New type of liquid refractometer

Abstract

Liquid refractometers are often used in the optical industry. Although there are some liquid refractometers available, such as, the Pulfrich refractometer,1 the Abbe refractometer,1 and the Hilger-Chance refractometer,1 all of them are based on the measurement of the critical angle or the deviation angle using a microscope or a telescope. The measuring process is tedious. Some other techniques for measuring the refractive index of a liquid include, for example, the interferometric method2,3 and the Brewster angle method.