| Raman spectroscopy | HSI |
---|---|---|
Analysed area | Spot size: 30 µm diameter | Pixel size: 13,000 µm across |
Counting time by spot or surface unit | ≈ 5 min | ≈ 0.33 mm s−1 |
Irradiance | 0.4 mW | ≈ 3.5 lux h |
Advantages | Identification can be made unequivocally through the use of characteristic peaks | Identification relies upon the comparison of reflectance spectra and must be backed up by another method of analysis |
Disadvantages | Limited spots can be analysed in a reasonable time frame | Larger areas can be scanned in a reasonable time allowing the user to ‘map’ important features |