Novel fiber bragg grating sensing method based on the sidelobe modulation for ultrasound detection
This contribution demonstrates the interaction between the fiber Bragg grating (FBG) and the ultrasound. When the grating length is much longer than the ultrasonic wavelength, the conventional wavelength-modulation method is invalid. In order to find out an effective sensing method, in this case, a...
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sg-ntu-dr.10356-1412872020-06-05T08:33:34Z Novel fiber bragg grating sensing method based on the sidelobe modulation for ultrasound detection Liang, Sheng Tjin, Swee Chuan Lin, Bo Sheng, Xinzhi Lou, Shuqin Zhang, Yongxin Wang, Xin School of Electrical and Electronic Engineering The Photonics Institute Engineering::Electrical and electronic engineering Fiber Bragg Grating (FBG) Fiber-optic Sensor This contribution demonstrates the interaction between the fiber Bragg grating (FBG) and the ultrasound. When the grating length is much longer than the ultrasonic wavelength, the conventional wavelength-modulation method is invalid. In order to find out an effective sensing method, in this case, a novel sidelobe modulation has been proposed and investigated. When grating length is much longer than the ultrasonic wavelength, the Bragg wavelength is not shifted; however, the reflectivity of sidelobe is modulated by ultrasound, periodically, which can be utilized as an effective ultrasound sensing method. In order to optimize the performances of this method, the characteristics of the sidelobes are further analyzed for different ultrasonic displacement amplitude, frequency, and grating length, respectively. The analysis results indicate that a proper choice of the grating length would enable the sidelobe modulation to be utilized for detecting the ultrasound with an appropriate range of ultrasonic frequency and amplitude. This method is preliminarily validated in the experiment, and the experimental results show that our proposed sidelobe-modulation method is effective to detect the 7.8 MHz ultrasonic wave by a simple intensity-demodulation using a 5 mm FBG, where the wavelength modulation is invalid. 2020-06-05T08:33:34Z 2020-06-05T08:33:34Z 2018 Journal Article Liang, S., Tjin, S. C., Lin, B., Sheng, X., Lou, S., Zhang, Y., & Wang, X. (2019). Novel fiber bragg grating sensing method based on the sidelobe modulation for ultrasound detection. Journal of Lightwave Technology, 37(11), 2686-2693. doi:10.1109/JLT.2018.2862635 0733-8724 https://hdl.handle.net/10356/141287 10.1109/JLT.2018.2862635 2-s2.0-85050985947 11 37 2686 2693 en Journal of Lightwave Technology © 2018 IEEE. All rights reserved. |
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Engineering::Electrical and electronic engineering Fiber Bragg Grating (FBG) Fiber-optic Sensor Liang, Sheng Tjin, Swee Chuan Lin, Bo Sheng, Xinzhi Lou, Shuqin Zhang, Yongxin Wang, Xin Novel fiber bragg grating sensing method based on the sidelobe modulation for ultrasound detection |
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This contribution demonstrates the interaction between the fiber Bragg grating (FBG) and the ultrasound. When the grating length is much longer than the ultrasonic wavelength, the conventional wavelength-modulation method is invalid. In order to find out an effective sensing method, in this case, a novel sidelobe modulation has been proposed and investigated. When grating length is much longer than the ultrasonic wavelength, the Bragg wavelength is not shifted; however, the reflectivity of sidelobe is modulated by ultrasound, periodically, which can be utilized as an effective ultrasound sensing method. In order to optimize the performances of this method, the characteristics of the sidelobes are further analyzed for different ultrasonic displacement amplitude, frequency, and grating length, respectively. The analysis results indicate that a proper choice of the grating length would enable the sidelobe modulation to be utilized for detecting the ultrasound with an appropriate range of ultrasonic frequency and amplitude. This method is preliminarily validated in the experiment, and the experimental results show that our proposed sidelobe-modulation method is effective to detect the 7.8 MHz ultrasonic wave by a simple intensity-demodulation using a 5 mm FBG, where the wavelength modulation is invalid. |
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School of Electrical and Electronic Engineering |
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School of Electrical and Electronic Engineering Liang, Sheng Tjin, Swee Chuan Lin, Bo Sheng, Xinzhi Lou, Shuqin Zhang, Yongxin Wang, Xin |
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Article |
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Liang, Sheng Tjin, Swee Chuan Lin, Bo Sheng, Xinzhi Lou, Shuqin Zhang, Yongxin Wang, Xin |
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Liang, Sheng |
title |
Novel fiber bragg grating sensing method based on the sidelobe modulation for ultrasound detection |
title_short |
Novel fiber bragg grating sensing method based on the sidelobe modulation for ultrasound detection |
title_full |
Novel fiber bragg grating sensing method based on the sidelobe modulation for ultrasound detection |
title_fullStr |
Novel fiber bragg grating sensing method based on the sidelobe modulation for ultrasound detection |
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Novel fiber bragg grating sensing method based on the sidelobe modulation for ultrasound detection |
title_sort |
novel fiber bragg grating sensing method based on the sidelobe modulation for ultrasound detection |
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2020 |
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https://hdl.handle.net/10356/141287 |
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