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Title: Nonferromagnetic linear variable differential transformer

A nonferromagnetic linear variable differential transformer for accurately measuring mechanical displacements in the presence of high magnetic fields is provided. The device utilizes a movable primary coil inside a fixed secondary coil that consists of two series-opposed windings. Operation is such that the secondary output voltage is maintained in phase (depending on polarity) with the primary voltage. The transducer is well-suited to long cable runs and is useful for measuring small displacements in the presence of high or alternating magnetic fields.
 [1];  [2]
  1. (Powell, TN)
  2. (Oak Ridge, TN)
Issue Date:
OSTI Identifier:
United States of America as represented by United States Energy (Washington, DC) ORNL
Patent Number(s):
US 4030085
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
Country of Publication:
United States
nonferromagnetic; linear; variable; differential; transformer; accurately; measuring; mechanical; displacements; presence; magnetic; fields; provided; device; utilizes; movable; primary; coil; inside; fixed; secondary; consists; series-opposed; windings; operation; output; voltage; maintained; phase; depending; polarity; transducer; well-suited; cable; runs; useful; alternating; output voltage; device utilizes; magnetic field; magnetic fields; alternating magnetic; differential transformer; accurately measuring; variable differential; linear variable; secondary coil; mechanical displacement; nonferromagnetic linear; /340/376/