CN104613889B - A kind of crooked sensory measuring system based on optical fiber ring laser - Google Patents
A kind of crooked sensory measuring system based on optical fiber ring laser Download PDFInfo
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Abstract
The invention provides a kind of crooked sensory measuring system based on optical fiber ring laser, it is characterised in that：One section of thin-core fibers is fused in the optical fiber ring laser resonator being made up of pump laser, wavelength division multiplexer, Er-doped fiber, optoisolator, 1*2 types fiber coupler and Polarization Controller.On the one hand thin-core fibers play a part of crooked sensory, on the other hand as optical filter.Using when, thin-core fibers are adhered into object under test surface, utilize fiber spectrometer measure optical fiber ring laser output laser center wavelength, you can determine object under test degree of crook.The present invention using laserresonator modeling characteristic, with detectable signal is strong, signal to noise ratio is high, line width, high sensitivity and the characteristics of temperature-insensitive, can be applied in all kinds of Practical Projects.
Description
Technical field
The invention provides a kind of crooked sensory measuring system based on optical fiber ring laser, belong to optical fiber sensing technology
Field.
Background technology
Optical fibre bending sensor is than traditional bend sensor, with anti-electromagnetic interference capability is strong, corrosion-resistant, quality
Gently, small volume and it is easy to long-range monitoring and other advantages, subgrade settlement and rail available for the Bending Deformation, road of monitoring bridge
Flexural deformation in road etc., it can also be used to monitor flexural deformation of some high-precision instrument and equipment and Important building structures etc., have
And be widely applied.
Existing optical fibre bending sensor mainly includes two kinds：Intensity modulation type and wavelength modulation type.The former, to light source
Light stability requires higher, generally need to be by the way of reference path come the influence of compensatory light destabilizing factor, and this must
So add the complexity of system；Change of the latter by detecting specific output optical wavelength demodulates the degree of crook of object under test,
The requirement to light source intensity stability is reduced, with measuring system stabilization, reproducible advantage.Further, current wavelength
Modulation type optical fibre bending sensor mainly has grating type optical fiber and fibre optic interferometer type.Fiber-optic grating sensor is based on Bradley lattice wave
Personal attendant's testee degree of crook and drift about, with larger measurement range, be widely used in the health detection of structure.But
It is that the preparation of fiber grating need to use Ultra-Violet Laser expensive in load hydrogen optical fiber inscription technology, its equipment complexity, and Bradley lattice wave
Long drift is easily influenceed by environment temperature, so as to bring error to measurement.Fibre optic interferometer type bend sensor, including horse
Conspicuous-Zehnder interferometer, Michelson steller interferometer and Fabry-Perot interferometer etc., with compact conformation, to prepare simple, cost low
Advantage, as the focus studied recently.Using the constructive or destructive interferences of light, by measuring in output light spectrum in resonance peak
The change of cardiac wave length is so that it is determined that the degree of crook of testee.Because they are usually using wideband light source, therefore detectable signal,
Specific resonance peak i.e. in output spectrum, corresponding light intensity is very weak.On the other hand, interferometer output interference spectrum contrast compared with
It is low, usually 3-20dB, and the three dB bandwidth (FWHM) of resonance peak is larger, about several nanometers to several tens of nanometers, so that it is difficult to exactly
The centre wavelength of resonance peak is determined, causes testee degree of crook measurement error larger.Meanwhile, these fibre optic interferometers are often
More sensitive to environment temperature, this also increases the error of flexural measurement to a certain extent.
The fibre optic interferometer of one single mode-thin core-single mode structure is connected to the resonator light path of optical fiber ring laser
In, constitute a crooked sensory measuring system based on optical fiber ring laser.On the one hand the fibre optic interferometer plays bending and passes
The effect of sense, on the one hand as optical filter, so that the modulation of the centre wavelength of laser output laser by bending.It is logical
The degree of crook of testee can be obtained by crossing the centre wavelength of measurement laser output laser.Laser output laser has light
Powerful, super-narrow line width characteristic, guarantee is provided for the accurate determination of its centre wavelength.On the other hand, due to single mode-thin core-
The fibre optic interferometer length of single mode structure be much smaller than laserresonator length, therefore the crooked sensory measuring system hardly by
The influence of fibre optic interferometer temperature, has the advantages that temperature-insensitive.
The content of the invention
It is an object of the invention to provide a kind of crooked sensory measuring system based on optical fiber ring laser, overcome existing
Optical fibre bending sensor exist detectable signal is weak, bandwidth is larger, and shortcoming easily influenced by ambient temperature passes through measurement output
The centre wavelength of laser, so as to obtain the degree of crook of testee exactly.The system has that detectable signal is strong, signal to noise ratio
The characteristics of height, line width, high sensitivity and temperature-insensitive.
The present invention is achieved through the following technical solutions：
A kind of crooked sensory measuring system based on optical fiber ring laser, it is characterised in that：The system is by pumping laser
Device (1), wavelength division multiplexer (2), Er-doped fiber (3), optoisolator (4), 1*2 types fiber coupler (5), thin-core fibers (6), light
Optical fiber spectrograph (7), Polarization Controller (8) and connection optical fiber (9) composition.Wherein, two ports on wavelength division multiplexer (2) one side point
It is not connected through connecting optical fiber (9) with pump laser (1) and Er-doped fiber (3), one of wavelength division multiplexer (2) another side
Port is connected through connecting optical fiber (9) with one end of Polarization Controller (8)；The other end of Er-doped fiber (3) and optoisolator (4)
One end be connected, the other end of optoisolator (4) is through connecting the separate end phase of optical fiber (9) and 1*2 types fiber coupler (5)
Connect, and two ports of the another side of 1*2 types fiber optic splitter (5) are respectively through connecting optical fiber (9) and thin-core fibers (6) and optical fiber
Spectrometer (7) is connected；The other end of thin-core fibers (6) is connected through connecting optical fiber (9) with the other end of Polarization Controller (8).
A kind of described crooked sensory measuring system based on optical fiber ring laser, it is characterised in that：Pump laser
(1) output wavelength can be 980nm and 1480nm, and correspondence wavelength division multiplexer (2) can use 980/1550nm and 1480/1550nm
Type optical fibre wavelength division multiplexer；The length of Er-doped fiber (3) is 1-10m.
A kind of described crooked sensory measuring system based on optical fiber ring laser, it is characterised in that：Optoisolator (4)
For 1550nm fiber optic isolators.
A kind of described crooked sensory measuring system based on optical fiber ring laser, it is characterised in that：1*2 type optical fiber couplings
Less one end of light splitting ratio of clutch (5) through connect optical fiber (9) be connected with fiber spectrometer (7), its light splitting ratio greatly one
End is connected through connecting optical fiber (9) with thin-core fibers (6).
A kind of described crooked sensory measuring system based on optical fiber ring laser, it is characterised in that：Thin-core fibers (6)
Core diameter be 2-4 μm, length is 5-200mm；Connecting optical fiber (9) can be using G.652, G.653 and G.655 single-mode fiber.
The present invention operation principle be：Referring to accompanying drawing 1, wavelength division multiplexer (2), Er-doped fiber (3), optoisolator (4), 1*
2 type fiber couplers (5), thin-core fibers (6), Polarization Controller (8) and some connection optical fiber (9) constitute optical fiber ring laser
Resonator.Intracavitary Er-doped fiber (3) serves as working-laser material, and isolator (4) only allows intracavitary light to transmit in one direction,
Less one end of splitting ratio of 1*2 type fiber couplers as laser output end.The laser warp of pump laser (1) output
Wavelength division multiplexer (2) is coupled into laserresonator, and pumping laser operation material (3) produces C-band laser.Thin-core fibers (6) with
The connected connection optical fiber (9) in two ends constitutes the fibre optic interferometer of single mode-thin core-single mode structure.So that fiber ring laser
The modulation of the centre wavelength of device output laser by bending.The centre wavelength of laser is exported by measuring laser can obtain tested
The degree of crook of object.
The beneficial effects of the invention are as follows：The fibre optic interferometer of one single mode-thin core-single mode structure is connected to fiber annular
In the resonator light path of laser, a crooked sensory measuring system based on optical fiber ring laser is constituted.The fiber optic interferometric
On the one hand instrument plays a part of crooked sensory, on the one hand as optical filter, so that laser exports the center of laser
The modulation of wavelength by bending.The centre wavelength of laser is exported by measuring laser can obtain the degree of crook of testee.
Laser output laser has light intensity big and super-narrow line width characteristic, is conducive to the Accurate Determining of its centre wavelength, is accurate
The degree of crook for measuring testee provides guarantee.On the other hand, due to the fibre optic interferometer of single mode-thin core-single mode structure
Length is much smaller than the length of laserresonator, therefore the crooked sensory measuring system is hardly by the shadow of fibre optic interferometer temperature
Ring, i.e., the crooked sensory measuring system has the advantages that temperature-insensitive.
Brief description of the drawings
Fig. 1 is the crooked sensory measuring system schematic diagram based on optical fiber ring laser of the present invention；
Fig. 2 is typical case's output laser light spectrogram of the present invention；
Fig. 3 is the output laser light spectrogram of the differently curved degree of the present invention；
Fig. 4 is the output laser center wavelength figure of the differently curved degree of the present invention.
Fig. 5 is the output laser light spectrogram of the different temperatures of the present invention.
Fig. 6 is the output laser center wavelength figure of the different temperatures of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described：
Referring to accompanying drawing 1, a kind of crooked sensory measuring system based on optical fiber ring laser, by pump laser (1), ripple
Division multiplexer (2), Er-doped fiber (3), optoisolator (4), 1*2 types fiber coupler (5), thin-core fibers (6), fiber spectrometer
(7), Polarization Controller (8) and connection optical fiber (9) composition.Wherein, two ports on wavelength division multiplexer (2) one side are respectively through connection
Optical fiber (9) is connected with pump laser (1) and Er-doped fiber (3), and a port of wavelength division multiplexer (2) another side is through even
One end that optical fiber (9) is connect with Polarization Controller (8) is connected；One end phase of the other end of Er-doped fiber (3) and optoisolator (4)
Connection, the other end of optoisolator (4) is connected through connecting optical fiber (9) with the separate end of 1*2 types fiber coupler (5), and 1*2 types
Two ports of the another side of fiber optic splitter (5) are respectively through connecting optical fiber (9) and thin-core fibers (6) and fiber spectrometer (7)
It is connected；The other end of thin-core fibers (6) is connected through connecting optical fiber (9) with the other end of Polarization Controller (8).
The output wavelength of pump laser (1) can be 980nm and 1480nm, and correspondence wavelength division multiplexer (2) can use 980/
1550nm and 1480/1550nm type optical fibre wavelength division multiplexers.The length of Er-doped fiber (3) is 1-10m.Optoisolator (4) is
1550nm fiber optic isolators, it is ensured that light is propagated in one direction.The less one end warp of light splitting ratio of 1*2 type fiber couplers
Connection optical fiber (9) is connected with fiber spectrometer (7), and the big one end of its light splitting ratio is through connecting optical fiber (9) and thin-core fibers (6) phase
Even.The core diameter of thin-core fibers (6) is 2-4 μm, and length is 5-200mm.All connection optical fiber (9) can using G.652,
G.653 and G.655 single-mode fiber.
In use, thin-core fibers (6) are pasted on into testee surface, the light of fiber spectrometer (7) measurement output laser
Spectrum.Fig. 2 is that the thin-core fibers that length is 20mm are pasted on typical case's output laser light spectrogram that test steel ruler surface is obtained.From figure
As can be seen that the central wavelength light intensity of output laser is about 0.61dBm, its optical s/n ratio about 63dB, correspondence 3dB line widths
(FWHM) it is about 0.01nm.Have detectable signal strong than traditional fibre optic interferometer bend sensor, signal to noise ratio is high, line width
Advantage.
Fig. 3 and Fig. 4 are that system output laser light spectrogram and output swash when thin-core fibers (6) are in differently curved degree respectively
Center wavelength of light figure.C corresponds to transverse axis curvature in Fig. 4 in Fig. 3, is defined as the inverse of bending radius, unit is m-1.Can
To find out, with the increase of testee degree of crook, to shortwave length direction obvious drift occurs for the centre wavelength for exporting laser,
I.e. output laser center wavelength is very sensitive to bending.By determine the system export laser centre wavelength can determine that it is tested
The degree of crook of object.
Fig. 5 and Fig. 6 are system output laser light spectrogram and output laser center ripple when thin-core fibers (6) are in different temperatures
Long figure.Understand, the temperature of thin-core fibers (6) is changed to during 100 DEG C from 25 DEG C, the centre wavelength of system output laser is
1563.120 ± 0.015nm, that is, exporting laser center wavelength has temperature-insensitive characteristic.
It can be seen from Fig. 2-6 experimental result, the crooked sensory measuring system of the invention based on optical fiber ring laser, tool
Have that detectable signal is strong, signal to noise ratio is high, line width, high sensitivity and the characteristics of temperature-insensitive, laser is exported by measurement system
Centre wavelength be the degree of crook that can determine that testee.
It should be pointed out that embodiment described above can make those skilled in the art that this hair is more fully understood
It is bright, but do not limit the invention in any way.Therefore, although this specification has been carried out in detail with embodiment to the present invention referring to the drawings
Thin explanation, it will be understood by those skilled in the art, however, that still can be modified to the present invention or equivalent substitution, always
It, all technical schemes for not departing from the spirit and scope of the invention and its improvement, it all should cover in the invention
Within the protection domain of patent.
Claims (4)
1. a kind of crooked sensory measuring system based on optical fiber ring laser, the system is by pump laser (1), wavelength-division multiplex
Device (2), Er-doped fiber (3), optoisolator (4), 1*2 types fiber coupler (5), thin-core fibers (6), fiber spectrometer (7), partially
Shake controller (8) and connection optical fiber (9) composition；Wherein, two ports on wavelength division multiplexer (2) one side are respectively through connecting optical fiber
(9) it is connected with pump laser (1) and Er-doped fiber (3), a port of wavelength division multiplexer (2) another side is through connecting light
Fine (9) are connected with one end of Polarization Controller (8)；The other end of Er-doped fiber (3) is connected with one end of optoisolator (4)
Connect, the other end of optoisolator (4) is connected through connecting optical fiber (9) with the separate end of 1*2 types fiber coupler (5), and its feature exists
In：Less one end of light splitting ratio of 1*2 types fiber coupler (5) is connected through connecting optical fiber (9) with fiber spectrometer (7), its
The big one end of light splitting ratio is connected through connecting optical fiber (9) with thin-core fibers (6)；The other end of thin-core fibers (6) is through connecting optical fiber
(9) other end with Polarization Controller (8) is connected；The core diameter of described thin-core fibers (6) is 2-4 μm, and length is 5-
200mm。
2. a kind of crooked sensory measuring system based on optical fiber ring laser according to claim 1, it is characterised in that：
The output wavelength of pump laser (1) can be 980nm and 1480nm, correspondence wavelength division multiplexer (2) can using 980/1550nm and
1480/1550nm type optical fibre wavelength division multiplexers.
3. a kind of crooked sensory measuring system based on optical fiber ring laser according to claim 1, it is characterised in that：
Optoisolator (4) is 1550nm fiber optic isolators.
4. a kind of crooked sensory measuring system based on optical fiber ring laser according to claim 1, it is characterised in that：
Connecting optical fiber (9) can be using G.652, G.653 and G.655 single-mode fiber, and the length of Er-doped fiber (3) is 1-10m.
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| CN105758328B (en) * | 2016-05-17 | 2018-04-06 | 安徽师范大学 | A kind of Dynamic Optical Fiber strain sensing device for straining magnitude of receiving |
| CN106197305A (en) * | 2016-08-09 | 2016-12-07 | 黄石晨信光电股份有限公司 | A kind of Mach-Zehnder interference type all-fiber crooked sensory device |
| CN108007377A (en) * | 2017-12-27 | 2018-05-08 | 北京信息科技大学 | One kind is based on thin-core fibers laser strain measurement system and its test method |
| CN107907070A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of strain measurement system based on MZ filter structure optical fiber lasers |
| JP6880513B2 (en) * | 2018-03-13 | 2021-06-02 | オムロン株式会社 | Optical measuring device and optical measuring method |
| CN109698719A (en) * | 2019-02-24 | 2019-04-30 | 苏州工业园区新国大研究院 | A kind of optical signal to noise ratio detection method based on multimode fibre interferometer |
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| JP2002131022A (en) * | 2000-10-23 | 2002-05-09 | Oki Electric Ind Co Ltd | Optical fiber sensing system and measuring method for wavelength of laser light |
| CN101852655B (en) * | 2010-04-13 | 2012-04-18 | 中国计量学院 | Distributed fiber Raman/Brillouin scattering sensor |
| CN103364106B (en) * | 2013-07-16 | 2015-07-29 | 扬州森斯光电科技有限公司 | A kind of Brillouin optical time domain analysis sensor-based system based on the pumping of overlength loop laser |
| CN103389477B (en) * | 2013-07-19 | 2015-09-09 | 北京信息科技大学 | A kind of method utilizing short cavity fiber laser to measure the magnetic induction density in magnetic field |
| CN103852092B (en) * | 2013-12-19 | 2017-05-24 | 哈尔滨工业大学（威海） | Mode interference annular cavity optical fiber laser sensor |
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