A New Fluorescence Sensor for Quantification of Atmospheric Humidity

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Abstract
A new fiber‐optic sensor (optrode) for humidity has been developed. The sensor utilizes a fluorescent dye entrapped within a perfluorinated ionomer matrix. The fluorescence intensity increases strongly and linearly with increasing watervapor partial pressure even though the lifetime of fluorescence is simultaneously lowered. The response time of the optrode is approximately 1s and the presence of has no detectable effect on the determination of humidity. Apparently, the immobilized fluorescent dye, rhodamine 6G, associates with water to form a complex with a higher absorptivity. The dependence of fluorescence lifetime on emission wavelength revealed the coexistence of multiple excited states for the water‐dye system.

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