CN104344892B - A kind of full optical fiber Frequency Domain Interferometer - Google Patents
A kind of full optical fiber Frequency Domain Interferometer Download PDFInfo
- Publication number
- CN104344892B CN104344892B CN201410619074.3A CN201410619074A CN104344892B CN 104344892 B CN104344892 B CN 104344892B CN 201410619074 A CN201410619074 A CN 201410619074A CN 104344892 B CN104344892 B CN 104344892B
- Authority
- CN
- China
- Prior art keywords
- fiber
- optical
- fibre optic
- optical fiber
- frequency domain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Instruments For Measurement Of Length By Optical Means (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
The invention provides a kind of full optical fiber Frequency Domain Interferometer, described interferometer contains optical patchcord, wideband pulse laser instrument, circulator, chirped fiber grating, fibre optic isolater, fiber optic splitter, optical-fiber bundling device, fibre optic attenuator, fiber delay line, optical fiber output collimation camera lens and spectrometer. All optical fibre devices connect by optical patchcord, and annexation is that circulator three ends connect respectively wideband pulse laser instrument, chirped fiber grating and fibre optic isolater; Fiber optic splitter four ends connect respectively the fibre optic isolater other end, optical-fiber bundling device, fibre optic attenuator and optical fiber output collimation camera lens; The another two ends of optical-fiber bundling device connect respectively fiber delay line and spectrometer. Full optical fiber Frequency Domain Interferometer of the present invention has the feature of non-contact type, high time resolution follow-on test, and overall structure is simple, volume is little, be easy to debugging, good stability. The feature of full optical fiber Frequency Domain Interferometer of the present invention shows that it can be as the speed testing system of high time resolution.
Description
Technical field
The invention belongs to ultrafast optical testing technology, be specifically related to a kind of full optical fiber Frequency Domain Interferometer.
Background technology
The dynamic response of research material under strong shock wave effect is one of physical advanced subject. In the time that shock wave is propagated in material, after acquisition ripple, particle rapidity is very favourable for the stress-strain state of derivation material. At present, the measurement of particle rapidity adopts free surface velocity method conventionally, by measuring the anti-particle rapidity that pushes away of speed of free surfaces of specimen, conventional diagnostic device has velocity interferometer (VISAR) and the Frequency Domain Interferometer of any reflecting surface, wherein, the former has higher time resolution to the latter relatively, can reach subpicosecond magnitude, is one of main method of testing of ultrafast laser driving shock wave.
The operation principle of Frequency Domain Interferometer is, a branch of broadband laser pulse produces the two pulses with certain delay-time difference by unequal arm Michelson's interferometer, wherein a branch of as direct impulse, experience testing sample, the phase place relevant with sample occurs and change, another Shu Ze is as using with reference to pulse; Two restraint laser pulses finally by closing the coaxial transmission of Shu Shixian, and successively enter spectrometer register system, form therein and record frequency spectrum interference striped; From frequency spectrum interference striped, extract the phase place change information of the direct impulse relevant with sample, and be converted into corresponding physical quantity, thereby can obtain testing sample information, realize the non-contact optical of sample and measure. If broadband laser pulse is a kind of linear-chirped-pulse (being pulse frequency linear change in time), gained sample message will be Historical Evolution process within the scope of certain hour, and this drives experimental study of shock wave significant for ultrafast laser. Traditional frequency domain interferometer system is made up of discrete optical element, and its typical feature is that volume is large, and complex structure is difficult for debugging, and stability is not good enough.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of full optical fiber Frequency Domain Interferometer. The full optical fiber Frequency Domain Interferometer of one of the present invention, whole system is fibre system, it has replaced expensive precision optics components and parts with cheap optical fiber, cost is low, simple and compact for structure, lightweight, be easy to debugging, good stability, can be applied in the middle of shock wave Physical Experiment, is used for free surfaces of specimen speed history to carry out single-shot measurement.
The full optical fiber Frequency Domain Interferometer of one of the present invention, contains:
Optical patchcord, wideband pulse laser instrument, circulator, chirped fiber grating, fibre optic isolater, fiber optic splitter, optical-fiber bundling device, fibre optic attenuator, fiber delay line, optical fiber output collimation camera lens and spectrometer.
All fiber optic component and devices connect by optical patchcord, and annexation is the port that wideband pulse laser instrument connects circulator, and two other port of circulator connects respectively the input port of chirped fiber grating and fibre optic isolater; The output of fibre optic isolater connects fiber optic splitter, and three ports of residue of fiber optic splitter connect respectively the input port of optical fiber output collimation camera lens, fibre optic attenuator and optical-fiber bundling device; The output of fibre optic attenuator connects a port of fiber delay line, and the other end of fiber delay line connects second input port of optical-fiber bundling device, and the output of optical-fiber bundling device connects spectrometer.
The optical fiber core diameter of described optical patchcord is 10 μ m.
Described fiber optic component and device is with tail optical fiber, and described tail optical fiber is connected with optical patchcord by the mode of ring flange or welding.
The work centre wavelength of described fiber optic component and device and optical patchcord is 1064nm, and bandwidth of operation is greater than 40nm.
Described wideband pulse laser instrument is super continuous pulse laser, and laser instrument can be realized pulse output.
Described circulator is three end circulators, and first port connects wideband pulse laser instrument, and second port connects chirped fiber grating, and the 3rd port connects fibre optic isolater.
Described chirped fiber grating is linear-chirped-pulse by broadband laser pulse broadening, and the chirp value of chirped fiber grating is-10nm/ps; Described linear-chirped-pulse is encoded to measured signal in the same time not on different spectrum, then by dispersion record and the data processing of certain forms, realizes the Superfast time resolution follow-on test of measured signal in single-shot experiment.
Described fibre optic isolater makes that laser is unidirectional to be passed through, and stops laser to pass through in the other direction, thereby plays the effect of protection laser instrument.
Described fiber optic splitter is 2 × 2 fiber optic splitters, and splitting ratio is 1:1, and can oppositely use.
Described optical-fiber bundling device is 2 × 1 optical-fiber bundling devices.
The attenuation multiple of described fibre optic attenuator is adjustable continuously, thereby controls two relative intensities of inputting between light beams of optical-fiber bundling device, to obtain the good frequency spectrum interference striped of contrast.
The time delay that described fiber delay line produces is adjustable continuously, by is set certain time delay, makes two delay-time difference of inputting between light beams of optical-fiber bundling device equal 2～3ps, thereby obtains the suitable frequency spectrum interference striped of fringe spacing.
The position of described fibre optic attenuator and fiber delay line can exchange.
Described optical fiber output collimation camera lens makes the laser alignment output of optical fiber input, and spot diameter is larger.
The data of described spectrometer record are frequency spectrum interference striped, and interference fringe direction is parallel to spectrum axle.
The object of the present invention is achieved like this, the wideband pulse of wideband pulse laser instrument output is from first port input circulator of circulator, enter chirped fiber grating from second port of circulator out, chirped fiber grating is linear-chirped-pulse (being pulse frequency linear change in time) by broadband laser pulse broadening, linear-chirped-pulse returns to circulator again, then out goes forward side by side into fibre optic isolater from the 3rd port of circulator; Linear-chirped-pulse, by after fibre optic isolater, enters fiber optic splitter, is divided into two parts by it, is used separately as and surveys light and reference light; Survey light and enter optical fiber output collimation camera lens by optical fiber, the collimated light beam vertical illumination sample surface of output, its reverberation is collimated after camera lens is collected and returns to optical fiber, and then enter fiber optic splitter, wherein the light beam of about half enters an input port of optical-fiber bundling device by optical fiber, in the time that sample surfaces is moved because sample impacts, will there is respective change in the phase place of surveying light; For the reference light of fiber optic splitter output, it by after a fibre optic attenuator and a fiber delay line, enters another input port of optical-fiber bundling device successively; Survey the successively output of output port from optical-fiber bundling device with certain delay-time difference of light and reference light, then enter spectrometer by optical fiber, the frequency spectrum interference striped being produced by spectrometer record; By frequency spectrum interference striped is carried out to spectrum unscrambling, the velocity variations history that derived sample surface (is equivalent to linear-chirped-pulse pulsewidth) within the scope of certain hour.
Full optical fiber Frequency Domain Interferometer of the present invention, compared with traditional frequency domain interferometer system, has simple in structurely, and volume is little, lightweight, is easy to debugging, the advantage of good stability.
Brief description of the drawings
Fig. 1 is the full optical fiber Frequency Domain Interferometer structural representation in the embodiment of the present invention 1.
Detailed description of the invention
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Used in the following description a lot of concrete parameters so that fully understand the present invention, but these parameters are example, it should not limit the scope of protection of the invention at this.
Embodiment 1
The full optical fiber Frequency Domain Interferometer of one of the present invention, as shown in Figure 1, contain optical patchcord, wideband pulse laser instrument, circulator, chirped fiber grating, fibre optic isolater, fiber optic splitter, optical-fiber bundling device, fibre optic attenuator, fiber delay line, optical fiber output collimation camera lens and spectrometer.
All fiber optic component and devices are with tail optical fiber, and tail optical fiber is connected with optical patchcord in the mode of welding. The annexation of optical fibre device is the input port that three ports of circulator 2 connect respectively wideband pulse laser instrument 1, chirped fiber grating 3 and fibre optic isolater 4; The output of fibre optic isolater 4 connects an input port of fiber optic splitter 5, another input port of fiber optic splitter 5 is connected with first input port of optical-fiber bundling device 9, and two output ports of fiber optic splitter 5 connect respectively optical fiber output collimation camera lens 6 and fibre optic attenuator 7; The output port of fibre optic attenuator 7 connects fiber delay line 8, and the other end of fiber delay line 8 connects second input port of optical-fiber bundling device 9, and the output port of optical-fiber bundling device 9 connects spectrometer 10.
In the present embodiment, the broadband laser pulse that wideband pulse laser instrument 1 is exported is from first port input circulator 2 of circulator 2, from second port output of circulator 2, enter chirped fiber grating 3, chirped fiber grating 3 is linear-chirped-pulse (being pulse frequency linear change in time) by broadband laser pulse broadening, linear-chirped-pulse returns to circulator 2 from second port of circulator 2, then out go forward side by side into fibre optic isolater 4 from the 3rd port of circulator 2, 4 of fibre optic isolaters allow that laser is unidirectional to be passed through, stop laser to pass through in the other direction, thereby play the effect of protection laser instrument, linear-chirped-pulse, by after fibre optic isolater 4, enters fiber optic splitter 5, is divided into two parts by it, is used separately as and surveys light and reference light, survey light and enter optical fiber output collimation camera lens 6 by optical fiber, the collimated light beam vertical illumination sample surface of output, its reverberation returns to optical fiber after being collected by optical fiber output collimation camera lens 6, and then enter fiber optic splitter 5, wherein the energy of about half enters an input port of optical-fiber bundling device 9 by optical fiber, the reference light of exporting for fiber optic splitter 5, it is successively by after fibre optic attenuator 7 and fiber delay line 8, enter another input port of optical-fiber bundling device 9, wherein, fibre optic attenuator 7 makes with reference to light intensity adjustable continuously, the two-way luminous intensity that enters optical-fiber bundling device 9 with guarantee is suitable, and fiber delay line 8 is used for regulating the light path of reference light experience, makes itself and the time difference of surveying light arrival optical-fiber bundling device 9 equal 2ps, survey the successively output of output port from optical-fiber bundling device 9 with certain delay-time difference (2ps) of light and reference light, then enter spectrometer 10 by optical fiber, recorded the frequency spectrum interference striped of generation by spectrometer 10.
Above the structure of full optical fiber Frequency Domain Interferometer of the present invention is described in detail, measuring principle for a better understanding of the present invention, below will be described in detail the specifically process of testing the speed of the full optical fiber Frequency Domain Interferometer of the present invention.
Suppose that testing sample surface moved because sample impacts, with certain speed. Now, if optical fiber output collimates the detection light vertical irradiation of camera lens output to testing sample surface and by vertical reflection, according to doppler principle, the detection light phase (when sample surfaces does not move relatively) after reflection will change. Optical fiber output collimation camera lens is collected reverberation and is returned to fiber optic splitter, then enters spectrometer via optical-fiber bundling device. In spectrometer, survey the reference light generation frequency domain interference that light and front and back moment arrive, by spectrometer record and output spectrum interference fringe. The static striped of record while not moving with respect to sample surfaces, there is corresponding movement in the frequency spectrum interference striped of record this moment, can extract by data processing the detection light phase that move of stripe is corresponding and change, recycling Doppler phase shift formula can be in the hope of testing sample superficial velocity. In full optical fiber Frequency Domain Interferometer of the present invention, owing to surveying only linear-chirped-pulse, therefore, according to single width frequency spectrum interference striped, just can obtain the velocity variations history of testing sample surface within the scope of certain hour.
So far completed the full optical fiber Frequency Domain Interferometer of this embodiment.
The above, be only optional embodiment of the present invention, not the present invention done to any pro forma restriction.
Although the present invention discloses as above with optional embodiment, but not in order to limit the present invention. Any those of ordinary skill in the art, do not departing from technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible variations and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations. Therefore, every content change and modification that does not depart from technical solution of the present invention, all still belongs to the scope that technical solution of the present invention is protected.
Claims (4)
1. a full optical fiber Frequency Domain Interferometer, it is characterized in that, the fiber optic component and device that described interferometer contains has wideband pulse laser instrument, circulator, chirped fiber grating, fibre optic isolater, fiber optic splitter, optical-fiber bundling device, fibre optic attenuator, fiber delay line, optical fiber output collimation camera lens and spectrometer; Its annexation is, described fiber optic component and device all connects by optical patchcord, described wideband pulse laser instrument (1) connects a port of circulator (2), and two other port of circulator (2) connects respectively the input port of chirped fiber grating (3), fibre optic isolater (4); The output of described fibre optic isolater (4) connects fiber optic splitter (5), and three ports of residue of fiber optic splitter (5) connect respectively optical fiber output collimation camera lens (6), the input port of fibre optic attenuator (7) and the input port of optical-fiber bundling device (9); The output of fibre optic attenuator (7) connects a port of fiber delay line (8), and the another port of fiber delay line (8) is connected with second input port of optical-fiber bundling device (9), and the output of optical-fiber bundling device (9) connects spectrometer (10).
2. full optical fiber Frequency Domain Interferometer according to claim 1, is characterized in that: described wideband pulse laser instrument is super continuous pulse laser.
3. full optical fiber Frequency Domain Interferometer according to claim 1, is characterized in that: the attenuation multiple of described fibre optic attenuator is adjustable continuously.
4. full optical fiber Frequency Domain Interferometer according to claim 1, is characterized in that: the time delay of described fiber delay line is adjustable continuously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410619074.3A CN104344892B (en) | 2014-11-07 | 2014-11-07 | A kind of full optical fiber Frequency Domain Interferometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410619074.3A CN104344892B (en) | 2014-11-07 | 2014-11-07 | A kind of full optical fiber Frequency Domain Interferometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104344892A CN104344892A (en) | 2015-02-11 |
| CN104344892B true CN104344892B (en) | 2016-05-18 |
Family
ID=52500982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410619074.3A Active CN104344892B (en) | 2014-11-07 | 2014-11-07 | A kind of full optical fiber Frequency Domain Interferometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104344892B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108458782A (en) * | 2018-01-30 | 2018-08-28 | 中国计量大学 | A kind of high speed full optical fibre vibration measurement with laser system |
| CN110962887B (en) * | 2018-09-28 | 2021-09-03 | 比亚迪股份有限公司 | Train control system and method and train |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6697159B2 (en) * | 2001-07-17 | 2004-02-24 | The University Of Kansas | Optical domain signal analyzer |
| JP3875160B2 (en) * | 2002-08-23 | 2007-01-31 | 株式会社アドバンテスト | Optical characteristic measuring apparatus, method, program using quantum interference, and recording medium recording the program |
| EP1744119A1 (en) * | 2005-07-15 | 2007-01-17 | Proximion Fiber Systems AB | Swept-source optical coherence tomography |
| CN102645168A (en) * | 2012-05-16 | 2012-08-22 | 中国工程物理研究院流体物理研究所 | System for measuring nanometer micrometric displacement based on full-fiber frequency domain interference |
| CN204128686U (en) * | 2014-11-07 | 2015-01-28 | 中国工程物理研究院激光聚变研究中心 | A kind of all-fiber Frequency Domain Interferometer |
-
2014
- 2014-11-07 CN CN201410619074.3A patent/CN104344892B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104344892A (en) | 2015-02-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104764898B (en) | It is a kind of to realize two kinds of velocity measuring techniques to a measuring point while the device of repetition measurement using single probe monochromatic light road | |
| CN104199044B (en) | A kind of double mode, ultrahigh speed moving object movement velocity measurement apparatus and method | |
| CN104697647B (en) | The time waveform of ultrashort pulse and the measurement apparatus of chirp rate and measuring method | |
| CN105444700A (en) | Multi-wavelength multi-optical axis parallelism detection device and detection method | |
| CN106289544A (en) | The pulse measuring method of high-contrast and measurement apparatus | |
| CN101634571A (en) | Optical pulse raster distributed fiber sensing device | |
| CN101398294B (en) | Compact all optical fiber displacement interferometer | |
| CN103760568B (en) | A kind of ultrahigh time resolution spatial phase shift surface imaging velocity interferometer | |
| CN105675153B (en) | The radially measuring device and measurement method of group delay before heavy caliber ultrashort laser pulse | |
| CN107064100A (en) | Fiber Raman spectrometer based on dispersion time-varying | |
| CN100337088C (en) | All-fiber displacement interferometer | |
| CN105181590B (en) | A kind of interference with common path device of the detection ultrafast phenomena based on femtosecond laser | |
| CN104344892B (en) | A kind of full optical fiber Frequency Domain Interferometer | |
| CN204330141U (en) | A kind of apparatus for measuring high power ultra-short laser pulse contrast | |
| CN204128686U (en) | A kind of all-fiber Frequency Domain Interferometer | |
| CN102226683A (en) | Light wave microwave secondary frequency mixing system | |
| CN104729723A (en) | Measurement method of chirp characteristics of linear chirp pulses | |
| CN202453495U (en) | Tunable laser range simulator | |
| CN107064539A (en) | A kind of big visual field photon Doppler speed measuring device and method | |
| CN102636337A (en) | Method for measuring optical fiber dispersion | |
| US20220187126A1 (en) | Broadband pulsed light source apparatus | |
| CN103267478B (en) | High-precision position detection device and method | |
| CN108917931B (en) | Transient spectral signal measuring device | |
| CN102253390A (en) | Optical-fiber displacement interferometer | |
| CN109633196B (en) | All-fiber chirped pulse velocity interferometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |