Technische Universität Wien
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Stand-off Raman scattering

Optical detection techniques also allow the design and construction of analyzers capable of remote detection. We developed a stand-off Raman system which uses a pulsed nanosecond laser (532 nm) to interrogate a distant sample, a telescope to capture the scattered light, a spectrograph and a gated iCCD camera for sensitive detection. Using this system we can identify chemical substances based on their Raman spectra up to a distance of 100 meters. Furthermore, by scanning of the laser and/or by performing time resolved detection we could also show that we can identify chemical substances present inside sealed plastic or glass containers.