Interferometric fiber optic sensor interrogation system using digital signal processing and synthetic-heterodyne detection

Barry Griffin, Michael J. Connelly

Research output: Contribution to journalConference articlepeer-review

Abstract

An interrogation system for fiber optic interferometric sensors is presented. The system consists of a digital signal processor, a codec, laser bias and modulation control circuits, an optical receiver and customized software. The system transmits a modulated light signal to the sensing interferometer, demodulates the returning interferometric signal using synthetic-heterodyne detection, while simultaneously relaying control and signal data via PC based software. The system was tested using a low-finesse Fabry-Perot cavity, consisting of a cleaved fiber end and a mirror mounted on a piezoelectric cylinder. The mirror was vibrated using a sinusoidal voltage applied to the piezoelectric cylinder. Using the interrogation systems, successful retrieval of the vibration signal was obtained for vibrating frequencies from 44 Hz to 4.41 kHz.

Original languageEnglish
Article number151
Pages (from-to)619-622
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5855 PART II
DOIs
Publication statusPublished - 2005
Event17th International Conference on Optical Fibre Sensors, OFS-17 - Bruges, Belgium
Duration: 23 May 200527 May 2005

Keywords

  • Interferometer
  • Signal processing
  • Synthetic-heterodyne detection
  • Vibration

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