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Design and Characterization of a Modular On-Board Vehicle Aerosol Particle Sizer

Design and Characterization of a Modular On-Board Vehicle Aerosol Particle Sizer. Andrew Vize, University of Vermont, Master’s Candidate Electrical Engineering Matt Casari, University of Vermont, Master’s Candidate Electrical Engineering Advisors: Jeff Frolik Ph.D, Britt Holm é n Ph. D.

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Design and Characterization of a Modular On-Board Vehicle Aerosol Particle Sizer

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  1. Design and Characterization of a Modular On-Board Vehicle Aerosol Particle Sizer Andrew Vize, University of Vermont, Master’s Candidate Electrical Engineering Matt Casari, University of Vermont, Master’s Candidate Electrical Engineering Advisors: Jeff Frolik Ph.D, Britt Holmén Ph. D

  2. Outline • Introduction • Research Objective • Purpose • Theory of Operation • Components of the Preliminary Sensor Design • Current State of Research • Questions

  3. Introduction • So, what’s the problem? • We need a submicron particle sizing sensor that is: • Very Portable ( On-Board Vehicle or Personal Monitoring) • Low Power (Powered by Batteries) • Low Cost (Widespread Monitoring) • Why should we care about submicron particles? • The human lungs are susceptible to particles of this size range [1] • Alveolar Region of the Lungs Performs Gas Exchange • Particle Deposition Without Re-Entrainment 1. Dr. Chang-Yu Wu. Allen, Anne. "Aerosol Science & Engineering". University of Florida. February 12, 2009 <http://aerosol.ees.ufl.edu/respiratory/section01.html>.

  4. Theory of Operation • System Overview • Charge Particles with a Corona Ionizer • Inject Sheath Air • Deflect Particles in a Static Electric Field • Measure Charge Transfer with a Flexible Printed Circuit Board • Modular Design Promotes Ease of Cleaning & Repair

  5. Theory of Operation • Charging Particles with a Corona Ionizer Corona surrounded by a cloud of drifting free electrons Polydisperse Particulate Flow Charged Particles Uncharged Particles

  6. Theory of Operation • Injecting Sheath Gas • Sheath Module Envelopes Corona Module

  7. Theory of Operation

  8. Theory of Operation • Deflect Charged Particles in an Electric Field • Large Negative Potential on Center Electrode • Negatively Charged Particles Forced Away From Electrode Through Sheath Gas

  9. Theory of Operation • Use of the Flexible Printed Circuit Board • Constitutes a “Disposable Sensor Element” • Added Benefit of Striated Monodisperse Particle Deposits for Later Chemical Analysis pbc-togo.com

  10. Current State of Research • Literary Research Nearly Completed • Particle Trajectory Modeling • Corona Ionization Optimization Experiment • Geometric Design and Modeling • Electronic Amplification and Digital Storage Scheme • Noise Reduction Scheme • Looking Forward • Characterization • End User Documentation

  11. Questions?

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