GB1168971A - Improvements in or relating to Optical Measurement of Length - Google Patents

Improvements in or relating to Optical Measurement of Length

Info

Publication number
GB1168971A
GB1168971A GB3067966A GB3067966A GB1168971A GB 1168971 A GB1168971 A GB 1168971A GB 3067966 A GB3067966 A GB 3067966A GB 3067966 A GB3067966 A GB 3067966A GB 1168971 A GB1168971 A GB 1168971A
Authority
GB
United Kingdom
Prior art keywords
frequency
changes
crystal
changed
laser
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
GB3067966A
Inventor
Melvin Seymour Cook
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3067966A priority Critical patent/GB1168971A/en
Publication of GB1168971A publication Critical patent/GB1168971A/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
    • G01B9/02002—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
    • 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)
  • Instruments For Measurement Of Length By Optical Means (AREA)

Abstract

1,168,971. Digital measurement of distance. M. S. COOK. 5 July, 1967 [8 July, 1966], No. 30679/66. Heading G4H. [Also in Divisions G2, H1 and H4] Light of variable frequency is transmitted to an interferometer, and the changes in the interference fringes are counted as the frequency is varied over a known range. In the form of Fig. 1 the distance between two points A, B is determined by positioning a mirror 2a, 2b at each of the points to form a Fabry- Perot etalon arrangement, which is illuminated to produce an interference fringe pattern by a radiation source 1, the frequency of which can be changed from a first value to a second value in a continuous sweep, the number of changes in the fringe pattern being counted during the frequency change. The radiation source comprises a laser 1a directing a beam on to a crystal 1b e.g. of lithium metaniobate which is contained in a temperature controlled chamber 1 A heater 1d is connected to a control source 1e to change the temperature of the crystal. Part of the laser beam is changed to a different frequency by the crystal. The laser frequency is blocked by a filter 1f leaving only the crystal frequency which is changed by changing the temperature of operation. As it changes, the interference pattern at mirror 2b also changes, the number of changes being counted by a photo-detector 3 and counter 4. The value in the counter is proportional to the distance apart of the mirrors. In a modification the variable frequency radiation source is a laser having a coil placed round the tube which, when it is energized, causes a splitting of the light into two components having opposite circular polarization, one of which is blocked. The other has a single frequency which is changed by changing the field of the coil.
GB3067966A 1966-07-08 1966-07-08 Improvements in or relating to Optical Measurement of Length Expired GB1168971A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3067966A GB1168971A (en) 1966-07-08 1966-07-08 Improvements in or relating to Optical Measurement of Length

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3067966A GB1168971A (en) 1966-07-08 1966-07-08 Improvements in or relating to Optical Measurement of Length

Publications (1)

Publication Number Publication Date
GB1168971A true GB1168971A (en) 1969-10-29

Family

ID=10311431

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3067966A Expired GB1168971A (en) 1966-07-08 1966-07-08 Improvements in or relating to Optical Measurement of Length

Country Status (1)

Country Link
GB (1) GB1168971A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3142164A1 (en) * 1980-10-27 1982-06-16 Rosemount Engineering Co. Ltd., Bognor Regis, Sussex DEVICE FOR MEASURING PRESSURE DIFFERENCES
GB2129124A (en) * 1982-10-16 1984-05-10 Ferranti Plc Aligning mask with body
GB2161925A (en) * 1984-07-20 1986-01-22 Stc Plc Fibre optic sensor
EP1586867A2 (en) 2004-04-15 2005-10-19 Davidson Instruments Method and apparatus for continuous readout and fabry-perot fiber optic sensor
US7684051B2 (en) 2006-04-18 2010-03-23 Halliburton Energy Services, Inc. Fiber optic seismic sensor based on MEMS cantilever
US7743661B2 (en) 2006-04-26 2010-06-29 Halliburton Energy Services, Inc. Fiber optic MEMS seismic sensor with mass supported by hinged beams
US7782465B2 (en) 2005-03-16 2010-08-24 Halliburton Energy Services, Inc. High intensity fabry-perot sensor
US7787128B2 (en) 2007-01-24 2010-08-31 Halliburton Energy Services, Inc. Transducer for measuring environmental parameters
US7835598B2 (en) 2004-12-21 2010-11-16 Halliburton Energy Services, Inc. Multi-channel array processor
US7864329B2 (en) 2004-12-21 2011-01-04 Halliburton Energy Services, Inc. Fiber optic sensor system having circulators, Bragg gratings and couplers
US8115937B2 (en) 2006-08-16 2012-02-14 Davidson Instruments Methods and apparatus for measuring multiple Fabry-Perot gaps

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3142164A1 (en) * 1980-10-27 1982-06-16 Rosemount Engineering Co. Ltd., Bognor Regis, Sussex DEVICE FOR MEASURING PRESSURE DIFFERENCES
GB2129124A (en) * 1982-10-16 1984-05-10 Ferranti Plc Aligning mask with body
GB2161925A (en) * 1984-07-20 1986-01-22 Stc Plc Fibre optic sensor
EP1586867A2 (en) 2004-04-15 2005-10-19 Davidson Instruments Method and apparatus for continuous readout and fabry-perot fiber optic sensor
EP1586867A3 (en) * 2004-04-15 2006-09-13 Davidson Instruments Method and apparatus for continuous readout and fabry-perot fiber optic sensor
US7940400B2 (en) 2004-04-15 2011-05-10 Halliburton Energy Services Inc. Method and apparatus for continuous readout of fabry-perot fiber optic sensor
US7835598B2 (en) 2004-12-21 2010-11-16 Halliburton Energy Services, Inc. Multi-channel array processor
US7864329B2 (en) 2004-12-21 2011-01-04 Halliburton Energy Services, Inc. Fiber optic sensor system having circulators, Bragg gratings and couplers
US7782465B2 (en) 2005-03-16 2010-08-24 Halliburton Energy Services, Inc. High intensity fabry-perot sensor
US7684051B2 (en) 2006-04-18 2010-03-23 Halliburton Energy Services, Inc. Fiber optic seismic sensor based on MEMS cantilever
US7743661B2 (en) 2006-04-26 2010-06-29 Halliburton Energy Services, Inc. Fiber optic MEMS seismic sensor with mass supported by hinged beams
US8115937B2 (en) 2006-08-16 2012-02-14 Davidson Instruments Methods and apparatus for measuring multiple Fabry-Perot gaps
US7787128B2 (en) 2007-01-24 2010-08-31 Halliburton Energy Services, Inc. Transducer for measuring environmental parameters

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