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What is the difference between a retroreflective and polarized retroreflective sensor?

A retroflective sensor emits light in various orientations, sends it to a reflector, and receives a signal back. The receiver, colocated with the emitter can sense light presence or absence in any orientation, enabling an output. Targets blocking light from the receiver can be read. Shiny targets, however, are a challenge. Light reflects off the shiny surface, mimicing the reflector, rendering the target invisible to the sensor. A polarized retroreflective sensor, however, uses polarized light as its sensing medium. The light is emitted by the sensor and directed to a reflector that can rotate the polarization by 90 degrees. The receiver, colocated with the emitter, is designed to sense light beams which are polarized 90 degrees to the plane of light sent from the emitter. Thus, only light from the emitter which has been rotated by the reflector can be read by the receiver. Light not aligned to the receiver`s polarization will be ignored. This process allows shiny objects to be read by the receiver.

CTA-ID : 15100
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