Refractometer(redirected from refractionometer)
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an instrument for measuring the refractive index of a substance. There exist types for solids, liquids, and gases. A distinction is made between laboratory and industrial refractometers. The principles of the operation of laboratory refractometers are discussed in the article REFRACTOMETRY. Such refractometers are used for analyses where the refractive index and the dispersion (the dependence of the refractive index on the wavelength of the radiation) of a substance are measured on a noncontinuous basis. Industrial refractometers are designed to record the dynamics of processes continuously and automatically. Refractometers can be incorporated into automatic process control systems.