Spheroid fringe pattern - Metrology & Quality Control

Q.  Which type of surface, has a fringe pattern shown below?
- Published on 07 Aug 15

a. Sphere
b. Cylinder
c. Conical
d. Spheroid

ANSWER: Spheroid


  • Sravanthi   -Posted on 26 Oct 15
    - The flatness of a surface is tested by using an optical flat.

    - A fringe pattern is observed if an optical flat is placed on a metal surface, depending upon the nature of the surface in contact.

    - The pitch of bands formed depend upon the angle of wedge and if the angle of wedge increases, pitch of bands increases.

    - The surface is assumed to be concave, if the fringes obtained move towards the centre and when they move away from the centre, the surface is convex.

Post your comment / Share knowledge

Enter the code shown above:
(Note: If you cannot read the numbers in the above image, reload the page to generate a new one.)