FIELD: physics; measurement.
SUBSTANCE: invention is meant for differentiating gas from liquid based on the much smaller refractive index of gas and can be used for monitoring purification of fluid samples in real time. Refractive index of liquid in a well is determined from the fraction R of light, reflected from the boundary surface of that fluid and a transparent small window with a known refractive index. In the preferred version the refractive index is measured at a specific wavelength of light, for which the fluid gives rise to optimum and not strong weakening. A connection can be used with a transmission spectrometre for correcting weakening into measurement of refractive index at three wavelengths on which monitoring is done. Design of a refractometre based on reflection can also be used as a disrupted reflection spectrometre at wavelengths corresponding to significant weakening.
EFFECT: possibility of uninterrupted measurement of refractive index and simplification of the design of the device.
16 cl, 13 dwg
