Topographic, profile or roughness measurements are performed with
distance data measurement. With single-point sensors, i.e. CHRocodile
C, one spot is focused on the surface of the measured object using an
optic with a known chromatic aberration. The reflected light is more
intense for the wavelength in focus on the surface. Reflected light is
spectrally analyzed and the spectral response is a peak centered on
focused wavelengths. The spectral peak positions determine the distance
to the surface information. The distance is calculated and transmitted to
host computer at up to 4KHz frequency See Fig. 2-3.
Fig. 2-3: Chromatic measurement principle, distance measurement
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