CN106781193A - Parting grating array optical fiber linear temperature-sensing fire detecting system and method during subregion - Google Patents
Parting grating array optical fiber linear temperature-sensing fire detecting system and method during subregion Download PDFInfo
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- CN106781193A CN106781193A CN201710117563.2A CN201710117563A CN106781193A CN 106781193 A CN106781193 A CN 106781193A CN 201710117563 A CN201710117563 A CN 201710117563A CN 106781193 A CN106781193 A CN 106781193A
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- temperature
- fire
- grating
- optical fiber
- grating array
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- 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
Abstract
The invention discloses parting grating array optical fiber linear temperature-sensing fire detecting system and method during a kind of subregion, wherein system includes grating array temperature sensing optical fiber, Wave time division demodulation module, fire alarm module and temperature display module；Grating array temperature sensing optical fiber is distributed in different fire compartments, and multiple grating temperature sensors are distributed on grating array temperature sensing optical fiber, and reflectance spectrum is identical at the same temperature for all grating temperature sensors in same fire compartment；The light pulse that Wave time division demodulation module sends enters grating array temperature sensing optical fiber, each grating temperature sensor in grating array temperature sensing optical fiber has reflectance spectrum close echo timesharing point demodulation module, the time of the reflectance spectrum close echo timesharing of different fire compartments point demodulation module is different, Wave time division demodulation module calculates the temperature of different fire compartments according to reflectance spectrum, and export temperature signal to temperature display module, while exporting fire alarm signal according to alarm strategy gives fire alarm module.
Description
Technical field
The present invention relates to temperature-sensing fire detecting field, more particularly to parting line type sense during subregion based on grating array optical fiber
Warm fire detecting system and method.
Background technology
The application scenario of linear temperature-sensing fire detecting is a lot, and the detection of cable is wherein important one, its fire
Calamity feature proposes new requirement to fire detection technology.It is related in industrial enterprise for aspects such as distribution, control, signal, power
Cable spread all over Quan Chang, especially in cable tunnel (corridor) road, cable interlayer, electric basement, cable duct and workshop inner cable crane span structure
It is very high Deng building or region inner cable dense degree, the features such as fire has fast-growth, difficulty of putting out a fire to save life and property, these cables in addition
Often run through full factory, fire is easy to spread, and harmfulness is very big.Summarize the occurrence cause of cable fire, cable short circuit, cable mistake
The small-scale fire that heat, cutting spark and slag cause accounts for the 90% of cable fire case.The characteristics of these small-scale fire
It is that thermal source size is small, flames of anger radiation is small and is distributed over long distances along cable,《Iron and steel metallurgy enterprise designs fire safety rules》
GB50414 is made that the definition of correlation, i.e. burning things which may cause a fire disaster size are no more than 10cm to this small-scale fire.These features are to cable fire
Detection Techniques proposition, the requirement of high-space resolution, detection range long and fast-response speed.
Existing linear temperature-sensing fire detecting technology mainly has：Temperature sensing cable, fibre scattering temperature-sensitive technology and traditional fiber light
Grid temperature-sensitive technology.(1) temperature sensing cable (Li G, Zhang W.Analog Line-Type Fixed Temperature Fire
Detection Cable:US, US20080106365 [P] .2008.) utilize the thermally sensitive feature measurement of material resistance value
Temperature, certainty of measurement is not high, can be used for detection, and generally the limit of detection length is at 100-200 meters, it is difficult on a large scale should
With, and cannot be used for high-tension cable.(2) fibre scattering temperature-sensitive technology (Bowen J M, Sullivan P J, Blanche S M,
et al.Optical-fiber raman spectroscopy used for remote in-situ environmental
analysis:US, US4802761 [P] .1989.) the thermally sensitive feature measurement temperature of fiber optic materials scattering strength is utilized,
Detection length will be measured this in kilometer rank, but because scattered light intensity is million-thousand a ten thousandths of incident intensity
The change of weak intensity light is just more difficult, causes response speed slow, and spatial resolution is low, it is difficult to meet the application need of fire alarm
Ask.(3) optical fiber and grating sensing temperature technology varies with temperature thermometric using grating Bragg reflection wavelength, and system response time is fast, surveys
Warm high precision, has realized that (Ding Hongjun, Fan Dian, Yao Haowei wait to be based on line type temperature-sensitive fire for distance sensing 20-30 kilometers of detection
Cable tunnel fire test [J] optical precision engineerings of fire detector, 2013,21 (9):2225-2230.).But sensing
Fiber-optic grating sensor needs single-point to prepare, and causes its spatial resolution to be restricted, and power system capacity is also limited.
The content of the invention
It is an object of the invention to realize parting grating when spatial discrimination high, detection range long and fast response time subregion
Array fibre linear temperature-sensing fire detecting system.
To achieve the above object, parting grating array optical fiber linear temperature-sensing fire detecting system when the present invention provides a kind of subregion
System.
The system includes grating array temperature sensing optical fiber, Wave time division demodulation module, fire alarm module and temperature display mould
Block；
The grating array temperature sensing optical fiber is distributed in different fire compartments, is distributed on the grating array temperature sensing optical fiber many
Individual grating temperature sensor, all grating temperature sensors in same fire compartment reflectance spectrum phase at the same temperature
Together；
The light pulse that the Wave time division demodulation module sends enters grating array temperature sensing optical fiber, grating array temperature sensing optical fiber
In each grating temperature sensor have reflectance spectrum close echo timesharing point demodulation module, the reflectance spectrum of different fire compartments
The time for returning to the Wave time division demodulation module is different, and the Wave time division demodulation module calculates different preventing according to reflectance spectrum
The temperature of fiery subregion, and temperature signal is exported to temperature display module, while according to alarm strategy output fire alarm signal
Give fire alarm module.
Above-mentioned technical proposal is connect, the grating array temperature sensing optical fiber length is at least 1 kilometer, be distributed at least 200 not
In same fire compartment, at least 50 grating temperature sensors are distributed in each fire compartment.
Visited present invention also offers parting grating array optical fiber line-type heat during a kind of subregion based on said system
Survey method, the method is comprised the following steps：
Thermometric is carried out using each fire compartment as an entirety, temperature is consistent in same fire compartment；
When there is not fire, the reflectance spectrum of all grating temperature sensors is consistent, owns in same fire compartment
As shown in grating spectrum Fig. 1 in Fig. 2, Wave time division demodulation module does not start fire alarm module to the spectrogram of optical grating reflection, only
Export the temperature signal of each fire compartment to temperature display module；
When there is fire, occurs the grating temperature sensor reflection of fire compartment where focus, focus in fire compartment
Spectrum change, original reflectance spectrum region is removed by the spectrum of the focus, and now all grating reflection spectral figures are such as in the fire compartment
In Fig. 2 shown in grating spectrum Fig. 2, when hotspot range further expands so that when multiple gratings are heated, the spectral intensity of removal is entered
One step increases, and now all grating reflection spectral figures as shown in grating spectrum Fig. 3 in Fig. 2, work as hotspot range in the fire compartment
When covering whole fire compartment, all grating spectrums remove original reflectance spectrum area in the subregion, now in the fire compartment
All grating reflection spectral figures are as shown in the total grating spectrum Fig. 4 of Fig. 2；
Wave time division demodulation module starts fire alarm module according to alarm strategy, and exports the focus temperature of each fire compartment
Spend temperature display module.
The beneficial effect comprise that：Grating array temperature sensing optical fiber is distributed in different fire compartments by the present invention,
Multiple grating temperature sensors are distributed on each grating array temperature sensing optical fiber, thermometric are carried out using each subregion as an entirety,
Demodulation difficulty is reduced, the purpose of quick response is reached.When a fire, light spectral shift after any grating in fire compartment is heated
Go out to be superimposed spectrum, it is to avoid occur thousands of grating secondary lobes add up flood be heated remove spectrum problem.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
The structural representation of parting grating array optical fiber linear temperature-sensing fire detecting system when Fig. 1 is embodiment of the present invention subregion
Figure.
Fig. 2 is the single partition spectral signal figure of the embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the present invention, not
For limiting the present invention.
As shown in figure 1, parting grating array optical fiber linear temperature-sensing fire detecting system includes during embodiment of the present invention subregion
Grating array temperature sensing optical fiber, Wave time division demodulation module 4, fire alarm module 5 and temperature display module 6.
Grating array temperature sensing optical fiber is distributed in different fire compartments, and multiple light are distributed on the grating array temperature sensing optical fiber
Grid temperature sensor, reflectance spectrum is identical at the same temperature for all grating temperature sensors in same fire compartment.
As shown in figure 1, specifically including fire compartment 1, fire compartment 2, the size of fire compartment 3 ... fire compartment m, m
Determined according to monitoring of environmental.
Fire compartment 1 includes that 1 grating temperature sensor of 1.1- fire compartments 1, the grating temperature of 1.2- fire compartments 1 are passed
Sensor 2,1 grating temperature sensor of 1.3- fire compartments 3 ... 1.n- fire compartments, 1 grating temperature sensor n；
Fire compartment 2 includes that 2 grating temperature sensor of 2.1- fire compartments 1, the grating temperature of 2.2- fire compartments 2 are passed
Sensor 2,2 grating temperature sensor of 2.3- fire compartments 3 ... 2.n- fire compartments, 2 grating temperature sensor n；
Fire compartment 3 includes that 3 grating temperature sensor of 3.1- fire compartments 1, the grating temperature of 3.2- fire compartments 3 are passed
Sensor 2,3 grating temperature sensor of 3.3- fire compartments 3 ... 3.n- fire compartments, 3 grating temperature sensor n；
M.1- fire compartment m grating temperature sensors 1, m.2- fire compartment m grating temperature sensors in fire compartment m
No. 2, m.3- fire compartment m grating temperature sensors 3 ... m.n- fire compartment m grating temperature sensors n.
Wave time division demodulation module 4 is connected with one end of grating array temperature sensing optical fiber, what Wave time division demodulation module 4 sent
Light pulse enters grating array temperature sensing optical fiber, and each grating temperature sensor in grating array temperature sensing optical fiber has reflectance spectrum
Close echo timesharing point demodulation module 4, the time of the reflectance spectrum return Wave time division demodulation module 4 of different fire compartments is not
Together, Wave time division demodulation module 4 calculates the temperature of different fire compartments according to reflectance spectrum, and temperature signal is exported to temperature
Display module 6, while exporting fire alarm signal to fire alarm module 5 according to alarm strategy, alarm strategy is main according to tool
The temperature difference, constant temperature of body or both combine to specify, when the threshold value for reaching certain just exports fire alarm signal.
In one embodiment of the present of invention, intensive grating array temperature sensing optical fiber length is 1 kilometer, is distributed in 200 differences
Fire compartment in, the fire compartment be 5 meters, 50 grating temperature sensors, the light are distributed in each fire compartment
Grid temperature sensor spacing is 10cm.
Using the online technology of preparing of grating array, grating array temperature sensing optical fiber is prepared, for cable fire small size burning things which may cause a fire disaster
Demand, realize the measurement of high spatial resolution temperature.The online technology of preparing of grating array has the characteristics that：Drawn using industry
Silk tower technology of preparing, can rapid, high volume prepare grating；Damaged without welding, contactless between continuous multiple spot write-in sensing grating, grating
Consumption, high mechanical strength；Production room between sensing grating from Centimeter Level to meter level away from can arbitrarily set；Fast response time, visits
Find range away from.
But this intensive grating array is used for cable fire, and detection there is problems：1st, with the sky of sensing grating
Between closeness increase, grating quantity increase, demand demodulation information content increase, system response time decline；2nd, a large amount of co-wavelengths
The secondary lobe of grating is cumulative serious, floods useful signal.
Parting grating array optical fiber linear temperature-sensing fire detecting method during subregion, temperature is consistent in same fire compartment,
When there is not fire, the reflectance spectrum of all grating temperature sensors is consistent.
Fig. 2 is the single partition spectral signal figure of the embodiment of the present invention, and the figure is institute in the next fire compartment of several situations
There is the reflectance spectrum figure of grating, wherein grating spectrum 1 is all optical grating reflections when not having focus to act in the fire compartment
Spectrum, grating spectrum 2 is have focus to act on all grating reflection spectrals during fiber grating, grating spectrum 3 in the fire compartment
For when hotspot range further expands in the fire compartment, the reflectance spectrum of all gratings, grating spectrum 4 is that the fire compartment is complete
The reflectance spectrum of all gratings when portion is covered by focus.
The asterisk of grating spectrum Fig. 1 marks curve in the spectrogram such as Fig. 2 of all optical grating reflections in same fire compartment
Shown, Wave time division demodulation module 4 does not start fire alarm module, and the temperature signal for only exporting each fire compartment shows to temperature
, when there is fire, there is focus in module in fire compartment, the grating temperature sensor reflectance spectrum of focus region changes,
Original reflectance spectrum region is removed, now grating spectrum Fig. 2 circle marks in all grating reflection spectral figures such as Fig. 2 in the fire compartment
Shown in note curve, when hotspot range further expands so that when multiple gratings are heated, the spectral intensity of removal further increases,
Now in the fire compartment all grating reflection spectral figures as in Fig. 2 grating spectrum Fig. 3 round dots mark curve shown in, when focus model
When enclosing covering whole fire compartment, all grating spectrums remove original reflectance spectrum area, the now fire compartment in the subregion
Interior all grating reflection spectral figures are as shown in the total grating spectrum Fig. 4 cross mark curves of Fig. 2.I.e. hot spot region influences a grating
During temperature sensor, spectrum is marked shown in curve such as Fig. 2 circles, when hot spot region influences two grating temperature sensors, spectrum
As shown in Fig. 2 round dots mark curve, when hot spot region influences the grating temperature sensor of whole subregion, spectrum such as Fig. 2 cross mark
Shown in note curve, above-mentioned situation Wave time division demodulation module 4 starts fire alarm module 5 according to alarm strategy, and exports each anti-
The hot(test)-spot temperature of fiery subregion is to temperature display module 6.Each subregion carries out thermometric, a multi-subarea extracting one as an entirety
Spectrum, the time that different subregions reflectance spectrum is returned is different, program reduction demodulation difficulty, reaches the purpose of quick response, together
When can reach 10cm small size detections.50 grating reflection spectrals in fire compartment add up, any grating be heated after light
Spectral shift goes out to be superimposed spectrum, it is to avoid occur thousands of grating secondary lobes add up flood be heated remove spectrum problem.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (3)
1. parting grating array optical fiber linear temperature-sensing fire detecting system during a kind of subregion, it is characterised in that including grating array
Temperature sensing optical fiber, Wave time division demodulation module, fire alarm module and temperature display module；
The grating array temperature sensing optical fiber is distributed in different fire compartments, and multiple light are distributed on the grating array temperature sensing optical fiber
Grid temperature sensor, reflectance spectrum is identical at the same temperature for all grating temperature sensors in same fire compartment；
The light pulse that the Wave time division demodulation module sends enters grating array temperature sensing optical fiber, in grating array temperature sensing optical fiber
The reflectance spectrum that each grating temperature sensor has reflectance spectrum close echo timesharing point demodulation module, different fire compartments is returned
The time of the Wave time division demodulation module is different, and the Wave time division demodulation module calculates different fire prevention point according to reflectance spectrum
The temperature in area, and temperature signal is exported to temperature display module, while exporting fire alarm signal to fire according to alarm strategy
Calamity alarm module.
2. system according to claim 1, it is characterised in that the grating array temperature sensing optical fiber length is at least 1 kilometer,
It is distributed at least 200 different fire compartments, at least 50 grating temperature sensors is distributed in each fire compartment.
3. a kind of parting grating array optical fiber linear temperature-sensing fire detecting method during subregion based on claim 1, its feature exists
In the method is comprised the following steps：
Thermometric is carried out using each fire compartment as an entirety, temperature is consistent in same fire compartment；
When there is not fire, the reflectance spectrum of all grating temperature sensors is consistent, and Wave time division demodulation module does not start fire
Calamity alarm module, only exports the temperature signal of each fire compartment to temperature display module；
When there is fire, the grating temperature sensor reflectance spectrum for occurring fire compartment where focus, focus in fire compartment becomes
Change, the spectrum of the focus is removed into original reflectance spectrum region；
Wave time division demodulation module starts fire alarm module according to alarm strategy, and exports the hot(test)-spot temperature of each fire compartment and arrive
Temperature display module.
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Cited By (3)
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| CN109308784A (en) * | 2017-07-27 | 2019-02-05 | 上海电巴新能源科技有限公司 | Charging rack, charging abnormality judgment method, electrical changing station and energy storage station |
| WO2021228273A1 (en) * | 2020-05-09 | 2021-11-18 | 武汉理工大学 | Optical fiber grating sensing method applied to small-size fire source monitoring |
| EP4113470A1 (en) * | 2021-06-30 | 2023-01-04 | Airbus Operations GmbH | Fire detection system for an aircraft compartment |
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| EP4113470A1 (en) * | 2021-06-30 | 2023-01-04 | Airbus Operations GmbH | Fire detection system for an aircraft compartment |
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Application publication date: 20170531 |