GB1285277A - Apparatus for measuring the linear displacement of a moving object - Google Patents

Apparatus for measuring the linear displacement of a moving object

Info

Publication number
GB1285277A
GB1285277A GB5519270A GB5519270A GB1285277A GB 1285277 A GB1285277 A GB 1285277A GB 5519270 A GB5519270 A GB 5519270A GB 5519270 A GB5519270 A GB 5519270A GB 1285277 A GB1285277 A GB 1285277A
Authority
GB
United Kingdom
Prior art keywords
radiation
laser
mirror
detector
beams
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
GB5519270A
Inventor
Jury Vasilievich Demidenkov
Vladimir Kuzmich Prosvetov
Sergei Georgievich Skrotsky
Boris Vasilievich Rybakov
Alexandr Mikhailovich Khromykh
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 GB5519270A priority Critical patent/GB1285277A/en
Publication of GB1285277A publication Critical patent/GB1285277A/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
    • G01B9/0207—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
    • 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
    • G01B9/02003—Interferometers characterised by controlling or generating intrinsic radiation properties using two or more frequencies using beat frequencies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • H01S3/083—Ring lasers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Instruments For Measurement Of Length By Optical Means (AREA)

Abstract

1285277 Polarizing apparatus V DEMIDENKOV V K PROSVETOV S G SKROTSKY B V RYBOKOV and A M KHROMYKH 20 Nov 1970 55192/70 Heading G2J [Also in Divisions H1 H4 and G1] Linear displacements of an object having a mirror attached thereto, are measured by apparatus including: a laser producing radiation at two slightly differing frequencies, the difference frequency being in the r.f. range; a first photodetector receiving the radiation from the laser to produce a phase reference waveform at the difference frequency; a second photo-detector, receiving radiation from the laser which both has and has not been reflected from the mirror, to produce a waveform whose phase is compared with the reference to indicate the displacement. Ring laser as source. In the arrangement of Fig. 1, a ring laser 1 is used with the aid of Faraday effect device 2, to produce two pairs of beams of the two different frequencies. One pair is mixed by mirror 3 and semi-transparent plate 4 for detection by first detector 9. The beams of the other pair are directed to mirror 5 and to mirror 8 on the object 4 (via semi reflecting plate 6), the reflected beams being combined at semi reflector 7 for detection by the second detector 10. The phase comparison is performed by meter 13 after amplification at 11, 12. Linear laser as source. The axial magnetic field applied to laser 14 produces from either end of the device radiation circularly polarized in clockwise and anti-clockwise directions, the radiation from each end containing both frequencies. At one end, the radiation is passed through a polarizer 17 which converts the beam to linearly polarized radiation and detector 18 develops the reference difference frequency signal. At the other end, radiation passes through quarter wave plate 19 providing radiation linearly polarized in two directions at right angles, these beams being separated by Wollaston prism 20 and subsequently combined at detector 26 by optical mixer elements 21-24 after reflection from mirror 24 fixed to the object. Polarizer 25 ensures that all the radiation reaches the detection polarized in the same direction.
GB5519270A 1970-11-20 1970-11-20 Apparatus for measuring the linear displacement of a moving object Expired GB1285277A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5519270A GB1285277A (en) 1970-11-20 1970-11-20 Apparatus for measuring the linear displacement of a moving object

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5519270A GB1285277A (en) 1970-11-20 1970-11-20 Apparatus for measuring the linear displacement of a moving object

Publications (1)

Publication Number Publication Date
GB1285277A true GB1285277A (en) 1972-08-16

Family

ID=10473234

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5519270A Expired GB1285277A (en) 1970-11-20 1970-11-20 Apparatus for measuring the linear displacement of a moving object

Country Status (1)

Country Link
GB (1) GB1285277A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4039260A (en) * 1976-03-22 1977-08-02 Redman Charles M Rotational motion transducer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4039260A (en) * 1976-03-22 1977-08-02 Redman Charles M Rotational motion transducer

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed