Characterization and modelling of an improved method of phase detection scheme for displacement optic sensors

N. N. Puscas; H. Gnewuch; D. A. Jackson; A. Gh. Podoleanu

doi:10.1117/12.738363

17 October 2007 Characterization and modelling of an improved method of phase detection scheme for displacement optic sensors

N. N. Puscas, H. Gnewuch, D. A. Jackson, A. Gh. Podoleanu

Author Affiliations +

Proceedings Volume 6744, Sensors, Systems, and Next-Generation Satellites XI; 67442L (2007) https://doi.org/10.1117/12.738363
Event: SPIE Remote Sensing, 2007, Florence, Italy

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.

Citation Download Citation

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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