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ELECTRO MAGNETIC LOGS

          This type of log consist of
          1. Master Indicator

          2. Preamplifier

          3. Sensor
          Operations

          The sensing of speed makes use of law of electromagnetic induction.

          When  the  ship  moves,  the  water  passing  through  the  hull  acts  as  a
          conductor.

          The magnetic field is produced by a solenoid, installed in such a way as
          to allow the field to extend into water.

          This produces an EMF (electromagnetic force), which is measured and
          converted into the speed of vessel through the water.





















          Principle





















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