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Your search keyword '"Yang, Hanrui"' showing total 23 results
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23 results on '"Yang, Hanrui"'

15. Initial Nonreciprocal Phase Shift Measurement Method for Reflective Fiber Optical Voltage Sensor

Author

Yang, Hanrui, Li, Zixin, Liu, Dongle, and Tian, Jiaxing

Abstract

The reflective piezoelectric effect fiber optic voltage sensor (RFOVS) encounters significant challenges in practical application. Due to limitations in the manufacturing process, achieving the theoretically reciprocal structure for RFOVS proves challenging. This limitation significantly impacts measurement accuracy due to the initial nonreciprocal phase shift and environmental-induced phase shift. This study introduces a novel measurement approach to address this challenge, facilitating a straightforward and efficient assessment of the initial nonreciprocal phase shift. This is achieved by precisely measuring the wavelength and wavelength spacing at adjacent troughs of intensity within the spectrum. Simulation analysis and experimental results demonstrate the efficacy of this measurement method, reducing the nonreciprocal phase shift error of the RFOVS to just 1/45 of its initial value. This discovery provides practical solutions and theoretical foundations for addressing the initial nonreciprocal phase shift issue in RFOVS, thereby promoting its practical application.

Published
2024
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19. Soil Water Content Measurement Using Polymer Optical Fibre Bragg Gratings

Author

Mehravar, Moura, Yang, Hanrui, Webb, David J, Zhang, Wei, Sestelani, Sina Fadaie, Chapman, David N, Mehravar, Moura, Yang, Hanrui, Webb, David J, Zhang, Wei, Sestelani, Sina Fadaie, and Chapman, David N

Abstract

Measuring soil water content is crucially important and can affect soil strength, which is a key parameter in the analysis, design and monitoring of geo-structures. In this study, an optical fibre Bragg grating sensor inscribed in polymer optical fibre was developed, and for the first time, its ability to measure soil water content was investigated. The sensitivity of the sensor to different values of gravimetric soil water content under the different compaction conditions of loose and normal compaction was tested. The effect of soil temperature on the sensor’s performance was considered. To assess the sensor’s implementation, accuracy and reliability, a commercial soil water content probe (SM150), which measures volumetric soil water content was employed. The results indicate that the developed sensor, when calibrated correctly, is able to provide detailed data on any minor variation of soil water content (e.g. 0.5%) with high precision. The outcomes of this study define an additional capability of the polymer optical fibre Bragg grating sensors, which is significantly important for the long-term performance monitoring of geo-structures.

Published
2022

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