Diffuse surface calibration method to improve accuracy and dynamic range of aerosol elastic light scattering measurements

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DOIResolve DOI: http://doi.org/10.1007/s00340-013-5357-x
AuthorSearch for: ; Search for: ; Search for:
TypeArticle
Journal titleApplied Physics B: Lasers and Optics
ISSN0946-2171
Pages16; # of pages: 6
AbstractA new method to calibrate detectors for elastic light scattering (ELS) measurement based on diffuse scattering from a Lambertian surface is presented. The method produces a calibration signal that is approximately seven orders of magnitude larger than a propane gas Rayleigh scattering calibration. The method also allows for calibration of detectors such as photodiodes, which are not sensitive enough to detect Rayleigh scattering for calibration but possess characteristics desirable for the measurement of soot ELS. Since the method is only suitable for backward scattering calibrations, transfer of calibration data from a backward- to a forward-oriented detector is accomplished with a secondary laser and integrating sphere. In demonstration experiments, calibration constants for photomultiplier tube (PMT) detectors obtained using both Rayleigh scattering and diffuse surface scattering agreed within experimental uncertainties as did measurements of in-flame scattering coefficients obtained with PMTs and photodiodes. However, achievable uncertainties with the diffuse-surface calibration approach were significantly reduced. More importantly, by enabling the use of photodiode detectors in ELS measurements, the new method facilitates operation at higher photon fluxes resulting in improved signal-to-noise ratios, reduced influence of photon shot noise, and the ability to achieve higher dynamic range in transient measurements. © 2013 Her Majesty the Queen in Right of Canada.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Measurement Science and Standards (MSS-SME)
Peer reviewedYes
NPARC number21269665
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Record identifier3aa3eebd-6966-4523-987b-cf0d1a7aaba5
Record created2013-12-13
Record modified2016-05-09
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