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17 October 2007 Characterization and modelling of an improved method of phase detection scheme for displacement optic sensors
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Abstract
Based on a novel method for overcoming DC drift in RF subcarrier phase detection scheme for fibre optic sensors in this paper we propose an improved method for the measurement of small displacements and vibrations. The method works in open loop and is characterized by low distortions in the modulation process, good signal-to-noise ratio and rather low cost. Considering the receiver ideal, we obtained for the measurements of small distances a minimum of 0.74 μm with a 6.6 × 10-7 dB dynamic range. Also, we evaluated the probability density and modelled it vs the phase error for different values of the average number of photoelectrons generated by the signal and the phase noise parameter. The presented system can be exploited in the measurement of small distances, vibrations and seismic detection.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
N. N. Puscas, H. Gnewuch, D. A. Jackson, and A. Gh. Podoleanu "Characterization and modelling of an improved method of phase detection scheme for displacement optic sensors", Proc. SPIE 6744, Sensors, Systems, and Next-Generation Satellites XI, 67442L (17 October 2007); https://doi.org/10.1117/12.738363
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