PMMA based optical fiber Bragg grating for measuring moisture in transformer oil

W. Zhang*, D.J. Webb

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Water contamination can cause serious problems that compromise in transformer's safe operation and reduce its lifetime. Online monitoring of moisture concentration in transformer oil would permit the control of moisture buildup. This letter presents a direct optical measurement of moisture concentration in transformer oil using a poly(methyl methacrylate) (PMMA)-based optical fiber Bragg grating (POFBG). The refractive index and volume of PMMA-based optical fiber vary with the moisture in the surrounding transformer oil, changing the reflecting wavelength of the grating. A sensitivity of POFBG wavelength change to moisture content of 29 pm/ppm is demonstrated in this letter, indicating detectable water content better than 0.05 ppm.

Original languageEnglish
Pages (from-to)2427-2430
Number of pages4
JournalIEEE Photonics Technology Letters
Volume28
Issue number21
Early online date4 Aug 2016
DOIs
Publication statusPublished - 1 Nov 2016

Fingerprint

Insulating oil
Polymethyl Methacrylate
Fiber Bragg gratings
Polymethyl methacrylates
polymethyl methacrylate
moisture
transformers
Bragg gratings
Optical fibers
Moisture
oils
optical fibers
moisture content
Wavelength
optical measurement
wavelengths
Diffraction gratings
contamination
Water content
gratings

Bibliographical note

© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Keywords

  • equilibrium relative humidity
  • Fiber Bragg gratings
  • moisture control
  • polymer optical fiber

Cite this

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PMMA based optical fiber Bragg grating for measuring moisture in transformer oil. / Zhang, W.; Webb, D.J.

In: IEEE Photonics Technology Letters, Vol. 28, No. 21, 01.11.2016, p. 2427-2430.

Research output: Contribution to journalArticle

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