CN108760080B - A kind of distributed fiber Raman temperature measuring equipment and method based on ASE noise - Google Patents
A kind of distributed fiber Raman temperature measuring equipment and method based on ASE noise Download PDFInfo
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Abstract
The present invention relates to distributed optical fiber sensing system, specially a kind of distributed fiber Raman temperature measuring equipment and method based on ASE noise.The present invention solves the contradiction between spatial resolution present in the existing distributed fiber Raman temp measuring system based on pulsed light and measurement distance, overcomes the problem of bringing system performance to decline in itself as transducing signal due to chaotic laser light in the distributed fiber Raman temp measuring system based on chaotic laser light.This system includes ASE noise light source, the first adjustable light wave-filter, the one 1 × 2nd fiber coupler, photodetector, optical circulator, the 21 × 2nd fiber coupler, the second adjustable light wave-filter, the first avalanche photodetector, the first low noise amplifier, third adjustable light wave-filter, the second avalanche photodetector, the second low noise amplifier, data collecting card, computer, sensor fibre.
Description
Technical field
The present invention relates to distributed optical fiber sensing system, specifically a kind of distributed fiber Raman based on ASE noise
Temperature measuring equipment and method.
Background technique
Building such as seabed tunnel, bridge tunnel, skyscraper, huge factory etc. is more and more, once these
The accidents such as fire occurred can not only be resulted in significant economic losses to country, can also bring huge casualties.Such as:
About when 15 days 11 March in 2004, Jilin Province Jilin ZhongBai Mall Rat occur wildfire, fire ultimately cause 54 people death, 70
It is injured with people, 4,260,000 yuan of direct economic loss；On November 22nd, 2008, the Lvliang City of Shanxi Province Lishi District Business Building Jin Tian hair
It lights a fire calamity, 8 people are dead；When 15 days 14 November in 2010, Shanghai Yuyao road Jiangzhou Lu Yidong high-rise apartment building is on fire, and high fire is final
Cause 58 people wrecked, separately there are more than 70 people injured.Any accident is impossible to occur suddenly, and especially the accidents such as fire are being sent out
Before life, can all there are some omens, for example temperature can be significantly hotter than the temperature of working time or temperature is flown up, in time
It was found that these temperature changes will avoid the generation of accident.Therefore, develop a reliable temp measuring system for accidents such as fire
Prevention be particularly important.
Currently, the distributed optical fiber sensing temperature measurement system based on Raman scattering, can be realized in optical path continuous over long distances
Temperature information measurement, and system cost is lower, cost performance with higher, therefore is widely used.For example, Chongqing is big
Mediate et al. the distributed fiber Raman temperature-sensing system developed of golden clock is learned, the spatial resolution of 1m is realized, measures apart from small
In 5 km [distributed Raman temp measuring system of the mediate of Zhu Haipeng, Jin Zhong based on multimode fibre, photonics journal, 2015,44 (01),
75-79]；Metering university Zhang Xuan research team, China develops a set of 30 km Long Distance Distributed Optical Fiber Raman Temperature Sensor system
System, spatial resolution reaches 4 m, and [Zhang Xuan, Wang Jianfeng, Liu Honglin, Yu Xiangdong, Guo Ning, Insoo S.KIM, 30km are long-range
Profile fiber Raman temperature sensors system, optoelectronic laser, 2004 (10), 1174-1177].Existing distribution type fiber-optic
Laser source used in Raman sensing technology is mainly pulse laser.For pulse laser, one side receiving end response accuracy is wanted
Ask high, signal capture is difficult；On the other hand, system monitoring distance is directly proportional to pulsewidth, and spatial resolution is inversely proportional with pulsewidth, such as
Fruit narrows pulsewidth and will cause the reduction of monitoring distance to improve spatial resolution, so as to cause monitoring distance and spatial discrimination
Contradictory problems between rate.Currently based on the distributed fiber Raman sensor-based system of pulse laser, spatial resolution is at 1 meter
More than, it is difficult to meet the needs of practical application.In order to solve the problems, such as spatial resolution and monitoring distance contradiction, one kind is based on mixed
The distributed fiber Raman temp measuring system of ignorant laser is suggested [Chinese patent: ZL 201110227239.9], and still, chaos swashs
Light is usually to be generated by light feedback or light injection or light feedback joint light injection disturbance semiconductor laser, can contain light
The periodic signal that injection, light feedback introduce, this can seriously affect the spatial resolution of Raman temp measuring system.Meanwhile generating spectrum
Chaotic laser light signal adjustable, coherence length is controllable, need to cooperate adjusting multiple parameters, light-source structure and realize process it is complicated,
It is time-consuming.
Therefore, it is necessary to develop a kind of new Raman temp measuring system, makes it not only and can solve traditional Raman temp measuring system
Contradiction between existing spatial resolution and monitoring distance can also overcome due to chaotic laser light as transducing signal and itself
The problem of bringing system performance to decline.
Summary of the invention
The present invention is provided one kind and is made an uproar based on ASE to solve the problems, such as existing distributed Raman temp measuring system
The distributed fiber Raman temperature measuring equipment and method of sound.
The present invention adopts the following technical scheme that realization:
A kind of distributed fiber Raman temperature measuring equipment based on ASE noise signal, including it is ASE noise light source, first adjustable
It is humorous optical filter, the one 1 × 2nd fiber coupler, photodetector, optical circulator, the 21 × 2nd fiber coupler, second adjustable
Humorous optical filter, the first avalanche photodetector, the first low noise amplifier, third adjustable light wave-filter, the second avalanche optoelectronic
Detector, the second low noise amplifier, data collecting card, computer, sensor fibre；
Wherein the output end of ASE noise light source passes through the input of general single mode fiber wire jumper and the first adjustable light wave-filter
End is connected, and the output end of the first adjustable light wave-filter is entered by general single mode fiber wire jumper and the one 1 × 2nd fiber coupler
It penetrates end to be connected, one of output end of the one 1 × 2nd fiber coupler is connected with the input terminal of photodetector, photodetection
The output end of device is connected by coaxial wire with the first input end of data collecting card；One 1 × 2nd fiber coupler it is another
A output end is connected by general single mode fiber wire jumper with the incidence end of optical circulator, and the reflection end of optical circulator passes through common single
Mode fiber wire jumper is connected with sensor fibre, and the output end of optical circulator passes through general single mode fiber wire jumper and the 21 × 2nd optical fiber coupling
The incidence end of clutch is connected, and one of output end of the 21 × 2nd fiber coupler is connected with the second adjustable light wave-filter,
The output end of second adjustable light wave-filter passes through the input terminal phase of general single mode fiber wire jumper and the first avalanche photodetector
Even, the output end of the first avalanche photodetector is connected by coaxial wire with the first low noise amplifier, the amplification of the first low noise
The output end of device is connected by coaxial wire with the second input terminal of data collecting card；21 × 2nd fiber coupler it is another
A output end is connected with third adjustable light wave-filter, and the output end of third adjustable light wave-filter is jumped by general single mode fiber
Line is connected with the input terminal of the second avalanche photodetector, the output end of the second avalanche photodetector by coaxial wire with
Second low noise amplifier is connected, and the output end of the second low noise amplifier is inputted by the third of coaxial wire and data collecting card
End is connected；The output end of data collecting card is connected to a computer.
A kind of distributed fiber Raman temp measuring method based on ASE noise signal, this method specific work process are as follows:
A. it is suitable to generate spectral bandwidth by the first adjustable light wave-filter for the noise signal that ASE noise light source generates
Noise optical signal, two-way is then divided by 1 × 2 fiber coupler, wherein optical signal is as reference light all the way, and through photoelectricity
Detector is converted to electric signal, then is input to data collecting card；Another way optical signal is entered as pump light by optical circulator
Sensor fibre, and Raman rear orientation light is generated at optical fiber each point, then Raman rear orientation light passes through the anti-of optical circulator
It penetrates end to be injected into optical circulator, then the output of the output end through optical circulator；The Raman rear orientation light of output by the 2nd 1 ×
2 fiber couplers are divided into two-way, wherein optical signal filters out backward Stokes by the second adjustable light wave-filter all the way
Light, the stokes light filtered out are converted to electric signal by the first avalanche photodetector, then by the first low noise amplifier into
Row amplification, then it is input to data collecting card；Another way optical signal by the output of the second fiber coupler is tunable by third
Optical filter filters out anti-Stokes light, is then converted to electric signal by the second avalanche photodetector, low using second
Amplifier of making an uproar amplifies, then is input in data collecting card, is input in computer after A/D conversion；
B. computer is under the support of corresponding software, the anti-Stokes light obtained using pump light back scattering it is strong
The characteristic changed with temperature linearity is spent, it is each that the intensity ratio by calculating anti-Stokes light and stokes light obtains sensor fibre
The temperature information of section；By to making computing cross-correlation processing between Stokes optical signal and reference optical signal, so that it may determine
The position signal of fiber optic temperature out.
Based on the above process, compared with existing distributed fiber Raman temp measuring system, one kind of the present invention is based on
The distributed fiber Raman temperature measuring equipment and method of ASE noise source have the advantages that
(1) spatial resolution determines two temperature on sensor fibre that distributed sensing system can identify not same district
Minimum range between domain is a key technical index of distributed sensing temp measuring system.For the Raman based on pulsed light
Temp measuring system, it is determined by the width of light pulse in injection fibre；Increase pulse width, will increase monitoring distance, but again
It will lead to the reduction of spatial resolution, thus there are problems that monitoring distance and spatial resolution contradiction；And the present invention uses ASE
The shape of class δ function is presented in noise signal, correlation curve, and spatial resolution is by Stokes optical signal and reference optical signal
Between on cross-correlation curve the full width at half maximum of relevant peaks determine that and unrelated with distance sensing, monitoring distance length is by signal source
Watt level determine, this is fundamentally solved supervises in the existing distributed fiber Raman temp measuring system based on pulse optical detection
Ranging is from the contradictory problems between spatial resolution.It can make to measure distance and reach 100 kilometers or more, spatial resolution reaches li
Rice magnitude.
(2) patent of invention (ZL 201110227239.9) provides a kind of distributed fiber Raman based on chaotic laser light
Temp measuring system can solve monitoring distance and spatial resolution in the distributed fiber Raman temp measuring system based on pulse optical detection
Between contradiction.But chaotic laser light is usually partly to be led by light feedback or light injection or light feedback joint light injection disturbance
Body laser generates, and can inject containing light, the periodic signal that light feedback introduces, this can seriously affect the space of Raman temp measuring system
Resolution ratio.Meanwhile the chaotic laser light signal that spectrum is adjustable, coherence length is controllable is generated, adjusting multiple parameters, light source need to be cooperated
Structure and realization process are complicated, time-consuming.And ASE noise optical signal used in the present invention, by erbium-doped fiber amplifier or partly lead
Body image intensifer generates.The adjusting of its spectral width (or coherence length), can realize simply by tunable optical filter, because
This, the spatial resolution (being determined by the coherence length of ASE noise) of sensor-based system described herein is easier to control.Thus may be used
See, not only fundamentally effectively solves the problems, such as that spatial resolution is limited using ASE noise light source, and system structure can be made
Simpler, system cost is lower.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of distributed fiber Raman temperature measuring equipment based on ASE noise of the present invention.
In figure: 1-ASE noise light source, the first adjustable light wave-filter of 2-, the one 1 × 2nd fiber coupler of 3-, 4- photoelectricity are visited
Survey device, 5- optical circulator, the 21 × 2nd fiber coupler of 6-, the second adjustable light wave-filter of 7-, the detection of the first avalanche optoelectronic of 8-
Device, the first low noise amplifier of 9-, 10- third adjustable light wave-filter, the second avalanche photodetector of 11-, the second low noise of 12-
Big device, 13- data collecting card, 14- computer, 15- sensor fibre.
Specific embodiment
A kind of distributed fiber Raman temperature measuring equipment based on ASE noise, including ASE noise light source, the first tunable optical
Filter, the one 1 × 2nd fiber coupler, photodetector, optical circulator, the 21 × 2nd fiber coupler, the second tunable optical
Filter, the first avalanche photodetector, the first low noise amplifier, third adjustable light wave-filter, the detection of the second avalanche optoelectronic
Device, the second low noise amplifier, data collecting card, computer, sensor fibre.
Wherein the output end of ASE noise light source 1 passes through the input terminal phase of general single mode wire jumper and the first tunable filter 2
Even, the output end of the first adjustable light wave-filter 2 passes through the incidence of general single mode fiber wire jumper and the one 1 × 2nd fiber coupler 3
End is connected, and one of output end of the one 1 × 2nd fiber coupler 3 is connected with the input terminal of photodetector 4, photodetection
The output end of device 4 is connected by coaxial wire with one of input terminal of data collecting card 13；One 1 × 2nd fiber coupling
The another output of device 3 is connected by general single mode fiber wire jumper with the incidence end of optical circulator 5, the reflection of optical circulator 5
End is connected by general single mode fiber wire jumper with sensor fibre 15, and the output end of optical circulator 5 passes through general single mode fiber wire jumper
It is connected with the incidence end of the 21 × 2nd fiber coupler 6, one of output end and second of the 21 × 2nd fiber coupler 6
Adjustable light wave-filter 7 is connected, and the output end of the second adjustable light wave-filter 7 passes through general single mode fiber wire jumper and the first snowslide
The input terminal of photodetector 8 is connected, and the output end of the first avalanche photodetector 8 passes through coaxial wire and the first low noise
Big device 9 is connected, and the output end of the first low noise amplifier 9 passes through one of input terminal of coaxial wire and data collecting card 13
It is connected；The another output of 21 × 2nd fiber coupler 6 is connected with third adjustable light wave-filter 10, third tunable optical
The output end of filter 10 is connected by general single mode fiber wire jumper with the input terminal of the second avalanche photodetector 11, the second snow
The output end for collapsing photodetector 11 is connected by coaxial wire with the second low noise amplifier 12, the second low noise amplifier 12
Output end is connected by coaxial wire with one of input terminal of data collecting card 13；The output end and meter of data collecting card
Calculation machine 14 is connected.
A kind of distributed fiber Raman temp measuring method based on ASE noise, this method specific work process are as follows:
A. the noise signal that ASE noise light source 1 generates generates spectral bandwidth and closes by the first adjustable light wave-filter 2
Then suitable noise optical signal is divided by 1 × 2 fiber coupler 3 for two-way, wherein optical signal (lower road) is as reference all the way
Light, and electric signal is converted to through photodetector 4, then be input to data collecting card 13；Another way optical signal (upper road) is as pump
Pu light enters sensor fibre 15 by optical circulator 5, and generates Raman rear orientation light at optical fiber each point, then after Raman
It is injected into optical circulator 5 to scattering light by the reflection end of optical circulator 5, then the output of the output end through optical circulator 5.Output
Raman rear orientation light divided by the 21 × 2nd fiber coupler 6 for two-way, wherein optical signal (left) passes through second all the way
Adjustable light wave-filter 7 filters out backward stokes light, and the stokes light filtered out enters the first avalanche photodetector 8,
Electric signal is converted optical signals to, is then amplified by the first low noise amplifier 9, then be input to data collecting card 13；Through
The another way optical signal (right wing) for crossing the output of the second fiber coupler 6 filters out anti-stoke by third adjustable light wave-filter 10
Then this light is converted to electric signal by the second avalanche photodetector 11, amplifies using the second low noise amplifier 12,
It is input in data collecting card 13, is input in computer 14 after A/D conversion again；
B. computer is under the support of Matlab software, the anti-Stokes light obtained using pump light back scattering
The characteristic that intensity changes with temperature linearity, by calculating anti-Stokes light and to obtain optical fiber with the intensity of stokes light ratio each
The temperature information of section；By to making computing cross-correlation processing between Stokes optical signal and reference optical signal, so that it may determine
The position signal of fiber optic temperature out.
When it is implemented, the central wavelength of ASE noise light source 1 is 1550nm, spectral bandwidth is 5 ~ 30GHz；First is adjustable
Humorous optical filter 2, the second adjustable light wave-filter 7, third adjustable light wave-filter 10 can using the wavelength and bandwidth of TM-50 type
Tuned light wave filter；One 1 × 2nd fiber coupler 3 and 6 coupling ratio of the 21 × 2nd fiber coupler are 50:50；First snowslide light
Electric explorer 8 and the second avalanche photodetector 11 use Fby photoelectric, the snowslide light of DTS1550-DA-MM type
Electric explorer；Sensor fibre 15 uses multimode fibre.
Claims (2)
1. a kind of distributed fiber Raman temperature measuring equipment based on ASE noise signal, including it is ASE noise light source (1), first adjustable
Humorous optical filter (2), the one 1 × 2nd fiber coupler (3), photodetector (4), optical circulator (5), the 21 × 2nd optical fiber coupling
Clutch (6), the second adjustable light wave-filter (7), the first avalanche photodetector (8), the first low noise amplifier (9), third can
Tuned light wave filter (10), the second avalanche photodetector (11), the second low noise amplifier (12), data collecting card (13), meter
Calculation machine (14), sensor fibre (15)；
The output end of first adjustable light wave-filter (2) passes through general single mode fiber wire jumper and the one 1 × 2nd fiber coupler (3)
Incidence end be connected, the input terminal phase of the one of output end and photodetector (4) of the one 1 × 2nd fiber coupler (3)
Even, the another output of the one 1 × 2nd fiber coupler (3) passes through the incidence of general single mode fiber wire jumper and optical circulator (5)
End is connected, and the reflection end of optical circulator (5) is connected by general single mode fiber wire jumper with sensor fibre (15), optical circulator (5)
Output end be connected with the incidence end of the 21 × 2nd fiber coupler (6) by general single mode fiber wire jumper, the 21 × 2nd optical fiber
One of output end of coupler (6) is connected with the second adjustable light wave-filter (7), the second adjustable light wave-filter (7)
Output end is connected by general single mode fiber wire jumper with the input terminal of the first avalanche photodetector (8), and the first avalanche optoelectronic is visited
The output end for surveying device (8) is connected by coaxial wire with the first low noise amplifier (9), the output of the first low noise amplifier (9)
End is connected by coaxial wire with the second input terminal of data collecting card (13)；21 × 2nd fiber coupler (6) it is another
A output end is connected with third adjustable light wave-filter (10), and the output end of third adjustable light wave-filter (10) passes through common single
Mode fiber wire jumper is connected with the input terminal of the second avalanche photodetector (11), the output end of the second avalanche photodetector (11)
It is connected by coaxial wire with the second low noise amplifier (12), the output end of the second low noise amplifier (12) passes through coaxial cable
Line is connected with the third input terminal of data collecting card (13)；The output end of data collecting card (13) is connected with computer (14)；
It is characterized in that, wherein the output end of ASE noise light source (1) passes through general single mode fiber wire jumper and the first adjustable light wave-filter
(2) input terminal is connected, the first input that the output end of photodetector (4) passes through coaxial wire and data collecting card (13)
End is connected.
2. a kind of distributed fiber Raman temp measuring method based on ASE noise signal, using device described in claim 1 come real
It is existing, it is characterised in that: this method specific work process is as follows:
A. the noise signal that ASE noise light source (1) generates generates spectral bandwidth and closes by the first adjustable light wave-filter (2)
Then suitable noise optical signal is divided into two-way by 1 × 2 fiber coupler (3), wherein all the way optical signal as reference light, and
Electric signal is converted to through photodetector (4), then is input to data collecting card (13)；Another way optical signal leads to as pump light
Optical circulator (5) are crossed into sensor fibre (15), and generate Raman rear orientation light at optical fiber each point, then to scattered after Raman
It penetrates light to be injected into optical circulator (5) by the reflection end of optical circulator (5), then the output of the output end through optical circulator (5)；It is defeated
Raman rear orientation light out is divided into two-way by the 21 × 2nd fiber coupler (6), wherein optical signal can by second all the way
Tuned light wave filter (7), filters out backward stokes light, and the stokes light filtered out is by the first avalanche photodetector (8)
Electric signal is converted to, is then amplified by the first low noise amplifier (9), then be input to data collecting card (13)；By
The another way optical signal of two fiber couplers (6) output filters out anti-Stokes light by third adjustable light wave-filter (10),
Then electric signal is converted to by the second avalanche photodetector (11), is amplified using the second low noise amplifier (12),
It is input in data collecting card (13), is input in computer (14) after A/D conversion again；
B. computer (14) is under the support of corresponding software, the anti-Stokes light obtained using pump light back scattering it is strong
The characteristic changed with temperature linearity is spent, the intensity ratio by calculating anti-Stokes light and stokes light obtains sensor fibre
(15) each section of temperature information；By to making computing cross-correlation processing between Stokes optical signal and reference optical signal, so that it may
To determine the position signal of fiber optic temperature.
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| CN201810482262.4A CN108760080B (en) | 2018-05-18 | 2018-05-18 | A kind of distributed fiber Raman temperature measuring equipment and method based on ASE noise |
| PCT/CN2019/000080 WO2019218690A1 (en) | 2018-05-18 | 2019-04-29 | Distributed fiber raman temperature-measuring apparatus and method based on ase noise |
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| CN201810482262.4A CN108760080B (en) | 2018-05-18 | 2018-05-18 | A kind of distributed fiber Raman temperature measuring equipment and method based on ASE noise |
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| CN108760080B (en) * | 2018-05-18 | 2019-10-08 | 太原理工大学 | A kind of distributed fiber Raman temperature measuring equipment and method based on ASE noise |
| CN112132256B (en) * | 2020-08-05 | 2023-12-08 | 芯华创(武汉)光电科技有限公司 | Raman distributed temperature sensing method and system based on neural network |
| CN112378432B (en) * | 2020-10-29 | 2023-08-15 | 太原理工大学 | Distributed optical fiber Raman sensing device and method based on noise matched filtering |
| CN112556875B (en) * | 2020-12-01 | 2022-05-24 | 太原理工大学 | Distributed optical fiber Raman sensing system and method for gas pipe network leakage |
| CN112880866B (en) * | 2021-03-25 | 2023-09-12 | 太原理工大学 | Long-distance high-spatial-resolution Raman fiber multi-parameter sensing system and method |
| CN113091947B (en) * | 2021-04-19 | 2023-06-30 | 太原理工大学 | ASE time domain related compression distributed optical fiber Raman temperature sensing device and method |
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| JP5152540B2 (en) * | 2010-06-22 | 2013-02-27 | 横河電機株式会社 | Optical fiber temperature distribution measuring device |
| US9759585B2 (en) * | 2012-03-02 | 2017-09-12 | Ofs Fitel, Llc | TDM- and WDM-based FBG sensor array system |
| CN102680138B (en) * | 2012-06-07 | 2014-06-25 | 北京航空航天大学 | Double-direction four-channel coupled distribution-type optical-fiber Raman temperature measuring system |
| CN102680137B (en) * | 2012-06-07 | 2014-08-13 | 北京航空航天大学 | Cascading distributed fiber Raman temperature measuring system |
| JP6206351B2 (en) * | 2014-07-15 | 2017-10-04 | 横河電機株式会社 | Optical fiber temperature distribution measuring device |
| JP6428350B2 (en) * | 2015-02-18 | 2018-11-28 | 富士通株式会社 | Temperature measuring system, temperature measuring method and program |
| CN105043586B (en) * | 2015-05-28 | 2018-01-09 | 华中科技大学 | A kind of Raman distributed temp measuring system and temp measuring method based on less fundamental mode optical fibre |
| CN105136179B (en) * | 2015-08-27 | 2017-09-22 | 太原理工大学 | Distribution type optical fiber sensing equipment and method based on ASE noise coherent detections |
| CN205562071U (en) * | 2016-04-28 | 2016-09-07 | 山西大同大学 | Novel distributed optical fiber sensing temperature alarm system |
| CN105784195B (en) * | 2016-05-10 | 2018-04-06 | 太原理工大学 | The distribution type optical fiber sensing equipment and method of single-ended chaos Brillouin optical time domain analysis |
| CN105783762B (en) * | 2016-05-10 | 2018-04-06 | 太原理工大学 | The brillouin distributed optical fiber sensing device and method of chaos correlation method positioning |
| CN107664541A (en) * | 2017-09-18 | 2018-02-06 | 南京大学 | A kind of distributed optical fiber vibration and Temperature fusion sensor-based system and method |
| CN108760080B (en) * | 2018-05-18 | 2019-10-08 | 太原理工大学 | A kind of distributed fiber Raman temperature measuring equipment and method based on ASE noise |
-
2018
- 2018-05-18 CN CN201810482262.4A patent/CN108760080B/en not_active Expired - Fee Related
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2019
- 2019-04-29 WO PCT/CN2019/000080 patent/WO2019218690A1/en active Application Filing
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| CN108760080A (en) | 2018-11-06 |
| WO2019218690A1 (en) | 2019-11-21 |
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