Patent ID: 6727687
Filing Date: 2004-04-27
Classification: G01B,G01D,G01N

Abstract:
A method for measuring a gap between a proximity probe and a conductive target material, said method including the steps of:providing a network of components including a first electrical component and a proximity probe component serially connected; driving a dynamic current through the serially connected electrical components for impressing a first analog voltage across the network and a second analog voltage cross the proximity probe component; sampling and digitizing the first analog voltage impressed across said serially connected resistance and probe components to obtain a first digitized voltage value; sampling and digitizing a second analog voltage impressed across the probe component to obtain a second digitized voltage value; digitally convolving said first digitized voltage and said second digitized voltage into a first complex number and a second complex number respectively; calculating a voltage ratio of said second complex number to a difference between said first complex number and said second complex number; processing said voltage ratio into a gap value correlative to a gap between said proximity probe and a conductive target material.