The ASDIC system has its limitations: it is affected by the turbulence created by propellers or by the motion of ships it becomes inefficient, therefore, once the submarine has succeeded in slipping inside the convoy. In 1940, ASDIC detection could locate a submarine, a whale or a school of fish at a distance of 2,000 metres. The transmitter is located in a dome under the hull and the signal is sent forward. The operator will immediately notify the bridge of any suspicious reading.ĪSDIC sound impulses use a frequency between 14 and 22 kilocycles the operator of each ship in a convoy must select a frequency different from that used by the neighbouring vessels otherwise he could intercept the original signal from another ASDIC, resulting in a very loud “ping”. Position is estimated based on the direction of the echo, and distance based on the delay between emission and interception. The return sound wave also sets in motion a stylus that records the echo on a chart. The sound waves travel through water and, when they hit a solid body, bounce back as an echo, which is intercepted, amplified and then heard by the operator. The ASDIC emits a sound signal at regular time intervals. The ASDIC is a sonar system for submarine detection developed by British, French and American scientists during WWI the name is derived from that of the Anti-Submarine Detection Investigation Committee.
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