Turbid Underwater Polarization Patterns Considering Multiple Mie Scattering of Suspended Particles

2020 ◽  
Vol 86 (12) ◽  
pp. 737-743
Author(s):  
Haoyuan Cheng ◽  
Jinkui Chu ◽  
Ran Zhang ◽  
Lianbiao Tian ◽  
Xinyuan Gui
Keyword(s):  
Rayleigh Scattering ◽  
Field Measurements ◽  
Distribution Patterns ◽  
Suspended Particles ◽  
Mie Scattering ◽  
Polarization Pattern ◽  
Polarization Distribution ◽  
Water Turbidity ◽  
Influence Of Water ◽  
Mie Scattering Theory

It is still unclear how water turbidity affects the underwater polarization pattern. Current simulations only consider single Rayleigh scattering of water molecules and ignore multiple Mie scattering of suspended particles. In this study, a method based on a combination of Monte Carlo numerical simulation and Mie scattering theory is used to establish a model of the turbid underwater polarization distribution. Stokes vector and Mueller matrix are used to simulate the underwater polarization patterns within Snell's window. The distribution patterns and dynamic changes of the simulation are consistent with field measurements. The maximum depth that the polarization pattern can be maintained is calculated for different water types. The influence of water turbidity on polarization patterns is discussed. This model provides a tool for researchers to quantitatively analyze the distribution of turbid underwater polarization. In addition, the study is valuable for remote sensing and marine surveillance.

Radiative Properties for Fire Suppression Environments Using a Correlated-k Method

2005 ◽  
Author(s):  
William F. Godoy ◽  
Paul E. DesJardin
Keyword(s):  
Rayleigh Scattering ◽  
Fire Suppression ◽  
Mie Scattering ◽  
Distribution Functions ◽  
Radiative Properties ◽  
Cumulative Distribution ◽  
Participating Media ◽  
Property Evaluation ◽  
Highly Sensitive ◽  
Mie Scattering Theory

This study uses the correlated-k (c-k) and Mie scattering theory to evaluate absorption and scattering properties of participating media for fire suppression environments. In this approach the irregular spectral distribution of the radiative properties is reordered into cumulative distribution functions on a narrow band basis increasing the speed of property evaluation when compared to line-by-line calculations. The spectral properties are determined from the HITEMP database for carbon dioxide and water vapor, along with Mie and Rayleigh scattering theories for water droplets and soot particles, respectively. Results are presented for radiative heat transfer in a 1D domain for several mixtures and show that the attenuation of the radiation is highly sensitive to the water droplet size, mass loading and soot particle concentration.

scholarly journals Measurement report: aerosol hygroscopic properties extended to 600 nm in the urban environment

2021 ◽  
Vol 21 (3) ◽  
pp. 1375-1388
Author(s):  
Chuanyang Shen ◽  
Gang Zhao ◽  
Weilun Zhao ◽  
Ping Tian ◽  
Chunsheng Zhao
Keyword(s):  
Growth Factor ◽  
Size Range ◽  
Large Fraction ◽  
Field Measurements ◽  
Mie Scattering ◽  
Submicron Particles ◽  
Light Extinction ◽  
Composition Analysis ◽  
Hygroscopic Properties ◽  
Mie Scattering Theory

Abstract. Submicron particles larger than 300 nm dominate the aerosol light extinction and mass concentration in the atmosphere. The water uptake ability of this size range greatly influences the particle mass, visibility degradation, and particle chemistry. However, most previous field measurements on aerosol hygroscopicity are limited within 350 nm. In this study, the size-resolved aerosol hygroscopic properties over an extended size range (50–600 nm) at 85 % relative humidity were investigated in Beijing winter from 27 November 2019 to 14 January 2020 using a humidity tandem differential mobility analyzer (HTDMA) instrument. The corresponding aerosol optical properties were also analyzed using the Mie scattering theory. Results show that the averaged probability distribution of growth factor (GF-PDF) is generally constituted by a more hygroscopic (MH) group and a less hygroscopic (LH) group (including hydrophobic). For the particles larger than 300 nm, there exists a large fraction of LH group particles, resulting in an unexpected low hygroscopicity. During the development of pollution, when particles are gradually aged and accumulated, the bulk hygroscopicity above 300 nm is enhanced significantly by the growth and expansion of the MH group. This result is supported by previous chemical composition analysis, and we give more direct and detailed evidence from the growth factor and mixing-state aspects. Our calculations indicate that the optical contribution of particles larger than 300 nm constitutes about two-thirds of the total aerosol extinction. The large hygroscopic variation in aerosols above 300 nm will influence the light degradation comparably with the increase in aerosol loading in low-visibility haze events. Our studies highlight that the hygroscopic properties above 300 nm are complex and vary greatly with different pollution stages. Therefore more field measurements and investigations need to be done in the future.

Study on Properties of Light Scattering Based on Mie Scattering Theory for Suspended Particles in Water

2015 ◽  
Vol 52 (1) ◽  
pp. 013001
Author(s):  
Vo Quang Sang Vo Quang Sang ◽  
冯鹏 Feng Peng ◽  
汤斌 Tang Bin ◽  
赵敬晓 Zhao Jingxiao ◽  
蒋上海 Jiang Shanghai ◽  
...  
Keyword(s):  
Light Scattering ◽  
Scattering Theory ◽  
Suspended Particles ◽  
Mie Scattering ◽  
Mie Scattering Theory

scholarly journals Enhanced Radar Scattering From Water Inclusions In Ice

1988 ◽  
Vol 34 (118) ◽  
pp. 293-296 ◽  
Author(s):  
J.L. Bamber
Keyword(s):  
Scattering Theory ◽  
Rayleigh Scattering ◽  
Mie Scattering ◽  
General Analysis ◽  
Plane Boundary ◽  
Scattered Power ◽  
Radar Scattering ◽  
Radio Echo Sounding ◽  
Polar Research Institute ◽  
Mie Scattering Theory

Abstract It is believed that water-filled cavities on the scale of decimetres are present in a number of glaciers in Spitsbergen. The evidence for this hypothesis comes from airborne radio echo-sounding records collected by the Scott Polar Research Institute in 1983. The size of these cavities prevents the use of Rayleigh scattering theory and requires a more general analysis. Mie scattering theory is used to investigate the scattered power providing some unexpected results, the most significant of which is that for water bodies greater than approximately 0.25 m in radius the returned power from the volume illuminated is greater than that from a perfectly reflecting plane boundary.

scholarly journals Measurement report: Aerosol hygroscopic properties extended to 600 nm in the urban environment

2020 ◽  
Author(s):  
Chuanyang Shen ◽  
Gang Zhao ◽  
Weilun Zhao ◽  
Ping Tian ◽  
Chunsheng Zhao
Keyword(s):  
Size Range ◽  
Large Fraction ◽  
Field Measurements ◽  
Mie Scattering ◽  
Submicron Particles ◽  
Light Extinction ◽  
Composition Analysis ◽  
Hygroscopic Properties ◽  
Mie Scattering Theory ◽  
Aerosol Hygroscopicity

Abstract. Submicron particles larger than 300 nm dominate the aerosol light extinction and mass concentration in the atmosphere. The water uptake ability of this size range greatly influences the particle mass, visibility degradation and particle chemistry. However, most of previous field measurements on aerosol hygroscopicity are limited within 350 nm. In this study, the size-resolved aerosol hygroscopic properties over extended size range (50–600 nm) at 85 % relative humidity were investigated in Beijing winter from 27 November 2019 to 14 January 2020 using a Humidity Tandem Differential Mobility Analyser (HTDMA) instrument. The corresponding aerosol optical properties were also analyzed using the Mie scattering theory. Results show that the averaged probability distribution of GF (GF-PDF) is generally a constitute of a more-hygroscopic (MH) group and a less-hygroscopic (LH) group (including hydrophobic). For the particles larger than 300 nm, there exist a large fraction of LH group particles, resulting in an unexpected low hygroscopicity. During the development of pollution when particles are gradually aged and accumulated, the bulk hygroscopicity above 300 nm is enhanced significantly by the growth and expansion of MH group. This result is supported by previous chemical composition analysis and we give a more direct and detailed evidence from growth factor and mixing state aspects. Our calculations indicate that the optical contribution of particles larger than 300 nm constitutes about 2/3 of the total aerosol extinction. The large hygroscopic variation of aerosols above 300 nm will influence the light degradation comparably with the increase of aerosol loading in the low visibility haze events. Our studies highlight that the hygroscopic properties above 300 nm are complex and vary greatly with different pollution stages, therefore more field measurements and investigations need to be done in the future.

scholarly journals Enhanced Radar Scattering From Water Inclusions In Ice

1988 ◽  
Vol 34 (118) ◽  
pp. 293-296 ◽  
Author(s):  
J.L. Bamber
Keyword(s):  
Scattering Theory ◽  
Rayleigh Scattering ◽  
Mie Scattering ◽  
General Analysis ◽  
Plane Boundary ◽  
Scattered Power ◽  
Radar Scattering ◽  
Radio Echo Sounding ◽  
Polar Research Institute ◽  
Mie Scattering Theory

AbstractIt is believed that water-filled cavities on the scale of decimetres are present in a number of glaciers in Spitsbergen. The evidence for this hypothesis comes from airborne radio echo-sounding records collected by the Scott Polar Research Institute in 1983. The size of these cavities prevents the use of Rayleigh scattering theory and requires a more general analysis. Mie scattering theory is used to investigate the scattered power providing some unexpected results, the most significant of which is that for water bodies greater than approximately 0.25 m in radius the returned power from the volume illuminated is greater than that from a perfectly reflecting plane boundary.

Study of Oceanic Suspended Particles Density Detecting Technology Based on Mie Scattering Theory

2012 ◽  
Vol 192 ◽  
pp. 425-429
Author(s):  
Hong Lin ◽  
Xin Min Wang ◽  
Chuan Lin Zhou ◽  
Wei Zhong Li
Keyword(s):  
Scattering Theory ◽  
New Technology ◽  
Suspended Particles ◽  
Mie Scattering ◽  
Airborne Lidar ◽  
Optical Scattering ◽  
Laser Scattering ◽  
Scattering Ratio ◽  
Mie Scattering Theory ◽  
Scattering Signal

A new technology about ocean suspended particles density detecting by Mie scattering theory is proposed. This technology is based on analyzing and studying the transmission characteristics of the laser in the seawater. Based on Mie scattering theory, the optical scattering characteristics of oceanic suspended particles is researched, and a new method of calculating the scattering coefficient and backward scattering ratio is putted forward. By detecting the laser scattering signal under the seawater, the density information of ocean suspended particles can be gain and detect. A ocean suspended particles density detecting model based on airborne lidar system is firstly established through analyzing the absorbing and scattering characteristics of the suspended particles. By simulating and calculating, it is proved that the technology can detect and monitor the density of ocean suspended particles effectively, and therefore it can predict the density change of ocean suspended particles also.

scholarly journals Underwater Holographic Sensor for Plankton Studies In Situ Including Accompanying Measurements

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4863
Author(s):  
Victor Dyomin ◽  
Alexandra Davydova ◽  
Igor Polovtsev ◽  
Alexey Olshukov ◽  
Nikolay Kirillov ◽  
...  
Keyword(s):  
World Ocean ◽  
Field Tests ◽  
Field Measurements ◽  
Measuring Systems ◽  
Water Turbidity ◽  
Background Data ◽  
Average Size ◽  
Size Dispersion

The paper presents an underwater holographic sensor to study marine particles—a miniDHC digital holographic camera, which may be used as part of a hydrobiological probe for accompanying (background) measurements. The results of field measurements of plankton are given and interpreted, their verification is performed. Errors of measurements and classification of plankton particles are estimated. MiniDHC allows measurement of the following set of background data, which is confirmed by field tests: plankton concentration, average size and size dispersion of individuals, particle size distribution, including on major taxa, as well as water turbidity and suspension statistics. Version of constructing measuring systems based on modern carriers of operational oceanography for the purpose of ecological diagnostics of the world ocean using autochthonous plankton are discussed. The results of field measurements of plankton using miniDHC as part of a hydrobiological probe are presented and interpreted, and their verification is carried out. The results of comparing the data on the concentration of individual taxa obtained using miniDHC with the data obtained by the traditional method using plankton catching with a net showed a difference of no more than 23%. The article also contains recommendations for expanding the potential of miniDHC, its purpose indicators, and improving metrological characteristics.

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