WO2009092975A2 - Instrument et procede de caracterisation d'un systeme optique - Google Patents
Instrument et procede de caracterisation d'un systeme optique Download PDFInfo
- Publication number
- WO2009092975A2 WO2009092975A2 PCT/FR2009/050064 FR2009050064W WO2009092975A2 WO 2009092975 A2 WO2009092975 A2 WO 2009092975A2 FR 2009050064 W FR2009050064 W FR 2009050064W WO 2009092975 A2 WO2009092975 A2 WO 2009092975A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical system
- instrument
- analysis
- measurement
- field
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
- G01M11/0257—Testing optical properties by measuring geometrical properties or aberrations by analyzing the image formed by the object to be tested
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0285—Testing optical properties by measuring material or chromatic transmission properties
Definitions
- the present invention relates to an instrument for characterizing an optical system. It also relates to a characterization method implemented in this instrument.
- Phase measurement systems include: - several phase measurement technologies: Fizeau interferometer, Hartmann or Hartmann Shack technology, lateral shift interferometer;
- phase measurement systems allow a characterization of the aberrations of a system. From this measurement, it is generally possible to determine, in addition to the aberrations, the optical pulse response (PSF) and the modulation transfer function (FTM) of the system to be characterized. With certain particular implementations, it is also possible to trace back to the information of the optical print and the numerical aperture of the system to be characterized.
- PSF optical pulse response
- FTM modulation transfer function
- these systems generally do not give the measurement of the focal length of the system to be characterized nor the value of the chromatic aberration and are all limited, because of their implementation, in numerical aperture.
- these systems only measure one field at a time and do not allow measurement of field curvature or lens distortion.
- the object of the present invention is to overcome the disadvantages and limitations of the above-mentioned characterization instruments, by proposing an optical metrology system based on a wavefront measurement allowing the characterization of optical components of positive power (convergent) without limitation of numerical aperture.
- wavefront analysis means arranged to receive a beam coming from the optical system
- this instrument further comprises diffusion means disposed substantially in a focusing plane of the optical system, so as to create a secondary source generating a secondary beam passing through the optical system and then directed to the analysis means of the optical system. wavefront.
- the beam from this secondary source passes through the system to be characterized and the wavefront is analyzed at the output of the optical system.
- the diffuser is mounted on a translation that allows to position it approximately at the point of focus of the beam by the optical system to be characterized in the "go" path.
- the translation axis is perpendicular to the diffuser which is parallel to the pupil of the optical system to be characterized and is in fact at the position that would have the matrix sensor (CCD or CMOS) associated with the optical system to be characterized.
- CCD or CMOS matrix sensor
- the position of the diffuser relative to the system to be characterized gives the optical drawing information of the system to be characterized.
- the displacement of a known value of this diffuser on either side of the focusing point, associated with the measurement of the evolution of the radius of curvature of the wavefront by the wavefront analyzer allows to determine the focal length of the system to be characterized.
- the measurement plane of the wavefront analyzer is conjugated with the pupil of the system to be characterized. This is necessary for wavefront metrology.
- the diffuser and the light beam focusing on it so as to eliminate the "speckle effect" especially if the light sources are monochromatic. It can be done, for example, by mounting the diffuser on a rotation whose axis of rotation is perpendicular to the latter. There are other methods to achieve this function: make the diffuser vibrate in its plane or move the light beam on the diffuser with a prism mounted on a rotation, this system being preferably placed on a portion of the optical path common to the illumination and analysis beams.
- This architecture An important interest of this architecture is its ability to make the aberration measurement in the field of the objective to be characterized. Indeed by mounting the diffuser assembly (on its translation Z) and the system to be characterized on a rotation (ROT Y), one can have a wavefront measurement in the field of the objective to be characterized. Unlike existing systems, this architecture also allows the measurement of the field curvature of the objective to be characterized.
- the plane of focus which was located in the plane diffuser in the center of the field (figure 1), is found off the plane of the diffuser when the objective works in the field ( Figure 2). Since the diffuser is no longer in the focus plane of the objective for the angle of view chosen for the measurement, the wavefront resulting from the objective to be characterized is no longer collimated and the analyzer measures the value of the defocusing which makes it possible to determine the field curvature of the objective.
- the evolution of the curvature of the wavefront resulting from the system to be characterized is measured by moving the diffuser longitudinally.
- the measurement of the focal length in the field and its evolution relative to the focal length at the center of the field gives the value of the distortion of the objective to be characterized.
- the analyzer since the analyzer is conjugated with the pupil of the objective to be characterized, it measures the shape of the pupil for any point of the measured field, which makes it possible to directly determine the possible vignetting of the objective by comparison. the size and shape of the pupil measured as a function of the angle of view.
- the analyzer by taking light sources whose luminous power is stable over time (at least during the time of a measurement cycle: a few tens of seconds maximum), the measurement of the incident flux on the The analyzer as a function of the measured field makes it possible to determine a photometric property of the objective to be characterized, namely the variation of the illumination as a function of the angle of view ("relative illumination").
- the sample can be placed in a mount mounted on a rotation whose axis is perpendicular to the pupil of the objective to characterize and pass through the center of said pupil.
- a processing of measurement signals originating from the wavefront analysis in order to deliver information of characterization of the optical system, characterized in that the lighting beam passing through the optical system is focused on a diffusion element so as to create a secondary source generating a secondary beam of analysis passing through the optical system and then directed to the wavefront analysis means.
- a difficulty generated by this measurement architecture is the management of stray light and in particular the parasitic reflections related to the optical elements common to the lighting beam (FE) and the beam analysis (FA).
- the polarization of the illumination beam is polarized on one axis and the polarization of the analysis beam is polarized on the axis rotated by 90 ° with respect to the polarization of the illumination beam (presence of polarizers on the illumination beams and analysis).
- the depolarization of the lighting beam is provided by the diffuser. If the presenter does not sufficiently depolarize the beam it is possible to a blade 1 A wave on the common path lighting-analysis for rotating the polarization by 90 °.
- FIG. 1 is a block diagram of a control instrument; characterization according to the invention, represented with a pivot angle of the zero diffusion structure; - Figure 2 corresponds to the block diagram of Figure 1, with a non-zero determined pivot angle;
- FIG. 5 represents a first graphical interface generated by implementing the characterization method according to the invention, visualizing quantitative information on the wavefront surfaces of an optical objective to be characterized;
- FIG. 6 represents a second graphical interface generated by implementing the characterization method according to the invention, displaying quantitative information on the modulation transfer function of an objective to be characterized;
- FIG. 7 shows a block diagram of a characterization instrument according to the invention, comprising a rotary prism.
- a characterization instrument 1 comprises, with reference to FIGS.
- a beam splitter module 5 intended to receive on a mount 21 an optical system to be characterized, a beam splitter module 5, a wavefront analysis module 4 and a processor module 10 designed to be connected to a terminal 11.
- the lighting source system 3 includes a first source 31 at a first wavelength, a second source 32 at a second wavelength and a dichroic mirror 33. These two sources are made for example in the form of diodes laser.
- the illumination beam produced FE is focused by a lens 34 deflected by a mirror 6 through a lens 52 and the separator module 5 to arrive at an optical system to be characterized L disposed in the frame 21 within the carrier structure 2.
- This receiving frame 21 of the optical system L can be held integral with the carrier structure 2 by magnetic coupling.
- the optical system L to be characterized may be for example an optical objective intended for example to equip a camera, a camera or a mobile phone.
- the pivoting carrier structure 2 which may have an adjustable angle of view ⁇ controlled by an electromechanical device (not shown) further comprises an optical diffusion plane element 22 whose rotation on itself is controlled by a motor 23 to suppress the effect of speckle.
- the effect of Speckle is eliminated thanks to the action of a prism 200 mounted in a frame 201 rotating at an angle 202 around itself and around the wall.
- the prism 200 is preferably a right prism with a triangular base, the base being located in the plane formed by the Z and Y axes.
- the prism 200 is preferably arranged on a portion of the optical path common to the beams of the beam. FE lighting and FA analysis.
- the rotation of the prism 200 is such that the illumination beam FE and the analysis beam FA pass through the prism 200 in all their section, regardless of the angle of rotation of said prism 200.
- the rotation of the prism 200 is preferably , but not necessarily, a regular rotation.
- the prism 200 when stationary, affects the direction of the beams passing through it without modifying their plane of focus.
- the rotation of the prism 200 thus makes it possible to move the lighting beam FE on the diffuser element 22, to suppress the effect of Speckle.
- the angle of the prism is chosen sufficiently large so as to generate a significant displacement of the focusing spot on the diffuser and small enough not to cause significant variations in the aberrations of the objective to be characterized on the amplitude of the tilts generated.
- the diffuser element 22 can also be accurately positioned along a translation axis Z perpendicular to the plane (X, Y) of the frame 21, from a motorized platform 28, within the pivoting support structure 2.
- the separator module 5 is arranged the path of the illumination beam FE and the analysis beam FA between the deflector mirror 6 and the optical system L to characterize. It comprises a separating surface 51.
- a lens 53 focuses the analysis beam FA on a spatial filtering hole 7 downstream of which a lens 70 is placed.
- the lenses 51 and 70 have a dual role: the conjugation of the pupil of the system to characterize with the measuring pupil of the analyzer and the realization of the optical magnification between the pupil of the system to be characterized and the pupil of the analyzer.
- the pupil magnification and pupil conjugation system is an afocal system without optical power.
- the analysis beam FA coming from the optical system 70 is deflected by a mirror 8 onto the input of the wavefront analysis module 4.
- This analysis module 4 includes, for example, a matrix of CCD sensors. charge coupling) and delivers analysis signals to a processor module 10 programmed to output to a terminal 11 information on the optical quality of the system to be characterized.
- the characterization instrument 1 may be designed within a compact package 100 that can be placed on a table or a workstation.
- This housing 100 may be provided on its front face with an opening 101 allowing an operator to easily access, on the pivoting structure 2, to a receiving base of the frame 21 on which is disposed the optical system L to be characterized.
- the operator can also have by the opening of a support 27 that can receive another mount before its installation on the pivoting structure 2.
- the characterization instrument 1 is connected to a computer workstation (not shown) on which an application software implementing the corresponding characterization method has been installed.
- This software provides graphical interfaces II, 12 providing the operator, on the one hand, parameterization features of the characterization instrument and, on the other hand, dashboards gathering quantitative information on the quality of the optical system. to characterize.
- the operator inserts an optical objective to be characterized in the frame 21, outside the characterization instrument 1. It then has, through the opening 101, the frame 21 on a magnetic support of the It then sends from the graphical interface II a request for a characterization.
- the processing module 10 controls the various positioning and rotation devices in the characterization instrument, to produce a series of quantitative information as a function of the angle of view and the angle of orientation of the objective. .
- the characterization method according to the invention allows a complete characterization of a positive power optical system:
- SF wavefront surface information in the form of IS surface graphs for a series of measurement angles, including distortion and vignetting values, as well as a CZ suite of Zernike coefficients ( Figure 5);
- MTF Modulation transfer function
- the number of distinct wavelength light sources used to produce the illumination beam is not limited to two and can be determined according to the characterization needs.
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Geometry (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112009000132.7T DE112009000132B4 (de) | 2008-01-18 | 2009-01-16 | Instrument und Verfahren zur Charakterisierung eines optischen Systems |
JP2010542669A JP5390534B2 (ja) | 2008-01-18 | 2009-01-16 | 光学系を特性評価するための機器及び方法 |
US12/863,058 US8593623B2 (en) | 2008-01-18 | 2009-01-16 | Instrument and method for characterising an optical system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0850336 | 2008-01-18 | ||
FR0850336A FR2926636B1 (fr) | 2008-01-18 | 2008-01-18 | Instrument et procede de caracterisation d'un systeme optique |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2009092975A2 true WO2009092975A2 (fr) | 2009-07-30 |
WO2009092975A3 WO2009092975A3 (fr) | 2009-09-17 |
Family
ID=39714172
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2009/050064 WO2009092975A2 (fr) | 2008-01-18 | 2009-01-16 | Instrument et procede de caracterisation d'un systeme optique |
Country Status (5)
Country | Link |
---|---|
US (1) | US8593623B2 (fr) |
JP (1) | JP5390534B2 (fr) |
DE (1) | DE112009000132B4 (fr) |
FR (1) | FR2926636B1 (fr) |
WO (1) | WO2009092975A2 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011119806B4 (de) * | 2011-11-25 | 2020-10-15 | Carl Zeiss Vision International Gmbh | Verfahren und Vorrichtung zum Sichtbarmachen eines Signierzeichens auf einem Brillenglas |
DE102013008645B3 (de) * | 2013-05-21 | 2014-08-21 | Alsitec S.A.R.L. | Bearbeitungskopf für eine Laserbearbeitungsvorrichtung, Laserbearbeitungsvorrichtung sowie Verfahren zum Messen von Veränderungen der Brennweite einer in einem Bearbeitungskopf enthaltenen Fokussieroptik |
FR3017963B1 (fr) * | 2014-02-27 | 2016-03-25 | Essilor Int | Instrument optique pour identifier et localiser des microgravures presentes sur une lentille ophtalmique |
FR3017964B1 (fr) | 2014-02-27 | 2016-03-25 | Essilor Int | Instrument optique pour reperer au moins un point caracteristique d'une lentille ophtalmique |
CN113916507B (zh) * | 2021-10-11 | 2024-03-08 | 北京环境特性研究所 | 小空间高集成度红外共孔径光学系统测试装置及方法 |
DE102023200924A1 (de) * | 2023-02-06 | 2024-02-22 | Carl Zeiss Smt Gmbh | Messvorrichtung zur interferometrischen Bestimmung einer Oberflächenform |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1403911A (en) * | 1972-07-26 | 1975-08-28 | Sira Institute | Method and apparatus for testing optical components |
JP3040140B2 (ja) * | 1990-07-12 | 2000-05-08 | 株式会社リコー | 色収差測定方法及び測定装置 |
US6148097A (en) * | 1995-06-07 | 2000-11-14 | Asahi Kogaku Kogyo Kabushiki Kaisha | Optical member inspecting apparatus and method of inspection thereof |
US5847822A (en) * | 1995-08-29 | 1998-12-08 | Asahi Kogaku Kogyo Kabushiki Kaisha | Optical element inspecting apparatus |
JP3613906B2 (ja) * | 1996-09-20 | 2005-01-26 | 株式会社ニコン | 波面収差測定装置 |
JP3823266B2 (ja) * | 1997-05-13 | 2006-09-20 | 株式会社トプコン | 光学特性測定装置 |
CA2311818C (fr) * | 1997-11-21 | 2002-10-01 | Autonomous Technologies Corporation | Mesure et correction objective des systemes optiques par analyse des fronts d'onde |
CN1272622C (zh) * | 1998-04-22 | 2006-08-30 | 株式会社理光 | 双折射测定方法及其装置 |
US6687396B1 (en) * | 1998-07-29 | 2004-02-03 | Pentax Corporation | Optical member inspection apparatus, image-processing apparatus, image-processing method, and computer readable medium |
TW550377B (en) * | 2000-02-23 | 2003-09-01 | Zeiss Stiftung | Apparatus for wave-front detection |
JP3730831B2 (ja) * | 2000-03-31 | 2006-01-05 | パイオニア株式会社 | 収差測定装置及び調整装置 |
US6382795B1 (en) * | 2000-05-20 | 2002-05-07 | Carl Zeiss, Inc. | Method and apparatus for measuring refractive errors of an eye |
US6827442B2 (en) * | 2001-09-12 | 2004-12-07 | Denwood F. Ross | Ophthalmic wavefront measuring devices |
US6575572B2 (en) * | 2001-09-21 | 2003-06-10 | Carl Zeiss Ophthalmic Systems, Inc. | Method and apparatus for measuring optical aberrations of an eye |
WO2003102519A1 (fr) * | 2002-05-31 | 2003-12-11 | Wavefront Sciences, Inc. | Procede et systeme de detection et d'analyse du front d'onde d'un systeme de transmission optique |
JP4343559B2 (ja) * | 2003-03-07 | 2009-10-14 | キヤノン株式会社 | 収差測定装置 |
JP4245967B2 (ja) * | 2003-04-23 | 2009-04-02 | オリンパス株式会社 | レンズ軸上軸外点像観察装置および方法 |
DE10333426B4 (de) * | 2003-07-17 | 2006-02-09 | Carl Zeiss | Verfahren und Vorrichtung zum Sichtbarmachen eines Signierzeichens auf einem Brillenglas |
JP4229782B2 (ja) * | 2003-09-05 | 2009-02-25 | オリンパス株式会社 | 波面収差測定装置 |
US20050105044A1 (en) * | 2003-11-14 | 2005-05-19 | Laurence Warden | Lensometers and wavefront sensors and methods of measuring aberration |
JP2007069283A (ja) * | 2005-09-05 | 2007-03-22 | Nikon Corp | 加工装置および加工装置を用いた製造方法 |
-
2008
- 2008-01-18 FR FR0850336A patent/FR2926636B1/fr not_active Expired - Fee Related
-
2009
- 2009-01-16 DE DE112009000132.7T patent/DE112009000132B4/de not_active Expired - Fee Related
- 2009-01-16 US US12/863,058 patent/US8593623B2/en active Active
- 2009-01-16 WO PCT/FR2009/050064 patent/WO2009092975A2/fr active Application Filing
- 2009-01-16 JP JP2010542669A patent/JP5390534B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE112009000132B4 (de) | 2019-04-11 |
FR2926636A1 (fr) | 2009-07-24 |
WO2009092975A3 (fr) | 2009-09-17 |
US20110134417A1 (en) | 2011-06-09 |
JP2011510286A (ja) | 2011-03-31 |
JP5390534B2 (ja) | 2014-01-15 |
DE112009000132T5 (de) | 2010-12-09 |
FR2926636B1 (fr) | 2010-09-17 |
US8593623B2 (en) | 2013-11-26 |
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