Advancements in the Monitoring of Highly Concentrated Slurry Systems With Optical Low Coherence Reflectometry
Conference
·
OSTI ID:826052
Optical Low Coherence Reflectometry (OLCR) is a non-destructive optical technique that can be used to measure 180{sup o} coherent backscatter of light incident on a heterogeneous medium. Changes in particle size and concentration may be extracted from the OLCR decay profiles of highly concentrated slurries and emulsions, such as high-level waste. We have shown OLCR to be a valuable tool for monitoring changes in particle size over several orders of magnitude at high concentration. We have made significant progress in the analysis of signals obtained from multiscattering events. We have observed the appearance of Mie resonances, a nonmonotonic oscillation of backscattered intensity dependent on optical parameters, over the interval where radii are comparable to the wavelength. Fundamental science development performed on model systems is essential for the analysis of polydispersity and the complex effects of clustering, sedimentation, gelation and other dynamic changes which may occur in an environmental waste system.
- Research Organization:
- University of Washington, Seattle, WA (US)
- Sponsoring Organization:
- USDOE Office of Science (SC) (US)
- OSTI ID:
- 826052
- Country of Publication:
- United States
- Language:
- English
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