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Magnetic field detector

  • US 5,694,952 A
  • Filed: 12/20/1996
  • Issued: 12/09/1997
  • Est. Priority Date: 12/15/1994
  • Status: Expired due to Fees
First Claim
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1. A magnetic field detector comprising:

  • a source of voltage;

    a coil containing a core and connected to said source of voltage;

    means connected to said coil and to said source of voltage for charging said coil with voltage from said source of voltage for a defined period of time and for subsequently discharging said coil, said coil having a discharge time associated therewith; and

    magnetic field indicator means for measuring said discharge time of said coil and for generating a detection signal indicating a presence of a magnetic field in which said coil is disposed if said discharge time is less than a defined time threshold value.

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