GB1475232A - Method of measuring the relative spacing of an object from an optical image correlator - Google Patents

Method of measuring the relative spacing of an object from an optical image correlator

Info

Publication number
GB1475232A
GB1475232A GB298675A GB298675A GB1475232A GB 1475232 A GB1475232 A GB 1475232A GB 298675 A GB298675 A GB 298675A GB 298675 A GB298675 A GB 298675A GB 1475232 A GB1475232 A GB 1475232A
Authority
GB
United Kingdom
Prior art keywords
grating
correlator
lens
receivers
spacing
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
Application number
GB298675A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ernst Leitz Wetzlar GmbH
Original Assignee
Ernst Leitz Wetzlar GmbH
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
Priority claimed from DE2403518A external-priority patent/DE2403518C2/en
Priority claimed from DE2456922A external-priority patent/DE2456922C2/en
Application filed by Ernst Leitz Wetzlar GmbH filed Critical Ernst Leitz Wetzlar GmbH
Publication of GB1475232A publication Critical patent/GB1475232A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G01S17/32—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated

Abstract

1475232 Measuring distance away optically WETZLER GmbH 23 Jan 1975 [25 Jan 1974 2 Dec 1974] 2986/75 Heading G1A [Also in Division H4] Apparatus for measuring the distance of an object from an imaging system 16 of an optical correlator comprises a projector 14 to project an image of an illuminated grating 12 on the object, a system 16 imaging this image on a correlator structure 17 having a fixed orientation relative to grating 12 and viewed by a photoelectric receiver as 19, 20, which, due to a modulator of the light, gives out electrical signals which are evaluated by means giving the spacing of the object from system 16. Either grating 12 or 17 may be made to oscillate as by mechanism 13 and the resulting signal from a push-pull amplifier fed by receivers 19, 20 compared for phase with a signal from mechanism 13. Instead of two receivers 19, 20, a single receiver may be used with an oscillating diaphragm or prism. In Fig. 2a (not shown), the light source 10 is fed from A.C. via rectifier (21). The difference of the receiver signals is a measure of the spacing. The fundamental or an overtone of the signals may be evaluated. Alternatively an LED may be supplied by a pulse generator; or the light modulated by a rotating slotted disc. The number of slots and the speed determines the frequency and phase,relationship of the modulation of images 10 and 10". In Fig. 3 (not shown), lens (30), serves for both projecting and imaging and small mirror (34) at 45 degrees to the lens axis diverts light to grating 17. Rastor 12 is oscillated along the optical axis. In Fig. 4 (not shown), the lens (30) and grating (31) are common to the projector and correlator. In Fig.5 (not shown), a common multiple grating (12') with lines of three different orientations and spacings is used and there are a plurality of receivers orientated correspondingly to the sets of lines. The shape and orientation of the projected image should correspond with that of the object. The apparatus may be used as a blind aid and the correlator lens set to correspond to a particular spacing.
GB298675A 1974-01-25 1975-01-23 Method of measuring the relative spacing of an object from an optical image correlator Expired GB1475232A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2403518A DE2403518C2 (en) 1974-01-25 1974-01-25 Method for measuring the relative distance of an object to a reference system using an optical image correlator, as well as the device for its implementation
DE2456922A DE2456922C2 (en) 1974-12-02 1974-12-02 Device for measuring the relative distance

Publications (1)

Publication Number Publication Date
GB1475232A true GB1475232A (en) 1977-06-01

Family

ID=25766509

Family Applications (1)

Application Number Title Priority Date Filing Date
GB298675A Expired GB1475232A (en) 1974-01-25 1975-01-23 Method of measuring the relative spacing of an object from an optical image correlator

Country Status (4)

Country Link
JP (1) JPS5945921B2 (en)
CH (1) CH595616A5 (en)
FR (1) FR2259371B3 (en)
GB (1) GB1475232A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071667A1 (en) * 1981-08-11 1983-02-16 Karl-Erik Morander Device for determining the real or the virtual distance of a source of light from a measuring plane
DE102013216774A1 (en) * 2013-08-23 2015-02-26 Robert Bosch Gmbh Projector device, monitoring device, method with the monitoring device and computer program

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2610708C3 (en) * 1976-03-13 1978-09-14 Dr. Johannes Heidenhain Gmbh, 8225 Traunreut Optical arrangement
US4384210A (en) * 1981-02-06 1983-05-17 Honeywell Inc. Spatial low pass filter for range finding systems

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2201092C3 (en) * 1972-01-11 1981-05-21 Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar Device for determining the relative position of the plane of maximum amplitude of a spatial frequency

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071667A1 (en) * 1981-08-11 1983-02-16 Karl-Erik Morander Device for determining the real or the virtual distance of a source of light from a measuring plane
DE102013216774A1 (en) * 2013-08-23 2015-02-26 Robert Bosch Gmbh Projector device, monitoring device, method with the monitoring device and computer program

Also Published As

Publication number Publication date
FR2259371B3 (en) 1977-10-21
JPS5945921B2 (en) 1984-11-09
FR2259371A1 (en) 1975-08-22
CH595616A5 (en) 1978-02-15
JPS50108951A (en) 1975-08-27

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee