This article describes the design of an apparatus that allows the digital acquisition of polarimetric data from a Lippich polarimeter. This apparatus consists of a low-cost telecamera applied to the ocular of a double-field polarimeter and connected to a PC. The camera is able to reveal with high sensibility the difference in brightness in the two fields allowing more accurate analytical data to be obtained, without need for the analyser to be rotated. This apparatus allows the execution of either single observations or kinetics, because it is able to save previously obtained analytical data. Experimental tests of the apparatus were performed by measuring the rotation angle of solutions of (–)-adrenaline and by following the kinetics of the acid-catalyzed hydrolysis of sucrose.
Automatic Low-cost Data Acquisition from Old Polarimetric Instruments
ALIBRANDI, Giuseppe;D'ALIBERTI, Santi;VILLARI, Antonino Gaet.;
2005-01-01
Abstract
This article describes the design of an apparatus that allows the digital acquisition of polarimetric data from a Lippich polarimeter. This apparatus consists of a low-cost telecamera applied to the ocular of a double-field polarimeter and connected to a PC. The camera is able to reveal with high sensibility the difference in brightness in the two fields allowing more accurate analytical data to be obtained, without need for the analyser to be rotated. This apparatus allows the execution of either single observations or kinetics, because it is able to save previously obtained analytical data. Experimental tests of the apparatus were performed by measuring the rotation angle of solutions of (–)-adrenaline and by following the kinetics of the acid-catalyzed hydrolysis of sucrose.Pubblicazioni consigliate
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