5.1.5. Remote identification
Hamilton and Lodder [41] investigated the potential
implementation of a far field imaging system to identify
pharmaceutical capsules. Individual gelatin capsules, subjected
to degradation by exposure to formaldehyde, were
imaged from a distance of 500 m using a telescopic lens
interfaced with an NIR imaging system. Images were only
collected at 6 wavelengths to reduce data collection time.
Principal component regression of the spectra against time
of exposure to formaldehyde gave promising results
(r2 = 0.89, SEP = 1.17 h). Similar results were published
in another paper [44].