The Experts below are selected from a list of 55566 Experts worldwide ranked by ideXlab platform
Perry Ping Shum - One of the best experts on this subject based on the ideXlab platform.
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highly sensitive refractive index sensor based on cascaded microfiber knots with vernier effect
Optics Express, 2015Co-Authors: Qizhen Sun, Perry Ping Shum, Deming Liu, Yiyang Luo, Lin ZhangAbstract:We propose and experimentally demonstrate a refractive index (RI) sensor based on cascaded microfiber knot resonators (CMKRs) with Vernier effect. Deriving from high proportional evanescent Field of microfiber and spectrum magnification function of Vernier effect, the RI sensor shows high sensitivity as well as high detection resolution. By using the method named “Drawing-Knotting-Assembling (DKA)”, a compact CMKRs is fabricated for experimental demonstration. With the assistance of Lorentz fitting algorithm on the transmission spectrum, sensitivity of 6523nm/RIU and detection resolution up to 1.533 × 10−7RIU are obtained in the experiment which show good agreement with the numerical simulation. The proposed all-fiber RI sensor with high sensitivity, compact size and low cost can be widely used for chemical and biological detection, as well as the electronic/Magnetic Field Measurement.
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Magnetic Field sensing with reflectivity ratio Measurement of fiber bragg grating
IEEE Sensors Journal, 2015Co-Authors: Jingyi Yang, Chi Chiu Chan, Yangzi Zheng, Xinyong Dong, Perry Ping ShumAbstract:A simple Magnetic Field sensor by using an optical fiber Bragg grating (FBG) cascaded by a cleaved optical fiber end, which is surrounded with Magnetic fluid (MF), is experimentally demonstrated. Magnetic Field changes Fresnel reflectivity of the fiber end face through refractive index change of the MF, leading to a modulation to the reflection background in the reflection spectrum of the FBG. By comparing intensity difference between the FBG reflection peak, which is not sensitive to the external Magnetic Field, and the reflection background, Magnetic Field Measurement is achieved successfully. High accuracy and stability can be realized because influence of power level fluctuation of the optical source on Measurement results can be eliminated. Furthermore, temperature can be measured simultaneously from reflection wavelength shift of the FBG that is helpful to further compensate the effect of temperature on Magnetic Field Measurement.
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Optical fiber Magnetic Field sensor based on Magnetic fluid and microfiber mode interferometer
Optics Communications, 2015Co-Authors: Yangzi Zheng, Chi Chiu Chan, Xinyong Dong, Perry Ping Shum, Haibin SuAbstract:A Magnetic Field sensor is proposed based on the combination of Magnetic fluid (MF) and an optical microfiber mode interferometer (MMI). It is measured that the MMI is highly sensitive to ambient refractive index (RI) with a high sensitivity up to 16,539 nm/RIU while RI of the MF is changeable with an external Magnetic Field strength. By monitoring wavelength shift of transmission spectrum of the MMI, Magnetic Field Measurement is realized with a maximum sensitivity of -293 pm/Oe in the range of 0-220 Oe.
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cascaded fiber optic fabry perot interferometers with vernier effect for highly sensitive Measurement of axial strain and Magnetic Field
Optics Express, 2014Co-Authors: Peng Zhang, Ming Tang, Songnian Fu, Jun Ouyang, Perry Ping ShumAbstract:We report a highly sensitive fiber-optic sensor based on two cascaded intrinsic fiber Fabry-Perot interferometers (IFFPIs). The cascaded IFFPIs have different free spectral ranges (FSRs) and are formed by a short section of hollow core photonic crystal fiber sandwiched by two single mode fibers. With the superposition of reflective spectrum with different FSRs, the Vernier effect will be generated in the proposed sensor and we found that the strain sensitivity of the proposed sensor can be improved from 1.6 pm/μe for a single IFFPI sensor to 47.14 pm/μe by employing the Vernier effect. The sensor embed with a metglas ribbon can be also used to measure the Magnetic Field according to the similar principle. The sensitivity of the Magnetic Field Measurement is achieved to be 71.57 pm/Oe that is significantly larger than the 2.5 pm/Oe for a single IFFPI sensor.
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fabry perot interferometric sensor based on metglas ribbon and hollow core photonic crystal fiber for Magnetic Field Measurement
International Photonics and OptoElectronics Meetings (2014) paper FF4B.4, 2014Co-Authors: Peng Zhang, Perry Ping Shum, Ming Tang, Jun Ouyang, Feng Gao, Benpeng Zhu, Deming LiuAbstract:A fiber-optic Magnetic Field sensor utilizing in-line Fabry-Perot interferometer based on hollow-core photonic crystal fiber and metglas ribbon to measure Magnetic Field intensity is presented. The largest Magnetic Field sensitivity achieved is 2 pm/Oe.
Yong Zhao - One of the best experts on this subject based on the ideXlab platform.
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Magnetic Field Measurement based on the sagnac interferometer with a ferrofluid filled high birefringence photonic crystal fiber
IEEE Transactions on Instrumentation and Measurement, 2016Co-Authors: Yong ZhaoAbstract:A compact optical fiber Magnetic Field sensor based on the principle of the Sagnac interferometer is proposed. Different from the conventional ones, a ferrofluid-filled high-birefringence photonic crystal fiber (HB-PCF) is inserted into the Sagnac as a Magnetic Field sensing element. The refractive index of the ferrofluid filled in the cladding air holes of the HB-PCF will change with respect to the applied Magnetic Field, and subsequently, the birefringence of the HB-PCF will change, which will affect the shifts of the output interference spectrum in Sagnac. Experiments are carried out to verify the simulation model and the results indicate that the interference spectrum exhibits a red shift with the increment in the Magnetic Field intensity. The sensitivity of the proposed sensor is up to 0.073 nm/mT for a Magnetic Field intensity ranging from 10 to 40 mT, while the resolution is 0.001 mT. The proposed Magnetic Field sensor is attractive due to its compact size, low cost, and immunity to electroMagnetic interference beyond what conventional Magnetic Field sensors can offer.
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a novel current sensor based on Magnetic fluid and fiber loop cavity ring down technology
IEEE Sensors Journal, 2015Co-Authors: Ji Xia, Xu Liu, Yong ZhaoAbstract:A novel current sensing system, based on Magnetic fluid (MF) film and fiber loop cavity ring-down (CRD) technology, is proposed and demonstrated for the first time. In the sensing system, a MF film whose loss coefficient can be affected by Magnetic Field is inserted in the ring cavity as the sensitive device. The MF film is made by etching center of two glass slides and sealing MF with a volume concentration of $C=3.6$ % in it. This structure is used as the sensitive device in the ring cavity. In this paper, a fiber loop CRD sensing system has been established for electric current Measurement, and a theoretical model for optimizing coupling ratio of the two couplers in the ring cavity has been presented. The performances of the electric current sensor are evaluated by applying different Magnetic Fields generated by current to detect decay constants. It can be concluded from the experimental results that a Magnetic Field Measurement sensitivity of 0.00033 T/ $\mu \text{s}$ is reached, corresponding to a current Measurement sensitivity of 3.3 mA/ $\mu \text{s}$ . The current Measurement method based on CRD technology and MF provides a new way for research and applications in the Field of modern electrical engineering.
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Magnetic fluid filled optical fiber fabry perot sensor for Magnetic Field Measurement
IEEE Photonics Technology Letters, 2014Co-Authors: Yong Zhao, Dan Wang, Qi WangAbstract:Magnetic fluid is a new type of optical functional material, which has interesting optical characteristics under an external Magnetic Field. In this letter, the magneto-optical characteristic of the Magnetic fluid was adopted to form a novel fiber-optic Magnetic Field sensor. The sensor probe was composed of an extrinsic fiber Fabry-Perot interferometer and Magnetic fluid. The refractive index of the Magnetic fluid would be changed with the increase of Magnetic Field. Preliminary experiment was carried out to verify the feasibility of the sensor. The Magnetic Field Measurement sensitivity was 0.0431 nm/Gs in the experiment. The Measurement resolution was better than 0.5 Gs at the Measurement range from 0 to 400 Gs. The sensor has the advantages of simple structure, compact size, and easy fabrication.
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Fiber Optic Fabry-Perot Magnetic Field Sensor With Temperature Compensation Using a Fiber Bragg Grating
IEEE Transactions on Instrumentation and Measurement, 2014Co-Authors: Yong Zhao, Ri-qing Lv, Dan Wang, Qi WangAbstract:Based on the characteristic of Magnetic-controlled refractive index, Magnetic fluid was used as a sensitive medium in fiber optic Fabry-Perot (F-P) cavity. Combined with the temperature sensing property of fiber Bragg grating (FBG), a novel fiber optic F-P Magnetic Field sensor with temperature compensation was proposed. The sensor probe has the advantages of simple structure, low cost, and high Magnetic Field Measurement accuracy. Magnetic Field and temperature can be simultaneously measured by the proposed sensor. Sensing mechanism and experimental results indicated that the temperature cross effect on Magnetic Field Measurement can be effectively compensated using a FBG. The maximal Magnetic Field intensity is up to 600 Gs with a sensitivity of 0.04 nm/Gs and Measurement resolution is 0.5 Gs.
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hollow core photonic crystal fiber fabry perot sensor for Magnetic Field Measurement based on Magnetic fluid
Optics and Laser Technology, 2012Co-Authors: Yong Zhao, Yu YingAbstract:Abstract Based on the characteristic of Magnetic-controlling refractive index, the Magnetic fluid filled in hollow-core photonic crystal fiber (HC-PCF) can be used as the sensitive medium in the cavity of a fiber Fabry–Perot (F–P) Magnetic Field sensor. The structure and the sensor principle are introduced. The theoretical simulations of the mode distribution of the HC-PCF filled with the Magnetic fluid and the sensor output spectra are discussed in detail. The sensor multiplexing capability is indicated as well. Magnetic Field Measurement sensitivity is about 33 pm/Oe based on the proposed sensor.
Qi Wang - One of the best experts on this subject based on the ideXlab platform.
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A Magnetic Field Sensor Based on a Magnetic Fluid-Filled FP-FBG Structure.
Sensors (Basel Switzerland), 2016Co-Authors: Ji Xia, Hong Luo, Fuyin Wang, Qi Wang, Shuidong XiongAbstract:Based on the characteristic Magnetic-controlled refractive index property, in this paper, a Magnetic fluid is used as a sensitive medium to detect the Magnetic Field in the fiber optic Fabry-Perot (FP) cavity. The temperature compensation in fiber Fabry-Perot Magnetic sensor is demonstrated and achieved. The refractive index of the Magnetic fluid varies with the applied Magnetic Field and external temperature, and a cross-sensitivity effect of the temperature and Magnetic Field occurs in the Fabry-Perot Magnetic sensor and the accuracy of Magnetic Field Measurements is affected by the thermal effect. In order to overcome this problem, we propose a modified sensor structure. With a fiber Bragg grating (FBG) written in the insert fiber end of the Fabry-Perot cavity, the FBG acts as a temperature compensation unit for the Magnetic Field Measurement and it provides an effective solution to the cross-sensitivity effect. The experimental results show that the sensitivity of Magnetic Field detection improves from 0.23 nm/mT to 0.53 nm/mT, and the Magnetic Field Measurement resolution finally reaches 37.7 T. The temperature-compensated FP-FBG Magnetic sensor has obvious advantages of small volume and high sensitivity, and it has a good prospect in applications in the power industry and national defense technology areas.
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Magnetic fluid filled optical fiber fabry perot sensor for Magnetic Field Measurement
IEEE Photonics Technology Letters, 2014Co-Authors: Yong Zhao, Dan Wang, Qi WangAbstract:Magnetic fluid is a new type of optical functional material, which has interesting optical characteristics under an external Magnetic Field. In this letter, the magneto-optical characteristic of the Magnetic fluid was adopted to form a novel fiber-optic Magnetic Field sensor. The sensor probe was composed of an extrinsic fiber Fabry-Perot interferometer and Magnetic fluid. The refractive index of the Magnetic fluid would be changed with the increase of Magnetic Field. Preliminary experiment was carried out to verify the feasibility of the sensor. The Magnetic Field Measurement sensitivity was 0.0431 nm/Gs in the experiment. The Measurement resolution was better than 0.5 Gs at the Measurement range from 0 to 400 Gs. The sensor has the advantages of simple structure, compact size, and easy fabrication.
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Fiber Optic Fabry-Perot Magnetic Field Sensor With Temperature Compensation Using a Fiber Bragg Grating
IEEE Transactions on Instrumentation and Measurement, 2014Co-Authors: Yong Zhao, Ri-qing Lv, Dan Wang, Qi WangAbstract:Based on the characteristic of Magnetic-controlled refractive index, Magnetic fluid was used as a sensitive medium in fiber optic Fabry-Perot (F-P) cavity. Combined with the temperature sensing property of fiber Bragg grating (FBG), a novel fiber optic F-P Magnetic Field sensor with temperature compensation was proposed. The sensor probe has the advantages of simple structure, low cost, and high Magnetic Field Measurement accuracy. Magnetic Field and temperature can be simultaneously measured by the proposed sensor. Sensing mechanism and experimental results indicated that the temperature cross effect on Magnetic Field Measurement can be effectively compensated using a FBG. The maximal Magnetic Field intensity is up to 600 Gs with a sensitivity of 0.04 nm/Gs and Measurement resolution is 0.5 Gs.
Chi Chiu Chan - One of the best experts on this subject based on the ideXlab platform.
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fiber optic fabry perot optofluidic sensor with a focused ion beam ablated microslot for fast refractive index and Magnetic Field Measurement
IEEE Journal of Selected Topics in Quantum Electronics, 2017Co-Authors: Yangzi Zheng, Xinyong Dong, Li Han Chen, Jingyi Yang, Ravikumar Raghunandhan, Ping Lam So, Chi Chiu ChanAbstract:A compact fiber-optic Fabry–Perot interferometric sensor with an embedded microfluidic channel for static Magnetic Field Measurement is proposed and implemented. Fabrication of the Fabry–Perot structure involved cascading two silica capillary tubes with different inner diameters, followed by milling of a microslot directly on the sidewall of the large inner diameter silica capillary tube, by focused ion beam micromachining. The microslot, together with the hollow structure of the small inner diameter silica capillary tubes forms an open Fabry–Perot cavity to function as a microfluidic channel. The microslot was found to improve the response time of the Fabry–Perot sensor to changes in refractive index (RI) of the cavity. Magnetic fluid was introduced in the Fabry–Perot cavity, thereby, enabling implementation of an optofluidics system for Magnetic Field Measurement. The sensing scheme is based on the Magnetic Field strength induced RI change of the Magnetic fluid which in turn modulates the interference spectrum of the sensor. Wavelength shifts were monitored real time for the continuous Measurement of Magnetic Field strength. The sensor calibration curves with respect to Magnetic Field were plotted and the sensor exhibits a relative high Magnetic Field sensitivity of ∼418.7 pm/Oe relative to the dip wavelength around 1590 nm.
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Magnetic Field sensing with reflectivity ratio Measurement of fiber bragg grating
IEEE Sensors Journal, 2015Co-Authors: Jingyi Yang, Chi Chiu Chan, Yangzi Zheng, Xinyong Dong, Perry Ping ShumAbstract:A simple Magnetic Field sensor by using an optical fiber Bragg grating (FBG) cascaded by a cleaved optical fiber end, which is surrounded with Magnetic fluid (MF), is experimentally demonstrated. Magnetic Field changes Fresnel reflectivity of the fiber end face through refractive index change of the MF, leading to a modulation to the reflection background in the reflection spectrum of the FBG. By comparing intensity difference between the FBG reflection peak, which is not sensitive to the external Magnetic Field, and the reflection background, Magnetic Field Measurement is achieved successfully. High accuracy and stability can be realized because influence of power level fluctuation of the optical source on Measurement results can be eliminated. Furthermore, temperature can be measured simultaneously from reflection wavelength shift of the FBG that is helpful to further compensate the effect of temperature on Magnetic Field Measurement.
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Optical fiber Magnetic Field sensor based on Magnetic fluid and microfiber mode interferometer
Optics Communications, 2015Co-Authors: Yangzi Zheng, Chi Chiu Chan, Xinyong Dong, Perry Ping Shum, Haibin SuAbstract:A Magnetic Field sensor is proposed based on the combination of Magnetic fluid (MF) and an optical microfiber mode interferometer (MMI). It is measured that the MMI is highly sensitive to ambient refractive index (RI) with a high sensitivity up to 16,539 nm/RIU while RI of the MF is changeable with an external Magnetic Field strength. By monitoring wavelength shift of transmission spectrum of the MMI, Magnetic Field Measurement is realized with a maximum sensitivity of -293 pm/Oe in the range of 0-220 Oe.
Deming Liu - One of the best experts on this subject based on the ideXlab platform.
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highly sensitive refractive index sensor based on cascaded microfiber knots with vernier effect
Optics Express, 2015Co-Authors: Qizhen Sun, Perry Ping Shum, Deming Liu, Yiyang Luo, Lin ZhangAbstract:We propose and experimentally demonstrate a refractive index (RI) sensor based on cascaded microfiber knot resonators (CMKRs) with Vernier effect. Deriving from high proportional evanescent Field of microfiber and spectrum magnification function of Vernier effect, the RI sensor shows high sensitivity as well as high detection resolution. By using the method named “Drawing-Knotting-Assembling (DKA)”, a compact CMKRs is fabricated for experimental demonstration. With the assistance of Lorentz fitting algorithm on the transmission spectrum, sensitivity of 6523nm/RIU and detection resolution up to 1.533 × 10−7RIU are obtained in the experiment which show good agreement with the numerical simulation. The proposed all-fiber RI sensor with high sensitivity, compact size and low cost can be widely used for chemical and biological detection, as well as the electronic/Magnetic Field Measurement.
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fabry perot interferometric sensor based on metglas ribbon and hollow core photonic crystal fiber for Magnetic Field Measurement
International Photonics and OptoElectronics Meetings (2014) paper FF4B.4, 2014Co-Authors: Peng Zhang, Perry Ping Shum, Ming Tang, Jun Ouyang, Feng Gao, Benpeng Zhu, Deming LiuAbstract:A fiber-optic Magnetic Field sensor utilizing in-line Fabry-Perot interferometer based on hollow-core photonic crystal fiber and metglas ribbon to measure Magnetic Field intensity is presented. The largest Magnetic Field sensitivity achieved is 2 pm/Oe.
