One-Sided Thickness Measurement, Transparent Target; Preset; Material Selection - MICRO-EPSILON confocalDT 2421 Quick Manual

One-Sided Thickness Measurement, Transparent Target

One-Sided Thickness Measurement, Trans-
parent Target
The controller evaluates two signals reflected on the
surfaces. Based on these two signals, the controller cal-
culates the distances from the surfaces and, from this,
derives the thickness.
Align the sensor perpendicularly to the object to
be measured. Make sure that the target is approxi-
mately in the mid of the measuring range (SMR +
0.5 x MR).
i
The light beam must strike the surface of the object
at a perpendicular angle. Otherwise, measure-
ments might be inaccurate.
Displace-
ment 1
Displace-
ment 2
Thickness
SMR MR
One-sided thickness measurement for a transparent
target
confocalDT 2421 / 2422

Preset

Switch to the Home menu.
Select One-sided thickness measurement in
the Measurement configuration menu.
This presetting prompts the controller to use the first
and second peak in the video signal for the thickness
calculation.

Material Selection

Specifying the material is essential for calculating a
correct thickness value. To compensate for the spectral
change of the index of refraction, at least three refractive
indices at different wavelengths or a refractive index and
the Abbe number must be known.
Switch to the Settings > Data recording >
Material selection menu.
Select the material of the target for Layer 1.
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