The enhanced differential refractometer and measurement method for measuring the refractive index differential

摘要

PROBLEM TO BE SOLVED: To disclose an upgraded differential refractometer that incorporates a photodetector array.;SOLUTION: In this measuring method, a photo-array is used to provide baseline for measuring of differential refractive index by combining measuring sensitivity which conventionally has not been achieved with measuring range parallel to it. Within an achievable and wide dynamic range, detector configuration provides equal sensitivity regardless of refraction within the limit. The transmitted light beam is controlled so as to bring about spatial fluctuation of luminous intensity in the array, thereby accuracy in measurement of its displacement will be enhanced. Consequently, accuracy in the calculation of reported differential refractive index and differential refractive index increment dn/dc will also be enhanced. By incorporating the photodetector array into the flow cell configuration, as shown in the example, a very high sensitivity detector can be obtained, and the quantities of samples far smaller than those for the conventional differential refractometers are required.;COPYRIGHT: (C)2006,JPO&NCIPI