3.1.1. Investigation of light sources and SW-NIR spectra
Different light source levels of 100, 200 and 400 W were
tested for this experiment. The SW-NIR spectra of mangosteens
featured noise and a low-level intensity when using a
low-level light source compared to using a higher level light
source. The spectra intensity of translucent flesh was excessive
when using a 400 W light source. However, at 100 W
mangosteens with hardening pericarp yielded very low-level
spectra and signal-to-noise ratios while the spectra of mangosteens
with translucent flesh were more strongly produced.
The results showed that the light level is one of the important
measurement conditions in order to correctly obtain
spectra of translucent flesh and internal disorders of mangosteens.
Therefore, we decided to use a 200 W light source,
which was deemed appropriate for this study. This was to
avoid excessive intensity with translucent flesh and to have