Strain Calibration of Substrate-Free FBG Sensors at Cryogenic Temperature

  • Venkataraman Narayanan Venkatesan
  • Klaus-Peter Weiss
  • Ram Prakash Bharti
  • Holger Neumann
  • Rajinikumar Ramalingam
Conference paper
Part of the Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering book series (LNICST, volume 170)


Strain calibration measurements are performed for acrylate coated, substrate-free fiber Bragg grating (FBG) sensors at room temperature of 298 K and cryogenic temperature of 77 K. A 1550 nm Bragg wavelength (λB) FBG sensor, with its sensing part not being bonded to any surface, is subjected to axial strain using MTS25 tensile machine available at Cryogenic Material tests Karlsruhe (CryoMaK), KIT. The Bragg wavelength shift (ΔλB) versus induced strain (ε) is regressed with a linear polynomial function and the strain sensitivity obtained is found to be 0.9 pm/µε at both the temperatures, verifying that the FBG strain sensitivity is independent of temperature.


Fiber Bragg gratings (FBG) Cryogenic applications Strain sensitivity Strain calibration 


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Copyright information

© ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2016

Authors and Affiliations

  • Venkataraman Narayanan Venkatesan
    • 1
    • 2
  • Klaus-Peter Weiss
    • 1
  • Ram Prakash Bharti
    • 2
  • Holger Neumann
    • 1
  • Rajinikumar Ramalingam
    • 1
  1. 1.Institute for Technical Physics (ITEP)Karlsruhe Institute of Technology (KIT)Eggenstein-LeopoldshafenGermany
  2. 2.Department of Chemical EngineeringIndian Institute of Technology (IIT) RoorkeeRoorkeeIndia

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