2 System Description
301-7146 English Rev B 11/02/2011 Operator’s Manual NA 26
At the reading positions, a CMOS camera captures images of all twelve
(12) pads of each chemistry strip successively illuminated with a red,
green and blue light. The test strips are illuminated at each reading
position with a sequence of three different LED wavelengths for less than
one (1) second. The nominal LED wavelengths are 472 nm, 525 nm, and
630 nm +/- 2 nm.
Illumination fluctuations are adjusted automatically by using an internal
reflectance standard imaged simultaneously with the strip pads. The
internal reflectance standards are positioned between and parallel to
each chemistry strip. The figure below shows the field of view with eight
(8) test strips in reading positions 1-8 and the internal standards (grey
between each strip).
The system software analyzes the captured images and quantifies the
reflectance from each pad relative to the reflectance from a neighboring
area of the Munsell standard mask plate, with a known reflectance value.
Specific Gravity, Color, and Clarity Module
See Specific Gravity.
See Color and Clarity.
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