A new polarization‐modulated light scattering instrument

A new light scattering instrument is described for measuring, as a function of scattering angle, the elements of the matrix describing light scattered from small particle systems. The instrument uses a piezo‐optical birefringence modulator to modulate the polarization state of the incident light beam, and uses lock‐in amplifier detection of the scattered light. The first and second harmonics of the modulation frequency are used with various combinations of filters and orientations to give the separate matrix elements. A treatment of a simple scattering experiment by means of Mueller calculus is carried through to illustrate the interactions of the light with the scattering system and with the various components of the measuring instrument. Evaluation of the instrumental performance is shown through measurements on two systems of monodisperse polystyrene spheres of average radius 550 and 3940 A, compared with Mie calculations. Further measurements on sulfur colloids are presented, and suggestions of the va...

[1]  F. Perrin.  Polarization of Light Scattered by Isotropic Opalescent Media , 1942 .

[2]  V K LA MER,et al.  The determination of the particle size of monodispersed systems by the scattering of light. , 1947, Journal of the American Chemical Society.

[3]  James C. Kemp,et al.  Piezo-Optical Birefringence Modulators: New Use for a Long-Known Effect , 1969 .

[4]  M. Kerker,et al.  Particle size distribution of colloidal suspensions by light scattering based upon single particle counts—polystyrene latex , 1973 .

[5]  A. F. Stevenson,et al.  Theoretical Investigations on the Light Scattering of Colloidal Spheres. XI. Determination of Size Distribution Curves from Spectra of the Scattering Ratio or from Depolarization Spectra , 1961 .

[6]  G. Mie.  Beiträge zur Optik trüber Medien, speziell kolloidaler Metallösungen , 1908 .

[7]  D. Deirmendjian.  Electromagnetic scattering on spherical polydispersions , 1969 .

[8]  S. Jasperson,et al.  An improved method for high reflectivity ellipsometry based on a new polarization modulation technique [Rev. Sci. Instrum. 40, 95 (1969)] (Errata) , 1969 .

[9]  W. Dandliker.  Light Scattering Studies of a Polystyrene Latex1a , 1950 .

[10]  C. Macosko,et al.  Latex particle size analysis: I. Flow ultramicroscopy , 1969 .

[11]  J. Kratohvil,et al.  Calibration of light-scattering instruments. III. Absolute angular intensity measurements on mie scatterers☆ , 1965 .

[12]  A. C. Holland,et al.  The scattering of polarized light by polydisperse systems of irregular particles. , 1970, Applied optics.

[13]  M. J. Walker.  Matrix Calculus and the Stokes Parameters of Polarized Radiation , 1954 .

[14]  M. Kerker,et al.  Particle Size Distribution in Sulfur Hydrosols by Polarimetric Analysis of Scattered Light , 1950 .