Acoustic Mirrors for Aircraft Detection

Discussion in 'WW2 General' started by Matt308, Oct 11, 2010.

  1. Matt308

    Matt308 Glock Perfection
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    Acoustic ears and mirrors used for detection of airborne invasion were spawned from the idea of stereoscopic sound locating devices to provide location/distance information to defensive forces. These family of devices were used to detect anything from artillery rounds in WWI to aircraft in WWII. Modern day versions are now used to detect acoustic signatures for determination of sniper locations. Some interesting pics and wiki link to the listening ears used to protect England in WWII.

    Acoustic mirror - Wikipedia, the free encyclopedia

    Acoustic Radar.
     

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  2. Matt308

    Matt308 Glock Perfection
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    I found this interesting...
    ________________________________________________________

    "Britain never publicly admitted it was using radar until well into the war, and instead publicity was given to acoustic location, as in the USA. It has been suggested that the Germans remained wary of the possibility of acoustic location. and this is why the engines of their heavy bombers were run unsynchronised, instead of synchronised as was the usual practice, in the hope that this would make detection more difficult. "
     
  3. RabidAlien

    RabidAlien Active Member

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    Actually, it is! Thanks for posting that, Matt! :thumbleft:
     
  4. BombTaxi

    BombTaxi Active Member

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    I think the third pic down is somewhere in the UK (big concrete reflectors), and I know I've seen an excellent article of a recent site visit somewhere on t'internet, with a good explanation of the building process and the rationale of creating those massive concrete structures, which I will post when I find it. Matt, do you know the location of that shot?
     
  5. fastmongrel

    fastmongrel Well-Known Member

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    #5 fastmongrel, Oct 12, 2010
    Last edited: Oct 12, 2010
    The sound mirrors in the 3rd pic are the ones at Denge in Kent near Dungeness. Well worth a visit if your in the area but you need to book in advance, the largest one is huge and must have been a formidable engineering task in the 1930s. Heres a useful link
    Denge sound mirrors Sound mirrors
     
  6. Matt308

    Matt308 Glock Perfection
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    Mongrel is right. I have also been told that there was a UK documentary on this site. Anyone know where we might download that?
     
  7. fastmongrel

    fastmongrel Well-Known Member

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  8. RabidAlien

    RabidAlien Active Member

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    That second photo, is that WW1 era?
     
  9. vikingBerserker

    vikingBerserker Well-Known Member

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    Very intersting!
     
  10. tail end charlie

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    I suppose what did for these systems was the simple laws of physics. Even if they had worked perfectly you only find out where the bomber was several minutes ago.
     
  11. CharlesBronson

    CharlesBronson Well-Known Member

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    Exactly, the speed of sound ( in good weather) is 321 meter per second....compared with the 299,998 km/ per second of the radar waves... no contest. 8)
     
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