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Method of identifying a buried cable by applying a low frequency signal to the cable and detecting the resultant field

  • US 6,127,827 A
  • Filed: 01/16/1997
  • Issued: 10/03/2000
  • Est. Priority Date: 07/22/1994
  • Status: Expired due to Term
First Claim
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1. A method of identifying a cable buried underground comprising the steps of:

  • (a) electrically isolating the cable;

    (b) applying a voltage signal to the cable, the voltage signal having non-zero frequency less than 10 Hz;

    (c) bringing an electric field sensor into proximity with the cable; and

    (d) detecting the electric field due to the voltage signal using said sensor.

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