Abstract
THE accompanying diagram shows the essential parts of a refractometer using the principle of phase contrast, which is new for this class of instrument. It gives relative measurements, like most of the applications of the Jamin and the Rayleigh refractometers depending on interference. The liquid or gas to be measured is enclosed in the central horizontal cell C about 1 mm. in height, the reference liquid or gas filling the upper and lower portions. The plane-parallel frame forming the middle of the cell, and made of glass, plastic or stainless steel with its plane sides lapped, is made tightly adherent to the two highly polished plano-convex lenses of selected homogeneity.
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References
Françon, M., and Nomarski, G., C.R. Acad. Sci., Paris, 230, 1392 (1950).
Ingelstam, E., Ark. Fys., 3, No. 2 (1951).
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Ingelstam, E., Colloque intern. sur le contraste de phase et le contraste par interférence, Paris, May 1951 (in the press).
See, for example, Candler, C., “Modern Interferometers” (London, 1951).
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INGELSTAM, E. A Highly Sensitive Phase-Contrast Refractometer for Liquids and Gases. Nature 168, 960 (1951). https://doi.org/10.1038/168960a0
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DOI: https://doi.org/10.1038/168960a0
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