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What is the accuracy of scanning laser gauge for objects of 10-50 mm diameter?

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What is the accuracy of scanning laser gauge for objects of 10-50 mm diameter?

(a) ±0.15 μm

(b) ±0.25 μm

(c) ±0.35 μm

(d) ±0.45 μm

The question was posed to me in an internship interview.

This interesting question is from Laser Inspection in division Machine Vision Systems of Engineering Metrology

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Right answer is (b) ±0.25 μm

To explain: Scanning laser gauge can provide an accuracy of ±0.25 μm for objects of 10 to 50 millimeter diameter. It can also be used for objects of diameter from 0.05 to 450 millimeter and offers repeatability of 0.1 μm.

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