Determination of Radiative Transport Properties of Particle Suspensions by a Single-Scattering Experiment

Chae, Seung‐Hoon; Lee, HaeOk Skarda

doi:10.1080/02786829308959612

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…To calculate the bulk optical properties of a bead suspension using Mie theory, the solution needs to be sufficiently dilute to meet single-scattering condition. In the radiative transfer theory, one attenuation length has been long regarded as a rule of thumb for single scattering approximations [46,47]. The path length of laser beam of the LISST-VSF varies with the viewing angle, ranging from 10 to 20 cm; therefore, the criterion is that the attenuation coefficient of the sample should be < 5 m −1 .…”

Section: Calibration Experimentsmentioning

confidence: 99%

Calibration of the LISST-VSF to derive the volume scattering functions in clear waters

Zhang

Xiong

et al. 2019

Opt. Express

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The recently commercialized LISST-VSF instrument measures the volume scattering function (VSF) from 0.1°to 15°with a traditional laser diffraction unit (LISST) and from 15°to 155°with an eyeball component. Between these two optical components, only the LISST unit is calibrated. The eyeball measurements are scaled using the VSFs at 15°that are measured by both components. As this relative calibration relies on a valid measurement at 15°by the LISST, it might fail in clear oceanic waters, where the forward scattering is relative weak either due to a lack of large particles or an overall low concentration of all particles. In this study, we calibrated the LISST-VSF eyeball component through a series of lab experiments using standard polystyrene beads. Validation with the beads of two different sizes showed a median difference of 11.1% between theoretical and calibrated values. Further evaluations with in situ data collected by the LISST-VSF and an ECO-BB3 meter indicated that the new calibration worked well in both turbid and clear waters, while the relative calibration method tended to overestimate VSFs in clear waters.

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Section: Calibration Experimentsmentioning

confidence: 99%

Calibration of the LISST-VSF to derive the volume scattering functions in clear waters

Zhang

Xiong

et al. 2019

Opt. Express

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Analysis of multiple scattering errors in LISST-VSF volume scattering function measurements using Monte Carlo simulations and experimental data

et al. 2021

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A Monte Carlo algorithm has been developed to investigate the effects of multiple scattering on the volume scattering function measured by the LISST-VSF instrument. The developed algorithm is compared to experimental results obtained from bench-top measurements using 508 nm spherical polystyrene beads and Arizona test dust as scattering agents. The Monte Carlo simulation predicts measured volume scattering functions at all concentrations. We demonstrate that multiple scattered light can be a major contributor to the detected signal, resulting in errors in the measured volume scattering function and its derived inherent optical properties. We find a relative error of 10% in the scattering coefficient for optical depths ∼0.4, and it can reach 100% at optical depths ∼2.

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Investigation of the single scattering approximation through direct electromagnetic scattering simulation

Zhai

Wang

2021

OSA Continuum

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In this work, we investigate quantitatively the applicability conditions of single scattering approximation (SSA) through direct simulation of electromagnetic scattering by small volume elements filled with randomly distributed spherical particles. The influences of size parameter x, volume fraction fv, complex refractive index m and number N of particles on the nondimensional extinction cross section ηext and absorption cross section ηabs of particle groups are discussed. For non-absorbing particles with small size parameters (x = 0.1 and 0.2 in this study), due to the small phase shift across particles, the particle refractive index has almost no influence on the criteria for SSA. However, when the particle size increases or particle absorption is enhanced, the criteria for SSA will be closely related to the particle complex refractive index. Moreover, when the particle size is small, due to the weak multiple scattering between particles, the criteria for SSA can be regarded as the criteria for independent scattering approximation (ISA). But as the particles increase to relatively large sizes (x = 4.0 in this study), because of the enhancement of multiple scattering, the criteria for SSA and ISA should be treated differently. The widely used criteria obtained for bispheres may not be applicable to particle groups composed of lots of particles, and the optical thickness of dispersed media is not suitable for evaluating the applicability conditions of SSA. For particle groups composed of different particle numbers, due to the differences in dependent scattering and multiple scattering, the criteria for SSA are obviously different and the particle volume fraction should be small enough to make the SSA sufficiently accurate.

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Determination of Radiative Transport Properties of Particle Suspensions by a Single-Scattering Experiment

Cited by 3 publications

References 15 publications

Calibration of the LISST-VSF to derive the volume scattering functions in clear waters

Calibration of the LISST-VSF to derive the volume scattering functions in clear waters

Analysis of multiple scattering errors in LISST-VSF volume scattering function measurements using Monte Carlo simulations and experimental data

Investigation of the single scattering approximation through direct electromagnetic scattering simulation

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