ASD Document 600541 Rev. G 9 TerraSpec® User Manual
www.asdi.com Chapter 1 Introduction
Relative reflectance is computed by dividing the energy reflected from the
sample by the energy reflected off a white reference panel or standard.
Accessories for Light Sources and Probes
ASD offers several accessories for:
• Delivering illumination to the sample
• Collecting reflected or transmitted light from the sample
• Transmitting the collected light to the spectrometer
Some accessories, such as the Hi-Brite Contact Probe, perform all of these
functions. Other accessories, such as some of the optional foreoptic probes,
rely on other illumination sources.
Accurate analysis of collected spectra requires an adequate level of incident
light on the sample. The Hi-Brite Contact Probe accessory is designed for
stability and accuracy and provides a controlled source of incident light
having a color temperature of 3,000°K. The probe is powered by the
accessory power port of the TerraSpec spectrometer. Characteristics of the
light source are eliminated when the white reference (or baseline spectrum) is
applied to each raw sample spectrum.
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