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Appendix |Multilayer Measurement, Controller IFC24x1MP
confocalDT 24x1
Deactivating refractive correction
A variety of factors can cause the measurement device to recognize less peaks than
expected (in this example 2 peaks instead of 3, see
):
1
The last peak is located behind the linearized measuring range, the masked
range of the CCD line or not in the CCD line at all.
2
The first peak is located in front of the linearized measuring range, the masked
range of the CCD line or not in the CCD line at all.
3
The distance between any two peaks is too small, the peaks converge and can
not be separated.
At
1
it is possible to allocate glass as material to the correct area and to perform accu-
rate refractive correction. At
2
and
3
errors are introduced due to incorrect material
allocation.
If only
1
appears because of your measurement arrangement, you can use the default
setting: “Use refractive correction: Yes”
Refractive correction is performed, any existing values are displayed, and missing
measurement values receive an error status.
If you don’t know the cause but want to analyze at least the peaks for which no refractive
correction was performed, you deactivate refractive correction. In this case all measure-
ment values are calculated using a refractive correction of 1.0 (vacuum/air), while any
material settings are ignored. Again, any missing measurement values receive an error
status.
If more than the required peaks are recognized, any additional peaks are ignored. For
error-free allocation of refractive correction, please ensure that the first peak in your
measurement arrangement always falls within the measuring range and that no two
peaks converge.
A 4.1.2 Video Signal for Multilayer Measurements
Fig. 76 Video signal, example using 3 peaks
