Fiber curvature sensor based on spherical-shape structures and long-period grating

Xiong, Mengling; Gong, Huaping; Wang, Zhiping; Chen, Zhao; Dong, Xinyong

doi:10.1016/j.optlaseng.2016.06.022

Cited by 22 publications

(7 citation statements)

References 14 publications

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“…In the experiment, the step increment of translation stage is 5 μm. The curvature of the SMS fiber sensor can be calculated by adopting the approximation of the sine function to the second-order as [30]:…”

Section: B Sms Fiber Sensor Curvature Experimentsmentioning

confidence: 99%

Wearable Optical Fiber Sensor Based on a Bend Singlemode-Multimode-Singlemode Fiber Structure for Respiration Monitoring

Pang

Liu

et al. 2021

IEEE Sensors J.

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Respiration rate (RR) is an important information related to human physiological health. A wearable optical fiber sensor for respiration monitoring based on a bend singlemode-multimodesinglemode (SMS) fiber structure, which is highly sensitive to bend, is firstly proposed and experimentally demonstrated. The sensor fastened by an elastic belt on the abdomen of a person will acquire the respiration signal when the person breaths, which will introduce front and back movement of the abdomen, and thus bend of SMS fiber structure. Short-time Fourier transform (STFT) method is employed for signal processing to extract characteristic information of both the time and frequency domain of the measured waveform, which provides accurate RR measurement. Six different SMS fiber sensors have been tested by six individuals and the experimental results demonstrated that the RR signals can be effectively monitored among different individuals, where an average Pearson Correlation Coefficient of 0.88 of the respiration signal has been achieved, which agrees very well with that of commercial belt respiration sensor. The proposed technique can provide a new wearable and portable solution for monitoring of respiratory with advantage of easy fabrication and robust to environment.

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Section: B Sms Fiber Sensor Curvature Experimentsmentioning

confidence: 99%

Wearable Optical Fiber Sensor Based on a Bend Singlemode-Multimode-Singlemode Fiber Structure for Respiration Monitoring

Pang

Liu

et al. 2021

IEEE Sensors J.

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“…For the indisputable superiorities, the optical fiber sensor is widely applied in many fields, such as industrial production, medical application, environmental protection, and monitoring quality of construction. A variety of optical fiber sensors have been fabricated to gather information of multifarious physical and chemical parameters, such as temperature [1], pressure [2], curvature [3,4], humidity [5], and refractive index (RI) [6]. In order to fabricate these sensors, various kinds of fibers are adopted, such as photonic crystal fiber (PCF) [7,8], polarization-maintaining fiber [9,10], twin-core fiber [11], sapphire optical fiber [12], micro-fiber [13], and D-shaped fiber [14].…”

Section: Introductionmentioning

confidence: 99%

A Probe-Shaped Sensor With FBG and Fiber-Tip Bubble for Pressure and Temperature Sensing

et al. 2021

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A probe-shaped sensor for simultaneous temperature and pressure measurement was reported in this article. The effective length of the sensor was ∼2mm, consisting of a fiber Bragg grating (FBG) and a Fabry-Perot interferometer (FPI) with a nano silica diaphragm. The response sensitivities of the sensor for pressure and temperature were measured as −0.98 nm/MPa and 11.10 pm/°C, respectively. This sensor had an extremely low cross-sensitivity between pressure and temperature, which provided a significant potential in dual-parameter sensing.

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“…Moreover, mechanical bending is an important physical parameter to be measured in order to determine deformations, displacements, and curvature radius for high resolution optical instrumentation processes. In recent years, several bending sensors based on optical fiber structures have been reported [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Most of them are based on the modal Mach-Zehnder interferometer (MZI), whose construction is by means of optical fiber devices which couples light propagation modes between core and cladding, such as tapered fibers [ 8 ], long-period fiber gratings (LPFG) [ 9 ], fiber Bragg gratings (FBG) [ 10 ], and micro-fiber lenses [ 3 ], among others.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, several bending sensors based on optical fiber structures have been reported [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Most of them are based on the modal Mach-Zehnder interferometer (MZI), whose construction is by means of optical fiber devices which couples light propagation modes between core and cladding, such as tapered fibers [ 8 ], long-period fiber gratings (LPFG) [ 9 ], fiber Bragg gratings (FBG) [ 10 ], and micro-fiber lenses [ 3 ], among others. In the aforementioned in-fiber structures, the use of two mode coupler devices is necessary to construct an MZI, however, the fabrication process for FBGs, LPFGs, and spliced spherical shape structures is not quite as simple.…”

Section: Introductionmentioning

confidence: 99%

Adaptable Optical Fiber Displacement-Curvature Sensor Based on a Modal Michelson Interferometer with a Tapered Single Mode Fiber

Salceda-Delgado

Martı́nez-Rios

Selvas-Aguilar

et al. 2017

Sensors

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A compact, highly sensitive optical fiber displacement and curvature radius sensor is presented. The device consists of an adiabatic bi-conical fused fiber taper spliced to a single-mode fiber (SMF) segment with a flat face end. The bi-conical taper structure acts as a modal coupling device between core and cladding modes for the SMF segment. When the bi-conical taper is bent by an axial displacement, the symmetrical bi-conical shape of the tapered structure is stressed, causing a change in the refractive index profile which becomes asymmetric. As a result, the taper adiabaticity is lost, and interference between modes appears. As the bending increases, a small change in the fringe visibility and a wavelength shift on the periodical reflection spectrum of the in-fiber interferometer is produced. The displacement sensitivity and the spectral periodicity of the device can be adjusted by the proper selection of the SMF length. Sensitivities from around 1.93 to 3.4 nm/mm were obtained for SMF length between 7.5 and 12.5 cm. Both sensor interrogations, wavelength shift and visibility contrast, can be used to measure displacement and curvature radius magnitudes.

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Fiber curvature sensor based on spherical-shape structures and long-period grating

Cited by 22 publications

References 14 publications

Wearable Optical Fiber Sensor Based on a Bend Singlemode-Multimode-Singlemode Fiber Structure for Respiration Monitoring

Wearable Optical Fiber Sensor Based on a Bend Singlemode-Multimode-Singlemode Fiber Structure for Respiration Monitoring

A Probe-Shaped Sensor With FBG and Fiber-Tip Bubble for Pressure and Temperature Sensing

Adaptable Optical Fiber Displacement-Curvature Sensor Based on a Modal Michelson Interferometer with a Tapered Single Mode Fiber

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