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Please use this identifier to cite or link to this item: http://dyuthi.cusat.ac.in/purl/2498

Title: Microbent optical fibers as evanescent wave sensors
Authors: Thomas Lee, S
Nampoori, V P N
Vallabhan, C P G
Radhakrishnan, P
Geetha, K
Keywords: microbend
f!ber optic sensor
evanescent wave
Issue Date: 2002
Publisher: Society of Photo-Optical Instrumentation Engineers
Abstract: Microbent optical fibers are potential candidates for evanescent wave sensing. We investigate the behavior of a permanently microbent fiber optic sensor when it is immersed in an absorbing medium. Two distinct detection schemes, namely, bright-field and dark-field detection configuration, are employed for the measurements. The optical power propagating through the sensor is found to vary in a logarithmic fashion with the concentration of the absorbing species in the surrounding medium. We observe that the sensitivity of the setup is dependent on the bending amplitude and length of the microbend region for the bright-field detection scheme, while it is relatively independent of both for the dark-field detection configuration. This feature can be exploited in compact sensor designs where reduction of the sensing region length is possible without sacrificing sensitivity.
URI: http://dyuthi.cusat.ac.in/purl/2498
Appears in Collections:Dr.C P Girijavallabhan

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