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Spheroid fringe pattern - Metrology & Quality Control
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Metrology and 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
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Discussion
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.
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