Patent ID: 7206078
Filing Date: 2007-04-17
Classification: G01B,G01N,H01L

Abstract:
1. A method of testing a device under test comprising: (a) providing a beam of light from a light source having a first wavelength; (b) in a first beam instance 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 refractive indexes; (c) in a second beam instance 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 refractive indexes; (d) obtaining first data resulting from the interference of said first beam instance within said device under test representative of the voltages within said region and obtaining second data resulting from the interference of said second beam instance within said device under test representative of the voltages within said region, and comparing said first and second data to determine operating characteristics within said device under test; (e) displaying at least one of said operating characteristics; and (f) wherein said first state of refractive indexes is at a first voltage potential, and wherein said second state of refractive indexes is at a second voltage potential different from said first voltage potential.