The Experts below are selected from a list of 161910 Experts worldwide ranked by ideXlab platform
Yuliang Liu - One of the best experts on this subject based on the ideXlab platform.
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Optical Fiber sensor based on fabry perot cavity
2012Co-Authors: Tuanwei Xu, Fang Li, Yuliang LiuAbstract:The invention provides an Optical Fiber sensor based on a Fabry-Perot cavity. The Optical Fiber sensor comprises a detection light source, an Optical Fiber Fabry-Perot cavity, an Optical detector and a servo circuit module, wherein the Optical Fiber Fabry-Perot cavity is arranged at the rear end of the light path of the detection light source, the length of the Optical Fiber Fabry-Perot cavity changes with the born physical quantity, detection light is reflected for multiple times on the two side surfaces of the Optical Fiber Fabry-Perot cavity to form interference fringes and the detection light emerges from one end far away from the detection light source; the Optical detector is arranged at the rear end of the light path of the Optical Fiber Fabry-Perot cavity and is used for receiving the detection light which emerges from one end of the Optical Fiber Fabry-Perot cavity far away from the detection light source; and the servo circuit module is used for controlling the detection light source to emit the detection light, receiving the intensity of the detection light through the Optical detector and inverting the physical quantity born by the Optical Fiber Fabry-Perot cavity. Since an intensity demodulation technique is adopted, the Optical Fiber sensor based on the Fabry-Perot cavity has the advantages that the expensive and large-size wavelength related devices are not required, the dimension of the entire sensor is reduced and the cost of the sensor is decreased at the same time.
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diaphragm type Optical Fiber pressure sensor
2010Co-Authors: Yuliang Liu, Fang LiAbstract:A diaphragm type Optical Fiber pressure sensor is characterized in that: the sensor comprises a support barrel, a diaphragm, an Optical Fiber grating, an end cap and a temperature compensation Optical Fiber grating, wherein, the support barrel is the body of the Optical Fiber pressure sensor and is cylindrical, a circular hole is arranged at a coaxial position on the lower side wall of the barrel; the diaphragm is arranged on the bottom of the support barrel to close the lower end of the support barrel; The Optical Fiber grating is fixed on the diaphragm, and tail Fibers of the Optical Fiber grating pass through the circular hole on the side wall of the support barrel; the end cap covers the top of the support barrel; and the temperature compensation Optical Fiber grating is fixed under the end cap and tail Fibers of the temperature compensation Optical Fiber grating pass through the circular hole on the side wall of the support barrel.
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Optical Fiber Optical grating pressure sensor
2008Co-Authors: Lihui Liu, Fang Li, Yuliang LiuAbstract:An Optical Fiber and raster pressure sensor is provided, which has the structure that: a first Optical Fiber and raster and a second Optical Fiber and raster with different wavelength form a sensor; the first Optical Fiber and raster is installed in the capillary for shielding external pressure; the first Optical Fiber and raster and the second Optical Fiber are fixed axially in a metal barrel-shaped container by the glue sealing of low elasticity modulus; the side wall of the metal barrel is opened with a pressure hole, and an air cavity is left at one end or two ends of the metal barrel; the other end of the first Optical Fiber and raster and the second Optical Fiber raster are both extended out the metal barrel-shaped container to form two ports. One port of the Optical Fiber pressure sensors are connected with one end of 2 multiplied with 2 or 1 multiplied with 2 Optical Fiber coupler or an Optical circulator; the other ends of the Optical Fiber coupler or the Optical circulator are connected with an incidence light source and a light detector; when the external pressure changing, the wavelength of the Optical Fiber and raster drift. With the viration of the detected wavelength, the variation of the tested pressure is counted through detecting the change of wavelength.
Fang Li - One of the best experts on this subject based on the ideXlab platform.
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Optical Fiber sensor based on fabry perot cavity
2012Co-Authors: Tuanwei Xu, Fang Li, Yuliang LiuAbstract:The invention provides an Optical Fiber sensor based on a Fabry-Perot cavity. The Optical Fiber sensor comprises a detection light source, an Optical Fiber Fabry-Perot cavity, an Optical detector and a servo circuit module, wherein the Optical Fiber Fabry-Perot cavity is arranged at the rear end of the light path of the detection light source, the length of the Optical Fiber Fabry-Perot cavity changes with the born physical quantity, detection light is reflected for multiple times on the two side surfaces of the Optical Fiber Fabry-Perot cavity to form interference fringes and the detection light emerges from one end far away from the detection light source; the Optical detector is arranged at the rear end of the light path of the Optical Fiber Fabry-Perot cavity and is used for receiving the detection light which emerges from one end of the Optical Fiber Fabry-Perot cavity far away from the detection light source; and the servo circuit module is used for controlling the detection light source to emit the detection light, receiving the intensity of the detection light through the Optical detector and inverting the physical quantity born by the Optical Fiber Fabry-Perot cavity. Since an intensity demodulation technique is adopted, the Optical Fiber sensor based on the Fabry-Perot cavity has the advantages that the expensive and large-size wavelength related devices are not required, the dimension of the entire sensor is reduced and the cost of the sensor is decreased at the same time.
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diaphragm type Optical Fiber pressure sensor
2010Co-Authors: Yuliang Liu, Fang LiAbstract:A diaphragm type Optical Fiber pressure sensor is characterized in that: the sensor comprises a support barrel, a diaphragm, an Optical Fiber grating, an end cap and a temperature compensation Optical Fiber grating, wherein, the support barrel is the body of the Optical Fiber pressure sensor and is cylindrical, a circular hole is arranged at a coaxial position on the lower side wall of the barrel; the diaphragm is arranged on the bottom of the support barrel to close the lower end of the support barrel; The Optical Fiber grating is fixed on the diaphragm, and tail Fibers of the Optical Fiber grating pass through the circular hole on the side wall of the support barrel; the end cap covers the top of the support barrel; and the temperature compensation Optical Fiber grating is fixed under the end cap and tail Fibers of the temperature compensation Optical Fiber grating pass through the circular hole on the side wall of the support barrel.
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Optical Fiber Optical grating pressure sensor
2008Co-Authors: Lihui Liu, Fang Li, Yuliang LiuAbstract:An Optical Fiber and raster pressure sensor is provided, which has the structure that: a first Optical Fiber and raster and a second Optical Fiber and raster with different wavelength form a sensor; the first Optical Fiber and raster is installed in the capillary for shielding external pressure; the first Optical Fiber and raster and the second Optical Fiber are fixed axially in a metal barrel-shaped container by the glue sealing of low elasticity modulus; the side wall of the metal barrel is opened with a pressure hole, and an air cavity is left at one end or two ends of the metal barrel; the other end of the first Optical Fiber and raster and the second Optical Fiber raster are both extended out the metal barrel-shaped container to form two ports. One port of the Optical Fiber pressure sensors are connected with one end of 2 multiplied with 2 or 1 multiplied with 2 Optical Fiber coupler or an Optical circulator; the other ends of the Optical Fiber coupler or the Optical circulator are connected with an incidence light source and a light detector; when the external pressure changing, the wavelength of the Optical Fiber and raster drift. With the viration of the detected wavelength, the variation of the tested pressure is counted through detecting the change of wavelength.
Zhang Huijun - One of the best experts on this subject based on the ideXlab platform.
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method for forming Optical Fiber fabry perot cavity with controlled cavity length
2017Co-Authors: Jiang Qin, Sui Guanghui, Zhang Huijun, Chen Shuang-yan, Wu Tian, Li JingfeiAbstract:The invention belongs to the technical field of Optical Fiber sensing and particularly relates to a method for forming an Optical Fiber Fabry-Perot cavity with a controlled cavity length. According to the method, a plane reflection piece and an end face of a transmission Optical Fiber are used to form the Fabry-Perot cavity, the parallelism of the end faces of the transmission Optical Fiber and the plane reflection piece is ensured through a hollow collimator, a 3D precise micro displacement platform is used to realize the movement control of the transmission Optical Fiber, and thus the precise control of the cavity length of the Optical Fiber Fabry-Perot cavity is realized. The large range adjustment and precise control of the cavity length are realized, and the method is used for providing a standard cavity length in the process of developing demodulation equipment.
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Optical Fiber f p fabry perot cavity pressure sensor with temperature self compensation
2014Co-Authors: Duan Yupei, Zhang Huijun, Liu Chunhong, Zhang LizheAbstract:The invention belongs to the technical field of Optical Fiber sensing, and relates to an Optical Fiber F-P (Fabry-Perot) cavity pressure sensor with temperature self compensation. The F-P cavity pressure sensor with temperature self compensation adopts an Optical Fiber with an Optical grating as a transmission Optical Fiber and adopts an Optical F-P cavity as a pressure sensitive element, wherein the F-P cavity sensitive element is a non-intrinsic Optical Fiber F-P cavity, and the Optical Fiber gating and the Optical F-P cavity are connected in a mode of glue bonding or carbon dioxide laser welding. According to the mode of pressure sensing, the sensor is divided into side pressure type Optical Fiber F-P cavity pressure sensors with temperature self compensation and end pressure type Optical Fiber F-P cavity pressure sensors with temperature self compensation.
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Optical Fiber pressure sensor with temperature measurement function
2014Co-Authors: Zhang Huijun, Duan Yupei, Zhang Li, Huang CaixiaAbstract:The invention relates to the technical field of Optical Fiber pressure sensors, and particularly relates to an Optical Fiber pressure sensor with a temperature measurement function. The Optical Fiber pressure sensor provided by the invention is simple in structure, small in size, light in weight, high in sensitivity, adjustable and convenient in installation and use, and can be applied to the fields such as petroleum, aviation, chemical engineering and the like. Compared with the prior art, the Optical Fiber pressure sensor measures the temperature by using a semiconductor silicon temperature measuring layer, carries out real-time correction on a pressure measurement result of the sensor, improves a problem that a traditional Fiber bragg grating gradually weakens or even disappears in a high-temperature environment for a long time, and has higher measurement accuracy.
Fang Guocheng - One of the best experts on this subject based on the ideXlab platform.
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Optical Fiber fabry perot pressure sensor and manufacturing method thereof
2015Co-Authors: Jia Pinggang, Wu Bin, Liang Ting, Tan Qiulin, Xiong Jijun, Fang GuochengAbstract:The invention discloses a totally-quartz Optical Fiber fabry-perot pressure sensor which is simple to manufacture and low in cost, and a manufacturing method of the totally-quartz Optical Fiber fabry-perot pressure sensor. The method comprises the steps of processing quartz by the mechanical processing method; melting through high temperature flange; inserting a sleeve with an Optical Fiber into a reserved aperture; melting and fixing to form the totally-quartz Optical Fiber fabry-perot pressure sensor. All parts of the sensor are mechanically processed; the size of a film and the size of a fabry-perot size are easily controlled; the sensor is processed from quartz material, so that the temperature coefficients are small, and high temperature, strong acid and base and other complex and terrible environments can be adapted.
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Optical Fiber mems fabry perot acceleration sensor and manufacturing method thereof
2015Co-Authors: Jia Pinggang, Fang Guocheng, Hong Yingping, Liang Ting, Cao Qun, Xue Chenyang, Xiong Jijun, Liu Jun, Zhang WendongAbstract:The invention provides an Optical Fiber MEMS Fabry-Perot acceleration sensor and a manufacturing method thereof. The acceleration sensor is mainly composed of a shell, an Optical Fiber, an acceleration sensitive element and a pedestal. The shell, the acceleration sensitive element and the pedestal of the sensor are processed by adopting an MEMS technology. Fixing of the pedestal, the acceleration sensitive element and the shell is realized via an MEMS bonding technology. The Optical Fiber is fixed in an Optical Fiber bushing. Fixing of the Optical Fiber and the shell is realized via a fusion welding technology. A mass block is processed at the center of the acceleration sensitive element via the MEMS technology, and the mass block on the light emergent surface of the Optical Fiber and the acceleration sensitive element is arranged in parallel so that a Fabry-Perot cavity is formed, and high-sensitivity measurement can be realized. The Optical Fiber MEMS Fabry-Perot acceleration sensor has advantages of small size, mass production, great consistency, low temperature coefficient and high temperature resistance so that acceleration measurement under conventional and special environments can be met.
Shanshan Wang - One of the best experts on this subject based on the ideXlab platform.
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micro Optical Fiber ring mirror based all Fiber fabry perot resonant cavity
2009Co-Authors: Limin Tong, Zhifang Hu, Shanshan WangAbstract:The utility model discloses a micro-Optical Fiber ring mirror based all-Fiber Fabry-Perot resonant cavity, which mainly comprises three micro-Optical Fibers, wherein the first micro-Optical Fiber is made into a Fabry-Perot resonant cavity; the second micro-Optical Fiber is coupled with one end of the resonant cavity and used for inputting an Optical signal; and the third micro-Optical Fiber is coupled with the other end of the micro-Optical Fiber and used for collecting a resonance Optical signal in the resonant cavity. The all-Fiber Fabry-Perot resonant cavity has the characteristics of simple structure, miniaturization, good stability, easy control and adjustment, and the like.
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all Optical Fiber fabry perot resonant cavity based on micro Optical Fiber annular mirror and method for making same
2009Co-Authors: Limin Tong, Zhifang Hu, Shanshan WangAbstract:The invention discloses all-Fiber Fabry-Perot resonant cavity based on a micro Optical Fiber loop mirror and a preparation method thereof. The resonant cavity is mainly composed of three micro Optical Fibers, wherein the first micro Optical Fiber is prepared into the Fabry-Perot resonant cavity; the second micro Optical Fiber is coupled with one end of the resonant cavity and is used for inputting Optical signals; the third micro Optical Fiber is coupled with the other end of the resonant cavity and is used for collecting resonant Optical signals in the resonant cavity. The all-Fiber Fabry-Perot resonant cavity is simple in structure, and has the advantages of small size, good stability, easy control and regulation, and the like. At present, the obtained maximum Q value is 5700, the range of a free spectral range is from 0.5 to 2 nm, and the maximum extinction ratio is 18dB.
