Highlights
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Designed a laser micrometer for undulator gap measurement.
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The beam spot size and the linear velocity of the beam spot are measured.
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We get a constant value of spot size at ±3 mm to the focal length of the F-theta lens.
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The measurements are obtained with an accuracy of 3–5 µm.
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Maximum error in the measurement of gap is 3.5% and for solid object is 13%.