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GB1178972A - Method of and Apparatus for Testing the Angular Position of a Reflecting Surface - Google Patents

Method of and Apparatus for Testing the Angular Position of a Reflecting Surface

Info

Publication number
GB1178972A
GB1178972A GB595566A GB595566A GB1178972A GB 1178972 A GB1178972 A GB 1178972A GB 595566 A GB595566 A GB 595566A GB 595566 A GB595566 A GB 595566A GB 1178972 A GB1178972 A GB 1178972A
Authority
GB
United Kingdom
Prior art keywords
angular position
images
axis
testing
feb
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
GB595566A
Inventor
James Morriss Burch
John William Gates
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.)
NAT RES DEV
National Research Development Corp UK
Original Assignee
NAT RES DEV
National Research Development Corp UK
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 NAT RES DEV, National Research Development Corp UK filed Critical NAT RES DEV
Priority to GB595566A priority Critical patent/GB1178972A/en
Publication of GB1178972A publication Critical patent/GB1178972A/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
    • 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

Landscapes

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

Abstract

1,178,972. Optical testing apparatus. NATIONAL RESEARCH DEVELOPMENT CORP. Feb.8, 1967 [Feb. 10, 1966], No.5955/66. Heading G2J. In apparatus for testing the angular position of a reflecting surface R, white light from source S is passed through a wavefront inversion device I, reflected at surface R and returned through device I, the interference between light components which have suffered an odd number of wavefront inversions respectively in their outward and returns paths through device I being observed at E as an indication of the angular position of surface R. Device I comprises a cylindrical glass block with its longitudinal axis on OO' and having partially reflecting coated spherical end surfaces C, C' with a common focal plane within the block, and equal radii of curvature. Source S is at an external focal plane F of the device, and a beam splitting prism D diverts returning light to an image plane F' for observation. Images 1, and k are selected of which one is invented at surface R, whereby lateral misalignment of surface R from axis OO' may be corrected by bringing the images into coincidence. Tilting of the surface is corrected by observing the spacing of the straight fringes formed by interference between the rays forming images 1, h. Surface R is normal to axis OO' for infinite fringe spring. In a modification, a polariser is included in beam splitter D and a quarter-wave plate Q is placed between device I and surface R to eliminate unwanted reflections.
GB595566A 1966-02-10 1966-02-10 Method of and Apparatus for Testing the Angular Position of a Reflecting Surface Expired GB1178972A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB595566A GB1178972A (en) 1966-02-10 1966-02-10 Method of and Apparatus for Testing the Angular Position of a Reflecting Surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB595566A GB1178972A (en) 1966-02-10 1966-02-10 Method of and Apparatus for Testing the Angular Position of a Reflecting Surface

Publications (1)

Publication Number Publication Date
GB1178972A true GB1178972A (en) 1970-01-28

Family

ID=9805770

Family Applications (1)

Application Number Title Priority Date Filing Date
GB595566A Expired GB1178972A (en) 1966-02-10 1966-02-10 Method of and Apparatus for Testing the Angular Position of a Reflecting Surface

Country Status (1)

Country Link
GB (1) GB1178972A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0055884A3 (en) * 1980-09-16 1983-03-30 The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Optical instrument for measuring the divergence of two approximately colinear optical axes
US5276497A (en) * 1991-01-22 1994-01-04 Asahi Kogaku Kogyo Kabushiki Kaisha Measuring apparatus of mirror surface

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0055884A3 (en) * 1980-09-16 1983-03-30 The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Optical instrument for measuring the divergence of two approximately colinear optical axes
US5276497A (en) * 1991-01-22 1994-01-04 Asahi Kogaku Kogyo Kabushiki Kaisha Measuring apparatus of mirror surface

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