CN203732722U - Ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer - Google Patents
Ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer Download PDFInfo
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- CN203732722U CN203732722U CN201420000647.XU CN201420000647U CN203732722U CN 203732722 U CN203732722 U CN 203732722U CN 201420000647 U CN201420000647 U CN 201420000647U CN 203732722 U CN203732722 U CN 203732722U
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Abstract
The utility model discloses an ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer which comprises a pulse laser source, an input interference velocity measurement cavity, an output interference velocity measurement cavity, a beam splitter, a reflecting mirror, an imaging lens and CCD cameras. Pulses transmitted by the pulse laser source enter the input interference velocity measurement cavity, the pulses output by the input interference velocity measurement cavity are focused to a target surface to be tested through the imaging lens, the pulses reflected back from the target surface to be tested are collected through the imaging lens and are split to the reflecting mirror, then the pulses are reflected to the output interference velocity measurement cavity, and comb-type interference fringes output through the output interference velocity measurement cavity are recorded by the CCD cameras. Through the implementation of the ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer, ultrahigh time resolution can be achieved, space phase shifting face imaging can be achieved based on the ultrahigh time resolution, four interference fringe images can be recorded simply through the two CCD cameras, and higher velocity resolution can be achieved.
Description
Technical field
The utility model belongs to laser interference technical field of measurement and test, is specifically related to a kind of ultrahigh time resolution spatial phase shift surface imaging velocity interferometer of the time of can realizing and spatial discrimination velocity survey.
Background technology
Laser interference velocity measuring technique based on image-forming principle mainly contains line imaging velocity interferometer (VISAR) and framing surface imaging velocity interferometer at present, they are development of conventional point VISAR technology, with pectination interference fringe replacement " buphthalmos " shape ring grain, record one dimension or two-dimensional comb interference fringe process over time with scanning camera or framing camera, record image planes and target surface has object-image relation, can differentiate implementation space.Line imaging VISAR can measure the time dependent process of each spot speed on line of sample surfaces; The absolute velocity that framing surface imaging VISAR can measure multiple moment two dimension sample surfaces each points distributes or relative velocity distribution.Framing surface imaging VISAR technology (framing surface imaging velocity interferometer diagnosis Laser Driven Flyer Plates whole audience speed, Acta Optica, 2013,33(9)) adopt CW-laser illuminator, hypervelocity photoelectricity framing camera records the pectination interference fringe that two-dimensional space is differentiated, but be subject to the restriction of framing camera time shutter, velocity survey time resolution is generally 1ns～5ns, is difficult to meet the phase transformation of material in the ultrafast process of Laser Driven and various impact tests, the even Picosecond requirement of subnanosecond of slabbing.Each moment of framing surface imaging VISAR technology is only recorded a width interference fringe image in addition, needs to adopt Fourier transformation method to carry out phase analysis to entire image, and phase bit recovery precision only has 1/20 striped, and corresponding speed is differentiated corresponding to 1/20 fringe constant.And because Fourier transformation method is that entire image instead of each pixel are analyzed,, for the situation such as striped dislocation, division in hypervelocity process, be therefore helpless.
Conventionally the pulse width of ultrashort pulse is below hundred psecs, and the two arm delay-time difference that VISAR interference cavity Plays tool causes (fringe constant of 300m/s/Fr is corresponding to 857 ps) more than hundred psecs.Directly use obviously supershort pulse laser lighting target surface, diffusing of returning from target surface is VISAR interference cavity, to form interference.Need to there is new structure to realize the interference of ultrashort pulse in VISAR interference cavity.
It is " buphthalmos " shape interference signal of 90 ° that conventional point VISAR utilizes wave plate and polarization beam splitter prism to produce four tunnel phasic differences, and the light beam separating is on two pairs of orthogonal directionss.On a VISAR basis, develop a kind of line imaging VISAR, with optical fiber image transmission beam, polarizing prism is separated to Si road phase shift interference signal and import on scanning camera slit.Use for reference such structure implementation space phase shift surface imaging VISAR, need to use the CCD camera of 4 superfine core optical fibers coherent fiber bundles in heavy in section and 1 large photosensitive area and high pixel number, system complex, regulate difficulty, cost is expensive.
Utility model content
The purpose of this utility model is on prior art basis, to propose a kind of light path, realizes ultrahigh time resolution and tests the speed;
Another object of the present utility model is on the basis of realizing ultrahigh time resolution, to realize higher speed with spatial phase shift surface imaging VISAR light path to differentiate.
The technical solution adopted in the utility model is: a kind of ultrahigh time resolution spatial phase shift surface imaging velocity interferometer, and described interferometer comprises pulsed laser source, inputs and interfere the chamber of testing the speed, output to interfere test the speed chamber, beam splitter, catoptron, imaging lens and CCD camera; The pulse of described pulsed laser source transmitting enters input and interferes the chamber of testing the speed, interfere the pulse of the chamber output of testing the speed to focus on target surface to be measured by imaging len through input, the pulse of launching back from target surface to be measured is collected by imaging lens and is used beam splitter light splitting to reflex to output interference cavity to catoptron again, interferes the pectination interference fringe of the chamber output of testing the speed by CCD cameras record through output.
In technique scheme, described input interferes the chamber of testing the speed to interfere the chamber of testing the speed to comprise respectively an interference reflector, two low-angle beam splitters and an etalon with output, described input interferes the chamber of testing the speed to interfere the pulse input/output port in the chamber of testing the speed that a low-angle beam splitter is set respectively with output, one side of low-angle beam splitter arranges etalon, and opposite side arranges interference reflector.
In technique scheme, a side of described low-angle beam splitter arranges interference reflector near output end position, and a side of described low-angle beam splitter arranges etalon near input end position.
In technique scheme, described catoptron and output are interfered to test the speed the polarizer are set between chamber, between the interference reflector that the chamber of testing the speed is interfered in described output and low-angle beam splitter, wave plate is set, described CCD camera with export interference and test the speed and between chamber, be provided with wollaston prism.
In technique scheme, described CCD camera is two
In sum, owing to having adopted technique scheme, the beneficial effects of the utility model are:
The utility model adopts " two interference cavity " structure to solve ultrashort pulse temporal coherence problem, realizes ultrahigh time resolution.It has two identical interference cavity that test the speed (VISAR) the utility model, and time delay, Δ t was identical.The ultrashort pulse light that pulsed laser sends is through input interference cavity, becoming interval time is two pulsed lights of Δ t, be irradiated to successively target surface, two pulsed lights that return from target surface are again through output interference cavity, four pulsed lights of final generation, middle two pulsed lights substantially overlap on time shaft, meet temporal coherence requirement, can form interference, in two other pulsed light and other three, any one pulsed light does not meet temporal coherence requirement, is just present in interference image as background.Final by CCD cameras record interference fringe.Its time resolving power is not to be determined by the time shutter of CCD camera, but relies on the switch character of light source itself, realizes ultrahigh time resolution.Its time resolution is finally determined by the pulse width of ultrashort pulse, can accomplish below hundred psecs even several psecs.
This light path only produces a width interference fringe image.Can adopt Fourier transformation method to process and obtain phase place interference fringe, and then obtain whole audience velocity distribution.But the highest approximately 1/20 striped of its phase bit recovery precision, corresponding speed is distinguished as 1/20 fringe constant.The utility model adopts the combination of the polarizer, wave plate and polarization beam splitter prism to realize 4 width to have the interference fringe of the spatial phase shift of certain phase differential for this reason.On a VISAR basis, record 4 width interference fringe images with 4 CCD cameras, avoid the CCD camera structure of 4 optical fiber image transmission beams and large photosensitive area and high pixel number, simplification system, convenient adjusting, reduces costs.
More excellent scheme is to replace the polarization beam splitter prism in traditional design with Wollaston prism, realize p light and s light separates with certain angle in same direction, make only just can record two-way phase shift signalling with a CCD camera, two CCD cameras just can record four road phase shift signallings.Further simplification system, convenient adjusting, reduces costs.
Finally process with the interference fringe image of phase shift algorithm Dui Si road spatial phase shift, processing is that 4 intensity datas to mate corresponding pixel in 4 width interference images are as one group, with the data processing method processing of phase shift algorithm or some VISAR, can obtain the phase place of this pixel, successively each pixel in image is processed, just can be obtained entire image fringe phase.Can realize the phase bit recovery precision of 1/50 striped and the speed of corresponding 1/50 fringe constant differentiates.Because phase shift algorithm is that each pixel in image is processed separately, therefore, the situation such as, dislocation discontinuous for striped, division is immune.
Brief description of the drawings
The utility model will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the spatial phase shift surface imaging VISAR light path of traditional VISAR structure;
Fig. 2 is the utility model ultrahigh time resolution surface imaging VISAR light path;
Fig. 3 is spatial phase shift surface imaging VISAR light path of the present utility model;
Fig. 4 is ultrahigh time resolution spatial phase shift surface imaging VISAR index path;
Wherein: L is laser instrument, B is beam splitter, and M is catoptron, I is imaging lens, T is target surface to be measured, and C is CCD camera, and P is the polarizer, W is wave plate, PB is polarization beam splitter prism, and WP is wollaston prism, and M1, M2 are interference cavity catoptrons, B1, B2, B3, B4 are beam splitters, E1, E2 etalon.
Embodiment
As shown in Figure 2, ultrahigh time resolution surface imaging VISAR light path in the utility model adopts two interference chamber of testing the speed, the ultrashort pulse light that pulsed laser source L sends focuses on testing sample T surface by imaging len I after input interference cavity VISAR1, diffusing of testing sample T surface collected and used beam splitter B light splitting to reflex in output interference cavity VISAR2 on mirror M again by imaging lens I, in output interference cavity VISAR2, interfere and form comb-like fringe, then record this comb-like fringe by CCD camera C.Pulsed laser pulse width can be from picosecond magnitude to hundred picosecond magnitudes according to time resolution demand.
As shown in Figure 1, conventional art record has four width phase shift interference stripe patterns of certain phase differential.That returns from target surface diffuses, be polarized device P and work the linearly polarized light being biased in vertical direction with 45 °, this linearly polarized light is divided into two bundles by beam splitter B3, a branch of another beam splitter B4 that arrives after etalon, a branch ofly in addition be reflected mirror M2 reflection and after quarter wave plate W becomes elliptically polarized light, arrive again beam splitter B4, two-beam closes bundle at beam splitter B4 place, arrive respectively again polarization beam splitter prism PB, be divided into p light and s light by polarization beam splitter prism, and form interference fringe, finally realize the certain phase shift signalling output of four tunnel phasic differences, then adopt four CCD camera C to record the two-dimensional comb striped that interference cavity produces.
As shown in Figure 3, in the utility model, replace polarization beam splitter prism PB with wollaston prism WP, realize p light and separate in same direction with s light, the angle of departure is about 10 °, then just can record four road phase shift interference stripe patterns with 2 CCD camera C.Therefore, attenuating system greatly regulates difficulty, has reduced system cost.The phase-shift phase of four road phase shift interference stripeds is chosen as 90 ° conventionally.This phase shifting interference image adopts four-step phase-shifting algorithm or VISAR data processing method to process, and according to pixels processes.
As shown in Figure 4, on prior figures 2, Fig. 3 basis, by two light path combinations, obtain ultrahigh time resolution spatial phase shift surface imaging VISAR, the chamber of testing the speed is interfered in the ultra-short pulse laser input that pulsed laser L sends, pulse is divided into two-way pulse by low-angle beam splitter B1, one tunnel pulse is reflexed to etalon E1 by low-angle beam splitter B1, then again reflex to low-angle beam splitter B2 by etalon E1, pulse is irradiated to target surface T to be measured through beam splitter and imaging lens successively transmitted through low-angle beam splitter B2; Another road pulse is irradiated to interference reflector M1 above transmitted through low-angle beam splitter B1, reflexes to low-angle beam splitter B2 upper by interference reflector M1, then reflection is arrived target surface T to be measured through beam splitter B and imaging lens I successively through low-angle beam splitter B2; Target surface T to be measured so just has the pulse with the mistiming that two-way wavelength is identical.Rise and to the rearly enter output and interfere the chamber of testing the speed by polarizer P through imaging lens I, 450 beam splitters and mirror M by the pulse after target surface T to be measured reflection, pulse is divided into two-way pulse by low-angle beam splitter B3, wherein a road pulse is irradiated on etalon E2 transmitted through low-angle beam splitter B3, reflex on low-angle beam splitter B4 through etalon E2, be divided into two-way pulse by low-angle beam splitter B4 reflection and transmission, two-way pulse is passed through Wollaston prism WP by CCD cameras record; Another road pulse that low-angle beam splitter B3 separates reflexes on interference reflector M2 by low-angle beam splitter B3, seeing through wave plate W through interference reflector M2 reflection is again irradiated on low-angle beam splitter B4, be divided into two-way pulse by low-angle beam splitter B4 reflection and transmission, two-way pulse by Wollaston prism by CCD cameras record.
Disclosed all features in this instructions, except mutually exclusive feature, all can combine by any way.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (5)
1. a ultrahigh time resolution spatial phase shift surface imaging velocity interferometer, is characterized by described interferometer and comprises pulsed laser source, inputs and interfere the chamber of testing the speed, output to interfere test the speed chamber, beam splitter, catoptron, imaging lens and CCD camera; The pulse of described pulsed laser source transmitting enters input and interferes the chamber of testing the speed, interfere the pulse of the chamber output of testing the speed to focus on target surface to be measured by imaging len through input, the pulse of launching back from target surface to be measured is collected by imaging lens and is used beam splitter light splitting to reflex to output interference cavity to catoptron again, interferes the pectination interference fringe of the chamber output of testing the speed by CCD cameras record through output.
2. a kind of ultrahigh time resolution spatial phase shift surface imaging velocity interferometer according to claim 1, it is characterized by described input interferes the chamber of testing the speed to interfere the chamber of testing the speed to comprise respectively an interference reflector, two low-angle beam splitters and an etalon with output, described input interferes the chamber of testing the speed to interfere pulse input, the delivery outlet in the chamber of testing the speed that a low-angle beam splitter is set respectively with output, one side of low-angle beam splitter arranges etalon, and opposite side arranges interference reflector.
3. a kind of ultrahigh time resolution spatial phase shift surface imaging velocity interferometer according to claim 2, a side that it is characterized by described low-angle beam splitter arranges interference reflector near output end position, and a side of described low-angle beam splitter arranges etalon near input end position.
4. a kind of ultrahigh time resolution spatial phase shift surface imaging velocity interferometer according to claim 1, it is characterized by described catoptron and output interferes to test the speed the polarizer is set between chamber, between the interference reflector that the chamber of testing the speed is interfered in described output and low-angle beam splitter, wave plate is set, described CCD camera with export interference and test the speed and between chamber, be provided with wollaston prism.
5. a kind of ultrahigh time resolution spatial phase shift surface imaging velocity interferometer according to claim 1, it is characterized by described CCD camera is two.
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| CN201420000647.XU CN203732722U (en) | 2014-01-02 | 2014-01-02 | Ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760568A (en) * | 2014-01-02 | 2014-04-30 | 中国工程物理研究院流体物理研究所 | Ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer |
| CN106940222A (en) * | 2017-04-07 | 2017-07-11 | 中国工程物理研究院激光聚变研究中心 | Four sensitivity laser fusion shock velocity stellar interferometers |
-
2014
- 2014-01-02 CN CN201420000647.XU patent/CN203732722U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760568A (en) * | 2014-01-02 | 2014-04-30 | 中国工程物理研究院流体物理研究所 | Ultrahigh time resolution space phase shifting face imaging any-reflecting-surface velocity interferometer |
| CN106940222A (en) * | 2017-04-07 | 2017-07-11 | 中国工程物理研究院激光聚变研究中心 | Four sensitivity laser fusion shock velocity stellar interferometers |
| CN106940222B (en) * | 2017-04-07 | 2023-04-14 | 中国工程物理研究院激光聚变研究中心 | Four-sensitivity laser fusion shock wave velocity measurement interferometer |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140723 Effective date of abandoning: 20160413 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |