CN109239726A - A kind of noncooperative target range-measurement system based on the double comb femto-second lasers of separate unit - Google Patents

A kind of noncooperative target range-measurement system based on the double comb femto-second lasers of separate unit Download PDF

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Publication number
CN109239726A
CN109239726A CN201811005370.9A CN201811005370A CN109239726A CN 109239726 A CN109239726 A CN 109239726A CN 201811005370 A CN201811005370 A CN 201811005370A CN 109239726 A CN109239726 A CN 109239726A
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light
beam splitter
wave plate
femto
lasers
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CN109239726B (en
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宋有建
武子铃
李润敏
刘博文
柴路
胡明列
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Tianjin University
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Tianjin University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4818—Constructional features, e.g. arrangements of optical elements using optical fibres

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Lasers (AREA)

Abstract

The invention discloses a kind of noncooperative target range-measurement systems based on the double comb femto-second lasers of separate unit, including the double comb femto-second lasers of separate unit, it further include filter, first collimator, first half-wave plate, first polarization beam splitter prism, second half-wave plate, second polarization beam splitter prism, silvered mirror, avalanche photodetector, data acquisition device, computer, frequency counter, amplification and filter, Polarization Controller, fibre optic polarizing beam splitter, second collimator, third half-wave plate, third collimator, apply card telescope, third polarization beam splitter prism and the 4th half-wave plate；The range-measurement system can save traditional double femto-second lasers phase-locking device complicated in linear Asynchronous sampling system, faint target diffusing reflection light echo is received by large aperture telescope, it improves interference signal signal-to-noise ratio and then improves measurement accuracy, while avoiding the measurement error as caused by weak heliogram in non-linear asynchronous-sampling.

Description

A kind of noncooperative target range-measurement system based on the double comb femto-second lasers of separate unit
Technical field
The present invention relates to a kind of laser ranging systems, and in particular to a kind of non-cooperation based on the double comb femto-second lasers of separate unit Object ranging system.
Background technique
There are many kinds of the methods of laser ranging.Laser interference ranging is one of which, i.e., using the principle of interference of light to list The phase change of the exploring laser light of frequency measures.The precision of laser interference ranging can achieve Nano grade, be usually used in precision The measurement of length, microsize, but this method is displaced based on the increment type of target.Laser absolute distance measurement is that one kind is not required to The method for wanting the direct measurement target range of target incremental displacement, it is in large scale industry manufacture, remote sensing, satellite formation flying It is of great significance in the precise measurement in equal large spaces range field and important application.Absolute distance is surveyed in the appearance of femtosecond laser Amount provides many new thinkings, it rapidly becomes international research hot spot with the advantages that quick, large scale, high-precision.Femtosecond swashs Light is realized by the locking of the intracavitary longitudinal mode of laser resonance, and indulging at equal intervals for millions of PGC demodulation is shown as on frequency domain Mould, wherein longitudinal mode spacing is equal to the repetition rate of femtosecond mode locking pulse, shows as equally spaced ultrashort pulse in the time domain.2000 Year, Minoshima et al. has been put forward for the first time the innovation concept that absolute length measurement is carried out using femto-second laser pulse；2004, Professor Ye Jun of American Bureau of Standards (ABS) theoretically proposes a kind of scheme for measuring absolute distance, by flight time telemetry and interference Telemetry is used in a set of range-measurement system, carries out accurate measurement with interferometry again with flight time telemetry bigness scale.This method exists The measurement of nanometer scale precision can be theoretically carried out to any remote target range.Common list femtosecond laser absolute distance is surveyed Amount device, which needs to measure light and reference light, has lap in conjunction beam afterpulse, so not being capable of measuring this two beams femto-second laser pulse Nonoverlapping target range exists in large-scale " dead zone ".
The method of asynchronous-sampling can solve the problem of " dead zone " a wide range of in femtosecond laser ranging, i.e., using two presence The femto-second laser of small repetition difference generates two column femto-second laser pulses, wherein a laser as signal source output measurement with Reference pulse sequence, another output sampling pulse sequence measure light pulse and reference pulse respectively from target mirror and reference mirror Beam is closed with sampling pulse after reflection, time domain broadening is carried out by the asynchronous-sampling process between pulse, and then calculate target Absolute distance information.There are two types of the asynchronous-sampling modes of round trip flight second laser ranging system, i.e., linear asynchronous sampling and it is non-linear different Step sampling.Round trip flight second laser ranging system based on linear asynchronous sampling generates sampled signal, sampling letter by way of interference Number resolution ratio dependent on the coherence between two sets femtosecond pulse sequences, it is therefore desirable to this is locked by the phase-locking device of complexity The repetition rate and carrier envelope phase offset of two lasers.Round trip flight second laser ranging system based on non-linear asynchronous-sampling Intensity cross-correlated signal is generated by measurement light and local oscillator light and frequency, but when detecting longer-distance noncooperative target, by Cause extremely low with frequency signal transformation efficiency in echo optical signal is extremely weak, seriously affecting measurement accuracy or even can not detect.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, provides a kind of based on the double comb femto-second lasers of separate unit Noncooperative target range-measurement system, it is multiple in linear Asynchronous sampling system which can save traditional double femto-second lasers Miscellaneous phase-locking device receives faint target diffusing reflection light echo by large aperture telescope, improves interference signal signal-to-noise ratio in turn Measurement accuracy is improved, while avoiding the measurement error as caused by weak heliogram in non-linear asynchronous-sampling.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of noncooperative target range-measurement system based on the double comb femto-second lasers of separate unit, including the double comb femtosecond lasers of separate unit Device, the double comb femto-second lasers of the separate unit are by pumping source, wavelength division multiplexer, Polarization Controller, carbon nano-tube film, optical fiber polarisation Beam splitter, polarization maintaining optical fibre, coupling follower, isolator and Er-doped fiber composition, noncooperative target range-measurement system further include filtering It is device, first collimator, the first half-wave plate, the first polarization beam splitter prism, the second half-wave plate, the second polarization beam splitter prism, silver-plated Reflecting mirror, avalanche photodetector, data acquisition device, computer, frequency counter, amplification and filter, Polarization Control Device, the second collimator, third half-wave plate, third collimator, applies card telescope, third polarization beam splitting rib at fibre optic polarizing beam splitter Mirror and the 4th half-wave plate；The double comb femto-second lasers of the separate unit export the measurement light and local oscillator light of different central wavelengths, wherein originally Vibration light is divided into two-way after the filter, wherein local oscillator light successively passes through the first collimator, the first half-wave all the way Piece, the first polarization beam splitter prism, the second half-wave plate, the second polarization beam splitter prism, silvered mirror, avalanche photodetector, number According to acquisition device and computer, another way local oscillator light successively passes through the frequency counter and computer；
Light is measured successively by the amplification and filter, Polarization Controller and fibre optic polarizing beam splitter, the optical fiber Polarization beam apparatus output polarization state is mutually perpendicular to and intensity is than adjustable reference light and target light, and reference light successively passes through the second standard Enter in third polarization beam splitter prism after straight device, third half-wave plate, target light is overflow after the outgoing of third collimator by object to be measured Reflection is received by the target light after object to be measured diffusing reflection using card telescope is applied, after applied card telescope and be output and then enter In third polarization beam splitter prism and with reference combiner, by the 4th half-wave plate in the first polarization after reference light and target combiner At beam splitter prism, after the second half-wave plate and the second polarization beam splitter prism, reference light and target light respectively with local oscillator light with Local oscillator combiner simultaneously interferes.
It further, include first stage amplifier, filter and two-stage amplifier in the amplification and filter.
Further, the side applied card telescope and be set to the third polarization beam splitter prism, third collimator and It is described that apply card telescope parallel but not coaxial.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
1, traditional linear asynchronous sampling system is needed by two femto-second lasers of complicated phase-locking device as light source. And present system introduces the double comb femto-second lasers of separate unit as ranging light source, two sets of femtosecond mode locking pulses that it is generated share one A laser cavity, eliminates the influence of the common-mode noises such as external environment variation, and coherence keeps away compared with two independent femtosecond laser source strengths Complicated phase-locking device is exempted from, has been very suitable to apply in noncooperative target range-measurement system.
2, the transmitting of light is measured in cooperative target range-measurement system and is received all is completed by a collimator, and noncooperative target Can diffusing reflection measure light, if continue using collimator as measure light reception device, the measurement light received by it is micro- its It is micro- so that it cannot being detected by avalanche photodetector.Introduce the bigbore reception dress for applying card telescope as measurement light It sets, measurement light light echo power is improved by expanding reception light area, avalanche photodetector can not only be made to detect measurement light Heliogram, moreover it is possible to improve interference signal signal-to-noise ratio.The promotion of signal-to-noise ratio can make subsequent data processing more accurate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of range-measurement system of the present invention.
Fig. 2 is the structural schematic diagram of the double comb femto-second lasers of separate unit.
Appended drawing reference: the double comb femto-second lasers of 1- separate unit；2- filter；3- first collimator；The first half-wave plate of 4-；5- Amplification and filter；6- Polarization Controller；7- fibre optic polarizing beam splitter；The second collimator of 8-；9- third half-wave plate；10- Three collimators；11- applies card telescope；12- third polarization beam splitter prism；The 4th half-wave plate of 13-；The first polarization beam splitter prism of 14-； The second half-wave plate of 15-；The second polarization beam splitter prism of 16-；17- silvered mirror；18- avalanche photodetector；The acquisition of 19- data Device；20- computer；21- frequency counter；22- pumping source；23- wavelength division multiplexer；24- Polarization Controller；25- carbon nanometer Pipe film；26- fibre optic polarizing beam splitter；27- polarization maintaining optical fibre；28- couples follower；29- isolator；30- Er-doped fiber
Specific embodiment
The invention will be further described with reference to the accompanying drawing.
The femto-second laser of two traditional stand lock phase bits is replaced in the present embodiment with the double comb femto-second lasers 1 of separate unit；With Apply card telescope and replace while receiving and dispatching the collimator of target light, thus can with simple optical path measurement noncooperative target away from From, while high measurement accuracy is kept, wherein the principle measured is linear asynchronous sampling principle, detailed calculating process is as follows:
Measurement light, repetition f are denoted as with reference to a set of femtosecond mode locking pulse with target range by being used to detectr1；It will be used for Local oscillator light, repetition f are denoted as to the another set of femtosecond mode locking pulse for measuring actinic asynchronous-samplingr2, their repetition difference Δ fr= fr2-fr1For definite value, repetition is observed in real time and only needs to observe fr2?.Measurement light pulse sequence time domain interval is Tr1=1/fr1, Local oscillator light pulse sequence time domain interval is Tr2=1/fr2.It is assumed that carving at the beginning, local oscillator light pulse and measurement light pulse are completely heavy Merge interference, since the two has repetition difference Δ fr, every to pass through a pulse period, measurement light pulse can be generated with local oscillator light pulse One time difference Δ Tr=Tr1-Tr2, i.e., next measurement light pulse will be relative to local oscillator light pulse Forward Δ Tr.By n times line Property asynchronous-sampling after, n-th pulse of the N+1 pulse of local oscillator light pulse just with measurement light pulse is completely coincident and does It relates to, completes primary complete linear asynchronous sampling, used time Tupgrade=1/ Δ fr.Δ T should be met in sampling processrMuch smaller than arteries and veins Wide τ, i.e. Δ frMuch smaller than fr1And fr2, guarantee the original signal for thering are enough sampled points to restore measurement light pulse.It is calculating In, use fr=fr2Instead of fr1And fr2, use Tr=Tr2Instead of Tr1And Tr2.After primary complete linear asynchronous sampling, sampling letter It number is the equivalent measurement light pulse sequence for being broadened N times in the time domain.Wherein N meets
Since measurement light pulse and local oscillator optical pulse time domain envelope shape are all Gaussians, theoretically asynchronous-sampling generates dry The envelope for relating to signal is all Gaussian, can seek intermediate value with the interference signal envelope that computer gets scanning, extract mesh Mark the time point T of light equivalent signaltarAnd the time point T of reference light equivalent signalref.Measuring signal and reference after asynchronous-sampling The time difference of signal is Ttr=Ttar-Tref.Since pulse is amplified N times in asynchronous-sampling, true measuring signal and reference are believed Number time difference be tTr=Ttr/N.If air refraction is ng, testing distance L is expressed as
As shown in Fig. 2, the double comb femto-second lasers 1 of separate unit involved in this patent are according to article Asynchronous and synchronous dual-wavelength pulse generation in a passively mode-locked fiber Laser with a mode-locker (1 2017/Optics Letters of Vol.42, No.23/December) and build, Pumping source 22 provides 980nm wave band backward pumping light in the present embodiment, and is coupled in optical path by wavelength division multiplexer 23, makes to mix Er ion in erbium optical fiber 30 generates stimulated radiation, and radiant light is along the direction (counter clockwise direction) of isolator 29 in intracavitary biography It is defeated.Carbon nano-tube film 25 is used as saturable absorber, realizes Mode-locking For Lasers operating.Light arteries and veins in 24 adjusting cavity of Polarization Controller The polarization state of punching is λ with fibre optic polarizing beam splitter 26,27 collective effect core out wavelength of polarization maintaining optical fibre1=1530nm and λ2= The femtosecond mode locking pulse of two wave bands of 1555nm, repetition fr1And fr2About 50MHz, after being entered by the coupling output of follower 28 Continuous optical path.
The double comb femto-second lasers 1 of this separate unit can directly export that coherence is fabulous and two sets of femtoseconds with small repetition difference Mode locking pulse.The Lyot filter effect of intracavitary birefringent introducing makes laser output light spectrum, in sinusoidal variations, receive in carbon with wavelength Under the saturable absorption effect of mitron film, laser realizes dual wavelength mode locking, and mode locking central wavelength is located at Lyot filter curve At maximum value.The intracavitary birefringent polarization maintaining optical fibre for depending on one section of specific length, spectral filtering period can be by changing polarization-maintaining light Fine length is adjusted.Such as polarization maintaining optical fibre length be 0.25m when, Lyot filter effect make laser output light spectrum exist It is maximum value at 1530nm and 1550nm, laser is 1530nm and 1550nm at while mode locking.Laser resonator light path is about For 6m, corresponding femtosecond mode locking pulse sequence repetition rate is about 50MHz.Under the influence of intracavitary net negative dispersion, central wavelength Optical path of resonator positioned at the femtosecond mode locking pulse sequence of 1530nm and 1550nm is slightly different, repetition difference Δ frAbout 2kHz. This two sets of femtosecond mode locking pulses share the same laser cavity, eliminate the influence of the common-mode noises such as external environment variation, coherence Compared with two independent femtosecond laser source strengths, complicated phase-locking device is avoided, system structure is greatly simplified.
It is as shown in Figure 1 noncooperative target range-measurement system schematic diagram of the present invention；The range-measurement system includes the double comb femtoseconds of separate unit Laser 1, filter 2, first collimator 3, the first half-wave plate 4, the first polarization beam splitter prism 14, the second half-wave plate 15, Two polarization beam splitter prisms 16, silvered mirror 17, avalanche photodetector 18, data acquisition device 19, computer 20, frequency meter Number devices 21, amplification and filter 5, Polarization Controller 6, fibre optic polarizing beam splitter 7, the second collimator 8, third half-wave plate 9, the Three collimators 10 apply card telescope 11, third polarization beam splitter prism 12 and the 4th half-wave plate 13；
The double comb femto-second lasers 1 of separate unit can be λ with output center wavelength1And λ2Two sets of femtosecond mode locking pulses, two sets of pulses Repetition difference between sequence is Δ fr=2kHz.The central wavelength of filter 2 is 1550nm, and full width at half maximum 1.6nm filters out λ2 The part light of wave band；Similarly, λ1Band of light by amplification and filter 5 after generate light intensity enough, central wavelength 1550nm, The part light that bandwidth is 1.6nm is sampled for subsequent linear asynchronous, includes first stage amplifier, filtering in amplification and filter 5 Device and two-stage amplifier.Fibre optic polarizing beam splitter 7, the second collimator 8, third collimator 10 are beamed into reference light for light is measured And target light, card telescope 11, third polarization beam splitter prism 12 are applied by reference light and target combiner.Wherein third collimator 10 The emitting stage and receiver stage that card telescope 11 is respectively target light are applied with third.21 real-time monitoring λ of frequency counter2The weight of wave band Complex frequency avoids influence of the repetition rate long term drift to measurement accuracy.
As previously mentioned, the double comb femto-second lasers 1 of separate unit export λ1And λ2The femtosecond mode locking pulse sequence of two kinds of central wavelength, They respectively correspond measurement light and local oscillator light.Light is measured after the first stage amplifier in amplification and filter 5 due to non-thread Property effect causes spectrum to be widened, to generate the component of 1550nm wave band.By amplification and filter 5 in optical fiber circulator with The measurement light that the filter of reflective Bragg grating composition filters out central wavelength in 1550nm and bandwidth is about 1.6nm, most Afterwards by the two-stage amplifier in amplification and filter 5 by its power amplification.Amplified measurement light passes through Polarization Controller 6 It is mutually perpendicular to 7 output polarization state of fibre optic polarizing beam splitter and intensity is than adjustable reference light and target light, wherein weaker one Shu Zuowei reference light is exported from the second collimator 8, and the third polarization beam splitter prism for closing Shu Zuoyong has been entered by third half-wave plate 9 In 12；Another beam measurement light is emitted target light by third collimator 10, is connect after target diffusing reflection using applying card telescope 11 It receives.Focal length, spatial position, pitching and the level angle for adjusting telescope are coupled back into target light in third polarization beam splitter prism 12 And with reference combiner.The mirror-reflection for applying card telescope 11 in order to prevent interferes target light echo, and measurement light is beaten to mesh It is parallel but not coaxial that target transmitting terminal --- receiving end of third collimator 10 and reception target light echo --- applies card telescope 11. After reference light and target combiner by the 4th half-wave plate 13 at the first polarization beam splitter prism 14 with local oscillator combiner, using Second half-wave plate 15 and the second polarization beam splitter prism 16, reference light and target light are interfered with local oscillator light respectively.
Local oscillator light, which is directly over, filters out middle cardiac wave by the filter 2 that optical fiber circulator and reflective Bragg grating form The light component that in 1550nm and bandwidth is about 1.6nm is grown, which exports by first collimator 3, by the first half Wave plate 4 changes its polarization state, beam is closed at the first polarization beam splitter prism 14 with reference light, target light, using the second half-wave plate 15 and second after polarization beam splitter prism 16, and local oscillator light, reference light, target light are adjusted to identical polarization state and generate interference, this The namely process of linear asynchronous sampling.
Filter in filter 2, amplification and filter 5 limits spectral width to make linear asynchronous sample Meet nyquist sampling theorem, avoids the generation of aliasing.First half-wave plate 4, third half-wave plate 9, the 4th half-wave plate 13, Second half-wave plate 15 combines third polarization beam splitter prism 12, the first polarization beam splitter prism 14, the second polarization beam splitter prism 16 can be with The light intensity ratio for further adjusting reference light, target light and local oscillator light, has when reference light, target light are identical with local oscillator luminous intensity There is optimal interference effect.
Interference light is received by avalanche photodetector 18 after reflecting via silvered mirror 17 and is converted into electric signal.Electric signal Sampled data is acquired in real time by data acquisition device 19, local oscillator light repetition frBy 21 real-time measurement of frequency counter, finally via Computer 20 carries out carrier wave, sieve point, the calculating such as Gauss curve fitting analyze to obtain measuring signal and reference signal after asynchronous-sampling Time difference Ttr, in known air refractive index ngIn the case where obtain real-time target absolute distance by relational expression (2).
Specifically, applying card telescope 11 involved in this patent is Schmidt-Cassegrain telescope (model Celestron C5 referred to as applies card telescope), bore 125mm, relatively collimating device has the faint diffusing reflection of stronger collection target The ability of light.Apply card telescope focal length for 1250mm, the long 280mm of lens barrel, relatively more with the other types lens cone for telescope of parfocal It is short, to substantially reduce device volume.
The present invention is not limited to embodiments described above.Above the description of specific embodiment is intended to describe and say Bright technical solution of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.

Claims (4)

1. a kind of noncooperative target range-measurement system based on the double comb femto-second lasers of separate unit, including the double comb femto-second lasers of separate unit (1), the double comb femto-second lasers of the separate unit are inclined by pumping source, wavelength division multiplexer, Polarization Controller, carbon nano-tube film, optical fiber Shake beam splitter, polarization maintaining optical fibre, coupling follower, isolator and Er-doped fiber composition, which is characterized in that the noncooperative target is surveyed It further include filter (2), first collimator (3), the first half-wave plate (4), the first polarization beam splitter prism (14), second away from system Half-wave plate (15), the second polarization beam splitter prism (16), silvered mirror (17), avalanche photodetector (18), data acquisition dress Set (19), computer (20), frequency counter (21), amplification and filter (5), Polarization Controller (6), optical fiber polarisation beam splitting Device (7), third half-wave plate (9), third collimator (10), applies card telescope (11), third polarization beam splitting at the second collimator (8) Prism (12) and the 4th half-wave plate (13)；Double combs femto-second laser (1) of the separate unit export different central wavelengths measurement light and Local oscillator light, wherein local oscillator light is divided into two-way after the filter (2), wherein local oscillator light successively passes through described first all the way Collimator (3), the first half-wave plate (4), the first polarization beam splitter prism (14), the second half-wave plate (15), the second polarization beam splitter prism (16), silvered mirror (17), avalanche photodetector (18), data acquisition device (19) and computer (20), another way sheet Vibration light successively passes through the frequency counter (21) and computer (20)；
It measures light and successively passes through the amplification and filter (5), Polarization Controller (6) and fibre optic polarizing beam splitter (7), it is described Fibre optic polarizing beam splitter (7) output polarization state is mutually perpendicular to and intensity is than adjustable reference light and target light, and reference light successively passes through It crosses the second collimator (8), third half-wave plate (9) to enter in third polarization beam splitter prism (12) afterwards, target light is through third collimator (10) it by object to be measured diffusing reflection after being emitted, is received by the target light after object to be measured diffusing reflection using card telescope (11) are applied, After applied card telescope (11) be output and then enter in third polarization beam splitter prism (12) and with reference combiner, reference light and mesh Mark after combiner by the 4th half-wave plate (13) at the first polarization beam splitter prism (14) with local oscillator combiner, using the second half After wave plate (15) and the second polarization beam splitter prism (16), reference light and target light respectively with local oscillator light and interfere.
2. a kind of noncooperative target range-measurement system based on the double comb femto-second lasers of separate unit according to claim 1, feature It is, includes first stage amplifier, filter and two-stage amplifier in the amplification and filter (5).
3. a kind of noncooperative target range-measurement system based on the double comb femto-second lasers of separate unit according to claim 1, feature It is, the side applied card telescope (11) and be set to the third polarization beam splitter prism (12).
4. according to claim 1 or 3 is described a kind of based on the double noncooperative target range-measurement systems for combing femto-second lasers of separate unit, special Sign is, the third collimator (10) with described to apply card telescope (11) parallel but not coaxial.
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CN111007525A (en) * 2019-12-24 2020-04-14 合肥工业大学 Arbitrary absolute distance measuring device based on single-flying-second optical frequency comb balance cross correlation
CN113483880A (en) * 2021-08-17 2021-10-08 广东电网有限责任公司 Vibration sensing system based on few-mode optical fiber
CN114326126A (en) * 2019-05-27 2022-04-12 杭州海康威视数字技术股份有限公司 Exposure apparatus
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