GB932481A - Improvements in metrology apparatus incorporating optical gratings - Google Patents

Improvements in metrology apparatus incorporating optical gratings

Info

Publication number
GB932481A
GB932481A GB1648459A GB1648459A GB932481A GB 932481 A GB932481 A GB 932481A GB 1648459 A GB1648459 A GB 1648459A GB 1648459 A GB1648459 A GB 1648459A GB 932481 A GB932481 A GB 932481A
Authority
GB
United Kingdom
Prior art keywords
grating
gratings
transparent
reflective
optical gratings
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
GB1648459A
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 GB1648459A priority Critical patent/GB932481A/en
Publication of GB932481A publication Critical patent/GB932481A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

932,481. Electric selective signalling systems. J. GUILD. May 13, 1960 [May 13, 1959], No. 16484/59. Class 40 (1). [Also in Groups XX and XXII] A measuring or control system employing two relatively movable optical gratings is characterized in that one of the gratings consists of diffusely reflective strips separated by black bars. The position of one grating with respect to the second is then determined by passing light through the transparent grating on to the reflective grating, from which it is reflected to again pass through the transparent grating, and photo-electrically counting the moire fringes so produced. This system has the advantage over systems using two transparent gratings that the reflective grating can be made of stainless steel or aluminium which is considerably less fragile than glass, especially where long gratings-for example those attached to machine tool beds-are concerned. Moreover by using metal the grating can be constructed in the form of a plastic tape. Specifications 817,051 and 932,471 are referred to.
GB1648459A 1959-05-13 1959-05-13 Improvements in metrology apparatus incorporating optical gratings Expired GB932481A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1648459A GB932481A (en) 1959-05-13 1959-05-13 Improvements in metrology apparatus incorporating optical gratings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1648459A GB932481A (en) 1959-05-13 1959-05-13 Improvements in metrology apparatus incorporating optical gratings

Publications (1)

Publication Number Publication Date
GB932481A true GB932481A (en) 1963-07-31

Family

ID=10078185

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1648459A Expired GB932481A (en) 1959-05-13 1959-05-13 Improvements in metrology apparatus incorporating optical gratings

Country Status (1)

Country Link
GB (1) GB932481A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368011A1 (en) * 1976-10-15 1978-05-12 Bergkvist Lars A MEASURING DEVICE, ELECTRONIC RIBBON
US4974962A (en) * 1986-07-03 1990-12-04 Renishaw Plc Opto-electronic scale-reading apparatus
US6791699B2 (en) 2000-08-07 2004-09-14 Mitutoyo Corporation Optical displacement-measuring apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368011A1 (en) * 1976-10-15 1978-05-12 Bergkvist Lars A MEASURING DEVICE, ELECTRONIC RIBBON
US4974962A (en) * 1986-07-03 1990-12-04 Renishaw Plc Opto-electronic scale-reading apparatus
US6791699B2 (en) 2000-08-07 2004-09-14 Mitutoyo Corporation Optical displacement-measuring apparatus

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