CN106199623A - A kind of femtosecond laser intermode beat frequency method range-measurement system - Google Patents
A kind of femtosecond laser intermode beat frequency method range-measurement system Download PDFInfo
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- CN106199623A CN106199623A CN201610473590.9A CN201610473590A CN106199623A CN 106199623 A CN106199623 A CN 106199623A CN 201610473590 A CN201610473590 A CN 201610473590A CN 106199623 A CN106199623 A CN 106199623A
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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
- G01S17/32—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S17/34—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
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Abstract
The present invention relates to a kind of femtosecond laser intermode beat frequency method range-measurement system, it is characterized in that, this range-measurement system includes femtosecond laser frequency comb, acousto-optic modulator, the first Amici prism, the second Amici prism, the first mechanical shutter, the second mechanical shutter, the first reflecting mirror, the first fibre-coupled mirrors, the second fibre-coupled mirrors, beam expander, corner reflector, the first photodetector, the second photodetector and signal processing system.The present invention uses acousto-optic modulator to realize synthetic wavelength, the range of femtosecond laser intermode beat frequency method is enlarged, vary without cavity length regulation femto-second laser repetition rate during measurement, owing to acousto-optic modulator is automatically controlled device, compare the mechanical delay line of regulation laser resonator cavity length, acousto-optic modulator controller architecture is simple, convenient to operate, and the response device time is short, therefore can be greatly reduced single measurement required time, simplify measuring process, it is achieved convenient quick measurement.
Description
Technical field
The present invention relates to a kind of femtosecond laser absolute distance measurement system, especially with regard to a kind of femtosecond laser intermode beat frequency
Method range-measurement system.
Background technology
Traditional laser distance measurement method includes time-of-flight method, interferometric method, Single wavelength phase method etc..Time-of-flight method is passed through
Measure light turnaround time between light source and target and measure target range, owing to ray velocity is exceedingly fast, the therefore shuttle flight of light
Time is shorter, and certainty of measurement is limited, and the range accuracy causing the method is the highest；Interferometric method can realize the survey of sub-optical wavelength magnitude
Accuracy of measurement, but non-fuzzy distance also must set up guide rail during wavelength magnitude, measurement and carry out uninterrupted increment type measurement, no
Absolute distance measurement can be realized；Single wavelength phase method carries out the amplitude modulation(PAM) of radio band to continuous laser, propagates by measuring light
During modulating wave produce Phase delay resolve distance, the longest then range of modulation wavelength is the biggest, but range accuracy reduce, otherwise
The shortest then precision of modulation wavelength is the highest, but range is the least, and therefore the method cannot take into account wide range and high accuracy.At large scale computer
Range finding occasion required in tool equipment, large aircraft, high-speed railway, civil engineering and satellites formation, reaches micro-to finding range
Rice magnitude, range finding range reaches the ranging technology of km magnitude bigger demand, and above-mentioned three kinds of conventional laser distance-finding methods are equal
It is difficult to meet the demand of range and precision simultaneously.
Along with the development of laser technology, femtosecond laser frequency comb light source appear as large scale high accuracy absolute distance measurement
Bring breakthrough.Femtosecond laser is a kind of pulse width ultra-short pulse laser in femtosecond magnitude, frequency domain is a series of surely
Longitudinal mode spectral line fixed, that be spacedly distributed, adjacent longitudinal mode spacing is referred to as repetition rate, is called for short repetition, with frepRepresent, repetition rate
Typically at tens radio frequency bands arriving hundreds of MHz.Mutually beat can form intermode beats signal between each longitudinal mode of femtosecond laser, clap signal
The frequency content comprised is the positive integer times of repetition rate, utilizes these different frequency contents can carry out multi-wavelength phase method
Range finding, low frequency long wavelength signals can be used for wide range bigness scale, and based on bigness scale result, the long signal of high-frequency short waves can be used for into one
Step improves certainty of measurement, thus can realize high accuracy and wide range simultaneously.The research team of Japan in 2000 first reported
Femtosecond laser frequency comb multi-wavelength interference method range-measurement system and experimental result.Due to femtosecond laser repetition rate tens to hundreds of
MHz, the composition that intermode beat frequency signal intermediate frequency rate is minimum, i.e. frep, the most several meters of the non-fuzzy distance that corresponding wavelength is i.e. measured arrives
Tens meters, if without priori data as reference, the method range is also only capable of reaching tens meters, still can not meet many engineerings
The application scenario demand to km magnitude wide range.
In order to solve the problems referred to above, prior art proposes the method for synthetic wavelength range extension, and the method is by changing
Laser resonance cavity length, carries out minor alteration to femtosecond laser repetition rate, and the repetition rate before and after change forms synthetic wavelength,
Carrying out phase method bigness scale first with synthetic wavelength, recycling intermode beat frequency fado wavelength range finding obtains high accuracy.Due in experiment
Under precision, synthetic wavelength can reach a few km to tens km magnitudes, and program range also extends to km magnitude, i.e. simultaneously
Achieve wide range and high accuracy.But the method needs manual or automatically controlled regulation femtosecond laser resonator cavity delay line length, relates to
And mechanical adjustment, regulation system structure is complex, and regulation required time is long, causes measuring required time long, is unfavorable for quickly
Measure in real time；And the stability of laser instrument may be produced impact during regulating.Additionally at some commercial femtosecond laser frequency
Rate comb light source does not have the function regulating laserresonator in a big way, cannot realize composite wave regular way the most yet and expand femtosecond
Laser intermode beat frequency method range finding range.
Summary of the invention
For the problems referred to above, it is an object of the invention to provide one and vary without femto-second laser repetition rate, be not required to adjust
Mechanical delay line length in joint laserresonator, measurement scheme is easy, little on laser stability impact, it is possible to realize quickly
The femtosecond laser intermode beat frequency method range-measurement system measured.
For achieving the above object, the present invention takes techniques below scheme: a kind of femtosecond laser intermode beat frequency method range-measurement system,
It is characterized in that, this range-measurement system include femtosecond laser frequency comb, acousto-optic modulator, the first Amici prism, the second Amici prism,
First mechanical shutter, the second mechanical shutter, the first reflecting mirror, the first fibre-coupled mirrors, the second fibre-coupled mirrors, beam expander, angle
Reflecting mirror, the first photodetector, the second photodetector and signal processing system；Described femtosecond laser frequency comb will send
Frequency comb is transmitted into described acousto-optic modulator；The 0 order diffraction light being modulated without described acousto-optic modulator is through some reflecting mirrors
Being transmitted into described first Amici prism after reflection, the frequency of 0 order diffraction light is identical with the light frequency of described femtosecond laser frequency comb；
The 1 order diffraction light modulated through described acousto-optic modulator reflexes to described first light splitting rib with certain modulation angle through a reflecting mirror
Mirror, 0 order diffraction light and 1 order diffraction light are divided into two-beam after closing light at described first Amici prism, close 0 order diffraction before light
The light path of light and 1 order diffraction light is identical, and the wherein light beam in two-beam is transmitted into described first fibre-coupled mirrors as fixing
The reference arm light path of length, the reference light received is passed through a fibre optical transmission to described first photoelectricity by described first fibre-coupled mirrors
Detector；Another bundle light emission in two-beam to described second Amici prism, a branch of through described second Amici prism outgoing
Light is transmitted into described first reflecting mirror monitoring arm light path as regular length through described first mechanical shutter, through described first anti-
The monitoring light penetrating mirror reflection returns described second Amici prism according to original optical path；Another bundle through described second Amici prism outgoing
Light is transmitted into the described corner reflector being fixedly installed on object under test as treating after described second mechanical shutter and beam expander
Find range from measurement arm, the measurement light reflected through described corner reflector returns described second Amici prism according to original optical path, described
Second Amici prism will monitoring light or measure light by described second fibre-coupled mirrors through a fibre optical transmission to described second photoelectricity
Detector；The signal detected is sent to described signal processing system by described first photodetector and the second photodetector
System.
Preferably, described signal processing system includes two signal sources, four low pass filters, two gain amplifiers, locks
Phase amplifier, a computer and a shutter controller；The outfan of described first photodetector and the second photodetector divides
Not connecting the input of a frequency mixer, another input of frequency mixer described in two is all connected with described first signal source, and described first
Signal source outfan connects described computer, and the outfan of frequency mixer described in two amplifies through the first low pass filter, gain respectively
Device and the second low pass filter are connected in parallel the input of described lock-in amplifier, and the outfan of described lock-in amplifier is through a number
Connecting described computer according to harvester, it is fast that described computer controls described first machinery respectively also by described shutter controller
Door and the opening and closing of the second mechanical shutter；The input in described secondary signal source connects described computer, described second letter
The outfan in number source connects described acousto-optic modulator.
Due to the fact that and take above technical scheme, it has the advantage that 1, the present invention uses acousto-optic modulator shift frequency
Realize synthetic wavelength to measure, it is not necessary to change the mechanical delay line length in femto-second laser repetition rate and regulation laserresonator
Degree, light path and circuit structure are simple, and in system, femto-second laser only needs to lock repetition rate, are not required to lock carrier envelope offset frequency
Rate is low to the control difficulty of frequency comb, it is possible to achieve quickly to measure, within single measurement required time can reach 1s.2, this
Bright realize synthetic wavelength by acousto-optic modulator, the range of femtosecond laser intermode beat frequency method is enlarged, during measurement not
Cavity length regulation laser instrument repetition rate need to be changed；Owing to acousto-optic modulator is automatically controlled device, compare regulation laser instrument humorous
Shake the mechanical delay line of cavity length, and acousto-optic modulator controller architecture is simple, it is simple to operation, and the response device time is short, therefore
Single measurement required time can be greatly reduced, simplify measuring process, it is achieved convenient quick measurement.3, asymmetric due to Circuits System
Drift can cause phase measurement to drift about, and the present invention uses monitoring arm light path cooperative mechanical shutter alternately handover measurement mode to disappear
Except phase measurement is drifted about, it is possible to achieve high-precision phase measurement, improve certainty of measurement.4, the present invention utilizes electricity heterodyne method
High-frequency oscillation signal is reduced to low frequency signal, the phase place of high-acruracy survey high-frequency oscillation signal, it is achieved ranging phase method；It addition,
Use synthetic wavelength method to obtain to find range greatly range, it is achieved range reaches km magnitude, precision reaches the absolute distance of micron dimension and surveys
Amount.The present invention can be widely applied in femtosecond laser absolute distance measurement.
Accompanying drawing explanation
Fig. 1 is the range-measurement system structural representation of the present invention；
Fig. 2 is the signal processing system principle schematic of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is carried out detailed description.It should be appreciated, however, that being provided only more of accompanying drawing
Understanding the present invention well, they should not be interpreted as limitation of the present invention.
As it is shown in figure 1, the present invention provide femtosecond laser intermode beat frequency method range-measurement system, including femtosecond laser frequency comb L,
Collimating lens N, acousto-optic modulator AOM, the first Amici prism BS1, the second Amici prism BS2, the first mechanical shutter S1, the second machine
Tool shutter S2, reflecting mirror M1, the first fibre-coupled mirrors D1, the second fibre-coupled mirrors D2, beam expander K, corner reflector C, the first photoelectricity
Detector PD1, the second photoelectric detector PD2And signal processing system.
The centre wavelength sent is 1560nm by femtosecond laser frequency comb L, repetition rate be 56.27MHz (as example,
Be not limited to this) frequency comb be transmitted into acousto-optic modulator AOM via after a fiber-optic transfer to collimating lens N；
The 0 order diffraction light being modulated without acousto-optic modulator AOM is sent out after some reflecting mirror (not shown)s reflect
It is mapped to the first Amici prism BS1, the frequency of 0 order diffraction light is identical with the light frequency of femtosecond laser frequency comb；
After acousto-optic modulator AOM, 1 order diffraction light of modulation reflexes to first point with certain modulation angle through a reflecting mirror
Light prism BS1, 0 order diffraction light and 1 order diffraction light are at the first Amici prism BS1Place is divided into two-beam after closing light (needs ensure to close light
0 order diffraction light and the light path of 1 order diffraction light before are identical, and specifically used process can carry out light by using some reflecting mirrors
The regulation of journey, does not repeats them here), wherein light beam is through the first fibre-coupled mirrors D1As the reference arm light path of regular length,
First fibre-coupled mirrors D1By reference light by a fibre optical transmission to the first photoelectric detector PD1, another restraints light emission to second point
Light prism BS2, through the second Amici prism BS2The light beam of outgoing is through the first mechanical shutter S1It is transmitted into reflecting mirror M1As fixing
The monitoring arm light path of length, is reflected mirror M1The monitoring light of reflection returns the second Amici prism BS according to original optical path2；Through second point
Light prism BS2The another light beam of outgoing is through the second mechanical shutter S2Being transmitted into beam expander K, the light emission after beam expander K expands arrives
The corner reflector C being fixedly installed on object under test presses as the measurement arm of testing distance, the measurement light reflected through corner reflector C
The second Amici prism BS is returned according to original optical path2, the second Amici prism BS2Light will be monitored or measure light by the second fibre-coupled mirrors
D2Through fibre optical transmission to the second photoelectric detector PD2, the first photoelectric detector PD1With the second photoelectric detector PD2By detected
Signal is sent to signal processing system.
As in figure 2 it is shown, signal processing system includes that two signal sources, two frequency mixers, four low pass filters, two gains are amplified
Device, a lock-in amplifier, a computer and a shutter controller；First photoelectric detector PD1With the second photoelectric detector PD2's
Outfan connects an input of a frequency mixer HP respectively, and another input of two frequency mixer HP is all connected with the first signal source SN1,
The outfan of the first signal source SN1 connects computer, and the frequency of the first signal source SN1 output signal is controlled by computer
System, the outfan of two frequency mixer HP is respectively through the first low pass filter LB1, gain amplifier FD and the second low pass filter LB2
Being connected in parallel the input of lock-in amplifier RS, the outfan of lock-in amplifier RS connects computer through a data acquisition unit,
Lock-in amplifier RS is carried out computer data acquisition and parameter is controlled.Computer is controlled respectively also by shutter controller
Make the first mechanical shutter S1With the second mechanical shutter S2Opening and closing；The input of secondary signal source SN2 connects computer,
The outfan of secondary signal source SN2 connects acousto-optic modulator AOM, and computer is by controlling output or the pass of secondary signal source SN2
Close to start or close acousto-optic modulator AOM.
The femtosecond laser intermode beat frequency method range-measurement system of the present invention in distance measurement process, the first mechanical shutter S1With
Two mechanical shutter S2The most alternately open, measure the phase contrast of monitoring arm and reference arm respectivelyMeasure arm and reference arm
Phase contrastOwing to reference arm and monitoring arm are regular length, and measure arm and share measuring circuit with monitoring arm,Change can reflect due to the first photoelectric detector PD1With the second photoelectric detector PD2And electricity in connection
The phase difference measurements that road causes drifts about or shake.Owing to circuit drift speed is far below mechanical shutter switch speed, permissible
ThinkWithTo measure for circuit drift be simultaneously, the most desirableMake
For phase difference measurements, to eliminate the impact for range measurement of circuit drift or jitter error.
The femtosecond laser intermode beat frequency method range-measurement system using the present invention measures process and can be divided into two testing distance
Step:
1, computer starting secondary signal source SN2 driving acousto-optic modulator AOM, 0 order diffraction light and 1 order diffraction actinic light,
First photoelectric detector PD1With the second photoelectric detector PD2The signal of telecommunication of output is except mfrepOutside intermode beat frequency composition, also include two
Order diffraction light mutual beat gained composition ± fAOM+mfrep, when choosing suitable fAOMTime, these compositions will have one and be much smaller than
frepLow-frequency component fs, such as frepF is taken during=56.27MHzAOM=168.61MHz, then the first photoelectric detector PD1With the second light
Electric explorer PD2Output signal has fsThe low-frequency component of=0.2MHz, this frequency content corresponding wavelength is much larger than frequency comb fundamental frequency
Wavelength.Low pass filter is detected phase contrast by lock-in amplifier after leaching this low frequency composition signal, it is thus achieved that range measurement knot
Fruit is as bigness scale result.
2, computer control is closed secondary signal source SN2, acousto-optic modulator AOM and is not produced 1 order diffraction light.Now two photoelectricity
The signal of telecommunication of detector output comprises sharp frequency comb intermode Beat Signal first-harmonic and some higher harmonic component mfrep, the frequency spectrum upper limit
Limited by photodetector bandwidth.Femtosecond laser intermode beats signal component frequency is high, and frequency interval is little, it is difficult to pass through low-pass filtering
Device directly leaches a certain composition and measures phase contrast, it is therefore desirable to use heterodyne measurement method, is measuring mfrepHarmonic components
During phase contrast, adopting the first signal source of computerizeing control and producing frequency is mfrepThe sinusoidal signal of+Δ f, respectively with two photoelectricity
The output signal mixing of detector, mixer output signal will be containing Δ f low-frequency component.When defeated to two frequency mixers of the first signal source
Enter signal phase equal time, two mixer output signals remain the phase information of two photo detector signal, can pass through
Low pass filter leaches and is detected phase contrast by lock-in amplifier.
The measurement of the femtosecond laser intermode beat frequency method range-measurement system of the present invention is described in detail below by specific embodiment
Journey:
1, adding frequency on acousto-optic modulator AOM is fAOMModulated signal, produce synthetic wavelength λs=c/nfs, measure this
Reference light and the phase contrast of measurement light under wavelength, it is thus achieved that bigness scale result D ', detailed process is:
Computer controls to start secondary signal source SN2 and drives acousto-optic modulator AOM, has suitably at acousto-optic modulator AOM
Frequency is fAOMDuring signal modulation, the frequency content of the two photodetector signals of telecommunication has one much smaller than frepLow-frequency component
fs, wavelength X that this frequency signal is correspondings=c/nfsBeing referred to as synthetic wavelength, utilizing synthetic wavelength range finding range is D 'max=λs/2。
Owing to f can be regulatedAOMMake fs<<frep, therefore this range finding range is the biggest.Low pass filter is utilized to leach fsSignal with phase-locked
Amplifier measuring phase contrast, recording testing distance in synthetic wavelength range ability is D ', as coarse range measuring result.In theory
If fsClose to zero, λsJust can approach infinity, range of finding range greatly can be obtained.But in measurement later, in order to correctly
Calculate the fundamental frequency wavelength number complete cycle N comprised in testing distance1, the measured deviation of above-mentioned D ' should have the upper limit.And the λ usedsMore
Greatly, D ' measurement error is the biggest, is therefore limited to measurement error, and range is D 'max=λs/ 2 can not infinitely expand, but general reality
Test and under precision, sufficiently achieve km magnitude.
2, close the modulated signal of AOM on acousto-optic modulator, make only 0 order diffraction light outgoing, regulate the first signal source SN1
Output, make this signal and f=frepFundamental component produce low frequency heterodyne signal, measure reference light and measurement under fundamental frequency wavelength
The phase contrast of light, it is thus achieved that the reference light under fundamental frequency wavelength and measurement light phase level difference measurementsAnd by D ' andDetermine base
Frequently range measurement D1, concrete measuring principle and process be:
Using intermode Beat Signal medium frequency is mfrepThe composition of (m is positive integer) carries out interferometric phase method range finding, records
Reference signal and the phase contrast measured between signal areThen absolute distance measurement result is:
In formula, c is the light velocity in vacuum, and n is air refraction, can be according to the correlation theory of air refraction by ambient parameter
Determine, λ=c/nfrepFor sharp frequency comb fundamental frequency wavelength.The phase contrast recorded due to instrument is in the range of 0～2 π, and range measurement is deposited
Natural number N in fuzzy ranges, formula (1)mRepresent the phase contrast 2 π number of cycles that instrument cannot determine.
After atomic clock locking repetition rate, swash frequency comb repetition rate shake δ frep< 1mHz considers instrumental error
With measurement random error, the measurement error of phase contrastAt 0.01 ° of order of magnitude, repetition rate relative error is surveyed much smaller than phase contrast
Amount relative error, phase difference measurement is main source of error, can obtain range measurement error according to formula (1) and be
The sharp frequency comb intermode difference frequency used of i.e. finding range is the highest, and range error is the least, and precision is the highest.Consider range and essence
Degree, first uses f=f when measuringrepFundamental component carry out wide range bigness scale, now according to synthetic wavelength bigness scale result D ' and base
The lower phase difference measurements of frequencyMeasurement result determines N1, it may be assumed that
Then fundamental frequency range measurement D1It is represented by:
3, regulate the output of the first signal source SN1, make this signal and f=mfrepA certain radio-frequency component produce low frequency heterodyne
Signal, wherein, choosing of positive integer m can determine according to the photodetector bandwidth upper limit used, and measures reference light under this wavelength
With the phase contrast measuring light, it is thus achieved that phase difference measurementsAnd by D1WithMeasurement result determines Nm, and then determine survey
Away from result Dm, it being final measurement, detailed process is:
Use f=mf insteadrepHigher hamonic wave accurately measure, Integer NmBy phase contrastMeasurement result and D1Determine:
Now by the measurement result that formula (1) attainable accuracy is higher:
D is substituted into further according to (3) formula1Measurement result, can obtain range measurements finally:
In above-mentioned each pacing amount, it is possible to use monitoring arm light path and double-shutter switching eliminate circuit drift error, specifically
Principle and data processing method mentioned above, do not repeat them here；Repeatedly survey it addition, can use in above-mentioned each pacing amount
Measure the mode of meansigma methods, reduce the random error in measuring.
The various embodiments described above are merely to illustrate the present invention, and the structure of the most each parts, connected mode and processing technology etc. are all
Can be varied from, every equivalents carried out on the basis of technical solution of the present invention and improvement, the most should not get rid of
Outside protection scope of the present invention.
Claims (2)
1. a femtosecond laser intermode beat frequency method range-measurement system, it is characterised in that this range-measurement system include femtosecond laser frequency comb,
Acousto-optic modulator, the first Amici prism, the second Amici prism, the first mechanical shutter, the second mechanical shutter, the first reflecting mirror,
One fibre-coupled mirrors, the second fibre-coupled mirrors, beam expander, corner reflector, the first photodetector, the second photodetector and letter
Number processing system；
The frequency comb sent is transmitted into described acousto-optic modulator by described femtosecond laser frequency comb；Enter without described acousto-optic modulator
0 order diffraction light of row modulation is transmitted into described first Amici prism, the frequency of 0 order diffraction light and institute after some reflecting mirrors reflect
The light frequency stating femtosecond laser frequency comb is identical；
The 1 order diffraction light modulated through described acousto-optic modulator reflexes to described first light splitting with certain modulation angle through a reflecting mirror
Prism, 0 order diffraction light and 1 order diffraction light are divided into two-beam after closing light at described first Amici prism, 0 grade before closing light is spread out
The light path penetrating light and 1 order diffraction light is identical, and the wherein light beam in two-beam is transmitted into described first fibre-coupled mirrors as solid
The reference arm light path of measured length, the reference light received is passed through a fibre optical transmission to described first light by described first fibre-coupled mirrors
Electric explorer；Another bundle light emission in two-beam is to described second Amici prism, through the one of described second Amici prism outgoing
First mechanical shutter described in Shu Guangjing is transmitted into described first reflecting mirror monitoring arm light path as regular length, through described first
The monitoring light of reflecting mirror reflection returns described second Amici prism according to original optical path；Through another of described second Amici prism outgoing
The described corner reflector conduct being fixedly installed on object under test it is transmitted into after second mechanical shutter described in Shu Guangjing and beam expander
The measurement arm of testing distance, the measurement light reflected through described corner reflector returns described second Amici prism, institute according to original optical path
State second Amici prism will monitoring light or measure light by described second fibre-coupled mirrors through a fibre optical transmission to described second light
Electric explorer；The signal detected is sent to described signal processing system by described first photodetector and the second photodetector
System.
2. a kind of femtosecond laser intermode beat frequency method range-measurement system as claimed in claim 1, it is characterised in that described signal processing
System includes that two signal sources, four low pass filters, two gain amplifiers, a lock-in amplifier, computers and gate soon
Device processed；
The outfan of described first photodetector and the second photodetector connects the input of a frequency mixer respectively, described in two
Another input of frequency mixer is all connected with described first signal source, and described first signal source outfan connects described computer, and two
The outfan of described frequency mixer is connected in parallel described respectively through the first low pass filter, gain amplifier and the second low pass filter
The input of lock-in amplifier, the outfan of described lock-in amplifier connects described computer through a data acquisition unit, described
Computer controls described first mechanical shutter and the opening and closing of the second mechanical shutter respectively also by described shutter controller；
The input in described secondary signal source connects described computer, and the outfan in described secondary signal source connects described acousto-optic modulation
Device.
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Cited By (2)
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| CN108732580A (en) * | 2018-05-30 | 2018-11-02 | 浙江省计量科学研究院 | A kind of absolute distance measurement system and measurement method based on phase method Yu composite wave regular way |
| CN112255640A (en) * | 2020-09-11 | 2021-01-22 | 北京空间机电研究所 | Variable frequency difference laser interference distance measuring device capable of adaptively adjusting optical path |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101446687A (en) * | 2007-11-28 | 2009-06-03 | 中国科学院工程热物理研究所 | Collinear femto-second laser polarized pump detecting system |
| CN103197322A (en) * | 2013-04-10 | 2013-07-10 | 清华大学 | Ranging method and ranging system of femtosecond laser frequency comb synthesis wave interference |
| CN103364775A (en) * | 2013-06-25 | 2013-10-23 | 清华大学 | Optical frequency comb calibration-based dual-color laser scanning absolute distance measuring device and method |
| CN103837077A (en) * | 2014-03-21 | 2014-06-04 | 清华大学 | Composite wave interferometry ranging distance system with two femtosecond laser frequency combs |
| KR101448831B1 (en) * | 2013-04-16 | 2014-10-16 | 국방과학연구소 | Distance measuring apparatus using phase-locked synthetic wavelength interferometer based on femtosecond laser |
-
2016
- 2016-06-24 CN CN201610473590.9A patent/CN106199623B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101446687A (en) * | 2007-11-28 | 2009-06-03 | 中国科学院工程热物理研究所 | Collinear femto-second laser polarized pump detecting system |
| CN103197322A (en) * | 2013-04-10 | 2013-07-10 | 清华大学 | Ranging method and ranging system of femtosecond laser frequency comb synthesis wave interference |
| KR101448831B1 (en) * | 2013-04-16 | 2014-10-16 | 국방과학연구소 | Distance measuring apparatus using phase-locked synthetic wavelength interferometer based on femtosecond laser |
| CN103364775A (en) * | 2013-06-25 | 2013-10-23 | 清华大学 | Optical frequency comb calibration-based dual-color laser scanning absolute distance measuring device and method |
| CN103837077A (en) * | 2014-03-21 | 2014-06-04 | 清华大学 | Composite wave interferometry ranging distance system with two femtosecond laser frequency combs |
Non-Patent Citations (2)
| Title |
|---|
| S. HYUN等: "Absolute distance measurement using the frequency comb of a femtosecond laser", 《CIRP ANNALS - MANUFACTURING TECHNOLOGY》 * |
| 王国超等: "光梳多波长绝对测距的波长选择及非模糊度量程分析", 《光学学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732580A (en) * | 2018-05-30 | 2018-11-02 | 浙江省计量科学研究院 | A kind of absolute distance measurement system and measurement method based on phase method Yu composite wave regular way |
| CN112255640A (en) * | 2020-09-11 | 2021-01-22 | 北京空间机电研究所 | Variable frequency difference laser interference distance measuring device capable of adaptively adjusting optical path |
| CN112255640B (en) * | 2020-09-11 | 2023-11-10 | 北京空间机电研究所 | Variable-frequency differential laser interference ranging device capable of adaptively adjusting light path |
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