Aqueous Sucrose Concentration Measurement Based On Michelson Interferometer
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Date
2015-02
Authors
HONG KOK, TAN
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Abstract
Measurement of concentration for aqueous solution is fundamentally relied on the refractive index (RI) of the aqueous medium as a dominant factor. Understanding the nature of variation for RI is crucial for precise measurement of solution concentration. Due to the high precision level of RI (up to 5 decimal places) nowadays, a high sensitivity versatile instrument such as optical interferometer is required to enable accurate measurement. The main objective of this research work is to develop a non-destructive Michelson Interferometer (MI) based interferometry setup to measure the concentration level of aqueous sucrose samples and as well as investigate the correlation between RI and concentration level of the samples. In this research, quantitative analysis of 41 aqueous sucrose samples (including 0 %Brix clear filtered water) with different concentration level ranging from 0% to 50 %Brix are accomplished by allocating the aqueous samples in a cubic quartz cuvette to allow the transmission of laser pass through and produce interference fringes as a result of going through MI. Image result of the interference patterns generated are captured and processed with the help of image processing software. Red, green, blue (RGB) gray value obtained is used to calculate multiple minima (dark fringe) separations, maxima (bright fringe) thickness values, and as well as RGB profile analysis based on random pixel points. Independent analysis of low concentration samples segment and high concentration samples segment in respective order are available in the content. From the research, the minima separations and maxima thickness show fair regression response in R-squared (R2) value of 88.90% and 55.54% respectively. The findings from experiment depict good agreement with
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theoretical prediction and can be concluded with the RI response proportionally to aqueous solution concentration in linearly ascending order.
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Keywords
Aqueous Sucrose Concentration Measurement , Based On Michelson Interferometer