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Instrumentation for acquisition of Chemical Images varies
from lab to lab: some research facilities have built their
own instruments; others have purchased commercially
available complete systems. The two main types of Chemical
Imaging system are discussed here, namely staring imager
and pushbroom configurations. Both configurations are
applicable to both Raman and NIR imaging; although, as
previously mentioned, the staring imager configuration is
commonly applied to NIR-CI investigations, the pushbroom
system is more typically applied to Raman mapping
experiments. While the components of these systems vary,
they can be schematically represented as in Fig. 2. The following
general components are usually required: illumination
source, imaging optic, spectral encoder for wavelength
selection, detector and acquisition system (usually a framegrabber
board interfaced with a PC). Advances in the production
of low cost array detectors have meant faster data
collection and cheaper Chemical Imaging systems; detection
time depends on spatial and spectral resolution
required, escalating with increasing resolution.
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