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Gauge blocks measured by interferometry

Instruments calibrated

Gauge blocks from 0.5 – 100 mm (or in inches) made of steel or carbide, grade K.

Measurement range

0.5 mm – 100 mm (or in inches).

Measurement uncertainty

25 nm – 51 nm, increasing with the length of the gauge block.

Calibration method

The measurement principle is interferometry. The gauge blocks are wrung to a reference plate, which serves as one of the reflecting surfaces in the interferometer. The interference pattern across the gauge block and reference plate is measured using two laser wavelengths – red and green – and these measurements are used to calculate the length of the gauge block (the distance from the centre of the block to the surface it is wrung to). It is necessary to know the nominal length of the gauge block within 1 µm to perform these calculations. The nominal length can easily be verified through comparison measurements.

Traceability diagram

Contact information

Helge Karlsson

hka@justervesenet.no

Peter Hansrud-Kjær

phk@justervesenet.no

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