GB928564A - Improvements in or relating to devices for determining the displacement of an objectrelative to another - Google Patents

Improvements in or relating to devices for determining the displacement of an objectrelative to another

Info

Publication number
GB928564A
GB928564A GB2840061A GB2840061A GB928564A GB 928564 A GB928564 A GB 928564A GB 2840061 A GB2840061 A GB 2840061A GB 2840061 A GB2840061 A GB 2840061A GB 928564 A GB928564 A GB 928564A
Authority
GB
United Kingdom
Prior art keywords
grating
displacement
phase
sin
proportional
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
GB2840061A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB928564A publication Critical patent/GB928564A/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
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/06—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness specially adapted for measuring length or width of objects while moving
    • G01B21/065—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness specially adapted for measuring length or width of objects while moving for stretchable materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/36—Forming the light into pulses
    • G01D5/38—Forming the light into pulses by diffraction gratings

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Transform (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

928,564. Displacement measuring systems. PHILIPS ELECTRICAL INDUSTRIES Ltd. Aug. 4, 1961 [Aug. 9, 1960], No. 28400/61. Class 40 (1). Signals resulting from the passage of MoirÚ fringes over photo-cell 6 during movement of diffraction grating 1 are phase-modulated by vibrating reference grating 2 and the modulated and modulating signals are used to produce two waveforms differing in phase by 90 degrees to represent the extent and direction of movement of grating 1. The outputs of devices 10, 11 are proportional to sin #t and cos 2#t, where sin #t is the modulating signal, and the outputs at H, F derived from multiplicative detectors 12, 13 and filters 14, 15 are proportional to sin #x and cos #x, where # is proportional to the velocity of grating 1 and x is the displacement of grating 1. Waveforms differing in phase by 90 degrees may alternatively be produced by the gating circuit of Fig. 4 (not shown). Phase modulation may also be effected by vibrating a mirror which is used to superimpose an image of grating 1 on the grating in order to produce the MoirÚ fringes. The sense and extent of the displacement may be displayed on a cathode-ray tube or by means of a counter.
GB2840061A 1960-08-09 1961-08-04 Improvements in or relating to devices for determining the displacement of an objectrelative to another Expired GB928564A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL254695 1960-08-09

Publications (1)

Publication Number Publication Date
GB928564A true GB928564A (en) 1963-06-12

Family

ID=19752517

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2840061A Expired GB928564A (en) 1960-08-09 1961-08-04 Improvements in or relating to devices for determining the displacement of an objectrelative to another

Country Status (2)

Country Link
CH (1) CH412356A (en)
GB (1) GB928564A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710124A (en) * 1970-03-25 1973-01-09 Nat Res Dev Optical measuring apparatus comprising oscillator and phase comparator
EP1528680A1 (en) * 2003-11-03 2005-05-04 Metronic AG Pulse generator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332473A (en) * 1979-01-31 1982-06-01 Tokyo Shibaura Denki Kabushiki Kaisha Apparatus for detecting a mutual positional relationship of two sample members
JPS62132104A (en) * 1985-12-04 1987-06-15 Futaba Corp Length measuring apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710124A (en) * 1970-03-25 1973-01-09 Nat Res Dev Optical measuring apparatus comprising oscillator and phase comparator
EP1528680A1 (en) * 2003-11-03 2005-05-04 Metronic AG Pulse generator
US7214930B2 (en) 2003-11-03 2007-05-08 Kba-Metronic Ag Pulse generator

Also Published As

Publication number Publication date
CH412356A (en) 1966-04-30

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