We demonstrate an intrinsic biochemical concentration sensor based on a polymer optical fiber Bragg grating. The water content absorbed by the polymer fiber from a surrounding solution depends on the concentration of the solution because of the osmotic effect. The variation of water content in the fiber causes a change in the fiber dimensions and a variation in refractive index and, therefore, a shift in the Bragg wavelength. Saline solutions with concentration from 0% to 22% were used to demonstrate the sensing principle, resulting in a total wavelength shift of 0.9 nm, allowing high-resolution concentration measurements to be realized.
Bibliographical note© 2012 Optical Society of America
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Zhang, W., Webb, D., & Peng, G-D. (2012). Polymer optical fiber Bragg grating acting as an intrinsic biochemical concentration sensor. Optics Letters, 37(8), 1370-1372. https://doi.org/10.1364/OL.37.001370