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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.
Array sensor detects people and objects in motion or at rest. Passive infrared sensors work well when it comes to occupancy or object detection. They can also sense people or objects in motion, which makes them useful in building automation and security systems.