Skip to main content
Article thumbnail
Location of Repository

Multiplexing of Fibre optic long period Grating based interferometric sensors

By R. P. Murphy, Stephen W. James and Ralph P. Tatam

Abstract

Two long-period gratings (LPGs) fabricated in series in an optical fiber form a Mach-Zehnder interferometer, producing a sinusoidal channelled spectrum within the characteristic LPG attenuation bands, which has the appearance of an interference fringe pattern. The phase of the fringes is sensitive to changes in the surrounding environmental parameters, such as refractive index. Fabrication of a number of identical cascaded LPG pairs with different separations produces independent fringe patterns of different frequencies within the attenuation bands. The application of basic Fourier techniques to analyze the transmission spectrum allows the phase of each fringe pattern to be determined independently, facilitating the differentiation of external effects acting on each interferomete

Publisher: IEEE Institute of Electrical and Electronics
Year: 2007
DOI identifier: 10.1109/JLT.2006.889670
OAI identifier: oai:dspace.lib.cranfield.ac.uk:1826/4695
Provided by: Cranfield CERES
Journal:

Suggested articles

Citations

  1. (1998). Bending sensitivity of in-series long-period gratings,” doi
  2. (2005). Cascaded long period gratings with nano-structured coatings,” doi
  3. (2002). Enhanced sensitivity fibre optic long period grating temperature sensor,” Meas. doi
  4. (2001). Fibre modal index measurements based on fibre gratings,” doi
  5. (2001). Fibre-optic sensing applications of a pair of long-period fibre gratings,” doi
  6. (1982). Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry,” doi
  7. (1986). Frequency-division multiplexing of optical-fiber sensors using a frequency-modulated source,” doi
  8. (1987). Multiplexing of optical fiber sensors using a frequency-modulated source and gated output,” doi
  9. (2003). Optical fibre long period grating sensors: Characteristics and application,” doi
  10. (2000). Study of in fiber Mach–Zehnder interferometer based on two spaced 3-dB long period gratings surrounded by a refractive index higher than that of silica,” doi
  11. (2004). The interrogation and multiplexing of long period grating curvature sensors using a Bragg grating based, derivative spectroscopy technique,” doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.