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Fluorescence Measurement
This instrument features both a UV full xenon lamp and a UV cut xenon lamp. Fluorescence reflectance is calculated
through numerical processing of the reflectance from these two light sources.
With fluorescence calibration
To ensure accurate fluorescence reflectance measurement, fluorescence calibration can be performed using the
UV Control Software that is provided with SpectraMagic NX (Ver. 3.2 and later).
Finding the fluorescence reflectance
The fluorescence amount is determined for each reflectance wavelength under both the UV full light source and
the UV cut light source by measuring a fluorescence standard plate. The fluorescence correction coefficient is
determined to ensure the measured values are matched to the given target values.
(Calibration example: Profile mode)
The fluorescence correction coefficient is used to determine the fluorescence reflectance through numerical
processing of a measurement object's reflectance under the UV full light source and under the UV cut light source.
(The reflectance of the cut wavelength region for UV cut lighting is uniform at 0%.)
This allows the instrument to approximate the output fluorescence amount under any reference light source, such
as a D65 light source, without increasing or decreasing the amount of UV light as with conventional models.
Without fluorescence calibration
The spectral distribution characteristics of the instrument's UV full xenon lamp are close to that of a D65 light
source, making it possible to measure fluorescence reflectance with ordinary reflectance measurement if strict
accuracy is not required for the fluorescence measurement.
UV cut light source
This instrument can be equipped with a UV400 or UV420 option as a UV cut light source.
Under UV full light source
Under UV full
light source
Under D65 light source
Under D65
(input target value)
light source
Under UV cut light source
37
b a
Under UV cut light source
Correction coe cient = b/a
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