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Without any physical contact, a proximity sensor can detect the presence of nearby objects. This is achieved by emitting an electromagnetic field or a beam of electromagnetic radiation (ex. infrared), waits for a return signal or looks for changes in the field. There are a variety of proximity sensors that are dependent on the target (object being sensed). For example, a capacitive or photoelectric sensor might be suitable for a plastic target; an inductive proximity sensor always requires a metal target.