High-speed spectrum demodulation of fiber-optic Fabry–Perot sensor based on scanning laser

Xu, Yufu; Qi, Hongchao; Zhao, Xinyu; Li, Chenxi; Chen, Ke

doi:10.1016/j.optlaseng.2024.108192

Cited by 6 publications

(2 citation statements)

References 38 publications

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“…High-resolution demodulation of the optical path difference of FPI is completed by using a high-speed spectrum acquisition unit and a demodulation algorithm based on white light interference . The average optical path difference l 0 of FPI is expressed as l 0 = 2 n ( p ) h where h is the distance between the cantilever and the fiber end face.…”

Section: Theoretical Analysis Of Pressure Characteristicsmentioning

confidence: 99%

Pressure-Compensated Fiber-Optic Photoacoustic Sensors for Trace SO₂ Analysis in Gas Insulation Equipment

Zhao,

Zhang,

Han

et al. 2024

Anal. Chem.

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Section: Theoretical Analysis Of Pressure Characteristicsmentioning

confidence: 99%

Pressure-Compensated Fiber-Optic Photoacoustic Sensors for Trace SO₂ Analysis in Gas Insulation Equipment

Zhao,

Zhang,

Han

et al. 2024

Anal. Chem.

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“…Recently, fiber-optic sensing technology has been rapidly developed, driving the advancement of all-optical PA gas detection solutions. − A passive fiber-optic PA sensor was designed for gas telemetry in our previous study . The gas sensing head was linked with a demodulation system through two fibers for laser and probe light transmission, respectively.…”

mentioning

confidence: 99%

Fiber-Optic Photoacoustic Gas Microsensor Dual Enhanced by Helmholtz Resonator and Interferometric Cantilever

Li,

Han,

Guo

et al. 2024

Anal. Chem.

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A high-sensitivity fiber-optic photoacoustic (PA) gas microsensor is demonstrated with dual enhancement based on acoustics and detection. Due to the characteristic of small size, a Helmholtz resonator is integrated into a miniature PA sensor. The acoustically amplified PA signal is detected by a high-sensitivity fiber Fabry−Perot (F−P) interferometric cantilever. The first-order resonant frequencies of the interferometric cantilever and Helmholtz resonator are matched by subtle adjustments. The weak PA signal is significantly enhanced in a volume of only 0.35 mL, which breaks the volume limitation of the resonance modes in traditional PA sensing systems. To improve the resolution of the microsensor, a white light interferometry (WLI)based spectral demodulation algorithm is utilized. The experimental results indicate that the minimum detection limit of acetylene (C 2 H 2 ) drops to about 15 ppb with an averaging time of 100 s, corresponding to the normalized noise equivalent absorption (NNEA) coefficient of 2.7 × 10 −9 W•cm −1 •Hz −1/2 . The dual resonance enhanced fiber-optic PA gas microsensor has the merits of high sensitivity, intrinsic safety, and compact structure.

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Influence of water vapor concentration on photoacoustic spectroscopy‐based characteristic gas analysis of transformer faults

Mo,

Zhou,

Han

et al. 2024

Micro & Optical Tech Letters

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The water vapor in the ambient air affects the accuracy of the photoacoustic (PA) dissolved gas analysis system for transformer health monitoring. A laser PA system was evaluated by dry and humidified standard gases to study the influence of water vapor concentration on PA gas detection. Theoretical analysis was conducted on the effect of gas molecule relaxation on PA signal detection. A high‐frequency resonant PA cell and a low‐frequency nonresonant PA cell were used to detect acetylene (C2H2) and carbon monoxide (CO), respectively. The experimental results show that the PA signal of humidified CO is about 12 times higher than PA signal of dry gas for the resonant PA detection system, respectively. In addition, as the frequency is increased from 30 to 980 Hz, the PA signals of humidified and dry CO attenuate by 1.5 and 6.9 times, respectively.

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High-speed spectrum demodulation of fiber-optic Fabry–Perot sensor based on scanning laser

Cited by 6 publications

References 38 publications

Pressure-Compensated Fiber-Optic Photoacoustic Sensors for Trace SO₂ Analysis in Gas Insulation Equipment

Pressure-Compensated Fiber-Optic Photoacoustic Sensors for Trace SO₂ Analysis in Gas Insulation Equipment

Fiber-Optic Photoacoustic Gas Microsensor Dual Enhanced by Helmholtz Resonator and Interferometric Cantilever

Influence of water vapor concentration on photoacoustic spectroscopy‐based characteristic gas analysis of transformer faults

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High-speed spectrum demodulation of fiber-optic Fabry–Perot sensor based on scanning laser

Cited by 6 publications

References 38 publications

Pressure-Compensated Fiber-Optic Photoacoustic Sensors for Trace SO2 Analysis in Gas Insulation Equipment

Pressure-Compensated Fiber-Optic Photoacoustic Sensors for Trace SO2 Analysis in Gas Insulation Equipment

Fiber-Optic Photoacoustic Gas Microsensor Dual Enhanced by Helmholtz Resonator and Interferometric Cantilever

Influence of water vapor concentration on photoacoustic spectroscopy‐based characteristic gas analysis of transformer faults

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Product

Resources

About

Pressure-Compensated Fiber-Optic Photoacoustic Sensors for Trace SO₂ Analysis in Gas Insulation Equipment

Pressure-Compensated Fiber-Optic Photoacoustic Sensors for Trace SO₂ Analysis in Gas Insulation Equipment