Response to “Comment on Measurement of Aerosol Absorption Coefficient from Teflon Filters Using Integrating Plate and Integrating Sphere Techniques by D. Campbell, S. Copeland, and T. Cahill,” by Antony Clarke, John Ogren &amp; Robert Charlson

Campbell, Dave; Cahill, Thomas A.

doi:10.1080/02786829608965367

Cited by 8 publications

(2 citation statements)

References 14 publications

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“…The most common method for the measurement of aerosol absorption is to measure the change in optical transmission of particulates deposited onto a filter. 12,13 While the filter-based approaches offer several advantages ͑e.g., commercial availability, unattended operation, robustness, opera-tional inside an aircraft, low-tech method, and relatively fast response time͒, these filter-based techniques possess significant drawbacks that warrant cautious use. Chief among these drawbacks is artifact absorption.…”

Section: Introductionmentioning

confidence: 99%

Real-time detection of ambient aerosols using photothermal interferometry: Folded Jamin interferometer

Sedlacek

2006

Review of Scientific Instruments

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Work in our laboratory has been directed at the development of a new class of instrumentation that can directly measure ambient aerosol absorption through photothermal interferometry. The hallmark of this approach is its ability to directly measure aerosol absorption without interference from aerosol scattering since the signal originates from the thermal dissipation of the spectrally absorbed energy. While the principle of the photothermal technique for the detection of aerosols was demonstrated in the mid-1980s, this interferometric technique remains a laboratory technique largely due to sensitivity to mechanical vibrations and other environmental factors that result in unwanted signal interference and commensurate reduction in detection sensitivity. In order to realize its application outside the laboratory, a folded Jamin interferometer design has replaced both the traditional Mach-Zehnder and unfolded Jamin configurations. The folded Jamin affords many advantages, which include high degree of common mode noise rejection, insensitivity to rotation and translation of optical components, inherent double pass configuration, and compact size. In this article, we report on the performance of this optical configuration and present representative data for both absorbing and nonabsorbing aerosols.

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Section: Introductionmentioning

confidence: 99%

Real-time detection of ambient aerosols using photothermal interferometry: Folded Jamin interferometer

Sedlacek

2006

Review of Scientific Instruments

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“…One or more independent module was used to collect fine particles (equivalent aerodynamic diameter, EAD <2.5 µm) onto different types of filters appropriate for the various chemical analyses. The Teflo filter samples were analyzed for fine mass by gravimetric analysis (12), for light absorption coefficient by laser integrating plate method (13), for H by proton elastic scattering analysis (14), and for trace elements by particle-induced X-ray emission (14). Quartz filters were analyzed for organic and elemental carbon (OC and EC) by thermal optical reflectance (15).…”

Section: Methodsmentioning

confidence: 99%

Multilinear Model for Spatial Pattern Analysis of the Measurement of Haze and Visual Effects Project

Chueinta

Hopke

Paatero

2003

Environ. Sci. Technol.

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A multilinear model was developed for the analysis of the spatial patterns and possible sources affecting haze and its visual effects in the southwestern United States. The data from the project Measurement of Haze and Visual Effects (MOHAVE) collected during the late winter and mid-summer of 1992 at the monitoring sites in four states (i.e., California, Arizona, Nevada and Utah) were used in the study. The three-way data array was analyzed by a four-product-term model. This study makes a direct effort to include wind patterns as a component in the model in order to obtain the information of the spatial patterns of source contributions. The solution is computed using the conjugate gradient algorithm with applied non-negativity constraints. For the winter data set, reasonable solutions contained six sources and six wind patterns. The analysis of summer data required seven sources and seven wind patterns. The ME results are compared to the prior single-species empirical orthogonal function analysis results--and prior work describing the transport pathways.

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Aerosol light absorption and its measurement: A review

Moosmüller

Chakrabarty

Arnott

2009

Journal of Quantitative Spectroscopy and Radiative Transfer

750

580

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Response to “Comment on Measurement of Aerosol Absorption Coefficient from Teflon Filters Using Integrating Plate and Integrating Sphere Techniques by D. Campbell, S. Copeland, and T. Cahill,” by Antony Clarke, John Ogren & Robert Charlson

Cited by 8 publications

References 14 publications

Real-time detection of ambient aerosols using photothermal interferometry: Folded Jamin interferometer

Real-time detection of ambient aerosols using photothermal interferometry: Folded Jamin interferometer

Multilinear Model for Spatial Pattern Analysis of the Measurement of Haze and Visual Effects Project

Aerosol light absorption and its measurement: A review

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