Omron E3NT-L, Руководство по эксплуатации

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Functions Section 4-1
4-1 Functions
Diffuse reflective sensors in the E3NT type series can be operated with back-
ground and foreground suppression. Genuine window evaluation can also be
set. The distance is evaluated in accordance with the double triangulation
principle. In this case, the distance from the measured object is determined
not only via the intensity of the reflected emitted light, but also via the angle
between the emitter, the measured object and the receiver.
Contrary to sensors with single triangulation, E3NT with double trian-
gulation, allows measured object's direction of motion to be in all three
directions. Thus, the rotatory position of the sensor about its optical
axis can be chosen freely
(see Figure 1 Position of the sensor) .
Figure 1 Position of the sensor
If the light spot is not completely on the same plane target object (min-
imum object size) the distance is not determined and malfunction can
occur
(see Figure 2 Not determined distance) . If necessary a trigger
signal or timer function has to be applied.
Figure 2 Not determined distance
Measured objects are detected only within the user set and strictly limited
sensing zone. Objects outside the sensing zone (depending on the settings, in
the background, in the foreground or outside of a window that is defined by
two user set distance points) are ignored.