GB1184594A - Improvements in and relating to Interferometers. - Google Patents

Improvements in and relating to Interferometers.

Info

Publication number
GB1184594A
GB1184594A GB1242467A GB1242467A GB1184594A GB 1184594 A GB1184594 A GB 1184594A GB 1242467 A GB1242467 A GB 1242467A GB 1242467 A GB1242467 A GB 1242467A GB 1184594 A GB1184594 A GB 1184594A
Authority
GB
United Kingdom
Prior art keywords
interferometer
spacing
white light
interferometers
sub
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
GB1242467A
Inventor
Johannes Schwider
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.)
Akademie der Wissenschaften der DDR
Original Assignee
Akademie der Wissenschaften der DDR
Deutsche Akademie der Wissenschaften zu Berlin
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 Akademie der Wissenschaften der DDR, Deutsche Akademie der Wissenschaften zu Berlin filed Critical Akademie der Wissenschaften der DDR
Priority to GB1242467A priority Critical patent/GB1184594A/en
Publication of GB1184594A publication Critical patent/GB1184594A/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
    • G01B9/02001—Interferometers characterised by controlling or generating intrinsic radiation properties
    • G01B9/02007—Two or more frequencies or sources used for interferometric measurement
    • 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
    • G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
    • G01B11/306—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces for measuring evenness
    • 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
    • G01B9/02062—Active error reduction, i.e. varying with time
    • G01B9/02064—Active error reduction, i.e. varying with time by particular adjustment of coherence gate, i.e. adjusting position of zero path difference in low coherence interferometry
    • G01B9/02065—Active error reduction, i.e. varying with time by particular adjustment of coherence gate, i.e. adjusting position of zero path difference in low coherence interferometry using a second interferometer before or after measuring interferometer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B2290/00—Aspects of interferometers not specifically covered by any group under G01B9/02
    • G01B2290/25—Fabry-Perot in interferometer, e.g. etalon, cavity

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

1,184,594. Interferometers. DEUTSCHE AKADEMIE DER WISSENSCHAFTEN ZU BERLIN. March 16, 1967, No.12424/67. Heading G2J. An arrangement for producing multiple beam interferences in white light with sub-division of the order spacing of the interference fringes into N equal parts, consists of two interferometers in series, the separation of their plates having the ratio 1/N, and the test surface being included as one of the plates in the thinner interferometer while the plate separation in the thicker interferometer is greater than #<SP>2</SP> o K<SP>2</SP>/4#d k N where #d k is the maximum measuring error for the air distance between the test plates, and k is the number of sub-divided spacings between m# o and m# k, where the said sub-divided spacing is the spacing between m# k and m# k-1 . White light from source 1 is focused on to Fabry-Perot interferometer 4 of variable plate separation, light then passing via diaphragm 5 and objective 6 through the wedge interferometer 7 including the test surface. The resulting fringe system is viewed or photographed. An interference filter 9 before the interferometers produces fringes in the vicinity of the white light fringe intensity maxima at the spacing γ/2N. In another form, collimated white light is passed through a Fabry Perot interferometer having the test surface as one plate and then through a wedge interferometer of N times the Fabry-Perot spacing.
GB1242467A 1967-03-16 1967-03-16 Improvements in and relating to Interferometers. Expired GB1184594A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1242467A GB1184594A (en) 1967-03-16 1967-03-16 Improvements in and relating to Interferometers.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1242467A GB1184594A (en) 1967-03-16 1967-03-16 Improvements in and relating to Interferometers.

Publications (1)

Publication Number Publication Date
GB1184594A true GB1184594A (en) 1970-03-18

Family

ID=10004353

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1242467A Expired GB1184594A (en) 1967-03-16 1967-03-16 Improvements in and relating to Interferometers.

Country Status (1)

Country Link
GB (1) GB1184594A (en)

Cited By (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
CN109632099A (en) * 2019-01-29 2019-04-16 苏州大学 A kind of Fabry-Perot interference type imaging spectrometer

Cited By (3)

* 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
CN109632099A (en) * 2019-01-29 2019-04-16 苏州大学 A kind of Fabry-Perot interference type imaging spectrometer
CN109632099B (en) * 2019-01-29 2023-12-15 苏州大学 Fabry-Perot interference imaging spectrometer

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees