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 language | English |
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Article number | 151 |
Pages (from-to) | 619-622 |
Number of pages | 4 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 5855 PART II |
DOIs | |
Publication status | Published - 2005 |
Event | 17th International Conference on Optical Fibre Sensors, OFS-17 - Bruges, Belgium Duration: 23 May 2005 → 27 May 2005 |
Keywords
- Interferometer
- Signal processing
- Synthetic-heterodyne detection
- Vibration