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So the radio receiving equipment of the time did not have to convert the radio waves into sound like modern receivers, but merely detect the presence or absence of the radio signal. The device that did this was called a detector. The first widely used detector was the coherer, invented in 1890. The coherer was a very poor detector, insensitive ...
It was a 4-coil induction balance for detecting submerged metallic torpedoes and iron ships and the like. [8] Given the development time involved this may have been the earliest known device specifically constructed as a metal detector using magnetic induction.
Non-linear Junction Detector (NLJD): A portable NLJD allows the operator to search voids and areas where they are unable to gain physical or visual access, in order to detect electronic components and determine if the area is free from IEDs. Laser IED Detection: Scientists are learning to adapt lasers to detect, or defeat, IEDs. [19]
The device that performed this function in the receiver circuit was called a detector. [1] A variety of different detector devices, such as the coherer , electrolytic detector , magnetic detector and the crystal detector , were used during the wireless telegraphy era until superseded by vacuum tube technology.
This is a list of historically significant items found by metal detecting method, only excluding magnet fishing finds, since magnet fishing is usually considered a distinctively different and separate hobby from traditional metal detecting.
Another source estimates that a 100 m long and 10 m wide submarine would produce a magnetic flux of 13.33 nT at 500 m, 1.65 nT at 1 km and 0.01 nT at 5 km. [6] To reduce interference from electrical equipment or metal in the fuselage of the aircraft, the MAD sensor is placed at the end of a boom or on a towed aerodynamic device. [7]
In general, detection is the action of accessing information without specific cooperation from with the sender. In the history of radio communications, the term "detector" was first used for a device that detected the simple presence or absence of a radio signal, since all communications were in Morse code.
The name of the detector is a pun [3] which was bestowed upon it by Fred Reines, one of the scientists working on the project.The name is derived from the Hindi word "bhang", a locally grown variety of cannabis which is smoked or drunk to induce intoxicating effects, the joke being that one would have to be on drugs to believe the bhangmeter detectors would work properly.
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