9 November 2005 Enhanced real-time optical detection of micron-sized particles in water using standing ultrasonic wave fields
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Abstract
The overall goal of the research was to develop a water quality monitoring system that simultaneously concentrates micron-size particles and bacterial cells in the nodal planes of a standing ultrasonic wave field and monitors the level of contamination using light transmission measurements. Ultrasonic concentration is an attractive method for in-line, continuous sensing since it has no moving parts and is not limited by a physical barrier, e.g., a filter, which may get plugged over time. The degree of concentration was evaluated over a range of initial particle concentration. Results showed that particle banding occurred within seconds of sonication - allowing for real-time analysis - and the degree of concentration increased with decreasing initial concentration of particles in the suspension. Concentration factors of 5 to 10 were achievable. Results from this study can be used in the design and fabrication of sensitive water quality monitoring systems that would permit real-time water quality analysis.
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Mary-Grace C. Danao, Mary-Grace C. Danao, Fred A. Payne, Fred A. Payne, Clair L. Hicks, Clair L. Hicks, M. Pinar Mengü, M. Pinar Mengü, Sue E. Nokes, Sue E. Nokes, Timothy S. Stombaugh, Timothy S. Stombaugh, } "Enhanced real-time optical detection of micron-sized particles in water using standing ultrasonic wave fields", Proc. SPIE 5994, Chemical and Biological Sensors for Industrial and Environmental Security, 59940Z (9 November 2005); doi: 10.1117/12.630719; https://doi.org/10.1117/12.630719
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