The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Hai Xiao - One of the best experts on this subject based on the ideXlab platform.
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simultaneous measurement of temperature and pressure with cascaded extrinsic fabry Perot Interferometer and intrinsic fabry Perot Interferometer sensors
Optical Engineering, 2014Co-Authors: Yinan Zhang, Xinwei Lan, Lei Yuan, Jie Huang, Hai XiaoAbstract:This paper presents an approach for simultaneous measurement of temperature and pressure using miniaturized fiber inline sensors. The approach utilizes the cascaded optical fiber inline intrinsic Fabry–Perot Interferometer and extrinsic Fabry–Perot Interferometer as temperature and pressure sensing elements, respectively. A CO2 laser was used to create a loss between them to balance their reflection power levels. The multiplexed signals were demodulated using a Fast Fourier transform-based wavelength tracking method. Experimental results showed that the sensing system could measure temperature and pressure unambiguously in a pressure range of 0 to 6.895×105 Pa and a temperature range from 20°C to 700°C.
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Miniaturized optical fiber Fabry-Perot Interferometer fabricated by femtosecond laser irradiation and selective chemical etching
Advanced Fabrication Technologies for Micro Nano Optics and Photonics VII, 2014Co-Authors: Lei Yuan, Baokai Cheng, Hanzheng Wang, Xinwei Lan, Jie Liu, Jie Huang, Hai XiaoAbstract:A U-shaped optical fiber inline microchannel was fabricated by femtosecond laser irradiation and subsequent selective chemical wet etching. A high quality micro-cavity embedded inside the channel was obtained to construct a Fabry-Perot Interferometer (FPI). A fringe visibility of 20 dB in spectrum domain was achieved. High temperature survivability of this micro device was also demonstrated. The proposed assembly-free optical fiber inline Interferometer is attractive for sensing applications in high-temperature harsh environments.
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a coaxial cable fabry Perot Interferometer for sensing applications
Sensors, 2013Co-Authors: Jie Huang, Hai Xiao, Lei Hua, Jun Fan, Ming LuoAbstract:This paper reports a novel coaxial cable Fabry-Perot Interferometer for sensing applications. The sensor is fabricated by drilling two holes half-way into a coaxial cable. The device physics was described. The temperature and strain responses of the sensor were tested. The measurement error was calculated and analyzed.
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an extrinsic fabry Perot Interferometer based large strain sensor with high resolution
Measurement Science and Technology, 2010Co-Authors: Ying Huang, Tao Wei, Yinan Zhang, Zhi Zhou, Genda Chen, Hai XiaoAbstract:A three-layer packaged structure is proposed for an extrinsic Fabry?Perot Interferometer-based optical fiber sensor in order to produce high resolution for large strains. The resolutions of three data processing algorithms including interference frequency tracking, period tracking and phase tracking are investigated and compared. Laboratory tests indicate that the proposed sensor structure can measure a strain of up to ?120?000 ?? (?12%) with resolution as high as 10 ??. The sensor prototype is insensitive to fiber misalignment, enabling the study of progressive structural failures with an integrated use of the three algorithms.
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fringe visibility enhanced extrinsic fabry Perot Interferometer using a graded index fiber collimator
IEEE Photonics Journal, 2010Co-Authors: Yinan Zhang, Xinwei Lan, Tao Wei, Ying Huang, Genda Chen, Hai XiaoAbstract:We report a fringe visibility-enhanced extrinsic Fabry-Perot Interferometer (EFPI) by fusion splicing a quarter-pitch length of a graded-index fiber (GIF) to the lead-in single mode fiber (SMF). The performance of the GIF collimator is theoretically analyzed using a ray matrix model and experimentally verified through beam divergence angle measurements. The fringe visibility of the GIF-collimated EFPI is measured as a function of the cavity length and compared with that of a regular SMF-EFPI. At the cavity length of 500 m, the fringe visibility of the GIF-EFPI is 0.8, while that of the SMF-EFPI is only 0.2. The visibility-enhanced GIF-EFPI may provide a better signal-to-noise ratio (SNR) for applications where a large dynamic range is desired.
Tao Wei - One of the best experts on this subject based on the ideXlab platform.
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an extrinsic fabry Perot Interferometer based large strain sensor with high resolution
Measurement Science and Technology, 2010Co-Authors: Ying Huang, Tao Wei, Yinan Zhang, Zhi Zhou, Genda Chen, Hai XiaoAbstract:A three-layer packaged structure is proposed for an extrinsic Fabry?Perot Interferometer-based optical fiber sensor in order to produce high resolution for large strains. The resolutions of three data processing algorithms including interference frequency tracking, period tracking and phase tracking are investigated and compared. Laboratory tests indicate that the proposed sensor structure can measure a strain of up to ?120?000 ?? (?12%) with resolution as high as 10 ??. The sensor prototype is insensitive to fiber misalignment, enabling the study of progressive structural failures with an integrated use of the three algorithms.
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fringe visibility enhanced extrinsic fabry Perot Interferometer using a graded index fiber collimator
IEEE Photonics Journal, 2010Co-Authors: Yinan Zhang, Xinwei Lan, Tao Wei, Ying Huang, Genda Chen, Hai XiaoAbstract:We report a fringe visibility-enhanced extrinsic Fabry-Perot Interferometer (EFPI) by fusion splicing a quarter-pitch length of a graded-index fiber (GIF) to the lead-in single mode fiber (SMF). The performance of the GIF collimator is theoretically analyzed using a ray matrix model and experimentally verified through beam divergence angle measurements. The fringe visibility of the GIF-collimated EFPI is measured as a function of the cavity length and compared with that of a regular SMF-EFPI. At the cavity length of 500 m, the fringe visibility of the GIF-EFPI is 0.8, while that of the SMF-EFPI is only 0.2. The visibility-enhanced GIF-EFPI may provide a better signal-to-noise ratio (SNR) for applications where a large dynamic range is desired.
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temperature insensitive miniaturized fiber inline fabry Perot Interferometer for highly sensitive refractive index measurement
Optics Express, 2008Co-Authors: Tao Wei, Yukun Han, Hai-lung Tsai, Yanjun Li, Hai XiaoAbstract:We report a miniaturized fiber inline Fabry-Perot Interferometer (FPI), with an open micro-notch cavity fabricated by one-step fs laser micromachining, for highly sensitive refractive index measurement. The device was tested for measurement of the refractive indices of various liquids including isopropanol, acetone and methanol at room temperature, as well as the temperature-dependent refractive index of deionized water from 3 to 90°C. The sensitivity for measurement of refractive index change of water was 1163 nm/RIU at the wavelength of 1550 nm. The temperature cross-sensitivity of the device was about 1.1×10-6 RIU/°C. The small size, all-fiber structure, small temperature dependence, linear response and high sensitivity, make the device attractive for chemical and biological sensing.
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temperature insensitive miniaturized fiber inline fabry Perot Interferometer for highly sensitive refractive index measurement
Optics Express, 2008Co-Authors: Tao Wei, Hai-lung Tsai, Hai XiaoAbstract:We report a miniaturized fiber inline Fabry-Perot Interferometer (FPI), with an open micro-notch cavity fabricated by one-step fs laser micromachining, for highly sensitive refractive index measurement. The device was tested for measurement of the refractive indices of various liquids including isopropanol, acetone and methanol at room temperature, as well as the temperature-dependent refractive index of deionized water from 3 to 90 degrees C. The sensitivity for measurement of refractive index change of water was 1163 nm/RIU at the wavelength of 1550 nm. The temperature cross-sensitivity of the device was about 1.1x10(-6) RIU/degrees C. The small size, all-fiber structure, small temperature dependence, linear response and high sensitivity, make the device attractive for chemical and biological sensing.
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miniaturized fiber inline fabry Perot Interferometer fabricated with a femtosecond laser
Optics Letters, 2008Co-Authors: Tao Wei, Yukun Han, Hai-lung Tsai, Hai XiaoAbstract:We report a miniaturized inline Fabry-Perot Interferometer directly fabricated on a single-mode optical fiber with a femtosecond laser. The device had a loss of 16 dB and an interference visibility exceeding 14 dB. The device was tested and survived in high temperatures up to 1100°C. With an accessible cavity and all-glass structure, the new device is attractive for sensing applications in high-temperature harsh environments.
Xueguang Qiao - One of the best experts on this subject based on the ideXlab platform.
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co2 sensing at atmospheric pressure using fiber fabry Perot Interferometer
Optical Sensors 2017, 2017Co-Authors: Yelu He, Ruohui Wang, Yangfan Zhao, Shilei Shen, Xueguang QiaoAbstract:A Fabry–Perot Interferometer (FPI) for CO 2 gas sensing at atmospheric pressure is proposed and experimentally demonstrated. The gas sensing material is poly(ethyleneimine) (PEI)/poly(vinylalcohol) (PVA) compound, which exhibits reversible refrative index change upon absorption and release of CO 2 gas molecules. The FPI is fabricated by coating a PEI/P VA film with a thickness of 15μm film at the end face of a single-mode fiber (SMF). A well-confined interference spectrum with fringe contrast of 19.5 dB and free spectra range (FSR) of 33.15 nm is obtained. The proposed FPI sensor is sensitive to the CO 2 gas concentration change, and a sensitivity of 0.2833nm/PCT is obtained. The FPI sensor provides a solution in the development of low-cost and compact gas sensors for CO 2 leakage monitoring.
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gas refractometer based on a side open fiber optic fabry Perot Interferometer
Applied Optics, 2017Co-Authors: Ruohui Wang, Pingchao Huang, Jiawei He, Xueguang QiaoAbstract:In this paper, we present a gas refractometer based on an open cavity optical fiber Fabry–Perot Interferometer. The Fabry–Perot cavity is fabricated by sandwiching a short section of preprocessed side hole fiber between two single-mode fibers. A chemical etching process creates a side-open cavity through which gas can enter and leave freely. By tracking the wavelength shift of the fringe pattern, the measurement of the refractive index change of nitrogen can be realized. The experiment results show the gas RI sensitivity is up to 1290 nm/RIU.
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fringe visibility enhanced fabry Perot Interferometer and its application as gas refractometer
Sensors and Actuators B-chemical, 2016Co-Authors: Ruohui Wang, Zhangwe Liu, Xueguang QiaoAbstract:Abstract In this paper, we propose a gas refractometer based on a fringe visibility enhanced optical fiber Fabry-Perot Interferometer. The Fabry-Perot cavity is fabricated by cascading single mode fiber and capillary tubes with different inner diameters. Gas can enter and leave the cavity freely through the hole of the capillary tube. A graded index fiber based collimator is inserted in between the single mode fiber and capillary tube to compensate the light loss and improve the fringe visibility. The numerical simulation and experiment results of Fringe visibility enhancement are presented. Gas refractive index measurement using the proposed Interferometer is also demonstrated.
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gas refractometer based on optical fiber extrinsic fabry Perot Interferometer with open cavity
IEEE Photonics Technology Letters, 2015Co-Authors: Ruohui Wang, Xueguang QiaoAbstract:In this letter, we proposed a gas refractometer based on optical fiber Fabry–Perot Interferometer with an open cavity. The Fabry–Perot cavity is a short section capillary tube spliced between a single-mode fiber and a side-hole fiber (SHF). The unique cladding of the SHF enables gas entering or leaving the Fabry–Perot cavity freely. The measurement of pressure-induced refractive index change of nitrogen gas has been demonstrated by monitoring the wavelength shift of the interference pattern. The robust and microsize architecture make the Interferometer a good candidate for gas sensing applications.
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an optical fiber fabry Perot Interferometer sensor for simultaneous measurement of relative humidity and temperature
IEEE Sensors Journal, 2014Co-Authors: Xiaolei Zhang, Xueguang Qiao, Liutong Yuan, Libin Zhou, Manli HuAbstract:A simultaneous relative humidity (RH) and temperature sensor based on an optical fiber Fabry-Perot Interferometer is proposed and experimentally demonstrated. This sensor is constructed by splicing a short length of photonic crystal fiber (PCF) to single mode fiber and coating an ultrathin polyvinyl alcohol film to the PCFs cleaved surface. The total length of this sensing head is only ~110 μM and the compact size means it can be used flexibly in limited space and harsh environments. Experimental results demonstrate that this sensor can simultaneously measure the ambient RH and temperature by demodulating the power change and wavelength shift of reflection spectrum. Consequently, the advantages of compact size, low cost, high flexibility and stability, fast response, and simultaneous RH and temperature measurement ability means the proposed sensor has an extensive range of potential applications.
Hai-lung Tsai - One of the best experts on this subject based on the ideXlab platform.
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temperature insensitive miniaturized fiber inline fabry Perot Interferometer for highly sensitive refractive index measurement
Optics Express, 2008Co-Authors: Tao Wei, Hai-lung Tsai, Hai XiaoAbstract:We report a miniaturized fiber inline Fabry-Perot Interferometer (FPI), with an open micro-notch cavity fabricated by one-step fs laser micromachining, for highly sensitive refractive index measurement. The device was tested for measurement of the refractive indices of various liquids including isopropanol, acetone and methanol at room temperature, as well as the temperature-dependent refractive index of deionized water from 3 to 90 degrees C. The sensitivity for measurement of refractive index change of water was 1163 nm/RIU at the wavelength of 1550 nm. The temperature cross-sensitivity of the device was about 1.1x10(-6) RIU/degrees C. The small size, all-fiber structure, small temperature dependence, linear response and high sensitivity, make the device attractive for chemical and biological sensing.
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temperature insensitive miniaturized fiber inline fabry Perot Interferometer for highly sensitive refractive index measurement
Optics Express, 2008Co-Authors: Tao Wei, Yukun Han, Hai-lung Tsai, Yanjun Li, Hai XiaoAbstract:We report a miniaturized fiber inline Fabry-Perot Interferometer (FPI), with an open micro-notch cavity fabricated by one-step fs laser micromachining, for highly sensitive refractive index measurement. The device was tested for measurement of the refractive indices of various liquids including isopropanol, acetone and methanol at room temperature, as well as the temperature-dependent refractive index of deionized water from 3 to 90°C. The sensitivity for measurement of refractive index change of water was 1163 nm/RIU at the wavelength of 1550 nm. The temperature cross-sensitivity of the device was about 1.1×10-6 RIU/°C. The small size, all-fiber structure, small temperature dependence, linear response and high sensitivity, make the device attractive for chemical and biological sensing.
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miniaturized fiber inline fabry Perot Interferometer fabricated with a femtosecond laser
Optics Letters, 2008Co-Authors: Tao Wei, Yukun Han, Hai-lung Tsai, Hai XiaoAbstract:We report a miniaturized inline Fabry-Perot Interferometer directly fabricated on a single-mode optical fiber with a femtosecond laser. The device had a loss of 16 dB and an interference visibility exceeding 14 dB. The device was tested and survived in high temperatures up to 1100°C. With an accessible cavity and all-glass structure, the new device is attractive for sensing applications in high-temperature harsh environments.
Changrui Liao - One of the best experts on this subject based on the ideXlab platform.
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simultaneous measurement of pressure and temperature by employing fabry Perot Interferometer based on pendant polymer droplet
Optics Express, 2015Co-Authors: Bing Sun, Junle Qu, Changrui Liao, Guolu Yin, Jun He, Jiangtao Zhou, Shen Liu, Jian Tang, Yiping Wang, Zhengyong LiAbstract:We investigated a novel and ultracompact polymer-capped Fabry-Perot Interferometer, which is based on a polymer capped on the endface of a single mode fiber (SMF). The proposed Fabry-Perot Interferometer has advantages of easy fabrication, low cost, and high sensitivity. The variation of the Fabry-Perot cavity length can be easily controlled by using the motors of a normal arc fusion splicer. Moreover, the enhanced mechanical strength of the Fabry-Perot Interferometer makes it suitable for high sensitivity pressure and temperature sensing in harsh environments. The proposed Interferometer exhibits a wavelength shift of the interference fringes that corresponds to a temperature sensitivity of 249 pm/°C and a pressure sensitivity of 1130 pm/MPa, respectively, around the wavelength of 1560 nm.
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sub micron silica diaphragm based fiber tip fabry Perot Interferometer for pressure measurement
Optics Letters, 2014Co-Authors: Changrui Liao, Shen Liu, Zhengyong Li, Lei Xu, Chao Wang, Qiao Wang, Yiping Wang, Dongning WangAbstract:We demonstrate a sub-micron silica diaphragm-based fiber-tip Fabry–Perot Interferometer for pressure sensing applications. The thinnest silica diaphragm, with a thickness of ∼320 nm, has been achieved by use of an improved electrical arc discharge technique. Such a sub-micron silica diaphragm breaks the sensitivity limitation imposed by traditional all-silica Fabry–Perot interferometric pressure sensors and, as a result, a high pressure sensitivity of ∼1036 pm/MPa at 1550 nm and a low temperature cross-sensitivity of ∼960 Pa/°C are achieved when a silica diaphragm of ∼500 nm in thickness is used. Moreover, the all-silica spherical structure enhanced the mechanical strength of the micro-cavity sensor, making it suitable for high sensitivity pressure sensing in harsh environments.
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high sensitivity strain sensor based on in fiber improved fabry Perot Interferometer
Optics Letters, 2014Co-Authors: Shen Liu, Changrui Liao, Jiangtao Zhou, Zhengyong Li, Qiao Wang, Yiping Wang, Guanjun Wang, Kaiming Yang, Xiaoyong Zhong, Jing ZhaoAbstract:We demonstrated a high-sensitivity strain sensor based on an in-fiber Fabry–Perot Interferometer (FPI) with an air cavity, which was created by splicing together two sections of standard single-mode fibers. The sensitivity of this strain sensor was enhanced to 6.0 pm/μe by improving the cavity length of the FPI by means of repeating arc discharges for reshaping the air cavity. Moreover, such a strain sensor has a very low temperature sensitivity of 1.1 pm/°C, which reduces the cross sensitivity between tensile strain and temperature.
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fabry Perot Interferometer sensor fabricated by femtosecond laser for hydrogen sensing
IEEE Photonics Technology Letters, 2013Co-Authors: Min Wang, Changrui Liao, Minghong Yang, Jie Cheng, Guilin Zhang, D N WangAbstract:In this letter, an optical fiber hydrogen sensor based on a Fabry-Perot Interferometer cavity fabricated by femtosecond laser micromachining near the fiber end and deposited with Pd film is proposed. The relationship between the reflection spectrum and the hydrogen concentration is simulated, and experimentally demonstrated. The shifts of the Interferometer output spectrum are 10, 30, 100, and 150 pm respectively, corresponding to the hydrogen concentration of 2%, 4%, 6%, and 8%, respectively. The proposed sensor is compact, easy in fabrication, and has high potential for hydrogen detection.
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optical fiber fabry Perot Interferometer cavity fabricated by femtosecond laser micromachining and fusion splicing for refractive index sensing
Optics Express, 2012Co-Authors: Changrui Liao, Tianyi Hu, Dongning WangAbstract:We demonstrate a fiber in-line Fabry-Perot Interferometer cavity sensor for refractive index measurement. The Interferometer cavity is formed by drilling a micro-hole at the cleaved fiber end facet, followed by fusion splicing. A micro-channel is inscribed by femtosecond laser micromachining to vertically cross the cavity to allow liquid to flow in. The refractive index sensitivity obtained is ~994 nm/RIU (refractive index unit). Such a device is simple in configuration, easy for fabrication and reliable in operation due to extremely low temperature cross sensitivity of ~4.8 × 10−6 RIU/°C.