Fiber-optic pressure sensor based on π-phase-shifted fiber Bragg grating on side-hole fiber

Qi Zhang, Nan Liu, Thomas Fink, Hong Li, Wei Peng, Ming Han

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

We present a fiber-optic pressure sensor based on a π-phase-shifted fiber Bragg grating (π FBG) fabricated on a side-hole fiber. Due to the resonance effect of a πFBG, its reflection spectrum features two notches that are dramatically narrower than the linewidth of a regular FBG of similar length. The narrow spectral notches allow high-resolution measurement of their spectral separation, significantly improving the pressure detection limit (defined herein as the minimum detectable pressure change) compared to sensors based on a regular FBG of a similar length and on the same fiber. The π FBG demonstrated in this letter is 8.3 mm long and the linewidth of each spectral notch is only 3.6 pm, corresponding to a quality factor of 4.3 × 10 5. The spectral notch separation exhibited a sensitivity of 20 pm/kpsi to pressure, which was limited by the geometry of the fiber holes, and little sensitivity to temperature. The Bragg wavelength shift exhibited a sensitivity of 11.4 pm/°C to temperature. In practice, a spectral resolution of 0.028 pm can be easily achieved for the πFBG demonstrated in this letter, leading to a pressure detection limit of 1.4 psi and a temperature detection limit of 0.0025°C.

Original languageEnglish (US)
Article number6257419
Pages (from-to)1519-1522
Number of pages4
JournalIEEE Photonics Technology Letters
Volume24
Issue number17
DOIs
StatePublished - Aug 27 2012

Fingerprint

Fiber optic sensors
Pressure sensors
Fiber Bragg gratings
pressure sensors
Bragg gratings
fiber optics
fibers
Fibers
notches
Linewidth
sensitivity
Spectral resolution
Temperature
spectral resolution
Wavelength
temperature
Geometry
Q factors
Sensors
shift

Keywords

  • fiber Bragg grating (FBG)
  • microstructure fiber
  • optical fiber sensor
  • pressure measurement
  • π-phase-shifted fiber Bragg grating (πFBG)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

Fiber-optic pressure sensor based on π-phase-shifted fiber Bragg grating on side-hole fiber. / Zhang, Qi; Liu, Nan; Fink, Thomas; Li, Hong; Peng, Wei; Han, Ming.

In: IEEE Photonics Technology Letters, Vol. 24, No. 17, 6257419, 27.08.2012, p. 1519-1522.

Research output: Contribution to journalArticle

Zhang, Qi ; Liu, Nan ; Fink, Thomas ; Li, Hong ; Peng, Wei ; Han, Ming. / Fiber-optic pressure sensor based on π-phase-shifted fiber Bragg grating on side-hole fiber. In: IEEE Photonics Technology Letters. 2012 ; Vol. 24, No. 17. pp. 1519-1522.
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