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Identification of targets at remote distances with Raman spectroscopy

In the past few years, there has arisen an intense demand for new generation technologies which provide for the rapid and sensitive stand-off detection of explosive compounds and hazardous chemicals. This has been fueled, in large part, by the escalation of threats to homeland security and the debilitating effects of IED devices in both civilian and war zones. In this paper, we describe two portable stand-off Raman spectrometers which have been developed by DeltaNu and are intended for use in different test environments. The first, the DeltaNu ObserveR™, is a handheld785 nm laser device suited for the close range detection of explosive materials during nighttime operations, or indoors under restricted light conditions. The second device, the ObserveR LR, is a tripod-mounted, solar blind system that enables detection at longer distances (ca. <30 m) with reduced fluorescence interference. A condensed summary is presented of different tests that have been conducted using these devices, and results are discussed within the context of technological improvements that will be required to adequately meet the challenge of robust explosive material detection.