A renewable-reagent fiber optic chemical sensor has been developed for measuring the partial pressure of carbon dioxide in ocean waters. A colorimetric pH indicator is delivered at a controlled flow rate through capillary tubing to the fiber tips. The fibers measure the color changes induced by CO$-2$/ diffusion across a gas-permeable silicone membrane. Multi-wavelength detection is used to correct for system drift. Factors affecting the sensitivity and stability of the response are discussed.
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