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  • Kendisi herhangi bir enerji göndermeden su altındaki cisimlerin yaydıkları titreşimleri algılayıp elektrik işaretlerine dönüştüren ve ekranda yansıtan gözlem aygıtı. (tr)
  • passive sonar is essentially listening for the sound made by vessels. Passive sonar listens without transmitting. It is often employed in military settings, although it is also used in science applications, e.g., detecting fish for presence/absence studies in various aquatic environments. (en)

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