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How the intensity variation appears at each pixel in the grazing incident technique with laser beam system?

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How the intensity variation appears at each pixel in the grazing incident technique with laser beam system?

(a) As a cosine wave

(b) As a sine wave

(c) Straight line

(d) Hyperbolic

I had been asked this question in homework.

The query is from Grazing Incident Technique to Evaluate Surface Flatness topic in portion Machine Vision Systems of Engineering Metrology

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The correct choice is (b) As a sine wave

Explanation: The intensity variation at each pixel appears as a sine wave and recorded by the microprocessor. It is used to determine its relative phase. The phase differences are used to define the surface topography.

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