NL1039643C2 - Optical chopper with combined tip/tilt movement. - Google Patents

Optical chopper with combined tip/tilt movement. Download PDF

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Publication number
NL1039643C2
NL1039643C2 NL1039643A NL1039643A NL1039643C2 NL 1039643 C2 NL1039643 C2 NL 1039643C2 NL 1039643 A NL1039643 A NL 1039643A NL 1039643 A NL1039643 A NL 1039643A NL 1039643 C2 NL1039643 C2 NL 1039643C2
Authority
NL
Netherlands
Prior art keywords
mirror
intermediate body
tip
tilt
displacement
Prior art date
Application number
NL1039643A
Other languages
Dutch (nl)
Inventor
Hubertus Leonardus Mathias Marie Janssen
Maurice Anton Jacques Teuwen
Sander Leonardus Paalvast
Original Assignee
Janssen Prec Engineering
Hubertus Leonardus Mathias Marie Janssen
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Janssen Prec Engineering, Hubertus Leonardus Mathias Marie Janssen filed Critical Janssen Prec Engineering
Priority to NL1039643A priority Critical patent/NL1039643C2/en
Application granted granted Critical
Publication of NL1039643C2 publication Critical patent/NL1039643C2/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
    • G02B7/1822—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors comprising means for aligning the optical axis
    • G02B7/1827—Motorised alignment
    • G02B7/1828—Motorised alignment using magnetic means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
    • G02B7/183—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors specially adapted for very large mirrors, e.g. for astronomy, or solar concentrators

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Astronomy & Astrophysics (AREA)
  • Sustainable Development (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)

Description

Optical chopper with combined tip/tilt movement
The invention concerns a device for a fast tip and tilt 5 movement of an optical mirror so called “chopper”.
In modern astronomic instruments for finding planets, the chopper is used to alternatively image a possible planet location and the nearby sky background.
Essential for such a device is the high pointing 10 accuracy and the high duty cycle, meaning a very fast movement between the two observation spots in order to maximize observation time. Mostly such devices have only a movement about one axis and two devices are needed in order to create a flexible tip and tilt 15 movement. The need to integrate two systems is a cost driver and will limit the performance due to double mirror reflections and dynamic interaction.
The invention concerns the introduction of a kinematic 20 support of the moving mirror where three degrees of freedom in the mirror plane are guided by struts while the remaining tip, tilt and Z displacement are actuated by a force while their position is being measured and used for position control.
25 The exact nature of this invention, as well as its objectives becomes clear in the accompanying drawings wherein:
Fig.1 Is a top view of the system indicating the 30 mirror to be fixed in plane by three struts while the remaining tip, tilt and Z displacement are actuated.
1039643 2
Fig.2 Is a cross section of the system indicating the mirror to be fixed in plane by three struts while the remaining tip, tilt and Z displacement are actuated.
5
In figure 1, the mirror 1 is connected via three tangential leaf springs 2 to the intermediate body 3 in such a way that tip and tilt (rotations about X and Y 10 axis) of the mirror surface are linked to the intermediate body with high stiffness while forces due to different thermal expansions between mirror and intermediate body are obsolete and deformation of the mirror will be avoided.
15 The intermediate body 3 is connected via three tangential struts 4 to the fixed world in such a way that rotations like tip and tilt and Z displacement are allowed, while displacement in X,Y and rotation Rz are fi x at e d .
20 The tip and tilt as well as the Z position of the intermediate body 3 can be affected with the three voice coil actuators 6, by application of a controllable force.
In figure 2, a cross section of the system is shown with 25 the magnet part 9 of the voice coil connected to the moving intermediate body 3 and the wired coil 10 connected to the static fixed world 5. The position of the mirror for tip, tilt and Z displacement is measured directly between the fixed world 5 and the mirror 1 by 30 means of a displacement sensor 7 and can be used for control purposes.
1039643

Claims (8)

1. De uitvinding betreft een optisch instrument met het 5 kenmerk dat: een spiegel zodanig met een t u s s e n 1 i c h a am is verbonden dat het spiegelvlak iedere tip en tilt beweging van dit tu s s e n 1 i c h aam volgt; dit tussenlichaam in zijn vlak spelingsvrij wordt 10 gefixeerd door minimaal drie tangentiale ondersteuningen terwijl er nog steeds de vrijheid bestaat om een tip, tilt en Z verplaatsing te maken; de tip, tilt en Z verplaatsing van dit tussenlichaam wordt gerealiseerd door middel van minimaal drie 15 voice coils die krachten op dit tussenlichaam uitvoeren; de tip, tilt en Z verplaatsingen met v e r p 1 a a t s i n g s s e n s o r e n direct op de spiegel worden gemeten; 20 de informatie van de verplaatsingssensoren wordt gebruikt om met behulp van een controller een zodanige kracht middels de voice coils op het tussenlichaam uit te oefenen dat de hiermee verbonden spiegel de gewenste tip, tilt en Z 25 verplaatsing maakt.1. The invention relates to an optical instrument, characterized in that: a mirror is connected to a test frame such that the mirror surface follows every tip and tilt movement of this frame; this intermediate body in its plane free of play is fixed by at least three tangential supports, while there is still the freedom to make a tip, tilt and Z displacement; the tip, tilt and Z displacement of this intermediate body is realized by means of a minimum of three voice coils which exert forces on this intermediate body; the tip, tilt and Z displacements are measured directly on the mirror; The information from the displacement sensors is used to exert such a force on the intermediate body by means of the voice coils that the mirror connected thereto makes the desired tip, tilt and Z displacement. 2. Een inrichting volgens conclusie 1, met het kenmerk dat de verbinding tussen de spiegel en het tussenlichaam is uitgevoerd met minimaal 3 30 tangentiale elastische elementen die er voor zorgen dat de spiegel spelingsvrij met het tussenlichaam is verbonden, maar toch de mogelijkheid heeft om als gevolg van thermische effecten uit te zetten of the 1039643 krimpen zonder dat er grote krachten optreden tussen spiegel en tussenlichaam waardoor vervorming van het s p i e g e 1 o p p e r v 1 a k wordt vermeden.2. A device as claimed in claim 1, characterized in that the connection between the mirror and the intermediate body is designed with at least 3 tangential elastic elements which ensure that the mirror is connected to the intermediate body without play, but still has the option of expand or shrink the 1039643 without the occurrence of large forces between the mirror and the intermediate body, thereby avoiding deformation of the mirror surface. 3. Een inrichting volgens een der vorige conclusies, met het kenmerk dat de verbinding tussen de spiegel en het tussenlichaam is uitgevoerd met minimaal 3 tangentiale elastische elementen die er voor zorgen dat deformaties van het tussenlichaam, bijvoorbeeld 10 als gevolg van de a c t u a t o r k r a c h t e n , niet leidt tot deformaties van de spiegel.A device according to any one of the preceding claims, characterized in that the connection between the mirror and the intermediate body is made with at least 3 tangential elastic elements which ensure that deformations of the intermediate body, for example as a result of the actuator forces, do not lead to deformations of the mirror. 4. Een inrichting volgens conclusie 2 of 3 waarbij de verbinding tussen spiegel en tussenlichaam niet door 15 middel van 3 tangentiale elastische elementen wordt verzorgd, maar op een andere manier een ontkoppeling in krachten wordt gerealiseerd tussen beide onderdelen.4. A device according to claim 2 or 3, wherein the connection between the mirror and the intermediate body is not provided by means of 3 tangential elastic elements, but in a different way a decoupling of forces is realized between the two parts. 5. Een inrichting volgens conclusie 1, met het kenmerk dat het spoeldeel van de voice coil met de elektrische verbindingen gemonteerd zit op het niet beweegbare vaste deel van de constructie waardoor er geen slijtage aan de kabels optreedt en het 25 gedissipeerde vermogen van de spoel beter kan worden afgevoerd.5. A device as claimed in claim 1, characterized in that the coil part of the voice coil with the electrical connections is mounted on the non-movable fixed part of the construction so that no wear to the cables occurs and the dissipated power of the coil is better can be disposed of. 6. Een inrichting volgens conclusie 1, met het kenmerk dat er in plaats van een voice coil een ander type 30 krachtgenerator wordt gebruikt.A device according to claim 1, characterized in that a different type of power generator is used instead of a voice coil. 7. Een inrichting volgens conclusie 1, met het kenmerk dat er in plaats van een voice coil een lineaire spindel of ander type verplaatsingsgenerator wordt gebruikt.A device according to claim 1, characterized in that a linear spindle or other type of displacement generator is used instead of a voice coil. 8. Een inrichting volgens conclusie 1, met het kenmerk 5 dat de tip, tilt en Z verplaatsingen niet middels v e r p 1 a a t s i n g s s e n s o r e n op de spiegel worden gemeten, maar op een andere manier. 10 10396*3A device as claimed in claim 1, characterized in that the tip, tilt and Z displacements are not measured on the mirror by means of p, but in a different way. 10 10396 * 3
NL1039643A 2012-06-01 2012-06-01 Optical chopper with combined tip/tilt movement. NL1039643C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL1039643A NL1039643C2 (en) 2012-06-01 2012-06-01 Optical chopper with combined tip/tilt movement.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1039643 2012-06-01
NL1039643A NL1039643C2 (en) 2012-06-01 2012-06-01 Optical chopper with combined tip/tilt movement.

Publications (1)

Publication Number Publication Date
NL1039643C2 true NL1039643C2 (en) 2013-12-04

Family

ID=46845968

Family Applications (1)

Application Number Title Priority Date Filing Date
NL1039643A NL1039643C2 (en) 2012-06-01 2012-06-01 Optical chopper with combined tip/tilt movement.

Country Status (1)

Country Link
NL (1) NL1039643C2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0790512A1 (en) * 1996-02-13 1997-08-20 EL.EN. S.p.A. Device and method for deflecting a laser beam by means of a single mirror
EP1676776A1 (en) * 2004-12-28 2006-07-05 Alcatel Device for supporting elements of a spacecraft equipment with flexible deployable blades
US20090009742A1 (en) * 2007-05-11 2009-01-08 Yoichi Arai Optical element driving apparatus, barrel, exposure apparatus and device manufacturing method
US20090225382A1 (en) * 2008-03-06 2009-09-10 Miller Warren H Mirror scanning system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0790512A1 (en) * 1996-02-13 1997-08-20 EL.EN. S.p.A. Device and method for deflecting a laser beam by means of a single mirror
EP1676776A1 (en) * 2004-12-28 2006-07-05 Alcatel Device for supporting elements of a spacecraft equipment with flexible deployable blades
US20090009742A1 (en) * 2007-05-11 2009-01-08 Yoichi Arai Optical element driving apparatus, barrel, exposure apparatus and device manufacturing method
US20090225382A1 (en) * 2008-03-06 2009-09-10 Miller Warren H Mirror scanning system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Concentric Pivot Suspension for a Reaction-Less Beam Steering Mirror Assy", ABSTRACT OF NEW TECHNOLOGY FROM THE AIR FORCE SYSTEMS COMMAND,, 1 January 1981 (1981-01-01), pages 1 - 2, XP001661093 *

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Effective date: 20170701