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Strain measurements on a cantilever beam with fiber bragg grating sensors using a pair of collimators

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Abstract

Fiber bragg grating (FBG) sensors are currently in use in various fields. However, it is difficult to use these sensors to obtain strain measurements at locations where it is not physically possible to connect the fibers to each other. In the present study, we performed strain measurements using many FBG sensors connected to a single optical fiber and a pair of collimators. The single optical fiber connected to the FBG sensors was installed on a cantilevered beam with another optical fiber line connected to a stationary optical interrogator. The two optical fiber lines were connected by a pair of collimators making use of the fact that light travels in a straight line through space. Our experiment demonstrated that the wavelength of the light changed linearly as it passed between the two collimators, and that this change increased with the applied strain. Accurate strain measurements could be obtained by applying a proposed collimator collection factor.

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Abbreviations

λ B :

wavelength

Δλ B :

wavelength change

α f :

thermal expansion coefficient of the optical fiber

σ f :

thermooptic coefficient

P e :

photoelasticity constant

ɛ :

strain

Δ T :

temperature change

ΔNλ :

nominal wavelength change

CCF:

collimator correction factor

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Authors and Affiliations

  1. Department of Mechanical Engineering, ERI, Gyeongsang National University, 501, Jinju-daero, Jinju, Gyeongnam, Republic of Korea, 660-701

    Min-Kyu Kang, Dong-Jin Park & Seok-Soon Lee

Authors
  1. Min-Kyu Kang
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  2. Dong-Jin Park
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  3. Seok-Soon Lee
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Correspondence to Seok-Soon Lee.

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Kang, MK., Park, DJ. & Lee, SS. Strain measurements on a cantilever beam with fiber bragg grating sensors using a pair of collimators. Int. J. Precis. Eng. Manuf. 13, 455–458 (2012). https://doi.org/10.1007/s12541-012-0059-6

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  • DOI: https://doi.org/10.1007/s12541-012-0059-6

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