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Self-alignment method for four integral bucket phase demodulation in displacement interferometry.

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Title: Self-alignment method for four integral bucket phase demodulation in displacement interferometry.
Authors: Liu, Qi1,2,3 (AUTHOR), Lin, Jiajun1,2,3 (AUTHOR), Liu, Junfeng1,2,3 (AUTHOR), Lai, Tao1,2,3 (AUTHOR), Luo, Gangjie1,2,3 (AUTHOR), Li, Zelong1,2,3 (AUTHOR), Chen, Shanyong1,2,3 (AUTHOR) mesychen@163.com
Source: Optics & Laser Technology. Dec2025, Vol. 191, pN.PAG-N.PAG. 1p.
Subjects: Phase modulation, Demodulation, Interferometry, Pails, Calibration
Abstract: The four integrating buckets phase demodulation technique, as one of the mainstream phase demodulation methods, is widely used in fiber-optic interferometric measurements. The phase modulation depth and the degree of phase matching of the modulated signal directly affect the phase demodulation results. Due to the presence of unknown phase delay effects in interferometric measurement systems, the calibration step is challenging when using this method for phase demodulation. This paper proposes a phase self-calibration method for fiber-optic interferometry applications. By establishing an elliptical model evaluation criterion, the optimal matching phase value for modulation at any modulation depth can be determined. Simulation analysis and experimental verification based on displacement measurement were conducted. The results indicate that the influence of phase delay is suppressed, and both linear and sinusoidal displacements are accurately reconstructed at modulation depths of 1.85 rad and 2.02 rad. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The four integrating buckets phase demodulation technique, as one of the mainstream phase demodulation methods, is widely used in fiber-optic interferometric measurements. The phase modulation depth and the degree of phase matching of the modulated signal directly affect the phase demodulation results. Due to the presence of unknown phase delay effects in interferometric measurement systems, the calibration step is challenging when using this method for phase demodulation. This paper proposes a phase self-calibration method for fiber-optic interferometry applications. By establishing an elliptical model evaluation criterion, the optimal matching phase value for modulation at any modulation depth can be determined. Simulation analysis and experimental verification based on displacement measurement were conducted. The results indicate that the influence of phase delay is suppressed, and both linear and sinusoidal displacements are accurately reconstructed at modulation depths of 1.85 rad and 2.02 rad. [ABSTRACT FROM AUTHOR]
ISSN:00303992
DOI:10.1016/j.optlastec.2025.113288