GB9214617D0 - Improvements in or relating to interferometers - Google Patents

Improvements in or relating to interferometers

Info

Publication number
GB9214617D0
GB9214617D0 GB9214617A GB9214617A GB9214617D0 GB 9214617 D0 GB9214617 D0 GB 9214617D0 GB 9214617 A GB9214617 A GB 9214617A GB 9214617 A GB9214617 A GB 9214617A GB 9214617 D0 GB9214617 D0 GB 9214617D0
Authority
GB
United Kingdom
Prior art keywords
noise
measurement
signal
interferometers
relating
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.)
Granted
Application number
GB9214617A
Other versions
GB2268582A (en
GB2268582B (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.)
Roke Manor Research Ltd
Original Assignee
Roke Manor Research Ltd
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 Roke Manor Research Ltd filed Critical Roke Manor Research Ltd
Priority to GB9214617A priority Critical patent/GB2268582B/en
Publication of GB9214617D0 publication Critical patent/GB9214617D0/en
Publication of GB2268582A publication Critical patent/GB2268582A/en
Application granted granted Critical
Publication of GB2268582B publication Critical patent/GB2268582B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G01B9/0207—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

Abstract

An optical interferometer wherein laser noise is reduced or removed by providing an additional optical path (15) in which the noise present can be ascertained and then subtracted from the measurement signal, also containing noise, such that the output signal has an improved signal to noise ratio. The noise may be identified using a-reference interferometer and both the measurement and noise signals may be appropriately processed (11, 24) and filtered (26, 28) before the subtraction stage (30). The system may also be adaptable to other forms of electromagnetic radiation. <IMAGE>
GB9214617A 1992-07-09 1992-07-09 Improvements in or relating to interferometers Expired - Fee Related GB2268582B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9214617A GB2268582B (en) 1992-07-09 1992-07-09 Improvements in or relating to interferometers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9214617A GB2268582B (en) 1992-07-09 1992-07-09 Improvements in or relating to interferometers

Publications (3)

Publication Number Publication Date
GB9214617D0 true GB9214617D0 (en) 1992-08-26
GB2268582A GB2268582A (en) 1994-01-12
GB2268582B GB2268582B (en) 1995-12-20

Family

ID=10718465

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9214617A Expired - Fee Related GB2268582B (en) 1992-07-09 1992-07-09 Improvements in or relating to interferometers

Country Status (1)

Country Link
GB (1) GB2268582B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112424562A (en) * 2018-05-18 2021-02-26 密歇根大学董事会 Path fluctuation monitoring for frequency modulation interferometer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4436922C2 (en) * 1994-10-15 1997-07-31 Jenoptik Technologie Gmbh Interferometer arrangement for frequency and environmental independent length measurement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3706347A1 (en) * 1987-02-27 1988-09-08 Fraunhofer Ges Forschung LASER INTERFEROMETER FOR INTERFEROMETRIC LENGTH MEASUREMENT
FR2650664B1 (en) * 1989-08-01 1991-11-15 Micro Controle INTERFEROMETRY DISPLACEMENT MEASUREMENT DEVICE
GB9018215D0 (en) * 1990-08-20 1990-10-03 Nat Res Dev Optical apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112424562A (en) * 2018-05-18 2021-02-26 密歇根大学董事会 Path fluctuation monitoring for frequency modulation interferometer
CN112424562B (en) * 2018-05-18 2023-07-07 密歇根大学董事会 Path fluctuation monitoring for frequency modulated interferometers

Also Published As

Publication number Publication date
GB2268582A (en) 1994-01-12
GB2268582B (en) 1995-12-20

Similar Documents

Publication Publication Date Title
ES2125602T3 (en) VOCODER ASIC.
ES8105876A1 (en) Optical focussing-error detection system
ATE29609T1 (en) DEVICE FOR CHECKING PRINTED PRODUCTS.
EP0930045A3 (en) Signal processing apparatus and method for an oximeter
FR2388270A1 (en) FLUORESCENCE POLARIMETER
CA2013406A1 (en) Optical detection of a surface motion of an object
DE3477836D1 (en) Thermal deformation measuring system of ceramics and the like
ES2005320A6 (en) System for sensing ions in aqueous solution.
GB2268582B (en) Improvements in or relating to interferometers
SE9201062D0 (en) DETECTOR CIRCUIT
DE3265461D1 (en) Device for the heterodyne detection of an optical image
JPS52122038A (en) Fixed noise elimination of solid image sensor
SE8205840D0 (en) echo canceller
DE3752174T2 (en) NETWORK WITH SIGNAL FORMING
JPS57111838A (en) Optical information reader
SE8205839D0 (en) echo canceller
JPS57171271A (en) Measuring device for quantity of electricity
JPS5584909A (en) Information reading system by laser beam
GR3034263T3 (en) Optical noise source.
JPS6486238A (en) Subtracter
JPS6450203A (en) Reproducing magnetic head circuit
JPS6463882A (en) Magnetic field sensor
EP0591912A3 (en)
SE8203819L (en) DEVICE FOR AUTOMATIC DETECTION OF DEFECTS ON A SURFACE
DE3889009D1 (en) Use of derivatized alkaline phosphatase as standard.

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20110709