Interferometric fiber-optic sensing via digital signal processing

Barry Griffin, Michael J. Connelly

Research output: Contribution to journalConference articlepeer-review

Abstract

An acquisition system pertaining to fiber-optic interferometric sensing 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 the Synthetic-Heterodyne detection technique, while simultaneously relaying control and signal data via PC based software. The system was tested using a low-finesse extrinsic Fabry-Perot cavity, consisting of a cleaved fiber end and a mirror mounted on a piezoelectric cylinder. Applying a sinusoidal voltage to the piezoelectric cylinder vibrated the mirror. 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 number73
Pages (from-to)580-585
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5826
DOIs
Publication statusPublished - 2005
EventOpto-Ireland 2005: Optical Sensing and Spectroscopy - Dublin, Ireland
Duration: 4 Apr 20056 Apr 2005

Keywords

  • Digital signal processing
  • Dynamic pressure
  • Interferometer
  • Low-finesse extrinsic Fabry-Perot cavity
  • Synthetic-Heterodyne detection

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