Method for measuring refractive index of medium to be measured over optical window, involves guiding light incoming from light source on structure that has wavelength of light, where structure is formed from upper surface of optical window

摘要

The method involves guiding the light incoming from a light source (8) on a structure that has a wavelength of light, where the structure is formed from an upper surface of an optical window (1). The light is guided in the desired angles to the boundary surface between the optical window and the medium to be measured. The light reflected from the boundary surface between the optical window and the medium to be measured is guided on another structure, with which the light is guided for analysis. An independent claim is included for a refractometer for measuring a refractive index on a liquid.