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GB2012450B - Interferometer systems - Google Patents

Interferometer systems

Info

Publication number
GB2012450B
GB2012450B GB7901090A GB7901090A GB2012450B GB 2012450 B GB2012450 B GB 2012450B GB 7901090 A GB7901090 A GB 7901090A GB 7901090 A GB7901090 A GB 7901090A GB 2012450 B GB2012450 B GB 2012450B
Authority
GB
United Kingdom
Prior art keywords
interferograms
component
difference signals
polarisation
interferometer systems
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
GB7901090A
Other versions
GB2012450A (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.)
Raine K W
Original Assignee
Raine K W
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 Raine K W filed Critical Raine K W
Priority to GB7901090A priority Critical patent/GB2012450B/en
Publication of GB2012450A publication Critical patent/GB2012450A/en
Application granted granted Critical
Publication of GB2012450B publication Critical patent/GB2012450B/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
    • G01B9/02055—Reduction or prevention of errors; Testing; Calibration
    • G01B9/02075—Reduction or prevention of errors; Testing; Calibration of particular errors
    • G01B9/02078—Caused by ambiguity
    • G01B9/02079—Quadrature detection, i.e. detecting relatively phase-shifted signals

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Instruments For Measurement Of Length By Optical Means (AREA)

Abstract

In a Michelson interferometer system arranged to give four output interferograms (1 to 4), two at each orthogonal direction of polarisation, the reflection and transmission coefficients of the interferometer beam splitter (10) at the two polarisation directions are chosen so that the ratios of the a.c. component to the d.c. component are equal in three of the interferograms. Thus d.c. components, can be removed by photoelectrically deriving difference signals from the three interferograms. The difference signals are suitable for use with an automatic, reversible, fringe counting system, e.g. for making distance or velocity measurements. <IMAGE>
GB7901090A 1978-01-13 1979-01-11 Interferometer systems Expired GB2012450B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7901090A GB2012450B (en) 1978-01-13 1979-01-11 Interferometer systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB144878 1978-01-13
GB7901090A GB2012450B (en) 1978-01-13 1979-01-11 Interferometer systems

Publications (2)

Publication Number Publication Date
GB2012450A GB2012450A (en) 1979-07-25
GB2012450B true GB2012450B (en) 1982-04-21

Family

ID=26236746

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7901090A Expired GB2012450B (en) 1978-01-13 1979-01-11 Interferometer systems

Country Status (1)

Country Link
GB (1) GB2012450B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4583855A (en) * 1984-02-17 1986-04-22 Lockheed Missiles & Space Company, Inc. Optical phase measuring apparatus
US4702603A (en) * 1985-07-23 1987-10-27 Cmx Systems, Inc. Optical phase decoder for interferometers
AT397307B (en) * 1990-03-02 1994-03-25 Tabarelli Werner INTERFEROMETERS IN PARTICULAR FOR LENGTH MEASUREMENT
GB9018215D0 (en) * 1990-08-20 1990-10-03 Nat Res Dev Optical apparatus
JP5523664B2 (en) 2007-11-06 2014-06-18 株式会社ミツトヨ Interferometer
CN103760568B (en) * 2014-01-02 2016-04-13 中国工程物理研究院流体物理研究所 A kind of ultrahigh time resolution spatial phase shift surface imaging velocity interferometer

Also Published As

Publication number Publication date
GB2012450A (en) 1979-07-25

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19960111