Apparatus for the continuous measurement of the density of a liq

Device for producing a light signal corresponding to the refract

Double optical probe device for the determination of the refract

Fiber optic refractometer

Fiber optic refractometer

Fluid composition sensor using reflected or refracted light moni

Measuring the refractive index of liquid

Method and apparatus for determining composition of fuel mixture

Method and apparatus for optically discriminating between the ph

Method of determining the refractive index of a substance and ap

Method of monitoring solidification of a liquid composition

Methods and devices for measuring the specific gravity of liquid

Multi-probe system for measuring bubble characteristics gas hold

Optical sensor

Optimal length for refractive index sensors

Refractive index detector

Refractive index of a liquid referred to a predetermined tempera

Refractive-index responsive light-signal system

Refractometer

Refractometer for fluids