Photoelectric Sensors OMRON Technical Guide Manual PDF

Polarization of Light
Light can be represented as a wave that oscillates horizontally Photoelectric Sensors Photoelectric Sensors Manual PDF and
vertically. Photoelectric Sensors almost always use LEDs Photoelectric Photoelectric Sensors Manual Photoelectric Sensors PDF Sensors as the light
source. The light emitted Photoelectric Sensors PDF from LEDs oscillates in the vertical and
horizontal directions and is referred to as unpolarized light. There are
optical filters that constrain the oscillations of unpolarized light to just
one direction. These are known as polarizing filters. Light from an
LED that passes through a polarizing filter oscillates in only one
direction and is referred to as polarized light (or more precisely, linear
polarized light). Polarized light oscillating in one direction (say the
vertical direction) cannot pass through a polarizing filter that
constrains oscillations to a perpendicular direction (e.g., the
horizontal direction). The MSR function on Retro-reflective Sensors
(see page 15) and the Mutual Interference Protection Filter accessory
for Through-beam Sensors operate on this principle.
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