Hanna Digital Refractometers • Automatic Temperature Compensation · For exceptionally accurate measurements • Easy measurement · Place a few drops of the sample in the well and press the READ key • BEPS · (Battery Error Prevention System) alerts the user in the event that low battery power could adverselyaffect readings • IP65 water protection · Built to perform under harsh laboratory and field conditions • Single-point calibration · Calibrate with distilled or deionized water • Small sample size · Sample size can be as small as 2 metric drops • Stainless steel sample well · Easy to clean and corrosion-resistant • ABS thermoplastic casing • Startup · When powered on, the meter displays battery life and the set measurement units • Unit selection · Pressing the RANGE key quickly cycles through the units of measurement (if applicable) Refractive Index Refractive Index is an optical characteristic of a substance and the dissolved particles in it. The refractive index of a substance is strongly influenced by temperature and the wavelength of light used to measure it. Therefore, care must be taken to control or compensate for temperature differences and wavelength. The refractive index measurements are usually reported at a reference temperature of 20°C (68°F), which is considered to be room temperature. Refractive index is defined as the ratio of the speed of light in a vacuum to the speed of light in a substance. A result of this property is that light will “bend,” or change direction, when it travels through a substance with a different refractive index. This is called refraction. When passing from a material with a higher to lower refractive index, there is a critical angle at which an incoming beam of light can no longer refract, but will instead be reflected off the interface between the two substances. This is called total internal reflection. The critical angle can be used to easily calculate the refractive index according to the equation: sin (Θcritical) = n2 / n1 Where n2 is the refractive index of the lowerdensity medium; n1 is the refractive index of the higher-density medium. A digital refractometer uses an LED to pass light through a prism in contact with the sample. An image sensor determines the critical angle at which the light is no longer refracted through the sample. Specialized algorithms then apply temperature compensation to the measurement and convert the refractive index to the specified parameter. 13 Refractometers 13.2 | www.hannainst.com introduction
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