Valley-positioning-assisted discrete cross-correlation algorithm for fast cavity length interrogation of fiber-optic Fabry–Perot sensors

Kang, Jiawen; Chen, Haibin; Zhang, Xiongxing; Zhang, Junying; Guo, Zhen; Wang, Wei

doi:10.1016/j.measurement.2022.111411

Cited by 8 publications

(2 citation statements)

References 21 publications

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“…Based on the spectrum pattern of an ideal FP sensor, a simulated spectrum S v λ is constructed. Then, using the software cross-correlation algorithm, the correlation number C between the real spectrum and the virtual spectrum obtained is expressed as [34] C…”

Section: Testing and Discussionmentioning

confidence: 99%

Temperature-Decoupled Single-Crystal MgO Fiber-Optic Fabry–Perot Vibration Sensor Based on MEMS Technology for Harsh Environments

Su,

Jia,

Zhao

et al. 2024

Micromachines

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A high-temperature-resistance single-crystal magnesium oxide (MgO) extrinsic Fabry–Perot (FP) interferometer (EFPI) fiber-optic vibration sensor is proposed and experimentally demonstrated at 1000 °C. Due to the excellent thermal properties (melting point > 2800 °C) and optical properties (transmittance ≥ 90%), MgO is chosen as the ideal material to be placed in the high-temperature testing area. The combination of wet chemical etching and direct bonding is used to construct an all-MgO sensor head, which is favorable to reduce the temperature gradient inside the sensor structure and avoid sensor failure. A temperature decoupling method is proposed to eliminate the cross-sensitivity between temperature and vibration, improving the accuracy of vibration detection. The experimental results show that the sensor is stable at 20−1000 °C and 2−20 g, with a sensitivity of 0.0073 rad (20 °C). The maximum nonlinearity error of the vibration sensor measurement after temperature decoupling is 1.17%. The sensor with a high temperature resistance and outstanding dynamic performance has the potential for applications in testing aero-engines and gas turbine engines.

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Section: Testing and Discussionmentioning

confidence: 99%

Temperature-Decoupled Single-Crystal MgO Fiber-Optic Fabry–Perot Vibration Sensor Based on MEMS Technology for Harsh Environments

Su,

Jia,

Zhao

et al. 2024

Micromachines

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show abstract

“…The main problem in determining the main peak is the extraction of the envelope of a series of peaks in the cross-correlation curve, which may introduce additional errors affecting the correct determination of the main peak. Kang et al 21 proposed a valley-positioning-assisted discrete cross-correlation algorithm, which can greatly increase the cavity length extraction rate by significantly reducing the computation amount. The only problem is that the discretization process makes the demodulation performances greatly depend on the valley positioning precision.…”

Section: Introductionmentioning

confidence: 99%

Fundamental and high-order cross-correlation combined demodulation method for absolute cavity length measurement of fiber-optic Fabry–Perot sensors

Zhang

Guo

et al. 2022

Opt. Eng.

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. For the accurate cavity-length demodulation of fiber-optic Fabry–Perot (FP) sensors, a combined correlation method based on the fundamental cross-correlation and a higher-order one is proposed, simulated, and experimentally verified. By extending the reflection spectrum eightfold through continuous frequency-doubling three times, cross-correlation using both the original and eightfold spectra, and determination of the main peak of the fundamental cross-correlation coefficient function with the assistance of the eighth-order cross-correlation coefficient, the cavity-length demodulation resolution for fiber-optic FP sensors can be significantly improved even when the spectral bandwidth of the source is limited or the cavity length is relatively short. A cavity length resolution better than 1.8 nm is achieved for an FP sensor with a cavity length of ∼162 μm. The proposed demodulation method can effectively reduce the bandwidth requirement of the light source for the cavity-length extraction of fiber-optic FP sensors, particularly those with relatively short cavity lengths.

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Integrated fiber-optic Fabry–Perot vibration/acoustic sensing system based on high-speed phase demodulation

Li,

Zhao,

et al. 2024

Optics & Laser Technology

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Valley-positioning-assisted discrete cross-correlation algorithm for fast cavity length interrogation of fiber-optic Fabry–Perot sensors

Cited by 8 publications

References 21 publications

Temperature-Decoupled Single-Crystal MgO Fiber-Optic Fabry–Perot Vibration Sensor Based on MEMS Technology for Harsh Environments

Temperature-Decoupled Single-Crystal MgO Fiber-Optic Fabry–Perot Vibration Sensor Based on MEMS Technology for Harsh Environments

Fundamental and high-order cross-correlation combined demodulation method for absolute cavity length measurement of fiber-optic Fabry–Perot sensors

Integrated fiber-optic Fabry–Perot vibration/acoustic sensing system based on high-speed phase demodulation

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