What is an optical instrument? - Metrology & Quality Control

Q.  Which among the following is an optical instrument?
- Published on 07 Aug 15

a. angle dekkor
b. autocollimator
c. both a. and b.
d. none of the above

ANSWER: both a. and b.


  • Sravanthi   -Posted on 13 Oct 15
    Angular dekkor and autocollimator are optical instruments. Angle dekkor is used to measure variations in angular settings. It consists of a collimating lens, prism, microscopic eye piece, glass screen engraved with illuminated scale, etc. This instrument compares readings obtained with slip gauges in contact with the work piece and the zero reading obtained from angle gauge block setup.

    Autocollimator is used to measure small angular tilts. It is also used to test alignment, straightness and flatness of the surfaces. An autocollimator combines telescope and collimator using a single objective lens and converts into single instrument. A beam splitter is used separate beam paths.

    Autocollimators are used to align components and measure deflections in mechanical or optical systems. Air currents between autocollimator and target mirror cause fluctuations in autocollimator readings. Accuracy of the readings is also affected by flatness and reflectivity of the target mirror.

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