CN102645316A - Large-caliber deflection type device for checking radial shear interference under center shielding condition and method for checking radial shear interference - Google Patents
Large-caliber deflection type device for checking radial shear interference under center shielding condition and method for checking radial shear interference Download PDFInfo
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- CN102645316A CN102645316A CN2012101217172A CN201210121717A CN102645316A CN 102645316 A CN102645316 A CN 102645316A CN 2012101217172 A CN2012101217172 A CN 2012101217172A CN 201210121717 A CN201210121717 A CN 201210121717A CN 102645316 A CN102645316 A CN 102645316A
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Abstract
The invention discloses a large-caliber deflection type device for checking radial shear interference under a center shielding condition and a method for checking radial shear interference. The device and the method are technically characterized in that on the basis of a traditional radial shear interference checking method, by means of increasing the shear rate of a telescope system and vertically inclining a reflector, a beam contracting light spot is shifted to a marginal area of a beam expanding light spot and separated from a shadow position shielded by a target in the beam expanding light spot to form interference, and radial shear interference of a specific spatial area is checked under the center shielding condition of the target. The device and the method have the advantages that the problem that the traditional radial shear interference checking method cannot be used for realizing wavefront sensing for the area with a target center shield, interference patterns can be processed by a simple phase unpacking method instead of a radial shear wave surface iteration reconfiguration method as an interference area is shifted to the edge of the beam expanding light spot, the processing procedure of the interference patterns is simplified to a certain degree, and processing time is shortened.
Description
Technical field
The present invention relates to heavy caliber deviation type radial shear interference pick-up unit and method thereof under a kind of central shielding situation.
Background technology
In the test of hypersonic speed flow field aerodynamics, the accurate measurement in flow field on every side is a problem demanding prompt solution to object in the wind-tunnel.Traditional comparatively ripe method has shadowing method and schlieren method; Wherein the second derivative of shadowing method stream field variation is responsive; And the first order derivative that the schlieren method stream field changes is responsive, but because their adopt is the principle of geometrical optics, it still remains to be improved on measuring accuracy.Adopting the radial shear interference method to detect to the High Speed Flow Field zone also is a kind of effective means.At first, radial shear interference has adopted the method for optical interference, will bring up to the optical wavelength magnitude through the accuracy of detection of distorted wavefront behind the flow field; Secondly, radial-shear interferometer belongs to accurate concurrent path interference system, has higher antijamming capability, has guaranteed still can access comparatively stable interference fringe under high noisy in the wind-tunnel detection, the high environment that vibrates, thereby has guaranteed the correctness of experimental result; In addition; Adopt the method for radial shear interference to be wavefront position phase distributed intelligence through flow field detection light beam through the data that finally obtain after the data processing in later stage; Can carry out the reconstruct of space refractive index field or density field on this basis, this be adopt luminous intensity distribution measurement shadowing method and schlieren method can not possess.
Detect for High Speed Flow Field; Detection to flow field around the wind-tunnel focus target thing is comparatively common situation; But because traditional radial shear interference method adopts contract bundle hot spot and the coaxial concentric configuration of expansion bundle hot spot; The bundle hot spot that contracts will drop on and expand in the shadow region that object throwed in the bundle hot spot, cause interference fringe to form.Therefore, just a kind of interference detection method that flow field is on every side detected that can be under object central shielding situation need to be proposed.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, heavy caliber deviation type radial shear interference pick-up unit and method thereof under a kind of central shielding situation are provided.
Heavy caliber deviation type radial shear interference pick-up unit under the central shielding situation comprises that laser instrument, collimating and beam expanding system, object, zone to be measured, spectroscope, first catoptron, high shear are than heavy caliber telescopic system, second catoptron, imaging len and detector; Wherein, Object places regional center to be measured, and laser instrument, collimating and beam expanding system, object, spectroscope, first catoptron, high shear are than heavy caliber telescopic system, second catoptron, spectroscope, imaging len and detector series arrangement in article one light path; Laser instrument, collimating and beam expanding system, object, spectroscope, second catoptron, high shear are than heavy caliber telescopic system, first catoptron, spectroscope, imaging len and detector series arrangement in the second light path; First catoptron all becomes angle
with second catoptron with vertical direction;
is
, makes the process high shear depart from former optical axis than the Shu Guang that contracts of heavy caliber telescopic system with expansion Shu Guang.
Heavy caliber deviation type radial shear interference detection method under the central shielding situation comprises the steps:
(1) it is high more coaxial than heavy caliber telescopic system, second catoptron, imaging len, detector etc. to regulate laser instrument, collimating and beam expanding system, spectroscope, first catoptron, high shear, regulates collimating and beam expanding system and makes the heavy caliber parallel light emergence;
(2) regulate spectroscopical angle and make spectroscopical transmitted light of process and reflected light be mutually 90 ° of angles, and be radiated at respectively on first catoptron and second catoptron;
(3) regulate first catoptron and second catoptron angle in the horizontal direction and the inclination angle on the vertical direction, the hot spot that makes article one light path and second light path pass through behind the imaging len overlaps on detector;
(3) between first catoptron and second catoptron, add high shear than heavy caliber telescopic system, position and the inclination angle of regulating this telescopic system make that the bundle hot spot that contracts on the detector is concentric with expansion bundle hot spot, and produce interference fringe;
(4) regulate the inclination angle of first catoptron and the second catoptron in the vertical direction, make the bundle hot spot that contracts on the detector shift out the object shaded that expands the bundle hot spot and produce and interfere;
(5) gather the interferogram that receives on the detector, the part light wave that expands Shu Boqian participation interference is approximately plane wave, interferogram is carried out phase place unpack, obtain the phase data of interferogram.
The present invention adopts will contract beam optical path and the method that expands beam optical path and optical axis deviation; Make the bundle hot spot that contracts on the detector can move on to the fringe region that expands the bundle hot spot; Solved and adopted conventional radial shear interference method can't carry out the difficult problem that wavefront detects the area of space that contains the object central shielding; Because described high shear has higher shearing ratio than heavy caliber telescopic system, can the part light wave that expand Shu Boqian participation interference be approximately plane wave and handle again, make the processing of interferogram can adopt the comparatively simply phase place unpacking method of the safe graceful Green's interference system of tradition; Promptly regard the interference of one tunnel detection light wave and one tunnel reference planes light wave as; And need not to use radial shear corrugated iterative reconstruction algorithm comparatively consuming time, and simplified the processing procedure of experimental data to a certain extent, shortened the processing time.
Description of drawings
Fig. 1 is the heavy caliber deviation type radial shear interference pick-up unit structural representation under the central shielding situation;
Fig. 2 is that the light beams that contracts of the present invention departs from optical axis through the light path synoptic diagram of high shear than heavy caliber telescopic system with the expansion light beams;
Fig. 3 is the process flow diagram of the heavy caliber deviation type radial shear interference detection method under the central shielding situation;
Fig. 4 be contract before the detector bundle hot spot with expand bundle hot spot and the wherein synoptic diagram and the interferogram of object shadow positions;
Fig. 5 is the interferogram that the detector after intercepting receives;
Fig. 6 adopts the wavefront position phase distribution plan of interfering the removal object shield portions that obtains behind the phase demodulation method of position.
Embodiment
Like Fig. 1, shown in 2, the heavy caliber deviation type radial shear interference pick-up unit under the central shielding situation comprises that laser instrument S1, collimating and beam expanding system S2, object S3, region S to be measured 4, spectroscope S5, the first catoptron S6, high shear are than heavy caliber telescopic system S7, the second catoptron S8, imaging len S9 and detector S10; Wherein, Object S3 places region S to be measured 4 centers, and laser instrument S1, collimating and beam expanding system S2, object S3, spectroscope S5, the first catoptron S6, high shear are than heavy caliber telescopic system S7, the second catoptron S8, spectroscope S5, imaging len S9 and detector S10 series arrangement in article one light path; Laser instrument S1, collimating and beam expanding system S2, object S3, spectroscope S5, the second catoptron S8, high shear are than heavy caliber telescopic system S7, the first catoptron S6, spectroscope S5, imaging len S9 and detector S10 series arrangement in the second light path; The first catoptron S6 all becomes angle
with the second catoptron S8 with vertical direction;
is
, makes the process high shear depart from former optical axis than the Shu Guang that contracts of heavy caliber telescopic system S7 with expansion Shu Guang.
Heavy caliber deviation type radial shear interference detection method under the central shielding situation comprises the steps:
(1) it is high more coaxial than heavy caliber telescopic system S7, the second catoptron S8, imaging len S9, detector S10 etc. to regulate laser instrument S1, collimating and beam expanding system S2, spectroscope S5, the first catoptron S6, high shear, regulates collimating and beam expanding system S2 and makes the heavy caliber parallel light emergence;
(2) angle of adjusting spectroscope S5 makes transmitted light and the reflected light of process spectroscope S5 be mutually 90 ° of angles, and is radiated at respectively on the first catoptron S6 and the second catoptron S8;
(3) regulate the first catoptron S6 and second catoptron S8 angle in the horizontal direction and the inclination angle on the vertical direction, the hot spot that makes article one light path and second light path pass through behind the imaging len S9 overlaps on detector S10;
(3) between the first catoptron S6 and the second catoptron S8, add high shear than heavy caliber telescopic system S7, position and the inclination angle of regulating this telescopic system make that the bundle hot spot that contracts on the detector S10 is concentric with expansion bundle hot spot, and produce interference fringe;
(4) regulate the inclination angle of the first catoptron S6 and the second catoptron S8 in the vertical direction, make the bundle hot spot that contracts on the detector S10 shift out the object shaded that expands the bundle hot spot and produce and interfere;
(5) gather the interferogram that receives on the detector S10, the part light wave that expands Shu Boqian participation interference is approximately plane wave, interferogram is carried out phase place unpack, obtain the phase data of interferogram.
As shown in Figure 2, represented to depart from former optical axis through the light path of high shear with the expansion light beams than heavy caliber telescopic system S7 through the light beams that contracts of catoptron S6 and catoptron S8 reflection.Add high shear than heavy caliber telescopic system S7 and make on the detector S10 contract the bundle hot spot with expand restraint that hot spot is concentric and produce interference fringe after, the angle of catoptron S6 and catoptron S8 and vertical direction is 0.Fine setting catoptron S6 makes itself and vertical direction that the angle of
arranged; Make on the bundle hot spot that contracts and move, this moment, interference fringe disappeared.Can find that the feedback light on the laser instrument S1 end face has also shifted out the laser emitting window simultaneously.Fine setting catoptron S8 makes near the feedback light return laser light device outgoing window, and interference fringe occurs once more, and the bundle hot spot that contracts of this moment is no longer concentric with expansion bundle hot spot, but moves a little to some extent.Continue fine setting catoptron S6 and make itself and angle
increase of vertical direction; On continuing, moves the bundle hot spot that contracts; Finely tune the feasible feedback of catoptron S8 light return laser light device outgoing window again; Interference fringe appears; So repeatable operation moves to the fringe region that expands the bundle hot spot until the bundle hot spot that contracts, and the interference fringe that obtains is the heavy caliber deviation type radial shear interference diagram data under the central shielding situation.
Because described high shear is adopted higher shearing ratio than heavy caliber telescopic system S7; And last interference fringe is positioned at the fringe region that expands Shu Boqian; Can the part light wave that expand Shu Boqian participation interference be approximately plane wave handles; Make the processing of interferogram can adopt the comparatively simply phase place unpacking method of the safe graceful Green's interference system of tradition, promptly regard one the tunnel as and detect the interference of light wave and one tunnel reference planes light wave, and need not to use radial shear corrugated iterative reconstruction algorithm comparatively consuming time; Simplify the processing procedure of experimental data to a certain extent, shortened the processing time.
Embodiment
It is one following based on the heavy caliber deviation type radial shear interference detection method case description under the central shielding situation that the present invention is applied to.
Fig. 1 is the light path layout of the heavy caliber deviation type radial shear interference detection system under the central shielding situation.The tested area size of embodiment is f70mm, and there is the object of a blunted cone shape its center.The laser instrument that adopts is the He-Ne LASER Light Source; Laser instrument S1 produces bigbore directional light through collimating and beam expanding system S2; Through object S3 centering position Detection region S 4; One tunnel toward mirror S6 after spectroscope S5 beam splitting, the process high shear is contracted than heavy caliber telescopic system S7 and is restrainted back toward mirror S8, gets into imaging len S9 through spectroscope S5 transmission; Another road light toward mirror S8; Expand bundle back toward mirror S6 through high shear than heavy caliber telescopic system S7; Get into imaging len S9 through spectroscope S5 reflection, the two-beam that gets into imaging len S9 through spectroscope S5 transmission or reflection obtains interference fringe on detector S10.Wherein, Catoptron S6 all becomes angle
with catoptron S8 with vertical direction;
is
, makes that the process high shear is restrainted than contracting of heavy caliber telescopic system S7 and expansion Shu Guang departs from former optical axis.
Table one for the effective measurement bore among the embodiment, shear and index parameter such as compare
| Effectively measure bore | Telescopic system is sheared ratio | The CCD pixel count |
| 70mm | 16:1 | 1024 × 1024 |
In the described deviation type radial shear interference system, the quality of standard source of parallel light has material impact for follow-up measurement accuracy of detection.Among the embodiment, utilize a biconcave lens to separate object lens with a pair of and form collimating and beam expanding system S2, can obtain the parallel beam of about Φ 70mm at last.Can adjust biconcave lens through a precision five dimension adjusting mechanisms and separate the coaxial of object lens with two.
High shear among the embodiment is adopted the heavy caliber Galileo to expand than heavy caliber telescopic system S7 and is restrainted the beam system that contracts.Wherein, Effective clear aperture
of big end mirror group; Effective clear aperture of small end mirror group
expands and restraints the beam ratio
that contracts.The theoretical wavefront distortion of whole mirror group is less than
; This can alleviate the influence of edge diffraction effect effectively, improve the quality that obtains interferogram.
Regulating light path among the embodiment makes each several part optical system etc. high coaxial; And make the two-beam of process spectroscope S5 be mutually 90 ° of angles; The hot spot of the two-beam of accommodation reflex mirror S6 and catoptron S8 inclination angle in the horizontal direction feasible process imaging len S9 overlaps on detector S10; Add high shear regulate after than heavy caliber telescopic system S7 its position and inclination angle make on the detector S10 contract the bundle hot spot with expand that to restraint hot spot concentric, and generation interference fringe.On this basis, the inclination angle of accommodation reflex mirror S6 and catoptron S8 in the vertical direction progressively makes the bundle hot spot that contracts on the detector S10 shift out to expand bundle hot spot object shaded and produce and interferes.Fig. 4 be contract before the detector S10 bundle hot spot with expand bundle hot spot and the wherein position view and the interferogram of object shade.The bundle hot spot that contracts that can find this moment has shifted out the shadow region of expanding object in the bundle hot spot, has also formed interference fringe simultaneously.Fig. 5 is the interference fringe that the detector S10 after intercepting receives.Utilize this interference fringe can measuring to zone to be detected around the object.
For the position phase demodulation of interference fringe, traditional phase shift technology has very big advantage on precision and squelch, but owing to need to gather multi-frame interferometry figure, does not meet the requirement that transient state detects; And Fourier transformation method is having the use of being not easy under the situation of blocking.In view of multiple position phase demodulation techniques can't be applied to the interference fringe position phase demodulation under the central shielding situation, adopted two-dimentional regularization striped position phase demodulation techniques that the interferogram that obtains is handled among the embodiment.Fig. 6 adopts the wavefront position phase distribution plan of interfering the removal object shield portions that obtains behind the phase demodulation method of position.
Claims (2)
1. the heavy caliber deviation type radial shear interference pick-up unit under the central shielding situation is characterized in that comprising that laser instrument (S1), collimating and beam expanding system (S2), object (S3), zone to be measured (S4), spectroscope (S5), first catoptron (S6), high shear are than heavy caliber telescopic system (S7), second catoptron (S8), imaging len (S9) and detector (S10); Wherein, Object (S3) places center, zone to be measured (S4), and laser instrument (S1), collimating and beam expanding system (S2), object (S3), spectroscope (S5), first catoptron (S6), high shear are than heavy caliber telescopic system (S7), second catoptron (S8), spectroscope (S5), imaging len (S9) and detector (S10) series arrangement in article one light path; Laser instrument (S1), collimating and beam expanding system (S2), object (S3), spectroscope (S5), second catoptron (S8), high shear are than heavy caliber telescopic system (S7), first catoptron (S6), spectroscope (S5), imaging len (S9) and detector (S10) series arrangement in the second light path; First catoptron (S6) all becomes angle
with second catoptron (S8) with vertical direction;
is
, makes the process high shear depart from former optical axis than the Shu Guang that contracts of heavy caliber telescopic system (S7) with expansion Shu Guang.
2. the heavy caliber deviation type radial shear interference detection method under the use central shielding situation of installing according to claim 1 is characterized in that comprising the steps:
(1) it is high more coaxial than heavy caliber telescopic system (S7), second catoptron (S8), imaging len (S9), detector (S10) etc. to regulate laser instrument (S1), collimating and beam expanding system (S2), spectroscope (S5), first catoptron (S6), high shear, and adjusting collimating and beam expanding system (S2) makes the heavy caliber parallel light emergence;
(2) angle of adjusting spectroscope (S5) makes the transmitted light and the reflected light of process spectroscope (S5) be mutually 90 ° of angles, and is radiated at respectively on first catoptron (S6) and second catoptron (S8);
(3) regulate first catoptron (S6) and second catoptron (S8) angle in the horizontal direction and the inclination angle on the vertical direction, make article one light path and second light path pass through the hot spot coincidence on detector (S10) behind the imaging len (S9);
(3) between first catoptron (S6) and second catoptron (S8), add high shear than heavy caliber telescopic system (S7), position and the inclination angle of regulating this telescopic system make that the bundle hot spot that contracts on the detector (S10) is concentric with expansion bundle hot spot, and produce interference fringe;
(4) regulate the inclination angle of first catoptron (S6) and second catoptron (S8) in the vertical direction, make that the bundle hot spot that contracts on the detector (S10) shifts out the object shaded that expands the bundle hot spot and produces interference;
(5) gather the interferogram that receives on the detector (S10), the part light wave that expands Shu Boqian participation interference is approximately plane wave, interferogram is carried out phase place unpack, obtain the phase data of interferogram.
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Cited By (4)
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| CN104183177A (en) * | 2014-09-10 | 2014-12-03 | 哈尔滨工业大学 | Aero-optical effect simulator based on distorted image |
| CN112033647A (en) * | 2020-08-27 | 2020-12-04 | 中国科学院光电技术研究所 | Multi-aperture system pupil detection and correction method |
| CN112113739A (en) * | 2020-09-04 | 2020-12-22 | 中国空气动力研究与发展中心高速空气动力研究所 | Method for measuring boundary layer density field by using loop radial shearing interferometry |
| CN112964203A (en) * | 2021-02-08 | 2021-06-15 | 杭州晶耐科光电技术有限公司 | Glancing incidence common-path self-interference device for detecting rough plane surface type |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112113739A (en) * | 2020-09-04 | 2020-12-22 | 中国空气动力研究与发展中心高速空气动力研究所 | Method for measuring boundary layer density field by using loop radial shearing interferometry |
| CN112964203A (en) * | 2021-02-08 | 2021-06-15 | 杭州晶耐科光电技术有限公司 | Glancing incidence common-path self-interference device for detecting rough plane surface type |
| CN112964203B (en) * | 2021-02-08 | 2022-09-16 | 杭州晶耐科光电技术有限公司 | Glancing incidence common-path self-interference device for detecting rough plane surface type |
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