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Utilizing Nephelometers for Near Roadside John Carney Mark Phelps Andrew Tolley American Ecotech

Utilizing Nephelometers for Near Roadside John Carney Mark Phelps Andrew Tolley American Ecotech. Roadside Monitoring. Nephelometers 101. LED module. Temp RH sensor. Sample inlet. Sample outlet. Reference shutter motor. Pressure sensor. PMT,HV supply, pre amp. Light trap. PMT signal.

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Utilizing Nephelometers for Near Roadside John Carney Mark Phelps Andrew Tolley American Ecotech

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  1. Utilizing Nephelometers for Near RoadsideJohn CarneyMark PhelpsAndrew TolleyAmerican Ecotech

  2. Roadside Monitoring

  3. Nephelometers 101 LED module Temp RH sensor Sample inlet Sample outlet Reference shutter motor Pressure sensor PMT,HV supply, pre amp Light trap PMT signal Measurement bench

  4. Nephelometer Readings

  5. Evolution of LED Light Source • The first generation in LED Light Source introduced in 2002 Three Wavelength

  6. Evolution of LED Light Source Next Generation of LED Lightsource

  7. Evolution of LED Light Source Advantages • Stable light intensity • Stable light wavelength generation • Bandpass filters not required • Negligible thermal interference during measurement • Minimal mthly maint. (<10 minutes per month!)

  8. Evolution of LED Light Source Opal Diffuser in front of LED array Result – Light intensity approaching Lambertian distribution resulting in negligible error.

  9. Evolution of LED Light Source New Generation of LED Lightsource • Fewer LEDs – Three lamps per wavelength • Compact Light Source • Further reduction in measurement bench heating (between sample and ambient temperature) • User adjustable intensity pots (extend lifetime of light source) • Fully field serviceable • Backwards compatible with older units.

  10. Field Applications • Near Roadside Monitoring • Dust Monitoring • Forest Fire/Smoke Monitoring • PM Correlation Monitoring • Solar Energy Site Assessment and Operation

  11. Near Roadside • I-40 Station – Raleigh • Gas Analyzers (NOx, Ozone) • Particulate Monitors (BAM, Aethalometer, Ultrafine) • Samplers (passive, TSP)

  12. Installation

  13. Installation

  14. Preliminary Data

  15. Preliminary Data

  16. Preliminary Data

  17. Preliminary Data

  18. Dust Monitoring Sydney Dust Storm – September 2009

  19. New South Wales EPA Air Monitoring Network

  20. Field Applications

  21. Field Applications

  22. Field Applications Victoria EPA Forest Fire alert categories based on PM10 and visibility

  23. Smoke Monitoring New South Wales Air Quality October 20, 2013 8:00 – 9:00 AEST Brush Fire Event Nephelometer – hourly average based on 1 or 5 minute (high frequency) data, capturing smoke event as it occurs

  24. Smoke Monitoring

  25. Portable Functionality

  26. Correlation of Nephelometers Correlation of PM2.5 measurements and scattering coefficients Puget Sound Clean Air Agency Study – Residential Area • Collocated Instruments: • American Ecotech Nephelometer • Radiance Research (RR) Nephelometer • Partisol (FRM) for PM2.5 • TEOM with PM2.5 head • TEOM (FDMS-TEOM) PM2.5 head • BAM 1020 PM2.5

  27. Particulate Monitors FRM vs. Nephelometer

  28. Particulate Monitors FDMS TEOM vs. Nephelometer

  29. Particulate Monitors BAM vs. Nephelometer

  30. Particulate Monitors Results Nephelometer correlates well(r2 > 0.94) with: • The US Federal Reference Method • FDMS-TEOM • FEM Beta Attenuation Monitor

  31. Particulate Monitors Continuous Correlation – Aurora Neph and BAM-1020

  32. Renewable Energy Field Courtesy of yesRenewables

  33. Acknowledgments Sue Kimbrough and Richard Snow – USEPA Office of Research and Development

  34. Contact information Email: jcarney@americanecotech.com Web: www.AmericanEcotech.com

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