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The paper is focused on measurement techniques of gradient-index elements particularly useful for slightly inhomogeneous glasses from small laboratory melts. A construction of the measurement cuvette and dependence of the refractive index of an immersion liquid on its parameters is discussed. The dependence of the refractive index of ?-bromonaphtalene on temperature for ? = 0.6328 žm is described...
As automatic fringe analysis is used to measure the spectral dispersion of birefringence of cylindrical textile fibers. The approach presented is based on the optical Fourier transform microscopy of birefringent fibers. The pattern of the optical Fourier transform observed in a polarizing microscope is processed automatically to measure the radius of interference dark fringes as a function of light...
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