refractometer


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refractometer

 [re″frak-tom´ĕ-ter]
1. an instrument for measuring the refractive power of the eye.
2. an instrument for determining the indexes of refraction of various substances, particularly for determining the strength of lenses for spectacles.

re·frac·tom·e·ter

(rē'frak-tom'ĕ-ter),
An instrument for measuring the degree of refraction in translucent substances, especially the ocular media. See: refractive index.
[refraction + G. metron, measure]

re·frac·tom·e·ter

(rē'frak-tom'ĕ-tĕr)
An instrument for measuring the degree of refraction in translucent substances, especially the ocular media.
See also: refractive index
[refraction + G. metron, measure]

refractometer 

1. An instrument for measuring the refractive index of transparent objects. There exist several types: Abbé's refrac-tometer, which is based on the measurement of the critical angle at the interface between a sample and a prism of known index of refraction and uses white light whereas that of Pulfrich, which is based on the same principle as Abbé's, uses monochromatic light. As the refractive index of some materials is related to their water content, the handheld Atago CL-1 Soft lens Refractometer has been calibrated to provide a reading of the percentage of water content of soft contact lenses.
2. See optometer.
References in periodicals archive ?
Tour malines: Multiple indices on the refractometer: A further note.
A conversion equation was determined to translate specific gravity measured by using a reference (human-canine) refractometer scale to specific gravity values for Hispaniolan Amazon parrot urine.
The sample was diluted with 2 volumes of water, giving a reading of 1.029 by refractometer. Therefore, the correct SG was reported as 1.087 (i.e., 1 + 0.029 X 3).
Hemolymph samples were analyzed for THP at the pound using the refractometer, and 1 mL hemolymph was placed in SBS for fluorescence analysis.
Hanna HI 96801 Digital Refractometer: The HI 96801 Digital Refractometer is a rugged, portable, water-resistant device that's a little larger than some other portable units.
With the prism method, any optical goniometer (Burchard, 1998) or spectrometer may be employed as a refractometer, simply because the refraction angle of the prism edge ([omega]) and that between the incident and the deviated light rays ([delta]) is to be measured.
Here is what the portable refractometer is and how it works: It is a precision optical instrument, designed to measure the concentration of a solute such as sugar or salt in an aqueous solution.
In one institution, standard practice was to measure specific gravity using the refractometer. Reagent strips were used to measure urine pH and all other substances.
Particular new items to look for include hand-held spectrophotometers and spectrocolorimeters that can take sophisticated color measurement into hitherto inaccessible areas of the production floor; lower cost instruments, such as an on-line i-r spectrometer, noncontacting laser extensometers for testing elongation of fragile materials; and new instrument combinations for one-step analysis-- such as what's said to be the first GPC unit with viscometer and refractometer.
With standard gemmological testing, the material is easily recognizable by its strong carbonate birefringence blink on the refractometer. Also, the hydrostatic SG is 2.64-2.79, there is no fluorescence to UV radiation, and both malachite and azurite will effervesce when exposed to dilute hydrochloric acid.
Depending on the instrument type, application and traceability requirement, a choice can be made from a number of Certified Reference Materials offered by Bellingham + Stanley, a Xylem brand and UKAS accredited calibration laboratory, that may be used to verify almost any make of refractometer or polarimeter.
Labcell is adding the Bellingham+Stanley OPTi digital hand held refractometer to its range of instrumentation for the food and drink industries.