Abstract
An optimized study of biconical tapered multi-mode plastic optical fiber sensor for concentration
sensing of ethanol (C
$_{2}$
H
$_{5}$
OH) is presented. The sensitivity is enhanced through V-number matching as well as by optimizing
the taper radius and taper length. The ray-tracing method is used to analyze the evanescent wave penetration depth
(EWPD). The theoretical analysis and experimental results are used to optimize the taper ratio and taper length for
the achievement of high EWPD and high sensitivity. The analysis indicates that the sensitivity of tapered fiber sensor
can be improved by decreasing the taper ratio with simultaneous increase in the taper length. The highest sensitivity
of 1.527 mV/% is achieved from the tapered fiber with a taper ratio of 0.27 and taper length of 8 cm.
The proposed parametric optimized tapered fiber sensor can detect the change in concentration of C
$_{2}$
H
$_{5}\!$
OH
as small as 6.55 × 10
$^{-3}$
.
© 2014 IEEE
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