Interferometric fiber optic sensing via digital signal processing

Barry Griffin; Michael J. Connelly

doi:10.1117/12.604499

3 June 2005 Interferometric fiber optic sensing via digital signal processing

Barry Griffin, Michael J. Connelly

Proceedings Volume 5826, Opto-Ireland 2005: Optical Sensing and Spectroscopy; (2005) https://doi.org/10.1117/12.604499
Event: OPTO-Ireland, 2005, Dublin, Ireland

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.

Citation Download Citation

Barry Griffin and Michael J. Connelly "Interferometric fiber optic sensing via digital signal processing", Proc. SPIE 5826, Opto-Ireland 2005: Optical Sensing and Spectroscopy, (3 June 2005); https://doi.org/10.1117/12.604499

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