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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.
Although technological advancements have improved the functioning of motion detectors, the basic purpose and system of this device remains the same. A motion detector is basically designed to detect motion or movement in a designated area and may instantly send a signal to the security alarm system.