BAS SEC2000 Spectra System, Руководство по эксплуатации

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SEC2000 Operating Manual
SEC2000 Spectra System
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34
5-5. Reflectance Measurement
Reflection is the change in direction of a wave front at an interface between two
dissimilar media so that the wave front returns into the medium from which it originated.
The reflection of light may be Specular (that is, mirror-like) or Diffuse (that is, not
retaining the image, only the energy) depending on the nature of the interface. The
glossier the surface is, the closer to specular reflection it is.
Reflection is expressed as a percentage (%r) of reflective light quantity from a standard
reference substance:
%r = {
（
S-D
）
/
（
R-D
）
}  100 (%)
Where r is the reflectance of the sample, S is the reflect light amount which means
applied light to the sample surface; R is the reflect light amount which applied light to the
standard reflective material surface; D is the amounts of dark light when light intercepts.
5-5-1. Reflectance Measurement 1
In this measurement, the shape of the sample should be board like and it can be set into
the cuvette holder at 45 degrees.
The reflectance is measured with the following procedure.
<Fig. 5-5-1> Configuration example of reflectance measurement.
①
First, the light source and detector of SEC2000 are set as shown in Fig. 5-5-1.
②
The power supply is switched on and turned ON the UV lamp and halogen lamp.