Based on the platform of phase modulation scheme, we report here our studies on the detection of strain and temperature separately by fabricating a single-mode fiber based ineterferometric sensor. We configured a fiber optic version of Double-Slit type set-up as the basic interferometer using fused 3dB biconical tapered fiber coupler as the coherent optical power splitter. The influence of the measurand parameters, namely, temperature and strain inducing an effective relative phase along one arm of the interferometer fiber are observed in terms of fringe-shift that is measured with experimental precision. We deployed the sensor to investigate its accuracy in strain and temperature measurement in the backdrop of theoretical prediction. In both the cases separately, we have obtained the linear relation between fringe-shift and strain (or temperature). In strain measurement, an average sensitivity ~2.50x10⁶ m^-1 is achieved reproducibly, while in temperature measurement, a change in the temperature of 0.25°C has been detected repeatedly using this setup. Our experimentally measured data confirming the theoretically predicted values demonstrates the accuracy and efficacy of the experimental configuration as a useful sensor.

Date Published: 23 August 2011
PDF: 6 pages
Proc. SPIE 8173, Photonics 2010: Tenth International Conference on Fiber Optics and Photonics, 817322 (23 August 2011); doi: 10.1117/12.900011

Published in SPIE Proceedings Vol. 8173:
Photonics 2010: Tenth International Conference on Fiber Optics and Photonics
Sunil K. Khijwania; Banshi D. Gupta; Bishnu P. Pal; Anurag Sharma, Editor(s)