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System and method for detecting the passage of an object in pipeline including shielded magnetometer and a microcontroller with adaptive thresholding detection means

  • US 8,378,667 B2
  • Filed: 05/22/2009
  • Issued: 02/19/2013
  • Est. Priority Date: 05/22/2009
  • Status: Active Grant
First Claim
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1. A system for detecting the passage of an object in a pipeline, the system comprising:

  • a detector configured for arrangement about and secured to an external surface of the pipeline and including at least one magnetometer sensor;

    a shielding surrounding the at least one magnetometer sensor; and

    a microcontroller in communication with the at least one magnetometer sensor and having an adaptive thresholding detection means for processing a magnetic flux data stream collected by the at least one magnetometer sensor and detecting a passage event;

    the adaptive thresholding detection means calculating a baseline estimate and a noise estimate and using the baseline and noise estimates to determine an upper threshold and a lower threshold, the upper threshold being used to detect movement and the lower threshold being used to reset the detector.

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