Improved fiber optic sensor for salt concentration based on polymer swelling

Mingqi Bai; William Rudolf Seitz

doi:10.1117/12.143546

30 April 1993 Improved fiber optic sensor for salt concentration based on polymer swelling

Mingqi Bai, William Rudolf Seitz

Proceedings Volume 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV; (1993) https://doi.org/10.1117/12.143546
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

An improved design for fiber optic chemical sensors based on polymer swelling is applied to the detection of changes in electrolyte concentration. In this design the polymer sensing element is isolated from the fiber optics by a rubber diaphragm glued to a reflecting piece of aluminum. Changes in polymer size move the diaphragm, changing the intensity of light reflected into an optical fiber. The sensor design allows the user to adjust the distance between the optical fibers and the reflecting surface so that maximum sensitivity can be achieved. The new design is demonstrated using a bead of crosslinked strongly basic anion exchange resin as a sensing element to detect changes in electrolyte concentration.

Citation Download Citation

Mingqi Bai and William Rudolf Seitz "Improved fiber optic sensor for salt concentration based on polymer swelling", Proc. SPIE 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV, (30 April 1993); https://doi.org/10.1117/12.143546

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