CN111105886A - Calibration-free temperature measurement method and device under strong radiation environment - Google Patents
Calibration-free temperature measurement method and device under strong radiation environment Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 claims abstract description 23
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- 238000006073 displacement reaction Methods 0.000 claims description 35
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- 238000009530 blood pressure measurement Methods 0.000 claims description 19
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- G—PHYSICS
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- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
- G21C17/112—Measuring temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
- G01D11/245—Housings for sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
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- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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Abstract
The application relates to a calibration-free temperature measurement method and a calibration-free temperature measurement device in a strong radiation environment, wherein the calibration-free temperature measurement method comprises the following steps: presetting a fiber bragg grating sensor for temperature measurement; measuring the temperature in a strong radiation test working environment and carrying out real-time feedback by transmitting an optical signal through an optical fiber; according to the real-time feedback result, reproducing temperature measurement data in a simulation environment; and demodulating and recording the temperature measurement data into an information processing system by adopting a fiber grating analyzer. Therefore, the temperature measurement data in the strong radiation environment can be traced through the method for simulating the reproduction data of the environment, the measurement system does not need to be manually calibrated, i.e. technicians do not need to enter the installation area of the measurement system for debugging and calibration, the test can be directly carried out, the test environment and the data are reproduced, and the accuracy of the temperature measurement in the strong radiation environment is obviously improved; the use reliability is high, and the device is suitable for extreme working environments such as strong radiation environment and the like, in particular to the field of nuclear power.
Description
Technical Field
The application relates to the field of nuclear power remote parameter monitoring, in particular to a calibration-free temperature measurement method and device in a strong radiation environment.
Background
Temperature measurement is required in extreme working environments such as nuclear power field and the like.
Chinese patent publication No. CN106931898A discloses "a strain measurement method based on an optical fiber sensor in a high temperature environment, and belongs to the technical field of testing. The method comprises the following steps: 1. and 2, measuring strain under a test working environment, 2, reproducing strain measurement data under a simulation environment, and 3, acquiring a strain value. The method indirectly realizes the in-situ calibration of the strain measurement, so that the strain measurement data under the high-temperature environment can be traced; the sensor is not required to be calibrated in parameters (such as sensitivity coefficient, heat output and the like) in a high-temperature environment, and can be directly used for test testing, so that errors introduced in the calibration process are avoided, the testing environment, the state of a tested piece and the sensor installation are reproduced, an implicit error source in the measuring process is offset, and the accuracy of strain measurement in the high-temperature environment can be obviously improved. The patent is an invention patent applied in 2017 by great wall measurement and test technical research institute of the company of the aerospace industry group. The invention discloses a strain measurement method based on an optical fiber sensor in a high-temperature environment, and discloses a method which can reproduce data without calibration in the high-temperature environment.
Chinese patent publication No. CN201903411U discloses "an on-line power equipment temperature monitoring system based on fiber grating temperature sensor, which includes an information processing system for performing post-processing on received data, and also includes a fiber grating temperature sensor installed on the surface of the power equipment to be measured in temperature, an output end of the fiber grating temperature sensor is connected with an on-line temperature analyzer for demodulating and analyzing signals through a transmission optical cable, and an output end of the on-line temperature analyzer is connected with the information processing system. The utility model discloses a power equipment temperature on-line monitoring system based on fiber grating temperature sensor, it uses the reliability high, sensor transmission signal can not produce drift deviation, the sensor is uncharged, safe in utilization. The patent is an online monitoring system based on a fiber grating temperature sensor, which comprises a temperature online analyzer and an information processing system and can timely feed back and process detected data.
However, CN106931898A is applied to high temperature environment, and CN201903411U is applied to power environment, and these known patent technologies cannot solve the technical problems in the nuclear power field. And CN106931898A can not feed back the measured information in real time, and CN201903411U still needs to debug, calibrate and analyze errors of the test system under the extreme working environment, and is not suitable for the technical field of nuclear power.
Disclosure of Invention
Therefore, there is a need to provide a calibration-free temperature measurement method and apparatus under strong radiation environment.
A calibration-free temperature measurement method in a strong radiation environment comprises the following steps:
presetting a fiber bragg grating sensor for temperature measurement;
measuring the temperature in a strong radiation test working environment and carrying out real-time feedback by transmitting an optical signal through an optical fiber;
according to the real-time feedback result, reproducing temperature measurement data in a simulation environment;
and demodulating and recording the temperature measurement data into an information processing system by adopting a fiber grating analyzer.
According to the calibration-free temperature measurement method, the temperature measurement data under the strong radiation environment can be traced through a method of simulating the reproduction data of the environment, an optical fiber strain sensor is not additionally adopted, the measurement system is not required to be manually calibrated, i.e. technicians are not required to enter the installation area of the measurement system for debugging and calibration, the test can be directly carried out, the test environment and the data are reproduced, and the accuracy of the temperature measurement under the strong radiation environment is obviously improved; the use reliability is high, and the device is suitable for extreme working environments such as strong radiation environment and the like, in particular to the field of nuclear power.
Further, in one embodiment, the fiber grating analyzer is used with an error correction system to demodulate and record the temperature measurement data into the information processing system.
In one embodiment, a fiber grating sensor preset for temperature measurement includes:
presetting a fiber bragg grating temperature sensor with a radiation-proof cover;
and only fixedly arranging the fiber bragg grating temperature sensor at the position to be detected.
In one embodiment, the calibration-free temperature measurement method further includes the steps of:
presetting a fiber bragg grating pressure sensor for measuring pressure;
pressure measurement is carried out in a strong radiation test working environment, and optical signals are transmitted through optical fibers for real-time feedback;
according to the real-time feedback result, reproducing pressure measurement data in a simulation environment;
and a fiber grating analyzer is adopted to demodulate and record the pressure measurement data into an information processing system.
In one embodiment, a fiber grating pressure sensor preset for pressure measurement includes:
presetting a fiber bragg grating pressure sensor with a radiation-proof cover;
and only fixedly arranging the fiber grating pressure sensor at the position of the pressure to be detected.
In one embodiment, the calibration-free temperature measurement method further includes the steps of:
presetting a fiber bragg grating liquid level sensor for liquid level measurement;
carrying out liquid level measurement in a strong radiation test working environment and carrying out real-time feedback by transmitting an optical signal through an optical fiber;
according to the real-time feedback result, reproducing the liquid level measurement data in the simulation environment;
and the liquid level measurement data is demodulated and recorded into an information processing system by adopting a fiber bragg grating analyzer.
In one embodiment, a fiber grating liquid level sensor preset for liquid level measurement comprises:
presetting a fiber bragg grating liquid level sensor with a radiation-proof cover;
and only the fiber bragg grating liquid level sensor is fixedly arranged at the position of the liquid level to be detected.
In one embodiment, the calibration-free temperature measurement method further includes the steps of:
presetting a fiber bragg grating displacement sensor for displacement measurement;
displacement measurement is carried out under a strong radiation test working environment, and optical signals are transmitted through optical fibers for real-time feedback;
according to the real-time feedback result, reproducing displacement measurement data in a simulation environment;
and demodulating and recording the displacement measurement data into an information processing system by adopting a fiber grating analyzer.
In one embodiment, a fiber grating displacement sensor preset for displacement measurement includes:
presetting a fiber bragg grating displacement sensor with a radiation-proof cover;
and only fixedly arranging the fiber bragg grating displacement sensor at the displacement position to be detected.
In one embodiment, the fiber grating analyzer is matched with the demodulation system to demodulate and record the real-time feedback result and the temperature measurement data into the information processing system.
A temperature measuring device in a strong radiation environment is realized by adopting any calibration-free temperature measuring method.
Drawings
Fig. 1 is a schematic flowchart of an embodiment of a calibration-free temperature measurement method according to the present application.
Fig. 2 is a schematic flowchart of another embodiment of a calibration-free temperature measurement method according to the present application.
Fig. 3 is a schematic application diagram of another embodiment of the calibration-free temperature measurement method according to the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used in the description of the present application are for illustrative purposes only and do not denote a single embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the present application, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In one embodiment of the present application, as shown in fig. 1, a calibration-free temperature measurement method in a strong radiation environment includes the following steps: presetting a fiber bragg grating sensor for temperature measurement; measuring the temperature in a strong radiation test working environment and carrying out real-time feedback by transmitting an optical signal through an optical fiber; according to the real-time feedback result, reproducing temperature measurement data in a simulation environment; and demodulating and recording the temperature measurement data into an information processing system by adopting a fiber grating analyzer. According to the calibration-free temperature measurement method, the temperature measurement data under the strong radiation environment can be traced through a method of simulating the reproduction data of the environment, an optical fiber strain sensor is not additionally adopted, the measurement system is not required to be manually calibrated, i.e. technicians are not required to enter the installation area of the measurement system for debugging and calibration, the test can be directly carried out, the test environment and the data are reproduced, and the accuracy of the temperature measurement under the strong radiation environment is obviously improved; the use reliability is high, and the device is suitable for extreme working environments such as strong radiation environment and the like, in particular to the field of nuclear power.
In one embodiment, a calibration-free temperature measurement method in a strong radiation environment comprises some or all of the following steps; namely, the calibration-free temperature measurement method in the strong radiation environment includes the following partial technical features or all technical features.
In one embodiment, a fiber grating sensor for temperature measurement is preset; in one embodiment, a fiber grating sensor preset for temperature measurement includes: presetting a fiber bragg grating temperature sensor with a radiation-proof cover; and only fixedly arranging the fiber bragg grating temperature sensor at the position to be detected. Namely, a calibration-free temperature measurement method in a strong radiation environment, as shown in fig. 2, includes the following steps: presetting a fiber bragg grating temperature sensor with a radiation-proof cover; only fixedly arranging the fiber bragg grating temperature sensor at the position to be detected; measuring the temperature in a strong radiation test working environment and carrying out real-time feedback by transmitting an optical signal through an optical fiber; according to the real-time feedback result, reproducing temperature measurement data in a simulation environment; and demodulating and recording the temperature measurement data into an information processing system by adopting a fiber grating analyzer. The rest of the examples are analogized. Further, in one embodiment, an industrial robot is used for fixedly arranging only the fiber grating temperature sensor at the position to be detected with temperature. By the design, manual field operation can be avoided in the whole process, and technicians do not need to enter a measuring system installation area. Further, in one embodiment, an industrial robot is used for adjusting or recovering the fiber grating temperature sensor at the position to be detected. Such design is favorable to on the one hand can avoiding fiber grating temperature sensor installation dislocation or malfunctioning to a certain extent, and on the other hand is favorable to avoiding technical staff to get into the danger area. Further, in one embodiment, the shape and/or thickness of the radiation-proof cover is set according to the radiation degree of the strong radiation environment.
In one embodiment, the temperature measurement is performed in a test working environment with strong radiation; the temperature measurement data is obtained in the step and is matched with the follow-up step to reproduce the temperature measurement data in the simulated environment, so that the temperature measurement data in the strong radiation environment can be traced, and the measurement system can be directly tested without manual calibration. Further, in one embodiment, the test operating environment is the operating environment in which the temperature measurement is required. In one embodiment, a plurality of fiber grating sensors for temperature measurement are adopted, and the temperature measurement is carried out simultaneously in a test working environment; further, in one embodiment, a plurality of fiber grating sensors for temperature measurement are adopted, and temperature measurement is carried out simultaneously and temperature measurement data is transmitted in real time in a test working environment; the preset fiber grating sensor for temperature measurement is realized before measurement, can be carried out before the equipment to be measured runs and the environment to be measured is closed, and can also be placed or adjusted by adopting an industrial robot. The whole process does not need to enter a strong radiation environment, and the strong radiation environment is widely existed in nuclear power stations, civil irradiation plants, radioactive substance storage and disposal sites, outer space and other sites. In various embodiments, the intense radiation environment is a nuclear radiation environment. The design is favorable for accurately and timely acquiring the temperature information of the working environment.
In one embodiment, temperature measurement data is reproduced in a simulated environment; further, in one embodiment, the temperature measurement data is reproduced in a simulated environment, and is synchronously measured in a test working environment with strong radiation; in one embodiment, the simulation environment is set according to a test operating environment. The design is favorable for realizing the reproduction of temperature measurement data in a simulation environment, and the test environment and the data can be reproduced, so that the temperature measurement data in a strong radiation environment can be traced, a measurement system does not need to be manually calibrated, and field personnel are protected. The method is one of the key points of the method, and realizes the calibration-free temperature measurement method based on the nuclear power field in the strong radiation environment. Due to strong radiation in the nuclear power field, the measurement system cannot be manually calibrated after being installed, the method can reproduce temperature measurement data in a simulation environment through temperature measurement in a test working environment, and then the data is demodulated and recorded into an information processing system through a fiber grating analyzer. The method for reproducing the data through the simulation environment can enable the temperature measurement data under the strong radiation environment to be traceable, does not need to manually calibrate the measurement system, can directly test and is suitable for the working environment of the nuclear electrode end.
In one embodiment, the calibration-free temperature measurement method further includes the steps of: presetting a fiber bragg grating pressure sensor for measuring pressure; pressure measurement is carried out in a strong radiation test working environment, and optical signals are transmitted through optical fibers for real-time feedback; according to the real-time feedback result, reproducing pressure measurement data in a simulation environment; and a fiber grating analyzer is adopted to demodulate and record the pressure measurement data into an information processing system. Namely, a calibration-free temperature measurement method under a strong radiation environment comprises the following steps: presetting a fiber bragg grating sensor for temperature measurement; measuring the temperature in a strong radiation test working environment and carrying out real-time feedback by transmitting an optical signal through an optical fiber; according to the real-time feedback result, reproducing temperature measurement data in a simulation environment; demodulating and inputting temperature measurement data into an information processing system by adopting a fiber grating analyzer; presetting a fiber bragg grating pressure sensor for measuring pressure; pressure measurement is carried out in a strong radiation test working environment, and optical signals are transmitted through optical fibers for real-time feedback; according to the real-time feedback result, reproducing pressure measurement data in a simulation environment; and a fiber grating analyzer is adopted to demodulate and record the pressure measurement data into an information processing system. The rest of the examples are analogized. In one embodiment, a fiber grating pressure sensor preset for pressure measurement includes: presetting a fiber bragg grating pressure sensor with a radiation-proof cover; and only fixedly arranging the fiber grating pressure sensor at the position of the pressure to be detected. The design is favorable for pressure measurement while or before or after temperature measurement, the pressure measurement can be carried out without mutual interference with the temperature measurement, the management personnel can accurately master field data of one hand, the working personnel is not required to test the working environment for manual calibration, and the pressure measurement device is particularly suitable for the working environment of the nuclear electrode end. In one embodiment, the calibration-free temperature measurement method further includes the steps of: presetting a fiber bragg grating liquid level sensor for liquid level measurement; carrying out liquid level measurement in a strong radiation test working environment and carrying out real-time feedback by transmitting an optical signal through an optical fiber; according to the real-time feedback result, reproducing the liquid level measurement data in the simulation environment; and the liquid level measurement data is demodulated and recorded into an information processing system by adopting a fiber bragg grating analyzer. In one embodiment, a fiber grating liquid level sensor preset for liquid level measurement comprises: presetting a fiber bragg grating liquid level sensor with a radiation-proof cover; and only the fiber bragg grating liquid level sensor is fixedly arranged at the position of the liquid level to be detected. The design is favorable for carrying out liquid level measurement while carrying out temperature measurement or before or after, and the liquid level measurement can be carried out with temperature measurement noninterference, is favorable for managers to accurately master field data of one hand, also does not need staff to test the working environment and carry out manual calibration, is particularly suitable for the working environment of the nuclear electrode end. In one embodiment, the calibration-free temperature measurement method further includes the steps of: presetting a fiber bragg grating displacement sensor for displacement measurement; displacement measurement is carried out under a strong radiation test working environment, and optical signals are transmitted through optical fibers for real-time feedback; according to the real-time feedback result, reproducing displacement measurement data in a simulation environment; and demodulating and recording the displacement measurement data into an information processing system by adopting a fiber grating analyzer. In one embodiment, a fiber grating displacement sensor preset for displacement measurement includes: presetting a fiber bragg grating displacement sensor with a radiation-proof cover; and only fixedly arranging the fiber bragg grating displacement sensor at the displacement position to be detected. The design is favorable for displacement measurement while or before or after temperature measurement, the displacement measurement can be carried out without mutual interference with the temperature measurement, the management personnel can accurately master field data of one hand, the working personnel is not required to test the working environment for manual calibration, and the device is particularly suitable for the working environment of the nuclear electrode end.
In one embodiment, a fiber grating analyzer is used to demodulate and record the real-time feedback results and temperature measurement data into an information processing system. Further, in one embodiment, the fiber grating analyzer is adopted to demodulate and record the temperature measurement data into the information processing system and record the simulation environment parameters, so that the temperature measurement data under the strong radiation environment can be traced, and the measurement system does not need to be manually calibrated. In one embodiment, a fiber grating analyzer is used in conjunction with a demodulation system to demodulate and record the temperature measurement data into an information processing system. Further, in one embodiment, the fiber grating analyzer is used with an error correction system to demodulate and record the temperature measurement data into the information processing system. In one embodiment, a calibration-free temperature measurement method in a strong radiation environment comprises the following steps: presetting a fiber bragg grating sensor for temperature measurement; measuring the temperature in a strong radiation test working environment and carrying out real-time feedback by transmitting an optical signal through an optical fiber; according to the real-time feedback result, reproducing temperature measurement data in a simulation environment; and demodulating and recording temperature measurement data into an information processing system by adopting a fiber grating analyzer in cooperation with an error correction system. The rest of the examples are analogized. The design is beneficial to adjusting the error of the temperature measurement data and performing additional correction before entering the system. In one embodiment, the fiber grating analyzer is matched with an error correction system to perform error correction on temperature measurement data, and then the temperature measurement data is demodulated and recorded into an information processing system. In one embodiment, the fiber grating analyzer is matched with an error correction system to perform error correction on the real-time feedback result and the temperature measurement data, and then the real-time feedback result and the temperature measurement data are demodulated and recorded into the information processing system. Further, in one embodiment, a fiber grating analyzer is used to demodulate and record various measurement data into the information processing system. Each item of measurement data includes temperature measurement data, pressure measurement data, liquid level measurement data and/or displacement measurement data and the like. The temperature measurement data can be demodulated and input into an information processing system by adopting a fiber grating analyzer; the temperature measurement data can also be demodulated and recorded into an information processing system by adopting a fiber grating analyzer in cooperation with a demodulation system and/or an error correction system. Further, in one embodiment, a fiber grating analyzer is used to receive the temperature measurement data. And demodulating the temperature measurement data by using a demodulation system, wherein the demodulation is a process of recovering a message from a modulated signal of the fiber bragg grating sensor information carried by the light. And correcting the temperature measurement data obtained by demodulation by adopting an error correction system, and then recording the temperature measurement data into an information processing system. By the design, technicians do not need to enter a measurement system installation area for debugging and calibration, the test can be directly carried out, the test environment and data can be reproduced, and the accuracy of temperature measurement in a strong radiation environment is obviously improved; the use reliability is high, and the device is suitable for extreme working environments such as strong radiation environment and the like, in particular to the field of nuclear power.
In one embodiment, as shown in fig. 3, the special radiation-proof material cover is matched with the fiber grating sensor to realize temperature measurement in a test working environment, then temperature measurement data is reproduced in a simulation environment, and then the fiber grating analyzer is adopted to demodulate and record the temperature measurement data into the information processing system. The calibration-free temperature measurement method under the strong radiation environment can be realized; the whole process does not need manual adjustment or calibration, automatic alignment and error compensation can be realized, technicians do not need to enter a measurement system installation area, the use reliability is high, direct test can be realized, the test environment and data can be reproduced, and the accuracy of temperature measurement in a strong radiation environment is obviously improved. Further, in one embodiment, the fiber grating sensor includes a fiber grating temperature sensor, a fiber grating pressure sensor, a fiber grating liquid level sensor and/or a fiber grating displacement sensor, and the radiation shield is disposed outside the fiber grating sensor; the fiber grating sensor is exposed out of the radiation-proof cover part. The radiation shield is used for shielding rays so as to avoid interference and even damage to the fiber grating sensor, and meanwhile, the fiber grating sensor is exposed for measuring environmental parameters. The shielding thickness of the radiation shielding material can be expressed in various ways, and lead equivalent, half value layer and 1/10 value layer are commonly used. From the theory of attenuation of radiation, the shielded radiation dose never becomes zero. Therefore, the shielding design of radiation does not consist in determining the thickness of a layer of a substance that completely absorbs radiation, but rather seeks to find a shielding layer thickness that reduces the radiation dose through the shielding layer by several times and meets the dose limit. The method is safe, reliable, economical and reasonable. For each embodiment of the application, the accuracy and the service life of the fiber grating sensor are not influenced. Further, in one embodiment, the radiation-proof cover is arranged around the fiber grating sensor. In one embodiment, the radiation-proof cover is provided with a straight groove, and the fiber grating sensor is positioned in the straight groove. Further, in one embodiment, the two fiber bragg grating sensors are respectively surrounded by the radiation-proof cover. In one embodiment, the radiation shield is conical; the length of the radiation-proof cover is 2-5 times of the fiber grating sensor, and the maximum diameter or the maximum thickness of the radiation-proof cover is 2-5 times of the fiber grating sensor. Or in one embodiment, the radiation-proof cover is in an ellipsoid shape or a shuttle shape, the length of the radiation-proof cover is 2 to 5 times of the fiber grating sensor, and the maximum diameter or the maximum thickness of the radiation-proof cover is 2 to 5 times of the fiber grating sensor; that is, the spoke shield has a shape with two tips and a thick middle. The design is favorable for forming a uniform shielding environment relative to the fiber bragg grating sensor, so that the radiation dose shielded in each direction is approximately the same relative to the fiber bragg grating sensor, and the dosage of the radiation shield is reduced on the premise of ensuring the shielding effect. In one embodiment, the radiation-proof cover is in an ellipsoid shape or a shuttle shape, the length of the radiation-proof cover is 3.2 to 3.6 times of the fiber grating sensor, and the maximum diameter or the maximum thickness of the radiation-proof cover is 3.2 to 3.6 times of the fiber grating sensor. The radiation-proof cover has different lengths and thicknesses according to the material selection and the structural design; but is generally not too large and if so, not only wastes material but also results in excessive weight at the fiber grating sensor. In various embodiments, the radiation shield is provided with openings to allow the fiber grating sensors to sense environmental parameters, such as temperature, etc., at the deployment location. In one embodiment, the straight slot is provided with the opening. Further, in one embodiment, the fiber grating sensor and the optical fiber connected with the fiber grating sensor are placed in the radiation shield through the opening. The design has the radiation-proof effect, can achieve the purpose of a measuring system, can replace manual work, intelligently reads data and can transmit the data in real time through the interaction of the client and the server. In various embodiments, the fiber grating sensor for temperature monitoring may be replaced by other sensors, such as a pressure sensor, a water level sensor, a displacement sensor, a strain sensor, or a combination of the above sensors, but all made of fiber grating materials. The material of the radiation shield around the fiber grating sensor can be changed into the material which can not be penetrated by other rays.
Further, in one embodiment, a clamping frame is further arranged at the arrangement position, the clamping frame is provided with a mounting frame body, at least two fixed terminals and at least two clamping pieces, and a cavity matched with the shape of the radiation shield is formed in the mounting frame body; the fixed terminal is connected with the installation frame body, the fixed terminal is used for fixing the installation frame body at the laying position, the buckling piece is connected with the installation frame body, and the buckling piece is used for fixing the radiation-proof cover in the installation frame body. In one embodiment, the mounting frame body comprises two half frame bodies which are rotatably connected, the two half frame bodies are taken out or put in the radiation shield in an opening state, the two half frame bodies form the cavity in a closing state to fix the radiation shield, and each half frame body is provided with at least one fastener which is used for fixing the two half frame bodies to each other so as to fix the radiation shield in the mounting frame body. The mounting frame body or the half frame body can be of a framework structure, namely, the outer wall of the mounting frame body has a vacancy, or can be of a shell structure, namely, the outer wall of the mounting frame body is compact; further, in one embodiment, the mounting frame body or the half frame body thereof has a shell structure, and the shell structure and the radiation-proof cover are made of the same material. In each embodiment, the mounting frame body is also provided with a corresponding opening so that the fiber grating sensor can sense the environmental parameters at the arrangement position. Such a design is advantageous for the overall formation of a detection site that avoids radiation interference. For example, the temperature of an intelligent pressure vessel of a nuclear power station can be detected in real time by utilizing the sensitivity of a fiber bragg grating sensor to the temperature, and after a safety value is set, safety early warning can be performed when a nuclear power accident happens, and monitoring parameters can be obtained in real time. The related embodiment of the application can prevent radiation, can be applied to extreme working environments such as the nuclear power field and the like, and can measure the temperature parameter of the intelligent pressure container.
In one embodiment, the temperature measurement device in the strong radiation environment is realized by adopting the calibration-free temperature measurement method in any one of the embodiments. In one embodiment, the temperature measuring device has a functional module for implementing the calibration-free temperature measuring method. In one embodiment, the temperature measuring device comprises a setting module, a measuring module, a reproduction module, a fiber grating analyzer and an information processing system; the setting module is used for presetting a fiber grating sensor for temperature measurement; the measuring module is used for measuring the temperature in a test working environment with strong radiation; the recurrence module is used for recurring temperature measurement data under a simulation environment; the fiber grating analyzer is used for demodulating and inputting temperature measurement data into the information processing system. The rest of the examples are analogized. Further, in one embodiment, the replication module includes a simulation environment structure and a replication structure; the simulation environment structure is used for simulating a measurement field of a test working environment; the retest structure is configured to replicate temperature measurement data in the simulated environmental structure. Therefore, temperature measurement data in a strong radiation environment can be traced, an optical fiber strain sensor does not need to be additionally adopted, a measurement system does not need to be manually calibrated, technicians do not need to enter a measurement system installation area for debugging and calibration, the test can be directly carried out, the test environment and the data can be reproduced, and the accuracy of temperature measurement in the strong radiation environment is obviously improved; the use reliability is high, and the device is suitable for extreme working environments such as strong radiation environment and the like, in particular to the field of nuclear power.
Other embodiments of the present application further include a calibration-free temperature measurement method and device in a strong radiation environment, which are formed by combining technical features of the above embodiments.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A calibration-free temperature measurement method in a strong radiation environment is characterized by comprising the following steps:
presetting a fiber bragg grating sensor for temperature measurement;
measuring the temperature in a strong radiation test working environment and carrying out real-time feedback by transmitting an optical signal through an optical fiber;
according to the real-time feedback result, reproducing temperature measurement data in a simulation environment;
and demodulating and recording the temperature measurement data into an information processing system by adopting a fiber grating analyzer.
2. The calibration-free temperature measurement method of claim 1, wherein presetting a fiber grating sensor for temperature measurement comprises:
presetting a fiber bragg grating temperature sensor with a radiation-proof cover;
and only fixedly arranging the fiber bragg grating temperature sensor at the position to be detected.
3. The calibration-free temperature measurement method of claim 2, further comprising the steps of:
presetting a fiber bragg grating pressure sensor for measuring pressure;
pressure measurement is carried out in a strong radiation test working environment, and optical signals are transmitted through optical fibers for real-time feedback;
according to the real-time feedback result, reproducing pressure measurement data in a simulation environment;
and a fiber grating analyzer is adopted to demodulate and record the pressure measurement data into an information processing system.
4. The calibration-free temperature measurement method of claim 3, wherein presetting a fiber grating pressure sensor for pressure measurement comprises:
presetting a fiber bragg grating pressure sensor with a radiation-proof cover;
and only fixedly arranging the fiber grating pressure sensor at the position of the pressure to be detected.
5. The calibration-free temperature measurement method of claim 2, further comprising the steps of:
presetting a fiber bragg grating liquid level sensor for liquid level measurement;
carrying out liquid level measurement in a strong radiation test working environment and carrying out real-time feedback by transmitting an optical signal through an optical fiber;
according to the real-time feedback result, reproducing the liquid level measurement data in the simulation environment;
and the liquid level measurement data is demodulated and recorded into an information processing system by adopting a fiber bragg grating analyzer.
6. The calibration-free temperature measurement method of claim 5, wherein presetting a fiber grating liquid level sensor for liquid level measurement comprises:
presetting a fiber bragg grating liquid level sensor with a radiation-proof cover;
and only the fiber bragg grating liquid level sensor is fixedly arranged at the position of the liquid level to be detected.
7. The calibration-free temperature measurement method of claim 2, further comprising the steps of:
presetting a fiber bragg grating displacement sensor for displacement measurement;
displacement measurement is carried out under a strong radiation test working environment, and optical signals are transmitted through optical fibers for real-time feedback;
according to the real-time feedback result, reproducing displacement measurement data in a simulation environment;
and demodulating and recording the displacement measurement data into an information processing system by adopting a fiber grating analyzer.
8. The calibration-free temperature measurement method of claim 7, wherein presetting a fiber grating displacement sensor for displacement measurement comprises:
presetting a fiber bragg grating displacement sensor with a radiation-proof cover;
and only fixedly arranging the fiber bragg grating displacement sensor at the displacement position to be detected.
9. The calibration-free temperature measurement method according to any one of claims 1 to 8, wherein a fiber grating analyzer is used in cooperation with a demodulation system to demodulate and record the real-time feedback result and the temperature measurement data into an information processing system.
10. A temperature measuring device under a strong radiation environment, which is implemented by the calibration-free temperature measuring method according to any one of claims 1 to 9.
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