The solution takes the form of an infinite series of spherical multipole partial waves. It is named after Gustav Mie. Bu sayfanın çevirisini yap Chapter 3. Particle-light interaction.

Matter is composed of discrete electric charges such as electrons and protons.

When light is incident on a particle, these charges are set . Interests range from areas in physics problems involving interstellar dust, near-field optics and plasmonics to engineering subjects like optical particle characterisation. Scattering Take – Duration: 1:22:35. In particular, the particle size r should be ~0. Laser diffraction is a . For this, the correspondence relationship between particle size and light intensity distribution pattern must be known in advance.

Mie approx to calculate . Sphere diameter, microns.

Wavelength in Vacuum, microns. Index of Refraction in Medium. Concentration, spheres per cubic . With laser diffraction, particle size is specified based on light intensity distribution patterns.

Initially, particle sizing by laser diffraction was limited to the use of the Fraunhofer diffraction theory. Today, laser diffraction analyzers go beyond simple diffraction effects. It begins with an overview of current theories, computational methods, experimental techniques, and applications of optics of small particles.

There is also some biographic information on Gustav Mie, who published his famous paper on the . In this chapter, the fundamental principles used to study light scattering by particles are introduced and briefly explained. We will discuss shortly this scheme following the presentation as given by C. Illumination of an obstacle by an electromagnetic wave excites electric charges in the obstacle to oscillate due to interaction with the electric field of the incident wave. The oscillating charge radiates. This theory is based on the method of separation of variables and . Through laser diffraction measurements, one obtains information about particle size distribution through measurements of scattering intensity as a function of the scattering angle and the wavelength and polarization of light based on applicable scattering models.

This is an absolute method without the need . Analytic equations are developed for the single- scattering properties of a spherical particle embedded in an absorbing medium, which include absorption, scattering , extinction efficiencies, the scattering phase function, and the asymmetry factor. We derive absorption and scattering efficiencies by using the near field at the .