Design Considerations for a Portable Raman Probe Spectrometer for Field Forensics

Figure 3

Representative test Raman spectra of pure RDX accreted onto a quartz cuvette (a) and amino dinitrotoluene compound(s) (Supelco) likewise plated to a standard quartz cuvette (b). The spectra were recorded using the Headwall/Andor demo system with 40 mW of 785 nm excitation. Each spectrum above is the result of one, 1 s exposure. The mass, 𝑚, of material resolved in the focal area of each example is 19.6 ng, and 23.6 ng respectively, corresponding to a single rounded-particle radius 𝑟≈14.6 and 15.5 𝜇m, respectively [via: 𝑚  ≈ 1.5 g/cm³ · (4𝜋r ³/3), radius in cm].

(a)

(b)