Analysis of solid samples
Absolute reflectance attachment
76 Edition 09/2014 SPECORD S600 accessories
V-shaped beam path for reference measurement
The reflection takes place at the mirror, rotating mirror
and second mirror.
W-shaped beam path for sample measurement
The pivotable mirror is rotated by 180°. The sample is at the
pivoting point where the beams are reflected twice. The
other reflections (mirror/rotating mirror/mirror) are identical
to the reference measurement.
1 Pivoting point of the pivotable mirror
2 Sample
Fig.18-2 V- and W-shaped beam paths at the attachment
The reflectance R
is calculated from the quotient of reflectance (sample
measurement) / reflectance (reference measurement).
sample
– sample measurement in W position
r
reference
- reference measurement in V position
=
RS
– intensity after reflection at the reference mirror
I
reference beam
– intensity in the reference beam path
=
PS1
– intensity after the first reflection at the sample
I
PS2
– intensity after the second reflection at the sample
The result of the measurement is:
=
If the sample is sufficiently homogeneous, I
PS1
=
I
PS2
applies
.
This results in the
absolute reflectance of the sample R
abs
:
=
The value R
abs
is displayed in the graphical display or the measurement table in
percentage values.
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