GB895564A - Improvements relating to optical apparatus - Google Patents

Improvements relating to optical apparatus

Info

Publication number
GB895564A
GB895564A GB326259A GB326259A GB895564A GB 895564 A GB895564 A GB 895564A GB 326259 A GB326259 A GB 326259A GB 326259 A GB326259 A GB 326259A GB 895564 A GB895564 A GB 895564A
Authority
GB
United Kingdom
Prior art keywords
line
source
image
plate
holder
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
GB326259A
Inventor
James Dyson
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated 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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB326259A priority Critical patent/GB895564A/en
Priority to FR816935A priority patent/FR1247071A/en
Publication of GB895564A publication Critical patent/GB895564A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
    • G01C15/10—Plumb lines
    • G01C15/105—Optical plumbing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
    • G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
    • G01B11/272—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes using photoelectric detection means
    • 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)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

895,564. Optical aligning apparatus. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Jan. 25, 1960 [Jan. 29, 1959], No. 3262/59. Class 97(1). Optical apparatus for indicating the displacements of a body from a vertical straight line comprises an optically transparent flat plate extending substantially horizontally, a circular diffraction grating formed on one surface of said plate, a horizontal reflecting surface located on one side of said plate, a holder adapted to be attached to said body and to contain a point source of light which is located on the opposite side of said plate so as to project a beam of light in a direction which is substantially normal to said reflecting surface, in such a manner as to produce a line image of said source extending on the opposite side of said plate from the centre point of said diffraction grating and displaced from the vertical reference line through said centre point symmetrically with the line joining the point source to said centre point, together with means for indicating the position of said line image so as to indicate displacements of said holder and said body from said vertical reference line. As shown, the apparatus comprises a holder A attached to a body B, the displacement of which from a vertical straight line is to be measured. The holder A contains a point source of light S and cross wires W both mounted on a rod T operable by a micrometer screw M. The light from the source S falls on diffraction grating G close below which is a reflecting surface formed by a pool of mercury R, so that a line image of the source extends from the centre point C of the grating to a position I disposed symmetrically on the opposite side of a vertical reference line defined by the line through the centre of the grating C. In use the rod T is moved until the cross wires W appear to coincide with the line image at I when viewed through a lens L. By viewing the image I continuously, displacements of the cross wires W from this image will indicate displacement of the box A and body B from the vertical reference line, and such deviations can be measured by the micrometer M. Reference has been directed by the Comptroller to Specification 862,290.
GB326259A 1959-01-29 1959-01-29 Improvements relating to optical apparatus Expired GB895564A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB326259A GB895564A (en) 1959-01-29 1959-01-29 Improvements relating to optical apparatus
FR816935A FR1247071A (en) 1959-01-29 1960-01-28 Advanced optical device, to measure the movements of a body in relation to a vertical line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB326259A GB895564A (en) 1959-01-29 1959-01-29 Improvements relating to optical apparatus

Publications (1)

Publication Number Publication Date
GB895564A true GB895564A (en) 1962-05-02

Family

ID=9755017

Family Applications (1)

Application Number Title Priority Date Filing Date
GB326259A Expired GB895564A (en) 1959-01-29 1959-01-29 Improvements relating to optical apparatus

Country Status (2)

Country Link
FR (1) FR1247071A (en)
GB (1) GB895564A (en)

Also Published As

Publication number Publication date
FR1247071A (en) 1960-11-25

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