Yang, HZ;Qiao, XG;Ali, MM;Islam, MR;Lim, KS

2014

May

Journal Of Lightwave Technology

Optimized Tapered Optical Fiber for Ethanol (C2H5OH) Concentration Sensing

Published

14 ()

SIGNAL ACQUISITION SENSOR DESIGN

32

1777

1783

An optimized study of biconical tapered multi-mode plastic optical fiber sensor for concentration sensing of ethanol (C2H5OH) is presented. The sensitivity is enhanced through V-number matching as well as by optimizing the taper radius and taper length. The ray-tracingmethod 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 C2H5OH as small as 6.55 x 10(-3).

PISCATAWAY

0733-8724

10.1109/JLT.2014.2311175