Development of an Ultraviolet Raman Spectrometer for Standoff Detection of Chemicals

In this study, an ultraviolet Raman spectrometer was designed and fabricated to detect chemical contamination on the ground. The region of the Raman spectrum that indicated the characteristics of the chemicals was 350- 3800 cm(-1). To fabricate a Raman spectrometer operating in this range, the layout and angle of optical components of the spectrometer were designed using a grating equation. Experimental devices were configured to measure the Raman spectra of chemicals based on the fabricated Raman spectrometer. The wavenumber of the spectrometer was calibrated by measuring the Raman spectrum of polytetrafluoroethylene, O2, and N2. The spectral range of the spectrometer was measured to be 23.46 nm (3442 cm(-1)) with a resolution of 0.195 nm (30.3 cm(-1)) at 253.65 nm. After calibration, the main Raman peaks of cyclohexane, methanol, and acetonitrile were found to be similar to the references within a relative error of 0.55%.