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Vol. 131, Issue 8, August 2011, pp.36-42




 Strain-Temperature Discrimination Using a Single FBG at Cryogenic Region


1*D. Sengupta, 1M. Sai Shankar, 2Tiwari, Umesh, 1P. Kishore, 1P. Saidi Reddy,
1R. L. N Sai Prasad, 1P. Vengal Rao, 1K. S. Narayana

1Department of Physics, National Institute of Technology, Waranagal, India

2Central Scientific Instruments Organization, Photonics, India

*E-mail: guuptasengupta@gmail.com



Received: 16 July 2011   /Accepted: 22 August 2011   /Published: 30 August 2011

Handbook of Laboaratory Measurements book


Abstract: A simple technique is presented to discriminate the Strain and Temperature with a single Fiber Bragg Grating (FBG) at cryogenic regime. The single FBG is divided into two parts, one half is without coating (FBG1) and other half is coated with Cyno-Acrylic Adhesive (FBG2). The measured temperature and strain sensitivities of the FBG1 are 4.05x10-6 /K and 2.1310-6 /ε and FBG2 are 1.39 x 10-5 /K and 1.72 x 10-6 /ε respectively. FBG2 is more sensitive to low temperature and FBG1 is more sensitive to axial strain.


Keywords: Fiber Bragg grating, Coating, Strain, Temperature


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