Jpn. J. Appl. Phys. 33 (1994) pp. 6060-6064 |Next Article| |Table of Contents|
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Optical Humidity Sensor Using Fluorescent Plastic Fiber and Its Application to Breathing-Condition Monitor
Department of Electrical Engineering and Computer Science,
Faculty of Engineering,
Yamanashi University, 4-3-11 Takeda, Kofu 400
(Received June 18, 1994; accepted for publication July 16, 1994)
The plastic fiber humidity sensor, the mechanism of which is based
on an ionization reaction between water vapor and the fluorescent dye-doped
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 response property, its
application to a breathing-condition monitor became possible.
KEYWORDS:plastic optical fiber, fluorescent dye, chemical reaction, functional
cladding, humidity sensor, breath waveform
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