"An alternative configuration would be to use a broad spectrum light source with a linear color filter placed in front of it to create a multi-wavelength light source. The linear color filter passes different wavelengths depending on the position of the filter. A second alternative would use a broad spectrum light source with discrete filters in front of it to produce the multi-wavelength light source. A third alternative configuration would be to use a broad spectrum source with multiple apertures as the light source and a color 2D image sensor. The color filter built into the 2D image sensor would serve as the sparse wavelength spectrometer. A fourth alternative would use a broad spectrum light source with a dispersive element such as a grating to generate a multi-wavelength source.
"Improved monitoring of the glass fabrication process leads to decreased scrap of defective product, decreased labor requirements to control the process, increased ability to meet established quality levels, decreased use of energy and raw material inputs due to improved yield and therefore decreased cost of production.
"Advantages offered by the present invention include: detection of coatings not visible to the human eye; rapid and accurate detection of coatings and measurement of thickness while not contacting the transparent sheet; identification of the surface upon which coatings are present; rapid identification of a defective transparent sheet or an incorrectly oriented, transparent sheet; and a decrease in labor, energy and material costs due to increased yield and decreased scrap from the process.
"All patents cited herein are hereby incorporated by reference in their entirety to the same extent as if each individual patent was specifically and individually indicated to be incorporated by reference.
"Other features and advantages of the invention will become apparent from the following detailed description, and from the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
"All Figures are illustrated for ease of explanation of the basic teachings of the present invention only; the extensions of the Figures with respect to number, position, relationship and dimensions of the sheets to form the preferred embodiment will be explained or will be within the skill of the art after the following description has been read and understood. Further, the exact dimensions and dimensional proportions to conform to specific force, weight, strength, and similar requirements will likewise be within the skill of the art after the following description has been read and understood.
"FIG. 1 of the drawings shows a functional diagram of the components in the geometry intended for the device.
"FIG. 2 of the drawings shows the reflected images of three LEDs from each of two sides of a transparent sheet as detected by the image generating device.
"FIG. 3A through G of the drawings shows the reflected images of six LEDs from the first and second surfaces of transparent sheets in the absence of any coating or with various coatings applied.
"FIG. 4 of the drawings shows representative LowE reflectance profiles.
"FIG. 5 of the drawings shows the sparse spectrometer profile obtained from the LowE reflectance profiles shown in FIG. 4.
"FIG. 6 of the drawings shows the reflected images of six LEDs from four sides of two transparent sheets comprising an insulated glass window.
"FIG. 7 of the drawings shows the reflected images of six LEDs from six sides of three transparent sheets comprising an insulated glass window."
For additional information on this patent application, see: Blair, Alan. Coating Detection on Transparent Sheet Material. U.S. Patent Application Serial Number 403988, filed
Keywords for this news article include: Patents, Electronics, Legal Issues, Photovoltaic.
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