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Operation
confocalDT 24x1
Name
State
Description
LED 1
Intensity
Red
Intensity of at least one of the first two peaks in saturation
Yellow
Intensity too low, one or both peaks below recognition
threshold
Green
Signal ok
LED 2
Range
Red
Focus of none (or only one) of the peaks within the lin-
earized or masked range
Yellow
Average value from first and second peak in the midrange
(47.5 … 52.5 %)
Green
OK, focus of at least two peaks within the linearized or
masked range
Error 1
Intensity = 1
Warning, if the intensity of at least one of the first two
peaks is saturated or below recognition threshold
Error 2
Out of range = 1 Focus of none (or only one) of the peaks within the lin-
earized range
Fig. 34 Description of LEDs and error signals for thickness measurements
Thickness can only be calculated correctly if the material has been specified. To balance
the spectral adjustment of the refractive index, a minimum of three refractive index num-
bers for different wavelengths or one refractive index plus the Abbe number are required.
If a target surface is outside the measuring range, the controller provides only one signal
for distance, intensity and focus. This might also happen, if one signal is below the rec-
ognition threshold.
When measuring the thickness of a transparent material, two boundary areas are active.
This means, that two peaks are displayed in the video signal, see
Even if the recognition threshold is just below the saddle between the two peaks, the
controller can determine both distances and use them to calculate the thickness.
Fig. 35
Video signal
web page (thickness measurement)
