CN206514976U - 1200 DEG C of distributed Brillouin light fiber sensors based on photonic crystal fiber - Google Patents
1200 DEG C of distributed Brillouin light fiber sensors based on photonic crystal fiber Download PDFInfo
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- CN206514976U CN206514976U CN201720166098.7U CN201720166098U CN206514976U CN 206514976 U CN206514976 U CN 206514976U CN 201720166098 U CN201720166098 U CN 201720166098U CN 206514976 U CN206514976 U CN 206514976U
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Abstract
The utility model is related to optical field, and in particular to a kind of 1200 DEG C of distributed Brillouin light fiber sensors based on photonic crystal fiber.The purpose of this utility model is can not to keep the stability of its waveguiding structure for a long time at 1200 DEG C to solve the optical fiber of fibre optical sensor, and the problem of limit the measurement temperature upper limit of high temperature optical fiber sensor.1200 DEG C of distributed Brillouin light fiber sensors based on photonic crystal fiber include：Optical fiber laser, photo-coupler, the first Polarization Controller, the first electrooptic modulator, arbitrary-function generator, scrambler, amplifier, first annular device, the second Polarization Controller, the second electrooptic modulator, microwave source, isolator, testing fiber, the second circulator, photodetector, data collecting card and wave filter, the utility model passes through high temperature brillouin gain spectrum, according to respective function relation, calculate measured temperature, it is adaptable to the measurement of 1200 DEG C of temperatures above.
Description
Technical field
The utility model is related to optical field, and in particular in a kind of 1200 DEG C of distributed cloth based on photonic crystal fiber
Deep fibre optical sensor.
Background technology
In distributed sensing technology, the Distributed Optical Fiber Sensing Techniques based on Brillouin scattering belong to emerging sensing prison
Survey technology, by the outstanding index that it is reached in temperature and strain measurement, in measurement accuracy, measurement range and space point
Other sensing technologies are above in resolution, the application on sensing direction is very popular, but optical fiber meets or exceeds certain in temperature
During one value, because the reasons, its waveguiding structure meeting such as crystallization occur at high temperature for the thermal diffusion campaign of Doped ions, or quartz
Destroyed, this feature limits the temperature upper limit of distributed fiberoptic sensor measurement.
The high temperature optical fiber sensor that researcher researches and develops both at home and abroad at present, although precision is higher, but maximum temperature is only
975 DEG C, and up to the present, how most of research improves in spatial resolution and temperature control if all being concentrated on, for
The research for extending temperature-measuring range is very rare, therefore develops the higher high temperature optical fiber sensor of measurement temperature with very heavy
The meaning wanted.
Utility model content
The purpose of this utility model is can not to keep its ripple for a long time at 1200 DEG C to solve the optical fiber of fibre optical sensor
The stability of guide structure, and the problem of limit the measurement temperature upper limit of high temperature optical fiber sensor.
The utility model adopts the technical scheme that to solve the above problems：The high temperature Brillouin for measuring photonic crystal fiber
Gain spectral, by high temperature brillouin gain spectrum, according to respective function relation, calculates measured temperature, to improve distributed high temperature
The measurement temperature upper limit of fibre optical sensor.
1200 DEG C of distributed Brillouin light fiber sensors based on photonic crystal fiber, including：Optical fiber laser, light
Coupler, the first electrooptic modulator, arbitrary-function generator, scrambler, amplifier, first annular device, the second electrooptic modulator,
Microwave source, isolator, testing fiber, the second circulator, photodetector, data collecting card and wave filter；
The output end of the optical fiber laser connects the input of photo-coupler, and the output end of the photo-coupler connects respectively
Connect the input of the first electrooptic modulator and the second electrooptic modulator；
The output end of first electrooptic modulator connects the input of scrambler, and the output end connection of the scrambler is put
The input of big device, the output end of the amplifier connects first annular device；
The input of first electrooptic modulator is also connected with arbitrary-function generator；
The output end of second electrooptic modulator connects the input of isolator, and the output end connection of the isolator is treated
The fine one end of light-metering, the other end of the testing fiber is sequentially connected first annular device, the second circulator, second circulator
Single port connect photodetector input, the photodetector output end connection data collecting card, described second
The another port of circulator connects the input of wave filter；
The input of the electrooptic modulator is also connected with microwave source.
Further, the way of output of the laser is polarization maintaining optical fibre output.
Further, the coupling ratio of the photo-coupler is 95:5 and 80:Between 20.
Further, the wave filter is fiber grating filter.
Further, 1200 DEG C of distributed Brillouin light fiber sensors based on photonic crystal fiber also include first
Polarization Controller and the second Polarization Controller, the output end of the coupler connect the first Polarization Controller and the second polarization respectively
Controller, the output end of first Polarization Controller connects the input of the first electrooptic modulator, second Polarization Control
The output end of device connects the input of the second electrooptic modulator.
Beneficial effect：The utility model microwave source carries out frequency sweep to detection light single order sideband, by number under different frequency
The data collected according to capture card are analyzed and are fitted, and obtain the Brillouin shift of optical fiber in stove, draw Brillouin shift and
The functional relation of temperature, by the Brillouin shift of testing fiber, according to functional relation, is converted into temperature, so as to improve distribution
The measurement temperature upper limit of formula Brillouin light fiber sensor.
Brief description of the drawings
Fig. 1 is a kind of overall structure diagram of embodiment of utility model；
Fig. 2 is the overall structure diagram of another embodiment of the present utility model；
In figure：1 optical fiber laser, 2 photo-couplers, 3 first Polarization Controllers, 4 first electrooptic modulators, 5 arbitrary functions
Generator, 6 scramblers, 7 amplifiers, 8 first annular devices, 9 second Polarization Controllers, 10 second electrooptic modulators, 11 microwaves
Source, 12 isolators, 13 testing fibers, 14 second circulators, 15 photodetectors, 16 data collecting cards, 17 wave filters.
Embodiment
Embodiment one：With reference to Fig. 1 illustrate present embodiment, present embodiment based on photonic crystal fiber
1200 DEG C of distributed Brillouin fiber optic sensor constructions as shown in figure 1, including：Including：Optical fiber laser 1, photo-coupler 2,
It is one electrooptic modulator 4, arbitrary-function generator 5, scrambler 6, amplifier 7, first annular device 8, the second electrooptic modulator 10, micro-
Wave source 11, isolator 12, testing fiber 13, the second circulator 14, photodetector 15, data collecting card 16 and wave filter 17；
The output end of the optical fiber laser 1 connects the input of photo-coupler 2, the output end point of the photo-coupler 2
The input of the first electrooptic modulator 4 and the second electrooptic modulator 10 is not connected；
The output end of first electrooptic modulator 4 connects the input of scrambler 6, and the output end of the scrambler 6 connects
The input of amplifier 7 is connect, the output end of the amplifier 7 connects first annular device 8；
The input of first electrooptic modulator 4 is also connected with arbitrary-function generator 5；
The output end of second electrooptic modulator 10 connects the input of isolator 12, the output end of the isolator 12
One end of testing fiber 13 is connected, the other end of the testing fiber 13 is sequentially connected first annular device 8, the second circulator 14,
The Single port of second circulator 14 connects the input of photodetector 15, the output end connection of the photodetector 15
Data collecting card 16, the another port of second circulator 14 connects the input of wave filter 17；
The input of the electrooptic modulator 10 is also connected with microwave source 11.
Operation principle：
The wavelength light beam that optical fiber laser 1 is launched near 1550nm, by photo-coupler, 2 points are 50/50 two-beam,
Light beam is as pump light, and another light beam passes through the first electrooptic modulator 4, arbitrary-function generator 5 as detection light, pump light
Produce electric pulse to be carried on the first electrooptic modulator 4, continuous light modulation is washed off into arteries and veins 10ns, then by scrambler 6, make pump
Pu polarization state in all directions uniform, then be amplified pulsed optical signals by amplifier 7, the pulsed light after amplification
Signal is injected into photonic crystal fiber by first annular device 8；Detect light and pass through the second electrooptic modulator 10, pass through microwave
Source 11 is carried on electrooptic modulator, makes single order sideband above and below its generation, then by isolator 12, by first annular device 8, then
3 ports are entered by 2 ports of the second circulator 14, the upper side band and fundamental frequency of detection light are filtered out by wave filter 17, under
Sideband light can carry out digital-to-analogue conversion by photodetector 15, collected finally by data collecting card 16, then place the fiber in
In high temperature furnace, maximum operating temperature is 1350 DEG C, and high temperature furnace is heated up, and often changes a temperature, just by temperature in stove
Control is constant, and 11 pairs of detection light single order sidebands of control microwave source carry out frequency sweep, by being adopted to data collecting card under different frequency 16
The data collected are analyzed and are fitted, it is possible to obtained the Brillouin shift of optical fiber in stove, drawn Brillouin shift and temperature
Functional relation.
Embodiment two：Present embodiment is further limited on the basis of embodiment one, the laser
Device 1 is polarization maintaining optical fibre output.
Embodiment three：Present embodiment is further limited on the basis of embodiment one, the optical fiber
The coupling ratio of coupler 2 is 95:5 and 80:Between 20,
Embodiment four：Present embodiment is further limited on the basis of embodiment one, the filtering
Device 13 is fiber grating filter, filters out stokes light.
Embodiment five：Illustrate present embodiment, the difference of present embodiment and embodiment one with reference to Fig. 1
It is, as shown in Fig. 2 the distributed Brillouin fiber optic sensor construction in 1200 based on photonic crystal fiber DEG C of the present embodiment is also
Including the first Polarization Controller 3 and the second Polarization Controller 9, the output end of the photo-coupler 2 connects the first polarization control respectively
The Polarization Controller 9 of device 3 and second processed, the output end of first Polarization Controller 3 connects the input of the first electrooptic modulator 4
End, the output end of second Polarization Controller 9 connects the input of the second electrooptic modulator (10).
Claims (5)
1. 1200 DEG C of distributed Brillouin light fiber sensors based on photonic crystal fiber, it is characterised in that including：Optical-fiber laser
Device (1), photo-coupler (2), the first electrooptic modulator (4), arbitrary-function generator (5), scrambler (6), amplifier (7),
One circulator (8), the second electrooptic modulator (10), microwave source (11), isolator (12), testing fiber (13), the second circulator
(14), photodetector (15), data collecting card (16) and wave filter (17)；
The input of the output end connection photo-coupler (2) of the optical fiber laser (1), the output end of the photo-coupler (2)
The input of the first electrooptic modulator (4) and the second electrooptic modulator (10) is connected respectively；
The input of the output end connection scrambler (6) of first electrooptic modulator (4), the output end of the scrambler (6)
The input of amplifier (7) is connected, the output end of the amplifier (7) connects first annular device (8)；
The input of first electrooptic modulator (4) is also connected with arbitrary-function generator (5)；
The input of the output end connection isolator (12) of second electrooptic modulator (10), the output of the isolator (12)
One end of end connection testing fiber (13), the other end of the testing fiber (13) is sequentially connected first annular device (8), the second ring
Shape device (14), the input of the Single port connection photodetector (15) of second circulator (14), the photodetector
(15) output end connection data collecting card (16), the another port of second circulator (14) connects the defeated of wave filter (17)
Enter end；
The input of the electrooptic modulator (10) is also connected with microwave source (11).
2. the distributed Brillouin light fiber sensor of 1200 DEG C according to claim 1 based on photonic crystal fiber, its feature
It is, the way of output of the laser (1) is polarization maintaining optical fibre output.
3. the distributed Brillouin light fiber sensor of 1200 DEG C according to claim 1 based on photonic crystal fiber, its feature
It is, the coupling ratio of the photo-coupler (2) is 95:5 and 80:Between 20.
4. the distributed Brillouin light fiber sensor of 1200 DEG C according to claim 1 based on photonic crystal fiber, its feature
It is, the wave filter (13) is fiber grating filter.
5. the distributed Brillouin light fiber sensor of 1200 DEG C according to claim 1 based on photonic crystal fiber, its feature
It is, in addition to the first Polarization Controller (3) and the second Polarization Controller (9), the output end of the photo-coupler (2) connects respectively
Connect the first Polarization Controller (3) and the second Polarization Controller (9), the output end connection first of first Polarization Controller (3)
The input of electrooptic modulator (4), the output end of second Polarization Controller (9) connects the defeated of the second electrooptic modulator (10)
Enter end.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607220A (en) * | 2017-09-25 | 2018-01-19 | 兰州理工大学 | A kind of fast optical pulse broadening temperature sensing method of photonic crystal fiber and sensor based on liquid filling |
| CN107860488A (en) * | 2017-09-25 | 2018-03-30 | 兰州理工大学 | A kind of fast light time advance temperature sensing method of photonic crystal fiber and sensor based on liquid filling |
| CN113959582A (en) * | 2021-10-27 | 2022-01-21 | 南京信息工程大学 | Temperature sensing measurement method of mirror image type one-dimensional photonic crystal model |
-
2017
- 2017-02-23 CN CN201720166098.7U patent/CN206514976U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607220A (en) * | 2017-09-25 | 2018-01-19 | 兰州理工大学 | A kind of fast optical pulse broadening temperature sensing method of photonic crystal fiber and sensor based on liquid filling |
| CN107860488A (en) * | 2017-09-25 | 2018-03-30 | 兰州理工大学 | A kind of fast light time advance temperature sensing method of photonic crystal fiber and sensor based on liquid filling |
| CN107607220B (en) * | 2017-09-25 | 2021-01-12 | 兰州理工大学 | Photonic crystal fiber fast light pulse broadening temperature sensing method and sensor based on liquid filling |
| CN107860488B (en) * | 2017-09-25 | 2021-06-25 | 兰州理工大学 | Photonic crystal fiber fast light time advanced temperature sensing method and sensor based on liquid filling |
| CN113959582A (en) * | 2021-10-27 | 2022-01-21 | 南京信息工程大学 | Temperature sensing measurement method of mirror image type one-dimensional photonic crystal model |
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