CN106979831A - Inexpensive high spatial resolution is complete with dim light grid temperature-sensitive warning system and method - Google Patents
Inexpensive high spatial resolution is complete with dim light grid temperature-sensitive warning system and method Download PDFInfo
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- CN106979831A CN106979831A CN201710122737.4A CN201710122737A CN106979831A CN 106979831 A CN106979831 A CN 106979831A CN 201710122737 A CN201710122737 A CN 201710122737A CN 106979831 A CN106979831 A CN 106979831A
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- 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
- G01K11/3206—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 at discrete locations in the fibre, e.g. using Bragg scattering
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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
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- Business, Economics & Management (AREA)
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- Fire-Detection Mechanisms (AREA)
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Abstract
It is complete with dim light grid temperature-sensitive warning system, including wideband light source, optical circulator, temperature sensing optical cable, bandstop filter, CCD Wavelength demodulations module and alarm module that the present invention provides a kind of inexpensive high spatial resolution；The light of wideband light source is transferred to temperature sensing optical cable by optical circulator, the light that temperature sensing optical cable is reflected back by bandstop filter filter out environment temperature it is normal when whole grating array reflectance spectrum, obtain the optical grating reflection spectrum of red shift, the reflection wavelength of the optical grating reflection spectrum of CCD Wavelength demodulations module demodulation red shift, alarm module is used to carry out threshold decision and alarm to the reflection wavelength of demodulation；Described temperature sensing optical cable is provided with the complete same dim light grid array inscribed using online wire drawing tower technology, and the reflectivity with each grating in dim light grid array is 0.1% 0.01% entirely, and side mode suppression ratio is more than 10 dB.If the present invention, with grating and bandstop filter, can realize the quick temperature-sensitive alarm of the high spatial resolution of low cost using complete.
Description
Technical field
The invention belongs to optical cable temperature sensing and alarm field, and in particular to a kind of inexpensive high spatial resolution is complete with weak
Grating temperature-sensitive warning system and method.
Background technology
Large tunnel, hydraulic station, oil depot, petroleum storage tank, power distribution system, warehouse, chemicals storage and production plant
And hangar etc. goes out to fire-fighting to have suitable strict requirements, it is necessary to reliable fire alarm detection system.Conventional fire alarm
System, when being using environment temperature rise, the resistance change between the wire of temperature sensing cable realizes that alarm is exported.Then
Such cable utilizes the coaxial temperature sensing cable of negative tempperature coefficient thermistor, when the temperature increases, its resistance of thermistor material
It can change, or occur short circuit.Precision can be deteriorated during however as length increase, influenced by environmental temperature, Yi Fa
Raw wrong report, therefore, of length no more than 300m of general temperature sensing cable.More than two heat-sensitive cables are around the temperature sensing cable of composition, hair
Short circuit occurs for thermo-sensitive material welding during feelings of lighting a fire, the wire of internal package, is alarmed, this kind of temperature sensing cable is in thermo-sensitive material
It must be changed after thawing.Heat-sensitive cable is with negative temperature coefficient heat-sensitive resistance material around the temperature sensing cable of composition, thermo-sensitive material thawing
Negative temperature coefficient occurs afterwards to mix with thermistor material, its characteristic is influenceed, the characteristics of there is also that must change.
Quasi-distributed optical fiber and grating sensing temperature optical cable is very sensitive to temperature, and accurate positioning, and measurement accuracy is high, solves speed governing
Degree is fast, and application is than wide.However, the making of traditional optical fiber and grating sensing temperature optical cable is sufficiently complex, first have to static
It is single under state to prepare grating, then protection is packaged to grating, then using optical fiber splicer by multiple grating welding shapes
Into array, last stranding.Want the coat of peeling optical fibre when preparing grating, and grating welding afterwards can cause fibre loss
Increase, it is impossible to be multiplexed a large amount of gratings, distance sensing is short, and the tensile strength of posetionof weld weakens significantly, optical cable less reliable,
Often there is fine situation of breaking during optical cable laying and use, limit the practical application of this optical cable, and typically all adopt
It is demodulated with wavelength-division multiplex, demodulating process is complicated and demodulation speed is slow, it is impossible to meet engineer applied.It is crucial that, big
In the application places such as type tunnel, the requirement to spatial resolution is very high, or even requires to reach 100mm spatial resolution requirements.
Therefore, the temperature sensing optical cable based on strong optical fiber optical grating array requires that spatial resolution is less than 100mm, then must use based on high spatial
Resolution ratio OFDR technologies, however, the technology demodulated complex, the cost of demodulating system is high, it is impossible to meet the application requirement at scene.
Conventional optical cable fire alarm is that, by wavelength-division multiplex technique, the number of multiplexing grating is limited to the width of light source,
Only 20 gratings of general single passage, for the temperature-sensitive limited amount of high spatial resolution；Another fire alarm method is
Based on the fire alarm system of OTDR methods, including temperature-measuring system of distributed fibers based on Raman, based on Brillouin's technology
The time-division multiplex technology for the complete same dim light grid that distributed temperature measuring system, the dynamic of Wuhan University of Technology's design are inscribed online, these
The quantity of system multiplexing is big, but spatial resolution is limited by the pulse width limitation of modulation, and its pulse width is narrower, to detection
Partial requirement is then higher, and its system cost is high, and to small size burning things which may cause a fire disaster, spatial resolution is alarmed in 100mm magnitudes tunnel fire hazard
Then it is difficult to apply.
The content of the invention
The technical problem to be solved in the present invention is：There is provided a kind of inexpensive high spatial resolution complete with the alarm of dim light grid temperature-sensitive
System and method, can realize the quick temperature-sensitive alarm of the high spatial resolution of low cost.
The present invention is that the technical scheme that solution above-mentioned technical problem is taken is：A kind of inexpensive high spatial resolution is entirely same
Dim light grid temperature-sensitive warning system, it is characterised in that：It includes wideband light source, optical circulator, temperature sensing optical cable, bandstop filter, CCD
Wavelength demodulation module and alarm module；
The light of wideband light source is transferred to temperature sensing optical cable by optical circulator, and the light that temperature sensing optical cable is reflected back passes through bandstop filter mistake
Filter environment temperature it is normal when whole grating array reflectance spectrum, obtain red shift optical grating reflection spectrum, CCD Wavelength demodulation module solutions
The reflection wavelength of the optical grating reflection spectrum of red shift is adjusted, alarm module is used to carry out threshold decision and alarm to the reflection wavelength of demodulation；
Described temperature sensing optical cable is provided with the complete same dim light grid array inscribed using online wire drawing tower technology, entirely with dim light grid array
In each grating reflectivity be 0.1% ~ 0.01%, side mode suppression ratio be more than 10 dB.
By said system, described temperature sensing optical cable length is more than 500m, and grating number is more than 5000, and grating space is
50mm~1000mm。
Using the full temperature-sensitive alarm method realized with dim light grid temperature-sensitive warning system of described inexpensive high spatial resolution,
It is characterized in that：It comprises the following steps：
S1, the light of wideband light source are transferred to temperature sensing optical cable by optical circulator, and the light that temperature sensing optical cable is reflected back passes through bandreject filtering
Device filter out environment temperature it is normal when whole grating array reflectance spectrum；Described temperature sensing optical cable, which is provided with, utilizes online wire-drawer-tower
The complete same dim light grid array that technology is inscribed, the reflectivity with each grating in dim light grid array is 0.1% ~ 0.01%, Bian Mo entirely
Rejection ratio is more than 10 dB；
S2, the temperature rise when some position, the reflectance spectrum of the grating of the position will go out in red shift from total reflection spectrum, CCD wavelength
The reflection wavelength of the optical grating reflection spectrum of demodulation module demodulation red shift；
S3, when the reflection wavelength demodulated be more than setting threshold value, then send fire alarm.
As stated above, described temperature sensing optical cable length is more than 500m, and grating number is more than 5000, and grating space is
50mm~1000mm。
Beneficial effects of the present invention are：Complete same dim light grid array of the invention by being inscribed from online wire drawing tower technology,
High spatial resolution can be accomplished, after the total reflection spectrum that intrinsic complete same dim light grid array is filtered by using bandstop filter,
The reflection wavelength of the red shift from temperature sensing optical cable is demodulated using the CCD Wavelength demodulations module of high speed, without using wavelength-division multiplex technique
All reflection wavelengths of demodulation, it is not necessary to expensive modulator and the detector of high-speed and High-speed Board Design, are substantially reduced
The cost of temperature-sensitive system, and the speed demodulated is quickly, can accomplish Real-time demodulation, the final high-space resolution for realizing low cost
The quick temperature-sensitive alarm of rate.
Brief description of the drawings
Fig. 1 is the schematic diagram of one embodiment of the invention.
The reflectance spectrum of whole grating array when Fig. 2 is normal for the environment temperature of one embodiment of the invention.
Fig. 3 is the reflectance spectrum of whole grating array when having temperature change of one embodiment of the invention.
In figure：1- wideband light sources, 2- optical circulators, 3- temperature sensing optical cables, 4- bandstop filters, 5-CCD Wavelength demodulation modules,
6- alarm modules.
Embodiment
With reference to instantiation and accompanying drawing, the invention will be further described.
The present invention provides a kind of inexpensive high spatial resolution entirely with dim light grid temperature-sensitive warning system, as shown in figure 1, it is wrapped
Include wideband light source 1, optical circulator 2, temperature sensing optical cable 3, bandstop filter 4, CCD Wavelength demodulations module 5 and alarm module 6；Broadband
The light of light source is transferred to temperature sensing optical cable by optical circulator, and the light that temperature sensing optical cable is reflected back filters out environment by bandstop filter
The reflectance spectrum of whole grating array when temperature is normal, obtains the optical grating reflection spectrum of red shift, the demodulation red shift of CCD Wavelength demodulations module
The reflection wavelength of optical grating reflection spectrum, alarm module is used to carry out threshold decision and alarm to the reflection wavelength of demodulation；Described sense
Warm optical cable is provided with the complete same dim light grid array inscribed using online wire drawing tower technology, entirely with each grating in dim light grid array
Reflectivity be 0.1% ~ 0.01%, side mode suppression ratio be more than 10 dB.Wideband light source 1 is connected with 1 port of optical circulator 2, temperature-sensitive
Optical cable 3 is connected with 2 ports of optical circulator, described bandstop filter 4 port 3 respectively with optical circulator 2 and the CCD of high speed
Wavelength demodulation module 5 is connected, and 4 pairs of complete whole reflectance spectrums with dim light grid array of bandstop filter are filtered, CCD Wavelength demodulations
The grating wavelength of red shift after the demodulation filtering of module 5, when the grating wavelength detected exceedes system thresholds, alarm module 6 sends report
It is alert.
The described length of temperature sensing optical cable 3 is more than 500m, and grating number is more than 5000, and grating space is 50mm ~ 1000mm.
Wideband light source is conventional ASE light sources, it is not necessary to modulated, therefore does not need the spy of expensive modulator and high-speed
Survey device and High-speed Board Design.
It is the complete with weak of 100mm that the dynamic online technique that the present embodiment is designed using Wuhan University of Technology, which inscribes grating space,
Grating, whole single-mode fiber no-welding-spot, in single-mode fiber drawing process, by controlling drawing speed, the temperature of fiber drawing furnace, drawing
Thread tension, the power of excimer laser, the light path for inscribing system control to touch rejection ratio with the reflectivity of dim light grid and side entirely,
The reflectivity of single grating is set to control 0.1% ~ 0.01% or so using phase masks, the uniformity of reflectivity is no more than 3dB,
The Bragg wavelength of grating is essentially identical, three dB bandwidth 0.1nm of grating or so.It is weak comprising 5000 in 500m intelligent optical cable
Grating, its reflectance spectrum 20dB width only 0.16nm.Therefore, its dim light grid has good complete same characteristic.
Bandstop filter effect is filtered entirely with the whole reflection power in weak optical fiber Bragg grating array, and bandstop filter is filtered
After the total reflection spectrum of intrinsic complete same dim light grid array, demodulated using high-speed CCD Wavelength demodulation module from optical fiber and grating sensing temperature light
The reflection wavelength of red shift in cable.When the temperature of some position is raised to a certain extent, the reflectance spectrum of the position grating will be anti-from always
Penetrate in spectrum and remove, the temperature realization of the point can just be detected by detecting that it removes the reflection wavelength of total reflection spectrum, work as temperature
More than setting threshold value when, then system will produce fire alarm.
Using the full temperature-sensitive alarm method realized with dim light grid temperature-sensitive warning system of described inexpensive high spatial resolution,
It comprises the following steps：
S1, the light of wideband light source 1 are transferred to temperature sensing optical cable 3 by optical circulator 2, and the light that temperature sensing optical cable 3 is reflected back is hindered by band
Wave filter 4 filter out environment temperature it is normal when whole grating array reflectance spectrum, as shown in Figure 2；Set on described temperature sensing optical cable 3
Favorably with the complete same dim light grid array of online wire-drawer-tower technology inscription, the reflectivity with each grating in dim light grid array is entirely
0.1% ~ 0.01%, side mode suppression ratio is more than 10 dB；
S2, the temperature rise when some position, the reflectance spectrum of obtained whole grating array is as shown in figure 3, the grating of the position
Reflectance spectrum will from total reflection spectrum in red shift go out, CCD Wavelength demodulations module 5 demodulation red shift optical grating reflection spectrum reflection wavelength；
S3, when the reflection wavelength demodulated be more than setting threshold value, then send fire alarm.
Above example is merely to illustrate the design philosophy and feature of the present invention, and its object is to make technology in the art
Personnel can understand present disclosure and implement according to this, and protection scope of the present invention is not limited to above-described embodiment.So, it is all according to
The equivalent variations made according to disclosed principle, mentality of designing or modification, within protection scope of the present invention.
Claims (4)
1. a kind of inexpensive high spatial resolution is complete with dim light grid temperature-sensitive warning system, it is characterised in that：It include wideband light source,
Optical circulator, temperature sensing optical cable, bandstop filter, CCD Wavelength demodulations module and alarm module；
The light of wideband light source is transferred to temperature sensing optical cable by optical circulator, and the light that temperature sensing optical cable is reflected back passes through bandstop filter mistake
Filter environment temperature it is normal when whole grating array reflectance spectrum, obtain red shift optical grating reflection spectrum, CCD Wavelength demodulation module solutions
The reflection wavelength of the optical grating reflection spectrum of red shift is adjusted, alarm module is used to carry out threshold decision and alarm to the reflection wavelength of demodulation；
Described temperature sensing optical cable is provided with the complete same dim light grid array inscribed using online wire drawing tower technology, entirely with dim light grid array
In each grating reflectivity be 0.1%-0.01%, side mode suppression ratio be more than 10 dB.
2. inexpensive high spatial resolution according to claim 1 is complete with dim light grid temperature-sensitive warning system, it is characterised in that：
Described temperature sensing optical cable length is more than 500m, and grating number is more than 5000, and grating space is 50mm-1000mm.
3. accused using the inexpensive high spatial resolution described in claim 1 is complete with the temperature-sensitive that dim light grid temperature-sensitive warning system is realized
Alarm method, it is characterised in that：It comprises the following steps：
S1, the light of wideband light source are transferred to temperature sensing optical cable by optical circulator, and the light that temperature sensing optical cable is reflected back passes through bandreject filtering
Device filter out environment temperature it is normal when whole grating array reflectance spectrum；Described temperature sensing optical cable, which is provided with, utilizes online wire-drawer-tower
The complete same dim light grid array that technology is inscribed, the reflectivity with each grating in dim light grid array is 0.1%-0.01%, Bian Mo entirely
Rejection ratio is more than 10 dB；
S2, the temperature rise when some position, the reflectance spectrum of the grating of the position will go out in red shift from total reflection spectrum, CCD wavelength
The reflection wavelength of the optical grating reflection spectrum of demodulation module demodulation red shift；
S3, when the reflection wavelength demodulated be more than setting threshold value, then send fire alarm.
4. temperature-sensitive alarm method according to claim 3, it is characterised in that：Described temperature sensing optical cable length is more than 500m,
Grating number is more than 5000, and grating space is 50mm-1000mm.
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| CN109253820A (en) * | 2018-10-11 | 2019-01-22 | 宜昌睿传光电技术有限公司 | A kind of water environment temperature gradient monitoring device and method based on dim light grid |
| CN109357786A (en) * | 2018-12-03 | 2019-02-19 | 湖北工业大学 | A kind of system for detecting temperature and method based on sapphire fiber grating sensor |
| CN110632720A (en) * | 2019-10-09 | 2019-12-31 | 宜昌睿传光电技术有限公司 | Ultra-weak fiber grating optical cable for water temperature monitoring |
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Effective date of registration: 20200810 Address after: 430070 Hubei Province, Wuhan city Hongshan District Luoshi Road No. 122 Co-patentee after: Wang Lixin Patentee after: Wuhan Institute of Technology Industry Group Co.,Ltd. Address before: No.122 Luoshi Road, Hongshan District, Wuhan City, Hubei Province 430070 Patentee before: WUHAN University OF TECHNOLOGY Effective date of registration: 20200810 Address after: 238300 Wuhu City, Anhui Province, Wuwei County no town nests on the east side of the road (24) Patentee after: ANHUI LONGLIAN INTELLIGENT PHOTOELECTRIC Co.,Ltd. Address before: 430070 Hubei Province, Wuhan city Hongshan District Luoshi Road No. 122 Co-patentee before: Wang Lixin Patentee before: Wuhan Institute of Technology Industry Group Co.,Ltd. |
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