Page 71
Advanced Settings
confocalDT 24x1
6.18
Different Peak Selection in the Thickness Measurement Program
i
This function is used, if a material generates peaks in front of or between the ap-
plied peaks caused by thin layers on the measurement object. This function should
be used with care and exclusively by product specialists.
confocal
DT
2451
Measurement program
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Measurement Video signal
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Preferences > Measurement program
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Thickness measurement
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Measurement to be effected:
Highest and second highest peak
Used peak:
Use refractive corrdction:
Selection of material:
Distance measurement
Distance to the first surface
Thickness measurement
Thickness of one layer - distance between the first two peaks
Yes
Vacuum
Fig. 61 Advanced measurement program with individual peak selection
The selection of the peaks determines which areas in the signal are used for the distance
or thickness measurement. If a measurement object contains multiple transparent layers,
a correct measurement result is determined only for the first peak (distance measure-
ment) and the first two peaks (thickness measurement).
Distance measurement
Thickness measurement
first peak
first and second peak
last peak
first and last peak
highest peak
second to last and last peak
highest and second highest peak
Fig. 62 Menu items used peaks
The determination of the peak heights is performed using the light corrected signal. In
the following example the thickness is measured between the highest and second high-
est peak.
Fig. 63 Extract of a video signal with multiple peaks in the measuring range
By default the refractive correction is performed. If more than two peaks are within the
measuring range, an exact refractive correction is performed with the same amount of
peaks only.
Example: 3 peaks, the first or the last peak leaves the measuring range sometimes.
Switch off the refractive correction, because the refractive correction is applied on a dif-
ferent layer, a clear assignment of the material is not possible.
