FR2487970A1 - Auto collimator rotation measuring process - uses afocal optical system having unity magnification placed in optical beam of mirror and auto-collimator - Google Patents
Auto collimator rotation measuring process - uses afocal optical system having unity magnification placed in optical beam of mirror and auto-collimator Download PDFInfo
- Publication number
- FR2487970A1 FR2487970A1 FR8016912A FR8016912A FR2487970A1 FR 2487970 A1 FR2487970 A1 FR 2487970A1 FR 8016912 A FR8016912 A FR 8016912A FR 8016912 A FR8016912 A FR 8016912A FR 2487970 A1 FR2487970 A1 FR 2487970A1
- Authority
- FR
- France
- Prior art keywords
- mirror
- afocal
- collimator
- optical system
- auto
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0018—Measuring arrangements characterised by the use of mechanical techniques for measuring key-ways
Abstract
Description
Les systèmes optiques de métrologie, particulièrement de métrologie angulaire, utilisent pour mesurer des angles de rotation de miroir des autocollimateurs visuels ou photo-électriques dont les principes et les réalisations sont connus. Optical metrology systems, particularly angular metrology, use visual or photoelectric stickers, the principles and achievements of which are known, to measure mirror rotation angles.
Dans le cas particulier de la métrologie angulaire pour mesure de rotations de miroirs, ces systèmes ont tous l'inconvénient d'avoir une amplitude de champ angulaire de mesure qui est inversement proportionnel à la distance de mesure, c'est-à-dire à la distance séparant l'objectif de sortie de l'autocollimateur, du miroir à mesurer. In the particular case of angular metrology for measuring mirror rotations, these systems all have the disadvantage of having an amplitude of angular field of measurement which is inversely proportional to the measurement distance, i.e. the distance from the exit objective of the sticker, from the mirror to be measured.
La présente invention a pour but de pallier cet inconvénient. The object of the present invention is to overcome this drawback.
En effet, dans le cas, par exemple, de mesures de rectitude de glissières de machines-outils, les bancs à mesurer peuvent atteindre et dépasser dix mètres, d'où l'intérêt de la présente invention. Indeed, in the case, for example, of straightness measurements of machine tool slides, the benches to be measured can reach and exceed ten meters, hence the interest of the present invention.
L'invention consiste à placer dans le faisceau optique entre autocollimateur et miroir un système optique afocal appelé relais pupillaire. The invention consists in placing an afocal optical system called pupillary relay in the optical beam between the stickers and the mirror.
Les caractéristiques et avantages de la présente invention ressortiront de la description qui va suivre faite en regard du dessin annexé dont la figure unique est un schéma représentatif de l'application nouvelle constituée par l'invention. The characteristics and advantages of the present invention will emerge from the description which follows, given with regard to the appended drawing, the single figure of which is a diagram representative of the new application constituted by the invention.
Dans la forme de réalisation schématisée à la figure du dessin, le système optique afocal RP est constitué d'une série de quatre lentilles LI, L2, L3, L4, toutes identiques, alignées dans un même tube et agencées de façon que l'ensemble restitue d'un objet à l'infini, une image également à l'infini, et de grossissement +1. En d'autres termes, tout rayon lumineux rentrant avec un angle a sur son axe de symétrie, sort avec le même angle et donc le même sens. Les distances focales et les positions respectives de ces quatre lentilles peuvent être facilement agencées suivant des lois connues de façon qu'un rayon passant par F1 foyer centré de L1 sorte en F'4 foyer postérieur de L4 en faisant un angle égal avec l'axe. In the embodiment shown schematically in the figure of the drawing, the afocal RP optical system consists of a series of four lenses LI, L2, L3, L4, all identical, aligned in the same tube and arranged so that the assembly restores from an object to infinity, an image also to infinity, and of magnification +1. In other words, any light ray returning with an angle a on its axis of symmetry, leaves with the same angle and therefore the same direction. The focal distances and the respective positions of these four lenses can be easily arranged according to known laws so that a ray passing through F1 centered focal point of L1 leaves F'4 posterior focal point of L4 at an equal angle with the axis .
Un tel système est déjà connu mais l'invention consiste en son application très particulière pour raccourcir une distance d'autocollimation. Such a system is already known, but the invention consists in its very specific application for shortening a distance of collimation.
On voit en effet que si on place un miroir M en
F'4 dont on veut mesurer la rotation par un autocollimateur visuel ou photo-électrique A, ledit autocollimateur étant centré sur l'axe connu du système optique afocal RP auquel il est fait appel conformément à l'invention, ledit système afocal exécute un transfert optique du miroir M de F'4 en F1 puisque toutes les rotations des rayons autour du point F'4 sont identiquement reproduites en F1. La distance d'autocollimation est donc réduite de la longueur F'4 F1 ce qui permet de conserver un champ de mesure important pour un miroir éloigné.We see indeed that if we place a mirror M in
F'4 whose rotation is to be measured by a visual or photoelectric stickers A, said stickers being centered on the known axis of the afocal RP optical system which is used in accordance with the invention, said afocal system performs a transfer optic of the mirror M of F'4 in F1 since all the rotations of the rays around the point F'4 are identically reproduced in F1. The distance of collimation is therefore reduced by the length F'4 F1, which makes it possible to maintain a large measurement field for a distant mirror.
On voit également, et c'est là un des aspects de l'invention, que si le tube contenant les quatre lentilles du système afocal RP considéré est rigide, une petite rotation quelconque de ce tube autour de trois axes orthogonaux de référence ne détruit pas la précision du report d'angle, du moment que le miroir M reste sensiblement en F'4. De plus, la longueur de ce tube peut, en calculant judicieusement les focales des lentilles, être suffisamment longue.Toutefois, si par exemple pour de grandes machines-outils (sans que ce domaine soit limitatif d'application de l'invention) on veut travailler à plus grande distance, l'invention prévoit, selon une forme de réalisation non représentée, d'aligner un certain nombre de dispositifs identiques, en assurant une coincidence très grossière F'4 avec F1 du tube suivant, et en assurant un alignement très approximatif (une erreur d'alignement n'entache pas la mesure). We also see, and this is one aspect of the invention, that if the tube containing the four lenses of the afocal RP system considered is rigid, any small rotation of this tube around three orthogonal reference axes does not destroy the precision of the angle transfer, provided that the mirror M remains substantially at F'4. In addition, the length of this tube can, by judiciously calculating the focal lengths of the lenses, be sufficiently long. However, if for example for large machine tools (without this field being limiting of application of the invention) it is desired working at a greater distance, the invention provides, according to an embodiment not shown, to align a certain number of identical devices, by ensuring a very rough coincidence F'4 with F1 of the next tube, and by ensuring a very alignment approximate (an alignment error does not affect the measurement).
Ainsi, avec plusieurs tubes, on peut raccourcir de plusieurs mètres la distance d'autocollimation, et travailler, par exemple à dix mètres, avec un champ correspondant à un miroir placé à trois ou quatre mètres. Thus, with several tubes, one can shorten by several meters the distance of collimation, and work, for example to ten meters, with a field corresponding to a mirror placed at three or four meters.
Il est bien entendu que la présente invention n'a été décrite et représentée qutà titre d'exemple préférentiel et que l'on pourra apporter des équivalences dans ses éléments constitutifs sans, pour autant, sortir du cadre de ladite invention qui est défini dans les revendications qui suivent. It is understood that the present invention has only been described and shown as a preferred example and that it is possible to provide equivalences in its constituent elements without, however, departing from the scope of said invention which is defined in the claims that follow.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8016912A FR2487970A1 (en) | 1980-07-31 | 1980-07-31 | Auto collimator rotation measuring process - uses afocal optical system having unity magnification placed in optical beam of mirror and auto-collimator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8016912A FR2487970A1 (en) | 1980-07-31 | 1980-07-31 | Auto collimator rotation measuring process - uses afocal optical system having unity magnification placed in optical beam of mirror and auto-collimator |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2487970A1 true FR2487970A1 (en) | 1982-02-05 |
FR2487970B1 FR2487970B1 (en) | 1985-02-08 |
Family
ID=9244748
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8016912A Granted FR2487970A1 (en) | 1980-07-31 | 1980-07-31 | Auto collimator rotation measuring process - uses afocal optical system having unity magnification placed in optical beam of mirror and auto-collimator |
Country Status (1)
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FR (1) | FR2487970A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0643282A1 (en) * | 1993-09-13 | 1995-03-15 | Sfim Optronique Pour La Defense Et Le Spatial | Optical device for measuring transversal offset |
US10288248B1 (en) | 2017-12-14 | 2019-05-14 | Valeo North America, Inc. | Device for automotive lighting |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2515587A1 (en) * | 1974-04-11 | 1975-10-30 | Secretary Trade Ind Brit | DEVICE FOR DISPLAYING DEVIATIONS OF A POSITIONAL REFERENCE ELEMENT FROM COVERAGE WITH A REFERENCE AXIS |
-
1980
- 1980-07-31 FR FR8016912A patent/FR2487970A1/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2515587A1 (en) * | 1974-04-11 | 1975-10-30 | Secretary Trade Ind Brit | DEVICE FOR DISPLAYING DEVIATIONS OF A POSITIONAL REFERENCE ELEMENT FROM COVERAGE WITH A REFERENCE AXIS |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0643282A1 (en) * | 1993-09-13 | 1995-03-15 | Sfim Optronique Pour La Defense Et Le Spatial | Optical device for measuring transversal offset |
FR2710146A1 (en) * | 1993-09-13 | 1995-03-24 | Matra Defense | Optical device for measuring transverse deviation. |
US10288248B1 (en) | 2017-12-14 | 2019-05-14 | Valeo North America, Inc. | Device for automotive lighting |
Also Published As
Publication number | Publication date |
---|---|
FR2487970B1 (en) | 1985-02-08 |
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