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 language | English |
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Article number | 73 |
Pages (from-to) | 580-585 |
Number of pages | 6 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 5826 |
DOIs | |
Publication status | Published - 2005 |
Event | Opto-Ireland 2005: Optical Sensing and Spectroscopy - Dublin, Ireland Duration: 4 Apr 2005 → 6 Apr 2005 |
Keywords
- Digital signal processing
- Dynamic pressure
- Interferometer
- Low-finesse extrinsic Fabry-Perot cavity
- Synthetic-Heterodyne detection