ASD Document 600540 Rev. J 85 FieldSpec® 3 User Manual
www.asdi.com Appendix B Reference Information
B.1.14 What are these upward or downward spikes in VNIR
data?
These result from artificial light sources, in particular fluorescent lights.
B.1.15 What are these steps in my data?
Light is brought into the instrument by various combinations of the strands in
the fiberoptic cable. Each strand has its own field-of-view (FOV). When the
cable is held close to the sample, each strand views slightly different portions
of the sample. This can result in the stepped data.
Hold the end of the fiber cable further away from the sample to allow the
FOV of the individual strands to overlap and mesh together.
Stepping of data is common when the foreoptic has a lens, and less common
when using the bare optics or sampling devices.
Figure B-3 Spectrum of fluorescent lights
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