scholarly journals Graphene Oxide Sensitized No-Core Fiber Step-Index Distribution Sucrose Sensor

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 101
Author(s):  
Gongli Xiao ◽  
Kaifu Zhang ◽  
Yuting Yang ◽  
Hongyan Yang ◽  
Ling Guo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Sucrose Concentration ◽  
Beam Propagation Method ◽  
High Sensitivity ◽  
Single Mode ◽  
Step Index ◽  
Index Distribution ◽  
Low Threshold ◽  
Core Fiber ◽  
Sensor Detection

By coating graphene oxide (GO) onto the surface no-core fiber (NCF), we designed a single-mode no-core single-mode (SNS) fiber Step-Index Distribution sucrose sensor. With wavelength demodulation and the beam propagation method (BPM), the sensor without a GO coating was studied in the low RI range of 1.33~1.389, and the high RI range of 1.389~1.4185. The experiments show that the RI sensitivity of the sensor respectively reaches 132.9 nm/RIU and 292.22 nm/RIU. Both the numerical simulation and the experiments are highly consistent with the theoretical analysis results. Especially, having coated GO on the NCF for sensitization, a high sensitivity was achieved for the response to sucrose concentration solutions. The sensor’s RI sensitivity was increased from 132.9 nm/RIU up to 1348.67 nm/RIU in the ultra-narrow range of 1.33 to 1.3385. This result provides a theoretical and experimental basis for the enrichment and development of sensor detection with a low threshold sucrose concentration.

Temperature-insensitive intensity-modulation liquid refractive index sensor based on fiber-optic Michelson probe structure

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Chen Zheng ◽  
Wenlin Feng ◽  
Xiaozhan Yang ◽  
Guojia Huang ◽  
Lian Wang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Beam Propagation Method ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Intensity Change ◽  
Refractive Index Sensor ◽  
Silver Mirror ◽  
Core Fiber ◽  
Core Modes ◽  
Theoretical Results

Abstract A novel liquid refractive index sensor based on the connected single-mode fiber (SMF), no-core fiber (NCF), four-core fiber (FCF), and silver mirror (SM) to form an SMF–NCF–FCF–SM Michelson probe structure is proposed and fabricated. The change of light field in the probe structure has been simulated by the light-beam propagation method. The theoretical results show that light is excited in the NCF and couples into the cores and cladding of FCF at the junction of NCF and FCF. The interference fringes are generated between the cladding modes and core modes of FCF. The sensitivities of the probe in NaCl, sucrose, and glycerol are 171.75 dB/RIU, 121.41 dB/RIU, and 207.50 dB/RIU, respectively. The temperature sensitivity is 0.05 nm/°C, and the intensity change of temperature (≤0.046 dB/°C) is very small and has little effect on the liquid refractive index. Thus, the cross-sensitivity of temperature for the liquid refractive index can be removed. The proposed probe structure has the advantages of easy fabrication, good stability, and linear response, having potential application in the liquid refractive index monitoring environments.

Graphene oxide-polymethylmethacrylate polymer waveguide device based on near infrared fingerprint spectrum for refractive index sensing

2017 ◽  
Vol 40 (8) ◽  
pp. 2607-2610
Author(s):  
Botao Wang ◽  
Qi Wang ◽  
Lingxin Kong ◽  
Riqing Lv
Keyword(s):  
Refractive Index ◽  
Graphene Oxide ◽  
Near Infrared ◽  
High Sensitivity ◽  
Single Mode ◽  
Glycerol Solution ◽  
Refractive Index Measurement ◽  
Polymer Waveguide ◽  
Refractive Index Sensing ◽  
High Measurement

A graphene oxide-polymethylmethacrylate (GO-PMMA) microfiber sensor is proposed and experimentally demonstrated in this paper, which is based on the absorption principle of near infrared spectra for external refractive index sensing. The sensor was fabricated by splicing a section of 1 mm GO-PMMA between two tapered single mode fibers. The hydrophilic groups of graphene oxide can be used to measure the proportion of water in glycerol solution, and achieve the goal of refractive index measurement indirectly. Experiments were conducted for moisture content of 4.3%~45% (refractive index range from 1.3400 to 1.4054) in glycerin solution. Different concentrations of glycerol solution have different intensities of absorption peaks near 1530 nm wavelength. The absorption peak power near 1530 nm wavelength responses to the external refractive index was experimentally studied. The results show that the sensor possesses a high sensitivity of 167.39 dB/RIU in the refractive index range of 1.34~1.41 and has a good linearity response to external refractive index. The proposed sensor is attractive owing to its high measurement speed, accurate, no pollution and lower cost, and is suited for long-term online real-time measurement.

Optimum design for a novel large mode area fiber with triangle-platform-index core

2019 ◽  
Vol 33 (18) ◽  
pp. 1950207 ◽  
Author(s):  
Xiaofang Miao ◽  
Peng Wu ◽  
Baoyin Zhao
Keyword(s):  
Power Level ◽  
Single Mode ◽  
Output Power Level ◽  
Nonlinear Phenomenon ◽  
Industrial Processing ◽  
Mode Field ◽  
Index Distribution ◽  
Core Fiber ◽  
Mode Area ◽  
Field Area

A triangle-platform-index core fiber is proposed, in which the refractive index distribution in the cross-section of the fiber core is composed of several closely connected triangles and a platform at the outermost layer. The simulation results show that the proposed fiber possesses an extremely large mode field area of [Formula: see text] at the wavelength of [Formula: see text], and achieves single-mode operation state near a bend radius of 17 cm. Furthermore, several different mode field distributions, including Gauss-like distribution, flatten distribution and hollow distribution, are achieved. The proposed fiber can benefit suppressing nonlinear phenomenon to increase the output power level of fiber laser, and promoting special industrial processing.

scholarly journals In-Fiber BaTiO3 Microsphere Resonator for High-Sensitivity Temperature Measurement

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 318
Author(s):  
Chi Li ◽  
Meng Zhu ◽  
Peng Ji ◽  
Cong Xiong ◽  
Changrui Liao
Keyword(s):  
Fiber Optic ◽  
Temperature Response ◽  
High Sensitivity ◽  
Single Mode ◽  
Whispering Gallery Mode ◽  
Transmission Spectra ◽  
Hollow Core ◽  
Polymer Waveguide ◽  
Whispering Gallery ◽  
Core Fiber

A fiber optic whispering gallery mode (WGM) resonator was proposed and realized by integrating an inline polymer waveguide with a microsphere mounted on it. The polymer waveguide with a diameter of 1 μm was printed with femtosecond laser-assisted multiphoton polymerization in a section of a grooved hollow-core fiber, which was sandwiched between two single-mode fibers. Two WGW resonators assembled with microspheres of different sizes were prepared. The transmission spectra of those stimulated WGMs were investigated both in simulation and experimentally. The temperature response of the resonators was particularly studied, and a linear sensitivity of −593 pm/°C was achieved from 20 °C to 100 °C.

Carbon monoxide gas sensor based on α-Fe2O3/rGOQDs composite film integrated Michelson interferometer

2021 ◽  
Author(s):  
Sijie He ◽  
Yushan Liu ◽  
Wenlin Feng ◽  
Bangxin Li ◽  
Xiao-Zhan Yang ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Composite Film ◽  
Silver Film ◽  
Simple Structure ◽  
High Selectivity ◽  
Michelson Interferometer ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Core Fiber

Abstract A carbon monoxide sensor based on Michelson interferometer combined with α-Fe2O3/rGOQDs composite film is proposed and fabricated. First, a waist-enlarged taper is formed between the single-mode fiber (SMF) and the no-core fiber (NCF), then the other end of the NCF is spliced with a section of thin-core fiber (TCF). Besides, the end of the TCF is coated with a layer of silver film to enhance the reflection. Thus, the Michelson interferometer of SMF-NCF-TCF is formed. The α-Fe2O3/rGOQDs composite film is deposited on the outside surface of TCF. The specific adsorption of carbon monoxide by the composite film leads to the change of the sensor’s effective refractive index (RI), realizing the detection of carbon monoxide. The results show that the interference intensity of the monitoring valley decreases with the increase of the concentration of carbon monoxide. The sensitivity of the sensor is 0.057 dBm/ppm, the detection limit of the sensor is 105 ppb, and the response time and recovery time are 70 s and 100 s, respectively. The sensor has the advantages of high sensitivity, high selectivity and simple structure, and it is expected to be applied for the detection of carbon monoxide gas with low concentration.

A High Sensitivity Index Sensor Based on No-Core Fibers

2013 ◽  
Vol 284-287 ◽  
pp. 1986-1990
Author(s):  
Guei Ru Lin ◽  
Ming Yue Fu ◽  
Hao Jan Sheng ◽  
Hai Tao Sun ◽  
Wen Fung Liu
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Single Mode ◽  
Wavelength Shift ◽  
Refractive Index Sensor ◽  
Sensitivity Index ◽  
Reflective Index ◽  
Index Measurement ◽  
Core Fiber ◽  
Multi Mode

A simple, small-size, compact and high-sensitivity refractive-index sensor composed of a short no-core fiber (NCF) about 20 mm in length sandwiched between two pieces of single-mode fibers is proposed in this paper. The index measurement is experimentally demonstrated with the sensitivity of 7792.85 nm/ RIU in the range from 1.440 to 1.454 and 227.14 nm/ RIU in the range from 1.300 to 1.430. This sensing mechanism is based on the induced multi-mode interfering wavelength shift in the no-core fiber when the reflective index of the fiber outside is changed.

scholarly journals A Refractive Index Sensitive Liquid Level Monitoring Sensor Based on Multimode Interference

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 89
Author(s):  
Fan Zhang ◽  
Shuguang Li ◽  
Xin Yan ◽  
Xuenan Zhang ◽  
Fang Wang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Silica Glass ◽  
Pure Water ◽  
Beam Propagation Method ◽  
High Sensitivity ◽  
Single Mode ◽  
Liquid Level ◽  
Multimode Interference ◽  
Glycerin Solution ◽  
Level Monitoring

According to the beam propagation method, a fiber refractive index-sensitive multimode interference (MMI) structure fabricated by splicing a self-made silica glass rod between two single mode fibers (SMF–NCF (no core fiber)–SMF structure) is proposed for liquid level monitoring. Theoretical and experimental investigation was carried out meticulously using a 4.5 cm and a 9.5 cm long silica glass rod. It is proved that the simple and economical sensor with the shorter length has high sensitivity, satisfactory repeatability, and favorable stability. The sensitivity climbs with the increase in refractive index of the measured liquid, which is 204 pm/mm for pure water, 265.8 pm/mm for 10% glycerin solution, and 352.5 pm/mm for 25% glycerin solution. The proposed sensor can be standardized in certain application circumstances to achieve accurate liquid level monitoring.

scholarly journals Sensitivity Enhancement of Curvature Fiber Sensor Based on Polymer-Coated Capillary Hollow-Core Fiber

Sensors ◽  
2020 ◽  
Vol 20 (13) ◽  
pp. 3763 ◽  
Author(s):  
Luis A. Herrera-Piad ◽  
Iván Hernández-Romano ◽  
Daniel A. May-Arrioja ◽  
Vladimir P. Minkovich ◽  
Miguel Torres-Cisneros
Keyword(s):  
Fiber Optic ◽  
High Sensitivity ◽  
Single Mode ◽  
Cost Effective ◽  
Fiber Optic Sensor ◽  
Hollow Core ◽  
Sensing Applications ◽  
Optic Sensor ◽  
Wide Range ◽  
Core Fiber

In this paper, we propose and experimentally demonstrate a simple technique to enhance the curvature sensitivity of a bending fiber optic sensor based on anti-resonant reflecting optical waveguide (ARROW) guidance. The sensing structure is assembled by splicing a segment of capillary hollow-core fiber (CHCF) between two single-mode fibers (SMF), and the device is set on a steel sheet for measuring different curvatures. Without any surface treatment, the ARROW sensor exhibits a curvature sensitivity of 1.6 dB/m−1 in a curvature range from 0 to 2.14 m−1. By carefully coating half of the CHCF length with polydimethylsiloxane (PDMS), the curvature sensitivity of the ARROW sensor is enhanced to −5.62 dB/m−1, as well as an increment in the curvature range (from 0 to 2.68 m−1). Moreover, the covered device exhibits a low-temperature sensitivity (0.038 dB/°C), meaning that temperature fluctuations do not compromise the bending fiber optic sensor operation. The ARROW sensor fabricated with this technique has high sensitivity and a wide range for curvature measurements, with the advantage that the technique is cost-effective and easy to implement. All these features make this technique appealing for real sensing applications, such as structural health monitoring.

scholarly journals A High Sensitivity Temperature Sensing Probe Based on Microfiber Fabry-Perot Interference

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1819 ◽  
Author(s):  
Zhoubing Li ◽  
Yue Zhang ◽  
Chunqiao Ren ◽  
Zhengqi Sui ◽  
Jin Li
Keyword(s):  
Low Cost ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Temperature Sensing ◽  
Compact Structure ◽  
Fabry Perot ◽  
Temperature Monitor ◽  
Core Fiber ◽  
Fitting In

In this paper, a miniature Fabry-Perot temperature probe was designed by using polydimethylsiloxane (PDMS) to encapsulate a microfiber in one cut of hollow core fiber (HCF). The microfiber tip and a common single mode fiber (SMF) end were used as the two reflectors of the Fabry-Perot interferometer. The temperature sensing performance was experimentally demonstrated with a sensitivity of 11.86 nm/°C and an excellent linear fitting in the range of 43–50 °C. This high sensitivity depends on the large thermal-expansion coefficient of PDMS. This temperature sensor can operate no higher than 200 °C limiting by the physicochemical properties of PDMS. The low cost, fast fabrication process, compact structure and outstanding resolution of less than 10−4 °C enable it being as a promising candidate for exploring the temperature monitor or controller with ultra-high sensitivity and precision.

scholarly journals Optical Fiber Sensor for Temperature and Strain Measurement Based on Multimode Interference and Square-Core Fiber

Micromachines ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1239
Author(s):  
Kun Wang ◽  
Xingchen Dong ◽  
Patrick Kienle ◽  
Maximilian Fink ◽  
Wolfgang Kurz ◽  
...  
Keyword(s):  
Temperature Sensor ◽  
Strain Measurement ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Single Mode ◽  
Fiber Sensor ◽  
Multimode Interference ◽  
Strain Sensing ◽  
Maximal Power ◽  
Core Fiber

A variety of specialty fibers such as no-core fiber (NCF) have already been studied to reveal their sensing abilities. In this work, we investigate a specialty fiber, square-core fiber, for temperature and strain sensing. A simple single-mode–multimode–single-mode (SMS) fiber sensor was fabricated, consisting of a 30-cm-long square-core fiber. The experimental results indicate that the maximal wavelength-temperature and wavelength-strain sensitivities are −15.3 pm/∘C and −1.5 pm/με, respectively, while the maximal power-temperature and power-strain sensitivities are 0.0896 dBm/∘C and 0.0756 dBm/με. Analysis of the results suggests that the fiber sensor has the potential to be used as a high-sensitivity temperature sensor with a low strain sensitivity.

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