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Above ground loop system proximity detection

  • US 9,514,643 B2
  • Filed: 11/24/2014
  • Issued: 12/06/2016
  • Est. Priority Date: 11/24/2014
  • Status: Active Grant
First Claim
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1. A loop detection apparatus comprising:

  • an inductive loop;

    a processing device comprising circuitry configured to connect to the inductive loop and sense from the inductive loop a change in inductance of the inductive loop; and

    wherein the inductive loop is configured to be disposed at least partially above a surface on which a vehicle travels,wherein the processing device is configured to detect a change in inductance of the inductive loop beyond a first threshold value,wherein in response to detecting the change in inductance of the inductive loop beyond the first threshold value, the processing device is configured to transmit a first signal configured to effect a first action,wherein the processing device is configured to detect a change in inductance of the inductive loop beyond a second threshold value, wherein in response to detecting the change in inductance of the inductive loop beyond the second threshold value, the processing device is configured to transmit a second signal to effect a second action different from the first action.

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