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Humanitarian demining aims to clear all landmines to a certain depth and make the land secure for human use. Landmine detection techniques have been studied in various forms. Detection of mines can be done by a specially designed metal detector tuned to detect mines and bombs. Electromagnetic technologies have been used in conjunction with ...
Both were transistor-based, and their primary technical difference was indicated by the letter, S band (better suited for long range) and C band, respectively. Until the 1990s, there were 128 of the WSR-57 and WSR-74 model radars were spread across that country. The first devices to capture radar images were developed during the same period.
A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).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.
The detection process described above can also be accomplished by combining, in an exclusive-OR (XOR) logic gate, the limited original FM signal and either a copy of that signal passed through a network which imposes a phase shift that varies with frequency, e.g. an LC circuit (and then limited as well), or a fixed-frequency square wave carrier ...
The materials basis for infrared detection devices are narrow-gap semiconductors, including compounds and alloys of bismuth, antimony, indium, cadmium, selenium and others. [ 3 ] [ 4 ] Lead(II) sulfide (PbS)
A magnetic anomaly detector (MAD) is an instrument used to detect minute variations in the Earth's magnetic field. [1] The term typically refers to magnetometers used by military forces to detect submarines (a mass of ferromagnetic material creates a detectable disturbance in the magnetic field ).
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 .
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 ...