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Method and apparatus for identifying photocatalytic coatings

  • US 7,679,063 B2
  • Filed: 11/07/2006
  • Issued: 03/16/2010
  • Est. Priority Date: 11/07/2005
  • Status: Active Grant
First Claim
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1. A method of determining whether a photocatalytic coating is present on the surface of a glass substrate, the method comprising:

  • providing a source of light energy, at least a portion of the light energy having a wavelength below 350 nanometers (nm);

    directing light energy from the source toward the surface of the glass substrate;

    detecting light energy reflected from the surface of the glass substrate;

    measuring an intensity level of the reflected light energy at wavelengths below 350 nm; and

    determining whether a photocatalytic coating having a thickness of less than 200 angstroms is present on the surface of the glass substrate based on the measured intensity level of reflected light energy at wavelengths below 350 nm.

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