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Single fiber Bragg grating sensor with two sections of different diameters for longitudinal strain and temperature discrimination with enhanced strain sensitivity

Rev. Sci. Instrum. 80, 103106 (2009); doi:10.1063/1.3247900

Published 30 October 2009

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Samir K. Mondal,1,2 Umesh Tiwari,1,2 Gopal C. Poddar,1,2 Vandana Mishra,1,2 Nahar Singh,1,2 Subhash C. Jain,1,2 S. N. Sarkar,3 K. D. Chattoypadhya,1,2 and Pawan Kapur1,2
1Central Scientific Instruments Organisations, Sec.-30C, Chandigarh, India
2Council of Scientific and Industrial Research, New Delhi 110001, India
3Department of Electronic Science, University of Calcutta, 92-A.P.C Road, Kolkata 700 009, India
A single fiber Bragg grating (FBG) sensor with two sections of different diameters is proposed and experimentally demonstrated for discrimination and measurement of strain and temperature. A section of single FBG is etched in hydrofluoric acid solution to reduce diameter of the fiber by factor of <1/2 to increase its strain sensitivity. Different shifts of the Bragg wavelengths of chemically etched and nonetched gratings caused by different strain sensitivities are used to discriminate and measure strain and temperature. Maximum errors of ±13µepsilon (microstrain) and ±1 °C are reported over 1700µepsilon and 60 °C measurement ranges, respectively. Depending upon the diameter of the etched fiber grating, the design can also discriminate nanostrain from temperature. ©2009 American Institute of Physics
History: Received 16 July 2009; accepted 14 September 2009; published 30 October 2009
Permalink: http://link.aip.org/link/?RSINAK/80/103106/1
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KEYWORDS and PACS

Keywords
PACS
  • 42.81.Pa
    Fiber optic sensors, fiber gyros
  • 42.79.Dj
    Gratings
  • 47.80.Fg
    Pressure and temperature measurements in fluid dynamics
  • 07.20.Dt
    Thermometers
  • 07.10.Pz
    Instruments for strain, force, and torque
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
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