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Photoelectric sensors detect the distance, absence or presence of an object by using a light transmitter, often infra-red, and a photoelectric receiver. They are used extensively in industrial manufacturing. There are various types of sensors: through beam, retro-reflective, diffused proximity-sensing, opposed, high-power opposed, polarized and non-polarized retro-reflective, laser, and fixed-field and adjustable-field sensing models.
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