GB2044920B - Optical interferometer - Google Patents

Optical interferometer

Info

Publication number
GB2044920B
GB2044920B GB7943670A GB7943670A GB2044920B GB 2044920 B GB2044920 B GB 2044920B GB 7943670 A GB7943670 A GB 7943670A GB 7943670 A GB7943670 A GB 7943670A GB 2044920 B GB2044920 B GB 2044920B
Authority
GB
United Kingdom
Prior art keywords
mirror
beams
interferometer
detector
partially
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
GB7943670A
Other versions
GB2044920A (en
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.)
Thales Optronics Ltd
Original Assignee
Thales Optronics Ltd
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 Thales Optronics Ltd filed Critical Thales Optronics Ltd
Priority to GB7943670A priority Critical patent/GB2044920B/en
Publication of GB2044920A publication Critical patent/GB2044920A/en
Application granted granted Critical
Publication of GB2044920B publication Critical patent/GB2044920B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/28—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication
    • G01D5/30—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication the beams of light being detected by photocells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B9/00—Measuring instruments characterised by the use of optical techniques
    • G01B9/02—Interferometers
    • G01B9/0209—Low-coherence interferometers

Abstract

A system for checking the angular position of a pivotably-movable mirror 4 comprises a dual-beam zero-path- difference interferometer with a polychromatic light source 2, and a detector 3 of broad-band spectral sensitivity, the dual beams being formed by partially-transmissive/partially- reflective zones 6, 7 on one surface of a plane parallel plate 1 the other surface of which has internally reflective zones 9, 10, mirror 4 forming part of the interferometer and reflecting each of the light beams 12A, 12B. Detector 3 emits an output signal burst the peak value of which denotes when the mirror is in the predetermined angular position which provides a zero path difference for beams 12A, 12B. Different angular positions of the mirror 4 can be checked by arranging a plurality of interferometers having different optical path lengths or alternatively beams 12A, 12B can have a mixture of polychromatic and monochromatic light, the cyclic nature of the images of the latter providing a measure of the angular deviation of the mirror. <IMAGE>
GB7943670A 1979-01-27 1979-12-19 Optical interferometer Expired GB2044920B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7943670A GB2044920B (en) 1979-01-27 1979-12-19 Optical interferometer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7902945 1979-01-27
GB7943670A GB2044920B (en) 1979-01-27 1979-12-19 Optical interferometer

Publications (2)

Publication Number Publication Date
GB2044920A GB2044920A (en) 1980-10-22
GB2044920B true GB2044920B (en) 1983-02-09

Family

ID=26270362

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7943670A Expired GB2044920B (en) 1979-01-27 1979-12-19 Optical interferometer

Country Status (1)

Country Link
GB (1) GB2044920B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE458153B (en) * 1987-07-16 1989-02-27 Polymetric Ab OPTICAL ANGLE METHODON
GB9506790D0 (en) * 1995-04-01 1995-05-24 Renishaw Plc Laser apparatus for the measurement of angular displacement

Also Published As

Publication number Publication date
GB2044920A (en) 1980-10-22

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee