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 Mengüç, Sue E. Nokes, Timothy S. Stombaugh

Research output: Contribution to journalConference articlepeer-review


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.

Original languageEnglish
Article number59940Z
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2005
EventChemical and Biological Sensors for Industrial and Environmental Security - Boston, MA, United States
Duration: Oct 24 2005Oct 26 2005


  • Detection
  • Particles
  • Real-time
  • Standing waves
  • Ultrasound
  • Water quality

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Enhanced real-time optical detection of micron-sized particles in water using standing ultrasonic wave fields'. Together they form a unique fingerprint.

Cite this