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An instrument used to measure the index of refraction of a substance in any one of several ways, such as measurement of the refraction produced by a prism, measurement of the critical angle, observation of an interference pattern produced by passing light through the substance, and measurement of the substance's dielectric constant.



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.

References in periodicals archive ?
It should be noted that the refractometric method is more sensitive than the latter.
of Technology, Sweden) offers an integrative view of the science and technology of a particular type of biosensor, those based on refractometric plasmonic detection, describing all the features of the type as a whole, but not all variations and examples.
[15.] Banerjee, A., "Enhanced refractometric optical sensing by using one-dimensional ternary photonic crystals," Progress In Electromagnetics Research, Vol.
Refractometric method for determining phenols in the oil shale products // Chemistry and technology of oil shale thermal processing products.
The evaluation of the absorbed formaldehyde by the 25 ml water was obtained from standard calibration curves derived from refractometric technique using Abbe refractometer.
L, dl- and 1-isomers can be distinguished optically by using refractometric techniques that determine the specific rotation and therefore the optical purity of the isomer.
Molecular concentration is measured using either refractometric methods (interference) or ultraviolet absorption.
Lewis et al., "Enhanced responsivity with skew ray excitation of reflection- and transmission-type refractometric sensors," Optics Letters, vol.
A previous study in racing pigeons (Columba livia) established normal urine osmolality for this species (6) but did not correlate the results with refractometric USG values.
Refractometric method was used to determine the moisture, or conversely the soluble solids in honey as previously described by the International Honey Commission [7].