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What is the difference between a passive sensor and an active sensor?
Wiki User
∙ 13y ago
active sensors are sensors that transmit some kind of energy ( microwave , sound , light , .... ) into the environment in order to detect the changes that occur on the transmitted energy . That means it transmits and detect at the same time . But passive sensors don't transmit energy but only detects the energy transmitted from an energy source, e.g. motion detectors which are mostly passive infrared sensors.
Wiki User
∙ 13y ago
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