S. Muto et al., OPTICAL HUMIDITY SENSOR USING FLUORESCENT PLASTIC FIBER AND ITS APPLICATION TO BREATHING-CONDITION MONITOR, JPN J A P 1, 33(10), 1994, pp. 6060-6064
The plastic fiber humidity sensor, the mechanism of which is based on
an ionization reaction between water vapor and the fluorescent dye-dop
ed polymer cladding, was studied. The conditions under which to obtain
the maximum sensitivity were derived from the theory and experimental
data. Under these conditions, the fluorescent plastic fiber could be
used as an excellent optical humidity sensor head with good linearity
over the wide humidity range. Due to its reproducibility and fast resp
onse property, its application to a breathing-condition monitor became
possible.