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Applied Optics

Applied Optics


  • Vol. 41, Iss. 9 — Mar. 20, 2002
  • pp: 1661–1667

Multipoint temperature-independent fiber-Bragg-grating strain-sensing system employing an optical-power-detection scheme

Yan-Ju Chiang, Likarn Wang, Horng-Shyang Chen, Chih-Chung Yang, and Wen-Fung Liu  »View Author Affiliations

Applied Optics, Vol. 41, Issue 9, pp. 1661-1667 (2002)

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A temperature-independent fiber-Bragg-grating strain-sensing system, based on a novel optical-power-detection scheme, is developed and analyzed. In this system a pair of fiber Bragg gratings with reflection spectra either partially or substantially overlapping is placed side by side to form a temperature-independent strain-sensor unit. Conventional wavelength-interrogation techniques are not used here, and instead an optical-power-detection scheme is proposed to directly calibrate the measurand, i.e., the strain. Unlike the conventional approach in a multiplexed sensing system, the presented power-detection-based interrogation method does not need the fiber-Bragg-grating sensors to be spectrally separate. The only requirement is that the spectra of the two fiber Bragg gratings of each sensor unit in a multiplexed system be identical or slightly separate (slightly overlapping spectra would also work in the sensing scheme) and the source’s optical power be sufficient for sensitive measurement. Based on a three-sensor-unit system, we demonstrate simple strain measurements of high linearity (±0.4%), good sensitivity [2 microstrains (µS)], high thermal stability (±0.8%), and zero cross talk. The effects of light source spectral flatness and fiber bending loss on measurement accuracy are also discussed.

© 2002 Optical Society of America

OCIS Codes
(040.1880) Detectors : Detection
(050.2770) Diffraction and gratings : Gratings
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2410) Fiber optics and optical communications : Fibers, erbium
(120.6810) Instrumentation, measurement, and metrology : Thermal effects

Original Manuscript: June 22, 2001
Revised Manuscript: October 10, 2001
Published: March 20, 2002

Yan-Ju Chiang, Likarn Wang, Horng-Shyang Chen, Chih-Chung Yang, and Wen-Fung Liu, "Multipoint temperature-independent fiber-Bragg-grating strain-sensing system employing an optical-power-detection scheme," Appl. Opt. 41, 1661-1667 (2002)

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