Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5007855 | Optics and Lasers in Engineering | 2017 | 9 Pages |
Abstract
A Stokes-Mueller matrix polarimetry system consisting of a polarization scanning generator (PSG) and a high-accuracy Stokes polarimeter is used to sense the glucose concentration in aqueous solutions with and without scattering effects, respectively. In the proposed system, an electro-optic (EO) modulator driven by a saw-tooth waveform voltage is used to perform full state of polarization (linear/circular) scanning, while a self-built Stokes polarimeter is used to obtain dynamic measurements of the output polarized light intensity. It is shown that the measured output Stokes vectors have an accuracy of 10â4, i.e., one order higher than that of existing commercial Stokes polarimeters. The experimental results show that the optical rotation angle varies linearly with the glucose concentration over the range of 0-0.5Â g/dl. Moreover, glucose sensing is successfully achieved at concentrations as low as 0.02Â g/dl with a resolution of 10â6Â deg/mm and an average deviation of 10â4Â deg. In general, the polarimetry system proposed in this study provides a fast and reliable method for measuring the Stokes vectors, and thus has significant potential for biological sensing applications.
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Engineering
Electrical and Electronic Engineering
Authors
Quoc-Hung Phan, Yu-Lung Lo,