DE2457723C2 - Device for determining the relative position of the plane of maximum amplitude of a spatial frequency - Google Patents
Device for determining the relative position of the plane of maximum amplitude of a spatial frequencyInfo
- Publication number
- DE2457723C2 DE2457723C2 DE19742457723 DE2457723A DE2457723C2 DE 2457723 C2 DE2457723 C2 DE 2457723C2 DE 19742457723 DE19742457723 DE 19742457723 DE 2457723 A DE2457723 A DE 2457723A DE 2457723 C2 DE2457723 C2 DE 2457723C2
- Authority
- DE
- Germany
- Prior art keywords
- spatial frequency
- frequency filter
- amplitude
- lens
- plane
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Optical Communication System (AREA)
Description
4040
Die Anmeldung betrifft eine Einrichtung zur Bestimmung der relativen Lage der Ebene maximaler Amplitude einer Ortsfrequenz im optischen Bild eines Objektes mit den Merkmalen gemäß dem Oberbegriff des Anspruches LThe application relates to a device for determining the relative position of the plane maximal Amplitude of a spatial frequency in the optical image of an object with the features according to the preamble of the claim L
Für eine solche Einrichtung wurde mit der Anmeldung P 23 56 757s bereits vorgeschlagen, in einer ersten Zwischen-Abbildungsebene des Objektivs eine Einstellscheibe zur subjektiven Beobachtung des Objektes mittels des Auges und in einer zweiten Zwischen-Abbildungsebene als Ortsfrequenzfilter ein Prismenraster mit strahlenaufspaltenden Eigenschaften vorzusehen, welches unterschiedliche Pupillenbereiche des Eintrittsobjektivs durchlaufende Lichtflüsse gemeinsam moduliert und aufgespalten dem fotoelektrischen Empfängersystem zuführtFor such a device, the application P 23 56 757s has already been proposed in a first Between the imaging plane of the objective is a focusing screen for subjective observation of the object by means of the eye and in a second intermediate imaging plane as a spatial frequency filter with a prism grid Provide beam-splitting properties, which different pupil areas of the entrance lens Passing light flows are modulated and split up by the photoelectric receiver system feeds
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, vorteilhafte Abwandlungen zum Vorbeschriebenen zu entwickeln.The present invention is based on the object of providing advantageous modifications to what has been described above to develop.
Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Anspruches 1 angegebenen Merkmale gelöstThis object is achieved according to the invention by the features specified in the characterizing part of claim 1 solved
Es hat sich gezeigt, daß auch andere Gitter-Ausführungsformen zur Lösung der zugrunde liegenden Aufgabe geeignet sind. So kann — wenn es die Beleuchtungsverhältnisse erlauben — beispielsweise auch ein Amplitudenraster verwendet werden, das dann trotz des ihm eigenen Lichtverlustes noch zu brauchbaren Meßergebnissen führt. Solche Raster sind in der Herstellung weniger aufwendig als Prismenraster, weil sie sich im fotografischen Kopierverfahren herstellen lassen.It has been shown that other grid embodiments are suitable for solving the underlying task. So can - if it does Allow lighting conditions - for example, an amplitude grid can also be used, which then despite the inherent loss of light, still leads to usable measurement results. Such grids are in the Production is less expensive than prismatic grids because they are produced in a photographic copying process permit.
Bei Verwendung eines solchen, nicht spiegelnden Amplitudenrasters ist die Gegentakt-Anordnung eines zweiten Fotoempfängers bzw. Fotoempfängerpaares nicht ohne weiteres möglich, so daß eine Gleichtaktrejektion entfälltWhen using such a non-reflective amplitude grid, the push-pull arrangement is one second photo receiver or photo receiver pair not readily possible, so that a common mode reflection not applicable
Auch andere Phasengitter als das vorgesehene Prismenraster sind zur Anwendung bei einer Einrichtung der obengenannten Art geeignet.Phase gratings other than the prismatic grid provided are also used in a facility of the type mentioned above.
Schließlich ist es auch möglich, Teilungen mit unregelmäßiger Anordnung von Amplituden- und/oder Phasenmarken zu verwenden, wobei eine elektrische Kreuzkorrelation der bei der fotoelektrischen Abtastung der Teilung entstehenden breitbandigen Signale das Einstellkriterium liefert.Finally, it is also possible to have divisions with an irregular arrangement of amplitude and / or Use phase markers, with an electrical cross-correlation that occurs in photoelectric scanning The broadband signals resulting from the division provide the setting criterion.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19742457723 DE2457723C2 (en) | 1974-12-06 | 1974-12-06 | Device for determining the relative position of the plane of maximum amplitude of a spatial frequency |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19742457723 DE2457723C2 (en) | 1974-12-06 | 1974-12-06 | Device for determining the relative position of the plane of maximum amplitude of a spatial frequency |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2457723A1 DE2457723A1 (en) | 1976-06-10 |
DE2457723C2 true DE2457723C2 (en) | 1983-05-26 |
Family
ID=5932702
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19742457723 Expired DE2457723C2 (en) | 1974-12-06 | 1974-12-06 | Device for determining the relative position of the plane of maximum amplitude of a spatial frequency |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2457723C2 (en) |
-
1974
- 1974-12-06 DE DE19742457723 patent/DE2457723C2/en not_active Expired
Non-Patent Citations (1)
Title |
---|
NICHTS-ERMITTELT |
Also Published As
Publication number | Publication date |
---|---|
DE2457723A1 (en) | 1976-06-10 |
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Legal Events
Date | Code | Title | Description |
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8110 | Request for examination paragraph 44 | ||
AF | Is addition to no. |
Ref country code: DE Ref document number: 2356757 Format of ref document f/p: P |
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D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: WILD LEITZ GMBH, 6330 WETZLAR, DE |