Scattering of a Gaussian Beam by a Sphere Using a Bromwich Formulation: Case of an arbitrary location

Gouesbet, G.; Maheu, B.; Gréhan, Gérard

doi:10.1002/ppsc.19880050102

Cited by 18 publications

(2 citation statements)

References 16 publications

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“…Mie's generalised theory is particularly appropriate for calculating the response of modern instruments using laser beams. [7][8][9][10] The theory makes it possible to calculate the scattered light intensity all around an illuminated particle with respect to particle diameter D, particle refraction index n and the wavelength of scattered light l. An example of angular scattered light distribution 11 for l ¼ 960 nm and a spherical particle with D ¼ 3 mm and n ¼ 1.5 À 0i is reported in Fig. 2.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Thoracic and respirable fractions. Thoracic and respirable health related aerosol fractions are calculated from the OPC data using eqn (7) and ( 8) respectively. This calculation yields C T ¼ 11.0 mg m À3 and C R ¼ 3.8 mg m À3 for day one and C T ¼ 2.8 mg m À3 and C R ¼ 1.0 mg m À3 for day two.…”

Section: Calculation Of Aerosol Mass Concentrations From Opc Datamentioning

confidence: 99%

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Workplace aerosol mass concentration measurement using optical particle counters

et al. 2012

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Direct-reading aerosol measurement usually uses the optical properties of airborne particles to detect and measure particle concentration. In the case of occupational hygiene, mass concentration measurement is often required. Two aerosol monitoring methods are based on the principle of light scattering: optical particle counting (OPC) and photometry. The former analyses the light scattered by a single particle, the latter by a cloud of particles. Both methods need calibration to transform the quantity of scattered light detected into particle concentration. Photometers are simpler to use and can be directly calibrated to measure mass concentration. However, their response varies not only with aerosol concentration but also with particle size distribution, which frequently contributes to biased measurement. Optical particle counters directly measure the particle number concentration and particle size that allows assessment of the particle mass provided the particles are spherical and of known density. An integrating algorithm is used to calculate the mass concentration of any conventional health-related aerosol fraction. The concentrations calculated thus have been compared with simultaneous measurements by conventional gravimetric sampling to check the possibility of field OPC calibration with real workplace aerosols with a view to further monitoring particle mass concentration. Aerosol concentrations were measured in the food industry using the OPC GRIMM® 1.108 and the CIP 10-Inhalable and CIP 10-Respirable (ARELCO®) aerosol samplers while meat sausages were being brushed and coated with calcium carbonate. Previously, the original OPC inlet had been adapted to sample inhalable aerosol. A mixed aerosol of calcium carbonate and fungi spores was present in the workplace. The OPC particle-size distribution and an estimated average particle density of both aerosol components were used to calculate the mass concentration. The inhalable and respirable aerosol fractions calculated from the OPC data are closely correlated with the results of the particle size-selective sampling using the CIP 10. Furthermore, the OPC data allow calculation of the thoracic fraction of workplace aerosol (not measured by sampling), which is interesting in the presence of allergenic particles like fungi spores. The results also show that the modified COP inlet adequately samples inhalable aerosol in the range of workplace particle-size distribution.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Calculation Of Aerosol Mass Concentrations From Opc Datamentioning

confidence: 99%

Workplace aerosol mass concentration measurement using optical particle counters

et al. 2012

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Generalized lorenz‐mie theory and applications

Gouesbet

1994

Part & Part Syst Charact

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Many optical sizing techniques rely on particle/laser interactions. The classical Lorenz-Mie theory describing sphere/plane wave interactions is therefore misleading when designing instruments and processing data when the particle size is not small enough with respect to beam diameters. In such cases the use of the generalized Lorenz-Mie theory is required. After summarizing essential features of the generalized Lorenz-Mie theory for sphere/arbitrary wave interactions, this paper describes applications of the theory with some emphasis on the analysis of phase-Doppler anemometers.

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Elastic Light Scattering

Davis

Schweiger

2002

The Airborne Microparticle

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Scattering of a Gaussian Beam by a Sphere Using a Bromwich Formulation: Case of an arbitrary location

Cited by 18 publications

References 16 publications

Workplace aerosol mass concentration measurement using optical particle counters

Workplace aerosol mass concentration measurement using optical particle counters

Generalized lorenz‐mie theory and applications

Elastic Light Scattering

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