Method and device for determination of the albedo of a particle

Details Method and device for determination of the albedo of a particle Method and device for determination of the albedo of a particle

1996-04-26

1998-02-03

Font, Frank G.

Optics: measuring and testing

Of light reflection

With diffusion

356236, G01N 2155, G01J 104

Patent

active

057150656

ABSTRACT:
In order to provide a method and device for determination of the albedo or light absorption of a particle of random form, it is proposed that a particle is electrostatically charged and is positioned contact-free in an Ulbricht sphere by means of an electric field; that the particle thus positioned is illuminated with a measuring light beam passing through the Ulbricht sphere with defined intensity, defined beam cross-section and defined intensity distribution over this; that the intensity of the solely particle-based diffuse radiation in the Ulbricht sphere is measured by means of a sensor; that the cross-sectional area of the particle illuminated by the measuring light beam is determined; that the intensity of the solely reference particle-based diffuse radiation is measured in the same manner with a reference particle with known albedo; and that the albedo of the particle is determined from the ratio of the intensities of the particle-based and reference particle-based diffuse radiation taking into account the cross-sectional area of the particle illuminated by the measuring light beam and the cross-sectional area of the reference particle.

REFERENCES:
patent: 4575252 (1986-03-01), Akiyama

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