ASD Document 600540 Rev. J 10 FieldSpec® 3 User Manual
www.asdi.com Chapter 1 Introduction
Transmittance is the ratio of the radiant energy transmitted through a sample
to the radiant energy incident on the surface of the sample. Spectral
Transmittance is the transmittance as a function of wavelength.
Relative reflectance is computed by dividing the energy reflected from the
sample by the energy reflected off a white reference panel or standard.
Absolute reflectance is computed by multiplying the relative reflectance by
the known reflectance of the white reference panel.
With the reflectance of the reference standard available and known, the ASD
RS
3
or Indico applications can compute the absolute reflectance or
transmittance for the material being sampled.
Accessories for Light Sources and Probes
ASD offers several accessories for:
• Delivering illumination to the sample.
• Collecting reflected or transmitted light from the sample.
• Collecting reflected or transmitted radiance and irradiance from the
sample (where solar light is the primary source of illumination).
• Transmitting the collected light to the spectrometer.
Some accessories, such as many of the optional foreoptic probes, rely on other
illumination sources, and even solar light.
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