Patent ID: 6064201
Filing Date: 2000-05-16
Classification: G01Q,G01R,Y10S

Abstract:
A method for mapping metallic patches embedded in a non-metal surface, comprising:providing a horizontal cantilever having upper and lower surfaces and a free end;attaching an electrical coil, having a center, to the lower surface at said free end;attaching a tip, that includes ferromagnetic material, at the center of the coil, said tip projecting downwards from said lower surface;directing a beam of light at said upper surface whereby said beam is reflected and enters a photodetector having an output;while passing alternating current through said coil, simultaneously moving the cantilever, the light beam, and the photodetector whereby the entire surface, including said embedded metallic patches, is scanned; andplotting the output of the photodetector as a function of the position of the tip over the non-metal surface, said output peaking in value whenever the tip passes over one of said metallic patches.