
1. and selecting a true value of the convention to be calibrated, and after one-key calibration is started, no other operation is needed.
2. Data are automatically recorded, and files are conveniently formed; and automatically processing the data to obtain a final calibration coefficient.
3. And after reaching the true value of the convention to be calibrated, recording data at a time interval of t, and aiming at ensuring that the acquired data is more reliable after the detector is sufficiently stable.
Drawings
Fig. 1 is a schematic diagram of the construction of the system of the present invention.
Fig. 2 is a schematic view of the arrangement of buttons of the operation station of the present invention.
FIG. 3 is a schematic diagram of a configured Modbus master station in the invention.
FIG. 4 is a schematic diagram of a configured Modbus slave station in the invention.
Fig. 5 is a schematic diagram of an absolute position movement module of the control trolley according to the invention.
FIG. 6 is a schematic diagram of a source finding motion module according to the present invention.
Fig. 7 is a schematic diagram of the setting of the sampling interval time in the present invention.
FIG. 8 is a diagram illustrating the condition and configuration of interrupts entering at the true value of the first contract to be calibrated according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
This example sets up a test environment as shown in figure 1. The system mainly comprises an operation station, a controller, a data processing and displaying unit, a detector to be calibrated, a trolley and a source shielding device. The communication modules are connected by RS-485 serial ports, the trolley carries the detector to be calibrated, the controller receives an instruction of the operating station, then the trolley is controlled to move to change the distance between the detector and the radioactive source, and standard fields with different sizes are obtained at different distances and used for calibrating the detector.
Fig. 2 is a schematic view of the button arrangement of the operation station. The first row of buttons and the second row of buttons are appointed truth values to be selected, the appointed truth values are calibrated by a national standard instrument, and the accuracy is high. Each appointed true value corresponds to a determined radioactive source number and a determined absolute value of the distance between the trolley and the radioactive source. After three values to be calibrated are selected, a 'one-key calibration start' button is pressed, and then the calibration operation is started. When the 'one-key calibration stop' button is pressed, the current calibration operation is stopped.
FIG. 3 shows a configuration Modbus master station, which realizes data collection. The first module is used for setting a communication mode. The communication mode adopts serial communication, the baud rate is 9600, and no check bit exists. The second module is used to set the sending mode of the request for reading data. "M0.1/Clock _5 Hz" is a 5Hz pulse, which means that a data request instruction is sent five times per second to read data, and then the data is stored at the position of "DB1. DBD28/DT1.Soc _ Pst". DB1.DBD28 is the two-word address starting at byte 28 in the DB1 global data block. A "MB _ ADDR" of 1 indicates that the slave address of the data processing display unit is 1. The combination of "MODE", "DATA _ ADDR" and "DATA _ LEN" indicates that 2 words of DATA starting at address 1 of the collected DATA processing display unit are read, and the 2 words of DATA are the value of the radiation dose rate by default.
FIG. 4 shows a configuration Modbus slave station, which realizes data exchange with an operating station. The first module is used for setting a communication mode. The communication mode adopts serial communication, the baud rate is 9600, and no check bit exists. The second module is a block for setting slave station addresses and allowing access. "MB _ ADDR" is 2 slave address of controller is 2. "MB _ HOLD _ REG" TO "DB 16/Date _ PLC _ TO _ PC" means that the operator station is allowed TO access the DB16 data block. The data includes instructions for controlling the movement of the trolley, acquired dose rate data, results obtained after data processing, and the like.
Fig. 5 is a control trolley absolute position movement module. "Axis" is "DB 2" and indicates that the object requiring absolute value movement is the process Axis "translation Axis" of the configuration. The configured translation axis object comprises parameters such as the running distance of the trolley when the motor runs for one circle, the running rule of the original point position of the trolley and the like, and the parameters are the basis of the absolute value running of the trolley. "Execute" is "DB16. DBX206.0/one-touch calibration Start" means that a one-touch run is initiated, this instruction coming from the operator station button, as shown in FIG. 2. The second movement instruction of the trolley comes from the completion of the first data recording. "Positon" is "DB1. DBD78/DT1. distance _ 1" represents the absolute distance that the trolley travels for the first time. After the operating station selects the first default true value to be calibrated, the distance between the trolley and the radioactive source corresponding to the default true value is written into the address DB1.DBD78/DT1. distance _1 before control, and the absolute position movement module is instructed to operate according to the distance. The absolute distance between the second and third runs is the same.
Fig. 6 is a sourcing motion module. The designated radioactive source is searched when one-key calibration is started, the first to-be-calibrated engagement truth value is calibrated and the second to-be-calibrated engagement truth value is calibrated. The source searching adopts a circular operation mode and operates at a constant speed, DB23 is a background data block of the source searching module, and related parameters of the constant speed operation are configured inside the source searching module. "Axis" is "DB 17/sourcing Axis" and means that the object of the sourcing action is the process Axis "sourcing Axis" of the configuration. The sourcing action is initiated after the one-touch calibration is initiated and the sourcing axis is rotated at a speed of 10/s. And stopping the source searching action after the corresponding source is searched. "DB1. DBW98/DT1.RD _ COUNT" is a count of recorded data, which starts at 0 and ends at 29, and records 30 data of three contract true values to be calibrated. When "db1. dbw98" is "10", it indicates that the first group of data is recorded, and the second sourcing is started. When "db1. dbw98" is "20", it indicates that the second group of data is recorded, and a third sourcing is started.
Fig. 7 is a setting of the sampling interval time. When sampling is in progress, "db1. dbd104/dt1. sample time" holds the time interval of writing, which is 10 seconds in this example, i.e., "db1. dbx103.3/dt1. sample" is set once every 10 seconds, for entering an interrupt to collect data once.
FIG. 8 illustrates the condition and configuration of an interrupt at the first true value of the contract to be calibrated. During the first true value calibration of the convention to be calibrated, the trolley finishes running and the source searching finishes running, and then the 20-numbered interrupt organization block can be entered in the sampling period. The second and third protocol truth values to be calibrated work the same.
Each time an interrupt is entered, the collected Data is stored in an array named Dest _ D [0..29] inside the Data block named Data _ from _ PDU in one element, storing the address instruction +1 of the latter array in preparation for the next storage. And then processing the obtained 30 data to obtain the final scale factor.
Wherein: the control trolley absolute position motion module, the source searching motion module, the setting of sampling interval time, the condition and configuration of interruption at the position of an appointed true value to be calibrated, data storage and the like are all realized by a processor.
The specific calibration procedure of this embodiment is as follows:
(1) configuring a network in a controller according to the diagram shown in FIG. 1, arranging equipment, closing a shielding door of a laboratory after safety is confirmed;
(2) selecting 3 appointed truth values to be calibrated according to the measuring range of the detector to be calibrated;
(3) selecting 3 confirmed appointed true values to be calibrated at an operation station, pressing a 'one-key calibration starting' button, and starting calibration;
(4) the trolley and the radioactive source control device stop after running to the 1 st default true value A1 to be calibrated, the controller automatically records the real-time dose rate data acquired by the data processing and displaying unit every 10 seconds, 10 times in total, and calculates the average value B1 of the 10 times of recording to obtain the calibration parameter of the trolley and the radioactive source control device as C1= A1/B1;
(5) the trolley and the radioactive source control device stop after running to the 2 nd default true value A2 to be calibrated, the controller automatically records the real-time dose rate data acquired by the data processing and displaying unit every 10 seconds, 10 times in total, and calculates the average value B2 of the 10 times of recording to obtain the calibration parameter of the trolley and the radioactive source control device as C2= A2/B2;
(6) the trolley and the radioactive source control device stop after running to the 3 rd appointed truth value An to be calibrated, the controller automatically records the real-time dose rate data acquired by the data processing and displaying unit every 10 seconds, 10 times are recorded in total, the average value B3 of the 10 times of recording is calculated, and the calibration parameter is C3= A3/B3;
(7) the scale coefficient value C = (C1+ C2+ C3)/3 at this time can be obtained through calculation of the processor.
Details not described in the present specification belong to the prior art known to those skilled in the art.
The above examples of the present invention are provided for illustrative clarity and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications of the present invention are within the scope of the present invention.
Claims (8)
1. A nuclear radiation scale laboratory one-key calibration control system which is characterized in that: the system comprises an operation station, a controller, a data processing and displaying unit, a radioactive source control device and a trolley;
the operating station comprises an upper computer and matched upper computer software for displaying data and issuing instructions;
the controller comprises a processor and two communication modules, the processor processes data and instructions, controls the trolley to move and controls the radioactive source control device to search a source, the first communication module is configured as a Modbus master station and acquires radiation dose rate data of the data processing display unit, and the second communication module is configured as a Modbus slave station and exchanges data and receives instructions with the operating station;
the data processing and displaying unit is connected with an instrument to be calibrated so as to realize the on-site acquisition of radiation dose rate data;
the radioactive source control device is used for placing one or more radioactive sources, controlling to search sources and expose the radioactive sources to establish a standard field and shielding the radioactive sources to close the standard field; the radioactive source control device adopts a turntable structure, a plurality of shielding chambers are uniformly distributed on the circumference of the turntable, each radioactive source is independently placed in one shielding chamber of the turntable, a shielding door is matched with the shielding chamber, the turntable is controlled to rotate by a motor, the shielding door is controlled to be opened or closed, and the motor is connected with an upper computer;
the trolley is used for placing the instrument to be calibrated and adjusting the distance between the instrument to be calibrated and the radioactive source.
2. The nuclear radiation scale laboratory one-touch calibration control system of claim 1, wherein: the processor is Siemens S7-CPU-1214C, and the communication module is Siemens S7-CM-1241.
3. The nuclear radiation scale laboratory one-touch calibration control system of claim 1, wherein: the trolley comprises an instrument platform for placing the instrument to be calibrated and a walking mechanism, the walking mechanism is controlled by a motor to walk, and the motor is connected with an upper computer.
4. A method of controlling the nuclear radiation scale laboratory one-touch calibration control system of claim 1, comprising the steps of:
(1) fixing the instrument to be calibrated on a trolley instrument desk, configuring a network in a controller, and closing a shielding door of a laboratory after safe clearing;
(2) selecting n appointed true values to be calibrated according to the range of the meter to be calibrated; the true value of the appointment to be calibrated corresponds to the specific absolute value of the radioactive source number and the trolley running distance, and the true value of the appointment to be calibrated can be obtained only by searching the distance between the radioactive source and the trolley running to the absolute value;
(3) selecting n confirmed appointed true values to be calibrated at the operation station, pressing a one-key calibration starting button, and starting calibration;
(4) the trolley operation and radioactive source control device stops after rotating to search a source to the 1 st agreed truth value to be calibrated A1, the controller automatically records real-time dose rate data acquired by the data processing display unit once every t seconds, 10 times are totally recorded, the average value B1 of the 10 times of recording is calculated, and the calibration parameter is C1= A1/B1;
(5) the trolley operation and radioactive source control device stops after rotating to search the source to the 2 nd agreed truth value to be calibrated A2, the controller automatically records the real-time dose rate data acquired by the data processing display unit once every t seconds, 10 times are totally recorded, the average value B2 of the 10 times of recording is calculated, and the calibration parameter is C2= A2/B2;
(6) repeating the operation until the trolley runs and the radioactive source control device rotates to search the source to the nth agreed truth value An to be calibrated, stopping the operation, automatically recording the real-time dose rate data acquired by the data processing display unit once every t seconds by the controller for 10 times in total, and calculating the average value Bn of the 10 times of recording to obtain the calibration parameter Cn = An/Bn;
(7) the scale coefficient value C = (C1+ C2+ … Cn)/n at this time is calculated by the processor.
5. The control method of the nuclear radiation scale laboratory one-touch calibration control system according to claim 4, characterized in that: and (3) in the steps (2), (3) and (6), the value of n is an integer which is more than or equal to 3.
6. The control method of the nuclear radiation scale laboratory one-touch calibration control system according to claim 4, characterized in that: and (4), the value of t in the steps (4), (5) and (6) is 10 seconds.
7. The control method of the nuclear radiation scale laboratory one-touch calibration control system according to claim 4, characterized in that: the operation process of the control trolley is as follows:
in the controller, each appointed true value to be calibrated corresponds to one trolley running distance value, the operating station selects three appointed true values, and the controller obtains signals of the three appointed true values so as to determine the three running distance values of the trolley; respectively writing the three running distance values into three absolute position motion modules according to the sequence of the selected appointed true value to be calibrated; the first-time running trolley uses a 'one-key calibration start' button signal as a mark bit for starting running the trolley; the second and later operation trolleys use the signal of the last data record as the flag bit of the starting operation trolley, thus realizing that the automatic operation trolley reaches the appointed position.
8. The control method of the nuclear radiation scale laboratory one-touch calibration control system according to claim 4, characterized in that: the process of controlling the rotation and the source searching of the radioactive source control device is as follows:
in the controller, each appointed true value to be calibrated corresponds to one radioactive source, the operating station selects three appointed true values, and the controller obtains signals of the three appointed true values so as to determine the number of the three radioactive sources; setting a source searching marker bit of a radioactive source number according to the sequence of selecting an appointed truth value to be calibrated when source searching is needed each time, resetting the source searching marker bit by using a digital quantity input signal from the source to the bit of the number after each source searching is finished, and using a 'one-key calibration start' button signal as a marker bit for starting the source searching for the first time of source searching; and the second and later searching uses the signal of the last data record as the mark bit of starting searching, thus realizing automatic searching.
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| CN109061717A (en) | 2018-12-21 |
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