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Eddy current probe with differential magnetic field sensors

Rosado, L. S. ; Cardoso, F. A. C.

Instituto de Telecomunicações, Instituto de Engenharia de Sistemas e Computadores - Investigação e Desenvolvimento, Instituto de Engenharia de Sistemas e Computadores - Microsistemas e Nanotecnologias

Invention Title: Eddy current probe with differential magnetic field sensors

Patent Nr.: PCT/IB2015/050964

Type: Patent

Regional Coverage: PCT

Priority Date: 07-02-2014

Filing Date: 09-02-2015

Country: Portugal

Abstract
An eddy current probe using magnetic field sensors in the resulting magnetic field readout is provided. At least two sensors are configured to measure the same magnetic field component but at different locations separated by an arbitrary distance. These sensors are 5 simultaneously electrically biased at to the same current level leading to similar voltage across each sensor. A differential amplifier is configured to amplify the difference between the voltages across the two sensors.