Design and Performance of a Three-wavelength LED-based Total Scatter and Backscatter Integrating Nephelometer
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 presentation reports on the design of the Aurora series of 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 artifacts using Mie-theory. Comparison measurements against the TSI 3563 with laboratory generated white particles and ambient air are 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
Nephelometer parameterization
Marie Laborde Thomas Müller Grant Kassell Alfred Wiedensohler
Paul Scherrer Institut,Villigen,Switzerland,5232 Leibniz-Institut für Troposphaenforschung,Permoserstraβe 15,Leipzig,Germany,04318 Ecotech Pty,1492 Ferntree Gully Road,Knoxfield,VIC,31
国际会议
西安
英文
147-153
2011-08-17（万方平台首次上网日期，不代表论文的发表时间）