Catalog standard photoelectric sensors_eng.pdf - PEPPERL & FUCHS

Catalogue Catalog standard photoelectric sensors_eng.pdf

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Construction and principles of operation of manufacturer of photoelectric sensors

2. Retrorefective sensor

Retroreflective sensor for clear glass detection

Retroreflective sensor with reduced stability control are used for the special application of clear glass detection. This results in increased switching sensitivity with only minor absorption through the glass.

The retroreflective sensor contains the professional transmitter and receiver in a single housing. The light from the transmitter is beamed back from a reflector to the receiver. If the beam of light is interrupted, the switching function is initiated.


	E
	₌	□
	₌	□
		R

Retroreflective sensor with polarization filter

The problem that typically arises for retroreflective systems, that glossy and reflective objects cannot be reliably detected, can be eliminated by using a polarization filter. To do this, a linear polarization filter is placed in front of the transmitter and receiver of the light barrier. The polarization planes of the filter are perpendicular to each other (see fig.). These professional filters determine two polarization planes offset to each other by 90°. In this manner, only light beams from the triple reflector reach the receiver, since the reflector modifies the polarization plane of the light in such a manner that it can pass through the filter in front of the receiver unhindered.

Retroreflective sensor with foreground suppressi-

These retroreflective sensor ignore all signals from reflectors and high-gloss reflective objects that are closer to the sensor than the adjusted minimum detection range.

Reflector


	/	/
	Emitter
	Receiver	9

Polarization filter

Reflecting object

Characteristics:

• Detects opaque objects even with glossy and reflective surfaces.

• It is also possible to detect clear glass with special detection (G-version).

• Minimal time and expense for installation since the electrical connection is only necessary on the light beam switches side.

Subject to reasonable modifications due to technical advances.

Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com