Our offer of photoelectric sensors provides the wide portfolio of the German Pulsotronic. These sensors can be reflex, polarised reflex, light barriers, trough-beam types. Pulsotronic offers also fiber optic as well as laser sensors.
Reflex light probe
The clocked light of the transmitting diode impinges on the object on which it is reflected diffusely. A part of the reflected light reaches the light receiver situated in the same device. If there is a sufficient receiving energy the output switches (energetic reflex light probe). The maximum range depends on the dimension, colour and surface characteristics of the object. The function of reflex light probes with background suppression is similar to energetic reflex light probes. The difference is that not the quantity but the angle of incidence of the reflected light is evaluated. Thus the dimension, the colour and the surface characteristics of the object hardly influence the switching distance. This is why objects can also be detected without any problem in front of a bright background.
Reflex light barriers (polarized)
The clocked light of the transmitting diode is focussed through a lens and directed on a reflector via a polarisation filter (principle of triple mirror). A part of the light which is reflected there reaches the receiver via another polarisation filter. The arrangement of the filters takes care for only the light which is reflected by the reflector reaching the receiver. This avoids the problem that bright and shining objects are not detected due to direct reflection. An object interrupting the course of beam from the transmitter to the reflector causes the switching of the output. As simplified versions reflex light barriers are also available without polarisation filter.
One-way light barriers
One-way light barriers consist of a transmitter and a receiver in two separate housings. The arrangement of the transmitter aims at a maximum part of the clocked light reaching the receiver. An interruption of the light beam between transmitter and receiver causes the switching of the output.
Fibre optic devices
Fibre optic devices are mounted in front of the transmitter and the receiver. They work as the extended eye of the photoelectric sensor. As light conductors are very small and flexible, they are appropriate for sensing applications in places thar are difficult to access. There is no transmission of any electric potential. That is why sensing tasks can be realised without special precautions, also in explosive environment and in the presence of high electric potentials (high voltage plants, electric welding machines). Using fiber optic cables the user realises the function of an one-way light barrier as well as of a reflex light probe.
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