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Coupled transmission line sensor cable and method

  • US 5,448,222 A
  • Filed: 12/09/1993
  • Issued: 09/05/1995
  • Est. Priority Date: 12/09/1993
  • Status: Expired due to Term
First Claim
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1. A transducer cable comprising in combination:

  • (a) a first conductor;

    (b) a second conductor;

    (c) solid non-magnetic dielectric material between the first conductor and the second conductor generally parallel to the first conductor,(d) a longitudinal passage generally parallel to the first and second conductors extending through the non-magnetic dielectric material; and

    (e) a sense wire extending through the passage and having a cross section substantially smaller than that of said passage so that the sense wire fits loosely in said passage, so that physical movement of the transducer cable results in free movement of the sense wire relative to one of the first and second conductors, resulting in corresponding changes in the characteristic impedance of a first transmission line formed by the sense wire and the one of the first and second conductors.

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