Методические указания на английском языке для студентов старших курсов технологического факультета и аспирантов. Лебедев Л.А. - 10 стр.

         An automatic pressure plate places a consistent amount of pressure
                 on the sample when it is presented to the window

       Uniform pressure applied to the sample blocks out room light and eliminates air
pockets and folds. Once the camera observes the sample, the dedicated microprocessor
digitizes the signal and calculates and displays the results. The results include the percent
of the inspected area occupied by trash, the actual number of particles observed and the
trash code number of the sample. The code number is determined by the calibration
parameters selected and the standards used. For example, if United States Department of
Agriculture (USDA) standard samples are used in calibration, then the code number
displayed will correspond to the USDA standard. In addition to the numerical results, a
digital image of the trash sample may be observed on a dedicated monitor.This helps the
user to ensure proper positioning of the sample and to detect air pockets.

         The total test time is one to three seconds, depending on the amount
                 of trash, with repeatable and accurate tests results.

      When compared to the time-consuming tests of the mechanical separator and the
limited attention span and judgment drift of the classer’s eye, Trashmeter tests are simple,
quick and reliable.

                                       Colorimeter

       For over two hundred years color has been considered an important property in
cotton evaluation because it influences the value and price of fiber. The Colorimeter
provides fast, accurate and objective measurements of cotton color to mills for purchasing
raw cotton and for monitoring incoming shipments. The Colorimeter 930 is the latest in a
line of Spinlab colorimeters that have been used extensively by the USDA for preparation
of grade standards that are subsequently distributed to merchants, shippers and mills all
over the world.
       During a test, a sample is comressed by an automatic pressure plate to eliminate air
pockets and folds in the sample and to block out room light.

                Two incandescent lamps positioned at 45° angles to the
              sample window illuminate the sample during measurement.

      The resulting light is then filtered and detected by photodiodes and resolved into the
sample’s two color components - lightness and yellowness. The values are digitized;
lightness is expressed as percent reflectance ( % Rd), while yellowness is expressed in
Hunter’s scale values (+b). These values are instantaneously converted into the equivalent
USDA color grade values, which correspond to the USDA Color Meter Block Diagram,
the universal standard for grading American Upland or Pima cottons.