METHOD AND APPARTUS FOR IDENTIFYING PHOTOCATALYTIC COATINGS
First Claim
1. A method of determining whether a photocatalytic coating is present on the surface of a substrate, the method comprising:
- providing a source of light energy, at least a portion of the light energy having a wavelength below about 350 nanometers (nm);
directing light energy from the source toward the surface of the substrate;
detecting light energy reflected from the surface of the substrate;
measuring an intensity level of the reflected light energy at wavelengths below about 350 nm; and
determining whether a photocatalytic coating is present on the surface of the substrate based on the measured intensity level of reflected light energy at wavelengths below about 350 nm.
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Accused Products
Abstract
A method of and apparatus for identifying the presence of thin photocatalytic (PCAT) coatings on glass surfaces. An apparatus is disclosed that can determine whether a PCAT coating (which may comprise titanium dioxide, for example) having a thickness of less than about 100 Å is present on the surface of a substrate such as glass. The apparatus may measure the reflectance of electromagnetic energy (such as light energy) at the surface of a substrate using energy at selected wavelengths or wavelength ranges. The apparatus may determine reflectance values for PCAT coated surfaces of any thickness, as well as for uncoated surfaces.
56 Citations
23 Claims
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1. A method of determining whether a photocatalytic coating is present on the surface of a substrate, the method comprising:
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providing a source of light energy, at least a portion of the light energy having a wavelength below about 350 nanometers (nm);
directing light energy from the source toward the surface of the substrate;
detecting light energy reflected from the surface of the substrate;
measuring an intensity level of the reflected light energy at wavelengths below about 350 nm; and
determining whether a photocatalytic coating is present on the surface of the substrate based on the measured intensity level of reflected light energy at wavelengths below about 350 nm. - View Dependent Claims (2, 3)
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4. A device for determining whether a photocatalytic coating is present on a surface of a substrate comprising:
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a source of light energy having wavelengths below about 350 nanometers (nm);
means for directing the light energy from the source toward a surface of the substrate;
detector means for detecting light energy reflected from the surface of the substrate;
measuring means for measuring an intensity level of light energy reflected from the surface of the substrate; and
processing means for determining whether a photocatalytic coating is present on the surface of the substrate based on the measured intensity level of reflected light energy. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of determining whether a photocatalytic coating is present on the surface of a substrate, the method comprising:
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providing a source of light energy;
directing electromagnetic energy from the source toward the surface of the substrate;
detecting electromagnetic energy reflected from the surface of the substrate;
measuring an intensity level of the reflected electromagnetic energy; and
determining whether a photocatalytic coating is present on the surface of the substrate based on the measured intensity level of the reflected electromagnetic energy, wherein the photocatalytic coating has a thickness of less than about 200 angstroms. - View Dependent Claims (20, 21)
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22. A method of measuring the thickness of a photocatalytic coating on a surface of a glass substrate, the method comprising:
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providing a source of light energy, at least a portion of the light energy having a wavelength below about 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 about 350 nm; and
determining the thickness of a photocatalytic coating on the surface of the glass substrate based on the measured intensity level of reflected light energy at wavelengths below about 350 nm.
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23. An apparatus for measuring the thickness of a photocatalytic coating on a glass substrate comprising:
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a source of light energy having wavelengths below about 350 nanometers (nm);
means for directing the light energy from the source toward a surface of the substrate;
detector means for detecting light energy reflected from the surface of the substrate;
measuring means for measuring an intensity level of light energy reflected from the surface of the substrate; and
processing means for determining the thickness of a photocatalytic coating on the surface of the glass substrate based on the measured intensity level of reflected light energy at wavelengths below about 350 nm.
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Specification