CN209167339U - A kind of all -fiber chirped pulse speed measuring device - Google Patents
A kind of all -fiber chirped pulse speed measuring device Download PDFInfo
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- CN209167339U CN209167339U CN201920062327.XU CN201920062327U CN209167339U CN 209167339 U CN209167339 U CN 209167339U CN 201920062327 U CN201920062327 U CN 201920062327U CN 209167339 U CN209167339 U CN 209167339U
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Abstract
The utility model discloses a kind of all -fiber chirped pulse speed measuring devices, including super continuum light fibre laser, filter, fibre optic isolater, circulator I, chirped fiber grating, fiber optic splitter, fiber delay line, optical-fiber bundling device, circulator II, fibre-optical probe, fiber amplifier, fiber spectrometer；The super continuum light fibre laser, filter, fibre optic isolater and circulator I are sequentially connected, circulator I is connect with chirped fiber grating and fiber optic splitter, fiber optic splitter passes through fiber delay line respectively and connects optical-fiber bundling device with optical patchcord, circulator II is separately connected optical-fiber bundling device, fibre-optical probe and fiber amplifier, and fiber amplifier connects fiber spectrometer.The speed measuring device structure is simple, is easy to debug, and uses the speed of device measurement high-speed motion body, time resolution can achieve picosecond magnitude, and its light path design help to obtain the higher data of signal-to-noise ratio, by data can direct reconstructed velocity signal, improve rate accuracy.
Description
Technical field
The utility model relates to a kind of laser testing devices, and in particular to a kind of all -fiber chirped pulse speed measuring device.
Background technique
Material kinetics response characteristic research under strong shock wave effect is one of forward position physics project, wherein utilizing Gao Gong
Rate pulse laser metal-loaded material simultaneously carries out high time resolution precise measurement to its free surface velocity profiles and is one important grinding
Study carefully content.Tachometric survey for high-speed motion body, common diagnostic device have the velocity interferometer of any reflecting surface
(VISAR), full optical fiber laser displacement interference instrument (DISAR) and laser Frequency Domain Interferometer, wherein VISAR is using expensive striped
Camera or oscillograph are limited to the time resolution and other factors of these equipment, VISAR is difficult to accomplish as recording equipment
10ps time discrimination measurement below；When DISAR is used to measuring speed signal as a kind of displacement interference instrument, for acceleration
The measurement of very high low speed signal be it is helpless, in addition, it is contemplated that data handling procedure and oscillograph recording equipment,
The time resolution of testing the speed of DISAR is usually not less than 100ps；Laser Frequency Domain Interferometer has unique when measuring high speed signal
Advantage, it can realize that a picosecond time resolution for even subpicosecond magnitude is surveyed as recording equipment using common spectrometer
Amount, is tested the speed, Laser Fusion Research Center, Chinese Academy of Engineering Physics has applied in two based on laser frequency domain interference technique
State's utility model patent: a kind of chirped pulse velocity interferometer (patent No. ZL201310706464.X) and a kind of all -fiber frequency domain
Interferometer (patent No. ZL201420658771.5), still, the former is made of discrete optical element, and system bulk is big, at high cost,
Debugging process is many and diverse, and the record data of the latter are that the reference light separately transmitted by two-way and the signal interference of light obtain, this will
The signal-to-noise ratio of data is reduced, and the displacement derivation operation in data handling procedure makes the speed signal obtained with stronger vibration
It swings, so that the accurate interpretation to speed signal has an adverse effect.
Utility model content
Purpose of the utility model is to solve above-mentioned technical problem, a kind of all -fiber chirped pulse is provided and is tested the speed dress
It sets, which is applied to the tachometric survey of high-speed motion body, and time resolution can achieve picosecond magnitude, and its light path design
Help to obtain the higher data of signal-to-noise ratio, by data can direct reconstructed velocity signal, improve rate accuracy.
To achieve the above object, the technical solution adopted in the utility model is as follows:
A kind of all -fiber chirped pulse speed measuring device, including following fiber optic component and device: super continuum light fibre laser, filtering
Device, fibre optic isolater, circulator I, chirped fiber grating, fiber optic splitter, fiber delay line, optical-fiber bundling device, circulator II,
Fibre-optical probe, fiber amplifier, fiber spectrometer；The super continuum light fibre laser, filter, fibre optic isolater and circulator
I one end is sequentially connected, and the other both ends of circulator I are separately connected the input terminal of chirped fiber grating and fiber optic splitter, light
Two output ends of fine beam splitter pass through two input terminals that fiber delay line connects optical-fiber bundling device with optical patchcord, ring respectively
Three ports of row device II are separately connected the output end, fibre-optical probe and fiber amplifier of optical-fiber bundling device, the fiber amplifier
The other end of device connects fiber spectrometer.
Specifically, all fiber optic component and devices have tail optical fiber, between the tail optical fiber and tail optical fiber, tail optical fiber and optical patchcord it
Between connected by way of ring flange or welding.
Specifically, the operating central wavelength of all fiber optic component and devices and optical patchcord is 1550nm, and bandwidth of operation is not small
In 60nm.
Specifically, the super continuum light fibre laser is pulse laser, the output spectrum model of the pulse laser
It encloses containing 1520~1580nm, and is distributed even cunning in 1520~1580nm of spectral region；The pulse laser can be in simple venation
It rushes under output mode and works.
Specifically, the filter is bandpass filter, and free transmission range is 1520~1580nm, and broadband laser pulse is logical
After crossing the filter, spectral width becomes 1520~1580nm.
Specifically, the chirped fiber grating can broaden in time broadband laser pulse, chirped fiber light
The dispersion that grid introduce is positive dispersion or negative dispersion.
Specifically, the splitting ratio of the fiber optic splitter is 1:1.
Specifically, the delay time of the fiber delay line is continuously adjustable.
Specifically, the fibre-optical probe is optical fiber self-focusing lens stick, probe face sample to be tested surface peace when use
Dress.
Specifically, the data of the fiber spectrometer record are the frequency spectrum interference striped of one-dimensional distribution, interference fringe edge
Spectrum axis direction mechanical periodicity.
Use the method for above-mentioned all -fiber chirped pulse speed measuring device measurement sample surfaces speed: assuming that sample to be tested surface
With a certain speed high-speed motion, two chirped pulses come out from fibre-optical probe are with the successive vertical irradiation of the delay-time difference set
Onto sample surfaces, after being reflected by sample surfaces, the phase for the part reflected light that fibre-optical probe is collected into changes, at this point,
Due to having delay-time difference between two chirped pulses, their phase change and sample surfaces is at delay-time difference both ends
The speed at quarter is corresponding；When frequency spectrum interference occurs in fiber spectrometer for the two chirped pulses and is recorded into interference fringe
Afterwards, static interference striped when reference sample surface does not move, the phase of two chirped pulses can be obtained by data processing
The difference of variable quantity, and the difference of this phase changing capacity is directly proportional to average speed of the sample to be tested surface within delay time, because
This, can be obtained sample surfaces speed multiplied by a coefficient for it.
Its whole flow process is specific as follows: the broadband laser pulse of super continuum light fibre laser output first will by filter
Spectrum is limited in the range of setting, and the laser pulse cut by spectrum enters the of circulator I using fibre optic isolater
A port, fibre optic isolater allows laser unidirectionally to pass through, only to play the role of protecting laser, by the first of circulator I
The broadband laser pulse that a port is entered comes out and enters chirped fiber grating from its second port, and chirped fiber grating will be wide
Band laser pulse is broadened in time, so that it becomes the chirped pulse of setting chirp value, chirped pulse are held by second again
Mouth return circulator I, and fiber optic splitter is output and then enter from third port；Chirped pulse is divided into two by fiber optic splitter
Part, for a portion by entering optical-fiber bundling device after a fiber delay line, another part then passes through one section of optical patchcord
Enter optical-fiber bundling device afterwards, it, will when they are exported from optical-fiber bundling device since the path that two parts chirped pulse is walked is different
With delay-time difference；Circulator is entered successively with certain delay-time difference by the two beam chirped pulses that optical-fiber bundling device comes out
II a port, then comes out from second port of circulator II, enters fibre-optical probe via tail optical fiber, fibre-optical probe is just
Sample to be tested surface is placed, two beam chirped pulses successively come out from fibre-optical probe and vertical irradiation sample tested surface, anti-by it
After penetrating, fibre-optical probe collection part reflected light simultaneously returns to circulator II by second port；The part reflected light being collected is from ring
The third port of row device II successively comes out and enters fiber amplifier, is amplified into fiber spectrometer by fiber amplifier,
Frequency spectrum interference, and the frequency spectrum interference striped generated by spectrometer record will occurs in they inside spectrometer, by dry to frequency spectrum
It relates to striped and carries out data processing, can be obtained the speed history on sample to be tested surface.
Wherein, the delay-time difference and fiber spectrometer record fringe period inversely, the optical fiber
The delayer adjustable delay time difference, therefore the two-way light for entering the optical-fiber bundling device can be changed by control fiber delay line
Delay-time difference between beam, to change the collected interference fringe spacing of fiber spectrometer.The test volume of the utility model
Journey is approximately equal to the pulsewidth of chirped pulse, time resolution by delay-time difference and(τ0Become for the corresponding Fourier of chirped pulse
Change poles limited pulse width, τcFor the pulsewidth of chirped pulse) among the greater determine, can achieve picosecond magnitude.
Compared with prior art, the utility model has the following beneficial effects:
The all -fiber chirped pulse speed measuring device of the utility model has structure simple, is easy to the advantages of debugging, and uses
The speed measuring device is applied in the tachometric survey of high-speed motion body, and time resolution can achieve picosecond magnitude, solve
Current some velocity-measuring system measuring metallic materials inadequate problem of time resolution in the characteristic velocity under light laser loads；This reality
With frequency spectrum interference of the novel data between the comparable chirped pulse of two beam intensities, therefore noise is relatively good, utilizes number
When according to reconstructed velocity signal, process is simply direct, greatly reduces the signal oscillating of data processing introducing, thus just for data
It really interprets and creates condition.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Wherein, the corresponding title of appended drawing reference are as follows:
1, super continuum light fibre laser；2, filter；3, fibre optic isolater；4, circulator I；5, chirped fiber grating；6,
Fiber optic splitter；7, fiber delay line；8, optical-fiber bundling device；9, circulator II；10, fibre-optical probe；11, fiber amplifier；12,
Fiber spectrometer.
Specific embodiment
The utility model is described in further detail with embodiment for explanation with reference to the accompanying drawing, and the mode of the utility model includes
But it is not limited only to following embodiment.
The present embodiment provides a kind of structures, and all -fiber chirped pulse speed measuring device that is simple, being easy to debug should referring to Fig. 1
Speed measuring device includes following fiber optic component and device: super continuum light fibre laser 1, filter 2, fibre optic isolater 3, circulator I 4, Zhou
It sings fiber grating 5, fiber optic splitter 6, fiber delay line 7, optical-fiber bundling device 8, circulator II 9, fibre-optical probe 10, fiber amplifier
Device 11, fiber spectrometer 12；Wherein, super continuum light fibre laser 1 is pulse laser, the output spectrum range of pulse laser
Containing 1520~1580nm, and even cunning is distributed in 1520~1580nm of spectral region；Pulse laser can be exported in pulse
It works under mode.Filter 2 is bandpass filter, and free transmission range is 1520~1580nm, and broadband laser pulse passes through filter
Afterwards, spectral width becomes 1520~1580nm.Fibre optic isolater plays the role of protecting super continuum light fibre laser.Circulator I,
Circulator II is three end circulators.The dispersion that chirped fiber grating 5 introduces is positive dispersion or negative dispersion, chirped fiber grating meeting
Broadband laser pulse is broadened in time, and Fourier transform limit pulse can be broadened and be by chirped fiber grating 5
Linear-chirped-pulse.Fiber optic splitter is 1 × 2 fiber optic splitter, splitting ratio 1:1.The delay time that fiber delay line 7 generates
It is continuously adjustable, the optical path difference between the two-way light beam for entering optical-fiber bundling device is changed by control fiber delay line, to change
The collected interference fringe spacing of fiber spectrometer.Fibre-optical probe 10 is optical fiber self-focusing lens stick, and probe is just treated when use
The installation of sample surface.The data that fiber spectrometer 12 records are the frequency spectrum interference striped of one-dimensional distribution, and interference fringe is along spectrum
Axis direction mechanical periodicity.
The super continuum light fibre laser 1, filter 2, fibre optic isolater 3 and circulator I 4 one end be sequentially connected, ring
The other both ends of row device I 4 are separately connected the input terminal of chirped fiber grating 5 and fiber optic splitter 6, and two of fiber optic splitter 6
Output end passes through two input terminals that fiber delay line 7 connects optical-fiber bundling device 8 with optical patchcord respectively, and the three of circulator II 9
A port is separately connected the output end of optical-fiber bundling device 8, fibre-optical probe 10 and fiber amplifier 11, the fiber amplifier 11
The other end connects fiber spectrometer 12.
Wherein, all fiber optic component and devices have tail optical fiber and FC/APC adapter, pass through optical fiber between FC/APC adapter
Adapter flange connection.The operating central wavelength of all fiber optic component and devices and optical patchcord is 1550nm, and bandwidth of operation is not less than
60nm。
The broadband laser pulse that the purpose of the present embodiment is achieved in that super continuum light fibre laser 1 exports passes through filter
Pulse spectrum is cut to the spectral region of setting by wave device 2, subsequently into fibre optic isolater 3；The width come out from fibre optic isolater 3
Enter a port of circulator I 4 with laser pulse, 3 permission laser of fibre optic isolater unidirectionally pass through, and play protection laser
The effect of device, the broadband laser pulse entered by a port of circulator I 4 come out from its second port and enter chirp
Fiber grating 5, chirped fiber grating 5 broaden broadband laser pulse in time, so that it becomes the Zhou of setting chirp value
It sings pulse, chirped pulse returns to circulator I 4 by second port again, and is output and then enter fiber optic splitter from third port
6；Chirped pulse is divided into two parts by fiber optic splitter 6, and a portion is closed by entering optical fiber after a fiber delay line 7
Beam device 8, another part enter optical-fiber bundling device 8, the road walked by two parts chirped pulse after then passing through one section of optical patchcord
Diameter is different, will have the regular hour poor when they are exported from optical-fiber bundling device 8, this time difference and fiber spectrometer record
Fringe period inversely, by control fiber delay line can change this time difference；Gone out by optical-fiber bundling device 8
The two beam chirped pulses come successively enter a port of circulator II 9 with the regular hour poor (about 2ps), then from belt
Second port of device II 9 comes out, and enters fibre-optical probe 10 via tail optical fiber, and fibre-optical probe face sample to be tested surface is placed, and two
Beam chirped pulse successively comes out from fibre-optical probe and vertical irradiation sample tested surface, after being reflected off, 10 collection portion of fibre-optical probe
Point reflected light simultaneously returns to circulator II 9 by second port, due to the delay-time difference between two beam chirped pulses only have it is several
Picosecond, during this sample to be tested surface variation and its it is limited to the change of reflection of chirped pulse so that being collected by fibre-optical probe
The intensity of the two beam chirped pulses arrived is suitable, to guarantee the contrast of frequency spectrum interference striped data；The part reflection being collected
Light successively comes out from the third port of circulator II 9 and enters fiber amplifier 11, is amplified into light by fiber amplifier
Optical fiber spectrograph 12, frequency spectrum interference will occurs in they inside spectrometer, and the frequency spectrum interference striped generated by spectrometer record passes through
Data processing is carried out to frequency spectrum interference striped, can get the speed history on sample to be tested surface.
The structure of all -fiber chirped pulse speed measuring device of embodiment is described in detail above, in order to better
The measuring principle of the utility model is understood, below by specifically testing the speed to the utility model all -fiber chirped pulse speed speed measuring device
Process is described in detail.
Assuming that two chirped pulses with certain speed high-speed motion, being come out from fibre-optical probe 10 of sample to be tested surface with
On the successive vertical irradiation to sample surfaces of certain delay-time difference, after being reflected by sample surfaces, what fibre-optical probe 10 was collected into
The phase of part reflected light changes, at this point, due to having certain delay-time difference between two chirped pulses, they
Phase change is corresponding in the speed at delay-time difference both ends moment with sample surfaces.When the two chirped pulses are in fiber spectrum
After frequency spectrum interference occurs in instrument 12 and is recorded into interference fringe, static interference striped when reference sample surface does not move leads to
The difference of phase changing capacity of two chirped pulses can be obtained by crossing data processing, and the difference and sample to be tested of this phase changing capacity
Average speed of the surface within delay time is directly proportional, therefore, sample surfaces speed can be obtained multiplied by a coefficient in it.
Using the speed of this method measurement high-speed motion body, time resolution can achieve picosecond magnitude, solve and work as
Preceding some velocity-measuring system measuring metallic materials inadequate problem of time resolution in the characteristic velocity under light laser loads；This is practical
Frequency spectrum interference of the novel data between the comparable chirped pulse of two beam intensities, therefore noise is relatively good, utilizes data
When reconstructed velocity signal, process is simply direct, greatly reduces the signal oscillating of data processing introducing, thus for the correct of data
Interpretation creates condition.
Above-described embodiment is only one of preferred embodiments of the present invention, should not be taken to limit the utility model
Protection scope, as long as the utility model body design thought and mentally make have no the change of essential meaning or profit
Color, it is solved the technical issues of it is still consistent with the utility model, the protection scope of the utility model should all be included in
Within.
Claims (8)
1. a kind of all -fiber chirped pulse speed measuring device, which is characterized in that including following fiber optic component and device: super continuum light fibre laser
Device (1), filter (2), fibre optic isolater (3), circulator I (4), chirped fiber grating (5), fiber optic splitter (6), optical fiber prolong
Slow device (7), optical-fiber bundling device (8), circulator II (9), fibre-optical probe (10), fiber amplifier (11), fiber spectrometer (12)；
The super continuum light fibre laser (1), filter (2), fibre optic isolater (3) and circulator I (4) one end be sequentially connected, ring
The other both ends of row device I (4) are separately connected the input terminal of chirped fiber grating (5) and fiber optic splitter (6), fiber optic splitter
(6) two output ends pass through two input terminals that fiber delay line (7) connects optical-fiber bundling device (8) with optical patchcord respectively,
Three ports of circulator II (9) are separately connected the output end of optical-fiber bundling device (8), fibre-optical probe (10) and fiber amplifier
(11), the other end of the fiber amplifier (11) connects fiber spectrometer (12).
2. a kind of all -fiber chirped pulse speed measuring device according to claim 1, which is characterized in that all fiber optic component and devices
Tail optical fiber is had, is connected by way of ring flange or welding between the tail optical fiber and tail optical fiber, between tail optical fiber and optical patchcord.
3. a kind of all -fiber chirped pulse speed measuring device according to claim 2, which is characterized in that all fiber optic component and devices
Operating central wavelength with optical patchcord is 1550nm, and bandwidth of operation is not less than 60nm.
4. a kind of all -fiber chirped pulse speed measuring device according to claim 3, which is characterized in that the super continuum light is fine
Laser (1) is pulse laser and can work under pulse output mode.
5. a kind of all -fiber chirped pulse speed measuring device according to claim 4, which is characterized in that the filter (2)
For bandpass filter.
6. a kind of all -fiber chirped pulse speed measuring device according to claim 3~5 any one, which is characterized in that institute
Stating chirped fiber grating (5) can broaden broadband laser pulse in time, and the dispersion that chirped fiber grating introduces is
Positive dispersion or negative dispersion.
7. a kind of all -fiber chirped pulse speed measuring device according to claim 6, which is characterized in that the fiber optic splitter
(6) splitting ratio is 1:1.
8. a kind of all -fiber chirped pulse speed measuring device according to claim 7, which is characterized in that the fibre-optical probe
It (10) is optical fiber self-focusing lens stick, probe face sample to be tested surface installation when use.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920062327.XU CN209167339U (en) | 2019-01-15 | 2019-01-15 | A kind of all -fiber chirped pulse speed measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920062327.XU CN209167339U (en) | 2019-01-15 | 2019-01-15 | A kind of all -fiber chirped pulse speed measuring device |
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| Publication Number | Publication Date |
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| CN209167339U true CN209167339U (en) | 2019-07-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114895058A (en) * | 2022-05-20 | 2022-08-12 | 中国工程物理研究院流体物理研究所 | Function-enhanced laser interference speed measurement device and method |
-
2019
- 2019-01-15 CN CN201920062327.XU patent/CN209167339U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114895058A (en) * | 2022-05-20 | 2022-08-12 | 中国工程物理研究院流体物理研究所 | Function-enhanced laser interference speed measurement device and method |
| CN114895058B (en) * | 2022-05-20 | 2023-05-02 | 中国工程物理研究院流体物理研究所 | Function-enhanced laser interference speed measuring device and method |
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