SE8800097D0 - PROCEDURE FOR DETERMINING AN ACTIVE DISCRIPTION BETWEEN TWO OPTICAL ROADS AND DEVICE ADAPTED FOR EXECUTION OF THE PROCEDURE - Google Patents
PROCEDURE FOR DETERMINING AN ACTIVE DISCRIPTION BETWEEN TWO OPTICAL ROADS AND DEVICE ADAPTED FOR EXECUTION OF THE PROCEDUREInfo
- Publication number
- SE8800097D0 SE8800097D0 SE8800097A SE8800097A SE8800097D0 SE 8800097 D0 SE8800097 D0 SE 8800097D0 SE 8800097 A SE8800097 A SE 8800097A SE 8800097 A SE8800097 A SE 8800097A SE 8800097 D0 SE8800097 D0 SE 8800097D0
- Authority
- SE
- Sweden
- Prior art keywords
- wave number
- procedure
- measuring
- change
- discrepancy
- Prior art date
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)
- Length Measuring Devices By Optical Means (AREA)
- Instruments For Measurement Of Length By Optical Means (AREA)
- Optical Radar Systems And Details Thereof (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.
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 true SE8800097D0 (en) | 1988-01-14 |
SE8800097L 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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7557929B2 (en) | 2001-12-18 | 2009-07-07 | Massachusetts Institute Of Technology | Systems and methods for phase measurements |
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 |
US9596993B2 (en) | 2007-07-12 | 2017-03-21 | Volcano Corporation | Automatic calibration systems and methods of use |
US8049900B2 (en) | 2007-07-12 | 2011-11-01 | 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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4594003A (en) * | 1983-07-20 | 1986-06-10 | Zygo Corporation | Interferometric wavefront measurement |
-
1988
- 1988-01-14 SE SE8800097A patent/SE460382B/en not_active IP Right Cessation
-
1989
- 1989-01-13 WO PCT/SE1989/000009 patent/WO1989006781A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
SE8800097L (en) | 1989-07-15 |
SE460382B (en) | 1989-10-02 |
WO1989006781A1 (en) | 1989-07-27 |
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