The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 19, 2013
Filed:
May. 22, 2009
Stephen J. Miska, Tulsa, OK (US);
William J. Rankin, Sapulpa, OK (US);
Matthew W. Logan, Broken Arrow, OK (US);
Mark G. Register, Broken Arrow, OK (US);
Eric N. Freeman, Kiefer, OK (US);
Philip M. Maltby, Tulsa, OK (US);
Lloyd N. Salsman, Stillwater, OK (US);
Stephen J. Miska, Tulsa, OK (US);
William J. Rankin, Sapulpa, OK (US);
Matthew W. Logan, Broken Arrow, OK (US);
Mark G. Register, Broken Arrow, OK (US);
Eric N. Freeman, Kiefer, OK (US);
Philip M. Maltby, Tulsa, OK (US);
Lloyd N. Salsman, Stillwater, OK (US);
TDW Delaware Inc., Wilmington, DE (US);
Abstract
A pipeline pig signal made according to this invention houses one or more shielded magnetometer sensors and a microcontroller with adaptive thresholding detection means for reducing the likelihood of false alarms. The adaptive thresholding detection means removes outlier data from the magnetic flux data stream and then passes the outlier-free data stream through four low pass filters. A smoothed magnitude of the data stream is compared to detection limits and, if a passage event has occurred, a recent detection is indicated, a counter of a display unit is incremented, a time of passage is recorded, and both statistics are displayed on the display unit. Because a single object may produce multiple magnetic fields, the detector may be locked-out for a predetermined period of time after the passage event to prevent a second detection of the same object as it passes the detection device.