Theoretical Analysis of pi-Phase-Shifted Fiber Bragg Grating for Longitudinal Ultrasonic Acoustic Wave

Dwivedi, Krishna Mohan; Khijwania, Sunil K.; Trivedi, Gaurav; Osuch, Tomasz

doi:10.1109/wrap47485.2019.9013692

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…FBG and PS-FBG were arranged in parallel on the plate. In a wavelength demodulation system with a tunable laser, the FBG length must be smaller than the ultrasonic wavelength to avoid the influence of the ultrasonic strain nonuniform micro-bending modulation on the FBG detection results [19]- [20]. The PS-FBG has a much smaller effective detection length than its own grating length due to the phase shift at its center and has an extremely sharp resonance for high sensitivity, and increasing the PS-FBG length can increase its ultrasonic detection sensitivity in a tunable laserbased demodulation system [21].…”

Section: Comparative Experiments Of Fbg and Ps-fbg Response To Ultras...mentioning

confidence: 99%

Study on Time-frequency Imaging of Ultrasonic Detection with Phase Shifted Fiber Bragg Grating Sensing

Meng

Tan

2023

Measurement Science Review

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The influence of the wavelength difference between the laser source and the phase-shifted fiber Bragg grating (PS-FBG) on the intensity of the power demodulation system based on an adjustable laser source was studied experimentally, and the optimum of the output laser wavelength was determined. Then, the research on time-frequency imaging damage identification based on smooth pseudo-Wigner-Ville distribution was carried out. The Time of Flight of the acoustic wave signal was calculated and time compensation was made according to the Wigner-Ville distribution and the Lamb wave dispersion curve. The ultrasonic waves before and after damage were measured with spatially arranged PS-FBGs. The difference signals were processed in a window, and then the time-frequency energy of the normalized difference signal was imaged to assess the damage detection and location. Although the mode and group velocity of ultrasound measured by each fiber grating were different, the accurate location and identification of artificial damage in an aluminum alloy plate was realized by using only three PS-FBGs and a smooth Wigner time-frequency imaging method.

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Section: Comparative Experiments Of Fbg and Ps-fbg Response To Ultras...mentioning

confidence: 99%

Study on Time-frequency Imaging of Ultrasonic Detection with Phase Shifted Fiber Bragg Grating Sensing

Meng

Tan

2023

Measurement Science Review

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Recent Advancement of Phase Shifted Fiber Bragg Grating Sensor for Ultrasonic Wave Application: A Review

2022

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Theoretical Study and Optimization of Apodized Fiber Bragg Grating for Single and Quasi-distributed Structural Health Monitoring Applications

Dwivedi

Trivedi

Khijwania

2020

2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)

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Theoretical Analysis of pi-Phase-Shifted Fiber Bragg Grating for Longitudinal Ultrasonic Acoustic Wave

Cited by 3 publications

References 18 publications

Study on Time-frequency Imaging of Ultrasonic Detection with Phase Shifted Fiber Bragg Grating Sensing

Study on Time-frequency Imaging of Ultrasonic Detection with Phase Shifted Fiber Bragg Grating Sensing

Recent Advancement of Phase Shifted Fiber Bragg Grating Sensor for Ultrasonic Wave Application: A Review

Theoretical Study and Optimization of Apodized Fiber Bragg Grating for Single and Quasi-distributed Structural Health Monitoring Applications

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