Angle of deviation method

The modem refractive index detector is the result of considerable research initiated by Zaukelies and Frost [2] and Vandenheuval and Sipas [3] and is now continued largely by the research and development laboratories of the major instmment companies. A diagram of a simple refractive index detector that is based on the angle of deviation method measurement is shown in figure 1. 

The Refractive Index Detector Based on the Angle of Deviation Method of Measurement Courtesy of the Millipore Corporation... 

Since the original model of Tiselius there have been many papers published that describe different methods of refractive index monitoring. From these publications, four general methods emerge for measuring refractive index the angle of deviation method, the critical angle method, the Fresnel method and the Christiansen method. The theory behind each of these methods will now be discussed. 

Bubble of size of the order of tens of micrometers floating on the surfactant surface only little deviates from the spherical shape. This fact has been used in the method of diminishing bubble [128,129] which allows to measure the contact angle of the black film, the linear tension of the contact line film/meniscus and the coefficient of the gas permeability through the film. Fig. 2.24 presents the scheme of this device. 

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