CN102661755A - Fiber Bragg grating-based extensible distributed sensing system - Google Patents
Fiber Bragg grating-based extensible distributed sensing system Download PDFInfo
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Abstract
The invention relates to a fiber Bragg grating-based extensible distributed sensing system. The system is technically characterized by comprising a broadband light source, an optical loop device, a plurality of fiber Bragg grating sensors with different grating periods, an extensible light-wave demultiplexing separator, an optical etalon, a plurality of light sensing signal detectors and a signal processing system, wherein the output of the broadband light source is connected to an optical fiber with a distributed fiber Bragg grating through the optical loop device; light reflected from the fiber Bragg grating is output to the input port of the extensible light-wave demultiplexing separator from a port of the optical loop device, and is output to the optical etalon through each output port of the extensible light-wave demultiplexing separator; the light sensing signal detectors receive a light beams output from the optical etalon; and the signal processing system performs real-time signal processing on each sensing signal. The system is reasonable in design; and the invention has the characteristics that the system is low in cost, high in real-time performance, easy to extend and produce and the like.
Description
Technical field
The invention belongs to photoelectric field, especially a kind of scalable distributed sensor-based system based on Fiber Bragg Grating FBG.
Background technology
In in the past 20 years, a large amount of innovations has greatly reduced the price of optical device in optoelectronic development and the optical fiber communication industry, has improved quality.Fibre Optical Sensor has expanded to on-the-spot practical application from the laboratory examination conceptual phase, such as health monitoring application of building structure etc.Optical fiber sensing system has anti-electromagnetic interference (EMI) and characteristics such as moist, corrosion-resistant, in light weight, and, the transmission that is easy to form sensing network He carries out the remote recording signal.Fiber Bragg Grating FBG (FBG) sensor is the Fibre Optical Sensor that a kind of frequency of utilization is the highest, range of application is the widest.This sensor can change the wavelength of the light wave of its reflection according to the variation of environment temperature and/or strain.Because Fiber Bragg Grating FBG can be made into different specific reflection wavelength, therefore, can on the individual fibers of a long distance, connect a plurality of different sensors that have the specific Bragg grating cycle with the series connection form.Fiber Bragg Grating FBG has intrinsic wavelength characteristic, though in transmission course because the bending of fiber medium and transmission have caused the loss and the decay of light intensity, also can guarantee the result's that sensor records accuracy.
The spectral width of wideband light source, each quantity of operating wavelength range and the detectable total wavelength coverage of wavelength detecting etc. of the fiber Bragg grating sensor Bragg grating that determined on an independent optical fiber, can to articulate independently.In general; Because strain changes the wavelength shift that causes can be more obvious than the wavelength shift that temperature change causes; Therefore, generally can distribute the operating wavelength range of general 5 nanometers for the FBG strain transducer, the FBG temperature sensor then distributes the operating wavelength range of general 1 nanometer; Simultaneously because the test specification that common wideband light source and wavelength detecting can provide probably is 60 to 80 nanometers, therefore, the number of sensors that articulates on optical fiber generally can not wait from 1 to 80.General FBG sensor can have the operating wavelength range of several nanometers, is several micromicrons even littler measurement so wavelength detecting must be able to be accomplished resolution, and this is a quite little magnitude.The detection of the wavelength change in the FBG grating sensor can have following several method:
First method: interferometer is usually the laboratory equipment of utilization, and it can provide quite high-resolution spectral analysis, still; These instruments are in general very expensive, bulky and firm inadequately, therefore; Relate in the application of field monitoring of various structures at some, like fan blade, bridge; In the monitoring of environment such as water pipe and dam, these instruments are all inapplicable.
Second method: introduce charge-coupled image sensor (charge-coupled device-CCD) and fixing dispersive element; Generally be meant the wavelength location conversion; In this method, use a wideband light source irradiation FBG sensor (perhaps a series of FBG sensor).These folded light beams can be passed through a dispersivity unit, and the folded light beam that the dispersivity unit can be different with wavelength is assigned to the different sites in charge-coupled device (CCD) surface respectively.This method can be measured all FBG sensors that are articulated on the optical fiber fast and side by side, but it only provides very finite resolution and signal to noise ratio (snr).
Present most popular method is to utilize adjustable enamel amber wave filter to create a branch of high-energy that has, and lasing light emitter that can rapid frequency-sweeping replaces traditional wideband light source.Tunable laser source a very narrow wavelength coverage the inside, provides one to have the very high-octane light source of high s/n ratio concentration of energy.The high luminous power that this structure provides lets uses a plurality of optical channels of optical fiber carry to become possibility, so just can reduce the cost of multichannel light transducing signal detecting device and the complexity of reduction system effectively.Transducing signal detecting device based on this tunable laser can scan with very narrow band a big relatively wavelength coverage the inside; Simultaneously; Light transducing signal detecting device will with this scan-synchronized, measure the laser beam that reflects from the FBG sensor.When the bragg wavelength of tunable laser emitted laser wavelength and FBG sensor coincide; Light transducing signal detecting device with regard to energy measurement to corresponding response, when this response takes place the wavelength of tunable laser just corresponding the temperature and/or the strain that record of FBG sensor place at this moment.The shortcoming of this method is that tunable laser is relatively more expensive.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, the scalable distributed sensor-based system based on Fiber Bragg Grating FBG that a kind of cost is low, real-time good and be easy to expand is provided.
The present invention solves existing technical matters and takes following technical scheme to realize:
A kind of scalable distributed sensor-based system based on Fiber Bragg Grating FBG, the optical loop device, that comprises wideband light source, three port band optical fiber pigtails of a band optical fiber pigtail comprise a plurality of OWDM expanded separation vessels with the fiber Bragg grating sensor in different grating cycles, a band optical fiber pigtail, light standard tool and a plurality of smooth transducing signal detecting device and signal processing system; The output of the wideband light source of described band optical fiber pigtail is connected to the input port of the optical loop device of band optical fiber pigtail; The transmission output port of the optical loop device of described band optical fiber pigtail is connected to fiber Bragg grating sensor; The reflection output port of the optical loop device of this band optical fiber pigtail is connected to the input port of the OWDM the expanded separation vessel of band optical fiber pigtail; The output collimated light beam of the output port of the OWDM the expanded separation vessel of described band optical fiber pigtail to be getting into the light standard tool near the zero degree incident angle, described smooth transducing signal detecting device is arranged at and receives the light transducing signal that sees through from the light standard tool behind institute's light standard tool and carry out real time signal processing by signal processing system.
And the width of the output spectrum of the wideband light source of described band optical fiber pigtail is greater than 10 nanometers.
And the optical loop device of described three port band optical fiber pigtails comprises the reflection output port of the transmission output port and a band optical fiber pigtail of the input port of a band optical fiber pigtail, a band optical fiber pigtail.
And; The OWDM the expanded separation vessel of described band optical fiber pigtail is connected and composed by a plurality of single channel OWDM separation vessels successively; The transmitted light spectral range of the output port of each single channel OWDM separation vessel is greater than 2 nanometers; The transmitted light spectral wavelength of adjacent two output ports is at interval about equally and greater than the transmitted light spectral range of each output port; This can expand center light wavelength and last Bragg grating that comprises a plurality of fiber Bragg grating sensors with different grating cycle identical of first output port of OWDM separation vessel, and this can expand center light wavelength and first Bragg grating that comprises a plurality of fiber Bragg grating sensors with different grating cycle identical of last output port of OWDM separation vessel.
And; Described adjacent two the catoptrical wavelength intervals of Bragg grating that comprise a plurality of fiber Bragg grating sensors with different grating cycles are greater than 2 nanometers; The centre wavelength of the catoptrical reflectance spectrum of each Bragg grating is at interval near equating that this comprises a plurality of orderings with the fiber Bragg grating sensor in different grating cycles and is beneficial to the intensity of each sensor signal of balance at light transducing signal detecting device with the opposite ordering that can expand the OWDM separation vessel.
And; Described light standard prodigiosin enough receives the output light of the OWDM the expanded separation vessel of all band optical fiber pigtails; The Free Spectral Range of this light standard tool is identical with adjacent two the catoptrical wavelength intervals of Bragg grating that comprise a plurality of fiber Bragg grating sensors with different grating cycle; The peak value of its transmitted light wavelength is greater than or less than the catoptrical centre wavelength of Bragg grating, and makes the catoptrical centre wavelength of Bragg grating be positioned near the center of rising or negative edge of transmitted light spectrum curve of light standard tool; The acutance coefficient of this light standard tool makes the catoptrical wavelength variation range of fiber Bragg grating sensor all be in the rising or negative edge of transmitted light spectrum curve of light standard tool.
And the spectral response range of described smooth transducing signal detecting device is identical with the catoptrical wavelength variation range of fiber Bragg grating sensor.
And described signal processing system is carried out real time signal processing to the input signal of each light transducing signal detecting device.
And the optical fiber pigtail of each port of the optical loop device of the wideband light source of described band optical fiber pigtail, described three port band optical fiber pigtails, the described OWDM the expanded separation vessel that comprises a plurality of fiber Bragg grating sensors with different grating cycles and band optical fiber pigtail adopts the arc welding or the joints of optical fibre to be connected.
And the single channel OWDM separation vessel quantity of the OWDM the expanded separation vessel of described band optical fiber pigtail, the Bragg grating sensor quantity and the light transducing signal detector number that comprise a plurality of fiber Bragg grating sensors with different grating cycles are identical.
Advantage of the present invention and good effect are:
The present invention is reasonable in design; Its with wideband light source as light source; The reflection wavelength of Fiber Bragg Grating FBG and the wavelength of OWDM separation vessel channel are combined; And utilize single light standard tool to realize through selecting different light standard tool acutance coefficient and Free Spectral Range, can realizing accurate mensuration to transducing signal to handling in real time respectively from each grating reflection light.The present invention has as the fiber Bragg grating sensor of light source or other Bragg grating sensing Signal Analysis Systems based on the interference of light that cost is low, real-time performance good and system is easy to expand and characteristics such as production than commonly used with tunable laser.
Description of drawings
Fig. 1 is a kind of synoptic diagram that comprises the sensing device of a Fiber Bragg Grating FBG;
Fig. 2 is the output spectrum synoptic diagram of a wideband light source;
Fig. 3 is the catoptrical spectrum diagram of Bragg grating;
Fig. 4 is the spectrum diagram of Bragg grating transmitted light;
Fig. 5 is the synoptic diagram of the OWDM separation vessel of band optical fiber pigtail;
Fig. 6 is the transmitted spectrum synoptic diagram of OWDM separation vessel;
Fig. 7 is the OWDM the expanded separation vessel synoptic diagram of band optical fiber pigtail;
Fig. 8 is the synoptic diagram of light standard tool;
Fig. 9 is the transmitted spectrum synoptic diagram of light standard tool;
Figure 10 is the transmitted spectrum synoptic diagram of the less light standard tool of Free Spectral Range;
Figure 11 is a synoptic diagram that comprises the distributed fiberoptic sensor of four Bragg gratings;
Figure 12 is that system of the present invention connects synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is done further detailed description.
Fig. 1 has provided a kind of synoptic diagram that comprises the sensing device 100 of a Fiber Bragg Grating FBG.This sensing device 100 comprises a light source 2, an optical loop device 4 and implants a Fiber Bragg Grating FBG 8 of optical fiber 6, and the light that light source 2 sends is through optical loop device 4 output light signals 5 and light signals 12, Fiber Bragg Grating FBG 8 output light signals 10.Fiber Bragg grating sensor is a kind of frequency of utilization Fibre Optical Sensor high, the most widest in area, and this sensor can change the wavelength of the light wave of its reflection according to the variation of environment temperature and/or strain.
Fig. 2 has provided the spectrum synoptic diagram of the light signal 12 of light source 2 outputs.Usually, for the single optical fiber Bragg grating, because wavelength variation range is in several nanometers, therefore, the output bandwidth Δ λ s of light source 2 also only needs several nanometers.But for the sensor-based system that in an optical fiber, comprises a plurality of Fiber Bragg Grating FBGs, the output bandwidth of light source 2 also will be done corresponding increase according to the increase of the quantity of Bragg grating.The grating cycle of Fiber Bragg Grating FBG 8 is Λ, when a branch of broad band light beam is transmitted to Fiber Bragg Grating FBG, only can reflect a kind of light wave of specific wavelength; This wavelength is called bragg wavelength; λ b=2n Λ, λ b is a bragg wavelength, n is the effective refractive index of fiber core 6.When the change of strain and temperature can influence effective optical index n of Fiber Bragg Grating FBG and grating periods lambda simultaneously, its result is exactly the change of grating bragg wavelength.
It is the reflected light narrow-band spectrum 14 of the Bragg grating of λ b that Fig. 3 has provided centre wavelength.
Fig. 4 has provided the spectrum 16 that sees through the light signal 10 of Fiber Bragg Grating FBG.
Based on above-mentioned characteristic, can in an optical fiber, implant a plurality of Bragg gratings.
Each is the operating wavelength range of fiber Bragg grating sensor independently, the quantity of the sensor that the spectral width of detectable total wavelength coverage of wavelength detecting and light source has determined on an independent optical fiber, can to articulate.In general; Can be more obvious because strain changes the wavelength shift that causes than the wavelength shift that temperature change causes; So generally can distribute the operating wavelength range of general 5 nanometers for the fiber Bragg grating sensor strain transducer, the fiber Bragg grating sensor temperature sensor then distributes the operating wavelength range of general 1 nanometer.Again because the common wavelength detecting test specification that can provide probably is 60 to 80 nanometers, so the number of sensors that articulates on optical fiber generally can not wait from 1 to 80.When selecting fiber Bragg grating sensor, need carefully select nominal wavelength and operating wavelength range to guarantee that each sensor all has its independently operation wavelength zone.The general optical fiber Bragg grating sensor can have the operating wavelength range of several nanometers, is several micromicrons even littler measurement so light transducing signal detecting device must be able to be accomplished resolution.
At first each ingredient of the present invention is described below:
Fig. 5 has provided the synoptic diagram of the OWDM separation vessel 102 of a band optical fiber pigtail.This OWDM separation vessel 102 comprises the reflector port 20 of the incident port one 8 of a band optical fiber pigtail, a band optical fiber pigtail, a collimating apparatus 22 and a multilayer dielectric film filter plate 24.Centre wavelength is that the incident light 17 of λ b gets into incident port one 8, after collimating apparatus 22, sees through filter plate 24 output light signals 26.Light from other wavelength of input end 17 input after filter plate 24 reflections, after collimating apparatus 22, is coupled to output in the output optical fibre 20.OWDM separation vessel 102 is elementary cells that constitute multichannel OWDM separation vessel.
Fig. 6 has provided the transmitted light frequency spectrum 28 of wave filter 24.The spectrum width of this transmitted light frequency spectrum 28 is Δ λ f, and for the fiber Bragg grating sensor that is used to measure temperature, Δ λ f is about 1 nanometer.For the fiber Bragg grating sensor that is used to measure strain, Δ λ f is about 5 nanometers.
Fig. 7 has provided the OWDM the expanded separation vessel synoptic diagram of a band optical fiber pigtail, and the OWDM the expanded separation vessel of this band optical fiber pigtail is the four channel OWDM separation vessels 112 of a 1x4.This four channels OWDM separation vessel 112 is made up of four single channel OWDM separation vessels 104,106,108 and 110; The central homology wavelength of each channel is respectively λ b4, λ b3, λ b2 and λ b1; The bandwidth of each channel can determine according to application need, but the frequency spectrum of each channel mutual superposition not.Comprise λ b4, λ b3, λ b2 and four channels of λ b1 in the incident light 30; After being coupled into the incident port 32 of OWDM separation vessel 112; Be separated into four collimated light beams 34,42,48 and 54; OWDM separation vessel 104,106,108 and 110 is coupled to output port 36,44,50 respectively and also is connected with next stage incident port successively with 56, and the output port 56 of OWDM separation vessel 110 is used for system extension.Because the OWDM separation vessel all has certain transmission and reflection to insert loss, the optical loss of four channels after separating is followed successively by λ b4, λ b3, λ b2 and λ b1 from small to large in the incident light 30.
Fig. 8 has provided the synoptic diagram of light standard tool 114.The thickness of this light standard tool 114 is h, and length is L, two logical light faces 59 and 60 be coated with multilayer dielectric film, reflectivity is R.Suppose that incident light 58 gets into the light standard tool with the incident angle near zero degree, the Free Spectral Range FSR of light standard tool 114 is shown Δ λ=λ with wavelength table
2/ (2nh), or use frequency representation to be Δ v=C/ (2nh).Acutance coefficient F (Finesse) is 4R/ (1-R)
2, R is a reflectivity, peak transmission wavelength X p is: 2nh/m, m are interference levels.Therefore, FSR is different to different wavelengths.The transmission spectrum 62 of light standard tool 114 is as shown in Figure 9.Through adjustment FSR and peak transmission wavelength X p; Can make λ b1, λ b2, λ b3, λ b4 be in mid point 64,66,68,70 places or the midpoint of negative edge of the rising edge of transmission spectrum 62 respectively, can change wavelength change into intensity variations like this.As can beappreciated from fig. 9, the acutance coefficient of light standard tool 114 directly influences sensitivity and the sensing range that wavelength detects, and the acutance coefficient is high more, and the sensitivity that wavelength detects is just high more, and sensing range is more little.Another sensitivity of method that increases the wavelength detection is that FSR is reduced one times; Shown in figure 10; Because the interval delta λ p of the peak transmission wavelength X p of etalon 114 is in about 100 nanometer range; Approximately equal so require the interval of λ b1, λ b2, λ b3 and λ b4 also approximate identical, can guarantee sensitivity and sensing range that each channel has approximately uniform wavelength to detect like this.The length L of light standard tool 114 mainly is to guarantee to receive all light signals from 112 outputs of OWDM separation vessel.
Figure 11 has provided the synoptic diagram that on an optical fiber, comprises the distributed fiberoptic sensor 118 of 4 Fiber Bragg Grating FBGs.Bragg grating 72,74,76 and grating cycle of 78 are respectively Λ 1, Λ 2, Λ 3 and Λ 4; Catoptrical bragg wavelength is respectively: λ b1, λ b2, λ b3 and λ b4.Distance between the Bragg grating 72,74,76 and 78 need not equate.Because the loss of optical fiber itself, catoptrical loss is followed successively by λ b1, λ b2, λ b3 and λ b4 from small to large.In remote Fibre Optical Sensor, the difference of this loss is just apparent in view.
In the face of constituting, total system of the present invention describes down:
Shown in figure 12, a kind of distributed sensing system 120 of extendible Fiber Bragg Grating FBG comprises that the optical loop device 84, one of the wideband light source 80 of a band optical fiber pigtail, three port band optical fiber pigtails comprise the OWDM the expanded separation vessel 112 of a plurality of fiber Bragg grating sensor with different grating cycles 118, a band optical fiber pigtail, light standard tool 114, four light transducing signal detecting devices 90,92,94 and 96 and signal processing system 98.
The output of wideband light source 80 is connected to the input port 82 of optical loop device 84; The transmission output port 86 of optical loop device 84 is connected to the input port 87 of fiber Bragg grating sensor 118; The reflection output port 88 of optical loop device 84 is connected to the input port 32 of OWDM separation vessel 118, the corresponding respectively reflected light from Bragg grating 78,76,74 and 72 of the output collimated light beam 34,42,48 of the output port of OWDM separation vessel 118 and 54.Owing to reason above-mentioned, behind the reflected light of each Bragg grating process OWDM separation vessel 112, the loss of light obtains certain balance.Collimated light beam 34,42,48 and 54 gets into light standard tool 114 with the incident angle near zero degree; After seeing through light standard tool 114; Receive light transducing signal 34,42,48 and 54 respectively by light transducing signal detecting device 90,92,94 and 96, and carry out real time signal processing by signal processing system 98.Though the sensor-based system to have four Bragg gratings is described, sensor-based system 120 has expanded function.If the quantity of Bragg grating in the increase optical fiber as long as increase the single channel OWDM separation vessel and the light transducing signal detecting device of equal number, can realize the expansion of system easily.As long as the spectral characteristic of the bragg wavelength of the Bragg grating that is increased and OWDM separation vessel satisfies above-mentioned requirement, the length L long enough of a light requirement etalon 114, and can receive all sense light signals, just need not to increase the light standard tool.
It is emphasized that; Embodiment of the present invention is illustrative; Rather than it is determinate; Therefore the present invention is not limited to the embodiment described in the embodiment, and every other embodiments that drawn by those skilled in the art's technical scheme according to the present invention belong to the scope that the present invention protects equally.
Claims (10)
1. scalable distributed sensor-based system based on Fiber Bragg Grating FBG is characterized in that: the optical loop device, that comprises the wideband light source of a band optical fiber pigtail, three port band optical fiber pigtails comprises a plurality of OWDM expanded separation vessels with the fiber Bragg grating sensor in different grating cycles, a band optical fiber pigtail, light standard tool and a plurality of smooth transducing signal detecting device and signal processing system; The output of the wideband light source of described band optical fiber pigtail is connected to the input port of the optical loop device of band optical fiber pigtail; The transmission output port of the optical loop device of described band optical fiber pigtail is connected to fiber Bragg grating sensor; The reflection output port of the optical loop device of this band optical fiber pigtail is connected to the input port of the OWDM the expanded separation vessel of band optical fiber pigtail; The output collimated light beam of the output port of the OWDM the expanded separation vessel of described band optical fiber pigtail to be getting into the light standard tool near the zero degree incident angle, described smooth transducing signal detecting device is arranged at and receives the light transducing signal that sees through from the light standard tool behind institute's light standard tool and carry out real time signal processing by signal processing system.
2. the scalable distributed sensor-based system based on Fiber Bragg Grating FBG according to claim 1, it is characterized in that: the width of the output spectrum of the wideband light source of described band optical fiber pigtail is greater than 10 nanometers.
3. the scalable distributed sensor-based system based on Fiber Bragg Grating FBG according to claim 1 is characterized in that: the optical loop device of described three port band optical fiber pigtails comprises the reflection output port of the transmission output port and a band optical fiber pigtail of the input port of a band optical fiber pigtail, a band optical fiber pigtail.
4. the scalable distributed sensor-based system based on Fiber Bragg Grating FBG according to claim 1; It is characterized in that: the OWDM the expanded separation vessel of described band optical fiber pigtail is connected and composed by a plurality of single channel OWDM separation vessels successively; The transmitted light spectral range of the output port of each single channel OWDM separation vessel is greater than 2 nanometers; The transmitted light spectral wavelength of adjacent two output ports is at interval about equally and greater than the transmitted light spectral range of each output port; This can expand center light wavelength and last Bragg grating that comprises a plurality of fiber Bragg grating sensors with different grating cycle identical of first output port of OWDM separation vessel, and this can expand center light wavelength and first Bragg grating that comprises a plurality of fiber Bragg grating sensors with different grating cycle identical of last output port of OWDM separation vessel.
5. the scalable distributed sensor-based system based on Fiber Bragg Grating FBG according to claim 1; It is characterized in that: described adjacent two the catoptrical wavelength intervals of Bragg grating that comprise a plurality of fiber Bragg grating sensors with different grating cycles are greater than 2 nanometers; The centre wavelength of the catoptrical reflectance spectrum of each Bragg grating is at interval near equating that this comprises a plurality of orderings with the fiber Bragg grating sensor in different grating cycles and is beneficial to the intensity of each sensor signal of balance at light transducing signal detecting device with the opposite ordering that can expand the OWDM separation vessel.
6. the scalable distributed sensor-based system based on Fiber Bragg Grating FBG according to claim 1; It is characterized in that: described light standard prodigiosin enough receives the output light of the OWDM the expanded separation vessel of all band optical fiber pigtails; The Free Spectral Range of this light standard tool is identical with adjacent two the catoptrical wavelength intervals of Bragg grating that comprise a plurality of fiber Bragg grating sensors with different grating cycle; The peak value of its transmitted light wavelength is greater than or less than the catoptrical centre wavelength of Bragg grating, and makes the catoptrical centre wavelength of Bragg grating be positioned near the center of rising or negative edge of transmitted light spectrum curve of light standard tool; The acutance coefficient of this light standard tool makes the catoptrical wavelength variation range of fiber Bragg grating sensor all be in the rising or negative edge of transmitted light spectrum curve of light standard tool.
7. the scalable distributed sensor-based system based on Fiber Bragg Grating FBG according to claim 1 is characterized in that: the spectral response range of described smooth transducing signal detecting device is identical with the catoptrical wavelength variation range of fiber Bragg grating sensor.
8. the scalable distributed sensor-based system based on Fiber Bragg Grating FBG according to claim 1 is characterized in that: described signal processing system is carried out real time signal processing to the input signal of each light transducing signal detecting device.
9. according to each described scalable distributed sensor-based system based on Fiber Bragg Grating FBG of claim 1 to 8, it is characterized in that: the optical fiber pigtail of each port of the optical loop device of the wideband light source of described band optical fiber pigtail, described three port band optical fiber pigtails, the described OWDM the expanded separation vessel that comprises a plurality of fiber Bragg grating sensors with different grating cycles and band optical fiber pigtail adopts the arc welding or the joints of optical fibre to be connected.
10. according to each described scalable distributed sensor-based system based on Fiber Bragg Grating FBG of claim 1 to 8, it is characterized in that: the single channel OWDM separation vessel quantity of the OWDM the expanded separation vessel of described band optical fiber pigtail, the Bragg grating sensor quantity and the light transducing signal detector number that comprise a plurality of fiber Bragg grating sensors with different grating cycles are identical.
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| CN104020627A (en) * | 2014-05-20 | 2014-09-03 | 武汉理工大学 | Wavelength demodulating device and method for fiber bragg grating sensor network |
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| CN105318898A (en) * | 2015-10-21 | 2016-02-10 | 武汉理工大学 | Identical weak reflection grating sensing network demodulation system and method based on frequency sweep light source |
| CN105987885A (en) * | 2016-01-06 | 2016-10-05 | 山东省科学院激光研究所 | Fiber grating-based quasi-distributed gas sensing system |
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| CN114502923A (en) * | 2019-08-14 | 2022-05-13 | 乐姆宝公开有限公司 | Method and system for interrogating a fiber bragg grating type fiber optic sensor using a tunable optical bandpass filter |
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| CN104020627A (en) * | 2014-05-20 | 2014-09-03 | 武汉理工大学 | Wavelength demodulating device and method for fiber bragg grating sensor network |
| CN104020627B (en) * | 2014-05-20 | 2016-08-24 | 武汉理工大学 | A kind of Wavelength demodulation apparatus and method of fiber bragg gratings sensing network |
| CN104848927A (en) * | 2015-05-21 | 2015-08-19 | 武汉理工大学 | Vibration detection system based on chirped grating sensing and wavelength division multiplexing technology |
| CN105318898A (en) * | 2015-10-21 | 2016-02-10 | 武汉理工大学 | Identical weak reflection grating sensing network demodulation system and method based on frequency sweep light source |
| CN105987885A (en) * | 2016-01-06 | 2016-10-05 | 山东省科学院激光研究所 | Fiber grating-based quasi-distributed gas sensing system |
| CN106168491B (en) * | 2016-07-18 | 2018-10-09 | 武汉理工光科股份有限公司 | Fiber-optic grating sensor measurement result positioning display method and system |
| CN106168491A (en) * | 2016-07-18 | 2016-11-30 | 武汉理工光科股份有限公司 | Fiber-optic grating sensor measurement result positioning display method and system |
| CN107796314A (en) * | 2016-09-02 | 2018-03-13 | 株式会社迪思科 | Measurement apparatus |
| CN107796314B (en) * | 2016-09-02 | 2021-03-05 | 株式会社迪思科 | Measuring device |
| CN106644157B (en) * | 2016-11-09 | 2022-03-11 | 苏州工业园区韵光电子科技有限公司 | Optical fiber temperature measurement system applied to power system |
| CN106644157A (en) * | 2016-11-09 | 2017-05-10 | 苏州工业园区韵光电子科技有限公司 | Novel optical fiber temperature measuring system for electric power system |
| CN111051843A (en) * | 2017-07-20 | 2020-04-21 | 英国电讯有限公司 | Optical fiber |
| US11274990B2 (en) | 2017-07-20 | 2022-03-15 | British Telecommunications Public Limited Company | Optical fiber |
| CN111051843B (en) * | 2017-07-20 | 2022-03-18 | 英国电讯有限公司 | Optical fiber |
| CN114502923A (en) * | 2019-08-14 | 2022-05-13 | 乐姆宝公开有限公司 | Method and system for interrogating a fiber bragg grating type fiber optic sensor using a tunable optical bandpass filter |
| CN113188600A (en) * | 2021-04-30 | 2021-07-30 | 西安航天动力研究所 | Long-distance distributed oil delivery pipe multi-parameter online measurement system |
| CN113288055A (en) * | 2021-05-20 | 2021-08-24 | 中国科学技术大学 | Distributed Raman fiber multi-target detection system |
| CN113310508A (en) * | 2021-05-27 | 2021-08-27 | 欧梯恩智能科技(苏州)有限公司 | Distributed measurement system and method based on light rays with different wavelengths |
| CN113517943A (en) * | 2021-05-27 | 2021-10-19 | 欧梯恩智能科技(苏州)有限公司 | Distributed measurement system and method based on space division wavelength division multiplexing |
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