Title:
【発明の名称】表面上に印刷されたまたは取り付けられた格子を使用するモアレ距離測定方法及び装置
Document Type and Number:
Japanese Patent JPH05502731
Kind Code:
A
Abstract:
Method and apparatus are disclosed for providing Moire distance and displacement measurements of a diffusely reflective surface of an object or support. More particularly, a first grating is physically located, formed, or printed on the diffusely reflective surface. An image of the first grating is formed on a second grating by an imaging means for generating a Moire pattern behind the second grating. At an initial position of the diffusely reflective surface relative to the imaging means, the periods of the image of the first grating and the second grating match. Movement of the diffusely reflective surface in a direction normal thereto and away from the initial position produces a spatially varying intensity pattern caused by the Moire between a shifting and changing magnified pattern of the image of the first grating and a pattern of the second grating. The temporal intensity changs in the Moire pattern are detected and are used to produce information related to the instantaneous distance and displacement of the diffusely reflective surface from the initial position.
Inventors:
Greven Kamp, John Yee, Jr.
Rumsel Jay, Palm
Rumsel Jay, Palm
Application Number:
JP51616891A
Publication Date:
May 13, 1993
Filing Date:
September 17, 1991
Export Citation:
Assignee:
Eastman Kodak Company
International Classes:
G01B11/00; G01B11/02; G01D5/36; G01D5/38; G01S17/89; G02B7/28; (IPC1-7): G01B11/00; G01D5/36; G01D5/38
Attorney, Agent or Firm:
Kyozo Yuasa (6 people outside)