Standoff Raman measurement with COTS components

Julia H. Rentz; Craig R Schwarze; Robert M Vaillancourt; Michael Hercher

doi:10.1117/12.514057

27 February 2004 Standoff Raman measurement with COTS components

Julia H. Rentz, Craig R Schwarze, Robert M Vaillancourt, Michael Hercher

Proceedings Volume 5268, Chemical and Biological Standoff Detection; (2004) https://doi.org/10.1117/12.514057
Event: Optical Technologies for Industrial, Environmental, and Biological Sensing, 2003, Providence, RI, United States

Abstract

We present our work towards developing a compact reflector telescope (CRT) for short-range (1 to 50 m) standoff Raman LIDAR applications, including a standoff Raman measurement employing our telescope wiht a commercial off the shelf (COTS) laser, spectrometer, and Raman edge filter. This development effort was funded through an SBIR contract from the Department of Energy. The application of this technology is standoff assessment of chemical spills. The CRT system includes a small Galilean telescope to deliver the excitation beam to the surface under investigation; the benefit of the delivery optics is a smaller laser spot at the target and significantly enhanced throughput relative to systems which rely on the divergence of the excitation laser beam. The CRT itself is a 10-inch Cassegrain optimized for this short standoff range with motor-driven focus adjustment. We executed a Raman measurement of acetone at a standoff of 2 m using a Midwest Laser 325 nm helium cadmium laser, an Ocean Optics USB2000 grating spectrometer (with uncooled CCD), and an Omega edge filter. We present the results overlayed with published reference spectra. To the best of our knowledge, this is the first reported standoff Raman measurement performed with an uncooled CCD detector.

Citation Download Citation

Julia H. Rentz, Craig R Schwarze, Robert M Vaillancourt, and Michael Hercher "Standoff Raman measurement with COTS components", Proc. SPIE 5268, Chemical and Biological Standoff Detection, (27 February 2004); https://doi.org/10.1117/12.514057

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