SE8800097L - PROCEDURES TO PROVIDE AN ACTIVE DISCRIMINATION BETWEEN TWO OPTICAL ROADS AND DEVICE ADAPTED FOR THE PERFORMANCE OF THE PROCEDURE - Google Patents

PROCEDURES TO PROVIDE AN ACTIVE DISCRIMINATION BETWEEN TWO OPTICAL ROADS AND DEVICE ADAPTED FOR THE PERFORMANCE OF THE PROCEDURE

Info

Publication number
SE8800097L
SE8800097L SE8800097A SE8800097A SE8800097L SE 8800097 L SE8800097 L SE 8800097L SE 8800097 A SE8800097 A SE 8800097A SE 8800097 A SE8800097 A SE 8800097A SE 8800097 L SE8800097 L SE 8800097L
Authority
SE
Sweden
Prior art keywords
wave number
measuring
change
discrepancy
transmitter
Prior art date
Application number
SE8800097A
Other languages
Swedish (sv)
Other versions
SE8800097D0 (en
SE460382B (en
Inventor
H Martin
Original Assignee
Geotronics Ab
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 Geotronics Ab filed Critical Geotronics Ab
Priority to SE8800097A priority Critical patent/SE460382B/en
Publication of SE8800097D0 publication Critical patent/SE8800097D0/en
Priority to PCT/SE1989/000009 priority patent/WO1989006781A1/en
Publication of SE8800097L publication Critical patent/SE8800097L/en
Publication of SE460382B publication Critical patent/SE460382B/en

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
    • G01B9/02002—Interferometers characterised by controlling or generating intrinsic radiation properties using two or more frequencies
    • G01B9/02004—Interferometers characterised by controlling or generating intrinsic radiation properties using two or more frequencies using frequency scans
    • 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
    • G01B9/0207—Error reduction by correction of the measurement signal based on independently determined error sources, e.g. using a reference 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
    • G01B2290/60—Reference interferometer, i.e. additional interferometer not interacting with object

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Instruments For Measurement Of Length By Optical Means (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The invention relates to a method and apparatus for measuring an optical distance with the aid of a light beam transmitter (2) which generates a continuous, coherent, electromagnetic beam, at least during a measuring process. This beam is split and transmitted along two beam paths (3, 4, 8, 7 and 3, 4, 5, 6, 7) and the two beams are brought together at a detector (10), where they are added one to the other. The transmitter (2) is caused to change its wave number in time during at least one sequence, in order to determine a discrepancy between the two beam paths. A phase shift corresponding to an instantaneous wave number is registered in an output signal from the detector (10). A measurement of the phase shift, and therewith the discrepancy, is obtained by measuring the number of occurrent interference fringes in a counter (10) and/or by measuring the time during a given sequence. The change in the wave number of the beam transmitted by the transmitter (2) is selected within a predetermined, accurately delimited wave number interval. The discrepancy is determined from the dependency of the phase change on the wave number change and/or the time.
SE8800097A 1988-01-14 1988-01-14 PROCEDURES TO PROVIDE AN ACTIVE DISCRIMINATION BETWEEN TWO OPTICAL ROADS AND DEVICE ADAPTED FOR THE PERFORMANCE OF THE PROCEDURE SE460382B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE8800097A SE460382B (en) 1988-01-14 1988-01-14 PROCEDURES TO PROVIDE AN ACTIVE DISCRIMINATION BETWEEN TWO OPTICAL ROADS AND DEVICE ADAPTED FOR THE PERFORMANCE OF THE PROCEDURE
PCT/SE1989/000009 WO1989006781A1 (en) 1988-01-14 1989-01-13 A method and apparatus for measuring optical distances

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8800097A SE460382B (en) 1988-01-14 1988-01-14 PROCEDURES TO PROVIDE AN ACTIVE DISCRIMINATION BETWEEN TWO OPTICAL ROADS AND DEVICE ADAPTED FOR THE PERFORMANCE OF THE PROCEDURE

Publications (3)

Publication Number Publication Date
SE8800097D0 SE8800097D0 (en) 1988-01-14
SE8800097L true SE8800097L (en) 1989-07-15
SE460382B SE460382B (en) 1989-10-02

Family

ID=20371062

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8800097A SE460382B (en) 1988-01-14 1988-01-14 PROCEDURES TO PROVIDE AN ACTIVE DISCRIMINATION BETWEEN TWO OPTICAL ROADS AND DEVICE ADAPTED FOR THE PERFORMANCE OF THE PROCEDURE

Country Status (2)

Country Link
SE (1) SE460382B (en)
WO (1) WO1989006781A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6934035B2 (en) 2001-12-18 2005-08-23 Massachusetts Institute Of Technology System and method for measuring optical distance
US7365858B2 (en) 2001-12-18 2008-04-29 Massachusetts Institute Of Technology Systems and methods for phase measurements
US7557929B2 (en) 2001-12-18 2009-07-07 Massachusetts Institute Of Technology Systems and methods for phase measurements
US9596993B2 (en) 2007-07-12 2017-03-21 Volcano Corporation Automatic calibration systems and methods of use
EP2171396B1 (en) * 2007-07-12 2020-05-13 Volcano Corporation Apparatus and methods for uniform frequency sample clocking
EP2634594A1 (en) * 2012-03-01 2013-09-04 Leica Geosystems AG Method for determining a change in distance by means of interferometry
DE102014105456B4 (en) * 2014-04-16 2020-01-30 Minikomp Bogner GmbH Method for measuring the outer contour of three-dimensional measuring objects and associated measuring system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4594003A (en) * 1983-07-20 1986-06-10 Zygo Corporation Interferometric wavefront measurement

Also Published As

Publication number Publication date
SE8800097D0 (en) 1988-01-14
SE460382B (en) 1989-10-02
WO1989006781A1 (en) 1989-07-27

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