Light Scattering by Nonspherical Particles: A Laboratory Study

Coletti, Alex

doi:10.1080/02786828408958992

Cited by 18 publications

(7 citation statements)

References 19 publications

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“…This may indicate that light reflected and refracted on an irregular surface leads to angular distributions which differ from those of ideal spheres (see Figure 6). Angular distributions of scattered laser light measured recently by Coletti [9] on collections of isometric nonspherical particles agree with these general statements.…”

Section: Biittner [S] Measured Particles Of Quartz and Limestone With Asupporting

confidence: 85%

Response of Single‐Particle Optical Counters to Particles of irregular shape

Gebhart

1991

Part & Part Syst Charact

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The response of optical particle counters to nonspherical particles is analyzed theoretically and on the basis of experimental results. Theoretical approximations valid for particle diameters d Q A and d 9 1 (where d is the wavelength of light) are used to derive some general predictions about the influence of the particle shape on light scattering. These predictions are compared with experiments on six optical particle counters using nonspherical particles. The instruments differ in the kind of il-lumination (laser or incandescent light), the mean scattering angle and the receiver aperture. When the particle size is smaller than the wavelength the light-scattering diameter of a nonspherical particle comes very close to its volume-equivalent diameter. For irregularly shaped particles larger than the wavelength better conditions than giving a "projected area" response cannot be achieved with an optical arrangement for single-particle detection.

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Section: Biittner [S] Measured Particles Of Quartz and Limestone With Asupporting

confidence: 85%

Response of Single‐Particle Optical Counters to Particles of irregular shape

Gebhart

1991

Part & Part Syst Charact

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“…43 In fact, sensitivity to particle shape is normally achieved through measurements of the angular distribution of the scattered light, and its dependence on the polarization of the incident radiation. 44 In the following discussion, we assume that the spherical Mie scattering calculations, when averaged over the particle size distribution, are applicable to the aerosols generated using the technique described herein.…”

Section: Mie Scattering Calculationsmentioning

confidence: 99%

Infrared spectroscopy and Mie scattering of acetylene aerosols formed in a low temperature diffusion cell

Dunder

Miller

1990

The Journal of Chemical Physics

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Articles you may be interested inA new, low temperature long-pass cell for mid-infrared to terahertz spectroscopy and synchrotron radiation use Rev. Sci. Instrum. 84, 093101 (2013); 10.1063/1.4819066Mie scattering enhanced near-infrared light response of thin-film silicon solar cells Appl. Phys. Lett. 97, 063507 (2010);A method is described for forming and spectroscopically characterizing cryogenic aerosols formed in a low temperature gas cell. By adjusting the cell pressure, gas composition and flow rate, the size distribution of aerosol particles can be varied over a wide range. The combination of pressure and flow rate determine the residence time of the aerosols in the cell and hence the time available for the particles to grow. FfIR spectroscopy, over the range from 600 to 6000 em -I , is used to characterize the aerosols. The particle size distribution can be varied so that, at one extreme, the spectra show only absorption features associated with the infrared active vibrational bands and, at the other, they display both absorption and Mie scattering. In the latter case, Mie scattering theory is used to obtain semiquantitative aerosol size distributions, which can be understood in terms of the interplay between nucleation and condensation. In the case of acetylene aerosols, the infrared spectra suggest that the particles exist in the high temperature cubic phase of the solid.

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“…In spite of the variety of the scattering patterns for a variety of the particle shapes, there may be some possibility of describing its general features using a semi-empirical fitting as in Pollack and Cuzzi (1980). Basically the phase functions of nonspherical particles are less dependent on the scattering angle than that of Mie particles (Coletti, 1984). The degree of linear polarization also tends to become smaller than that of Mie particles.…”

Section: Introductionmentioning

confidence: 99%

“…Especially there are no investigations of the phase function of yellow sand particles in the North-Eastern Asia to our knowledge . The scattering property of each nonspherical particle depends on its shape as shown by a number of measurements of light scattering by nonspherical particles in laboratory conditions (e.g., Holland and Gagne, 1970;Pinnick et al, 1976;Chylek et al, 1977;Zerull, 1976;Schuerman et al, 1981;Coletti, 1984). For example, the asymmetry factor can increase or decrease as compared with the equalvolume sphere, depending on the particle shape and size (Mugnai and Wiscombe, 1986).…”

Section: Introductionmentioning

confidence: 99%

Aerosol Optical Characteristics in the Yellow Sand Events Observed in May, 1982 at Nagasaki-Part II Models

Nakajima

Tanaka

Yamano

et al. 1989

Journal of the Meteorological Society of Japan

168

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Phase functions of yellow sand particles were measured by a polar nephelometer during 24 April-11 May, 1982 at Nagasaki, Japan. They suggested a strong nonsphericity of the particles, which can be reconstructed by the semi-empirical theory of Pollack and Cuzzi or by Mie particles with large fictitious absorption. Spectral extinction cross section, single scattering albedo, asymmetry factor and backscattering phase function were estimated using the volume spectra retrieved from data of several instruments including the polar nephelometer data. Volume loading of yellow sand particles at the observation site was estimated as 666l/km2 at the maximum stage of the yellow sand event of 4-6 May and 183l/km2 for the secondary maximum of 8 May. Using two estimates of the absorption index (0.01 and a model variable with wavelengths), these values show that solar radiative heating from 0.08 to 0.4*/day can be expected in the atmosphere over considerably wide area in one yellow sand event.

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Light Scattering by Nonspherical Particles: A Laboratory Study

Cited by 18 publications

References 19 publications

Response of Single‐Particle Optical Counters to Particles of irregular shape

Response of Single‐Particle Optical Counters to Particles of irregular shape

Infrared spectroscopy and Mie scattering of acetylene aerosols formed in a low temperature diffusion cell

Aerosol Optical Characteristics in the Yellow Sand Events Observed in May, 1982 at Nagasaki-Part II Models

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