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Applied Spectroscopy

Applied Spectroscopy


  • Vol. 54, Iss. 6 — Jun. 1, 2000
  • pp: 800–806

Stand-off Detection of Chemicals by UV Raman Spectroscopy

Ming Wu, Mark Ray, K. Hang Fung, Mark W. Ruckman, David Harder, and Arthur J. Sedlacek

Applied Spectroscopy, Vol. 54, Issue 6, pp. 800-806 (2000)

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Experimental results are reported on a mobile, stand-alone, solarblind ultraviolet (UV) Raman lidar system for the stand-off detection and identification of liquid and solid targets at ranges of hundreds of meters. The lidar is a coaxial system capable of performing rangeresolved measurements of gases and aerosols, as well as solids and liquids. The transmitter is a flash lamp pumped 30 Hz Nd:YAG laser with quadrupled output at 266 nm. The receiver subsystem is comprised of a 40 cm Cassegrain telescope, a holographic UV edge filter for suppressing the elastic channel, a 0.46 m Czerny-Turner spectrometer, and a time gated intensified charge-coupled device (CCD) detector. The rejection of elastic light scattering by the edge filter is better than one part in 105, while the transmittance 500 cm-1 to the red of the laser line is greater than 50%. Raman data are shown for selected solids, neat liquids, and mixtures down to the level of 1% volume ratio. On the basis of the strength of the Raman returns, a stand-off detection limit of ~500 g/m2 for liquid spills of common solvents at the range of one half of a kilometer is possible.

Ming Wu, Mark Ray, K. Hang Fung, Mark W. Ruckman, David Harder, and Arthur J. Sedlacek, "Stand-off Detection of Chemicals by UV Raman Spectroscopy," Appl. Spectrosc. 54, 800-806 (2000)

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