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Temperature and Salinity Dual-parameter Sensing Based on Forward Brillouin Scattering in 1060-XP SMF
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作者 LIU Pengkai ZHANG Wujun LU Yuangang 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2024年第S01期89-95,共7页
A novel temperature and salinity discriminative sensing method based on forward Brillouin scattering(FBS)in 1060-XP single-mode fiber(SMF)is proposed.The measured frequency shifts corresponding to different radial aco... A novel temperature and salinity discriminative sensing method based on forward Brillouin scattering(FBS)in 1060-XP single-mode fiber(SMF)is proposed.The measured frequency shifts corresponding to different radial acoustic modes in 1060-XP SMF show different sensitivities to temperature and salinity.Based on the new phenomenon that different radial acoustic modes have different frequency shift-temperature and frequency shift-salinity coefficients,we propose a novel method for simultaneously measuring temperature and salinity by measuring the frequency shift changes of two FBS scattering peaks.In a proof-of-concept experiment,the temperature and salinity measurement errors are 0.12℃and 0.29%,respectively.The proposed method for simultaneously measuring temperature and salinity has the potential applications such as ocean surveying,food manufacturing and pharmaceutical engineering. 展开更多
关键词 forward Brillouin scattering(FBS) optical fiber sensor salinity sensing temperature sensing
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电磁发射打击精度计算方法分析
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作者 唐晓燕 连海根 +1 位作者 余俊松 杜雪 《科技创新与应用》 2021年第21期20-22,共3页
电磁轨道炮精确打击在电磁轨道炮研究领域具有非常重要的地位,文章根据圆概率误差CEP50的计算方法给出相应的CEP70、CEP80计算公式,同时提出最大包络法和图解法这两种新的射向散布计算方法,通过对不同的射向散布计算方法进行对比分析,... 电磁轨道炮精确打击在电磁轨道炮研究领域具有非常重要的地位,文章根据圆概率误差CEP50的计算方法给出相应的CEP70、CEP80计算公式,同时提出最大包络法和图解法这两种新的射向散布计算方法,通过对不同的射向散布计算方法进行对比分析,寻找适合电磁发射技术的射击精度评估方法。 展开更多
关键词 打击精度 射向散布 最大包络法 图解法
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Demodulated method of optical fiber Stokes temperature sensors 被引量:1
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作者 ZHANG Li-xun LIAO Yun DAI Zhi-yong OU Zhong-hua LIU Yong-zhi PENG Zeng-shou 《Optoelectronics Letters》 EI 2006年第5期345-347,共3页
Based on the Stokes signals of the spontaneous Raman backscattering,a demodulated method for the simultaneous distributed temperature measurement in an optical fiber is presented to improve the sensitivity of the sens... Based on the Stokes signals of the spontaneous Raman backscattering,a demodulated method for the simultaneous distributed temperature measurement in an optical fiber is presented to improve the sensitivity of the sensor.The experimental system of Stokes temperature sensor is set up and 2 km of operating length,1 m of distance resolution ,accuracy of ±0.1℃ are obtained. 展开更多
关键词 光学纤维 温度传感器 反向散射 分布式
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FBS Effect and Temperature Dependence in Trench-Assisted Multimode Fiber
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作者 ZHANG Zelin LU Yuangang +2 位作者 XIE Youwen HUANG Jian ZHOU Lang 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2020年第S01期95-101,共7页
We propose the trench-assisted multimode fiber(TA-OM4)as a novel sensing fiber in forward Brillouin scattering(FBS)-based temperature sensor,due to its higher temperature sensitivity,better bending resistance and lowe... We propose the trench-assisted multimode fiber(TA-OM4)as a novel sensing fiber in forward Brillouin scattering(FBS)-based temperature sensor,due to its higher temperature sensitivity,better bending resistance and lower propagation loss,compared with the single mode fiber(SMF)and other sensing fibers.The FBS effect and acousto-optic interaction in TA-OM4 are the first time to be demonstrated and characterized at 1550 nm theoretically and experimentally.A 2.0 km long TA-OM4 is put into an oven to measure its temperature sensitivity,which can reach up to 80.3 kHz/℃,exceeding 53%of SMF(52.4 kHz/℃).The simulated and experimental results verify that the TA-OM4 may be a good candidate as the sensing fiber for the FBS-based temperature sensor. 展开更多
关键词 forward Brillouin scattering acousto-optic interaction optic-fiber sensor temperature sensitivity multimode fiber
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On temporal-spatial distribution of backscatter coefficients over China determined by TOPEX/Poseidon mission 被引量:6
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作者 GUO JinYun YANG Lei +2 位作者 LIU Xin HWANG CheinWay YANG Hong 《Science China Earth Sciences》 SCIE EI CAS 2012年第12期2068-2083,共16页
This paper deals with the backscatter coefficients known as sigma0 at Ku band and C band based on the GDR-M (Merged Geophysical Data Record) of TOPEX/Poseidon (T/P) through Jan.1993 to Dec.2004 over land surface of Ch... This paper deals with the backscatter coefficients known as sigma0 at Ku band and C band based on the GDR-M (Merged Geophysical Data Record) of TOPEX/Poseidon (T/P) through Jan.1993 to Dec.2004 over land surface of China.After smoothing and interpolating the backscatter coefficients for both bands, we achieve the 5′×5′ grid data and the time series of backscatter coefficients in 12 years.The spatial distribution of sigma0 over typical areas (wetland, desert, mountainous area, agriculture base, etc.) of Chinese territory is analyzed and discussed.The fast Fourier transformation (FFT) is used to detect the cycles of seasonal variations of sigma0 time series and gives that the annual period is the major cycle.Meanwhile a semiannual period is also found in some places.We use the least squares method on both periods and find that the amplitude of annual period is obviously greater than that of semi-annual period.The relationship among the anomalousness of time series, variations of environment and climate change, and the serious natural calamity (flood, drought) is also discussed.Data of topography slope extracted from SRTM are used to do correlation analysis with the backscatter coefficients in parts of China to quantify the impact of slope on backscatter coefficients in Ku and C bands, and the results show that they all have a negative correlation but the magnitudes are different in different places with different coverages.Such as the area of Liaoning and Jilin has the maximum correlation -0.56, the Taklimakan Desert has the minimum correlation -0.11, and the other places commonly have correlations in (-0.3, -0.5). 展开更多
关键词 backscatter coefficient satellite altimetry TOPEX/POSEIDON land surface SRTM
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