World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Design and Performance of a Three-wavelength Led-based Total Scatter and Backscatter Integrating Nephelometer : Volume 4, Issue 6 (29/06/2011)

By Müller, T.

Click here to view

Book Id: WPLBN0003974889
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: Design and Performance of a Three-wavelength Led-based Total Scatter and Backscatter Integrating Nephelometer : Volume 4, Issue 6 (29/06/2011)  
Author: Müller, T.
Volume: Vol. 4, Issue 6
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Laborde, M., Kassell, G., Wiedensohler, A., & Müller, T. (2011). Design and Performance of a Three-wavelength Led-based Total Scatter and Backscatter Integrating Nephelometer : Volume 4, Issue 6 (29/06/2011). Retrieved from http://www.ebooklibrary.org/


Description
Description: Leibniz Institute for Tropospheric Research, Leipzig, Germany. Integrating nephelometers are instruments that directly measure a value close to the light scattering coefficient of airborne particles. Different models of nephelometers have been used for decades for monitoring and research applications. Now, a series of nephelometers (Ecotech models M9003, Aurora 1000 and Aurora 3000) with newly designed light sources based on light emitting diodes are available. This article reports on the design of these integrating nephelometers and a comparison of the Aurora 3000 to another commercial instrument (TSI model 3563) that uses an incandescent lamp. Both instruments are three-wavelength, total and backscatter integrating nephelometers.

We present a characterization of the new light source design of the Aurora 3000 and provide parameterizations for its angular sensitivity functions. These parameterizations facilitate to correct for measurement artefacts using Mie-theory. Furthermore, correction factors are provided as a function of the Ångström exponent. Comparison measurements against the TSI 3563 with laboratory generated white particles and ambient air are also shown and discussed. Both instruments agree well within the calibration uncertainties and detection limit for total scattering with differences less than 5 %. Differences for backscattering are higher by up to 11 %. Highest differences were found for the longest wavelengths, where the signal to noise ratio is lowest. Differences at the blue and green wavelengths are less than 4 % and 3 %, respectively, for both total and backscattering.


Summary
Design and performance of a three-wavelength LED-based total scatter and backscatter integrating nephelometer

Excerpt
Anderson, T. L. and Ogren, J. A.: Determining aerosol radiative properties using the TSI 3563 integrating nephelometer, Aerosol Sci. Tech., 29, 57–69, 1998.; Anderson, T. L., Covert, D. S., Marshall, S. F., Laucks, M. L., Charlson, R. J., Waggoner, A. P., Ogren, J. A., Caldow, R., Holm, R. L., Quant, F. R., Sem, G. J., Wiedensohler, A., Ahlquist, N. A., and Bates, T. S.: Performance characteristics of a high-sensitivity, three-wavelength, total scatter/backscatter nephelometer, J. Atmos. Oceanic Technol., 13, 967–986, 1996.; Beuttell, R. G. and Brewer, A. W.: Instruments for the measurement of the visual range, J. Sci. Instr. Phys. Ind., 26, 357–359, 1949.; Andrews, E., Sheridan, P. J., Fiebig, M., McComiskey, A., Ogren, J. A., Arnott, P., Covert, D., Elleman, R., Gasparini, R., Collins, D., Jonsson, H., Schmid, B., and Wang, J.: Comparison of methods for deriving aerosol asymmetry parameter, J. Geophys. Res.-Atmos., 111, D05S04, doi:10.1029/2004JD005734, 2006.; Bohren, C. F. and Huffman D. R., Absorption and Scattering of Light by Small Particles, Wiley, New York, 1983.; Bond, T. C., Covert, D. S., and Müller, T., Truncation and Angular-Scattering Corrections for Absorbing Aerosol in the TSI 3563 Nephelometer, Aerosol Sci. Tech., 43, 866–871, 2009.; Buchholz, A.: Rayleigh scattering calculations for the terrestrial atmosphere, Appl. Optics, 34, 2765–2773, 1995.; Charlson, R. J., Porch, W. M., Waggoner, A. P., and Ahlquist, N. C.: Background aerosol light-scattering characteristics – nephelometric observations at Mauna-Loa-observatory compared with results at other remote locations, Tellus, 26, 345–360, 1974.; DeCarlo, P., Slowik, J., Worsnop, D., Davidovits, P., and Jimenez, J.: Particle Morphology and Density Characterization by Combined Mobility and Aerodynamic Diameter Measurements, Part 1: Theory, Aerosol Sci. Tech., 38, 1185–1205, 2004.; Ecotech, Aurora 3000 User manual 1.3, November 2009.; Heintzenberg, J.: The angular calibration of the total scatter/backscatter nephelometer, consequences and application, Staub-Reinhalt. Luft, 38, 62–63, 1978.; Heintzenberg, J. and Charlson, R. J.: Design and applications of the integrating nephelometer: A review, J. Atmos. Oceanic Technol., 13, 987–1000, 1996.; Heintzenberg, J., Wiedensohler, A., Tuch, T. M., Covert, D. S., Sheridan, P., Ogren, J. A., Gras, J., Nessler, R., Kleefeld, C., Kalivitis, N., Aaltonen, V., Wilhelm, R. T., and Havlicek, M.: Intercomparisons and aerosol calibrations of 12 commercial integrating nephelometers of three manufacturers, J. Atmos. Oceanic Technol., 23, 902–914, 2006.; Marshall, S. F., Covert, D. S., and Charlson, R. J.: Relationship between asymmetry parameter and hemispheric backscatter ratio – implications for climate forcing by aerosols, Appl. Optics, 34, 6306–6311, 1995.; Massoli, P., Murphy, D. M., Lack, D. A., Baynard, T., Brock, C. A., and Lovejoy, E. R.: Uncertainty in Light Scattering Measurements by TSI Nephelometer: Results from Laboratory Studies and Implications for Ambient Measurements, Aerosol Sci. Tech. 43, 1064–1074, 2009.; Moosmüller, H. and Arnott, W. P.: Angular truncation errors in integrating nephelometry, Rev. Sci. Instrum., 74, 3492–3501, 2003.; Müller, T., Nowak, A., Wiedensohler, A., Sheridan, P., Laborde, M., Covert, D. S., Marinoni, A., Imre, K., Henzing, B., Roger, J. C., dos Santos, S. M., Wilhelm, R., Wang, Y. Q., and de Leeuw, G.: Angular Illumination and Truncation of Three Different Integrating Nephelometers: Implications for Empirical, Size-Based Corrections, Aerosol Sci. Tech., 43, 581–586, 2009.; Wang, S. C. and Flagan, R. C.: Scanning electrical mobility spectrometer, J. Aerosol Sci., 20, 1485–1488, 1989.; Wex, H., Neusüß, C., Wendisch, M., Stratmann, F., Koziar, C., Keil, A., Wiedensohler, A., and Ebert, M: Particle scattering, backscattering, and absorption coefficients: An in situ closure and sensitivity study, J. Geophys. Res.-Atmos. 10

 

Click To View

Additional Books


  • On the Interpretation of the Loading Cor... (by )
  • Methane Emission Estimates Using Chamber... (by )
  • Performance of High-resolution X-band We... (by )
  • A Novel Approach for Absolute Radar Cali... (by )
  • Modified Ultrafast Thermometer Uft-m and... (by )
  • Multi-sensor Aerosol Products Sampling S... (by )
  • A Method to Improve the Determination of... (by )
  • Speeding up the Aot Retrieval Procedure ... (by )
  • Integrated Method for the Measurement of... (by )
  • Interpreting Sbuv Smoothing Errors: an E... (by )
  • Comparison Between Caribic Aerosol Sampl... (by )
  • Tracking Isotopic Signatures of Co2 at t... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.