Laboratory measurements of light scattering by tropical fresh water diatoms

Gogoi, Ankur; Buragohain, Alak Kumar; Choudhury, Arup; Ahmed, Gazi A.

doi:10.1016/j.jqsrt.2009.03.008

Cited by 31 publications

(13 citation statements)

References 25 publications

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“…As a footnote, in a recent paper describing multiple angle light scatter by bacterial spores, it was concluded that the measured signals did not correspond to modeling predictions using T-matrix to simulate a spore with three different particle shapes [58]. Gogoi et al reported that for complex particles like fresh water diatoms, multiple angle light scatter data did not correlate to Mie predictions [59]. Interestingly, in 1978, Latimer setting out to define "asphericity" of single particles, concluded that data reliability could be compromised by random particle orientation and irregularity of shapes [60].…”

Section: Bacterial Shape Analysismentioning

confidence: 99%

History of the Early Biodetection Development

2014

Integrated Analytical Systems

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Section: Bacterial Shape Analysismentioning

confidence: 99%

History of the Early Biodetection Development

2014

Integrated Analytical Systems

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“…Also, the incorporation of an array of sixteen photodetectors to the setup enabled the measurement of light scattering patterns from very low angles (~ 10 degrees) to very high angles (~ 170 degrees) within a very short interval of time, which is very important for the retrieval of refractive index, size dispersion and other morphological characteristics of the scatterer. Moreover the light scattering setup is designed to accommodate different sample holders including embedded samples [16,17], cuvette for hydrosols [18], nebulizer for aerosol spraying so that it can be used for the light scattering studies of different types of samples. Thus, the present scattering setup will be very useful for the in-situ measurement of light scattering properties and quantitative analysis of size distribution and refractive index of aerosols, hydrosols and embedded particulate matter.…”

Section: Resultsmentioning

confidence: 99%

Construction of a multidetector array incorporated laser-based scattering system for ultrafine TiO2 characterization

Gogoi

Choudhury

Stanciu

et al. 2009

J Opt

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A laser based light scattering system has been designed and fabricated for measuring the scattering properties of ultrafine TiO 2 particles as a function of scattering angle at the He-Ne laser wavelength 632.8 nm. The system essentially consists of an array of 16 highly sensitive static Si detectors (BPW34) which can measure scattered light signals from 10 degrees to 170 degrees in steps of 1 degree. The signals are interfaced to a high gain 16 channel preamplifier and a dedicated data acquisition system (Vinytics PCI-9812) for data analysis. The measured scattering properties of rutile (TiO 2 ) particles agree reasonably well with the theoretical results drawn from T-matrix calculations.

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“…A modified laser based light scattering setup was designed [12,13 ] and fabricated (as shown Figure 1). The present setup is a modification of the setup made earlier by the group [7,8] which was used to study the light scattering characteristics.…”

Section: Methodsmentioning

confidence: 99%

Size dependent optical characterization of semiconductor particle: CdS embedded in polymer matrix

2010

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We report the optical investigation and analysis of both nano-sized and micrometer size Cadmium Sulphide particles which is embedded in a transparent polyvinyl alcohol (PVOH) dielectric host material. A designed and fabricated laser based light scattering system using a He-Ne laser of wavelength 632.8nm was used for the measurement and study of the scattering properties of the particles as a function of the scattering angle at this wavelength. An attempt was made to experimentally determine the most significant elements of the Mueller scattering matrix using combinations of randomly and linearly polarized incident laser beam and subsequent analyzers in corresponding orientations. The analysis of the experimental data was done by the method of comparison with theoretically generated data. Novel computational technique, involving single scattering for spherical particles using Mie-theory, was developed and applied. The theoretical data was found to be in good agreement with the experimental data within an acceptable margin of error. The results have proved that the combination of the experimental setup and associated computational method is a highly efficient and reliable in-situ system for monitoring size growth of semiconductor particles in the laboratory.

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Laboratory measurements of light scattering by tropical fresh water diatoms

Cited by 31 publications

References 25 publications

History of the Early Biodetection Development

History of the Early Biodetection Development

Construction of a multidetector array incorporated laser-based scattering system for ultrafine TiO2 characterization

Size dependent optical characterization of semiconductor particle: CdS embedded in polymer matrix

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