CN103714869A - Fiber bragg grating sensing based system and method for monitoring reactor core temperature - Google Patents
Fiber bragg grating sensing based system and method for monitoring reactor core temperature Download PDFInfo
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- CN103714869A CN103714869A CN201310662093.XA CN201310662093A CN103714869A CN 103714869 A CN103714869 A CN 103714869A CN 201310662093 A CN201310662093 A CN 201310662093A CN 103714869 A CN103714869 A CN 103714869A
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- fiber
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- optical fiber
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
A fiber bragg grating sensing based system and method for monitoring reactor core temperature. The system includes a monitoring center; the monitoring center includes a light source and an optical circulator; the optical circulator is connected with the computer through a demodulation system; the optical circulator is connected with a standard communication fiber; the standard communication fiber is connected with the fiber bragg grating through a connector; and the fiber bragg grating is arranged in the core. The monitoring method is as below: the light emitted by the light source passes through the optical circulator and is transmitted into the core via the standard communication fiber; and the light reflected back by the fiber bragg grating passes through the optical circulator, and is demodulated by the demodulation system and processed by the computer, so as to calculate the change in core temperature. The invention employs the fiber bragg grating sensing to directly measure the temperature of the reactor core, can conduct distributed or multiple-point measurement, and improves the precision of core temperature measurement.
Description
Technical field
The invention belongs to fiber grating sensing technology field, relate to a kind of reactor core temperature monitoring system based on fiber-optic grating sensor, also relate to the monitoring method of this monitoring system.
Background technology
Along with the development of Nuclear Electricity, the impact that nuclear radiation produces people's productive life environment is increasing.And nuclear reactor is the heart of reactor, be contained in the middle of pressure vessel, by fuel assembly, formed.Nuclear reactor excess Temperature, causes fuel rod to melt and damaged accident occurs, and is the most serious state of affairs in the contingent accident of nuclear power station.Therefore, to core, anti-monitoring of piling core temperature is vital.
Because nuclear reactor temperature is very high, to measurement, bring very large difficulty.Traditional thermojunction type and radiant type sensor are subject to the impact of the interference of external electromagnetic field and measuring distance, coefficient of blackness, radiation coefficient, be difficult to the temperature of Measurement accuracy reactor core, and measurement point seldom.
Summary of the invention
The object of the present invention is to provide a kind of reactor core temperature monitoring system based on fiber-optic grating sensor, solve prior art and be difficult to core temperature to carry out Measurement accuracy and the few problem of measurement point.
Second object of the present invention is to provide the monitoring method of above-mentioned monitoring system.
Technical scheme of the present invention is, the reactor core temperature monitoring system based on fiber-optic grating sensor, comprises Surveillance center, and Surveillance center comprises light source and optical circulator, and optical circulator is connected with computer by demodulating system; Optical circulator is connected with standard traffic optical fiber, and standard traffic optical fiber is connected with fiber grating by connector, and fiber grating is placed in heap in-core.
The present invention also has following features:
Above-mentioned fiber grating is the grating being engraved on copper/carbon coated optical fiber.
Above-mentioned copper/carbon coated optical fiber is the additional carbon-coating of the covering of Standard single-mode fiber and copper layer.
Above-mentioned connector is FC/PC type connector.
Above-mentioned light source is wideband light source.
Above-mentioned fiber grating is high-temperature resistant optical fiber grating.
The monitoring method of the above-mentioned reactor core temperature monitoring system based on fiber-optic grating sensor, comprises Surveillance center, and Surveillance center comprises light source and optical circulator, and optical circulator is connected with computer by demodulating system; Optical circulator is connected with standard traffic optical fiber, and standard traffic optical fiber is connected with fiber grating by connector, and fiber grating is placed in heap in-core; The light that light source sends, through optical circulator, enters to pile in-core by standard traffic optical fiber transmission, and the light that fiber grating reflects passes through optical circulator again, by demodulating system demodulation, then processes through computer, calculates the variation of core temperature.
The present invention has following beneficial effect:
1, the reactor core temperature monitoring system based on fiber-optic grating sensor that the present invention proposes, multiplex mode can adopt wavelength-division multiplex, build an optical fibre optical grating sensing array, realization, to the multipoint temperature monitoring under the environment in high temperature, high pressure, high radiation, can effectively improve the measurement accuracy of core temperature.
2, monitoring method of the present invention can directly be measured reactor core temperature by optical fiber grating sensing, the sensing process of fiber grating is, by extraneous parameter, the modulation of the centre wavelength of Bragg reflection ripple is obtained to heat transfer agent, belong to a kind of wavelength-modulated type Fibre Optical Sensor, can do distributed or multimetering, improve the precision that core temperature is measured.
3, measuring method of the present invention adopts optical fiber grating sensing, is not subject to electromagnetic interference (EMI), highly sensitive, quality is light, volume is little, low-loss, radiation resistance are good, is specially adapted to extreme environment.In addition, heat transfer agent Wavelength-encoding, wavelength parameter is not subject to the fluctuation of light source power and the impact of connection or coupling loss, be easy to make continuously a plurality of gratings in an optical fiber, by in conjunction with time division multiplex and wavelength-division multiplex technique, be applicable to put into as distributed sensing element the inside of material and structure, temperature is realized to multimetering.
4, the present invention adopts high-temperature resistant optical fiber grating, can meet the working temperature of interior 600 ℃ of nuclear reactor, and have good radiation resistance.
5, measuring method of the present invention is simple, and cost is low.
Accompanying drawing explanation
Fig. 1 is the reactor core temperature monitoring system structural representation that the present invention is based on fiber-optic grating sensor.
In figure, 1. Surveillance center, 2. light source, 3. optical circulator, 4. demodulating system, 5. computer, 6. fiber grating, 7. connector, 8. standard traffic optical fiber.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated.
Referring to Fig. 1, the reactor core temperature monitoring system based on fiber-optic grating sensor, comprises Surveillance center 1, and Surveillance center 1 comprises light source 2 and optical circulator 3, and optical circulator 3 is connected with computer 5 by demodulating system 4; Optical circulator 3 is connected with standard traffic optical fiber 8, and standard traffic optical fiber 8 is connected with fiber grating 6 by connector 7, and fiber grating 6 is placed in heap in-core.
Fiber grating 6 is for being engraved in the grating of copper/carbon coated optical fiber, the additional carbon-coating of covering and copper layer that copper/carbon coated optical fiber is Standard single-mode fiber.
Connector 7 is FC/PC type connector.
Light source 2 is wideband light source.
Fiber grating 6 is high-temperature resistant optical fiber grating.
The monitoring method of the above-mentioned reactor core temperature monitoring system based on fiber-optic grating sensor, the light that light source 2 sends is through optical circulator 3, by standard traffic optical fiber 8, pass into heap in-core, the light that fiber grating 6 reflects passes through optical circulator 3 again, by demodulating system 4 demodulation, through computer 5, process, calculate the variation of core temperature.
Generally, there is the positively-modulated of refractive index in fiber core in the process of inscribing grating, and refractive index becomes large, shows as foveal reflex wavelength and to long wave direction, moves lentamente in ablation process.This class grating is common grating, and applicable surface is the widest, is called as I type fiber grating.Yet when common fiber-optic grating sensor is at high temperature worked, optical grating construction was even wiped free of in a few minutes completely at several hours, this phenomenon is called the heat fading effect of fiber grating.Therefore, they measure occasion at continuous high temperature does not have use value.
The preparation of II type fiber grating needs the laser that energy density is higher, in preparation process, exist the Nonlinear optical absorption to laser, thereby cause the melting of the glass lattice structure in optical fiber, produce larger index modulation, so II type fiber grating possesses superior high-temperature stability.Following table has been summed up the optical fiber that can be used for higher temperature:
| Fiber type | Withstand temperature (℃) | The price of every meter (＄) |
| Polyimide coated optical fiber | 300 | 0.7 |
| Aluminium coated fiber | 450 | 15 |
| Copper/carbon coated optical fiber | 600 | 15 |
| Multimode sapphire fiber | 2050 | 1520 |
The II type fiber grating of making by the method for phase mask on multimode crystalline sapphire optical fiber of femto-second laser, can under the hot environment of 1500 ℃, normally work and reflectivity without obvious decay, its temperature control raises along with the rising of temperature, and near the temperature control 1200 ℃ is 25pm/ ℃.But sapphire fiber is multimode optical fiber, and junction loss is larger, and price is more expensive, and can not do distributed measurement.Conventional coating or sheath can melt under high-temperature condition, affect the mechanical property of optical fiber, so be not suitable for the monitoring of nuclear power plant equipment.Copper/carbon applies can bear higher temperature, and copper has good radiation resistance, and the grating of making at copper/carbon coated optical fiber of point-to-point writing method, can meet 600 ℃ of following working temperatures of nuclear power plant equipment.Consider, select and on copper/carbon coated optical fiber, make grating.
The grating of inscribing on copper/carbon coated optical fiber with femto-second laser, adopts the mode of wavelength-division multiplex to be built into an optical fibre optical grating sensing array, is connected, and optical fiber optical grating array is placed in to heap in-core by FC/PC type connector with standard traffic optical fiber.As shown in Figure 1, the light that light source sends is through optical circulator, by standard traffic optical fiber transmission, enter in the fiber grating on copper/carbon coated optical fiber, if the temperature of reactor core changes, to cause the drift of the centre wavelength of the grating on copper/carbon coated optical fiber, the light that fiber grating reflects arrives monitoring temperature center through optical circulator, by demodulating system demodulation, through computer, process again, can calculate the variable quantity of temperature.
The effective refractive index n of the variation of fiber grating temperature field surrounding to fiber core
eff(pitch) Λ all has impact with the grating cycle, by fiber grating equation
λ
B＝2n
effΛ （1）
While obtaining grating variation of ambient temperature of living in, will cause reflected wavelength lambda
bdrift.
If temperature variation is Δ T, the variation of the FBG centre wavelength of answering in contrast can be provided by formula (2),
Δλ
BT＝λ
B(1+ξ)ΔT （2）
In formula, ξ is the thermo-optical coeffecient of optical fiber.
When nuclear reactor temperature variation, through demodulating system and computer, process the drift value Δ λ that can obtain bragg reflection wavelength
bT, get final product the variation of accounting temperature.
Claims (10)
1. the reactor core temperature monitoring system based on fiber-optic grating sensor, it is characterized in that: comprise Surveillance center (1), Surveillance center (1) comprises light source (2) and optical circulator (3), and optical circulator (3) is connected with computer (5) by demodulating system (4); Optical circulator (3) is connected with standard traffic optical fiber (8), and standard traffic optical fiber (8) is connected with fiber grating (6) by connector (7), and fiber grating (6) is placed in heap in-core.
2. the reactor core temperature monitoring system based on fiber-optic grating sensor as claimed in claim 1, is characterized in that: described fiber grating (6) is for being engraved in the fiber grating on copper/carbon coated optical fiber.
3. the reactor core temperature monitoring system based on fiber-optic grating sensor as claimed in claim 2, is characterized in that: the additional carbon-coating of covering and copper layer that described copper/carbon coated optical fiber is Standard single-mode fiber.
4. the reactor core temperature monitoring system based on fiber-optic grating sensor as described in claim 1-3 any one, is characterized in that: described connector (7) is FC/PC type connector.
5. the reactor core temperature monitoring system based on fiber-optic grating sensor as described in claim 1-3 any one, is characterized in that: described light source (2) is wideband light source.
6. the reactor core temperature monitoring system based on fiber-optic grating sensor as described in claim 1-3 any one, is characterized in that: described fiber grating (6) is high-temperature resistant optical fiber grating.
7. the monitoring method of the reactor core temperature monitoring system based on fiber-optic grating sensor, it is characterized in that: comprise Surveillance center (1), Surveillance center (1) comprises light source (2) and optical circulator (3), and optical circulator (3) is connected with computer (5) by demodulating system (4); Optical circulator (3) is connected with standard traffic optical fiber (8), and standard traffic optical fiber (8) is connected with fiber grating (6) by connector (7), and fiber grating (6) is placed in heap in-core; The light that light source (2) sends is through optical circulator (3), by standard traffic optical fiber (8), pass into heap in-core, the light that fiber grating (6) reflects passes through optical circulator (3) again, by demodulating system (4) demodulation, pass through again computer (5) and process, calculate the variation of core temperature.
8. the monitoring method of the reactor core temperature monitoring system based on fiber-optic grating sensor as claimed in claim 7, is characterized in that: described fiber grating (6) is for being engraved in the fiber grating on copper/carbon coated optical fiber.
9. the monitoring method of the nuclear reactor temperature monitoring system based on optical fiber grating sensing as claimed in claim 8, is characterized in that: the additional carbon-coating of covering and copper layer that described copper/carbon coated optical fiber is Standard single-mode fiber.
10. the monitoring method of the nuclear reactor temperature monitoring system based on optical fiber grating sensing as described in claim 7-9 any one, is characterized in that: described connector (7) is FC/PC type connector.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106645281A (en) * | 2017-02-21 | 2017-05-10 | 西安近代化学研究所 | Lab high-temperature aging experiment system for gel state composite fuel |
| CN107329162A (en) * | 2017-08-04 | 2017-11-07 | 上海交通大学 | Gamma radiation real-time measurement apparatus and its system based on Bragg grating |
| US20220026288A1 (en) * | 2020-07-27 | 2022-01-27 | Shanghai Huayi New Material Co., Ltd. | Reactor Temperature Measurement System, Reactor and Method for Preparing a Fiber Bragg Grating |
| CN115825113A (en) * | 2022-11-14 | 2023-03-21 | 中国核动力研究设计院 | In-reactor irradiation test parameter optical fiber online measurement system and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106645281A (en) * | 2017-02-21 | 2017-05-10 | 西安近代化学研究所 | Lab high-temperature aging experiment system for gel state composite fuel |
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| CN107329162A (en) * | 2017-08-04 | 2017-11-07 | 上海交通大学 | Gamma radiation real-time measurement apparatus and its system based on Bragg grating |
| US20220026288A1 (en) * | 2020-07-27 | 2022-01-27 | Shanghai Huayi New Material Co., Ltd. | Reactor Temperature Measurement System, Reactor and Method for Preparing a Fiber Bragg Grating |
| US11714010B2 (en) * | 2020-07-27 | 2023-08-01 | Shanghai Huayi New Material Co., Ltd. | Reactor temperature measurement system, reactor and method for preparing a Fiber Bragg Grating |
| CN115825113A (en) * | 2022-11-14 | 2023-03-21 | 中国核动力研究设计院 | In-reactor irradiation test parameter optical fiber online measurement system and method |
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Application publication date: 20140409 |