Improved DFB-FL Sensor Interrogation With Low Harmonic Distortion Based on Extended Kalman Filter

Zhang, Jianxiang; Huang, Wenzhu; Zhang, Wentao; Li, Fang

doi:10.1109/jlt.2021.3082774

Cited by 12 publications

(3 citation statements)

References 28 publications

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“…Any two output optical signals in the 3 × 3 coupler have an ideal phase angle of 120 • . Here, the ellipse fitting algorithm (EFA) based on the Kalman filter [24] is used to simultaneously demodulate the phase changes ∆φ 1 and ∆φ 2 of the main and auxiliary interferometers, respectively. The simultaneous demodulation avoids the errors caused by time differences and algorithm differences.…”

Section: Phase Demodulationmentioning

confidence: 99%

“…The EFA based on the Kalman filter includes two stages: ellipse fitting and Kalman filter correction. In our previous work, we introduced the application of Kalman filter correction in the EFA in detail [24]. Kalman filter correction ensures the real-time updating of interference fringe parameters to reduce errors caused by inherent defects of the 3 × 3 coupler and light-intensity fluctuations.…”

Section: Phase Demodulationmentioning

confidence: 99%

“…The interference signals from the optical interferometer detected by the photodetectors (PDs) are [24] V…”

Section: Phase Demodulationmentioning

confidence: 99%

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Real-Time Measurement and Uncertainty Evaluation of Optical Path Difference in Fiber Optic Interferometer Based on Auxiliary Interferometer

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Optical interferometers are the main elements of interferometric sensing and measurement systems. Measuring their optical path difference (OPD) in real time and evaluating the measurement uncertainty are key to optimizing system noise and ensuring system consistency. With the continuous sinusoidal wavelength modulation of the laser, real-time OPD measurement of the main interferometer is achieved through phase comparison of the main and auxiliary interferometers. The measurement uncertainty of the main interferometer OPD is evaluated. It is the first evaluation of the impact of different auxiliary interferometer calibration methods on OPD measurements. A homodyne quadrature laser interferometer (HQLI) is used as the main interferometer, and a 3 × 3 interferometer is used as the auxiliary interferometer. The calibration of the auxiliary interferometer using optical spectrum analyzer scanning and ruler measurement is compared. The evaluation shows that the auxiliary interferometer is the most significant source of uncertainty and causes the total uncertainty to increase linearly with increasing OPD. It is proven that a high-precision calibration and large-OPD auxiliary interferometer can improve the real-time accuracy of OPD measurements based on the auxiliary interferometer. The scheme can determine the minimum uncertainty to optimize the system noise and consistency for vibration, hydroacoustic, and magnetic field measurements with OPDs of the ~m level.

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Section: Phase Demodulationmentioning

confidence: 99%

Section: Phase Demodulationmentioning

confidence: 99%