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Principle of operation

Described simply, the SCATEC-2 consists of a laser light source and two photodetectors. The beam is

aimed diagonally at the objects to be detected. Photodetector R is located close to the laser light source

and photodetector V a little further away. The sensor measures the ratio between signal v (light scattered

forward) and signal r (light scattered backward).

The ratio v/r differs widely depending whether the beam strikes on a flat surface or on an edge. When an

edge moves into the laser beam, the direct line of sight from detector V to the point of contact of the laser

Manual SCATEC-2

Version 2021-09

is obstructed, which reduces signal v, and the edge also

increases the backward scattering, causing signal r to

increase. Both effects cause ratio v/r to become substantially

smaller than with a flat surface. If ratio v/r falls below a

specific level, the sensor interprets this as an edge.

This principle of operation clearly demonstrates that:



The orientation of the object to the beam is significant.

An edge facing towards the beam creates a small ratio v/r, in

contrast to an edge facing away from the beam.



Edge detection is independent of the color, as only the

ratio of the light intensities and not the absolute value is used

for detection.

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