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Tiegen Liu - One of the best experts on this subject based on the ideXlab platform.

  • fiber optical temperature compensated anemometer based on dual fabry perot sensors with sealed cavity
    Optics Express, 2019
    Co-Authors: Chao Wang, Rundong Wang, Yuanyao Li, Junfeng Jiang, Kun Liu, Xuezhi Zhang, Shuang Wang, Tiegen Liu
    Abstract:

    A fiber optical anemometer using dual Fabry-Perot sensors with sealed cavity is proposed for high-speed airflow measurement. The airflow velocity is measured based on principle of Differential Pressure, and temperature compensation is realized by reference F-P sensor to improve measurement accuracy and environmental adaptability. The location of dual F-P sensors in the airflow field and quadratic functional relation between Differential Pressure and airflow velocity are obtained by the simulation of turbulence model. F-P sensors in this experiment can be employed to measure Pressure from 100kPa to 107kPa and temperature from 5°C to 50°C. The full-scale error of F-P sensors is less than 0.53% by calibration. It is demonstrated experimentally this fiber optical anemometer is qualified for measuring air velocity in the range of 7.9-81m/s with velocity error less than 0.69%. The device has the potential to measure high speed airflow in various applications.

  • Differential Pressure based fiber optic temperature sensor using fabry perot interferometry
    Optics Letters, 2015
    Co-Authors: Tiegen Liu, Jinde Yin, Junfeng Jiang, Kun Liu, Shuang Wang, Shengliang Zou
    Abstract:

    We propose a novel fiber-optic Fabry–Perot interferometric (FFPI) temperature sensor based on Differential Pressure resulting from thermal expansion of sealed air. A thin silicon diaphragm is sandwiched between two micro-circular cavity-structured Pyrex plates to construct a FP and an air cavity. The thermal expansion of sealed air induces Differential Pressure variation between cavities and thus the deformation of thin diaphragm, which transfers temperature change into cavity length shift of FP interferometer. Theory analysis results indicate that the temperature-sensitivity can be designed flexibly by choosing the parameters of radius and thickness of silicon diaphragm, and the Differential Pressure between two cavities. Experimental results demonstrate that the temperature sensitivity of 6.07 nm/°C is achieved with the resolution of 0.10°C under the range of −50°C to 100°C, and the response time is around 1.3 s with temperature change from 28°C to 100°C.

Chen Mingqiang - One of the best experts on this subject based on the ideXlab platform.

  • double piston symmetric damping type optical fiber Differential Pressure sensor probe
    2015
    Co-Authors: Hu Hao, Zhong Liqiong, Chen Mingqiang
    Abstract:

    The invention provides a double-piston symmetric damping type optical fiber Differential Pressure sensor probe. The double-piston symmetric damping type optical fiber Differential Pressure sensor probe comprises a shell; the shell is of a cylindrical structure; two ends of the shell are respectively provided with an end cover in a sealed manner; the middle of the interior of the shell is provided with a separation board which divides the interior of the shell into a left cavity and a right cavity in a sealed manner; the shell is provided with fluid through holes which are located at two sides of the separation board; a piston is slidingly arranged in the cavities at the two sides of the separation board respectively in a sealed manner; a spring is arranged between each piston and the end cover located at one side where the piston is located; a probe accommodating hole which is communicated with each end cover is formed in the corresponding end cover, and is vertical to the piston which is corresponding to the probe accommodating hole; and an optical fiber probe is arranged in each probe accommodating hole; and the pistons are provided with light reflecting sheets which are aligned with the optical fiber probes. With the double-piston symmetric damping type optical fiber Differential Pressure sensor probe of the invention adopted, the problems of unsuitability for many occasions, poor practicability and incapability of satisfying actual Differential Pressure measurement requirements of an existing Differential Pressure sensor can be solved. The double-piston symmetric damping type optical fiber Differential Pressure sensor probe provided by the invention belongs to the Differential Pressure detection field.

  • symmetric damping type optical fiber Differential Pressure transducer provided with double pistons
    2015
    Co-Authors: Hu Hao, Zhong Liqiong, Chen Mingqiang
    Abstract:

    The invention provides a symmetric damping type optical fiber Differential Pressure transducer provided with double pistons. A transducer probe comprises a casing adopting a cylindrical structure, end covers are arranged at two ends of the casing in a sealed manner respectively, a separating plate for separating the inside of the casing into left and right cavities in a sealed manner is arranged in the middle of the inside of the casing, fluid through holes are formed in the casing on two sides of the separating plate respectively, the pistons are arranged in the cavities on two sides of the separating plate, springs are also arranged between the pistons and the end covers, probe accommodating holes are formed in the end covers and are perpendicular to the pistons, an optical fiber probe is arranged in each probe accommodating hole, a reflecting piece is arranged in a position, directly facing the corresponding optical fiber probe, of each piston, each of outgoing optical fibers at two ends of the casing and on the optical fiber probes is connected with one photoelectric detector, and the two photoelectric detectors are connected with a signal processor respectively. Thus, problems that existing Differential Pressure transducers are inapplicable in many places, are poor in practicability and cannot meet actual Differential Pressure measurement requirements are solved. The invention belongs to the field of Differential Pressure detection.

Hu Hao - One of the best experts on this subject based on the ideXlab platform.

  • double piston symmetric damping type optical fiber Differential Pressure sensor probe
    2015
    Co-Authors: Hu Hao, Zhong Liqiong, Chen Mingqiang
    Abstract:

    The invention provides a double-piston symmetric damping type optical fiber Differential Pressure sensor probe. The double-piston symmetric damping type optical fiber Differential Pressure sensor probe comprises a shell; the shell is of a cylindrical structure; two ends of the shell are respectively provided with an end cover in a sealed manner; the middle of the interior of the shell is provided with a separation board which divides the interior of the shell into a left cavity and a right cavity in a sealed manner; the shell is provided with fluid through holes which are located at two sides of the separation board; a piston is slidingly arranged in the cavities at the two sides of the separation board respectively in a sealed manner; a spring is arranged between each piston and the end cover located at one side where the piston is located; a probe accommodating hole which is communicated with each end cover is formed in the corresponding end cover, and is vertical to the piston which is corresponding to the probe accommodating hole; and an optical fiber probe is arranged in each probe accommodating hole; and the pistons are provided with light reflecting sheets which are aligned with the optical fiber probes. With the double-piston symmetric damping type optical fiber Differential Pressure sensor probe of the invention adopted, the problems of unsuitability for many occasions, poor practicability and incapability of satisfying actual Differential Pressure measurement requirements of an existing Differential Pressure sensor can be solved. The double-piston symmetric damping type optical fiber Differential Pressure sensor probe provided by the invention belongs to the Differential Pressure detection field.

  • symmetric damping type optical fiber Differential Pressure transducer provided with double pistons
    2015
    Co-Authors: Hu Hao, Zhong Liqiong, Chen Mingqiang
    Abstract:

    The invention provides a symmetric damping type optical fiber Differential Pressure transducer provided with double pistons. A transducer probe comprises a casing adopting a cylindrical structure, end covers are arranged at two ends of the casing in a sealed manner respectively, a separating plate for separating the inside of the casing into left and right cavities in a sealed manner is arranged in the middle of the inside of the casing, fluid through holes are formed in the casing on two sides of the separating plate respectively, the pistons are arranged in the cavities on two sides of the separating plate, springs are also arranged between the pistons and the end covers, probe accommodating holes are formed in the end covers and are perpendicular to the pistons, an optical fiber probe is arranged in each probe accommodating hole, a reflecting piece is arranged in a position, directly facing the corresponding optical fiber probe, of each piston, each of outgoing optical fibers at two ends of the casing and on the optical fiber probes is connected with one photoelectric detector, and the two photoelectric detectors are connected with a signal processor respectively. Thus, problems that existing Differential Pressure transducers are inapplicable in many places, are poor in practicability and cannot meet actual Differential Pressure measurement requirements are solved. The invention belongs to the field of Differential Pressure detection.

  • reflective optical fiber bundle Differential Pressure sensor with intensity compensation
    2014
    Co-Authors: Hu Hao, Zhong Liqiong, Zhou Qian, Zhang Dabin, Cao Yang
    Abstract:

    The utility model discloses a reflective optical-fiber-bundle Differential Pressure sensor with intensity compensation. One surface of one elastic film (113) is impacted by the Pressure which is generated by detected fluid, and narrow-spectrum laser is used to illuminate the other surface of the elastic film (113), so that the elastic film (113) is deformed; and after the elastic film (113) is deformed, the output luminous intensity of one receiving fiber (41) is changed thereupon, and the variance of the output luminous intensity of a receiving fiber (42) is detected to determine the Pressure variance of the elastic film (113) caused by the detected fluid. Thus, the sensor is relatively high in sensing accuracy, reliable in performance, simple in structure, low in volume and weight, and low in the production cost.

Shengliang Zou - One of the best experts on this subject based on the ideXlab platform.

  • Differential Pressure based fiber optic temperature sensor using fabry perot interferometry
    Optics Letters, 2015
    Co-Authors: Tiegen Liu, Jinde Yin, Junfeng Jiang, Kun Liu, Shuang Wang, Shengliang Zou
    Abstract:

    We propose a novel fiber-optic Fabry–Perot interferometric (FFPI) temperature sensor based on Differential Pressure resulting from thermal expansion of sealed air. A thin silicon diaphragm is sandwiched between two micro-circular cavity-structured Pyrex plates to construct a FP and an air cavity. The thermal expansion of sealed air induces Differential Pressure variation between cavities and thus the deformation of thin diaphragm, which transfers temperature change into cavity length shift of FP interferometer. Theory analysis results indicate that the temperature-sensitivity can be designed flexibly by choosing the parameters of radius and thickness of silicon diaphragm, and the Differential Pressure between two cavities. Experimental results demonstrate that the temperature sensitivity of 6.07 nm/°C is achieved with the resolution of 0.10°C under the range of −50°C to 100°C, and the response time is around 1.3 s with temperature change from 28°C to 100°C.

Ming Han - One of the best experts on this subject based on the ideXlab platform.

  • fiber optic temperature sensor using dual fabry perot cavities filled with gas of different Pressure
    Sensors and Actuators A-physical, 2017
    Co-Authors: Yujie Lu, Ming Han
    Abstract:

    Abstract We present a fiber-optic temperature sensor based on dual Fabry-Perot cavities formed at the end of a multicore fiber and filled will with gas of Differential Pressure. Making use of the unique relationship of the refractive index of a gas to its Pressure and absolute temperature, a theoretical model is developed to extract the absolute temperature from the Differential shifts of the spectral fringes from the two cavities. The demodulation of the sensor is inherently insensitive to the strain applied on the sensor. In addition, the sensor has excellent stability due to the use of gas, which has stable optical properties even at elevated temperature, as the sensing element. Such a sensor was fabricated with dual cavities filled with air of a Differential Pressure of 1000 psi and the sensor is tested for measurement of absolute temperatures up to 900 K (627 °C). The sensor performance in terms of accuracy, resolution, cross-sensitivity to strain, and stability are studied.