Temperature compensation fiber-optic refractive index sensor based on single-mode fiber core-offset attenuator

2012 ◽  
Author(s):  
HuaQi Cheng ◽  
ZhenGuo Jing ◽  
Peng Wei ◽  
ChuanQi Xing
Keyword(s):  
Refractive Index ◽  
Temperature Compensation ◽  
Fiber Optic ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Refractive Index Sensor ◽  
Fiber Core

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.

scholarly journals Single mode tapered fiber-optic interferometer based refractive index sensor and its application to protein sensing

2014 ◽  
Vol 22 (19) ◽  
pp. 22802 ◽  
Author(s):  
T. K Yadav ◽  
R. Narayanaswamy ◽  
M. H. Abu Bakar ◽  
Y. Mustapha Kamil ◽  
M. A. Mahdi
Keyword(s):  
Refractive Index ◽  
Fiber Optic ◽  
Single Mode ◽  
Refractive Index Sensor ◽  
Protein Sensing ◽  
Tapered Fiber ◽  
Fiber Optic Interferometer

scholarly journals Preparation and Characterization of Microsphere ZnO ALD Coating Dedicated for the Fiber-Optic Refractive Index Sensor

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 306 ◽  
Author(s):  
Paulina Listewnik ◽  
Marzena Hirsch ◽  
Przemysław Struk ◽  
Matthieu Weber ◽  
Mikhael Bechelany ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Fiber Optic ◽  
Single Mode ◽  
Atomic Layer ◽  
Fiber Optic Sensor ◽  
Refractive Index Sensor ◽  
Layer Deposition ◽  
Fabry Perot

We report the fabrication of a novel fiber-optic sensor device, based on the use of a microsphere conformally coated with a thin layer of zinc oxide (ZnO) by atomic layer deposition (ALD), and its use as a refractive index sensor. The microsphere was prepared on the tip of a single-mode optical fiber, on which a conformal ZnO thin film of 200 nm was deposited using an ALD process based on diethyl zinc (DEZ) and water at 100 °C. The modified fiber-optic microsphere was examined using scanning electron microscopy and Raman spectroscopy. Theoretical modeling has been carried out to assess the structure performance, and the performed experimental measurements carried out confirmed the enhanced sensing abilities when the microsphere was coated with a ZnO layer. The fabricated refractive index sensor was operating in a reflective mode of a Fabry–Pérot configuration, using a low coherent measurement system. The application of the ALD ZnO coating enabled for a better measurement of the refractive index of samples in the range of the refractive index allowed by the optical fiber. The proof-of-concept results presented in this work open prospects for the sensing community and will promote the use of fiber-optic sensing technologies.

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.

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
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