ABSTRACTKnowledge of the optical properties (e.g. refractive index and extinction coefficient) of a liquid phase plays an important role especially in physics and chemistry. Various methods of liquid analysis have also gained increasing popularity in industry where they have been used for various purposes such as measurement of concentration, density measurements and identification of species. This paper reviews authors work of exploitation and development of optical reflectance spectroscopy, sometimes, at the demanding field of process liquids analysis. To this end a spectroscopic reflectometer has been designed and constructed. Specular as well as diffuse reflectance may be determined as a function either of angle of incidence or of the wavelength of incident light. In addition, the polarization of incident light can be varied allowing the device to operate in many measurement modes. Analysis techniques compatible with the use of the reflectometer, such as phase retrieval procedures, were introduced and tested. Information concerning the wavelength-dependent complex refractive indices of both transparent and opaque liquids was gathered across the UV-visible spectral range.
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