Design Considerations for a Portable Raman Probe Spectrometer for Field Forensics
Figure 5
Comparison of Raman signals from decanoic acid. The bottom trace (red) is from the Headwall/Andor prototype dispersive system using 300 mW of 830 nm excitation laser for a decanoic acid packed in an aluminum cup. This spectrum is the result of twenty, 1 s exposures. The top trace (black) is from FT-Raman database (at 2 cm−1 resolution) using 300 mW of 1064 nm excitation with the sample packed into an aluminum cup. The FT-Raman spectrum is the result of coadding 2000 interferograms. The dispersive data are wavelength calibrated against the noted line assignments from the FT-Raman spectrum.
