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2. Magnetic cartridge - Wikipedia

   en.wikipedia.org/wiki/Magnetic_cartridge

   An Audio Technica AT-F3 moving coil phono cartridge. A magnetic cartridge, more commonly called a phonograph cartridge or phono cartridge or (colloquially) a pickup, is an electromechanical transducer that is used to play phonograph records on a turntable.

3. Dynamic positioning - Wikipedia

   en.wikipedia.org/wiki/Dynamic_positioning

   This system consists of one or more transponders placed on the seabed and a transducer placed in the ship's hull. The transducer sends an acoustic signal (by means of piezoelectric elements) to the transponder, which is triggered to reply. As the velocity of sound through water is known (preferably a soundprofile is taken regularly), the ...

4. Sonar - Wikipedia

   en.wikipedia.org/wiki/Sonar

   Some civilian sonars (which are not designed for stealth) approach active military sonars in capability, with three-dimensional displays of the area near the boat. When active sonar is used to measure the distance from the transducer to the bottom, it is known as echo sounding. Similar methods may be used looking upward for wave measurement.

5. Electromagnetic acoustic transducer - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_acoustic...

   An electromagnetic acoustic transducer (EMAT) is a transducer for non-contact acoustic wave generation and reception in conducting materials. Its effect is based on electromagnetic mechanisms, which do not need direct coupling with the surface of the material.

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. Linear variable differential transformer - Wikipedia

   en.wikipedia.org/wiki/Linear_variable...

   Cutaway view of an LVDT. Current is driven through the primary coil at A, causing an induction current to be generated through the secondary coils at B.. The linear variable differential transformer (LVDT) – also called linear variable displacement transformer, [1] linear variable displacement transducer, [2] or simply differential transformer [3] – is a type of electrical transformer [4 ...