A flow measurement system consisting of an optical fiber Fabry–Perot（F-P） sensor and an elbow tube is proposed and demonstrated to realize flow measurements and eliminate thermal disturbance.Two F-P sensors are sym...A flow measurement system consisting of an optical fiber Fabry–Perot（F-P） sensor and an elbow tube is proposed and demonstrated to realize flow measurements and eliminate thermal disturbance.Two F-P sensors are symmetrically mounted on the inner-wall surface of the elbow of 90° in order to eliminate the effect of thermal disturbance to the flow measurement accuracy.Experimental results show that the absolute phase difference is the square root of the fluid flow.It is consistent with the theoretical analysis,which proves that the flow measurement method can measure flow and eliminate the influence of thermal disturbance simultaneously.展开更多
A new wavelength division multiplexing method for fiber Bragg grating（FBG） sensors based on spectrum profile identification is proposed. In this method, FBGs and tilted FBG（TFBG） sensors are cascaded in a single f...A new wavelength division multiplexing method for fiber Bragg grating（FBG） sensors based on spectrum profile identification is proposed. In this method, FBGs and tilted FBG（TFBG） sensors are cascaded in a single fiber in one sensing channel. The different spectrum profiles enable the cross-correlation method to demodulate the wavelength. Therefore, the different types of sensors can occupy the same central wavelength band. Using this method, the multiplexing capacity is optimized. Experiment results demonstrate the feasibility of this method and it is useful for applications where large numbers of FBGs are needed.展开更多
基金supported by the National Instrumentation Program of China(No.2013YQ030915)the National Natural Science Foundation of China(Nos.61675152,61227011,61378043,61475114,61505139,and 61505138)+2 种基金the open project of Key Laboratory of Micro Opto-electro Mechanical System Technology,Tianjin University,Ministry of Education(No.MOMST2016-3)the Shenzhen Science and Technology Research Project(No.JCYJ20120831153904083)the SEM Soft Science Research and Development Project of Ministry of Housing and Urban-Rural Development of China(No.2016-K4-087)
文摘A flow measurement system consisting of an optical fiber Fabry–Perot（F-P） sensor and an elbow tube is proposed and demonstrated to realize flow measurements and eliminate thermal disturbance.Two F-P sensors are symmetrically mounted on the inner-wall surface of the elbow of 90° in order to eliminate the effect of thermal disturbance to the flow measurement accuracy.Experimental results show that the absolute phase difference is the square root of the fluid flow.It is consistent with the theoretical analysis,which proves that the flow measurement method can measure flow and eliminate the influence of thermal disturbance simultaneously.
基金supported by the National Instrumentation Program of China(No.2013YQ030915)the National Natural Science Foundation of China(Nos.61227011,61378043,61505139,61475114,and 11004150)+3 种基金the Tianjin Natural Science Foundation(No.13JCYBJC16200)the Shenzhen Science and Technology Research Project(No.JCYJ20120831153904083)the National Basic Research Program of China(No.2010CB327802)the Soft Science Research and Development Project of the Ministry of Housing and Urban-Rural Development of China(No.2016-K4-087)
文摘A new wavelength division multiplexing method for fiber Bragg grating（FBG） sensors based on spectrum profile identification is proposed. In this method, FBGs and tilted FBG（TFBG） sensors are cascaded in a single fiber in one sensing channel. The different spectrum profiles enable the cross-correlation method to demodulate the wavelength. Therefore, the different types of sensors can occupy the same central wavelength band. Using this method, the multiplexing capacity is optimized. Experiment results demonstrate the feasibility of this method and it is useful for applications where large numbers of FBGs are needed.
