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Systems and methods for measuring birefringence in glass and glass-ceramics

  • US 8,957,374 B2
  • Filed: 09/23/2013
  • Issued: 02/17/2015
  • Est. Priority Date: 09/28/2012
  • Status: Active Grant
First Claim
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1. A method of optically measuring an amount of birefringence B in a surface of a sample, comprising:

  • a) digitally capturing TE and TM angular spectra of intensity versus pixel number for the sample, wherein the digital capturing is defined by pixels having an index resolution;

    b) processing the TE and TM angular spectra to minimize differences between respective regions of the TE and TM angular spectra, wherein the respective regions include a rate of change of intensity with angle that is at least 40% of a maximum rate of change of intensity with angle;

    c) determining an amount of shift in pixels that best overlaps the processed TE and TM spectra; and

    d) determining the amount of birefringence B by multiplying the pixel shift by the index resolution.

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