Design Considerations for a Portable Raman Probe Spectrometer for Field Forensics

Figure 12

The lower trace of this figure shows the experimental Raman spectrum of the thin-film Semtex sample of unknown provenance taken with the 830 nm prototype Raman imager. This is an expanded view of the spectrum shown in Figure 7, lower trace. The upper trace is a composite sum of the FT-Raman spectra of PETN and RDX Raman Stokes signals taken from Figure 10 (with an offset baseline). These spectra were used to derive the additive spectrum with RDX and PETN in a 7 : 2 ratio.