Physics – Optics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apopt..15.1212w&link_type=abstract
Applied Optics, vol. 15, May 1976, p. 1212-1217.
Physics
Optics
2
Anisotropic Media, Light Scattering, Microwave Scattering, Optical Polarization, Particle Interactions, Refractivity, Analog Simulation, Electromagnetic Absorption, Forward Scattering, Graphite, Interstellar Extinction, Mie Scattering, Spheres
Scientific paper
Experimental scattering results using a microwave analog technique are described. Artificially constructed axially symmetric spheres with a graphite-like fine-layered composite structure and anisotropic refractive indices were employed to aid high-precision measurements of forward scattering under stable conditions (temperature, physical dimensions, electronic conditions) and to facilitate studies of the extinction and polarization of light by graphite particles in interstellar space. A theoretical approximation utilizing Mie theory for spheres with suitable orientation-dependent refractive indices is applied to account for changes in the complex forward-scattering amplitudes and phase in response to target orientation. The methods are extended to the full range of scattering angles, from the forward direction continuously to about 165 deg and at 180 deg. Agreement between experiment and prediction is close when the symmetry axis is parallel to the polarization.
Greenberg Mayo J.
Wang R. T.
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