Laboratory measurements of light scattering properties of kaolinite dust at 532 nm

Ron, LI; Tang, Guangwu; Ding, Jiachen; Logan, Timothy; Brooks, Sarah D.; Collins, D. R.; Yang, Ping; Kattawar, George W.

doi:10.1080/02786826.2018.1444729

Cited by 5 publications

(2 citation statements)

References 56 publications

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“…Broadly, polar nephelometer designs can be categorized into three groups (Barkey et al, 2012). Goniometer-type nephelometers conduct ra-diometric and polarimetric measurements using a detector mounted on a rotatable arm (Li et al, 2018;Horvath et al, 2018;Waldram, 1945). These instruments can achieve high angular resolution at the expense of a relatively low time resolution.…”

Section: Introductionmentioning

confidence: 99%

Concept, absolute calibration, and validation of a new benchtop laser imaging polar nephelometer

Moallemi¹,

Modini²,

Brem³

et al. 2023

Atmos. Meas. Tech.

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Abstract. Polar nephelometers provide in situ measurements of aerosol angular light scattering and play an essential role in validating numerically calculated phase functions or inversion algorithms used in space-borne and land-based aerosol remote sensing. In this study, we present a prototype of a new polar nephelometer called uNeph. The instrument is designed to measure the phase function, F11, and polarized phase function, -F12/F11, over the scattering range of around 5 to 175∘, with an angular resolution of 1∘ at a wavelength of 532 nm. In this work, we present details of the data processing procedures and instrument calibration approaches. uNeph was validated in a laboratory setting using monodisperse polystyrene latex (PSL) and di-ethyl-hexyl-sebacate (DEHS) aerosol particles over a variety of sizes ranging from 200 to 800 nm. An error model was developed, and the level of agreement between the uNeph measurements and Mie theory was found to be consistent within the uncertainties in the measurements and the uncertainties in the input parameters for the theoretical calculations. The estimated measurement errors were between 5 % and 10 % (relative) for F11 and smaller than ∼ 0.1 (absolute) for -F12/F11. Additionally, by applying the Generalized Retrieval of Aerosol and Surface Properties (GRASP) inversion algorithm to the measurements conducted with broad unimodal DEHS aerosol particles, the volume concentration, size distribution, and refractive index of the ensemble of aerosol particles were accurately retrieved. This paper demonstrates that the uNeph prototype can be used to conduct accurate measurements of aerosol phase function and polarized phase function and to retrieve aerosol properties through inversion algorithms.

show abstract

Section: Introductionmentioning

confidence: 99%

Concept, absolute calibration, and validation of a new benchtop laser imaging polar nephelometer

Moallemi¹,

Modini²,

Brem³

et al. 2023

Atmos. Meas. Tech.

View full text Add to dashboard Cite

show abstract

“…Broadly, polar nephelometer designs can be categorized into three groups (Barkey et al, 2012). Goniometertype nephelometers conduct radiometric and polarimetric measurements using a detector mounted on a rotatable arm (Li et al, 2018;Horvath et al, 2018;Waldram, 1945). These instruments can achieve high angular resolution at the expense of relatively 65 https://doi.org/10.5194/egusphere-2023-392 Preprint.…”

mentioning

confidence: 99%

Concept, absolute calibration and validation of a new, bench-top laser imaging polar nephelometer

Moallemi

Modini

Brem

et al. 2023

Preprint

View full text Add to dashboard Cite

Abstract. Polar nephelometers provide in situ measurements of aerosol angular light scattering and play an essential role in validating numerically calculated phase functions or inversion algorithms used in space-borne and land-based aerosol remote sensing. In this study, we present a prototype of a new polar nephelometer called uNeph. The instrument is designed to measure the phase function, F11, and polarized phase function, –F12/F11 over the scattering range of around 5° to 175° with an angular resolution of 1° at a wavelength of 532 nm. In this work, we present details of the data processing procedures and instrument calibration approaches. The uNeph was validated in a laboratory setting using mono-disperse polystyrene latex (PSL) and Di-Ethyl-Hexyl-Sebacate (DEHS) aerosol particles over a variety of sizes, ranging from 200 nm to 800 nm. An error model was developed and the level of agreement between uNeph measurements and Mie theory was found to be consistent within the uncertainties of the measurements and the uncertainties of the input parameters for the theoretical calculations. The estimated measurement errors were between 5 % to 10 % (relative) for F11 and smaller than ~0.1 (absolute) for –F12/F11. Additionally, by applying the Generalized Retrieval of Aerosol and Surface Properties (GRASP) inversion algorithm to the measurements conducted with broad unimodal DEHS aerosol particles, the volume concentration, size distribution and refractive index of the ensemble of aerosol particles were accurately retrieved. This paper demonstrates that the uNeph prototype can be used to conduct accurate measurements of aerosol phase function and polarized phase function and to retrieve aerosol properties through inversion algorithms.

show abstract

Optimization of the Polarized Imaging Nephelometer (PI-Neph) for continuous monitoring of multiwavelength aerosol phase functions in support of space polarimetry missions

Bazo,

Martins,

Perez-Ramirez

et al. 2024

Atmospheric Environment

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Laboratory measurements of light scattering properties of kaolinite dust at 532 nm

Cited by 5 publications

References 56 publications

Concept, absolute calibration, and validation of a new benchtop laser imaging polar nephelometer

Concept, absolute calibration, and validation of a new benchtop laser imaging polar nephelometer

Concept, absolute calibration and validation of a new, bench-top laser imaging polar nephelometer

Optimization of the Polarized Imaging Nephelometer (PI-Neph) for continuous monitoring of multiwavelength aerosol phase functions in support of space polarimetry missions

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