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Portable LIBS and Raman Spectroscopy Standoff Chemical Analysis System

Proceedings article published in 2007 by Yunping Yang, Ranjit D. Pradhan, Russell M. Kurtz, Naresh Menon, Gajendra D. Savant
This paper is available in a repository.
This paper is available in a repository.

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Preprint: policy unknown
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Postprint: policy unknown
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Published version: policy unknown

Abstract

Combination of the trace element detection capability of Laser-Induced Breakdown Spectroscopy (LIBS) with Raman complex compound analysis to identify minerals promises to provide unprecedented specificity in chemical identification from a standoff distance. We present a new hybrid LIBS and Raman Spectroscopy standoff elemental, mineral, and isotope analysis system that offers a deployable instrument suitable for robotic missions in terms of in situ measurements, resolution, bandwidth, compact size, low cost, and ruggedness. A proof of concept tabletop (0.012 cubic meter sensing head; 0.03 cubic meter power supply) prototype has been developed and capability of up to 25 meters was demonstrated. Detection and identification of inorganic, organic, and mineral samples, including compounds associated with origins of life, has been demonstrated. Compounds related to buried explosives were also detected, and the capability to differentiate between explosives and similar compounds (such as fertilizers) was demonstrated. A compact, pulsed laser is used as the excitation laser for both LIBS and Raman spectroscopy. A single nonimaging multipurpose telescope assembly directs the laser beam away and to collect the radiation emanating from the microplasma, and the Stokes shifted spectra by means of a holographic element that eliminates the Rayleigh scattered laser light from the analysis signal. A miniature integrated multiband spectrometer (MIMS) analyzes the spectrum of the radiation collected by the nonimaging telescope subsystem, with a spectral resolution of <0.1 nm. Chemical fingerprinting software accurately identifies elements and compounds from measured LIBS and Raman spectra.