CN109917169A - A kind of light vortex fibre optic current sensor based on single seam detection - Google Patents
A kind of light vortex fibre optic current sensor based on single seam detection Download PDFInfo
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Abstract
Light vortex fibre optic current sensor proposed by the present invention based on single seam detection, including linearly polarized laser device, single mode optical fiber, Polarization Controller, light vortex optical fiber, fiber grating, line checking bias slice, single seam diaphragm and optical detector.Fiber grating is realized excites complex light swirl pattern in light vortex fiber annular core, warp checking bias slice can form bivalve light distribution, apply current field on the light vortex optical fiber after fiber grating, based on Faraday magnetooptical effect, phase difference is generated between complex light swirl pattern, delivery flap shaped laser spot will rotate, it will be changed by single light intensity for stitching diaphragm, light intensity variable quantity is directly proportional to size of current, the size of applied electric current can be measured according to light intensity variation, suitable single slit width degree is chosen than this parameter by single slit width degree and spot diameter, reach sensing sensitivity optimal.The fibre optic current sensor has the characteristics that high sensitivity, structure are simple, are easy to functionization etc., has important application value in field of current measurement.
Description
Technical field
The present invention relates to sensory field of optic fibre, in particular to a kind of light vortex fiber-optic current sensor based on single seam detection
Device.
Background technique
Fibre optic current sensor has important application in the power system, because of its natural insulation, strong antijamming capability,
Small in size, phenomena such as light-weight, measurement dynamic range is big, and there is no magnetic saturation is always to study both at home and abroad and the hot spot of application.
In recent years, light, which is vortexed, increasingly obtains everybody extensive concern as a kind of light beam of special construction, in optical multiplexer communication, light
The fields such as micro- manipulation, super-resolution optical detection are learned to be widely used.Light vortex beams are distributed with helical phase, with it
Polarisation distribution characteristic, which is combined, has obtained new application in current field detection field.Typical research report has Chinese science and technology big
S.Shi et al. is proposed under different magnetic field strengths, is passed through Rb atomic vapour with the complex light vortex beams in space, is passed through
The detection of current field may be implemented in the rotation of delivery flap shaped laser spot.But this method must be under Rb atom heating condition
It is able to achieve, limits the practicality (bibliography: S. Shi, D.-S. Ding, Z.-Y. Zhou, Y. Li, W.
Zhang, and B.-S. Shi, "Magnetic-field-induced rotation of light with orbital
Angular momentum, " Appl. Phy. Lett., vol. 106, no. 26, pp. 261110,2015.).It
Shanghai University S.Yu etc. proposes to pass through Bi with multiplexed optical vortex beams afterwards4Ge3O12(BGO) magneto-optical crystal carries out current field
Measurement, but this method is with being also based on space optics, the influence vulnerable to external disturbance.(bibliography: S. Yu,
F. Pang, H. Liu, X. Li, J. Yang, and T. Wang, "Compositing orbital angular
momentum beams in Bi4Ge3O12 crystal for magnetic field sensing," Appl. Phy.
Lett., 111 vol., no. 9, pp. 091107,2017).It is answered in view of spatial light vortex beams in current field detection
With the problem of, Shanghai University Pang stroke it is winged et al. propose a kind of complex light vortex fibre optic current sensor based on optical fiber, pass through
Polarization beam splitting, dislocation welding method excite complex light swirl pattern in a fiber, and output uses infrared CCD and revolves to petaloid hot spot
Turn to be observed, program main problem complex light is vortexed, and excitation device is complicated, and infrared detector is at high cost, and detects hot spot
Rotation parameter sensitivity it is low (bibliography: Pang strokes winged light swirl pattern all-fiber current sensor: China,
CN201711426275.1 [P] 2017-12-26).
Summary of the invention
It is an object of the invention to solve existing optical fiber light swirl pattern current sensor detection technique problem, one is proposed
Light vortex fibre optic current sensor of the kind based on list seam detection stitches diaphragm with list using line checking bias slice and combines realization light vortex method
Draw the detection of magneto-optic effect, have many advantages, such as highly sensitive, detection structure is simple, it is highly reliable, be easy to functionization.
In order to achieve the above objectives, insight of the invention is that
When extraneous curent change causes changes of magnetic field to act on light vortex optical fiber, be based on Faraday magnetooptical effect, have it is left,
Phase difference can be generated between the complex light swirl pattern of right-hand circular polarization state, detects this variation in order to facilitate practical,
Fiber-optic output placed a line checking bias slice and single seam diaphragm, directly proportional to phase difference through the light intensity of single seam diaphragm, therefore,
The size of applied electric current can be measured according to light intensity variation.Obtain this completely new optical fiber light vortex electricity based on single seam detection
Flow sensor have many advantages, such as detection is reliable, high sensitivity, performance are stable, it is at low cost etc. just, have extensively in field of current measurement
Application prospect.
Conceived according to foregoing invention, the present invention adopts the following technical solutions:
A kind of light vortex fibre optic current sensor based on single seam detection, including linearly polarized laser device, single mode optical fiber, Polarization Control
Device, light vortex optical fiber, fiber grating, line checking bias slice, single seam diaphragm and optical detector.The line that the linearly polarized laser device issues is inclined
Light shake by single mode optical fiber and after Polarization Controller, carries out welding with light vortex optical fiber, light is in light vortex optical fiber intermediate core
The excitation of complex light swirl pattern is realized in transmission by fiber grating, and complex light swirl pattern is in light vortex fiber annular core
Transmission, ring-shaped light spot is presented in light vortex optical fiber output in complex light swirl pattern, and after line checking bias slice, petaloid hot spot is presented,
Later by single diaphragm that stitches to hot spot progress space filtering, and optical detector is utilized to carry out light intensity detection.After fiber grating
Light vortex optical fiber on apply current field effect, be based on Faraday magnetooptical effect, the complex light whirlpool transmitted in light vortex optical fiber
Phase difference is generated between rotation mode, will be rotated from line checking bias slice delivery flap shaped laser spot, will be become by single light intensity for stitching diaphragm
Change, light intensity variable quantity is directly proportional to size of current, therefore, the size of applied electric current can be measured according to light intensity variation.
The working principle of the invention
The present invention carries out polarization selection filtering using complex light vortex hot spot of the line checking bias slice to sense light vortex optical fiber output, obtains
It is exported to petaloid hot spot, carries out light intensity space filtering with single seam diaphragm again later, rotationally-varying by petaloid hot spot is converted to
The light intensity variation for crossing single seam diaphragm is based on farad when extraneous curent change causes changes of magnetic field to act on light vortex optical fiber
Magneto-optic effect can generate phase difference between the complex light swirl pattern with left and right rounding polarization state, the output of warp checking bias slice
Petaloid hot spot will rotate, and will be changed by single light intensity for stitching diaphragm, and light intensity variable quantity is directly proportional to size of current, because
This, the size of applied electric current can be measured according to light intensity variation.
The present invention compared with prior art, have following obvious prominent substantive distinguishing features and significant technology into
Step:
The optical fiber light vortex current sensor based on single seam detection of the invention is described this completely new based on single seam detection
Optical fiber light vortex current sensor have many advantages, such as detection is reliable, high sensitivity, performance are stable, it is at low cost etc. just, be light vortex
Fibre optic current sensor provides new detection scheme, has important application in sensory fields such as the current measurements of higher order mode
Value.
Detailed description of the invention
Fig. 1 is the light vortex fibre optic current sensor schematic diagram of the invention based on single seam detection.
Fig. 2 is the end face microphoto of light vortex optical fiber of the invention.
Fig. 3 is complex light swirl pattern ring-shaped light spot figure of the invention.
Fig. 4 is the petaloid hot spot figure of complex light swirl pattern of the invention after line checking bias slice.
Fig. 5 be it is of the invention in different single slit width degree and spot diameter than under parameter, the variation of diaphragm output intensity and apply
The relation curve of electric current.
Specific implementation method
The preferred embodiment of the present invention is described with reference to the drawings as follows:
Referring to Fig. 1, based on the light vortex fibre optic current sensor of single seam detection, including linearly polarized laser device 1, single mode optical fiber 2,
Polarization Controller 3, light vortex optical fiber 4, fiber grating 5, line checking bias slice 6, single seam diaphragm 7 and optical detector 8.The linear polarization swashs
The linearly polarized light that light device 1 issues is by single mode optical fiber 2 and after Polarization Controller 3, the adjustable polarised light of output polarization state, with
Light vortex optical fiber 4 carries out welding, and light is transmitted in 4 intermediate core of light vortex optical fiber.
Referring to fig. 2, this vortex optical fiber is triply coated fiber to the end face microphoto of light vortex optical fiber 4, is distinguished from inside to outside
It is fibre core, low-index layer, high refractive index layer, covering.Wherein core diameter is 3 μm, refractive index 1.461；Low-refraction ring,
Ring width is 1.45 μm, refractive index 1.4378；High refractive index ring, ring width are 1.5 μm, refractive index 1.4716；Outermost layer is packet
Layer, optical fiber overall diameter are 105 μm.Exactly because big refringence 0.0338 between high ring and low ring, so that HE21、
TE01、TM01Refringence is greater than 10 between mode-4, then HE21Mode energy and TE01、TM01Mode efficiently separates, and can generate ring
The HE of shape hot spot21Mode.
Intermediate core Gauss basic mode and toroidal cores HE can be realized using fiber bragg grating device21Odd mould or even mould Mode Coupling, i.e.,
For complex light swirl pattern.Therefore, the excitation of complex light swirl pattern, complex light swirl pattern are realized by fiber grating 5
It is transmitted in 4 toroidal cores of light vortex optical fiber after fiber grating, the fiber grating can use mechanical optical fiber, micro-bend grating
Or CO2Grating is written in Myocardial revascularization bylaser grating or ultraviolet laser.
Ring-shaped light spot is presented in light vortex optical fiber output in complex light swirl pattern, is in after line checking bias slice 6 referring to Fig. 3
Existing petaloid hot spot later by single diaphragm 7 that stitches to hot spot progress space filtering, and carries out light using optical detector 8 referring to fig. 4
Strong detection.Apply current field effect after the fiber grating on light vortex optical fiber 4, be based on Faraday magnetooptical effect, light is vortexed
Phase difference is generated between the complex light swirl pattern transmitted in optical fiber 4, delivery flap shaped laser spot will rotate, and stitch diaphragm 7 by list
Light intensity will change, light intensity variable quantity and size of current direct ratio, therefore, can measure applied electric current according to light intensity variation
Size, referring to Fig. 5.About the value of single slit width degree, we can define single slit width degree, and (spot diameter is light with spot diameter ratio
Drop to 1/e by force2Position corresponds to diameter) parameter σ, which has larger impact to current field sensing sensitivity, exists close
Like parabolic relation, in order to ensure sensing sensitivity (drop to optimum sensitivity 99%), parameter σ can use 0.32-0.37.
The foregoing is merely preferable case study on implementation of the invention, are not intended to limit the invention, all of the invention
Made any modification within spirit and principle, same replacement or improvement etc., is all included in the scope of protection of the present invention.
Claims (3)
1. a kind of light vortex fibre optic current sensor based on single seam detection, it is characterised in that: including linearly polarized laser device (1),
Single mode optical fiber (2), Polarization Controller (3), light vortex optical fiber (4), fiber grating (5), line checking bias slice (6), single seam diaphragm (7) and
Optical detector (8)；The linearly polarized light that the linearly polarized laser device (1) issues passes through single mode optical fiber (2) and passes through Polarization Controller
(3) after, welding is carried out with light vortex optical fiber (4), light is transmitted in light vortex optical fiber (4) intermediate core, is realized by fiber grating (5)
The excitation of complex light swirl pattern, then complex light swirl pattern transmits in light vortex optical fiber (4) toroidal cores, and complex light is vortexed
Mode exports in light vortex optical fiber (4) and ring-shaped light spot is presented, and after line checking bias slice (6), petaloid hot spot is presented, passes through list later
It stitches diaphragm (7) and space filtering is carried out to hot spot, single output for stitching diaphragm (7) is directed at optical detector (8), utilizes optical detector (8)
Carry out light intensity detection；Apply current field effect on the light vortex optical fiber (4) after fiber grating (5), is based on faraday's magnetic
Luminous effect generates phase difference between the complex light swirl pattern transmitted in light vortex optical fiber (4), exports from line checking bias slice (6)
Petaloid hot spot will rotate, and will be changed by single light intensity for stitching diaphragm (7), can measure applied electric current according to light intensity variation
Size.
2. the light vortex fibre optic current sensor according to claim 1 based on single seam detection, it is characterised in that: the light
Fine grating (5) uses mechanical optical fiber, micro-bend grating, CO2Grating, the optical fiber light is written in Myocardial revascularization bylaser grating or ultraviolet laser
Grid (5) realize the excitation of odd mould or even mould, as complex light swirl pattern.
3. the light vortex fibre optic current sensor according to claim 1 based on single seam detection, it is characterised in that: described
Single seam diaphragm (7) is converted into light intensity variation for rotating complex light swirl pattern bivalve caused by Faraday magnetooptical effect；It is logical
It crosses and is changed with the light intensity before and after optical detector (8) detection plus magnetic field, and then obtain the changing value of electric current；Light intensity variable quantity and electric current
Size is directly proportional, chooses suitable single slit width degree than this parameter by single slit width degree and spot diameter, makes transducer sensitivity
It reaches optimal.
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Cited By (1)
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| CN109884792A (en) * | 2019-03-26 | 2019-06-14 | 中国计量大学 | A method of the association of multi-mode composite type, which is generated, using incoherent laser array is vortexed |
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| Publication number | Priority date | Publication date | Assignee | Title |
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