CN109000690A - A kind of double wave optical-fiber laser self-mixed interference measuring system - Google Patents
A kind of double wave optical-fiber laser self-mixed interference measuring system Download PDFInfo
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- 229910052691 Erbium Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
- G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35322—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using interferometer with one loop with several directions of circulation of the light, e.g. Sagnac interferometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35383—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using multiple sensor devices using multiplexing techniques
- G01D5/35387—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using multiple sensor devices using multiplexing techniques using wavelength division multiplexing
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Abstract
The invention discloses a kind of double wave optical-fiber laser self-mixed interference measuring systems, belong to field of optical measuring technologies.The system is by pump light source, four fiber couplers, two wavelength division multiplexers, two sections of Er-doped fibers, five fiber optical circulators, five fiber gratings, one FC/PC connector, two detectors, two frequency shifters, one outgoing head, two driving powers, a frequency mixer, signal processing circuit 1, signal processing circuit 2, signal processing circuit 3, signal processing circuit 4, computer and output result composition.Optical fiber and optical fibre device constitute two laser resonators, and two sections of Er-doped fibers are respectively two laser resonator gain medias, and fiber grating is wavelength selective elements, constitute dual laser.Dual-wavelength laser is referenced object respectively and testee is reflected back respective laser resonator and intracavitary light generates heterodyne self-mixing interference after shift frequency.This signal is handled, realizes the measurement to the displacement of testee etc..
Description
Technical field
The present invention relates to field of optical measurements more particularly to a kind of double wave optical-fiber laser self-mixed interference measuring systems.
Background technique
The existing document being close with this technology has following two:
[1]D.P.Hand,T.A.Carolan,J.S.Barton,and J.D.C.Jones.“Profile
measurement of optically rough surfaces by fiber-optic interferometry”,
Opt.Lett., Vol.18, No.16,1993, and P.1361-1363. (Optics Letters (optics letter), volume 18, the 16th
Phase, P.1361-1363)
The technical principle of document [1] is as shown in Figure 1.
The light that semiconductor laser issues reaches measuring head, measurement after faraday isolator and optical fiber three-dB coupler
Head is a Feisuo interferometer, and a part of light is used as reference light by fiber end face reflection, and another part light passes through self-focusing lens
It after focusing, projects on measured surface, come back in system by measured surface reflection and is interfered with reference light, interference letter
It number is detected by detector, the phase decision of interference signal is in longitudinal height of measured surface measured point；Change the drive of the laser
Streaming current measures same point with the light of four kinds of different frequencies with changing the luminous frequency of laser, obtains four interference
Signal, since incident light wave frequency is different, the position of four interference signals is mutually just different, adjusts driving current, makes two neighboring dry
The phase difference pi/2 for relating to signal can demodulate the optical path difference D of the point, that is, complete the measurement of single-point by the following formula:
In(n=1,2,3,4) is the intensity of n-th interference signal, and c is the light velocity, and ν is incident light frequency.
Stepper motor drives measuring head transversal scanning measured surface again, that is, completes the measurement to measured surface.
[2]Dejiao Lin,Xiangqian Jiang,Fang Xie,Wei Zhang,Lin Zhang and Ian
Bennion.“High stability multiplexed fibre interferometer and its application
On absolute displacement measurement and on-line surface metrology ", Optics
Express, Vol.12, Issue 23,2004, P.5729-5734. (Optics Express (optics is express), 2004, the
Volume 12, the 23rd phase, P.5729-5734)
The technical schematic diagram of document [2] is as shown in Figure 2.
This system includes the Michelson's interferometer that two optical paths are almost overlapped.One Michelson's interferometer is to utilize survey
The fiber grating and reference mirror measured on arm are constituted as reflecting mirror, for completing steady operation；Another Michelson's interferometer
It is to be constituted using measurement mirror and reference mirror as reflecting mirror, for completing measurement work.Because the reference arm of two interferometers is total
It is completely coincident with the reference arm optical path of a reflecting mirror, two interferometers, and since the measurement arm of two interferometers is almost overlapped,
So as soon as an interferometer stabilizes, another interferometer also stabilizes.
Issuing wavelength by semiconductor laser is λ0Light be divided into two-way after two three-dB couplers, all the way by light
Fine optical grating reflection, another way are referenced reflecting mirror reflection.Two-way reflected light is met and is done again after three-dB coupler
It relating to, interference signal is reflected after circulator by another fiber grating, and circulator is again passed by, is then detected by detector,
The signal that this detector detects passes through the reference arm of the dynamic piezoelectric ceramic tube adjusting fibre optic interferometer of servo circuit processing rear-guard
Length makes two interfere arms for stablizing interferometer be in quadrature (phase difference pi/2) always, stablizes the interference to realize
The purpose of instrument.
The wavelength X that tunable laser issuesmVariable light is divided into two-way after two optical fiber three-dB couplers, and one
Road is turned again in interferometer by the reflection of measurement mirror again after optical fiber self-focus lens, and another way passes through optical fiber self-focus lens
It is turned again in interferometer by reference mirror reflection again afterwards, two-way light meets after three-dB coupler, forms interference signal, this is dry
Signal is related to after circulator and fiber grating, is detected by detector, is the displacement for measuring measurement mirror using phase analysis.
Above-mentioned two problem and shortage of the existing technology is:
1, it is difficult to measure the object of antiradar reflectivity.
2, cannot the parameters such as speed, vibration to object measure.
Summary of the invention
The present invention constitutes two optical fiber laser resonant cavities independent but that light-emitting surface is coplanar using optical fiber and optical fibre device,
980nm pump light source (S) is used as pump light source, increasing of two sections of Er-doped fiber EDF respectively as this two optical fiber laser resonant cavities
Beneficial medium, wavelength selection of the different fiber grating FBG of two bragg wavelengths respectively as this two optical fiber laser resonant cavities
Element meets this two optical fiber laser resonant cavity condition of resonance and two in corresponding fiber grating FBG reflectance spectrum respectively
The laser of wavelength passes through two frequency shifter shift frequencies, and the laser of a wavelength is incorporated by reference the fiber grating reflection of object, another
The laser of wavelength projects on testee after being emitted head G and is reflected or scattered by testee.Two wavelength swash
Light is reflected back toward respective optical fiber laser resonant cavity respectively, and heterodyne self-mixed interference occurs with respective intracavitary light, forms two tunnels
Heterodyne self-mixing interference, bis- tunnel heterodyne self-mixing interference of Dui Zhe are handled, and realize displacement to testee, speed
The parameter measurements such as degree, vibration.Optical fiber laser resonant cavity has amplification to intracavitary light is fed back to, so this system can be to low anti-
The object for penetrating rate measures.Optical fiber laser is both sensor and interferometer, and for all -fiber optical path without adjusting, structure is simple
It is compact, it is easy to carry about with one.
The present invention is achieved by the following technical solutions.
A kind of double wave optical-fiber laser self-mixed interference measuring system, by 980nm pump light source (S), four fiber couplers
N1, N2, N3, N4, two wavelength division multiplexer WDM1, WDM2, two sections of Er-doped fiber EDF1, EDF2, five fiber optical circulator C1,
C2, C3, C4, C5, five fiber gratings FBG11, FBG21, FBG12, FBG22, FGB13, a FC/PC connector, two detections
Device PD1, PD2, two frequency shifter AOM1, AOM2, an outgoing head G, two driving powers RF1, RF2, a frequency mixer, signal
Processing circuit 1 (B1), signal processing circuit 2 (B2), signal processing circuit 3 (B3), signal processing circuit 4 (B4), computer
(B5) it is formed with output result (B6).Wherein, the bragg wavelength of fiber grating FBG11, FBG12, FBG13 is identical, optical fiber light
The bragg wavelength of grid FBG21, FBG22 are identical.The part reflectance coating of 1550nm wave band is plated in one end face of FC/PC connector.
The light that 980nm pump light source (S) issues is divided into two-way light by fiber coupler N1, wherein light passes through wavelength-division multiplex all the way
Device WDM1 is coupled into an optical fiber laser resonant cavity, by Er-doped fiber EDF1, inspires the fluorescence of 1550nm wave band, this fluorescence
Fiber grating FBG11 is reached after fiber optical circulator C1, meets the light of fiber grating FBG11 Bragg condition by fiber grating
FBG11 reflection, reflected light again pass by fiber optical circulator C1, by fiber coupler N2 and fiber optical circulator C5, reach FC/PC
Connector, a part of light intensity are reflected by FC/PC connector, this part light intensity is along backtracking optical fiber laser resonant cavity；Another part light
It is reflected after frequency shifter AOM1 and AOM2 shift frequency by fiber grating FBG13 through FC/PC connector by force.It is anti-by FC/PC connector
The light of optical fiber laser resonant cavity is emitted back towards by fiber optical circulator C5, after fiber optical circulator C3, reaches fiber grating FBG12, and by
Fiber grating FBG12 reflection, again passes by fiber optical circulator C3, by fiber coupler N3, wavelength division multiplexer WDM1, by mixing
Erbium optical fiber EDF1, light intensity are amplified by Er-doped fiber EDF1, and the light intensity of amplification passes through fiber optical circulator C1, reach fiber grating
FBG11 is reflected by fiber grating FBG11, again passes by fiber optical circulator C1, fiber coupler N2, fiber optical circulator C5, is reached
FC/PC connector, a part of light intensity are reflected by FC/PC connector, this part light intensity is along backtracking optical fiber laser resonant cavity, another portion
Light splitting penetrates by force FC/PC connector.It loops back and forth like this, when gain is greater than loss, from a length of optical fiber light of FC/PC connector outgoing wave
The laser of the bragg wavelength of grid FBG11.
Another way light from fiber coupler N1 is coupled into another optical-fiber laser resonance by wavelength division multiplexer WDM2
Chamber inspires the fluorescence of 1550nm wave band by Er-doped fiber EDF2, this fluorescence reaches optical fiber light after fiber optical circulator C2
Grid FBG21, the light for meeting fiber grating FBG21 Bragg condition are reflected by fiber grating FBG21, and reflected light again passes by optical fiber
Circulator C2 reaches FC/PC connector by fiber coupler N2 and fiber optical circulator C5, and a part of light intensity is anti-by FC/PC connector
It penetrates, this part light intensity is along backtracking optical fiber laser resonant cavity；Another part light intensity penetrates FC/PC connector, by frequency shifter
After AOM1 and AOM2 shift frequency, and outgoing head G, project on testee.Optical fiber laser resonant cavity is reflected back by FC/PC connector
Light pass through fiber optical circulator C5, fiber optical circulator C3, fiber grating FBG12, fiber optical circulator C4, reach fiber grating
FBG22, and reflected by fiber grating FBG22, fiber optical circulator C4 is again passed by, by fiber coupler N4, wavelength division multiplexer
WDM2, by Er-doped fiber EDF2, light intensity is amplified by Er-doped fiber EDF2, and the light intensity of amplification passes through fiber optical circulator C2, is reached
Fiber grating FBG21 is reflected by fiber grating FBG21, again passes by fiber optical circulator C2, fiber coupler N2, optical fiber ring
Device C5 reaches FC/PC connector, and a part of light intensity is reflected by FC/PC connector, this part light intensity is along backtracking optical-fiber laser resonance
Chamber, another part light intensity penetrate FC/PC connector, loop back and forth like this, when gain is greater than loss, from FC/PC connector outgoing wave
The laser of the bragg wavelength of a length of fiber grating FBG21.
The laser for two wavelength being emitted from FC/PC connector reaches optical fiber light after frequency shifter AOM1 and AOM2 shift frequency
Grid FBG13, wavelength is that the laser of the bragg wavelength of fiber grating FBG11 is reflected by fiber grating FBG13, along backtracking pair
Heterodyne self-mixed interference occurs for the optical fiber laser resonant cavity and intracavitary light answered.Wavelength is the Bradley lattice wave of fiber grating FBG21
Long laser light fiber grating FBG13 projects on testee by being emitted head G, is reflected by testee or scattered edge
Heterodyne self-mixed interference, two tunnel heterodyne self-mixed interferences letter occur for the corresponding optical fiber laser resonant cavity of backtracking and intracavitary light
Number respectively after fiber coupler N3 and fiber coupler N4, detected respectively by detector PD1 and detector PD2.By optical fiber
The light that grating FBG 13 reflects contains from FC/PC connector to the light path fiber grating FBG13 by the information of environmental disturbances, from quilt
The light for surveying object reflection or scattering contains other than the information such as testee displacement, speed, vibration, also containing from FC/PC connector to optical fiber
The information of light path between grating FBG 13 by environmental disturbances.The signal that detector PD1 is detected passes through signal processing circuit 1
(B1) it handles, the signal that detector PD2 is detected is handled by signal processing circuit 2 (B2).Meanwhile two driving power RF1
On the one hand the signal issued with RF2 is added on frequency shifter AOM1 and AOM2 respectively, frequency shifter AOM1 and AOM2 is made to work；Another party
The mixing of face input mixer, the output signal of frequency mixer is after signal processing circuit 3 (B3) processing, with signal processing circuit 1
(B1) input signal processing circuit 4 (B4) is handled the output signal of output signal and signal processing circuit 2 (B2) simultaneously.
Output signal input computer (B5) of signal processing circuit 4 (B4) is disappeared after being for data processing by computer (B5) program
In addition to from FC/PC connector to the light path fiber grating FBG13 by the measurement result of environmental disturbances, it is defeated by output result (B6)
Out.
Further, preferably, two light independent but that light-emitting surface is coplanar are constituted using optical fiber and optical fibre device
Fine laser resonator, wave of the different fiber grating FBG of two bragg wavelengths respectively as this two optical fiber laser resonant cavities
Long selection element, gain media of two sections of Er-doped fiber EDF respectively as this two optical fiber laser resonant cavities, two optical-fiber lasers
Resonant cavity generates all stable laser of frequency and power respectively.
Further, preferably, a wavelength is referenced object (fiber grating FBG13) reflection, for compensating environment
Interference；Another wavelength projects on testee, is reflected by testee, for measuring to testee.Two waves
Length is reflected back toward respective optical fiber laser resonant cavity, and the light self-mixed interference in respective optical fiber laser resonant cavity is produced from
Mixed interference signal.
Further, preferably, it is carried out using laser frequency of two frequency shifter AOM1 and AOM2 to two wavelength
Shift frequency is reflected back respective optical fiber laser resonant cavity by the laser of two wavelength of shift frequency respectively, and respective
Light in optical fiber laser resonant cavity generates two tunnel heterodyne self-mixing interferences, by the processing to two road heterodyne interference signals,
Realize the high-acruracy survey to parameters such as the displacement of object, speed, vibrations.
There are five beneficial effects of the present invention are main:
1. the present invention constitutes two optical fiber laser resonant cavities independent but that light-emitting surface is coplanar using optical fiber and optical fibre device,
The different fiber grating FBG of two bragg wavelengths respectively as this two optical fiber laser resonant cavities wavelength selective elements, two
Section Er-doped fiber EDF respectively as this two optical fiber laser resonant cavities gain media, generate power and frequency it is all stable two
The laser of a wavelength.
2. a wavelength is referenced object (fiber grating FBG13) reflection, for compensating environmental disturbances；The projection of another wavelength
It onto testee, is reflected by testee, for being measured to testee.Two wavelength are reflected back toward respective optical fiber
Light self-mixed interference in laser resonator, with respective optical fiber laser resonant cavity generates self-mixing interference.
3. carrying out shift frequency using laser frequency of two frequency shifters to two wavelength, the heterodyne for generating two wavelength mixes certainly
Interference signal handles the heterodyne self-mixing interference of this two wavelength, realize to the displacement of testee, speed,
The measurement of the parameters such as vibration.
4. the present invention is using the gain media in two optical fiber laser resonant cavities to the light returned in optical fiber laser resonant cavity
There is amplification, realizes the measurement to antiradar reflectivity object.
5. double wave optical fiber laser itself integrates sensor and interferometer in the present invention, all -fiber optical path is without adjusting
Section, it is simple and compact for structure to be easy to carry about with one.
Detailed description of the invention
Fig. 1 is the schematic diagram of existing technical literature [1]；
Fig. 2 is the schematic diagram of existing technical literature [2]；
Fig. 3 is principle of the invention figure.
Specific embodiment
With reference to the accompanying drawing 3 and specific embodiment the invention will be further described.
As shown in figure 3, by 980nm pump light source (S), four fiber couplers N1, N2, N3, N4, two wavelength division multiplexers
WDM1, WDM2, two sections of Er-doped fiber EDF1, EDF2, five fiber optical circulators C1, C2, C3, C4, C5, five fiber gratings
FBG11, FBG21, FBG12, FBG22, FBG13, a FC/PC connector, two detector PD1, PD2, two frequency shifter AOM1,
AOM2, an outgoing head G, two driving powers RF1, RF2, a frequency mixer, signal processing circuit 1 (B1), signal processing electricity
Road 2 (B2), signal processing circuit 3 (B3), signal processing circuit 4 (B4), computer (B5) and output result (B6) composition.
This measuring system constitutes two optical-fiber laser resonance independent but that light-emitting surface is coplanar using optical fiber and optical fibre device
Chamber, the different fiber grating FBG of two bragg wavelengths respectively as this two optical fiber laser resonant cavities wavelength selective elements,
Two sections of Er-doped fiber EDF issue the laser of two wavelength respectively as this two optical fiber laser resonant cavity gain medias.One wave
Long laser is for eliminating environmental disturbances, and the laser of another wavelength is for measuring.The laser of two wavelength passes through two shift frequencies
After device shift frequency, the fiber grating before the laser of a wavelength is located at outgoing head is reflected back corresponding laser resonator and intracavitary
Light generates heterodyne self-mixed interference；The laser of another wavelength projects on testee by outgoing head, anti-by testee
It penetrates or is scattered back corresponding optical fiber laser resonant cavity and intracavitary light generates heterodyne self-mixed interference.This two wavelength are swashed
The heterodyne self-mixing interference of light obtains measured object displacement, speed, vibration height measurement results after being handled.Light in system
For the bragg wavelength of fine grating FBG in 1550nm wave band, the bragg wavelength of fiber grating FBG11, FBG12, FBG13 are identical,
The bragg wavelength of fiber grating FBG21, FBG22 are identical.The part that 1550nm wave band has been plated in one end face of FC/PC connector is anti-
Penetrate film.
The light that 980nm pump light source (S) issues is divided into two-way light by fiber coupler N1, wherein light passes through all the way
Wavelength division multiplexer WDM1 is coupled into an optical fiber laser resonant cavity, and the light stimulus Er-doped fiber EDF1 of 980nm generates 1550nm wave
Section fluorescence, this fluorescence reach fiber grating FBG11 after fiber optical circulator C1, meet fiber grating FBG11 Bragg condition
Light reflected by fiber grating FBG11, reflected light again passes by fiber optical circulator C1, by fiber coupler N2, optical fiber ring
Device C5 reaches FC/PC connector, and a part of light intensity is reflected back optical fiber laser resonant cavity by FC/PC connector, and another part light intensity is saturating
It penetrates.The light for being reflected back toward optical fiber laser resonant cavity again passes by fiber optical circulator C5, by fiber optical circulator C3, reaches optical fiber light
Grid FBG12.Since fiber grating FBG12 is identical with the bragg wavelength of fiber grating FBG11, so reaching fiber grating
The light of FBG12 is reflected by fiber grating FBG12.Fiber optical circulator C3 is again passed by by the fiber grating FBG12 light reflected, is passed through
Fiber coupler N3, wavelength division multiplexer WDM1 reach Er-doped fiber EDF1, and light intensity is amplified by Er-doped fiber EDF1, by optical fiber
Fiber grating FBG11 is reached after circulator C1, and is reflected by fiber grating FBG11, fiber optical circulator C1 is again passed by, by light
After fine coupler N2, fiber optical circulator C5, FC/PC connector is reached, it is humorous that a part of light intensity by FC/PC connector is reflected back optical-fiber laser
Shake chamber, the transmission of another part light intensity.It loops back and forth like this, meets optical fiber laser resonant cavity condition of resonance and in fiber grating
Wavelength in FBG11 reflectance spectrum generates resonance, generates laser when gain is greater than loss, is exported by FC/PC connector, and output swashs
Light frequency is f01.For laser after frequency shifter AOM1 and AOM2, frequency will generate fYFrequency displacement, laser frequency become f01+fY.This
Light reaches fiber grating FBG13, and is reflected by fiber grating FBG13, and frequency shifter AOM1 and AOM2 are again passed by, and laser frequency becomes
For f01+2fY.The light of this frequency passes through FC/PC connector, meets with the light of optical fiber laser resonant cavity, and generation frequency is 2fYHeterodyne is certainly
Mixed interference signal.This heterodyne self-mixing interference passes through fiber optical circulator C5, after fiber optical circulator C3, reaches fiber grating
FBG12 is simultaneously reflected by fiber grating FBG12, again passes by fiber optical circulator C3, after fiber coupler N3, reaches detector
PD1 is detected by detector PD1.The heterodyne self-mixing interference input signal processing circuit 1 (B1) that detector PD1 is detected
It is handled.
Another way light from fiber coupler N1 is coupled into another optical-fiber laser resonance by wavelength division multiplexer WDM2
The light stimulus Er-doped fiber EDF2 of chamber, 980nm generates 1550nm wave band fluorescence, this fluorescence reaches light after fiber optical circulator C2
Fine grating FBG 21, the light for meeting fiber grating FBG21 Bragg condition are reflected by fiber grating FBG21, and reflected light again passes by
Fiber optical circulator C2 reaches FC/PC connector by fiber coupler N2, fiber optical circulator C5, and a part of light intensity is connect by FC/PC
Head is reflected back optical fiber laser resonant cavity, another part transmission.The light for being reflected back toward optical fiber laser resonant cavity again passes by fiber optic loop
Row device C5 reaches fiber grating FBG22 by fiber optical circulator C3, fiber grating FBG12, fiber optical circulator C4.Due to optical fiber
Grating FBG 22 is identical with the bragg wavelength of fiber grating FBG21, so reaching the light of fiber grating FBG22 by fiber grating
FBG22 reflection.Fiber optical circulator C4 is again passed by by the fiber grating FBG22 light reflected, by fiber coupler N4, wavelength-division is multiple
With device WDM2, Er-doped fiber EDF2 is reached, light intensity is amplified by Er-doped fiber EDF2, and optical fiber light is reached after fiber optical circulator C2
Grid FBG21, and reflected by fiber grating FBG21, fiber optical circulator C2 is again passed by, by fiber coupler N2, optical fiber ring
After device C5, FC/PC connector is reached, a part of light intensity is reflected back optical fiber laser resonant cavity by FC/PC connector, and another part light intensity is saturating
It penetrates.It loops back and forth like this, meets optical fiber laser resonant cavity condition of resonance and the wavelength in fiber grating FBG21 reflectance spectrum generates
Resonance generates laser when gain is greater than loss, is exported by FC/PC connector.The laser frequency of output is f02.Laser passes through shift frequency
Its frequency will generate f after device AOM1 and AOM2YFrequency displacement, laser frequency become f02+fY, this light projected after being emitted head G by
It surveys on object, is reflected by testee or be scattered back optical fiber laser resonant cavity.Since testee is moving, project tested
On object and reflected or the light that scatters will generate Doppler frequency shift fD2, so, the light for being reflected or being scattered by testee
Frequency be f02+fY±fD2.This light again passes by frequency shifter AOM1 and AOM2 after being emitted head G, and laser frequency will generate fY
Frequency displacement, laser frequency become f02+2fY±fD2.The light of this frequency passes through FC/PC connector, meets with the light of optical fiber laser resonant cavity,
Generation frequency is 2fY±fD2Heterodyne self-mixing interference.This heterodyne self-mixing interference passes through fiber optical circulator C5, optical fiber
After circulator C3, fiber grating FBG12, fiber optical circulator C4, reaches fiber grating FBG22 and is reflected by fiber grating FBG22,
Fiber optical circulator C4 is again passed by, after fiber coupler N4, detector PD2 is reached, is detected by detector PD2.Detector
The heterodyne self-mixing interference input signal processing circuit 2 (B2) that PD2 is detected is handled.
On the one hand the signal that driving power RF1 and driving power RF2 is issued is added in frequency shifter AOM1 and frequency shifter respectively
On AOM2, frequency shifter AOM1 and frequency shifter AOM2 is made to work；The mixing of another aspect input mixer, the output signal warp of frequency mixer
After crossing signal processing circuit 3 (B3) processing, with the output signal of signal processing circuit 1 (B1) and signal processing circuit 2 (B2)
Input signal processing circuit 4 (B4) carries out signal processing to output signal simultaneously, and the output signal of signal processing circuit 4 (B4) is passed through
After program in computer (B5) is for data processing, measurement result is obtained, is exported by output result (B6).
Realization in order to demonstrate the invention, describes above-mentioned specific example, but other variations of the invention and repairs
Change, it will be apparent to those skilled in the art that, appointing within the scope of essence and basic principle of the present invention without disclosure
What modification/variation imitates transformation to belong to claims of the invention.
Claims (3)
1. a kind of double wave optical-fiber laser self-mixed interference measuring system, it is characterised in that be four by 980nm pump light source (S)
Fiber coupler N1, N2, N3, N4, two wavelength division multiplexer WDM1, WDM2, two sections of Er-doped fibers EDF1, EDF2, five optical fiber
Circulator C1, C2, C3, C4, C5, five fiber gratings FBG11, FBG21, FBG12, FBG22, FBG13, a FC/PC connector,
Two detectors PD1, PD2, two frequency shifters AOM1, AOM2, an outgoing head G, two driving powers RF1, RF2, one mixed
Frequency device, signal processing circuit 1 (B1), signal processing circuit 2 (B2), signal processing circuit 3 (B3), signal processing circuit 4 (B4),
Computer (B5) and output result (B6) composition；Wherein, fiber grating FBG11, fiber grating FBG12 and fiber grating FBG13
Bragg wavelength it is identical, fiber grating FBG21 is identical with the bragg wavelength of fiber grating FBG22；One of FC/PC connector
The part reflectance coating of 1550nm wave band is plated in end face；The light that 980nm pump light source (S) issues is divided by fiber coupler N1
Two-way light, wherein light is coupled into an optical fiber laser resonant cavity, the light stimulus er-doped of 980nm by wavelength division multiplexer WDM1 all the way
Optical fiber EDF1 generates 1550nm wave band fluorescence, this fluorescence reaches fiber grating FBG11 after fiber optical circulator C1, meets optical fiber
The light of the wavelength of 11 Bragg condition of grating FBG is reflected by fiber grating FBG11, and reflected light again passes by fiber optical circulator C1,
By fiber coupler N2, fiber optical circulator C5, FC/PC connector is reached, a part of light intensity is reflected back optical fiber by FC/PC connector and swashs
Optical cavity, the transmission of another part light intensity；The light for being reflected back toward optical fiber laser resonant cavity again passes by fiber optical circulator C5, passes through
Fiber optical circulator C3 reaches fiber grating FBG12；Due to the bragg wavelength phase of fiber grating FBG12 and fiber grating FBG11
Together, so the light for reaching fiber grating FBG12 is reflected by fiber grating FBG12；It is passed through again by the light that fiber grating FBG12 reflects
Fiber optical circulator C3 is crossed, by fiber coupler N3, wavelength division multiplexer WDM1, reaches Er-doped fiber EDF1, light intensity is by er-doped light
Fine EDF1 amplification, reaches fiber grating FBG11, and reflected after fiber optical circulator C1 by fiber grating FBG11, again passes by
Fiber optical circulator C1 after fiber optical circulator C5, reaches FC/PC connector, a part of light intensity is by FC/PC by fiber coupler N2
Connector is reflected back optical fiber laser resonant cavity, the transmission of another part light intensity；It loops back and forth like this, meets optical fiber laser resonant cavity resonance
Condition and the wavelength generation resonance in fiber grating FBG11 reflectance spectrum, generate laser when gain is greater than loss, by FC/PC
Connector output, the laser frequency of output are f01；For laser after frequency shifter AOM1 and AOM2, frequency will generate fYFrequency displacement swashs
Light frequency becomes f01+fY, this light reaches fiber grating FBG13, and is reflected by fiber grating FBG13, and frequency shifter is again passed by
AOM1 and AOM2, laser frequency become f01+2fY, the light of this frequency is by FC/PC connector, the light phase with optical fiber laser resonant cavity
It meets, generation frequency is 2fYHeterodyne self-mixing interference, this heterodyne self-mixing interference pass through fiber optical circulator C5, optical fiber
After circulator C3, reaches fiber grating FBG12 and reflected by fiber grating FBG12, fiber optical circulator C3 is again passed by, by light
After fine coupler N3, detector PD1 is reached, is detected by detector PD1, the heterodyne self-mixed interference letter that detector PD1 is detected
Number input signal processing circuit 1 (B1) is handled；Another way light from fiber coupler N1 passes through wavelength division multiplexer WDM2
It is coupled into another optical fiber laser resonant cavity, the light stimulus Er-doped fiber EDF2 of 980nm generates 1550nm wave band fluorescence, this fluorescence
Fiber grating FBG21 is reached after fiber optical circulator C2, meets the light of fiber grating FBG21 Bragg condition by fiber grating
FBG21 reflection, reflected light again pass by fiber optical circulator C2, by fiber coupler N2, fiber optical circulator C5, reach FC/PC
Connector, a part of light intensity are reflected back optical fiber laser resonant cavity, the transmission of another part light intensity by FC/PC connector；It is reflected back toward optical fiber
The light of laser resonator again passes by fiber optical circulator C5, by fiber optical circulator C3, fiber grating FBG12, fiber optical circulator
C4 reaches fiber grating FBG22；Since fiber grating FBG22 is identical with the bragg wavelength of fiber grating FBG21, so arriving
Light up to fiber grating FBG22 is reflected by fiber grating FBG22；Fiber optic loop is again passed by by the fiber grating FBG22 light reflected
Row device C4 reaches Er-doped fiber EDF2 by fiber coupler N4, wavelength division multiplexer WDM2, and light intensity is put by Er-doped fiber EDF2
Greatly, fiber grating FBG21 is reached after fiber optical circulator C2, and is reflected by fiber grating FBG21, and optical fiber ring is again passed by
Device C2 after fiber optical circulator C5, reaches FC/PC connector, a part of light intensity is reflected by FC/PC connector by fiber coupler N2
Back into optical fibers laser resonator, the transmission of another part light intensity；Loop back and forth like this, meet optical fiber laser resonant cavity condition of resonance and
Wavelength in fiber grating FBG21 reflectance spectrum generates resonance, generates laser when gain is greater than loss, is exported by FC/PC connector,
The laser frequency of output is f02；For laser after frequency shifter AOM1 and AOM2, frequency will generate fYFrequency displacement, laser frequency become
f02+fY, this light projects on testee after being emitted head G, is reflected by testee or be scattered back optical-fiber laser resonance
Chamber；Since testee is moving, projects on testee and the light for being reflected or being scattered will generate Doppler frequency shift fD2,
So being f by the frequency for the light that testee reflects or scatters02+fY±fD2；This light again passes by shifting after being emitted head G
Frequency device AOM1 and AOM2, laser frequency will generate fYFrequency displacement, laser frequency become f02+2fY±fD2；The light of this frequency passes through FC/
PC connector meets with the light of optical fiber laser resonant cavity, and generation frequency is 2fY±fD2Heterodyne self-mixing interference；This heterodyne is certainly
Mixed interference signal passes through fiber optical circulator C5, fiber optical circulator C3, fiber grating FBG12, after fiber optical circulator C4, reaches light
Fine grating FBG 22 is simultaneously reflected by fiber grating FBG22, again passes by fiber optical circulator C4, after fiber coupler N4, is reached
Detector PD2 is detected by detector PD2；The heterodyne self-mixing interference input signal processing circuit that detector PD2 is detected
2 (B2) are handled；On the one hand the signal that driving power RF1 and driving power RF2 is issued is added in frequency shifter AOM1 and shifting respectively
On frequency device AOM2, frequency shifter AOM1 and frequency shifter AOM2 is made to work；The mixing of another aspect input mixer, the output letter of frequency mixer
Number by signal processing circuit 3 (B3) processing after, output signal and signal processing circuit 2 with signal processing circuit 1 (B1)
(B2) input signal processing circuit 4 (B4) carries out signal processing, the output letter of signal processing circuit 4 (B4) to output signal simultaneously
Number after the program in computer (B5) is for data processing, measurement result is obtained, is exported by output result (B6).
2. a kind of double wave optical-fiber laser self-mixed interference measuring system according to claim 1, it is characterised in that: utilize light
Fine and optical fibre device constitutes two optical fiber laser resonant cavities independent but that light-emitting surface is coplanar, the different light of two bragg wavelengths
Fine grating FBG is respectively as the wavelength selective elements of this two optical fiber laser resonant cavities, and two sections of Er-doped fiber EDF are respectively as this
The gain media of two optical fiber laser resonant cavities generates the laser of power and all stable two wavelength of frequency.
3. a kind of double wave optical-fiber laser self-mixed interference measuring system according to claim 1, it is characterised in that: utilize two
A frequency shifter carries out shift frequency to the laser frequency of two wavelength, generates the heterodyne self-mixing interference of two wavelength, to this two
The heterodyne self-mixing interference of a wavelength is handled, and realizes the survey to parameters such as the displacement of testee, speed, vibrations
Amount.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114252411A (en) * | 2020-09-25 | 2022-03-29 | 苹果公司 | Surface quality sensing using self-mixing interferometry |
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| CN114252411A (en) * | 2020-09-25 | 2022-03-29 | 苹果公司 | Surface quality sensing using self-mixing interferometry |
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