Resources Contact Us Home
Optical glass sorting machine and method

Image Number 3 for United States Patent #6144004.

A glass sorting machine optically sorts glass cullet according to different color characteristics by irradiating the cullet with red, green and blue light as the cullet are passed through a sensing region between a light source and light sensors responsive to the different light colors. The attenuation levels of the different light colors are measured by the sensors as the cullet passes through the sensing region. The machine analyzes the attenuation levels to determine the color characteristics of the cullet. A collimator is typically used to enhance shadow definition. In one embodiment, a pixel grid map is made of the sensing region and each cullet that passes through the sensing region. Mapped on to each grid is a red, green, and blue digital signal. Attenuated signals are compared against baseline values to determine the attenuation for given cullet. The pixel grid map may be used with a data erosion technique to compensate for refraction. To reduce errors associated with optical impurities, the machine normalizes the baseline values when cullet are not in the sensing region by taking the derivative of the sensed signal and normalizing the baseline signal when no cullet are present.Another embodiment of the invention further employs infrared wavelength light to better sort ceramics as well as visibly transparent glass that is infrared opaque.

  Recently Added Patents
Methods for increasing efficacy of FOLR1 cancer therapy
Visual processing apparatus and visual processing method
System and method for transferring data in storage controllers
Computerized information and display methods
Powder pulverising device
Formwork release composition and use thereof
  Randomly Featured Patents
Process for the preparation of 4-hydroxy-3-methoxy-phenylacetonitrile
Three-way ball valve
Disc reader
Driving tool with dual-position handle and locking means therefor
Multiple punch and die assembly
Strut straightening device
Methods and systems for providing halftone screens
Defect-free dielectric coatings and preparation thereof using polymeric nitrogenous porogens
Process for controlling the operation of a refrigerating unit
Mounting of a planetary gear assembly on a casing