Automatic carrier phase delay synchronization of PGC demodulation algorithm in fiber-optic interferometric sensors

• Changbo Hou,
• Shuai Guo,

Vol. 14, No. 7, July 31, 2020
10.3837/tiis.2020.07.009, Download Paper (Free):

• Phase-generated carrier
• fiber-optic interferometric sensors
• carrier phase delay synchronization
• orthogonal phase-locked

Abstract

Phase-generated carrier (PGC) demodulation algorithm is the main demodulation methods in Fiber-optic interferometric sensors (FOISs). The conventional PGC demodulation algorithms are influenced by the carrier phase delay between the interference signal and the carrier signal. In this paper, an automatic carrier phase delay synchronization (CPDS) algorithm based on orthogonal phase-locked technique is proposed. The proposed algorithm can calculate the carrier phase delay value. Then the carrier phase delay can be compensated by adjusting the initial phase of the fundamental carrier and the second-harmonic carrier. The simulation results demonstrate the influence of the carrier phase delay on the demodulation performance. PGC-Arctan demodulation system based on CPDS algorithm is implemented on SoC. The experimental results show that the proposed algorithm is able to obtain and eliminate the carrier phase delay. In comparison to the conventional demodulation algorithm, the signal-to-noise and distortion ratio (SINAD) of the proposed algorithm increases 55.99dB.

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