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Which application is ideally suited for two frequency laser interferometer?

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in Engineering Metrology by (829k points)
Which application is ideally suited for two frequency laser interferometer?

(a) Pitch and yaw measurement

(b) Hole diameters

(c) Thickness measurement

(d) Measurement of edge locations

The question was asked in unit test.

My enquiry is from Laser Inspection topic in chapter Machine Vision Systems of Engineering Metrology

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The correct choice is (a) Pitch and yaw measurement

To elaborate: 2 frequency laser interferometer techniques are ideally suitable for measuring linear positioning, pitch, yaw and straightness in two planes. The two-frequency laser head provides, one frequency with a P polarisation i.e. M (measuring) beam and another frequency with an S polarisation i.e. R (reference) beam.

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