GB1233504A - - Google Patents

Info

Publication number
GB1233504A
GB1233504A GB1233504DA GB1233504A GB 1233504 A GB1233504 A GB 1233504A GB 1233504D A GB1233504D A GB 1233504DA GB 1233504 A GB1233504 A GB 1233504A
Authority
GB
United Kingdom
Prior art keywords
pulses
counter
gates
ones
comparators
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
Other languages
English (en)
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 filed Critical
Publication of GB1233504A publication Critical patent/GB1233504A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G01B9/02015—Interferometers characterised by the beam path configuration
    • G01B9/02022—Interferometers characterised by the beam path configuration contacting one object by grazing incidence
    • 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
    • G01B9/02015—Interferometers characterised by the beam path configuration
    • G01B9/02032—Interferometers characterised by the beam path configuration generating a spatial carrier frequency, e.g. by creating lateral or angular offset between reference and object beam
    • 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
    • G01B9/02055—Reduction or prevention of errors; Testing; Calibration
    • G01B9/02056—Passive reduction of errors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lasers (AREA)
  • Instruments For Measurement Of Length By Optical Means (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
GB1233504D 1968-05-17 1969-05-16 Expired GB1233504A (enExample)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH740868A CH493823A (fr) 1968-05-17 1968-05-17 Procédé de mesure de longueurs par interférométrie optique et appareil pour la mise en oeuvre de ce procédé

Publications (1)

Publication Number Publication Date
GB1233504A true GB1233504A (enExample) 1971-05-26

Family

ID=4324663

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1233504D Expired GB1233504A (enExample) 1968-05-17 1969-05-16

Country Status (5)

Country Link
US (1) US3614236A (enExample)
CH (1) CH493823A (enExample)
DE (1) DE1925339A1 (enExample)
FR (1) FR2008773A1 (enExample)
GB (1) GB1233504A (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4572669A (en) * 1979-01-22 1986-02-25 Rockwell International Corporation Method and apparatus for a Fabry-Perot multiple beam fringe sensor
US5218426A (en) * 1991-07-01 1993-06-08 The United States Of America As Represented By The Secretary Of Commerce Highly accurate in-situ determination of the refractivity of an ambient atmosphere

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3374704A (en) * 1964-05-26 1968-03-26 Gen Electric Linear calibrating interferometer
US3377912A (en) * 1965-03-04 1968-04-16 Barnes Eng Co Spectral photometric scanner using a fabry-perot etalon rotated about an axis inclined to the optic axis of the scanner

Also Published As

Publication number Publication date
CH493823A (fr) 1970-07-15
DE1925339A1 (de) 1969-11-27
FR2008773A1 (enExample) 1970-01-23
US3614236A (en) 1971-10-19

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees