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Gerald Farrell - One of the best experts on this subject based on the ideXlab platform.

  • Highly sensitive displacement sensor based on composite interference established within a balloon-shaped bent multimode Fiber Structure
    Applied Optics, 2018
    Co-Authors: Ke Tian, Gerald Farrell, Elfed Lewis, Xianfan Wang, Pengfei Wang
    Abstract:

    A novel optical Fiber displacement sensor based on composite interference established within a balloon-shaped bent multimode (BSBM) Fiber Structure is described and experimentally demonstrated. The BSBM Fiber Structure is realized by bending a straight single-mode–multimode–single-mode (SMS) Fiber Structure into a balloon shape using a length of capillary tube to fix the shape of the Structure. Owing to the bend in the multimode waveguide, the original undistorted multimode interference pattern is changed, and an extra Mach–Zehnder interferometer is effectively introduced within the multimode Fiber (MMF) section at a suitable bending radius. This established composite interference greatly improves the displacement sensing performance of the SMS Fiber Structure. A maximum displacement sensitivity of 0.51 dB/μm over the displacement range of 0–100 μm at the operating wavelength of 1564.7 nm is achieved experimentally. Based on its easy fabrication process, low cost, and high measurement sensitivity, the sensor of this investigation could be a realistic candidate in the high-accuracy displacement measurement field.

  • high sensitivity refractometer based on reflective smf small diameter no core Fiber Structure
    Sensors, 2017
    Co-Authors: Guorui Zhou, Yuliya Semenova, Qiang Wu, Gerald Farrell, Nageswara Lalam, Rahul Kumar, Wai Pang Ng, Xiaodong Yuan, Jinhui Yuan, Chongxiu Yu
    Abstract:

    A high sensitivity refractive index sensor based on a single mode-small diameter no core Fiber Structure is proposed. In this Structure, a small diameter no core Fiber (SDNCF) used as a sensor probe, was fusion spliced to the end face of a traditional single mode Fiber (SMF) and the end face of the SDNCF was coated with a thin film of gold to provide reflective light. The influence of SDNCF diameter and length on the refractive index sensitivity of the sensor has been investigated by both simulations and experiments, where results show that the diameter of SDNCF has significant influence. However, SDNCF length has limited influence on the sensitivity. Experimental results show that a sensitivity of 327 nm/RIU (refractive index unit) has been achieved for refractive indices ranging from 1.33 to 1.38, which agrees well with the simulated results with a sensitivity of 349.5 nm/RIU at refractive indices ranging from 1.33 to 1.38.

  • A Curvature Sensor Based on Twisted Single-Mode–Multimode–Single-Mode Hybrid Optical Fiber Structure
    Journal of Lightwave Technology, 2017
    Co-Authors: Ke Tian, Gerald Farrell, Ya-xian Fan, Yifan Xin, Wenlei Yang, Tao Geng, Jing Ren, Elfed Lewis, Pengfei Wang
    Abstract:

    An optical Fiber curvature sensor based on a twisted multimode Fiber (MMF) sandwiched between two single-mode Fibers (SMF) is proposed and investigated theoretically and experimentally. The measured transmission spectrum exhibits good agreement with theoretical predictions. Compared with a traditional single-mode–multimode–single-mode Fiber Structure sensor, the proposed configuration offers a higher average curvature sensitivity of –2.42 nm/m–1 over a curvature measurement range of 0–1.7390 m–1 and –7.09 dB/m–1 at an operating wavelength of 1537 nm. The temperature sensitivity of this sensor has been determined as 0.01 nm/°C over a wavelength range of 1535–1550 nm and circa 0.007 dB/°C at the wavelength of 1537 nm, over a measured temperature range of 21–121 °C.

  • a curvature sensor based on twisted single mode multimode single mode hybrid optical Fiber Structure
    Journal of Lightwave Technology, 2017
    Co-Authors: Ke Tian, Gerald Farrell, Ya-xian Fan, Yifan Xin, Wenlei Yang, Tao Geng, Jing Ren, Elfed Lewis, Pengfei Wang
    Abstract:

    An optical Fiber curvature sensor based on a twisted multimode Fiber (MMF) sandwiched between two single-mode Fibers (SMF) is proposed and investigated theoretically and experimentally. The measured transmission spectrum exhibits good agreement with theoretical predictions. Compared with a traditional single-mode–multimode–single-mode Fiber Structure sensor, the proposed configuration offers a higher average curvature sensitivity of –2.42 nm/m–1 over a curvature measurement range of 0–1.7390 m–1 and –7.09 dB/m–1 at an operating wavelength of 1537 nm. The temperature sensitivity of this sensor has been determined as 0.01 nm/°C over a wavelength range of 1535–1550 nm and circa 0.007 dB/°C at the wavelength of 1537 nm, over a measured temperature range of 21–121 °C.

  • investigation on stress strain sensing characteristics for magnetorheological smart composite material by a sms Fiber Structure
    IEEE Region 10 Conference, 2015
    Co-Authors: Binghui Li, Yuliya Semenova, Gerald Farrell, H P Chan, Qiang Wu
    Abstract:

    A single-mode-multimode-single-mode (SMS) Fiber Structure based stress/strain sensor is applied to monitor internal stress variations in magnetorhelogical elastomers (MREs) matrix. The liquid silicone rubber mixture with embedded Fibers, i.e. SMS Fiber and Fiber-Bragg-Grating (FBG), are enclosed into an aluminum mould for curing within a permanent magnet field at room temperature for 5 days. Then the cured sample is utilized for internal stress/strain measurement by applying different magnetic field intensity, of the results show that SMS Structure has higher stress/strain sensitivity than that of FBG when a variable magnetic flux density was applied the MRE. The present investigation shows capability of using SMS sensor for online feedback and operation of MREs materials and commercial potential in medical and healthcare applications.

Yuliya Semenova - One of the best experts on this subject based on the ideXlab platform.

  • high sensitivity refractometer based on reflective smf small diameter no core Fiber Structure
    Sensors, 2017
    Co-Authors: Guorui Zhou, Yuliya Semenova, Qiang Wu, Gerald Farrell, Nageswara Lalam, Rahul Kumar, Wai Pang Ng, Xiaodong Yuan, Jinhui Yuan, Chongxiu Yu
    Abstract:

    A high sensitivity refractive index sensor based on a single mode-small diameter no core Fiber Structure is proposed. In this Structure, a small diameter no core Fiber (SDNCF) used as a sensor probe, was fusion spliced to the end face of a traditional single mode Fiber (SMF) and the end face of the SDNCF was coated with a thin film of gold to provide reflective light. The influence of SDNCF diameter and length on the refractive index sensitivity of the sensor has been investigated by both simulations and experiments, where results show that the diameter of SDNCF has significant influence. However, SDNCF length has limited influence on the sensitivity. Experimental results show that a sensitivity of 327 nm/RIU (refractive index unit) has been achieved for refractive indices ranging from 1.33 to 1.38, which agrees well with the simulated results with a sensitivity of 349.5 nm/RIU at refractive indices ranging from 1.33 to 1.38.

  • investigation on stress strain sensing characteristics for magnetorheological smart composite material by a sms Fiber Structure
    IEEE Region 10 Conference, 2015
    Co-Authors: Binghui Li, Yuliya Semenova, Gerald Farrell, H P Chan, Qiang Wu
    Abstract:

    A single-mode-multimode-single-mode (SMS) Fiber Structure based stress/strain sensor is applied to monitor internal stress variations in magnetorhelogical elastomers (MREs) matrix. The liquid silicone rubber mixture with embedded Fibers, i.e. SMS Fiber and Fiber-Bragg-Grating (FBG), are enclosed into an aluminum mould for curing within a permanent magnet field at room temperature for 5 days. Then the cured sample is utilized for internal stress/strain measurement by applying different magnetic field intensity, of the results show that SMS Structure has higher stress/strain sensitivity than that of FBG when a variable magnetic flux density was applied the MRE. The present investigation shows capability of using SMS sensor for online feedback and operation of MREs materials and commercial potential in medical and healthcare applications.

  • Fiber refractometer based on a Fiber bragg grating and single mode multimode single mode Fiber Structure
    Optics Letters, 2011
    Co-Authors: Qiang Wu, Binbin Yan, Yuliya Semenova, Chongxiu Yu, Pengfei Wang, Gerald Farrell
    Abstract:

    A refractive index (RI) sensor based on a novel Fiber Structure that consists of a single-mode–multimode–single-mode (SMS) Fiber Structure followed by a Fiber Bragg grating was demonstrated. The multimode Fiber in the SMS Structure excites cladding modes within output single-mode Fiber (SMF) and recouple the reflected cladding Bragg wavelength to the input SMF core. By measuring the relative Bragg wavelength shift between core and cladding Bragg wavelengths, the RI can be determined. Experimentally we have achieved a maximum sensitivity of 7.33 nm/RIU (RI unit) at RI range from 1.324 to 1.439.

  • The use of a bent singlemode-multimode-singlemode (SMS) Fiber Structure for vibration sensing
    21st International Conference on Optical Fiber Sensors, 2011
    Co-Authors: Yuliya Semenova, Pengfei Wang, Gerald Farrell
    Abstract:

    A bent singlemode-multimode-singlemode (SMS) Fiber Structure based vibration sensor is proposed and developed. This sensor configuration is very simple and employs a bent SMS Fiber Structure and a narrow band optical source such as a laser. The vibration applied to the bent SMS Fiber Structure will change the bend radius and hence the intensity of the transmitted optical power will also vary. Experimental results show that the sensor can detect vibration frequencies over a broad range with good sensitivity, from hertz to a few kHz.

  • humidity sensor based on a single mode hetero core Fiber Structure
    Optics Letters, 2011
    Co-Authors: Yuliya Semenova, Pengfei Wang, Jinesh Mathew, Gerald Farrell
    Abstract:

    Using a small-core single-mode Fiber (SCSMF), a novel relative humidity (RH) sensor based on an SMF28-SCSMF-SMF28 Fiber Structure was proposed in this paper. By depositing a humidity sensitive material, such as poly (ethylene oxide) (PEO) on the bare SCSMF Fiber, the proposed Structure can act as an RH sensor with high sensitivity. Experiments demonstrated that the proposed RH sensor with PEO coating can achieve a sensitivity of 430 nm per relative humidity unit (RHU) in the RH range from 80% to 83% RH and a sensitivity of 50 nm per RHU in the RH range from 83% to 95% RH.

Agus Muhamad Hatta - One of the best experts on this subject based on the ideXlab platform.

  • Use of a singlemode multimode singlemode Fiber Structure for apex cardiography monitoring
    Fourth International Seminar on Photonics Optics and Its Applications (ISPhOA 2020), 2021
    Co-Authors: Frans Rizal Agustiyanto, Agus Muhamad Hatta, Dhany Arifianto, Budi Susetio Pikir
    Abstract:

    A cardiac apex impulse sensing based on a singlemode-multimode-singlemode (SMS) Fiber Structure has been demonstrated experimentally to monitor heart pulse in the human body. The sensor was placed onto the sample’s skin at the precordium area. By detecting the power output variation due to vibration applied to the SMS Fiber Structure by cardiac apex impulse, the heart condition could be observed. The pulse wave signal pattern which was obtained had the similar signal pattern with the apex cardiography reference signal graph. The proposed method can be used to measure vital signs with several advantages, such as real-time and accuracy, high sensitivity, reproducible, low cost and convenient operation.

  • Enhancing Temperature Sensitivity for The SMS Fiber Structure Temperature Sensor
    2018 3rd International Seminar on Sensors Instrumentation Measurement and Metrology (ISSIMM), 2018
    Co-Authors: Agus Muhamad Hatta, Rima Fitria Adiati, Rinda Nur Hidayati, Detak Yan Pratama
    Abstract:

    The single mode - multimode - single mode (SMS) Fiber Structures have been utilized for various temperature sensor applications. In this paper, we investigated a way to enhance the temperature sensitivity of SMS Fiber Structure as a sensor. Application of packaging material in the optical Fiber sensor can induce strain due to a temperature variation. Three types of material, namely steel, aluminum, and PTFE were used as the packaging material in a bar shape. The SMS Fiber Structure was glued on the packaging material at two points of the bar. A coefficient of thermal expansion (CTE) of packaging material plays important role in designing the sensor. A modal propagation analysis (MPA) is used to analyze the light propagation in the SMS Fiber Structure, taken into account the CTE of packaging material. It is shown that the use of packaging can enhance the temperature sensor sensitivity of SMS Fiber Structure.

  • Relative humidity sensor based on SMS Fiber Structure using multimode coreless Fiber
    Second International Seminar on Photonics Optics and Its Applications (ISPhOA 2016), 2016
    Co-Authors: Sanif Syafrani, Agus Muhamad Hatta, Apriani Kusumawardhani
    Abstract:

    Singlemode-Multimode-Singlemode (SMS) optical Fiber Structure using multimode coreless have been able to sense changes in relative humidity. In this experiment the measured humidity is 60 % -90 %, while the method is done by comparing the relative humidity changes with the change in output power in the optical Fiber. Then the underlying phenomena is the change in the refractive index of air as the cladding MMF coreless due to changes in relative humidity. It has been done three length variations MMF coreless to add sensitivity sensor, and the obtained sensor by 22.30 mm MMF length have the greatest sensitivity, that is 0.0747 dBm / %. Obtained conclusions on length variation will cause any change in the sensitivity significantly in relative humidity between 75 % -80 %.

  • Alcohol sensor based on single-mode-multimode-single-mode Fiber Structure
    Second International Seminar on Photonics Optics and Its Applications (ISPhOA 2016), 2016
    Co-Authors: R Mefina Yulias, Agus Muhamad Hatta, Sekartedjo Sekartedjo
    Abstract:

    Alcohol sensor based on Single-mode -Multimode-Single-mode (SMS) Fiber Structure is being proposed to sense alcohol concentration in alcohol-water mixtures. This proposed sensor uses refractive index sensing as its sensing principle. Fabricated SMS Fiber Structure had 40 m of multimode length. With power input -6 dBm and wavelength 1550 nm, the proposed sensor showed good response with sensitivity 1,983 dB per % v/v with measurement range 05 % v/v and measurement span 0,5% v/v.

  • Investigation of load effect on macro-bend losses for an SMS Fiber Structure with a small bend radius
    Second International Seminar on Photonics Optics and Its Applications (ISPhOA 2016), 2016
    Co-Authors: Fitri Rahmah, Sekartedjo Sekartedjo, Agus Muhamad Hatta
    Abstract:

    Modelling of load effect on macro-bend losses for a singlemode-multimode-singlemode (SMS) Fiber Structure with small bend radius is presented. Load effect on macro-bend losses for the SMS Fiber Structure placed between two high-density polyethylene (HDPE) boards are investigated theoretically and experimentally. A model on macro-bend losses for SMS Fiber Structure is constructed by using the light transmission formula in a straight SMS Fiber Structure and taking into account the effective number of guided modes due to the macrobending. In the experimental, a mandrel with a diameter of 0.8 mm is used to induce the bend. When the loads are applied on the system, the mandrel will affect the bend losses for the SMS Fiber Structure. It is shown numerically and experimentally that the bend-loss of SMS Fiber Structure strongly depends on the applied loads and the multimode Fiber (MMF) lengths.

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

  • Highly sensitive displacement sensor based on composite interference established within a balloon-shaped bent multimode Fiber Structure
    Applied Optics, 2018
    Co-Authors: Ke Tian, Gerald Farrell, Elfed Lewis, Xianfan Wang, Pengfei Wang
    Abstract:

    A novel optical Fiber displacement sensor based on composite interference established within a balloon-shaped bent multimode (BSBM) Fiber Structure is described and experimentally demonstrated. The BSBM Fiber Structure is realized by bending a straight single-mode–multimode–single-mode (SMS) Fiber Structure into a balloon shape using a length of capillary tube to fix the shape of the Structure. Owing to the bend in the multimode waveguide, the original undistorted multimode interference pattern is changed, and an extra Mach–Zehnder interferometer is effectively introduced within the multimode Fiber (MMF) section at a suitable bending radius. This established composite interference greatly improves the displacement sensing performance of the SMS Fiber Structure. A maximum displacement sensitivity of 0.51 dB/μm over the displacement range of 0–100 μm at the operating wavelength of 1564.7 nm is achieved experimentally. Based on its easy fabrication process, low cost, and high measurement sensitivity, the sensor of this investigation could be a realistic candidate in the high-accuracy displacement measurement field.

  • A Curvature Sensor Based on Twisted Single-Mode–Multimode–Single-Mode Hybrid Optical Fiber Structure
    Journal of Lightwave Technology, 2017
    Co-Authors: Ke Tian, Gerald Farrell, Ya-xian Fan, Yifan Xin, Wenlei Yang, Tao Geng, Jing Ren, Elfed Lewis, Pengfei Wang
    Abstract:

    An optical Fiber curvature sensor based on a twisted multimode Fiber (MMF) sandwiched between two single-mode Fibers (SMF) is proposed and investigated theoretically and experimentally. The measured transmission spectrum exhibits good agreement with theoretical predictions. Compared with a traditional single-mode–multimode–single-mode Fiber Structure sensor, the proposed configuration offers a higher average curvature sensitivity of –2.42 nm/m–1 over a curvature measurement range of 0–1.7390 m–1 and –7.09 dB/m–1 at an operating wavelength of 1537 nm. The temperature sensitivity of this sensor has been determined as 0.01 nm/°C over a wavelength range of 1535–1550 nm and circa 0.007 dB/°C at the wavelength of 1537 nm, over a measured temperature range of 21–121 °C.

  • a curvature sensor based on twisted single mode multimode single mode hybrid optical Fiber Structure
    Journal of Lightwave Technology, 2017
    Co-Authors: Ke Tian, Gerald Farrell, Ya-xian Fan, Yifan Xin, Wenlei Yang, Tao Geng, Jing Ren, Elfed Lewis, Pengfei Wang
    Abstract:

    An optical Fiber curvature sensor based on a twisted multimode Fiber (MMF) sandwiched between two single-mode Fibers (SMF) is proposed and investigated theoretically and experimentally. The measured transmission spectrum exhibits good agreement with theoretical predictions. Compared with a traditional single-mode–multimode–single-mode Fiber Structure sensor, the proposed configuration offers a higher average curvature sensitivity of –2.42 nm/m–1 over a curvature measurement range of 0–1.7390 m–1 and –7.09 dB/m–1 at an operating wavelength of 1537 nm. The temperature sensitivity of this sensor has been determined as 0.01 nm/°C over a wavelength range of 1535–1550 nm and circa 0.007 dB/°C at the wavelength of 1537 nm, over a measured temperature range of 21–121 °C.

  • Fiber refractometer based on a Fiber bragg grating and single mode multimode single mode Fiber Structure
    Optics Letters, 2011
    Co-Authors: Qiang Wu, Binbin Yan, Yuliya Semenova, Chongxiu Yu, Pengfei Wang, Gerald Farrell
    Abstract:

    A refractive index (RI) sensor based on a novel Fiber Structure that consists of a single-mode–multimode–single-mode (SMS) Fiber Structure followed by a Fiber Bragg grating was demonstrated. The multimode Fiber in the SMS Structure excites cladding modes within output single-mode Fiber (SMF) and recouple the reflected cladding Bragg wavelength to the input SMF core. By measuring the relative Bragg wavelength shift between core and cladding Bragg wavelengths, the RI can be determined. Experimentally we have achieved a maximum sensitivity of 7.33 nm/RIU (RI unit) at RI range from 1.324 to 1.439.

  • The use of a bent singlemode-multimode-singlemode (SMS) Fiber Structure for vibration sensing
    21st International Conference on Optical Fiber Sensors, 2011
    Co-Authors: Yuliya Semenova, Pengfei Wang, Gerald Farrell
    Abstract:

    A bent singlemode-multimode-singlemode (SMS) Fiber Structure based vibration sensor is proposed and developed. This sensor configuration is very simple and employs a bent SMS Fiber Structure and a narrow band optical source such as a laser. The vibration applied to the bent SMS Fiber Structure will change the bend radius and hence the intensity of the transmitted optical power will also vary. Experimental results show that the sensor can detect vibration frequencies over a broad range with good sensitivity, from hertz to a few kHz.

Hai Xiao - One of the best experts on this subject based on the ideXlab platform.

  • temperature compensated refractometer based on a cascaded sms lpfg Fiber Structure
    Sensors and Actuators B-chemical, 2014
    Co-Authors: Jie Huang, Amardeep Kau, Hanzheng Wang, Lei Yua, Hai Xiao
    Abstract:

    Abstract A hybrid optical Fiber Structure for refractive index (RI) measurement with the temperature compensation capability is reported. The Structure consists of a CO2 laser-induced long period Fiber grating (LPFG) and a section of single mode–multimode–single mode (SMS) Fiber Structure. The LPFG serves as a refractometer with a temperature compensator using a simple SMS Fiber Structure. The sensing mechanism of this device has been investigated and experimentally demonstrated. The SMS Structure was insensitive towards the change in the ambient RI but was sensitive towards the changes in the ambient temperature whereas the LPFG was sensitive towards both. A sensitivity matrix was built to compensate the temperature-RI crosstalk. The capability of simultaneous measurement of temperature and RI of the sensor was experimentally validated.

  • Temperature Compensated Refractometer Based on a Cascaded SMS/LPFG Fiber Structure
    Sensors and Actuators B: Chemical, 2014
    Co-Authors: Jie Huang, Hanzheng Wang, Xinwei Lan, Amardeep Kaur, Lei Yuan, Hai Xiao
    Abstract:

    Abstract A hybrid optical Fiber Structure for refractive index (RI) measurement with the temperature compensation capability is reported. The Structure consists of a CO2 laser-induced long period Fiber grating (LPFG) and a section of single mode–multimode–single mode (SMS) Fiber Structure. The LPFG serves as a refractometer with a temperature compensator using a simple SMS Fiber Structure. The sensing mechanism of this device has been investigated and experimentally demonstrated. The SMS Structure was insensitive towards the change in the ambient RI but was sensitive towards the changes in the ambient temperature whereas the LPFG was sensitive towards both. A sensitivity matrix was built to compensate the temperature-RI crosstalk. The capability of simultaneous measurement of temperature and RI of the sensor was experimentally validated.