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Dongning Wang - One of the best experts on this subject based on the ideXlab platform.

  • optical fiber fabry perot interferometer based on an Air Cavity for gas pressure sensing
    IEEE Photonics Journal, 2017
    Co-Authors: Ben Xu, Yaming Liu, Dongning Wang, Dagong Jia
    Abstract:

    An optical fiber Fabry–Perot interferometer (FPI) based on an Air Cavity with a microchannel is proposed and demonstrated for gas pressure measurement. The inner Air Cavity is fabricated by fusion splicing a single-mode fiber (SMF) with a microhole at the end facet to another section of SMF, then creating a microchannel to vertically cross the Air Cavity to allow gas to flow in. As the Air Cavity is cascaded to a short section of SMF, a three-beam interference pattern is produced, which shifts with the gas pressure variation in the inner Air Cavity due to the refractive index change of the gas. In order to compensate the temperature effect, the multiple-dip tracing technique and the Fourier band pass filtering (FBPF) method are used simultaneously for gas pressure and temperature measurement. It is also found that by using the FBPF method, the gas pressure sensitivity does not depend on the resonant peaks/dips selected in the filtered spectrum of the device. The proposed device has a robust tip structure, miniature size, and high sensitivity (∼4.028 nm/MPa) and is easy to fabricate, which makes it attractive for highly sensitive and precise gas pressure measurement.

  • fiber in line mach zehnder interferometer based on an inner Air Cavity for high pressure sensing
    Optics Letters, 2015
    Co-Authors: W Talataisong, Dongning Wang, Changrui Liao, Ratchapak Chitaree, Chao Wang
    Abstract:

    We demonstrate a fiber in-line Mach–Zehnder interferometer based on an inner Air-Cavity with open micro-channel for high-pressure sensing applications. The inner Air-Cavity is fabricated by combining femtosecond laser micromachining and the fusion splicing technique. The micro-channel is drilled on the top of the inner Air-Cavity to allow the high-pressure gas to flow in. The fiber in-line device is miniature, robust, and stable in operation and exhibits a high pressure sensitivity of ∼8,239  pm/MPa.

  • microfiber in line mach zehnder interferometer for strain sensing
    Optics Letters, 2013
    Co-Authors: Changrui Liao, Dongning Wang, Ying Wang
    Abstract:

    An elegant way of achieving an ultracompact optical fiber in-line Mach–Zehnder interferometer is to create an inner Air Cavity in a section of microfiber. The sandwich structure splits the light propagating in the fiber into two beams: one passes through the inner Air Cavity and the other travels along the silica wall of the Cavity before recombining at the Cavity end, resulting in an interference fringe pattern. Such a device is applied for strain measurement with a high sensitivity of 6.8  pm/μe.

  • miniaturized fiber in line mach zehnder interferometer based on inner Air Cavity for high temperature sensing
    Optics Letters, 2012
    Co-Authors: Ying Wang, Changrui Liao, Dongning Wang
    Abstract:

    We demonstrate a miniaturized fiber in-line Mach–Zehnder interferometer based on an inner Air Cavity adjacent to the fiber core for high-temperature sensing. The inner Air Cavity is fabricated by femtosecond laser micromachining and the fusion splicing technique. Such a device is robust and insensitive to ambient refractive index change, and has high temperature sensitivity of ∼43.2  pm/°C, up to 1000°C, and low cross sensitivity to strain.

  • Fiber-tip micro-Cavity for temperature and transverse load sensing
    Optics Express, 2011
    Co-Authors: Jun Ma, Jian Ju, Long Jin, Dongning Wang
    Abstract:

    A low cost fiber-optic micro-Cavity interferometric sensor is presented. The micro-Cavity is fabricated at the fiber tip by splicing a silica capillary to a single mode fiber and then heating/melting the capillary to form a microsphere with an internal Air Cavity. Applications of the micro-Cavity sensor for temperature and traverse load measurements are demonstrated. The sensor has small size and good mechanical strength, and may be used in high temperature environment.

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

  • absolute single Cavity length interrogation of fiber optic compound fabry perot pressure sensors through a white light non scanning correlation method
    Sensors, 2019
    Co-Authors: Zilong Guo, Wentao Lv, Xiongxing Zhang, Qingqing Chen, Wei Wang, Haibin Chen
    Abstract:

    A white light non-scanning correlation interrogation system was proposed and built to interrogate absolute length of the Air Cavity of fiber-optic compound Fabry–Perot pressure sensors for the extraction of pressure value. By carefully choosing thickness range and tilt angle of the optical wedge used for Cavity length matching, correlation interferometric signal of the basal Cavity can be naturally filtered out. Based on peak positioning by Fourier transform, bandpass filtering in frequency domain, inverse Fourier transform back to time domain, envelope fitting and zero fringe finding through a gravity center method, Cavity length can be determined with an accuracy of 0.04%. The system was used for the interrogation of a fiber-optic compound Fabry–Perot pressure sensor under different pressures. For a pressure range of 0.1~2.9 Mpa, the linear relationship between the Air Cavity length and the gas pressure imposed was successfully extracted.

  • Absolute Single Cavity Length Interrogation of Fiber-Optic Compound Fabry–Perot Pressure Sensors Through a White Light Non-Scanning Correlation Method
    Sensors, 2019
    Co-Authors: Zilong Guo, Wentao Lv, Xiongxing Zhang, Haibin Chen, Qingqing Chen, Wei Wang, Zhibo Ma
    Abstract:

    A white light non-scanning correlation interrogation system was proposed and built to interrogate absolute length of the Air Cavity of fiber-optic compound Fabry–Perot pressure sensors for the extraction of pressure value. By carefully choosing thickness range and tilt angle of the optical wedge used for Cavity length matching, correlation interferometric signal of the basal Cavity can be naturally filtered out. Based on peak positioning by Fourier transform, bandpass filtering in frequency domain, inverse Fourier transform back to time domain, envelope fitting and zero fringe finding through a gravity center method, Cavity length can be determined with an accuracy of 0.04%. The system was used for the interrogation of a fiber-optic compound Fabry–Perot pressure sensor under different pressures. For a pressure range of 0.1~2.9 Mpa, the linear relationship between the Air Cavity length and the gas pressure imposed was successfully extracted.

Zilong Guo - One of the best experts on this subject based on the ideXlab platform.

  • absolute single Cavity length interrogation of fiber optic compound fabry perot pressure sensors through a white light non scanning correlation method
    Sensors, 2019
    Co-Authors: Zilong Guo, Wentao Lv, Xiongxing Zhang, Qingqing Chen, Wei Wang, Haibin Chen
    Abstract:

    A white light non-scanning correlation interrogation system was proposed and built to interrogate absolute length of the Air Cavity of fiber-optic compound Fabry–Perot pressure sensors for the extraction of pressure value. By carefully choosing thickness range and tilt angle of the optical wedge used for Cavity length matching, correlation interferometric signal of the basal Cavity can be naturally filtered out. Based on peak positioning by Fourier transform, bandpass filtering in frequency domain, inverse Fourier transform back to time domain, envelope fitting and zero fringe finding through a gravity center method, Cavity length can be determined with an accuracy of 0.04%. The system was used for the interrogation of a fiber-optic compound Fabry–Perot pressure sensor under different pressures. For a pressure range of 0.1~2.9 Mpa, the linear relationship between the Air Cavity length and the gas pressure imposed was successfully extracted.

  • Absolute Single Cavity Length Interrogation of Fiber-Optic Compound Fabry–Perot Pressure Sensors Through a White Light Non-Scanning Correlation Method
    Sensors, 2019
    Co-Authors: Zilong Guo, Wentao Lv, Xiongxing Zhang, Haibin Chen, Qingqing Chen, Wei Wang, Zhibo Ma
    Abstract:

    A white light non-scanning correlation interrogation system was proposed and built to interrogate absolute length of the Air Cavity of fiber-optic compound Fabry–Perot pressure sensors for the extraction of pressure value. By carefully choosing thickness range and tilt angle of the optical wedge used for Cavity length matching, correlation interferometric signal of the basal Cavity can be naturally filtered out. Based on peak positioning by Fourier transform, bandpass filtering in frequency domain, inverse Fourier transform back to time domain, envelope fitting and zero fringe finding through a gravity center method, Cavity length can be determined with an accuracy of 0.04%. The system was used for the interrogation of a fiber-optic compound Fabry–Perot pressure sensor under different pressures. For a pressure range of 0.1~2.9 Mpa, the linear relationship between the Air Cavity length and the gas pressure imposed was successfully extracted.

Ping Yuan - One of the best experts on this subject based on the ideXlab platform.

  • simultaneous measurement of transverse load and temperature using hybrid structured fiber optic fabry perot interferometer
    Scientific Reports, 2017
    Co-Authors: Yongfeng Wu, Jing Wu, Yundong Zhang, Ping Yuan
    Abstract:

    We experimentally demonstrated a novel fiber-optic hybrid structured Fabry–Perot interferometer with special Air-Cavity for simultaneous measurement of transverse load and temperature. By the linear phase finite impulse response filters, the transverse load sensitivities of the Air-Cavity and the silica-Cavity are 1272.71 pm/N and −53.07 pm/N, respectively, and temperature sensitivities of the Air-Cavity and silica-Cavity are 1.1 pm/°C and 14 pm/°C. Thus, the different sensitivities of silica-Cavity and Air-Cavity to transverse load and temperature indicate that such a structure can be used to simultaneously measure transverse load and temperature.

  • fiber optic hybrid structured fabry perot interferometer based on large lateral offset splicing for simultaneous measurement of strain and temperature
    Journal of Lightwave Technology, 2017
    Co-Authors: Yongfeng Wu, Jing Wu, Yundong Zhang, Ping Yuan
    Abstract:

    We report a novel fiber-optic hybrid-structured Fabry–Perot interferometer (HSFPI) based on large lateral offset splicing for simultaneous measurement of strain and temperature with advantages of high sensitivity, low cost, and easy fabrication. The high-strain sensitivity of 28.95 pm/μϵ and low-temperature sensitivity of 0.54 pm/°C are obtained for Air Cavity, and strain sensitivity of 28.95 pm/μϵ is over five times compared to the current HSFPI (5.18 pm/μϵ). In addition, strain and temperature sensitivities of silica Cavity are, respectively, 1.59 pm/μϵ and 12.71 pm/°C. Thus, due to the different sensitivities of Air Cavity and silica Cavity to strain and temperature, this structure can be used to concurrently measure strain and temperature.

  • Temperature-insensitive fiber optic Fabry-Perot interferometer based on special Air Cavity for transverse load and strain measurements
    Optics Express, 2017
    Co-Authors: Yongfeng Wu, Jing Wu, Yundong Zhang, Ping Yuan
    Abstract:

    We experimentally demonstrate transverse load and strain sensing based on a fiber optic Fabry-Perot interferometer (FPI) with special Air Cavity, which was created by fusion splicing single mode fiber (SMF), hollow core fiber (HCF) and several electrical arc discharges. The Cavity height of this structure is higher than the cladding diameter of SMF so that it can sense transverse load with high sensitivity. The transverse load sensitivity of this Air Cavity FPI sensor is 1.31 nm∕N and about 5 times more sensitive compared to the current fiber tip interferometer (0.2526 nm∕N). Meanwhile, this sensor also can measure strain and the strain sensitivity of 3.29 pm∕μe is achieved. In addition, the low temperature sensitivity (1.08 pm/°C) of the sensor can reduce the temperature-induced measurement error. This novel Air Cavity FPI can be developed and used as high-sensitivity transverse load and strain sensor with temperature-insensitive.

P K A Wai - One of the best experts on this subject based on the ideXlab platform.

  • optical fiber tip fabry perot interferometric pressure sensor based on an in situ μ printed Air Cavity
    Journal of Lightwave Technology, 2018
    Co-Authors: Jushuai Wu, Mian Yao, Ping A Zhang, Feng Xiong, P K A Wai
    Abstract:

    In this paper, we present a miniature fiber-optic Fabry–Perot interferometric pressure sensor based on an in situ printed fiber-top Air Cavity. With an in-house optical 3D μ-printing setup, a suspended SU-8 diaphragm with light scatter is directly printed on the end face of standard optical fiber to form a sealed Fabry–Perot Cavity. The fabricated Fabry–Perot microinterferometer shows a linear response to the change of pressure with a sensitivity of 2.93 nm/MPa in the range of 0 ∼ 700 kPa. The response of the sensor to the change of temperature in the range from 30 °C to 65 °C is measured to be ∼38 pm/°C. Such an ultra-small fiber-optic pressure sensor has remote monitoring capability and is promising for a great number of measurement and testing applications ranging from miniature manometers to bioprobes.