Labsphere RSA-PE-20 User Manual

AQ-00073-000, Rev. 7 13
In some instances, you may need to load a light trap at the sample reflectance port. The light trap
can be loaded using either wedge and fits into the sample holder in the same manner as a reflec-
tance standard.
Theory of Operation
During the traditional measurement of sample absorption by a spectrometer, the relationship
between absorptance and transmittance of the sample beam is described by the Kirchoff equa-
tion:
where:
A = absorptance and
T = transmittance.
When measuring the absorptance of a sample in the sample compartment, the detector signal of
the spectrometer represents the portion of the sample beam that is not absorbed or scattered by
the sample.
When using the RSA-PE-20 accessory, it is convenient to use the Kirchoff relationship:
Sample or Standard
Clam
p
8 Wedge
Figure 8. Loading a standard or sample into the sample
holder.
AT+1
,
=

Labsphere RSA-PE-20 Specifications

General

Brand	Labsphere
Model	RSA-PE-20
Category	Laboratory Equipment
Language	English