CN101308598B - Fire probe system with optical fiber and grating sensing temperature - Google Patents
Fire probe system with optical fiber and grating sensing temperature Download PDFInfo
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- CN101308598B CN101308598B CN2008100354015A CN200810035401A CN101308598B CN 101308598 B CN101308598 B CN 101308598B CN 2008100354015 A CN2008100354015 A CN 2008100354015A CN 200810035401 A CN200810035401 A CN 200810035401A CN 101308598 B CN101308598 B CN 101308598B
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- optical fiber
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- fiber coupler
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Abstract
The invention relates to fiber grating temperature sensing fire detection system, comprising a light source module, a wavelength etalon, an optical fiber coupler, a photo-detector, a main control module, a signal output module and a temperature sensor; the light source module and the wavelength etalon are respectively connected with the optical fiber coupler; the wavelength etalon and the signal output module are respectively connected with the main control module; the temperature sensor is connected with the optical fiber coupler; the optical fiber coupler is connected with the photo-detector; the photo-detector and the optical fiber coupler are combined to be connected with the main control module. Compared with prior art, the system has the advantages of high measurement precision, good long-term stability of performances, distributed measurement and high sampling frequency.
Description
Technical field
The present invention relates to fire detecting system, particularly fire probe system with optical fiber and grating sensing temperature.
Background technology
Fire probe system with optical fiber and grating sensing temperature is based on the novel fire detecting system of optical fiber and grating sensing temperature technology, have highly sensitive, the performance long-time stability are good, distributed characteristics such as install and measure, because the characteristic that its full optical fiber passive is measured, be particularly suitable for inflammable, use under the rugged surroundings such as explosive and forceful electric power magnetic.
Fiber-optic grating sensor is a kind of novel optical fiber sensor made from fiber grating, it is the full fiber optic passive device that grows up the nineties in 20th century, utilize fiber grating to can be made into multiple sensors, as sensors such as temperature, strain, stress, acceleration, pressure.Different fiber-optic grating sensors can have different operation wavelengths, therefore can utilize wavelength-division multiplex technique, makes distributed measurement at a plurality of fiber-optic grating sensors of optical fiber cascade, has strengthened the dirigibility of wiring.Fibre Optical Sensor have volume little, in light weight, with the optical fiber compatibility, insert characteristics such as loss is low, the performance long-time stability are good.
Fibre optic temperature sensor is a branch with fastest developing speed in the Fibre Optical Sensor, has replaced traditional temperature sensor, as resistance strain gage.Compare with traditional resistance strain gage, it is little, in light weight that Fibre Optical Sensor has a volume, is not subjected to electromagnetic interference (EMI), radioresistance, and conspicuous advantage such as distributed measurement is so obtained using widely in the temperature survey field.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of stable fire probe system with optical fiber and grating sensing temperature flexibly for the defective that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions: fire probe system with optical fiber and grating sensing temperature, it is characterized in that, comprise light source module, the standard of wavelength tool, fiber coupler, photo-detector, main control module, signal output module, temperature sensor, described light source module, the standard of wavelength tool is connected with fiber coupler respectively, described standard of wavelength tool, signal output module is connected with main control module respectively, described temperature sensor is connected with fiber coupler, described fiber coupler is connected with photo-detector, described photo-detector, the fiber coupler composite module is connected with main control module.
Described light source module adopts high-power wideband A SE light source, has improved sensor temperature monitoring accuracy and sensitivity greatly.
Described standard of wavelength tool makes that the detection of center sensor wavelength is accurate more and rapid, has improved the accuracy that wavelength detects.
Described main control module adopts industrial computer that data are processed and displayed, and the high capacity fast data processing capability of industrial computer has shortened the response time of native system, makes the sensor wavelength demodulation very accurately with rapid.
Described array of temperature sensor adopts wavelength-division multiplex technique, and a plurality of temperature sensors of reusable on one road optical fiber make system have the characteristics of distributed data acquisition, improves system's installation flexibility, is particularly suitable for the multiple spot fire hazard monitoring.
Compared with prior art, the present invention has the measuring accuracy height, and the performance long-time stability are good, distributed measurement, the characteristics that sample frequency is high.
Description of drawings
Fig. 1 is the structural representation of fire probe system with optical fiber and grating sensing temperature of the present invention;
Fig. 2 is the temperature-measurement principle figure of fire probe system with optical fiber and grating sensing temperature of the present invention;
Fig. 3 is that the sensor wavelength of fire probe system with optical fiber and grating sensing temperature of the present invention is with the variation of temperature synoptic diagram;
Fig. 4 is the wavelength interval synoptic diagram of fire probe system with optical fiber and grating sensing temperature of the present invention.
Embodiment
The temperature-measurement principle of Fibre Optical Sensor
Fiber grating is exactly one section optical fiber, has the structure of refractive index cycle variation in its fibre core.According to mode coupling theory, λ
BThe wavelength of=2n Λ is just reflected back (wherein λ B is the centre wavelength of fiber grating, and Λ is the grating cycle, and n is the effective refractive index of fibre core) by fiber grating.
As shown in Figure 2, the centre wavelength signal λ of reflection
B, with the grating periods lambda, the effective refractive index n of fibre core is relevant, so all can cause the variation of the centre wavelength that reflects when extraneous measured optical fiber grating temperature, the stress changes of causing.The variation that is to say fiber grating reflected light centre wavelength has reflected the situation of change of extraneous measured signal.The pass of the centre wavelength of fiber grating and temperature and strain is:
Wherein,
Be the thermal expansivity of optical fiber,
Be the thermo-optical coeffecient of fiber optic materials,
Elasto-optical coefficient for fiber optic materials.At the 1550nm window, the temperature coefficient of centre wavelength is about 10.3pm/ ℃, and the coefficient of strain is 1.209pm/ μ ε.If fibre-optic sensor package in the temperature sensitizing material, can be improved its temperature coefficient sensitivity, and then obtain bigger measuring accuracy.
Sensor wavelength is with variation of temperature
What sensor wavelength referred to is exactly the centre wavelength of spike in the sensor reflectance spectrum.These peak wavelengths change along with the change of strain and temperature.When temperature rising or strain increase, the peak wavelength of sensor is elongated.As shown in Figure 3, if sensor is heated to 60 ℃ from 20 ℃, the peak wavelength of sensor will increase (every ℃ changes about 10pm).Most of wavelength inquiry systems are operated in the 50nm window scope, from 1520nm to 1570nm.
Sensor wavelength at interval
Sensor wavelength is exactly centre wavelength poor of two sensors at interval.Sensor array has comprised a large amount of sensing gratings, therefore must guarantee " addressing " each grating, promptly confirms each grating according to the centre wavelength of independent variation.For this reason, require the central wavelength lambda of each grating in each passage
1, λ
2... λ
nAnd working range Δ λ
1, Δ λ
2... Δ λ
n, do not overlap mutually, as shown in Figure 4.So wherein have two aspects to need to consider: the investigative range Δ λ of the buffer zone between the sensing grating (buffer) and each sensing grating.And investigative range Δ λ is determined by measurement range, and measurement range is big more, and investigative range is just big more.For example if measurement range is ± 3000 μ ε, investigative range is 6nm just.Each sensor all needs to have the space of enough wave length shifts to catch desired strain and variation of temperature scope.
The sensor parameters index
| Project | Parameter |
| The standard range | -60℃～+300℃ |
| Measuring accuracy | ±2℃ |
| Resolution | 0.1℃ |
| Apparent size | 75mm×￠6mm |
| Mounting means | Surface or direct-burried |
| Wavelength coverage | 1525nm～1565nm |
| Reflectivity | ≥90％ |
| The tail optical fiber kind | Metal armouring |
| Connected mode | FC/PC or welding |
| Serviceability temperature | -60℃～299℃ |
| Storage temperature | -60℃～299℃ |
Fire probe system with optical fiber and grating sensing temperature has adopted spectrum detection technique advanced in the world, and system both provided high-precision wavelength resolution, satisfies the requirement of industrial environment long-time running stability again.System adopts wavelength-division multiplex (WDM) demodulation techniques to come demodulation fibre optic temperature sensor array, and main control unit adopts industrial computer to carry out data processing, and the Large Volume Data treatment facility of this high speed can the required mass data of fast processing spectral analysis.The basic function module that system comprises comprises as shown in Figure 1: temperature sensor, light source module, standard of wavelength tool, fiber coupler, photo-detector, main control module, signal output module.
Array of temperature sensor adopts wavelength-division multiplex technique, and a plurality of temperature sensors of reusable on one road optical fiber make system have the characteristics of distributed data acquisition, improves system's installation flexibility, is particularly suitable for the multiple spot fire hazard monitoring.
Light source module adopts high-power wideband A SE light source, has improved sensor temperature monitoring accuracy and sensitivity greatly.
The standard of wavelength tool makes that the detection of center sensor wavelength is accurate more and rapid, has improved the accuracy that wavelength detects.
Main control module adopts current state-of-the-art industrial computer that data are processed and displayed, and the high capacity fast data processing capability of industrial computer has shortened the response time of native system, makes the sensor wavelength demodulation very accurately with rapid.
The software of main control module calculates the variation of environment temperature according to the center wavelength variation of sensor, simultaneously according to user's setting, can in time send high temperature alarm and differential temperature and report to the police.
Optical index:
Port number 1 can be expanded
Every passage maximum sensor quantity 80
Wavelength coverage 1525～1565nm
Absolute precision ± 5pm
Dynamic range＞50dB
Resolution 1pm
Sweep frequency 1Hz or user are free
Typical wavelengths is 0.5nm at interval
Optic splice FC/PC or FC/APC
The opering characteristic of electric apparatus:
Power supply 220VAC
Mechanical property:
Size 510 * 440 * 180mm
0～40 ℃ of working temperature
Fire probe system with optical fiber and grating sensing temperature has the certainty of measurement height, and the performance long-time stability are good, distributed measurement, and the sample frequency high can adapt to numerous temperature sensing demands, is mainly used in following aspect: 1, residential quarters detection; 2, commercial building temperature monitoring; 3, stock tank temperature monitoring; 4, explosion-proof place temperature monitoring; 5, civil construction project monitoring; 6, oil well Temperature Distribution.
Claims (5)
1. fire probe system with optical fiber and grating sensing temperature, it is characterized in that, comprise light source module, standard of wavelength tool, fiber coupler, photo-detector, main control module, signal output module, temperature sensor, described light source module, standard of wavelength tool are connected with fiber coupler respectively, described standard of wavelength tool, signal output module are connected with main control module respectively, described temperature sensor is connected with fiber coupler, described fiber coupler is connected with photo-detector, and described photo-detector, fiber coupler composite module are connected with main control module.
2. fire probe system with optical fiber and grating sensing temperature according to claim 1 is characterized in that, described light source module adopts high-power wideband A SE light source, has improved sensor temperature monitoring accuracy and sensitivity greatly.
3. fire probe system with optical fiber and grating sensing temperature according to claim 1 is characterized in that, described standard of wavelength tool makes that the detection of center sensor wavelength is accurate more and rapid, has improved the accuracy that wavelength detects.
4. fire probe system with optical fiber and grating sensing temperature according to claim 1, it is characterized in that, described main control module adopts industrial computer that data are processed and displayed, the high capacity fast data processing capability of industrial computer has shortened the response time of native system, makes the sensor wavelength demodulation very accurately with rapid.
5. fire probe system with optical fiber and grating sensing temperature according to claim 1, it is characterized in that, described array of temperature sensor adopts wavelength-division multiplex technique, the a plurality of temperature sensors of reusable on one road optical fiber, make system have the characteristics of distributed data acquisition, raising system installation flexibility is particularly suitable for the multiple spot fire hazard monitoring.
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| CN2008100354015A CN101308598B (en) | 2008-03-31 | 2008-03-31 | Fire probe system with optical fiber and grating sensing temperature |
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|---|---|---|---|
| CN2008100354015A CN101308598B (en) | 2008-03-31 | 2008-03-31 | Fire probe system with optical fiber and grating sensing temperature |
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| CN101308598B true CN101308598B (en) | 2010-06-02 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101571983B (en) * | 2009-04-30 | 2011-12-07 | 曹春耕 | Method for alarming and positioning fire disaster automatically in fiber gating tunnel |
| CN102650629B (en) * | 2011-03-24 | 2015-09-16 | 北京交科公路勘察设计研究院有限公司 | A kind of device implemented based on the water seepage of tunnel monitoring method of fiber grating |
| CN102494798B (en) * | 2011-11-15 | 2014-11-26 | 清华大学 | Optical fiber temperature sensor used for measuring multipoint temperature in real time |
| CN102928001A (en) * | 2012-10-17 | 2013-02-13 | 中南林业科技大学 | Forest fire monitoring wireless sensing system based on fiber bragg grating sensing technology |
| CN103213545B (en) * | 2012-11-12 | 2016-04-20 | 海宁伊满阁太阳能科技有限公司 | Expose to the sun with the sun and penetrate the vehicle of estimator optical fiber temperature-measurement fire early-warning system |
| CN105469527A (en) * | 2016-01-13 | 2016-04-06 | 上海腾盛智能交通技术有限公司 | Multisensor-based fire temperature measurement system |
| EP3539108B1 (en) | 2016-11-11 | 2020-08-12 | Carrier Corporation | High sensitivity fiber optic based detection |
| CA3043583A1 (en) | 2016-11-11 | 2018-05-17 | Carrier Corporation | High sensitivity fiber optic based detection |
| WO2018089654A1 (en) | 2016-11-11 | 2018-05-17 | Carrier Corporation | High sensitivity fiber optic based detection |
| EP3539105A1 (en) | 2016-11-11 | 2019-09-18 | Carrier Corporation | High sensitivity fiber optic based detection |
| CN108205287A (en) * | 2016-12-20 | 2018-06-26 | 天津市军联科技有限公司 | Oil depot monitoring system based on DCS |
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