pH sensor using Langmuir-Blodgett overlays on polished optical fibers
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Flannery, D.
James, Stephen W.
Tatam, Ralph P.
Ashwell, Geoffrey J.
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0146-9592
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Abstract
Evanescent coupling between a side-polished single-mode optical fiber and a single-mode, pH-sensitive Langmuir-Blodgett overlay is used to demonstrate an intrinsic fiber-optic pH sensor. The sensor shows a wavelength sensitivity of 18.8 ± 0.8 nm/pH and a transmission sensitivity of 9.7 ± 0.8 dB/pH when operating at 750 n