Page 94
Instruction for Operating
optoNCDT 1700
9.2.6 Surface Roughness
Laser-optical sensors detect the surface using an extremely small laser spot. They also track slight surface
unevenness. In contrast, a tactile, mechanical measurement, e.g. using a caliper, detects a much larger area
of the measurement object. In case of traversing measurements, surface roughnesses of 5 μm and more lead
to an apparent distance change.
Suitable parameters for the averaging number may improve the comparability of optical and mechanical
measurements.
h > 5 µm
Max.
Min.
Ceramic reference surface Structured surface
Recommendation for parameter choice:
- The averaging number should be selected in such a way that a surface area the size of which is compa-
rable to those with mechanical measurements is averaged.
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