Patent ID: 8537342
Filing Date: 2013-09-17
Classification: G01B,G01L

Abstract:
1. A polariscope for measuring a sample, comprising: a light source; a sample stage for retaining the sample to be measured; a camera; a first polarizer; a second polarizer; a first waveplate; and a second waveplate; wherein: said light source and said camera are positioned such that light emitting from said light source defines a light path that passes from said light source and into said camera; said sample stage is positioned such that when the sample is positioned thereon the sample is within said light path; each of said first polarizer, said second polarizer, said first waveplate, and said second waveplate are positioned within said light path intermediate said light source and said camera; said first and second polarizers are near infrared linear polarizers having a diameter of about 80 to 120 mm; and said first and second waveplates are first-order quarter waveplates with a wavelength of about 1130 to 1170 nm and a diameter of about 80 to 120 mm.