Design Considerations for a Portable Raman Probe Spectrometer for Field Forensics
Figure 9
Raman Stokes signal of a 180 ng (~60 m diameter) RDX particle on a steel coupon. The spectrum was recorded using the Headwall/Andor prototype system, 6 mm 25 m slit, 200 lines/mm. The particle was illuminated with 300 mW of 830 nm laser light. The Andor Newton CCD camera accumulated twenty, 1 s exposures. The wavenumber scale was calibrated using the decanoic acid spectrum shown in Figure 5. The spectrum was baseline corrected utilizing a simple spline fit algorithm in Bruker’s OPUS software.