Five-wavelength laser interferometry for the demodulation of dual-cavity extrinsic Fabry–Perot interferometric sensors

Yang Han; Yi Jiang; Jingshan Jia; Yutong Zhang

doi:10.1016/j.optlastec.2025.113286

Five-wavelength laser interferometry for the demodulation of dual-cavity extrinsic Fabry–Perot interferometric sensors

Yang Han, Yi Jiang^*, Jingshan Jia, Yutong Zhang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

In this paper, a five-wavelength passive demodulation algorithm is proposed and experimentally demonstrated. The performance of the proposed technique is verified in the dual-cavity extrinsic Fabry–Perot interferometer. The experimental results show that a 100 Hz sinusoidal signal can be successfully demodulated in dual-cavity extrinsic Fabry–Perot interferometric sensors with one initial cavity lengths of 110.9375 µ m and 542.0920 µ m, respectively. At the same time, the displacements of 55.1043 µ m and 69.4655 µ m occurred in the one cavity of the dual-cavity interferometer are successfully demodulated by this algorithm. It shows that the technique can be used for high-speed demodulation of dual-cavity interferometers.

Original language	English
Article number	113286
Journal	Optics and Laser Technology
Volume	191
DOIs	https://doi.org/10.1016/j.optlastec.2025.113286
Publication status	Published - Dec 2025
Externally published	Yes

Keywords

Dynamic measurement
Laser interferometry
Optical fiber sensor

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10.1016/j.optlastec.2025.113286

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title = "Five-wavelength laser interferometry for the demodulation of dual-cavity extrinsic Fabry–Perot interferometric sensors",

abstract = "In this paper, a five-wavelength passive demodulation algorithm is proposed and experimentally demonstrated. The performance of the proposed technique is verified in the dual-cavity extrinsic Fabry–Perot interferometer. The experimental results show that a 100 Hz sinusoidal signal can be successfully demodulated in dual-cavity extrinsic Fabry–Perot interferometric sensors with one initial cavity lengths of 110.9375 µ m and 542.0920 µ m, respectively. At the same time, the displacements of 55.1043 µ m and 69.4655 µ m occurred in the one cavity of the dual-cavity interferometer are successfully demodulated by this algorithm. It shows that the technique can be used for high-speed demodulation of dual-cavity interferometers.",

keywords = "Dynamic measurement, Laser interferometry, Optical fiber sensor",

author = "Yang Han and Yi Jiang and Jingshan Jia and Yutong Zhang",

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doi = "10.1016/j.optlastec.2025.113286",

language = "English",

volume = "191",

journal = "Optics and Laser Technology",

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T1 - Five-wavelength laser interferometry for the demodulation of dual-cavity extrinsic Fabry–Perot interferometric sensors

AU - Han, Yang

AU - Jiang, Yi

AU - Jia, Jingshan

AU - Zhang, Yutong

PY - 2025/12

Y1 - 2025/12

N2 - In this paper, a five-wavelength passive demodulation algorithm is proposed and experimentally demonstrated. The performance of the proposed technique is verified in the dual-cavity extrinsic Fabry–Perot interferometer. The experimental results show that a 100 Hz sinusoidal signal can be successfully demodulated in dual-cavity extrinsic Fabry–Perot interferometric sensors with one initial cavity lengths of 110.9375 µ m and 542.0920 µ m, respectively. At the same time, the displacements of 55.1043 µ m and 69.4655 µ m occurred in the one cavity of the dual-cavity interferometer are successfully demodulated by this algorithm. It shows that the technique can be used for high-speed demodulation of dual-cavity interferometers.

AB - In this paper, a five-wavelength passive demodulation algorithm is proposed and experimentally demonstrated. The performance of the proposed technique is verified in the dual-cavity extrinsic Fabry–Perot interferometer. The experimental results show that a 100 Hz sinusoidal signal can be successfully demodulated in dual-cavity extrinsic Fabry–Perot interferometric sensors with one initial cavity lengths of 110.9375 µ m and 542.0920 µ m, respectively. At the same time, the displacements of 55.1043 µ m and 69.4655 µ m occurred in the one cavity of the dual-cavity interferometer are successfully demodulated by this algorithm. It shows that the technique can be used for high-speed demodulation of dual-cavity interferometers.

KW - Dynamic measurement

KW - Laser interferometry

KW - Optical fiber sensor

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JO - Optics and Laser Technology

JF - Optics and Laser Technology

M1 - 113286

ER -

Five-wavelength laser interferometry for the demodulation of dual-cavity extrinsic Fabry–Perot interferometric sensors

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