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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 11 — Jun. 2, 2014
  • pp: 13916–13926

A packaged, low-cost, robust optical fiber strain sensor based on small cladding fiber sandwiched within periodic polymer grating

Chia-Chin Chiang and Chein-Hsing Li  »View Author Affiliations

Optics Express, Vol. 22, Issue 11, pp. 13916-13926 (2014)

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In the present study, a novel packaged long-period fiber grating (PLPFG) strain sensor is first presented. The MEMS process was utilized to fabricate the packaged optical fiber strain sensor. The sensor structure consisted of etched optical fiber sandwiched between two layers of thick photoresist SU-8 3050 and then packaged with poly (dimethylsiloxane) (PDMS) polymer material to construct the PLPFG strain sensor. The PDMS packaging material was used to prevent the glue effect, wherein glue flows into the LPFG structure and reduces coupling strength, in the surface bonding process. Because the fiber grating was packaged with PDMS material, it was effectively protected and made robust. The resonance attenuation dip of PLPFG grows when it is loading. This study explored the size effect of the grating period and fiber diameter of PLPFG via tensile testing. The experimental results found that the best strain sensitivity of the PLPFG strain sensor was −0.0342 dB/με, and that an R2 value of 0.963 was reached.

© 2014 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2440) Instrumentation, measurement, and metrology : Filters
(220.4000) Optical design and fabrication : Microstructure fabrication

ToC Category:

Original Manuscript: April 7, 2014
Revised Manuscript: May 23, 2014
Manuscript Accepted: May 24, 2014
Published: May 30, 2014

Chia-Chin Chiang and Chein-Hsing Li, "A packaged, low-cost, robust optical fiber strain sensor based on small cladding fiber sandwiched within periodic polymer grating," Opt. Express 22, 13916-13926 (2014)

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