The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Hongcan Gu - One of the best experts on this subject based on the ideXlab platform.
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Demodulation of a Hydroacoustic Sensor Array of Fiber Interferometers Based on Ultra-Weak Fiber Bragg Grating Reflectors Using a Self-Referencing Signal
Journal of Lightwave Technology, 2019Co-Authors: Ciming Zhou, Yandong Pang, Li Qian, Xi Chen, Qiannan Xu, Chenguang Zhao, Haoran Zhang, Ziwei Tu, Junbin Huang, Hongcan GuAbstract:We report on current theoretical and experimental results of hydroacoustic sensing array based on ultra-weak fiber Bragg gratings, using a modified phase generated carrier (PGC) Demodulation method with a self-referencing signal. The self-referencing signal is obtained by a sensor isolated from acoustic signals and other environmental disturbances. We report improvements over the conventional PGC methods. Using our Demodulation method and with nonsensitized bare fiber (reference sensor0) keeping separate from water, experiment testing demonstrates a minimum detectable hydroacoustic pressure of 2239 μPa/√Hz. The properties of our Demodulation method are also compared with those of the conventional PGC algorithms. Both simulation and experiments indicate that our Demodulation method is immune to the drifts of modulation depth C and of carrier frequency, and the detectable frequency range can be increased by five times compared to using conventional PGC methods with the same carrier frequency. The sensor array exhibits a particularly large response in the very low frequency region, which is of great importance for underwater seismic detection and submarine applications.
Xuantung Pham - One of the best experts on this subject based on the ideXlab platform.
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Demodulation method for tilted fiber bragg grating refractometer with high sensitivity
Journal of Applied Physics, 2018Co-Authors: Xuantung Pham, Tao Che, Ruize Wang, Houju Cao, Xu HouAbstract:In this paper, we propose a Demodulation method for refractive index (RI) sensing with tilted fiber Bragg gratings (TFBGs). It operates by monitoring the TFBG cladding mode resonance “cut-off wavelengths.” The idea of a “cut-off wavelength” and its determination method are introduced. The RI sensitivities of TFBGs are significantly enhanced in certain RI ranges by using our Demodulation method. The temperature-induced cross sensitivity is eliminated. We also demonstrate a parallel-double-angle TFBG (PDTFBG), in which two individual TFBGs are inscribed in the fiber core in parallel using a femtosecond laser and a phase mask. The RI sensing range of the PDTFBG is significantly broader than that of a conventional single-angle TFBG. In addition, its RI sensitivity can reach 1023.1 nm/refractive index unit in the 1.4401–1.4570 RI range when our proposed Demodulation method is used.In this paper, we propose a Demodulation method for refractive index (RI) sensing with tilted fiber Bragg gratings (TFBGs). It operates by monitoring the TFBG cladding mode resonance “cut-off wavelengths.” The idea of a “cut-off wavelength” and its determination method are introduced. The RI sensitivities of TFBGs are significantly enhanced in certain RI ranges by using our Demodulation method. The temperature-induced cross sensitivity is eliminated. We also demonstrate a parallel-double-angle TFBG (PDTFBG), in which two individual TFBGs are inscribed in the fiber core in parallel using a femtosecond laser and a phase mask. The RI sensing range of the PDTFBG is significantly broader than that of a conventional single-angle TFBG. In addition, its RI sensitivity can reach 1023.1 nm/refractive index unit in the 1.4401–1.4570 RI range when our proposed Demodulation method is used.
Qida Zhao - One of the best experts on this subject based on the ideXlab platform.
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dynamic temperature compensating interrogation technique for strain sensors with tilted fiber bragg gratings
IEEE Photonics Technology Letters, 2008Co-Authors: Yinping Miao, Bo Liu, Weihua Zhang, Bo Dong, Haibin Zhou, Qida ZhaoAbstract:In this letter, we propose a novel method of edge filter linear Demodulation using tilted fiber Bragg gratings (TFBGs) in a fiber sensor system. Based on the filter characteristics of TFBGs and the same temperature characteristics as the FBG, the strain sensor Demodulation system with dynamic temperature compensation can be achieved. An experimental system is built up to achieve one or multichannels of sensor Demodulation. The experimental results were analyzed in detail. Using this method based on intensity, linear Demodulation with a bandwidth of 6 nm can be achieved. The advantages of this system are an all-fiber design, quasi-static and dynamic operation, and potential high-speed Demodulation.
Ciming Zhou - One of the best experts on this subject based on the ideXlab platform.
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Demodulation of a Hydroacoustic Sensor Array of Fiber Interferometers Based on Ultra-Weak Fiber Bragg Grating Reflectors Using a Self-Referencing Signal
Journal of Lightwave Technology, 2019Co-Authors: Ciming Zhou, Yandong Pang, Li Qian, Xi Chen, Qiannan Xu, Chenguang Zhao, Haoran Zhang, Ziwei Tu, Junbin Huang, Hongcan GuAbstract:We report on current theoretical and experimental results of hydroacoustic sensing array based on ultra-weak fiber Bragg gratings, using a modified phase generated carrier (PGC) Demodulation method with a self-referencing signal. The self-referencing signal is obtained by a sensor isolated from acoustic signals and other environmental disturbances. We report improvements over the conventional PGC methods. Using our Demodulation method and with nonsensitized bare fiber (reference sensor0) keeping separate from water, experiment testing demonstrates a minimum detectable hydroacoustic pressure of 2239 μPa/√Hz. The properties of our Demodulation method are also compared with those of the conventional PGC algorithms. Both simulation and experiments indicate that our Demodulation method is immune to the drifts of modulation depth C and of carrier frequency, and the detectable frequency range can be increased by five times compared to using conventional PGC methods with the same carrier frequency. The sensor array exhibits a particularly large response in the very low frequency region, which is of great importance for underwater seismic detection and submarine applications.
Xu Hou - One of the best experts on this subject based on the ideXlab platform.
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Demodulation method for tilted fiber bragg grating refractometer with high sensitivity
Journal of Applied Physics, 2018Co-Authors: Xuantung Pham, Tao Che, Ruize Wang, Houju Cao, Xu HouAbstract:In this paper, we propose a Demodulation method for refractive index (RI) sensing with tilted fiber Bragg gratings (TFBGs). It operates by monitoring the TFBG cladding mode resonance “cut-off wavelengths.” The idea of a “cut-off wavelength” and its determination method are introduced. The RI sensitivities of TFBGs are significantly enhanced in certain RI ranges by using our Demodulation method. The temperature-induced cross sensitivity is eliminated. We also demonstrate a parallel-double-angle TFBG (PDTFBG), in which two individual TFBGs are inscribed in the fiber core in parallel using a femtosecond laser and a phase mask. The RI sensing range of the PDTFBG is significantly broader than that of a conventional single-angle TFBG. In addition, its RI sensitivity can reach 1023.1 nm/refractive index unit in the 1.4401–1.4570 RI range when our proposed Demodulation method is used.In this paper, we propose a Demodulation method for refractive index (RI) sensing with tilted fiber Bragg gratings (TFBGs). It operates by monitoring the TFBG cladding mode resonance “cut-off wavelengths.” The idea of a “cut-off wavelength” and its determination method are introduced. The RI sensitivities of TFBGs are significantly enhanced in certain RI ranges by using our Demodulation method. The temperature-induced cross sensitivity is eliminated. We also demonstrate a parallel-double-angle TFBG (PDTFBG), in which two individual TFBGs are inscribed in the fiber core in parallel using a femtosecond laser and a phase mask. The RI sensing range of the PDTFBG is significantly broader than that of a conventional single-angle TFBG. In addition, its RI sensitivity can reach 1023.1 nm/refractive index unit in the 1.4401–1.4570 RI range when our proposed Demodulation method is used.
