Home  Introduction What is Hyperspectral Imaging? |
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What is Hyperspectral Imaging?Hyperspectral imaging (HSI) has evolved from initial multi-band applications of the satellite imaging community. While these multi-band images were mainly based on spectral bands in the visible and near-infrared regions, hyperspectral imaging meanwhile includes full spectra of many possible spectroscopic techniques covering almost all regions of the electromagnetic spectrum and including mass spectra as well.Further, hyperspectral images obtained from different spectroscopic techniques are more and more combined into a single multisensor hypercube. This way complementary information of various spectroscopic techniques leads to a better interpretability of hyperspectral images. For example, sodium chloride is invisible in Raman imaging while sodium nitrate delivers a characteristic Raman spectrum. Thus when analysing for example particulate matter containing both species by Raman imaging the operator is effectively blind regarding the sodium chloride. In this case the combination of a Raman image with another technique sensible to sodium chloride is mandatory. The following image shows the NaNO3 particles colored in green.
As a complementary method energy dispersive xray spectroscopy could be used to detect sodium chloride. The following image shows the sodium nitrate in green color (detected by Raman spectroscopy) and the sodium chlorid in pink (detected by EDX). As you can see, some of the particles contain both sodium nitrate and chloride (darkblue spots).
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