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The sensing electrodes measure the potential difference (the Hall voltage) proportional to the axial component of the magnetic field that is perpendicular to both the current's axis and the sensing electrodes' axis. [5] Hall effect sensors respond to static and changing magnetic fields. Inductive sensors instead only respond to changes in fields.
Photoelectric sensor. Conceptual through-beam system to detect unauthorized access to a secure door. If the beam is interrupted, the detector triggers an alarm. A photoelectric sensor is a device used to determine the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver.
A radome (a portmanteau of radar and dome) is a structural, weatherproof enclosure that protects a radar antenna. [1] The radome is constructed of material transparent to radio waves. Radomes protect the antenna from weather and conceal antenna electronic equipment from view. They also protect nearby personnel from being accidentally struck by ...
A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. A proximity sensor often emits an electromagnetic field or a beam of electromagnetic radiation ( infrared, for instance), and looks for changes in the field or return signal. The object being sensed is often referred to as the proximity ...
A radar detectoris an electronic device used by motoriststo detect if their speed is being monitored by policeor law enforcementusing a radar gun. Most radar detectors are used so the driver can reduce the car's speed before being ticketed for speeding. In general sense, only emitting technologies, like doppler RADAR, or LIDARcan be detected.
A stingray that got pregnant at a North Carolina aquarium this winter despite not having shared a tank with a male of her species for many years has died. The Aquarium and Shark Lab in ...
The AN/APG-78 Longbow is a millimeter-wave fire-control radar (FCR) target acquisition system and the Radar Frequency Interferometer (RFI), which are housed in a dome located above the main rotor. [4] [5] The radome's raised position enables target detection while the helicopter is behind obstacles (e.g. terrain, trees or buildings). The APG-78 ...
The movie would go on to be a powerhouse, spawning the sequel "Legally Blonde 2: Red, White & Blonde" and a long-running Broadway musical, among other spinoffs.