CN204128686U - A kind of all-fiber Frequency Domain Interferometer - Google Patents
A kind of all-fiber Frequency Domain Interferometer Download PDFInfo
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- CN204128686U CN204128686U CN201420658771.5U CN201420658771U CN204128686U CN 204128686 U CN204128686 U CN 204128686U CN 201420658771 U CN201420658771 U CN 201420658771U CN 204128686 U CN204128686 U CN 204128686U
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Abstract
The utility model provides a kind of all-fiber Frequency Domain Interferometer, and 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 are connected by optical patchcord, and annexation is that circulator three end connects wideband pulse laser instrument, chirped fiber grating and fibre optic isolater respectively; The fiber optic splitter four end respectively connecting fiber isolator other end, optical-fiber bundling device, fibre optic attenuator and optical fiber exports collimation camera lens; The another two ends of optical-fiber bundling device connecting fiber delayer and spectrometer respectively.All-fiber Frequency Domain Interferometer of the present utility model has the feature of non-contact type, high time resolution follow-on test, and one-piece construction is simple, volume is little, be easy to debugging, good stability.The feature of all-fiber Frequency Domain Interferometer of the present utility model shows that it can be used as the speed testing system of high time resolution.
Description
Technical field
The utility model belongs to ultra-fast optical measuring technology, is specifically related to a kind of all-fiber Frequency Domain Interferometer.
Background technology
The dynamic response of research material under strong shock wave effect is one of physical advanced subject.When shock wave is propagated in the 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 usually, namely the speed by measuring free surfaces of specimen is counter pushes away particle rapidity, conventional diagnostic device has velocity interferometer (VISAR) and the Frequency Domain Interferometer of any reflecting surface, wherein, the latter has higher time resolution relative to the former, can reach subpicosecond magnitude, is that ultrafast laser drives one of main method of testing of shock wave.
The principle of work of Frequency Domain Interferometer is, a branch of broadband laser pulse produces the two pulses with certain delay-time difference by unequal arm Michelson interferometer, wherein a branch of as direct impulse, experience testing sample, the phase place change relevant with sample occurs, and another Shu Ze uses as with reference to pulse; Two bundle laser pulses finally by conjunction Shu Shixian co-axial propagation, and successively enter spectrometer register system, form and record frequency spectrum interference striped wherein; 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, thus can obtain testing sample information, the non-contact optical realizing sample is measured.If broadband laser pulse is a kind of linear-chirped-pulse (namely pulsed frequency changes linearly over time), gained sample message will be the Historical Evolution process within the scope of certain hour, and this drives the 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, not easily debugs, and stability is not good enough.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of all-fiber Frequency Domain Interferometer.A kind of all-fiber Frequency Domain Interferometer of the present utility model, whole system is fibre system, it instead of 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 physics experiment, be used for carrying out single-shot measurement to free surfaces of specimen speed history.
A kind of all-fiber Frequency Domain Interferometer of the present utility model, 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 export collimation camera lens and spectrometer.
All fiber optic component and devices are connected by optical patchcord, and annexation is the port that wideband pulse laser instrument connects circulator, and two other port of circulator connects the input port of chirped fiber grating and fibre optic isolater respectively; The output terminal connecting fiber beam splitter of fibre optic isolater, residue three ports difference connecting fibers of fiber optic splitter export the input port of collimation camera lens, fibre optic attenuator and optical-fiber bundling device; A port of the output terminal connecting fiber delayer of fibre optic attenuator, second input port of the other end connecting fiber bundling device of fiber delay line, the output terminal of optical-fiber bundling device connects spectrometer.
The optical fiber core diameter of described optical patchcord is 10 μm.
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 operating central wavelength of described fiber optic component and device and optical patchcord is 1064 nm, and bandwidth of operation is greater than 40 nm.
Described wideband pulse laser instrument is super continuous pulse laser, and laser instrument can realize monopulse and export.
Described circulator is three end circulators, and first port connects wideband pulse laser instrument, and second port connects chirped fiber grating, the 3rd port connecting fiber isolator.
Broadband laser pulse broadening is linear-chirped-pulse by described chirped fiber grating, and the chirp value of chirped fiber grating is-10 nm/ps; Not measured signal is in the same time encoded to spectrally different by described linear-chirped-pulse, 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, thus 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 continuously adjustabe of described fibre optic attenuator, thus the relative intensity between two input beams of control optical-fiber bundling device, to obtain the good frequency spectrum interference striped of contrast.
Continuously adjustabe time delay that described fiber delay line produces, by arranging certain time delay, makes the delay-time difference between two of optical-fiber bundling device input beams equal 2 ~ 3 ps, thus 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 exports the laser alignment output that collimation camera lens makes 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 purpose of this utility model realizes like this, the wideband pulse that wideband pulse laser instrument exports is from first port input circulator of circulator, out chirped fiber grating is entered afterwards from second port of circulator, broadband laser pulse broadening is linear-chirped-pulse (namely pulsed frequency changes linearly over time) by chirped fiber grating, linear-chirped-pulse returns circulator again, then from the 3rd port of circulator out and enter fibre optic isolater; Linear-chirped-pulse, by after fibre optic isolater, enters fiber optic splitter, is divided into two parts by it, is used separately as detection light and reference light; Detection light enters optical fiber by optical fiber and exports collimation camera lens, the collimated light beam vertical illumination sample surface exported, its reflected light returns optical fiber after being collimated shots, and then enter fiber optic splitter, wherein about the light beam of half enters an input port of optical-fiber bundling device by optical fiber, when sample surfaces is moved by impacting because of sample, will there is respective change in the phase place of detection light; For the reference light that fiber optic splitter exports, it by after a fibre optic attenuator and a fiber delay line, enters another input port of optical-fiber bundling device successively; Detection light and reference light successively export with the output port of certain delay-time difference from optical-fiber bundling device, then enter spectrometer by optical fiber, the frequency spectrum interference striped produced by spectrometer record; By carrying out spectrum unscrambling to frequency spectrum interference striped, the velocity variations history that derived sample surface (is equivalent to linear-chirped-pulse pulsewidth) within the scope of certain hour.
All-fiber Frequency Domain Interferometer of the present utility model, compared with traditional frequency domain interferometer system, have structure simple, volume is little, lightweight, is easy to debugging, the advantage of good stability.
Accompanying drawing explanation
Fig. 1 is all-fiber Frequency Domain Interferometer structural representation in the utility model embodiment 1.
Embodiment
For enabling above-mentioned purpose of the present utility model, feature and advantage become apparent more, are described in detail embodiment of the present utility model below in conjunction with accompanying drawing.
Employ much concrete parameter in the following description so that fully understand the utility model, but these parameters are example, it should not limit the scope of the utility model protection at this.
embodiment 1
A kind of all-fiber Frequency Domain Interferometer of the present utility model, as shown in Figure 1, collimation camera lens and spectrometer is exported containing 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.
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 wideband pulse laser instrument 1, chirped fiber grating 3 and fibre optic isolater 4 respectively; An input port of the output terminal connecting fiber beam splitter 5 of fibre optic isolater 4, another input port of fiber optic splitter 5 is connected with first input port of optical-fiber bundling device 9, two output ports connecting fiber output collimation camera lens 6 and fibre optic attenuator 7 respectively of fiber optic splitter 5; The output port connecting fiber delayer 8 of fibre optic attenuator 7, second input port of the other end connecting fiber bundling device 9 of fiber delay line 8, 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 exports is from first port input circulator 2 of circulator 2, chirped fiber grating 3 is entered after second port of circulator 2 exports, broadband laser pulse broadening is linear-chirped-pulse (namely pulsed frequency changes linearly over time) by chirped fiber grating 3, linear-chirped-pulse returns circulator 2 from second port of circulator 2, then from the 3rd port of circulator 2 out and enter fibre optic isolater 4, fibre optic isolater 4 allows that laser is unidirectional passes through, laser is stoped to pass through in the other direction, thus 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 detection light and reference light, detection light enters optical fiber by optical fiber and exports collimation camera lens 6, the collimated light beam vertical illumination sample surface exported, its reflected light is exported after collimation camera lens 6 is collected by optical fiber and returns optical fiber, and then enter fiber optic splitter 5, wherein about the energy of half enters an input port of optical-fiber bundling device 9 by optical fiber, for the reference light that fiber optic splitter 5 exports, 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 the intensity continuously adjustabe of reference light, to ensure that the two-way light intensity entering optical-fiber bundling device 9 is suitable, and fiber delay line 8 is used for regulating the light path of reference light experience, and the mistiming making itself and detection light arrive optical-fiber bundling device 9 equals 2 ps, detection light and reference light successively export with the output port of certain delay-time difference (2 ps) from optical-fiber bundling device 9, then enter spectrometer 10 by optical fiber, are recorded the frequency spectrum interference striped of generation by spectrometer 10.
Above the structure of all-fiber Frequency Domain Interferometer of the present utility model being described in detail, in order to better understand measuring principle of the present utility model, being described in detail to the specifically process of testing the speed of the utility model all-fiber Frequency Domain Interferometer below.
Suppose to be moved by impacting, namely with certain speed because of sample in testing sample surface.Now, if optical fiber exports detection light vertical irradiation that collimation camera lens exports to testing sample is surperficial and by vertical reflection, according to Doppler's principle, the detection light phase (time not moving in relative sample surface) after reflection will change.Optical fiber exports collimation shots reflected light and is returned fiber optic splitter, then enters spectrometer via optical-fiber bundling device.In spectrometer, the reference light generation frequency domain that detection light and front and back moment arrive is interfered, by spectrometer record and output spectrum interference fringe.The static striped of record when not moving relative to sample surfaces, the frequency spectrum interference striped this moment recorded there occurs corresponding movement, can extract detection light phase change corresponding to move of stripe by data processing, recycling Doppler phase shift formula can in the hope of testing sample superficial velocity.In all-fiber Frequency Domain Interferometer of the present utility model, owing to detecting only linear-chirped-pulse, therefore, according to single width frequency spectrum interference striped, the velocity variations history of testing sample surface within the scope of certain hour can just be obtained.
So far all-fiber Frequency Domain Interferometer of this embodiment is completed.
The above is only embodiment of the present utility model, not does any pro forma restriction to the utility model.
Although the utility model discloses as above with embodiment, but and be not used to limit the utility model.Any those of ordinary skill in the art, do not departing under technical solutions of the utility model ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solutions of the utility model, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content change and modification not departing from technical solutions of the utility model, all still belongs to the scope of technical solutions of the utility model protection.
Claims (4)
1. an all-fiber Frequency Domain Interferometer, it is characterized in that, the fiber optic component and device that described interferometer contains has 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 to export collimation camera lens and spectrometer; Its annexation is, described fiber optic component and device is all connected by optical patchcord, described wideband pulse laser instrument (1) connects a port of circulator (2), and two other port of circulator (2) connects the input port of chirped fiber grating (3), fibre optic isolater (4) respectively; The output terminal connecting fiber beam splitter (5) of described fibre optic isolater (4), residue three ports connecting fiber output collimation camera lens (6), the input port of fibre optic attenuator (7) and input port of optical-fiber bundling device (9) respectively of fiber optic splitter (5); A port of the output terminal connecting fiber delayer (8) of fibre optic attenuator (7), the another port of fiber delay line (8) is connected with second input port of optical-fiber bundling device (9), and the output terminal of optical-fiber bundling device (9) connects spectrometer (10).
2. all-fiber Frequency Domain Interferometer according to claim 1, is characterized in that: described wideband pulse laser instrument is super continuous pulse laser.
3. all-fiber Frequency Domain Interferometer according to claim 1, is characterized in that: the attenuation multiple continuously adjustabe of described fibre optic attenuator.
4. all-fiber Frequency Domain Interferometer according to claim 1, is characterized in that: continuously adjustabe time delay of described fiber delay line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420658771.5U CN204128686U (en) | 2014-11-07 | 2014-11-07 | A kind of all-fiber Frequency Domain Interferometer |
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| CN201420658771.5U CN204128686U (en) | 2014-11-07 | 2014-11-07 | A kind of all-fiber Frequency Domain Interferometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344892A (en) * | 2014-11-07 | 2015-02-11 | 中国工程物理研究院激光聚变研究中心 | All-fiber frequency domain interferometer |
| CN109633196A (en) * | 2019-01-15 | 2019-04-16 | 中国工程物理研究院激光聚变研究中心 | A kind of all -fiber chirped pulse velocity interferometer |
-
2014
- 2014-11-07 CN CN201420658771.5U patent/CN204128686U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344892A (en) * | 2014-11-07 | 2015-02-11 | 中国工程物理研究院激光聚变研究中心 | All-fiber frequency domain interferometer |
| CN109633196A (en) * | 2019-01-15 | 2019-04-16 | 中国工程物理研究院激光聚变研究中心 | A kind of all -fiber chirped pulse velocity interferometer |
| CN109633196B (en) * | 2019-01-15 | 2022-02-08 | 中国工程物理研究院激光聚变研究中心 | All-fiber chirped pulse velocity interferometer |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150128 Effective date of abandoning: 20160518 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |