Brewster angle refractometer

Details Brewster angle refractometer Brewster angle refractometer

1994-09-19

1996-11-05

Pham, Hoa Q.

Optics: measuring and testing

Refraction testing

356 30, 356369, G01N 2141

Patent

active

055723144

ABSTRACT:
A Brewster angle refractometer, based on the principal that reflectivity of light polarized parallel to the plane of incidence is minimized at the Brewster angle, is used to determine the refractive index of a material. The refractometer has a precision mechanical drive arrangement for precisely determining the refractive index over a range of 1.4 to 3.0, with an accuracy of at least .+-.0.02.

REFERENCES:
patent: 3751162 (1973-08-01), Long
patent: 3975097 (1976-08-01), Minto
patent: 4012141 (1977-03-01), Hanneman
patent: 4179190 (1979-12-01), Friedman et al.
patent: 4210401 (1980-07-01), Batten
patent: 4249824 (1981-02-01), Wiederrich et al.
patent: 4368982 (1983-01-01), Van Arnam et al.
Read, P. G., "An Experimental Brewster-Angle Refractometer," J. Gemm. 16:537-541, 1979.
Read, P. G., "Further Development of the Brewster-Angle Refractometer," J. Gemm. 21:36-39, 1988.
Yu, R. M., "The Brewster Angle Refractometer," Gems and Gemology, 245-247, Winter, 1979.

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