Detector

Details Detector Detector

2006-12-20

2009-11-24

Whittington, Kenneth J (Department: 2858)

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

C324S220000

Reexamination Certificate

active

07622916

ABSTRACT:
A casing position locator for detecting structural features of a borehole casing, the locator including: a plurality of field generators for generating respective dynamic magnetic fields which combine to provide a dynamic test magnetic field to interact with the casing, where the test field includes a magnetic field null point located where the respective dynamic magnetic fields substantially cancel each other out; and a sensor for detecting a change in the position of the null point, relative to the sensor, due to the interaction.

REFERENCES:
patent: 5119023 (1992-06-01), Lloyd
patent: 6437573 (2002-08-01), Golder et al.
patent: 6768299 (2004-07-01), Almaguer
patent: 2003/0117134 (2003-06-01), Almaguer
patent: 0 697 497 (1996-02-01), None
patent: 1 302 624 (2003-04-01), None
Wilson, John W. et al Residual magnetic field sensing for stress measurement Sensors and Actuators A, 2006, doi:10.1016/j.sna.2006.08.010.

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