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The BPI®
Spectrometer™ covers wavelengths from 350nm to 710nm with a resolution of
better than 10nm.
The transmittance spectrum
results may be used for quality control purposes, such as comparing tinted
lenses as well as providing information about what tints need to be added
to match the color of another lens or a customer-supplied sample spectrum.
The unit is a free-standing spectrometer with light sources that can also
be attached to a PC via the computer's RS232 port. The supplied software
requires Microsoft™ Windows™. The test results can be saved to an
integrated database and also can be printed out to any compatible printer.
The BPI® Spectrometer™ provides information on the visible
transmittance (Tv) as well as the UVA transmittance of the material being
tested along with the numerical color characteristics. (L*, a*, and b*).
This provides a means for numerical color description. L*, a* and b* are
the familiar CIELAB coordinates. L* is brightness (or lightness) ranging
from 0 (black) to 100 (white). The a* value goes from about -80 (green) to
+100 (red), while the b* value goes from about -80 (blue) to +100
(yellow). The PC software displays a transmission curve and allows one
curve to be overlaid upon another.
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