MICRO-EPSILON confocal DT2471, Руководство по эксплуатации

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Page 69
Advanced Settings
confocalDT 24x1
6.17 Edit Material Data Bank
6.17.1 Create Known Material
Use the
Add material
button to add values to or delete values from the controller
material database. Adding new material requires either the refractive index and the Abbe
number vd or three refractive index numbers for wavelengths (even if they more or less
coincide).
Fig. 58 Input mask for material-specific refractive indices
6.17.2 Create Unknown Material
i
Before you can determine the refractive indices of material with unknown object
properties, the exact thickness of the material must be known. The pattern should
as far as possible not much thicker than the minimum measurable thickness of
the sensor type, i.e. approximately 10 ... 20 % of the measuring range, and exactly
coplanar.
Confirm the button Add material in menu Material data base .
Duplicate the refractive indices of the material BK7 e.g. in a transparent measuring
object as a first approximation.
The more similar the refractive indices of the unknown object and the starting material,
the faster and more accurately you determine the refractive indices.
The three refractive indices at different wave lengths are needed for the new material.
SMR MR SMR MR
0.5 * MR
SMR MR
Fig. 59 Video signal at start of measuring range (SMR), midrange (MMR) and end of
measuring range (EMR) for determination of refractive indices
Move the measuring object with the front edge to start of measuring range, see Fig.
59 .
Change to Measurement tab and note the current thickness value.
Move the measuring object to midrange and note the current thickness value at
midrange.