Patent ID: 6285207
Filing Date: 2001-09-04
Classification: G01N,G02F,G09G

Abstract:
A method of testing an electrically conductive substrate, the method comprising the steps of:contacting a first portion of a surface of a sensing material to a first portion of a surface of the substrate to form a first contiguous area of intimate mutual contact area between the first portion of the surface of the sensing material and the first portion of the surface of the substrate and contacting a second additional portion of the surface of the sensing material to a second additional portion of the surface, thereby expanding the contiguous contact area to form a larger contiguous area of intimate mutual contact between the surface of the sensing material and the surface of the substrate,applying a test signal to electrodes on the substrate and the sensing material;illuminating the sensing material; anddetecting light that has interacted with the sensing material to determine any changes induced in the sensing material as a result of defects in the substrate which show up upon the application of the test signal to the electrodes.