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Which of the following option is true for the evaluation of the surface by using grazing incident technique with laser beam system?

(a) It can two dimensional profiles with submicron accuracy

(b) It measure half the part surface at a time

(c) It can produce three dimensional profiles with submicron resolution

(d) Video screen is used to view test results

The question was posed to me during an internship interview.

Origin of the question is Grazing Incident Technique to Evaluate Surface Flatness topic in division Machine Vision Systems of Engineering Metrology

1 Answer

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Right answer is (b) It measure half the part surface at a time

Explanation: It measures the whole part surface at one time and produces 2 and 3-D profiles with sub-micron resolution and accuracy. Test results can be viewed with the help of video screen and hard copied on a printer.

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