Radars: What happened next – Wetter

The first inventor who used the radio waves to detect the presence of distant metallic objects was the German inventor Christian Hülsmeyer. He proved the feasibility of detecting a ship in thick fog, but not far distance from the transmitter. The German inventor acquired an exculpation invention for his detection device in April 1904 then later related modification to calculating the distance between the device and the ship. On September 23, 1904 he got a British patent for a complete radar system, which he called it a telemobiloscope. In addition, the pulse of radar signal was created via a spark-gap and it can be operated on a 50 cm wavelength. When it was presented to German  military officials in practical tests in Cologne and Rotterdam harbor it been rejected because his system already used the classic antenna setup of horn antenna with parabolic reflector.

The radio waves are not only used for detecting things. In the beginning of the Second World War, the military had the SONAR (Sound navigation and ranging) system for some time also the British ASDIC system had installed in the ships since the early 1920s. In core, there are no difference between the radar and the sonar because they both in work the same way by a current of pulses which returned echoes and sent out where analyzed. The only difference between sonar and radar in determining the goal is the affections. The main chain set at ninety degrees to each other because it used two receiving antennas for each station. By using a device called goniometer it can compare the signal strengths and it was possible to know the direction of the echo returned. The discovery of rotation of the antennae soon afterwards but, (at first, in Chain Home Low, the antennae were rotated by someone pedaling an adapted bicycle!) in the familiar modern system.

New learned words

  • Radar:

Part of speech: Noun.

Definition: It is a device which can detect moving objectives by using radio waves.

Example: Lobbyists working under the media’s radar.

  • Exculpation:Definition: To clear from a charge of guilt or fault.
    1. Example: He is then to be heard in exculpation and to withdraw.
    2. Part of speech: Verb.
  • Telemobiloscope:Definition: A transmitter-receiver system for detecting distant metallic objects by means of electrical waves.
    1. Example:
    2. Part of speech: Noun.
  • Parabolic: Definition: Shaped like a paraboloid.
    1. Example: A parabolic mirror.
    2. Part of speech: Adjective.
  • Echoes:Definition: A person who reflects or imitates another.
    1. Example: A sound reflection in empty place.
    2. Part of speech: Noun.
  • Goniometer:Definition: An instrument for measuring solid angles, as of crystals.
    1. Example: The movable arm of the goniometer was placed over the body surface of the humerus toward the lateral epicondyle.
    2. Part of speech: Noun.
  • Rotation:Definition: The act of rotating; a turning around as on an axis.
    1. Example: When the moon is farther away, the axis rotation kind of gets behind the moon’s orbital motion.
    2. Part of speech: Noun.
  • Sonar:Definition: a method for detecting and locating objects submerged in water by echolocation.
    1. Example: It features odd-ball technology in the form of a sonar suspension.
    2. Part of speech: Noun.
  • Wavelength:Definition: the wavelength of the carrier wave used by a particular broadcasting station.
    1. Example: We seemed to be on the same wavelength from the moment we met.
    2. Part of speech: Noun.
  • Pedaling:Definition: A lever like part worked by the foot to supply power in various mechanisms, as the bicycle. 
  1. Example: The would-be cyclist can concentrate on steering and pedaling.
  2. Part of speech: Noun.

http://www.open.edu/openlearn/science-maths-technology/engineering-and-technology/radar-what-happened-next-wetter

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