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SpectraWiz Applications Menu
///////////////////// Applications /////////////////////////////
CIE Color Monitor............for SpectroColorimeter
ChemWiz Methods..............for chemical concentrations
Ultra Violet Monitor.........for UVabc measurements
Irradiance Calibration.......for SpectroRadiometer
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CIE Color Monitor
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This SpectroColorimeter application provides a precise way to
perform color measurement using the basic principles and
techniques defined by the International Commission on
Illumination (CIE).
If SpectraWiz is placed in the View ->
Irradiance modes (for watts or lumens), then the color of
light is displayed using the xy chromaticity diagram and
related dominant wavelength. If SpectraWiz is placed in
the View -> transmission mode, the the color of light is
displayed using CIELAB circular graph for a* and b*. The
L* is the color lightness and is displayed in a bar graph.
This mode is used to measure color of reflected light.
The first set of values derived are known as tri-
stimulus values which are proportions of Red (700 nm),
Green (546.1 nm), and Blue (435.8 nm). From these
values a uniform color space is derived known as
the CIE 1976 (L* a* b*) color space or the CIELAB
color space. These values are pronounced Lstar,
astar, and bstar. L* is the lightness 0..100,
a* and b* are the color values from -60..+60.
CIELAB tolerancing is used to determine color
differences known as Delta E. CIELAB uses
rectangular coordinates that are based on
specific formulas using the tristimulus values.
The L* a* b* values are computed in real time and
are displayed graphically in circular color chart
that is updated several times per second, depending on
the user selected sample rate and sample averaging. If
a fiber optic reflection probe is moved across a
spectral color chart, a data cursor can be seen to
move in a circle around the CIELAB color chart.
The application allows user selection of CIE Standard
Illuminants A, B, C, D50, D55, D65, D75 in addition
to flourescent lamps F1..F12. The CIELAB data is
then compensated from a table providing the relative
spectral power distributions for the selected
illuminant.
Note: the default illuminant is d65 (daylight)
For best results, set the detector integration time to
accomodate lighting (at about 100ms) and
setup => Number of scans to avg = 4
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