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The magnetic detector or Marconi magnetic detector, sometimes called the "Maggie", was an early radio wave detector used in some of the first radio receivers to receive Morse code messages during the wireless telegraphy era around the turn of the 20th century.
A MEMS magnetic field sensor is a small-scale microelectromechanical systems (MEMS) device for detecting and measuring magnetic fields (magnetometer). Many of these operate by detecting effects of the Lorentz force : a change in voltage or resonant frequency may be measured electronically, or a mechanical displacement may be measured optically.
The poles are dark, and pole edges are bright. Magnetic field viewing film is used to show stationary or (less often) slowly changing magnetic fields ; it shows their location and direction. It is a translucent thin flexible sheet, coated with micro-capsules containing nickel flakes suspended in oil. [ 1 ]
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A coherer detector, useful only for Morse code signals. In radio, a detector is a device or circuit that extracts information from a modulated radio frequency current or voltage. The term dates from the first three decades of radio (1888–1918).
A magnetic chip detector is an electronic instrument that attracts ferromagnetic particles (mostly iron chips). It is mainly used in aircraft engine oil and helicopter gearbox chip detection systems. Chip detectors can provide an early warning of an impending engine failure and thus greatly reduce the cost of an engine overhaul.
This includes lopping off the roof at the B-pillars, the installation of a central swivel seat to maximize viewing opportunities, and another pair of additional seats for guests of the pope.
Magnetic Anomaly Detector (MAD) P-2 Neptune, P-5 Marlin, S-2 Tracker: AN/ASQ-81: Magnetic Anomaly Detector (MAD) Light Airborne Multi-Purpose System (LAMPS) equipped helicopters, P-3 Orion, S-3 Viking: AN/ASQ-119: Stellar navigation Astrotracker astrocompass: FB-111A Aardvark: Litton Industries: AN/ASQ-153: Pave Spike electro-optical laser ...