1 December 2002 Microbent optical fibers as evanescent wave sensors
Author Affiliations +
Optical Engineering, 41(12), (2002). doi:10.1117/1.1519243
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.
S. Thomas Lee, K. Geetha, V. P. N. Nampoori, C. P. G. Vallabhan, Periasamy Radhakrishnan, "Microbent optical fibers as evanescent wave sensors," Optical Engineering 41(12), (1 December 2002). http://dx.doi.org/10.1117/1.1519243
JOURNAL ARTICLE
5 PAGES


SHARE
KEYWORDS
Cladding

Sensors

Optical fibers

Fiber optics sensors

Wave sensors

Absorption

Biological and chemical sensing

RELATED CONTENT

A Cold Fabry-Perot Spectrometer
Proceedings of SPIE (May 03 1979)
Streak artifact reduction in cardiac cone beam CT
Proceedings of SPIE (April 29 2005)
NIRCam thermal subsystem
Proceedings of SPIE (September 12 2007)

Back to Top