CN201266418Y - On-line real time fibre-optical grating fire monitoring system - Google Patents
On-line real time fibre-optical grating fire monitoring system Download PDFInfo
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- CN201266418Y CN201266418Y CNU200820122224XU CN200820122224U CN201266418Y CN 201266418 Y CN201266418 Y CN 201266418Y CN U200820122224X U CNU200820122224X U CN U200820122224XU CN 200820122224 U CN200820122224 U CN 200820122224U CN 201266418 Y CN201266418 Y CN 201266418Y
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Abstract
The utility model discloses an on-line real-time optical fiber grating fire monitoring system which is produced by being based on the coarse wavelength division multiplexing demodulation technology, the optical time-domain analysis technology and the optical fiber grating temperature measurement principle. The on-line real-time optical fiber grating fire monitoring system comprises an optical fiber circulator, wherein, the input port of the optical fiber circulator is connected with a laser diode with a pigtail, the output port of the optical fiber circulator is sequentially connected with an optical fiber coarse wavelength division multiplexing demodulator, a photoelectric detector and a digital signal processor, the other port of the optical fiber circulator is connected with one end of a temperature-sensing optical cable, n optical fiber grating temperature-sensing fire detectors with the same wavelength are connected on the temperature-sensing optical cable, the signal output port of the digital signal processor is connected with a display or an alarm, and n is a positive integer. The fire monitoring system has the advantages of low cost, high resolution and fast demodulation speed, and the performance-price ratio thereof is better than the existing disaster prevention temperature-sensing optical cable and other temperature-sensing optical cables.
Description
Technical field
The utility model relates to fire hazard monitoring system, especially the online in real time optical fiber grating fire monitoring system.
Background technology
For a long time, mainly use linear temperature sensitive cable as line-type heat detector in fire prevention and engineering field both at home and abroad, temperature sensing cable is the cable of a kind of two cores and employing " ON/OFF " formula principle design.Being subjected to heat of solution just can form the short road And of electric wire when the default temperature of two built-in core lead whats reports to the police.The temperature sensing cable relative low price (about 50 yuan/m), but can not locate, the change procedure of the scene temperature of taking precautions against natural calamities can not be forecast.Development in recent years is got up utilizes distributed optical fiber temperature sensor and quasi-distributed fibre optic temperature sensor (mainly containing grating type optical fiber and the Fabry-perot optical fiber type) heat fire detector as line style fire monitoring temperature sensing cable, it can online in real time forecast variation of temperature, can alarm temperature be set in very big temperature range, it is the line-type heat detector of essential safe type, on power industry, petroleum chemical enterprise and civil engineering work, successfully use, but the price of detuner is expensive partially, and range of application is restricted.Developing cheaply, the online in real time optical fiber grating fire monitoring system becomes the task of top priority.
Summary of the invention
The purpose of this utility model provides a kind of low cost, resolution height, the online in real time optical fiber grating fire monitoring system that demodulation speed is fast.
Online in real time optical fiber grating fire monitoring system of the present utility model comprises pigtailed laser diode, fiber optical circulator, the temperature-sensitive optical cable, optical fiber Coarse Wavelength Division Multiplexing detuner, photodetector, digital signal processor and display or alarm, the input end of fiber optical circulator links to each other with pigtailed laser diode, a port of fiber optical circulator links to each other with an end of temperature-sensitive optical cable, on the temperature-sensitive optical cable, be connected with the optical fiber and grating sensing temperature fire detector of n same wavelength, n is a positive integer, the back-scattering light that the temperature-sensitive optical cable produces, reflected light enters the optical fiber Coarse Wavelength Division Multiplexing detuner that the optical fiber and grating sensing temperature detector predominant wavelength displacement conversion that temperature variation is caused becomes light intensity to change by fiber optical circulator, the output terminal of optical fiber Coarse Wavelength Division Multiplexing detuner links to each other with the input end that light intensity is converted to the photodetector of electric signal, the output terminal of photodetector links to each other with the input end of digital signal processor, and the signal output part of digital signal processor connects display or alarm.
In the utility model, it is that 1550nm, spectral bandwidth are 1.6nm that said pigtailed laser diode can adopt wavelength, and pulse width is the laser diode of 28ns.
In the utility model, said optical fiber and grating sensing temperature fire detector is to fire fiber grating with Ultra-Violet Laser irradiation optical fiber grating template on year hydrogen optical fiber to be made, its predominant wavelength is 1550nm, spectral width is 0.1nm, reflectivity is 3dB, is subjected to the predominant wavelength of temperature variation optical grating diffraction to produce 10pm/ ℃ of displacement.Detect by the wavelength shift amount, determine the temperature variation in spatial domain, optical fiber and grating sensing temperature fire detector place.
In the utility model, said optical fiber Coarse Wavelength Division Multiplexing detuner adopts optical fiber to draw the awl method to make, and in the scope of 1552nm, transmitance is with the wavelength change linear growth at 1549nm, and rate of growth is 33.3%/nm.
During the work of online in real time optical fiber grating fire monitoring system, the laser that pigtailed laser diode sends enters fiber optical circulator, the pulse laser that takes place through fiber optical circulator enters the temperature-sensitive optical cable that has the optical fiber and grating sensing temperature fire detector, the back-scattering light that produces, reflected light enters optical fiber Coarse Wavelength Division Multiplexing detuner by fiber optical circulator, the optical fiber and grating sensing temperature detector predominant wavelength displacement conversion that temperature variation is caused becomes intensity variations, convert light intensity to electric signal by photodetector, the output signal of photodetector enters the digital signal processor that has amplification and analog to digital conversion and computing, through Temperature Scaling, provide the temperature change value of each optical fiber and grating sensing temperature fire detector, thereby obtain the temperature variation in fiber grating heat fire detector spatial domain of living on the temperature-sensitive optical cable, utilize optical time domain reflection optical fiber and grating sensing temperature fire detector location (optical fibre radar location).When spatial domain, heat fire detector place temperature during greater than 50 ℃, in 50 ℃ of-150 ℃ of scopes, carry out the forecast of fire on-line monitoring, carry out the telecommunication network transmission by the display demonstration or by communication interface, communications protocol, when spatial domain, the heat fire detector place temperature on the temperature-sensitive optical cable reaches the fire alarm temperature of setting, send fire alarm signal to fire alarm control unit.
The beneficial effects of the utility model are:
Online in real time optical fiber grating fire monitoring system of the present utility model is based on Coarse Wavelength Division Multiplexing demodulation techniques, light time domain analysis technology and optical fiber grating temperature-measuring principle and makes, adopt optical fiber Coarse Wavelength Division Multiplexing detuner that optical fiber and grating sensing temperature fire detector predominant wavelength displacement conversion is become intensity variations, convert light intensity to electric signal by photodetector, demodulation speed is fast.Adopting pulsewidth is the pulse laser of 28ns, can guarantee that minimum temperature-sensitive length is 3m, improves spatial resolution.The utility model can be realized online fire monitoring real-time, and used device cheapness, and cost is low, and cost performance is better than existing temperature sensing cable and other temperature-sensitive optical cable with fire-fighting, helps widespread use.
Description of drawings
Fig. 1 is the synoptic diagram of online in real time optical fiber grating fire monitoring system.
Embodiment
With reference to Fig. 1, online in real time optical fiber grating fire monitoring system of the present utility model comprises pigtailed laser diode 11, fiber optical circulator 12, temperature-sensitive optical cable 13, optical fiber Coarse Wavelength Division Multiplexing detuner 14, photodetector 15, digital signal processor 16 and display or alarm 17, the input end of fiber optical circulator 12 links to each other with pigtailed laser diode 11, a port of fiber optical circulator 12 links to each other with an end of temperature-sensitive optical cable 13, on temperature-sensitive optical cable 13, be connected with the optical fiber and grating sensing temperature fire detector (18) of n same wavelength, n is a positive integer, the back-scattering light that temperature-sensitive optical cable 13 produces, reflected light enters the optical fiber Coarse Wavelength Division Multiplexing detuner 14 that the optical fiber and grating sensing temperature detector predominant wavelength displacement conversion that temperature variation is caused becomes light intensity to change by fiber optical circulator 12, the output terminal of optical fiber Coarse Wavelength Division Multiplexing detuner 14 links to each other with the input end of the photodetector 15 that light intensity is converted to electric signal, the output terminal of photodetector 15 links to each other with the input end of digital signal processor 16, and the signal output part of digital signal processor 16 connects display or alarm 17.
In this example, used optical fiber Coarse Wavelength Division Multiplexing detuner adopts optical fiber to draw the awl method to make, and in the scope of 1552nm, transmitance is with the wavelength change linear growth at 1549nm, and rate of growth is 33.3%/nm.Pigtailed laser diode is that wavelength is that 1550nm, spectral bandwidth are 1.6nm, and pulse width is the laser diode of 28ns.Be laid on the on-the-spot long 10km of temperature-sensitive optical cable that takes precautions against natural calamities, the optical fiber and grating sensing temperature fire detector that is connected on the temperature-sensitive optical cable has 50,50 optical fiber and grating sensing temperature fire detectors have same wavelength 1550nm, spectral width is 0.1nm, reflectivity is 3dB, and the optical fiber and grating sensing temperature fire detector is acted upon by temperature changes, and the predominant wavelength of optical grating diffraction produces 10pm/ ℃ of displacement, the wavelength shift amount is detected, determine the temperature variation in spatial domain, optical fiber and grating sensing temperature fire detector place.Needs design according to the engineering of taking precautions against natural calamities arranges the optical fiber and grating sensing temperature fire detector that quantity and position are installed on the optical fiber and grating sensing temperature optical cable.
Claims (4)
1. online in real time optical fiber grating fire monitoring system, it is characterized in that comprising pigtailed laser diode (11), fiber optical circulator (12), temperature-sensitive optical cable (13), optical fiber Coarse Wavelength Division Multiplexing detuner (14), photodetector (15), digital signal processor (16) and display or alarm (17), the input end of fiber optical circulator (12) links to each other with pigtailed laser diode (11), a port of fiber optical circulator (12) links to each other with an end of temperature-sensitive optical cable (13), on temperature-sensitive optical cable (13), be connected with the optical fiber and grating sensing temperature fire detector (18) of n same wavelength, n is a positive integer, the back-scattering light that temperature-sensitive optical cable (13) produces, reflected light enters the optical fiber Coarse Wavelength Division Multiplexing detuner (14) that the optical fiber and grating sensing temperature detector predominant wavelength displacement conversion that temperature variation is caused becomes light intensity to change by fiber optical circulator (12), the output terminal of optical fiber Coarse Wavelength Division Multiplexing detuner (14) links to each other with the input end of the photodetector (15) that light intensity is converted to electric signal, the output terminal of photodetector (15) links to each other with the input end of digital signal processor (16), and the signal output part of digital signal processor (16) connects display or alarm (17).
2. online in real time optical fiber grating fire monitoring system according to claim 1 is characterized in that pigtailed laser diode (11) is that wavelength is that 1550nm, spectral bandwidth are 1.6nm, and pulse width is the laser diode of 28ns.
3. online in real time optical fiber grating fire monitoring system according to claim 1 is characterized in that temperature-sensitive optical cable (13) is the long G652 single-mode fiber of 10km, and the optical fiber and grating sensing temperature fire detector (18) that is connected on the temperature-sensitive optical cable (13) has 50.
4. online in real time optical fiber grating fire monitoring system according to claim 1 is characterized in that said optical fiber Coarse Wavelength Division Multiplexing detuner (14) in 1549nm arrives the 1552nm scope, and transmitance increases with wavelength linear, and rate of growth is 33.3%/nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820122224XU CN201266418Y (en) | 2008-07-25 | 2008-07-25 | On-line real time fibre-optical grating fire monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU200820122224XU CN201266418Y (en) | 2008-07-25 | 2008-07-25 | On-line real time fibre-optical grating fire monitoring system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| AU2013201528A1 (en) * | 2012-05-31 | 2013-12-19 | Kidde Technologies, Inc | Optical fiber sensing system |
| CN110907060A (en) * | 2019-11-29 | 2020-03-24 | 武汉理工光科股份有限公司 | Fault automatic multiplexing system and method of fiber bragg grating array oil tank fire alarm monitoring system |
-
2008
- 2008-07-25 CN CNU200820122224XU patent/CN201266418Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2013201528A1 (en) * | 2012-05-31 | 2013-12-19 | Kidde Technologies, Inc | Optical fiber sensing system |
| 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 |
| CN110907060A (en) * | 2019-11-29 | 2020-03-24 | 武汉理工光科股份有限公司 | Fault automatic multiplexing system and method of fiber bragg grating array oil tank fire alarm monitoring system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: HANGZHOU OUYI OPTOELECTRONICS CO., LTD. Free format text: FORMER OWNER: CHINA METROLOGY COLLEGE Effective date: 20100319 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 310018 XUEYUAN STREET, XIASHA HIGHER EDUCATION PARK ZONE, HANGZHOU CITY, ZHEJIANG PROVINCE TO: 310018 NO.258, XUEYUAN STREET, XIASHA HIGHER EDUCATION PARK ZONE, HANGZHOU CITY, ZHEJIANG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20100319 Address after: Hangzhou City, Zhejiang province 310018 Xiasha Higher Education Park source Street No. 258 Patentee after: Hangzhou OE Photoelectric Technology Co., Ltd. Address before: 310018 Xiasha Higher Education Park, Zhejiang, Hangzhou Patentee before: China Jiliang University |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090701 Termination date: 20120725 |