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A semiconductor detector is a device that uses a semiconductor (usually silicon or germanium) to detect traversing charged particles or the absorption of photons. In the field of particle physics, these detectors are usually known as silicon detectors.
A motion detector is an electronic device that detects the physical movement in a given area/ designated locations and it transforms motion into an electric signal. Motion sensors are commonly used in security systems as triggers for automatic lights or trips for remote alarms and similar applications.