Thermally insensitive pressure measurements up to 300 degree C using fiber Bragg gratings written onto side hole single mode fiber

2000 ◽  
Author(s):  
Tsutomu Yamate
Keyword(s):  
Fiber Bragg Gratings ◽  
Single Mode ◽  
Bragg Gratings ◽  
Single Mode Fiber ◽  
Pressure Measurements ◽  
Side Hole

scholarly journals Performance of etched silica FBG for simultaneous strain temperature measurement

2021 ◽  
Author(s):  
Koustav Dey ◽  
Ramesh Buddu ◽  
Sourabh Roy
Keyword(s):  
Temperature Measurement ◽  
Experimental Measurement ◽  
Bandpass Filter ◽  
Fiber Bragg Gratings ◽  
Strain Range ◽  
Single Mode ◽  
Bragg Gratings ◽  
Single Mode Fiber ◽  
Experimental Results ◽  
Interrogation Technique

Abstract In this article, we have extensively investigated the efficiency of etched silica-based fiber Bragg gratings (FBGs) for the experimental measurement of temperature and strain simultaneously. A single-multi-single mode fiber (SMS) combination is employed in the circuitry which acts as a bandpass filter for efficient interrogation technique. We recorded the sensitivity of 20.30 pm/°C and 2.89 pm/µɛ over the temperature and strain range of 25–225°C and 50-2050 µɛ, respectively. These data were recorded with the strain resolution of ± 10 µɛ whereas the resolution for the temperature is ± 0.50°C. The experimental results show the potentiality of the sensor for measuring the strain and temperature simultaneously with higher intrinsic sensitivity and resolution.

scholarly journals Sapphire-Derived Fiber Bragg Gratings for High Temperature Sensing

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 946
Author(s):  
Qi Guo ◽  
Zhixu Jia ◽  
Xuepeng Pan ◽  
Shanren Liu ◽  
Zhennan Tian ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Temperature ◽  
Spectral Characteristics ◽  
Fiber Bragg Gratings ◽  
Single Mode ◽  
Bragg Gratings ◽  
Temperature Sensing ◽  
Direct Writing ◽  
Core Diameter ◽  
Application Range

In this paper, a sapphire-derived fiber (SDF) with a core diameter of 10 μm and a cladding diameter of 125 μm is fabricated by the melt-in-tube method, and fiber Bragg gratings (FBGs) with reflectivity over 80% are prepared by the femtosecond laser point-by-point direct writing method. By analyzing the refractive index distribution and reflection spectral characteristics of the SDF, it can be seen that the SDF is a graded refractive index few-mode fiber. In order to study the element composition of the SDF core, the end-face element distribution of the SDF is analyzed, which indicates that element diffusion occurred between the core and the cladding materials. The temperature and stress of the SDF gratings are measured and the highest temperature is tested to 1000 °C. The temperature and strain sensitivities are 15.64 pm/°C and 1.33 pm/με, respectively, which are higher than the temperature sensitivity of the quartz single-mode fiber. As a kind of special fiber, the SDF expands the application range of sapphire fiber, and has important applications in the fields of high-temperature sensing and high-power lasers.

scholarly journals Filament-arrayed Bragg Gratings for azimuthally resolved displacement sensing in single-mode fiber

2022 ◽  
Author(s):  
Abdullah Rahnama ◽  
Hossein Mahlooji ◽  
GLIGOR DJOGO ◽  
Fae Azhari ◽  
Peter Herman
Keyword(s):  
Single Mode ◽  
Bragg Gratings ◽  
Single Mode Fiber
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