Temperature-insensitive ultrasonic sensor system based on a fiber ring laser for acoustic emission detection

Tongqing Liu, Guigen Liu, Lingling Hu, Ming Han

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations


We develop a novel ultrasonic sensor system using a fiber ring laser (FRL) to detect acoustic emissions. The sensor system incorporates two fiber Bragg gratings (FBGs) in the FRL cavity, a short and strong FBG as the sensing element and a long and weak FBG as the adapting element. The reflection spectra of both FBGs are matched such that the reflection peak of the long FBG is positioned at the linear slope of the short FBG's reflection spectrum. Ultrasonic waves impinging onto the FBGs are to modulate the FRL cavity loss, which leads to laser intensity variations that can be detected directly by photodetectors. The two FBGs are placed side-by-side in close proximity so that the sensor system is able to adapt to the ambient temperature drift. We demonstrate that the ultrasonic sensor system can operate normally within approximately 15°C temperature change. In addition, the performance of signal-to-noise ratios is investigated as a function of the FRL cavity loss. The proposed temperature-insensitive sensor system is attractive in practical applications where temperature change is unavoidable.

Original languageEnglish (US)
Title of host publicationFiber Optic Sensors and Applications XI
ISBN (Print)9781628410358
StatePublished - 2014
EventFiber Optic Sensors and Applications XI - Baltimore, MD, United States
Duration: May 8 2014May 9 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceFiber Optic Sensors and Applications XI
Country/TerritoryUnited States
CityBaltimore, MD


  • Nondestructive evaluation
  • fiber Bragg gratings
  • fiber lasers
  • fiber-optic sensors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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