Optical proximity sensor SENSOPART

Proximity switches with background suppression FT 20 RLH-PSM4

Scanning distance adjustable from 20 to 60 mm
Laser red light 650 nm
Detection of ultra small parts
Laser protection class 1
Contamination indicator
Teach-in/key lock by push of a button/control line
N.O./N.C. selectable
Also available with 3-pin connector
Switching frequency: 1000 Hz

Different object colours and surfaces can heavily effect the detection behaviour of an energetic switch. With purely energetic evaluation, it is, for example, not possible to detect a black object in front of a white background.The white background reflects more light than the object itself.
In order to deal with such applications reliably, the background suppression procedure was developed. In this procedure, both the light reflected by the background and by the object is evaluated.The light is captured by two different receiver elements. With this procedure, it is possible to reliably detect e.g. a dark object on a light color conveyor belt.
There are two different procedures for the physical realisation of background suppression. In general, a distinction is made between a fixed and adjustable background suppression. With a fixed background suppression, the transmitter and receiver elements are rigidly mounted.
The laser units are particularly suitable for the detection of very small objects. With larger objects, a red-light or infrared sensor should be used. Only the background suppression procedure enables the detection of a dark object on a light conveyor belt.

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