CN205899031U - Interfere system of testing speed - Google Patents
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- CN205899031U CN205899031U CN201620831309.XU CN201620831309U CN205899031U CN 205899031 U CN205899031 U CN 205899031U CN 201620831309 U CN201620831309 U CN 201620831309U CN 205899031 U CN205899031 U CN 205899031U
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Abstract
The utility model provides an interfere system of testing speed belongs to the laser Interferometer technical field that tests the speed. This interfere system of testing speed includes that chirped pulse produces device, an optical fiber dispersion component, detecting device and data processing device. The partly transmission of chirped pulse that chirped pulse produces that the device produces preset pulse width forms reference light to an optical fiber dispersion component, and another part incides the target that awaits measuring, chirped pulse transmission to the optical fiber dispersion component form signal light of the target that awaits measuring reflection. Reference light and pilot light take place to interfere the frequency domain interference signal who forms to get into detecting device after the processing of the pulse broadening of an optical fiber dispersion component, convert the signal of telecommunication into by detecting device and erupt simultaneously and deliver to data processing device. The embodiment of the utility model provides an interfere system of testing speed has reduced the bandwidth requirement who is used for taking notes interference signal's detecting device effectively, has improved the time -resolved and the speed measurement upper limit of system.
Description
Technical field
This utility model is related to laser interference velocity measuring technique field, interferes velocity-measuring system in particular to a kind of.
Background technology
In the research of the loading techniques such as explosive, laser aid, electromagnetic actuator device, need the speed of its driven flyer plates is entered
Row measurement.Laser interference velocity measuring technique has non-cpntact measurement, temporal resolution is high, rate accuracy is high and measurement dynamic range is big
The advantages of, it is widely used in shock wave, detonation involves the tachometric survey of high-speed moving object in short-term.Therefore, laser interference
Velocity measuring technique is a kind of important means of the movement velocity of film flying under Laser Measurement driving or Magnetic driving.Existing laser interference is surveyed
Fast equipment adopts photodetector and oscillograph directly the interference signal carrying velocity information to be recorded to be treated mostly
Survey the speed of object.However, due to being limited by existing photodetector and oscillographic bandwidth, time resolution is difficult to
Improve, the tachometric survey upper limit is relatively low.
Utility model content
In consideration of it, the purpose of this utility model is to provide a kind of interference velocity-measuring system, the time that can effectively improve divides
Distinguish ability and the tachometric survey upper limit.
To achieve these goals, the technical solution adopted in the utility model is as follows:
This utility model embodiment provides a kind of interference velocity-measuring system, including chirped pulse generator, the first optical fiber
Dispersion element, detection device and data processing equipment, the outfan of described chirped pulse generator and described first optical fiber color
The input coupling of scattered element, the outfan of described first fibre-optical dispersion element is coupled with described detection device, and described detection fills
Put and couple with described data processing equipment.The chirped pulse one of the predetermined pulse width that described chirped pulse generator produces
Divide to transmit and form reference light to described first fibre-optical dispersion element, another part incides target to be measured；Described target to be measured is anti-
The chirped-pulse propagation penetrated to described first fibre-optical dispersion element forms flashlight, and described reference light and described flashlight occur dry
Relate to after the pulse stretching through described first fibre-optical dispersion element of the frequency domain interference signal of formation is processed and enter described detection device.
In this utility model preferred embodiment, above-mentioned interference velocity-measuring system also includes optical fiber circulator and optical fiber is visited
Head, described optical fiber circulator includes first port, second port and the 3rd port, the outfan of described chirped pulse generator
Couple with described first port, described fibre-optical probe is coupled with described second port, the input of described first fibre-optical dispersion element
End is coupled with described 3rd port.
In this utility model preferred embodiment, also set between above-mentioned first fibre-optical dispersion element and described detection device
It is equipped with the first optical signal amplifier, the interference signal after the pulse stretching of described first fibre-optical dispersion element output is processed enters institute
State the first optical signal amplifier, after the processing and amplifying through described first optical signal amplifier, enter described detection device.
In this utility model preferred embodiment, above-mentioned chirped pulse generator includes femto-second laser and pulse exhibition
Wide device, the pulse laser that described femto-second laser sends incides described pulse stretcher, the pulse through described pulse stretcher
Broadening forms chirped pulse after processing.
In this utility model preferred embodiment, above-mentioned femto-second laser is femto second optical fiber laser.
In this utility model preferred embodiment, above-mentioned pulse stretcher is the second fibre-optical dispersion element.
In this utility model preferred embodiment, between above-mentioned second fibre-optical dispersion element and described optical fiber circulator also
It is provided with the second optical signal amplifier, the pulse laser that described femto second optical fiber laser sends enters described second fibre-optical dispersion unit
Part, the pulse stretching through described second fibre-optical dispersion element forms chirped pulse after processing, and described chirped pulse enters described the
Two optical signal amplifiers, enter described fiber optic loop by described first port after the processing and amplifying through described second optical signal amplifier
Shape device.
In this utility model preferred embodiment, above-mentioned first fibre-optical dispersion element is long-range single mode fiber.
In this utility model preferred embodiment, above-mentioned first fibre-optical dispersion element is chirped fiber Bragg grating.
In this utility model preferred embodiment, above-mentioned first fibre-optical dispersion element is dispersion compensating fiber.
With respect to existing laser interference speed measuring equipment, the interference velocity-measuring system that this utility model embodiment provides passes through Zhou
The chirped pulse that pulse generating device of singing produces, as light source, enters detection device in the frequency domain interference signal carrying velocity information
Before, the frequency that time-stretching reduces frequency domain interference signal is carried out to described frequency domain interference signal by the first fibre-optical dispersion element
Rate, thus significantly reducing the bandwidth requirement to the detection device for recording this interference signal, improve this interference and testing the speed
The time resolution of system and the tachometric survey upper limit.For example, 1ps be can achieve very with the detector of 12.5ghz bandwidth and oscillograph
To lower sampling interval, the tachometric survey of achievable more than 100km/s.
Brief description
In order to be illustrated more clearly that the technical scheme of this utility model embodiment, below will be to use required in embodiment
Accompanying drawing be briefly described it will be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore should be by
Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used
To obtain other related accompanying drawings according to these accompanying drawings.
Fig. 1 shows a kind of structural representation of interference velocity-measuring system that this utility model embodiment provides；
Fig. 2 shows another kind of structural representation interfering velocity-measuring system that this utility model embodiment provides.
Specific embodiment
Purpose, technical scheme and advantage for making this utility model embodiment are clearer, new below in conjunction with this practicality
Accompanying drawing in type embodiment, is clearly and completely described it is clear that being retouched to the technical scheme in this utility model embodiment
The embodiment stated is a part of embodiment of this utility model, rather than whole embodiments.Generally described in accompanying drawing herein and
The assembly of this utility model embodiment illustrating can be arranged with various different configurations and design.
Therefore, below requirement is not intended to limit to the detailed description of the embodiment of the present utility model providing in the accompanying drawings
The scope of the present utility model of protection, but it is merely representative of selected embodiment of the present utility model.Based in this utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of not making creative work, all
Belong to the scope of this utility model protection.
It should also be noted that similar label and letter expression similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then do not need it to be defined further and explains in subsequent accompanying drawing.
The detection device of existing laser interference speed measuring equipment mostly using photodetector and oscillograph to for obtaining
The interference signal of velocity information is recorded, and due to being limited by existing photodetector and oscillographic bandwidth, the time divides
The ability of distinguishing is difficult to improve, and the tachometric survey upper limit is relatively low.
Existing photon Doppler anemometer (pdv) generally includes optical fiber laser, optical fiber circulator, fibre-optical probe, spy
Survey device and digital oscilloscope.Wherein, optical fiber laser is continuous narrow cable and wide optical fiber laser.When detector and oscillograph band are a width of
During 12.5ghz, its time sampling interval is 20ps, and now, this photon Doppler anemometer tachometric survey upper limit is about 23km/s.
Therefore, the time resolution of existing photon Doppler anemometer limited by existing detector and digital oscilloscope bandwidth it is impossible to
It is applied to higher speed diagnostic requirements.
In consideration of it, this utility model embodiment provides a kind of interference velocity-measuring system, to improve time resolution and speed
The degree measurement upper limit.
As shown in figure 1, the interference velocity-measuring system 100 that this utility model embodiment provides includes: chirped pulse generator
110th, optical fiber circulator 120, fibre-optical probe 130, the first fibre-optical dispersion element 140, detection device 150 and data processing equipment
160.
Chirped pulse generator 110 is used for producing the chirped pulse of predetermined pulse width.As a kind of embodiment, such as
Shown in Fig. 2, chirped pulse generator 110 includes femto-second laser 111 and pulse stretcher 112.Wherein, femto-second laser
111 enter horizontal pulse exhibition as LASER Light Source, the femto-second laser pulse that pulse stretcher 112 is used for femto-second laser 111 is sent
Width obtains chirped pulse.Specifically, the pulse width of chirped pulse was adjusted according to the persistent period of physical process to be measured.
For example, described physical process can be the motor process of film flying under Laser Driven or Magnetic driving.Certainly, chirped pulse generator
110 can also be other structures, for example, it is possible to the pulse laser with other with certain spectrum width replaces femtosecond laser
Device.
In a kind of embodiment of this utility model embodiment, pulse stretcher 112 can be grating pair.Now, Zhou
Sing pulse pulse width be subject to grating pair distance limit, be typically only capable to accomplish ps magnitude.Additionally, when different time to be adapted to
During the physical process measurement demand of yardstick, need to adjust the distance of grating pair in free space, adjustment process is cumbersome and takes
When.
Laser pulse due to different wave length is propagated in dispersive medium at different rates, therefore, by dispersive medium
The time explanation of laser pulse can be realized.Fibre-optical dispersion element as can be using the dispersion of element presence itself to laser arteries and veins
Rush in the fiber optic component of horizontal pulse broadening.For example, fibre-optical dispersion element can be long-range single mode fiber, chirped fiber Prague
Grating, dispersion compensating fiber etc..Specifically, the time width of obtained chirped pulse and the spectrum width of femtosecond pulse and
The length of fibre-optical dispersion element is relevant.When spectrum width one timing of the laser pulse that femto-second laser 111 sends, if optical fiber color
When scattered element is single-mode fiber or dispersion compensating fiber, the length by increase single-mode optical fiber length or dispersion compensating fiber is permissible
Increase the broadening amount of pulse；If fibre-optical dispersion element is chirped fiber Bragg grating, select the Bragg grating of low chirp rate
And accordingly increase its length and can increase the broadening amount of pulse, thus obtaining the chirped pulse of required pulse width.Need explanation
, the pulse width of chirped pulse is the record length that this tests the speed needed for process, and required record length is by concrete thing
The persistent period of reason process determines.
Therefore, in the another kind preferably embodiment of this utility model embodiment, pulse stretcher 112 adopts second
Fibre-optical dispersion element.Now, the length by increasing the optical fiber as fibre-optical dispersion element can be effectively increased the exhibition of pulse
Wide amount, the chirped pulse of record length needed for acquisition.Compared to grating to or other dispersive mediums, using the second fibre-optical dispersion
Element can reduce regulation difficulty as pulse stretcher 112, is conducive to increasing the broadening amount of pulse, to be applied to different time
The physical process measurement demand of yardstick.For example, centre wavelength be 1560nm femtosecond pulse using grating to carrying out broadening, its pulse
Width degree is directly proportional to the distance of grating pair, is typically only capable to accomplish hundreds of ps, and adopts single-mode fiber, dispersion compensating fiber
Or the fibre-optical dispersion element such as chirped fiber Bragg grating, at least can obtain the pulse width of 100ns, can be by record length
Increase 10 times -100 times.
Further, in the present embodiment, femto-second laser 111 preferably employs the femto second optical fiber laser of communication wave band c, has
Realize all -fiber light channel structure beneficial to this interference velocity-measuring system 100, consequently facilitating building and adjusting of system, it also avoid freedom
Space optical path adjusts loaded down with trivial details problem.It is of course also possible to using the femto second optical fiber laser of its all band, for example, it is also possible to adopt
With communicate l wave band femto second optical fiber laser, or communication 1260nm-1675nm in the range of any one wave band femtosecond
Optical fiber laser.
Optical fiber circulator 120 includes first port a, second port b and the 3rd port c, chirped pulse generator 110
Outfan is coupled with first port a, and fibre-optical probe 130 is coupled with second port b, the input of the first fibre-optical dispersion element 140
Couple with described 3rd port c.The outfan of the first fibre-optical dispersion element 140 is coupled with described detection device 150, detection device
150 are coupled with data processing equipment 160.In this utility model embodiment, first port a of optical fiber circulator 120, the second end
The connected relation of mouth b and the 3rd port c is: the light being entered by first port a is projected by second port b, is injected by second port b
Light projected by the 3rd port c.
In the present embodiment, optical fiber circulator 120 and fibre-optical probe 130 are used for sending chirped pulse generator 110
Chirped pulse is processed as reference light and carries the flashlight of the velocity information of target s to be measured to obtain for target s speed to be measured
The frequency domain interference signal of measurement.For example, target s to be measured can be the film flying of motion under Laser Driven or Magnetic driving.Certainly, except
Outside using optical fiber circulator 120 and fibre-optical probe 130, it would however also be possible to employ other structures, for example, Optical Fiber Michelson Interferometer or
Person's fiber Mach -Zehnder interferometer.For the structure of simplified system, the present embodiment preferably employs optical fiber circulator 120 and optical fiber is visited
130.
In the present embodiment, the first fibre-optical dispersion element 140 is used for interfering letter to the frequency domain carrying target s velocity information to be measured
Number carry out time explanation, thus reducing the frequency of frequency domain interference signal.Reduce the bandwidth requirement to detection device 150, that is, with
The detection device 150 of lower bandwidth is just able to record that the interference signal of upper frequency, and then realizes the superelevation of moving object speed
Time discrimination measurement.The concrete structure of the first fibre-optical dispersion element 140 is referred to the above of the present embodiment, and here is no longer
Repeat.
For example, the frequency representation of interference signal is f (t)=v (t)/(λ (t)/2), and wherein, v (t) is the fortune of target s to be measured
Dynamic speed, λ (t) is chirped pulse wavelength, and it changes over.When being carried out using photon Doppler anemometer as shown in Figure 1
It is assumed that the output wavelength of optical fiber laser is 1550nm during tachometric survey, when the movement velocity of target s to be measured is 1km/s, right
The interference signal frequency answered is 1.29ghz, when the movement velocity of target s to be measured is 10km/s, corresponding interference signal frequency
For 12.9ghz.
When the interference velocity-measuring system 100 being provided using this utility model embodiment, the Zhou being t1 with predetermined pulse width
Pulse of singing irradiates target s to be measured as LASER Light Source, and when the movement velocity of target s to be measured is 1km/s, the interference being formed is believed
Number frequency still is about 1.29ghz.But the pulse of the chirped pulse after the time-stretching of the second fibre-optical dispersion element
Width is t2, draw ratio m=t2/t1, and correspondingly, the interference signal frequency being formed will reduce m times.Therefore, using relatively low
The detection device 150 of bandwidth can achieve the measurement of fair speed, is effectively improved the time resolution of the system.
In the present embodiment, detection device 150 is used for received frequency domain interference signal is converted to the signal of telecommunication and is sent
To described data processing equipment 160.Because reference light and flashlight are the chirped pulse with certain spectrum width, its interference
Signal shows as sinusoidal interference striped on frequency domain.The existing frequency domain based on chirped pulse is interfered in velocity-measuring system, sinusoidal dry
Relate to striped and mostly pass through spectrogrph record, due to being limited by grating constant, raster size and imaging len focal length, existing
Spectrogrph spectrally resolved relatively low, sampling number is less, leads to the time resolution of this system to be difficult to improve.
Therefore, as shown in Fig. 2 in the present embodiment detection device 150 specifically include photodetector 151 and oscillograph 152,
The interference signal that the elapsed time that photodetector 151 is used for exporting the first fibre-optical dispersion element 140 stretches is converted to telecommunications
Number, and it is transferred to oscillograph 152, oscillograph 152 is used for carrying out data acquisition to the signal of telecommunication receiving, and by the number being gathered
It is analyzed to data processing equipment 160 according to transmitting, process this data in order to data processing equipment 160 and obtain target s to be measured
Speed.First fibre-optical dispersion element 140, photodetector 151 and oscillograph 152 are used in combination to effectively improve and originally do
Relate to the time resolution of velocity-measuring system 100.It should be noted that data processing equipment 160 can be computer or one kind
There is the IC chip of signal handling capacity.
In addition, for the signal to noise ratio improving the interference signal accessed by detection device 150, as shown in Fig. 2 the present embodiment
The interference velocity-measuring system 100 providing also includes the first optical signal amplifier 170.First optical signal amplifier 170 is arranged on first
Between fibre-optical dispersion element 140 and detection device 150, that is, be arranged on the first fibre-optical dispersion element 140 and photodetector 151 it
Between.The interference signal that first optical signal amplifier 170 is used for exporting the first fibre-optical dispersion element 140 is amplified, to improve
The signal to noise ratio of the interference signal that detection device 150 receives, thus improve the precision of tachometric survey.
Further, in order to ensure the intensity of reference light and flashlight, to improve the contrast of interference signal, can also root
According to needing to arrange the second optical signal amplifier 180 between the second fibre-optical dispersion element and optical fiber circulator 120, as shown in Figure 2.
Second optical signal amplifier 180 is used for the chirped pulse of the second fibre-optical dispersion element output is amplified.Femtosecond fiber laser
The pulse laser that device sends enters the second fibre-optical dispersion element, and the pulse stretching through the second fibre-optical dispersion element forms Zhou after processing
Sing pulse.The chirped pulse of the second fibre-optical dispersion element output enters the second optical signal amplifier 180, through the second optical signal amplification
After the processing and amplifying of device 180, optical fiber circulator 120 is entered by first port a.
In the present embodiment, the first optical signal amplifier 170 and the second optical signal amplifier 180 preferably employ fiber amplifier
Device, for example, rare-earth-ion-doped fiber amplifier or fiber Raman amplifier etc., be conducive to this interference velocity-measuring system 100 to realize
All -fiber light channel structure, consequently facilitating building and adjusting of system, it also avoid free space light path and adjusts loaded down with trivial details problem.Example
As, when the femto second optical fiber laser using communication wave band c is as light source, the first optical signal amplifier 170 and the second optical signal
Amplifier 180 can adopt EDFA Erbium-Doped Fiber Amplifier, fiber Raman amplifier etc., and these devices are more ripe commercialization device
Part, can greatly reduce system cost.
In order that this programme is clearer, below this utility model embodiment is provided interferes the one of velocity-measuring system 100
The work process planting specific embodiment illustrates:
The pulse laser that femto second optical fiber laser sends enters the second fibre-optical dispersion element, through the second fibre-optical dispersion element
Pulse stretching forms the chirped pulse of predetermined pulse width after processing.Wherein.Predetermined pulse width is according to specifically measured thing
The persistent period setting of reason process.
The chirped pulse of the second fibre-optical dispersion element output enters the second optical signal amplifier 180, through the second optical signal amplifying
After the processing and amplifying of big device 180, optical fiber circulator 120 is entered by first port a.Optical fiber circulator 120 is entered by first port a
Chirped pulse export from second port b of optical fiber circulator 120 and transmit to fibre-optical probe 130.Incide fibre-optical probe 130
Chirped pulse a part through fibre-optical probe 130 end face reflection formed reference light, another part is from fibre-optical probe 130 outgoing simultaneously
It is irradiated in target s to be measured, enter fibre-optical probe 130 formation after target s to be measured reflection and carry target s velocity information to be measured
Flashlight.Reference light and flashlight are entered by second port b of fibre-optical probe 130 reverse transfer to optical fiber circulator 120
Optical fiber circulator 120, and exported to the first fibre-optical dispersion element 140 by the 3rd port c.Therebetween, reference light and signal combiner
After interfere formation frequency domain interference signal.
The further pulse stretching through the first fibre-optical dispersion element 140 for the frequency domain interference signal being formed enters the after processing
One optical signal amplifier 170, is amplified into photodetector 151 through the first optical signal amplifier 170.Photodetector
The frequency domain receiving interference signal is converted to the signal of telecommunication by 151 is sent to oscillograph 152.By oscillograph 152, this signal of telecommunication is entered
Row data acquisition, and by the data is activation collecting to data processing equipment 160, data is carried out by data processing equipment 160
Reason obtains the speed of target s to be measured.
Specifically, data processing equipment 160 passes through to analyze interference signal acquisition target s to be measured that oscillograph 152 is recorded
The embodiment of speed can be: by Time-Frequency Analysis Method, such as window fourier transform method or continuous wavelet transform
Method can obtain the frequency of interference signal.Frequency due to interference signal is directly proportional to the movement velocity of target s to be measured, therefore
Frequency information according to obtained interference signal can obtain the speed of target s to be measured.In addition it is also possible to pass through Fourier
Alternative approach can obtain the phase place of interference signal, and the phase place due to interference signal is directly proportional to the displacement of target s to be measured, therefore
Phase information according to obtained interference signal can obtain the displacement of target s to be measured, according further to target s to be measured
Displacement obtain the speed of target s to be measured.
In sum, with respect to existing laser interference speed measuring equipment, the interference that this utility model embodiment provides is tested the speed
System 100 is used as light source by the chirped pulse that chirped pulse generator 110 produces, and interferes in the frequency domain carrying velocity information
Before signal enters detection device 150, time-stretching is carried out to described frequency domain interference signal by the first fibre-optical dispersion element 140
To reduce the frequency of interference signal, thus significantly reducing to the detection device 150 for recording this frequency domain interference signal
Bandwidth requirement, improves time resolution and the tachometric survey upper limit of this interference velocity-measuring system 100.For example, with 12.5ghz bandwidth
Detector and oscillograph 152 can achieve the 1ps even lower sampling interval, and the tachometric survey of more than 100km/s.Enter one
Step, in one kind preferably embodiment that utility model the present embodiment provides, this interference velocity-measuring system 100 is by inclusion femtosecond
Optical fiber laser, the first fibre-optical dispersion element 140, optical fiber circulator 120, fibre-optical probe 130, the second fibre-optical dispersion element and light
The all -fiber light channel structure of fiber amplifier, photodetector 151, oscillograph 152 and data processing equipment 160 are constituted, structure letter
Single, it is conveniently adjusted, it is to avoid free space light path adjusts loaded down with trivial details problem.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation are made a distinction with another entity or operation, and not necessarily require or imply these entities or deposit between operating
In any this actual relation or order.And, term " inclusion ", "comprising" or its any other variant are intended to
Comprising of nonexcludability, wants so that including a series of process of key elements, method, article or equipment and not only including those
Element, but also include other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element that limited by sentence "including a ..." it is not excluded that
Also there is other identical element including in the process of described key element, method, article or equipment.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model does not limit to
In this, any those familiar with the art, in the technical scope that this utility model discloses, can readily occur in change
Or replace, all should cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should described to weigh
The protection domain that profit requires is defined.
Claims (10)
1. a kind of interference velocity-measuring system is it is characterised in that include chirped pulse generator, the first fibre-optical dispersion element, detection
The input of device and data processing equipment, the outfan of described chirped pulse generator and described first fibre-optical dispersion element
Coupling, the outfan of described first fibre-optical dispersion element is coupled with described detection device, at described detection device and described data
Reason device coupling；
A chirped pulse part for the predetermined pulse width that described chirped pulse generator produces is transmitted to described first optical fiber
Dispersion element forms reference light, and another part incides target to be measured；The chirped-pulse propagation of described target reflection to be measured is to institute
State the first fibre-optical dispersion element and form flashlight, described reference light and described flashlight interfere the frequency domain interference signal of formation
Pulse stretching through described first fibre-optical dispersion element enters described detection device after processing.
2. system according to claim 1 is it is characterised in that also include optical fiber circulator and fibre-optical probe, described optical fiber
Circulator includes first port, second port and the 3rd port, the outfan of described chirped pulse generator and described first
Port couples, and described fibre-optical probe couples with described second port, the input of described first fibre-optical dispersion element and described the
Three port couplings.
3. system according to claim 2 it is characterised in that described first fibre-optical dispersion element and described detection device it
Between be additionally provided with the first optical signal amplifier, the pulse stretching of described first fibre-optical dispersion element output process after interference signal
Enter described first optical signal amplifier, after the processing and amplifying through described first optical signal amplifier, enter described detection device.
4. the system according to Claims 2 or 3 is it is characterised in that described chirped pulse generator includes femtosecond laser
Device and pulse stretcher, the pulse laser that described femto-second laser sends incides described pulse stretcher, through described pulse exhibition
The pulse stretching of wide device forms chirped pulse after processing.
5. system according to claim 4 is it is characterised in that described femto-second laser is femto second optical fiber laser.
6. system according to claim 5 is it is characterised in that described pulse stretcher is the second fibre-optical dispersion element.
7. system according to claim 6 is it is characterised in that described second fibre-optical dispersion element and described optical fiber circulator
Between be additionally provided with the second optical signal amplifier, pulse laser that described femto second optical fiber laser sends enters described second optical fiber
Dispersion element, the pulse stretching through described second fibre-optical dispersion element forms chirped pulse after processing, described chirped pulse enters
Described second optical signal amplifier, is entered described by described first port after the processing and amplifying through described second optical signal amplifier
Optical fiber circulator.
8. system according to claim 1 is it is characterised in that described first fibre-optical dispersion element is distance single-mode optics
Fine.
9. system according to claim 1 is it is characterised in that described first fibre-optical dispersion element is chirped fiber Prague
Grating.
10. system according to claim 1 is it is characterised in that described first fibre-optical dispersion element is dispersion compensating fiber.
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|---|---|---|---|
| CN201620831309.XU CN205899031U (en) | 2016-08-03 | 2016-08-03 | Interfere system of testing speed |
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| CN201620831309.XU CN205899031U (en) | 2016-08-03 | 2016-08-03 | Interfere system of testing speed |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981584A (en) * | 2018-09-06 | 2018-12-11 | 中国工程物理研究院流体物理研究所 | A kind of all -fiber dynamic absolute distance measurement device and method |
| CN113671209A (en) * | 2021-10-25 | 2021-11-19 | 中国工程物理研究院流体物理研究所 | Space resolution-based flyer velocity field measurement system and attitude dynamic characterization method |
| CN114459514A (en) * | 2021-12-20 | 2022-05-10 | 哈尔滨理工大学 | High-speed fiber grating sensing system and method for chirp frequency coding |
-
2016
- 2016-08-03 CN CN201620831309.XU patent/CN205899031U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981584A (en) * | 2018-09-06 | 2018-12-11 | 中国工程物理研究院流体物理研究所 | A kind of all -fiber dynamic absolute distance measurement device and method |
| CN108981584B (en) * | 2018-09-06 | 2023-07-18 | 中国工程物理研究院流体物理研究所 | All-fiber dynamic absolute distance measuring device and method |
| CN113671209A (en) * | 2021-10-25 | 2021-11-19 | 中国工程物理研究院流体物理研究所 | Space resolution-based flyer velocity field measurement system and attitude dynamic characterization method |
| CN114459514A (en) * | 2021-12-20 | 2022-05-10 | 哈尔滨理工大学 | High-speed fiber grating sensing system and method for chirp frequency coding |
| CN114459514B (en) * | 2021-12-20 | 2024-01-30 | 哈尔滨理工大学 | High-speed fiber bragg grating sensing system and method for chirp frequency coding |
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