Method and device for measuring the refractive index of liquids and gases

In order to measure the refractive index of liquids or gases, the substance is put between two light-transmitting plates which are arranged parallel to one another and whose spacing is varied in a defined fashion during the measurement. Reflection of light at the interfaces produces interference, an...

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Bibliographic Details
Main Authors MAECHLER,MEINRAD, SCHLEMMER,HARRY,.DR
Format Patent
LanguageEnglish
German
Published 07.06.1984
Subjects
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Summary:In order to measure the refractive index of liquids or gases, the substance is put between two light-transmitting plates which are arranged parallel to one another and whose spacing is varied in a defined fashion during the measurement. Reflection of light at the interfaces produces interference, and during the variation of the plate separation the number of the interference maxima and/or minima (orders) passing through is measured. Given a known variation in the plate separation, the refractive index can be determined therefrom. Illumination is done by white light in order to determine the spectral variation of the refractive index (dispersion), and the number of orders passing through is determined using a diode row spectrometer for numerous wavelengths.
Bibliography:Application Number: DE19823244783