Indication of interference band pattern - Metrology & Quality Control

Q.  What does the following interference band pattern indicate?
- Published on 07 Aug 15
MQC


a. Gauge has taper along its large edge
b. Gauge has taper along its short corner
c. Flat gauge
d. Bands have same direction but the pitch is different

ANSWER: Gauge has taper along its short corner

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    Discussion

  • Sravanthi   -Posted on 26 Oct 15
    - National Physics Laboratory designed NPL flatness interferometer to check flatness of the surfaces.

    - Monochromatic green light if focused on a pin hole. It gives intense point source of monochromatic light on the focal plane of collimating lens. Fringes are produced when an optical flat is placed below the collimating lens.

    - In the fringe pattern of gauge, having taper along its short corner has same pitch in the fringe pattern but are in different direction.

    - A perfect and flat gauge is indicating by a fringe pattern having two sets of same pitch and same direction.

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