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Infrared Analysis of Wastes Using Transient Infrared Spectroscopy (TIRS)

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Tech ID: 215
Project Overview
This project within the Mixed Waste Characterization, Treatment, and Disposal Focus Area (MWFA) applies TIRS to monitoring the waste loading in the encapsulated waste stream. Numerous on-site demonstrations of the technology involving several different wastes have been performed, during which a precision of better than 1% by weight was typically achieved. A TIRS monitor was built in FY96 for permanent installation at Rocky Flats, and personnel were trained in its operation.
Technology Description
TIRS is a noncontact, on-line analysis technique for process streams of solid or viscous-liquid material. TIRS provides a real-time chemical (molecular) analysis of the process stream. The surface of the molten encapsulated waste stream is cooled by a small air jet as it passes through the field of view of an infrared spectrometer. The stream radiates infrared by virtue of its high temperature. The alteration in the observed infrared spectrum caused by the cooling jet is used by the computer to derive the stream composition, or any other composition-related property.

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