Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01B
MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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9/00
Measuring instruments characterised by the use of optical techniques
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G01B9/02055
Reduction or prevention of errors; Testing; Calibration
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G01B9/02056
Passive reduction of errors
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G01B9/02058
by particular optical compensation or alignment elements, e.g. dispersion compensation
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