Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reexamination Certificate
2005-12-13
2005-12-13
Lefkowitz, Edward (Department: 2862)
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
C324S222000, C324S228000
Reexamination Certificate
active
06975108
ABSTRACT:
A non-contact printed circuit board (PCB) electromagnetic testing system comprises at least one high resolution transducer operative to induce multi-frequency, multi-amplitude eddy currents in a tested PCB, each such transducer including both a high frequency excitation coil that serves also as a sensing coil and a direct current (DC) bias coil operative to provide an optimal transducer operating regime; a multi-frequency generator for providing AC and DC bias signals to each transducer; and a control mechanism for driving the transducer. Optionally, the system further comprises an external ferrite concentrator that enhances a magnetic field flux focus and depth of focus on the inspected PCB. The multi-frequency, multi-amplitude methods enable three-dimensional mapping of various features in the PCB with both high sensitivity and high resolution in respective operating regimes.
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Bilik Yuli
Boroda Vladimir
Keydar Eytan
Friedman Mark M.
Lefkowitz Edward
Whittington Kenneth J.
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