One common application is activating automatic door openers in businesses and public buildings. Motion detectors have found wide use in commercial applications. Tomographic motion detection systems can cover much larger areas because the radio waves it senses are at frequencies which penetrate most walls and obstructions, and are detected in multiple locations. Specialized systems are more expensive but have either increased sensitivity or much longer ranges. Most low-cost motion detectors can detect motion at distances of about 15 feet (4.6 m). Changes in the optical, microwave or acoustic field in the device's proximity are interpreted by the electronics based on one of several technologies. However, a passive contains only a sensor and only senses a signature from the moving object via emission or reflection. They form a vital component of security, automated lighting control, home control, energy efficiency, and other useful systems.Īn active electronic motion detector contains an optical, microwave, or acoustic sensor, as well as a transmitter. Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area. Electrical device which utilizes a sensor to detect nearby motion A motion detector attached to an outdoor, automatic light.Ī motion detector is an electrical device that utilizes a sensor to detect nearby motion.
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