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U.S. Army soldiers use a military standard metal detector. A metal detector is an instrument that detects the nearby presence of metal.Metal detectors are useful for finding metal objects on the surface, underground, and under water.
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electrolytic detector , magnetic detector and the crystal detector , were used during the wireless telegraphy era until superseded by vacuum tube technology.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.
The gaseous detection device (GDD) is a method and apparatus for the detection of signals in the gaseous environment of an environmental scanning electron microscope (ESEM) and all scanned beam type of instruments that allow a minimum gas pressure for the detector to operate.
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.
A radar detector detector (RDD) is a device used by police or law enforcement in areas where radar detectors are declared illegal.. Radar detectors are built around a superheterodyne receiver, which has a local oscillator that radiates slightly.
In the pre-war period, the Department of Artillery of Poland's Ministry of National Defence ordered the construction of a device that could be helpful in locating duds on artillery training grounds. The instrument was designed by the AVA Wytwórnia Radiotechniczna , but its implementation was prevented by the German invasion of Poland .
Fish bone pierced in the upper esophagus. Right image without contrast medium, left image during swallowing with contrast medium. To obtain an image with any type of image detector the part of the patient to be X-rayed is placed between the X-ray source and the image receptor to produce a shadow of the internal structure of that particular part of the body.
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