Optofluidic prism refractometer

摘要

This paper describes a simple method of measuring refractive indices of liquids with a small hollow prism. When a He-Ne laser beam is sent to the liquid filled prism it is angularly deviated or deflected. If different liquids are injected in the prism, one at a time, the angular position of the emerging beam changes. These angular positions are detected by an optical fiber that samples a small area of the Gaussian beam cross section. A calibration curve relating intensity as a function of the liquid refractive index is obtained.