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Linear distance measuring device using a moveable magnet interacting with a sonic waveguide

  • US 3,898,555 A
  • Filed: 12/19/1973
  • Issued: 08/05/1975
  • Est. Priority Date: 12/19/1973
  • Status: Expired due to Term
First Claim
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1. A linear distance measuring device comprising, sonic waveguide means formed of a tubular member of magnetostrictive material, electrical conducting means located within said waveguide means, said conducting means having an outside diameter less than the inside diameter of said waveguide means and being in unattached relationship with said waveguide means, pulse generating means for applying electrical pulses to said electrical conducting means, magnet means movable along said waveguide means, mode converter means located in a fixed position along said waveguide means for generating an electrical signal in response to the reception of a sonic torsion pulse launched by said magnet means when an electrical pulse is applied to said electrical conducting means, circuit responsive means for measuring the time interval between the application of an electrical pulse to said electrical conducting means and the reception of a sonic pulse by said signal generating means, and means responsive to said circuit means for indicating the position of said movable magnet means relative to said electrical signal generating means.

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