System for measuring and recording three dimensional configuration of object

• US 4,051,483 A
• Filed: 09/03/1976
• Issued: 09/27/1977
• Est. Priority Date: 09/03/1976
• Status: Expired due to Term

• Current Assignee: Fuji Photo Optical Co. Ltd (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Optical Co. Ltd (Fujifilm Holdings Corporation)
• Inventors: Suzuki, Masane
• Primary Examiner(s): Miller, Jr., George H.
• Application Number:
  US05/720,383
• Time in Patent Office: 389 Days
• Field of Search: 346/29, 346/33 A, 33/20 D, 356/2, 356/120, 250/237 G, 235/151
• US Class Current: 346/33.00A
• CPC Class Codes: G01B 11/254 Projection of a pattern, viewing through a pattern, e.g. moiré

Abstract

An encoder for converting a distance to an electric signal is connected with a computer to put a distance signal into the computer. Th encoder is put on a moire pattern obtained by interference between a standard grating and a deformed image of the standard grating deformed by the surface of a three dimensional object. The distance between moire fringes is put into the computer. The computer is supplied with a signal indicting whether the surface is convex or concave. The depth or height of a point on the moire pattern is calculated by the computer, and a contour of the three dimensional object is obtained. An X-Y recorder is connected with the computer to draw the contour of the object.

Claims

1. A three dimensional contour measuring system for measuring and recording the contour of a three dimensional object comprising an encoder for measuring the distance between adjacent moire fringes of a moire obtained by the interference between a standard grating and a deformed image of a standard grating deformed by the surface of a three dimensional object, a computer connected with said encoder for calculating the depth or height of a point on the object on one moire fringe with respect to the depth or height of a point on the object on the moire fringe adjacent to said one moire fringe, signal input means provided in said computer for input of a signal which indicates whether the surface of the object represented by the moire fringes is convex or concave, magnification input means provided in said computer for input of a signal which indicates the magnification of an optical system for projecting the image of the standard grating on the surface of the object, and an X-Y recorder connected with said computer for recording the output of the computer, whereby said X-Y recorder records the contour of the three dimensional object and said computer computes the cross-sectional area and the cross-sectional line length of the object.

2. A system as defined in claim 1 wherein a control circuit for smoothing out the output of the computer is connected between said computer and said X-Y recorder to make an approximation of a curve lying between adjacent points output from the computer.