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Application of Fresnel diffraction from the edge of a transparent plate to measurement of glucose concentration

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Abstract

We present a new method for measuring the solution concentration based on laser light diffraction from the edge of a glass plate immersed in the solution. It is shown experimentally that the visibility of diffraction fringes is varied periodically with solution concentration and the period is related to light wavelength and thickness of the glass plate. There are intervals of concentrations in which the visibility-concentration curve is very near to linear. By choosing a suitable glass plate, one can change the extent of measurable concentrations and the resolution of the method. Using a 1 mm thick glass plate, we obtained a resolution of$7.67 \times {10^{- 6}}\;{\rm g}/{\rm cc}$ in the detection of glucose concentration. The presented method is accurate and much simpler than other methods for measuring the solution concentration.

© 2021 Optical Society of America

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Supplementary Material (2)

NameDescription
Visualization 1       recorded diffraction patterns at 219 different glucose concentration glass thickness = 180 microns. This movie built with ImageJ software.
Visualization 2       recorded diffraction patterns at 216 different glucose concentration glass thickness = 1 mm. This movie built with ImageJ software.

Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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