White Reference - ASD FieldSpec 3 User Manual

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Figure 7-5
7.11

White Reference

ASD.Document 600540 Rev. C
Solar illumination factors
A material with approximately 100% reflectance across the entire spectrum is
called a white reference panel or white reference standard.
Because the spectrometer only measures the intensity of a light field through a
given point in space, a white reference is one method to correlate that
measurement with the physical properties of the sample. Reflectance and
transmittance are inherent properties of all materials and are independent of
the light source.
The ASD application software, such as RS
ratios for reflectance or transmittance of the material being sampled by the
FieldSpec® 3 Spectroradiometer using the white reference as the standard.
Spectralon® from Labsphere is the white reference standard that is very
suitable for the VNIR and SWIR spectral ranges of ASD instruments.
65
Chapter 7 Field Measurements
3
and Indico, can calculate the
FieldSpec® 3 User Manual