초록 ▼

The instrument disclosed assists in determining the refractive index and absorption index, at different spectral frequencies, of a solid sample by illuminating the sample at various angles in incidence and measuring the corresponding reflected intensities at various spectral frequencies and polariza

The instrument disclosed assists in determining the refractive index and absorption index, at different spectral frequencies, of a solid sample by illuminating the sample at various angles in incidence and measuring the corresponding reflected intensities at various spectral frequencies and polarization angles. The ratio of the intensity of the reflected light for parallel polarized light to that for perpendicular polarized light at two different angles of incidence can be used to determine the optical constants of the sample. The invention involves an apparatus for facilitating the utilization of a wide variety of angles of incidence. The light source and polarizing element are positioned on an outer platform; the sample is positioned on an inner platform. The two platforms rotate about a common axis and cooperate in their rotation such that the sample is rotated one degree for every two degrees of rotation of the light source. This maintains the impingement of the reflected light upon the detector for any angle of incidence without moving or adjusting the detector which allows a continuous change in the angle of incidence.

대표청구항 ▼

An instrument for measuring the intensity of polarized light reflected from a surface, the combination comprising: (a) a sample surface; (b) a reference surface; (c) multiple light sources; (d) light selection and chopping means for selecting the light from one of said multiple light sources, choppi

An instrument for measuring the intensity of polarized light reflected from a surface, the combination comprising: (a) a sample surface; (b) a reference surface; (c) multiple light sources; (d) light selection and chopping means for selecting the light from one of said multiple light sources, chopping the light signal at a predetermined frequency, and focusing the light onto said sample surface; (e) continuously rotating light polarizing means positioned between said sample surface and said light selection and chopping means and wherein said continuously rotating light polarizing means continuously changes the plane of polarization of the light from 0°to 360°; (f) detection means for selectively sensing and analyzing light reflected from said sample surface and said reference surface; (g) sample spinner means connected to said light selection and chopping means and positioned between said light selection and chopping means and said detection means for supporting said sample surface and said reference surface; and (h) aligning means for automatically aligning said light selection and chopping means, said sample spinner means, and said detection means while the angle of incidence is changed continuously or otherwise, so that the light from said light selection and chopping means upon striking said sample surface will reflect from said sample surface and impinge on said detection means.