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Field Raman Spectrograph

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AR #1673

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Tech ID: 873
Project Overview
The cone penetrometer is a heavy-weight truck with a hydraulic push system that is used for subsurface site characterization. In the standard configuration, the tip of the cone penetrometer rod is equipped with sensors that measure depth-discrete physical and geologic parameters of the subsurface. Detection instruments and sampling devices for water, gas, and soil have been modified and housed within the cone penetrometer rods to provide detailed contaminant information. The field-hardened Raman Spectrograph can be used to obtain "chemical fingerprints" of concentrated and dilute hazardous waste contaminants in storage tanks, soil and water. It is a portable, small, analytical device capable of in situ measurements that can identify compounds more than 50 meters away from the spectrometer via fiber optic probes.

Technology Description
 The overall purpose of this project is to develop and field demonstrate a portable Raman spectrograph and associated sampling accessories that can be used in the field for screening, monitoring, and identification of a wide variety of contaminants. This instrumentation development project combines fiber optics, Raman Spectroscopy, Echelle grating, lasers, micro-optical lenses, charged-coupled devices, and fiber-optically coupled deployable probe heads. The optics allow measurements to be made from more than 50 meters between the Raman instrument and probe head. The unit is designed to be capable of operating using modest power from a portable generator and could be integrated into an instrument platform. Key features of the project will be the fabrication of a fully fieldable spectrometer based on a breadboard version developed under an earlier DOE-sponsored project, development of an extensive library of DOE contaminants, and a field demonstration at Savannah River Site.

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