KEYWORDS: Digital signal processing, Signal detection, Interferometry, Signal processing, Fiber optics sensors, Modulation, Demodulation, Fabry–Perot interferometers, Sensing systems, Fiber optics
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.
KEYWORDS: Digital signal processing, Signal detection, Signal processing, Interferometry, Fiber optics sensors, Demodulation, Modulation, Sensors, Receivers, Computing systems
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.
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