human presence detector

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• Bat detector — The term bat detector is usually used to describe a device used to detect the presence of bats by converting their echolocation ultrasound signals to audible frequencies as they are emitted by the bats. There are other types of detector which… …   Wikipedia

• Smoke detector — A smoke detector is a device that detects smoke, typically as an indicator of fire. Commercial, industrial, and mass residential devices issue a signal to a fire alarm system, while household detectors, known as smoke alarms, generally issue a… …   Wikipedia

• Proximity detector — Proximity detectors are devices that use mutual capacitance between itself and a nearby human body in order to detect a person s presence. OverviewThe human body is a great capacitor (body capacitance), and the proximity detector s capacitance… …   Wikipedia

• Gas detector — A gas detector is a device which detects the presence of various gases within an area, usually as part of a system to warn about gases which might be harmful to humans or animals. Gas detectors can be used to detect combustible, toxic, and oxygen …   Wikipedia

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