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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G01B9/02079
Quadrature detection, i.e. detecting relatively phase-shifted signals
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G01B9/02081
simultaneous quadrature detection, e.g. by spatial phase shifting
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