CN106052594A - Method of measuring magneto optic fiber rotation angle by utilizing fiber grating laser optical beat frequency - Google Patents
Method of measuring magneto optic fiber rotation angle by utilizing fiber grating laser optical beat frequency Download PDFInfo
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- CN106052594A CN106052594A CN201610304051.2A CN201610304051A CN106052594A CN 106052594 A CN106052594 A CN 106052594A CN 201610304051 A CN201610304051 A CN 201610304051A CN 106052594 A CN106052594 A CN 106052594A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B9/00—Measuring instruments characterised by the use of optical techniques
- G01B9/02—Interferometers
- G01B9/02001—Interferometers characterised by controlling or generating intrinsic radiation properties
- G01B9/02002—Interferometers characterised by controlling or generating intrinsic radiation properties using two or more frequencies
- G01B9/02003—Interferometers characterised by controlling or generating intrinsic radiation properties using two or more frequencies using beat frequencies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
- G01M11/331—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face by using interferometer
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Abstract
The present invention discloses a method of measuring a magneto optic fiber rotation angle by utilizing a fiber grating laser optical beat frequency. The method comprises the steps of firstly placing a magneto optic fiber on a current set value condition in a room temperature environment, using a 980 nm pumping light source to output a beat frequency signal via an optical fiber resonant cavity, recording and storing the experiment data at this time, using a digital signal processor to process the experiment data, correcting the experiment data via a theoretical calculating value as a reference value, then placing the magneto optic fiber on different current conditions in the room temperature environment, using a spectrum analyzer to observe the change of the beat frequency signal, recording and storing the beat frequency signal on the corresponding current condition, finally obtaining a corresponding relationship of the beat frequency signal and the current, and measuring the rotation angle of the to-be-measured magneto optic fiber according to the corresponding relationship of the beat frequency signal and the current. The method of the present invention enables a measurement process to be simplified, is convenient and rapid, and effectively overcomes a tedious flow in a conventional rotation angle measurement method.
Description
Technical field
The invention belongs to light beat frequency and survey angle of rotation technical field, be specifically related to a kind of optical fiber Han magneto-optic and utilize fiber grating to swash
Light beat frequency measures the method for angle of rotation.
Background technology
Light beat frequency technology is as the highly important means of one of coherent detection technology, since nineteen fifty-five finds especially
Nineteen sixty laser has been developed since occurring rapidly.It plays very important work to industrial technology development and scientific research
With.At civilian aspect, light beat frequency has important application in contemporary optics measurement technology, and it is that a kind of detection small frequency is poor
The sensitiveest and fairly simple method.At military aspect, utilize light beat frequency technology that Doppler speed radar is disturbed
Technology become technology the most crucial in hyundai electronics war.Light beat frequency technology enters as the important means of relevant detection
Since technical field of measurement and test, develop into long length none guidance measurement from industrial test and undersized superhigh precision is measured, with
And the measurement of some physical quantitys.Its advantage and potentiality attract many research worker and develop Journal of Sex Research.Magneto-optic optical fiber is
Having the optical fiber of stronger magneto-optic effect, its advantage is highly sensitive, strong interference immunity, high insulation, low cost.Measure magnetic at present
The method of light optical fiber angle of rotation is a lot, and achieves multinomial achievement in research, but there is also many problem demanding prompt solutions.
The method of existing measurement magneto-optic optical fiber angle of rotation generally strict to the performance requirement of light source, optical fiber, light path is complicated, need to consider very
Multifactor, transducer sensitivity is required height, angle of rotation Measurement Resolution is low, light path system poor stability, and these factors cause
Measure high and to angle of rotation the measurement of cost not ensure.Light beat frequency technology is applied to the survey of magneto-optic optical fiber angle of rotation by us
Amount, successfully has solved these technical difficult problems.
Summary of the invention
The present invention solves that the measurement poor stability of magneto-optic optical fiber angle of rotation system, resolution is low and high in cost of production problem and
Providing a kind of method that optical fiber containing magneto-optic utilizes fiber grating laser beat frequency to measure angle of rotation, the method is by analyzing, studying
Under fiber grating laser beat frequency structure, magneto-optic optical fiber exports corresponding laser beat frequency to realize magneto-optic in different electric current environment
The measurement of optical fiber angle of rotation.
The present invention solves that above-mentioned technical problem adopts the following technical scheme that, a kind of optical fiber Han magneto-optic utilizes fiber grating to swash
Light beat frequency measures the method for angle of rotation, it is characterised in that by 980nm pump light source, 980/1550nm wavelength division multiplexer, the first light
Fine grating, Er-doped fiber, the magneto-optic optical fiber of band hot-wire coil, the second fiber grating, isolator, photodetector and spectrum analysis
Instrument constitutes the light beat frequency commercial measurement magneto-optic optical fiber angle of rotation system that utilizes, and is wherein sequentially provided with along light transmission direction and passes through optical fiber
Be connected 980nm pump light source, 980/1550nm wavelength division multiplexer, the first fiber grating, Er-doped fiber, the magnetic of band hot-wire coil
Light optical fiber, the second fiber grating, isolator and photodetector, photodetector is connected by wire with spectrum analyzer, tool
Body examination angle of rotation process is: the first fiber grating, Er-doped fiber, the magneto-optic optical fiber of band hot-wire coil and the second fiber grating composition
Fiber resonance cavity, 980nm pump light source enters fiber resonance cavity through 980/1550nm wavelength division multiplexer, sets in fiber resonance cavity
Having the Er-doped fiber of non-linear gain, when pump frequency reaches threshold value, light is inspired left-handed, dextrorotation mould in fiber resonance cavity
The polarized light of formula, is mixed at fiber grating, sees that laser beat frequency signal, first magneto-optic optical fiber exist on spectrum analyzer
In room temperature environment under conditions of current setting value, 980nm pump light source exports beat signal through fiber resonance cavity, records, deposits
Storage experimental data now, processes through digital signal processor, and is corrected as reference value by calculated value,
Then magneto-optic optical fiber is in room temperature environment under different current condition, observes the change of beat signal through spectrum analyzer, and
Record, the beat signal stored under corresponding current condition, finally give the beat signal corresponding relation with electric current also according to being somebody's turn to do
The corresponding relation of beat signal and electric current realizes the measurement of magneto-optic optical fiber angle of rotation to be measured.
The present invention compared with prior art has the advantages that
(1) utilizing laser beat frequency theoretical, optical signal repeatedly circulates to amplify in fiber resonance cavity and overflows, and passes through spectrum analysis
Instrument record, measurement data also utilize digital signal processing module quickly to process data, can carry out calculating calibration simultaneously, carry
High certainty of measurement；
(2) present invention utilizes the birefringence of optical fiber polarisation characteristic, its high sensitivity having, and the measurement making angle of rotation is accurate
Higher；
(3) present invention utilizes magneto-optic optical fiber to have the excellent of stronger magneto-optic effect, highly sensitive, strong interference immunity and high insulation
Point, is substantially reduced the cost that light path is built, and system structure is simple, it is possible to achieve the accurate measurement to different electric current backspin optic angles；
(4) process simplification is measured, convenient rapid, effectively overcome loaded down with trivial details stream present in tradition angle-of-rotation measuring method
Journey.
Accompanying drawing explanation
Fig. 1 is the light path principle figure utilizing light beat frequency commercial measurement magneto-optic optical fiber angle of rotation system in the present invention.
In figure: 1,980nm pump light source, 2,980/1550nm wavelength division multiplexer, the 3, first fiber grating, 4, er-doped light
Fibre, 5, the magneto-optic optical fiber of band hot-wire coil, the 6, second fiber grating, 7, isolator, 8, photodetector, 9, spectrum analyzer,
10, optical fiber, 11, wire.
Detailed description of the invention
By the following examples the foregoing of the present invention is described in further details, but this should be interpreted as this
The scope inventing above-mentioned theme is only limitted to below example, and all technology realized based on foregoing of the present invention belong to this
Bright scope.
(1) light beat frequency commercial measurement magneto-optic optical fiber angle of rotation system is utilized
By 980nm pump light source 1,980/1550nm wavelength division multiplexer the 2, first fiber grating 3, Er-doped fiber 4, band are energized
Magneto-optic optical fiber the 5, second fiber grating 6, isolator 7, photodetector 8 and the spectrum analyzer 9 of coil constitutes magneto-optic optical fiber and surveys
Angle of rotation system, is wherein sequentially provided with, along light transmission direction, the 980nm pump light source 1,980/ being connected by optical fiber 10
1550nm wavelength division multiplexer the 2, first fiber grating 3, Er-doped fiber 4, the magneto-optic optical fiber 5 of band hot-wire coil and the second fiber grating
6, isolator 7 and photodetector 8, spectrum analyzer 10 is connected with photodetector 8 by wire 11.
(2) measurement of magneto-optic optical fiber angle of rotation
First fiber grating, Er-doped fiber, the magneto-optic optical fiber of band hot-wire coil and the second fiber grating one optical fiber of composition
Resonator cavity, 980nm pump light source enters fiber resonance cavity by 980/1550nm wavelength division multiplexer, is provided with non-in fiber resonance cavity
The Er-doped fiber of linear gain, when pump frequency reaches threshold value, light is inspired left-handed, dextrorotation pattern in fiber resonance cavity
Polarized light, is mixed at fiber grating, can be clearly seen that laser beat frequency signal on spectrum analyzer.First magneto-optic
Optical fiber is in room temperature environment under conditions of current setting value, and 980nm pump light source exports beat signal through fiber resonance cavity, note
Record, storage experimental data now, processed through digital signal processor, and be corrected by calculated value, as
Reference value, is then in magneto-optic optical fiber under current condition different in room temperature environment, observes beat signal through spectrum analyzer
Change, and the beat signal recording, storing under different temperatures environment, measure system structure such as Fig. 1 of magneto-optic optical fiber angle of rotation
Shown in.
(3) data acquisition and processing (DAP)
While observing the beat signal that spectrum analyzer shows, the beat signal of output is entered through digital signal processor
Row data acquisition, storing and process, utilize same section of magneto-optic optical fiber, the size changing transducing part electric current under room temperature condition obtains
Different beat signal curves, record beat signal closes with the corresponding relation of electric current and according to this beat signal is corresponding with electric current
System realizes the measurement of magneto-optic optical fiber angle of rotation to be measured.
Light is by fiber grating, Er-doped fiber, transducing part and chirped fiber one optical fiber laser resonant cavity of composition, and light exists
Wherein comprise two left-handed, polarization states of dextrorotation, monitor beat signal with high-speed photodetector, then optical fiber laser resonant cavity produces
Raw beat frequency can be expressed as:
Wherein vL, vRBeing respectively two left-handed, laser frequencies of dextropolarization state, c is light spread speed in a vacuum, β
=ko(nR-n1) it is fiber birefringence constant, koIt is the propagation constant of optical fiber, nRAnd nLIt is optical fiber right-handed polarized light and left-handed respectively
The refractive index of polarized light, λoIt is the optical maser wavelength of optical fiber laser resonant cavity generation, noIt it is the mean refractive index of optical fiber.
Keep light path system to be under same room temperature condition, change size of current around magneto-optic optical fiber, due to magneto-optic light
Fine magneto-optic effect in magnetic field, the beat frequency result observed by audiofrequency spectrometer is the most different.
When light is by the magneto-optic optical fiber in magnetic field, an angle of rotation can be producedIt is referred to as the Faraday effect anglec of rotation.Root
Understand according to Faraday magnetooptical effect, angle of rotationFor:
λ in formulaoThe wavelength ejected for laserresonator, L is the magneto-optic fiber lengths of effective interaction in magnetic field.
Variable quantity and the angle of rotation of beat frequency is understood by formula (1), (2)Relation be:
From formula (3), when magneto-optic fiber lengths one timing of effective interaction, beat frequency variable quantity and rotation in magnetic field
Optic angle is linear, changes the size of electric current in magneto-optic optical fiber exterior loop, available different beat frequency curve of output and value, note
Beat frequency output valve under the different electric current of record, thus obtain the corresponding relation of tested angle of rotation and beat frequency variable quantity, eventually pass and
The calibration of calculated value obtains the size of tested magneto-optic optical fiber angle of rotation under different current value.
Embodiment above describes the ultimate principle of the present invention, principal character and advantage, the technical staff of the industry should
Understanding, the present invention is not restricted to the described embodiments, and the simply explanation present invention's described in above-described embodiment and description is former
Reason, under the scope without departing from the principle of the invention, the present invention also has various changes and modifications, and these changes and improvements each fall within
In the scope of protection of the invention.
Claims (1)
1. the method that an optical fiber Han magneto-optic utilizes fiber grating laser beat frequency to measure angle of rotation, it is characterised in that by 980nm pump
Pu light source, 980/1550nm wavelength division multiplexer, the first fiber grating, Er-doped fiber, the magneto-optic optical fiber of band hot-wire coil, the second light
Fine grating, isolator, photodetector and spectrum analyzer composition utilize light beat frequency commercial measurement magneto-optic optical fiber angle of rotation system,
Wherein be sequentially provided with along light transmission direction be connected by optical fiber 980nm pump light source, 980/1550nm wavelength division multiplexer, the
One fiber grating, Er-doped fiber, the magneto-optic optical fiber of band hot-wire coil, the second fiber grating, isolator and photodetector, photoelectricity
Detector is connected by wire with spectrum analyzer, and concrete angle of rotation process of surveying is: the first fiber grating, Er-doped fiber, band are logical
The magneto-optic optical fiber of electric coil and the second fiber grating composition fiber resonance cavity, 980nm pump light source is through 980/1550nm wavelength-division
Multiplexer enters fiber resonance cavity, is provided with the Er-doped fiber of non-linear gain in fiber resonance cavity, when pump frequency reaches threshold value,
Light is inspired the polarized light of orthogonal modes in fiber resonance cavity, is mixed at fiber grating, on spectrum analyzer
See laser beat frequency signal, first magneto-optic optical fiber in room temperature environment under conditions of current setting value, 980nm pump light source is passed through
Fiber resonance cavity output beat signal, records, stores experimental data now, process through digital signal processor, and lead to
Cross calculated value and be corrected as reference value, then magneto-optic optical fiber is in room temperature environment under different current condition, warp
Spectrum analyzer observes the change of beat signal, and the beat signal recording, storing under corresponding current condition, finally gives bat
Frequently the corresponding relation of signal and electric current realize magneto-optic optical fiber angle of rotation to be measured according to the corresponding relation of this beat signal Yu electric current
Measurement.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768871A (en) * | 2016-11-14 | 2017-05-31 | 河南师范大学 | Method based on photoswitch laser beat frequency systematic survey fibre-optical dispersion |
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