350
Photoelectric Sensors
2
Photoelectric Sensors,
Standard Sensors,
thru-beam sensors
2
.1.4
Photoelectric Sensors,
Standard Sensors,
thru-beam sensors
2
.1.4
Photoelectric Sensors,
Standard Sensors,
retroreflective sensors
2
.1.3
Photoelectric Sensors,
Standard Sensors,
retroreflective sensors
2
.1.3
Photoelectric Sensors,
Standard Sensors,
diffuse mode sensors
2
.1.2
Photoelectric Sensors,
Standard Sensors,
diffuse mode sensors
2
.1.2
Photoelectric Sensors,
Standard Sensors,
diffuse mode sensors with background suppression
2
.1.1
Photoelectric Sensors,
Standard Sensors,
diffuse mode sensors with background suppression
2
.1.1
Photoelectric Sensors,
Standard Sensors,
distance sensors
2
.1.5
Photoelectric Sensors,
Standard Sensors,
fiber optic sensors
2
.1.6
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3.
Retroreflective Sensors
Retroreflective sensors contain an emitter and a
receiver in one housing. The emitted light is re-
flected back to the receiver by a reflector. When
the light beam is interrupted, the output is switched.
R
E
O
R
Retroreflective sensors with polarization filter
A problem typically associated with reflector systems is that shiny
and reflective objects cannot be reliably detected. This problem
is solved through the use of a polarization filter. Linear polarizing
filters are positioned in front of the sensor’s emitter and receiver,
and the polarization levels are aligned perpendicular to one an-
other (see Fig.). These filters create two polarization planes posi-
tioned at 90° from each other. As such, only the light beams from
the corner cube reflectors reach the receiver because it changes
the polarization level of the light, allowing it to pass freely through
the filter in front of the receiver.
Emitter
Receiver
Polarization filter
Reflecting
object
Reflector
Emitter
Receiver
Features:
•
Detects nontransparent objects even with shiny and reflective
surfaces.
•
Clear object detection possible with special sensors
(
G version).
•
Minimal installation effort as electrical connection is required
for the sensor only.
Retroreflective sensors for clear object detection
Retroreflective sensors with reduced exces gain
are used for clear object detection. This results in
increased switching sensitivity with only minimal
absorption through the glass.
Retroreflective sensors with foreground
suppression
These photoelectric sensors ignore all signals
from reflectors and high-gloss reflective objects
positioned closer to the sensor than a preset mini-
mum detection range.
Photoelectric Sensors
