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Functional Principle, Technical Data
optoNCDT 1420
3. Functional Principle, Technical Data
3.1 Short Description
The optoNCDT 1420 uses the principle of optical triangulation, that is, a visible, modulated point of light is
projected onto the target surface.
The diffuse part of the reflection of this point of light is displayed depending on distance on a position-resolv-
ing element (CMOS) by an receiver optic which is arranged to the optical axis of the laser beam in a defined
angle.
A signal processor in the sensor calculates the distance of the point of light on the measuring object to the
sensor by means of the output signal of the CMOS elements. The distance value is linearized and output by
means of the analog or RS422 interface.
SMRRange
optoNCDT
4 mA (SMR)
12 mA (MR)
3 mA
3 mA
Current output
20 mA (EMR)
Digital value
1
262077
643
64877
262078
Range = Measuring range
SMR = Start of measuring range
MR = Midrange
EMR = End of measuring range
Fig. 7 Definition of terms
1) For distance values without zero setting resp. mastering only
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