Enhanced real-time optical detection of micron-sized particles in water using standing ultrasonic wave fields

Mary-Grace C. Danao; Fred A. Payne; Clair L. Hicks; M. Pinar Mengü; Sue E. Nokes; Timothy S. Stombaugh

doi:10.1117/12.630719

9 November 2005 Enhanced real-time optical detection of micron-sized particles in water using standing ultrasonic wave fields

Mary-Grace C. Danao, Fred A. Payne, Clair L. Hicks, M. Pinar Mengü, Sue E. Nokes, Timothy S. Stombaugh

Author Affiliations +

Proceedings Volume 5994, Chemical and Biological Sensors for Industrial and Environmental Security; 59940Z (2005) https://doi.org/10.1117/12.630719
Event: Optics East 2005, 2005, Boston, MA, United States

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.

Citation Download Citation

Mary-Grace C. Danao, Fred A. Payne, Clair L. Hicks, M. Pinar Mengü, Sue E. Nokes, and 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); https://doi.org/10.1117/12.630719

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