Patent ID: 6512385
Filing Date: 2003-01-28
Classification: G01R,G03H

Abstract:
A method of testing a device under test comprising:(a) providing a beam of light from a light source having a first wavelength; (b) imposing said beam of light on a test device over a spatial region within said test device substantially greater than said first wavelength, wherein said test device has a first state of birefringence; (c) imposing said beam of light on said test device over a spatial region within said test device substantially greater than said first wavelength, wherein said test device has a second state of birefringence; and (d) obtaining data resulting from the interference of said first beam and said second beam within said device under test representative of the voltages within said region; (e) wherein said first state of birefringence is at a first voltage potential, and wherein said second state of birefringence is at a second voltage potential different from said first voltage potential.