scholarly journals High sensitivity refractive index sensor based on a tapered small core single-mode fiber structure

2015 ◽  
Vol 40 (17) ◽  
pp. 4166 ◽  
Author(s):  
Dejun Liu ◽  
Arun Kumar Mallik ◽  
Jinhui Yuan ◽  
Chongxiu Yu ◽  
Gerald Farrell ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Refractive Index Sensor ◽  
Fiber Structure ◽  
Small Core

Refractive index sensor based on ultrafine tapered single-mode nocladding single-mode fiber structure

2019 ◽  
Vol 48 ◽  
pp. 297-302 ◽  
Author(s):  
Mizhen Zhang ◽  
Guixian Zhu ◽  
Lidan Lu ◽  
Xiaoping Lou ◽  
Lianqing Zhu
Keyword(s):  
Refractive Index ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Refractive Index Sensor ◽  
Fiber Structure

scholarly journals Intensity Demodulated Refractive Index Sensor Based on Front-Tapered Single-Mode-Multimode-Single-Mode Fiber Structure

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2396 ◽  
Author(s):  
Jing Kang ◽  
Jiuru Yang ◽  
Xudong Zhang ◽  
Chunyu Liu ◽  
Lu Wang
Keyword(s):  
Refractive Index ◽  
High Stability ◽  
Beam Propagation Method ◽  
Single Mode ◽  
Relative Sensitivity ◽  
Single Mode Fiber ◽  
Continuous Operation ◽  
Refractive Index Sensor ◽  
Fiber Structure ◽  
Drawing Technique

A novel intensity demodulated refractive index (RI) sensor is theoretically and experimentally demonstrated based on the front-tapered single-mode-multimode-single-mode (FT-SMS) fiber structure. The front taper is fabricated in a section of multimode fiber by flame-heated drawing technique. The intensity feature in the taper area is analyzed through the beam propagation method and the comprehensive tests are then conducted in terms of RI and temperature. The experimental results show that, in FT-SMS, the relative sensitivity is −342.815 dB/RIU in the range of 1.33~1.37. The corresponding resolution reaches 2.92 × 10−5 RIU, which is more than four times higher than that in wavelength demodulation. The temperature sensitivity is 0.307 dB/°C and the measurement error from cross-sensitivity is less than 2 × 10−4. In addition, fabricated RI sensor presents high stability in terms of wavelength (±0.045 nm) and intensity (±0.386 dB) within 2 h of continuous operation.

High-Sensitivity Refractive Index Sensor Based on Simply Fabricated Single Mode Fiber Tapers

2012 ◽  
Vol 542-543 ◽  
pp. 901-904
Author(s):  
Ying Wu Zhou
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Single Mode ◽  
Resonance Wavelength ◽  
Single Mode Fiber ◽  
Wavelength Shift ◽  
Refractive Index Sensor ◽  
Response Sensitivity ◽  
Surrounding Refractive Index ◽  
The Relationship

A high sensitivity fiber-optic refractive index sensor based on the bi-conical single mode fiber tapers is proposed and demonstrated. The relationship between the resonance wavelength shift and surrounding refractive index is investigated. The experimental results show that the resonance wavelength linearly shifts toward longer wavelengths with the environmental refractive index ranging from 1.333 to 1.380. The response sensitivity increases with the decrease of the waist diameter of the tapered fiber. The proposed sensor is easily fabricated, compact and may be useful for the chemical and biotechnological industry.

scholarly journals In-line Mach-Zehnder Interferometer based on Hybrid Structures for Refractive Index Sensin

2019 ◽  
Vol 8 (3S) ◽  
pp. 36-40
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Single Mode ◽  
Cost Effective ◽  
Single Mode Fiber ◽  
Zehnder Interferometer ◽  
Refractive Index Sensor ◽  
Compact Size ◽  
Index Changes ◽  
Mach Zehnder Interferometer

A Mach-Zehnder interferometer (MZI) built using several concatenated different structures is proposed as a refractive index sensor. This sensor is comprised of a microbubble, a section of reduced cladding fiber (RCF) and a core-offset single-mode fiber (SMF). These structures are joined together through specialized arc fusion splicing procedures. The sensor is characterised by immersing it in Cargille oil with refractive index values ranging from 1.30 to 1.39. The sensor exhibits linearity in respect to the refractive index changes, with a good sensitivity of 144.42 nm/RIU. The proposed MZI has the advantages of cost effective, repeatable fabrication, compact size and high sensitivity, which make it a promising sensor.

scholarly journals High Sensitivity Refractometer Based on a Tapered-Single Mode-No Core-Single Mode Fiber Structure

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1722 ◽  
Author(s):  
Yang ◽  
Zhang ◽  
Geng ◽  
Li ◽  
Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
Contrast Ratio ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Experimental Investigations ◽  
Multimode Interference ◽  
Fiber Structure ◽  
Index Unit ◽  
Good Agreement

We have proposed a novel tapered-single mode-no core-single mode (TSNS) fiber refractometer based on multimode interference. The TSNS structure exhibits a high contrast ratio (＞15 dB) and a uniform interference fringe. The influence of different lengths and diameters of the TSNS on the refractive index unit (RIU) sensitivity was investigated. The experimental investigations indicated a maximum sensitivity of 1517.28 nm/RIU for a refractive index of 1.417 and low-temperature sensitivity (＜10 pm/ºC). The experimental and simulation results are also in good agreement.

scholarly journals High-Sensitivity Refractive Index Sensor Based on a Cascaded Core-Offset and Macrobending Single-Mode Fiber Interferometer

2021 ◽  
Vol 7 ◽  
Author(s):  
Chuanxin Teng ◽  
Yongjie Zhu ◽  
Fangda Yu ◽  
Shijie Deng ◽  
Libo Yuan ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Single Mode ◽  
Spectral Shift ◽  
Single Mode Fiber ◽  
Refractive Index Sensor ◽  
Core Mode ◽  
Fiber Core ◽  
The Core ◽  
Modal Interference

A high-sensitivity Mach–Zehnder interferometer (MZI) based on the cascaded core-offset and macrobending fiber structure is proposed for refractive index (RI) measurement. The core-offset structure makes the fiber core mode couple to the cladding modes, and some of them recouple back to the fiber core at the macrobending structure forming a model interference effect. The liquid RI can be measured by monitoring the spectral shift of the modal interference. The RI sensing performances for the interferometers with different macrobending radii and core offsets are investigated experimentally. Experimental results show that when the core offset is 2 μm and the macrobending radius is 5.5 mm, the sensitivity can reach 699.95 nm/RIU for the RI of 1.43. The temperature dependence for the proposed sensor is also tested, and a temperature sensitivity of 0.112 nm/°C is obtained.

Strain, torsion and refractive index sensors based on helical long period fibre grating inscribed in small-core fibre for structural condition monitoring

2021 ◽  
Vol 24 (6) ◽  
pp. 1248-1255
Author(s):  
Cailing Fu ◽  
Yi-Qing Ni ◽  
Tong Sun ◽  
Yiping Wang ◽  
Siqi Ding ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Single Mode ◽  
Structural Condition ◽  
Core Diameter ◽  
Small Core ◽  
Long Period ◽  
Sensing Applications ◽  
Core Fibre ◽  
Refractive Index Sensors

This study is intended to develop long period fibre grating sensors for potential applications in environmental and durability monitoring of coastal structures. High-quality helical long period fibre gratings (HLPFGs) are inscribed in different types of small-core single mode fibre (SMF) by use of hydrogen-oxygen flame heating technique. A detailed investigation of the effect of core diameter on their transmission spectrum and optimum length of the HLPFG has been pursued. A longer length is required to achieve the same coupling attenuation in a smaller-core SMF than that of a larger-core fibre. The strain, torsion and refractive index (RI) properties of the HLPFG is investigated experimentally to develop a high-sensitivity sensor. The experimental results show that the strain sensitivity could be enhanced by means of employing a larger-core diameter SMF. Moreover, the HLFPGs are also sensitive to the torsion and external RI. Hence, such HLFPGs have great potential for sensing applications.

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