Enhancement of wavelength detection accuracy in fiber Bragg grating sensors by using a spectrum correlation technique

J. M. Gong, C. C. Chan, Wei Jin, J. M.K. MacAlpine, M. Zhang, Y. B. Liao

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

3 Citations (Scopus)


A digital post-processing technique based on spectrum correlation is developed and applied to determining the Bragg wavelength shift accuracy in fiber Bragg grating (FBG) sensors. Theoretical analysis shows that the enhancement factor is proportional to the square root of the number of the independent sampling points within the 3d B bandwidth of the FBG. A wavelength detection accuracy of better than 1 pm in terms of standard deviation was experimentally demonstrated, representing an enhancement factor of 7.3 over the conventional peak detection technique. This technique may also be used for applications such as white light interferometer sensors where the interferometric pattern shifts with applied measurand while the shape of the pattern remains unchanged.
Original languageEnglish
Title of host publication2002 15th Optical Fiber Sensors Conference Technical Digest, OFS 2002
Number of pages4
ISBN (Electronic)0780372891, 9780780372894
Publication statusPublished - 1 Jan 2002
Event15th Optical Fiber Sensors Conference Technical Digest, OFS 2002 - Hilton Portland, Portland, United States
Duration: 6 May 200210 May 2002


Conference15th Optical Fiber Sensors Conference Technical Digest, OFS 2002
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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