Polarimeter

Details Polarimeter Polarimeter

1979-03-26

1981-12-22

Punter, William H.

Optics: measuring and testing

By polarized light examination

With polariscopes

350377, 350393, 350403, 350407, 356365, 356369, G01N 2121, G01U 404, G02F 101, G02F 109

Patent

active

043068090

ABSTRACT:
To measure characteristics such as density and particle-size distributions of a medium that interacts with light, a polarimeter simultaneously develops all 16 elements of the Mueller matrix by modulating polarized monochromatic light with a quarter-wave retarder operating at a predetermined frequency before transmitting it to the medium and then modulating the light leaving the medium with another quarter-wave retarder which operates at a frequency five times that of the predetermined frequency of modulation of the light transmitted to the medium. The light is electrically detected and provides a signal which may, by Fourier analysis, be broken into 25 terms. The coefficients of those 25 terms, by relatively easy calculations, provide the 16 elements of the Mueller matrix. An electrical element is provided for optically simulating the rotation of a quarter-wave retarder.

REFERENCES:
patent: 2780958 (1957-02-01), Wiley
patent: 3558214 (1971-01-01), De Lang et al.
patent: 3558215 (1971-01-01), De Lang et al.
patent: 3612688 (1971-10-01), Liskowitz
patent: 3985447 (1976-10-01), Aspnes
Hauge et al., "A Rotating-Compensator Fourier Ellipsometer" Optics Communications, 8-1975, pp. 431-437.
Aspnes et al., "Rotating-Compensator/Analyzer Fixed-Analyzer Ellipsometer: Analysis & Comparison to Other Automatic Ellipsometers", Jr. Optical Soc. America, 9-1976, pp. 949-954.
Azzam, R. M. A., "Photopolarimetric Measurement of the Mueller Matrix by Fourier Analysis of a Single Detected Signal", Optics Letters, 6-1978, pp. 148-150.
Thompson et al., "Polarization-Dependent Ligh-Scattering Measurements Using an Electro-Optical Modulator-Based Instrument" Optical Polarimetry, vol. 112 1977, pp. 152-157.
Azzam, R. M. A. "Simulation of Mechanical Rotation by Optical Rotation: Application to the Design of a NE Photopolarimeter", J. Opt. Soc. A. vol. 68, 4-1978, pp. 518-521.
Azzam, R. M. A. "Photopolarimeter Using Two Modulated Optical Rotators", Optics Letters, 11-1977, pp. 181-183.
Azzam, R. M. A., "Fourier Photoellipsometers & Photopolarimeters Based on Modulated Optical Rotation", Optical Polarimetry vol. 112, 1977 pp. 54-57.

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