scholarly journals Hybrid LPG-FBG Based High-Resolution Micro Bending Strain Sensor

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 22
Author(s):  
Song-Bi Lee ◽  
Young-Jun Jung ◽  
Hun-Kook Choi ◽  
Ik-Bu Sohn ◽  
Joo-Hyeon Lee
Keyword(s):  
High Resolution ◽  
Femtosecond Laser ◽  
Practical Method ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Practical Implementation ◽  
Long Period Grating ◽  
Optical Wave ◽  
Long Period ◽  
Signal Pattern

Sensitivity and reliability are essential factors for the practical implementation of a wearable sensor. This study explores the possibility of using a hybrid high-resolution Bragg grating sensor for achieving a fast response to dynamic, continuous motion and Bragg signal pattern monitoring measurement. The wavelength shift pattern for real-time monitoring in picometer units was derived by using femtosecond laser Bragg grating processing on an optical wave path with long-period grating. The possibility of measuring the demodulation system’s Bragg signal pattern on the reflection spectrum of the femtosecond laser precision Bragg process and the long-period grating was confirmed. By demonstrating a practical method of wearing the sensor, the application of wearables was also explored. It is possible to present the applicability of sophisticated micro transformation measurement applications in picometer units.

scholarly journals Femtosecond-Laser-Assisted Fabrication of Radiation-Resistant Fiber Bragg Grating Sensors

2022 ◽  
Vol 12 (2) ◽  
pp. 886
Author(s):  
Hun-Kook Choi ◽  
Young-Jun Jung ◽  
Bong-Ahn Yu ◽  
Jae-Hee Sung ◽  
Ik-Bu Sohn ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fiber Bragg Grating ◽  
Optical Fibers ◽  
Coming Out ◽  
Single Mode ◽  
Femtosecond Laser Irradiation ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Radiation Resistant ◽  
Fbg Sensors

This paper demonstrates the fabrication of radiation-resistant fiber Bragg grating (FBG) sensors using infrared femtosecond laser irradiation. FBG sensors were written inside acrylate-coated fluorine-doped single-mode specialty optical fibers. We detected the Bragg resonance at 1542 nm. By controlling the irradiation conditions, we improved the signal strength coming out from the FBG sensors. A significant reduction in the Bragg wavelength shift was detected in the fabricated FBG sensors for a radiation dose up to 105 gray, indicating excellent radiation resistance capabilities. We also characterized the temperature sensitivity of the radiation-resistant FBG sensors and detected outstanding performance.

All-fibre optical sensing system: Bragg grating sensor interrogated by a long-period grating

1998 ◽  
Vol 9 (12) ◽  
pp. 1969-1973 ◽  
Author(s):  
R W Fallon ◽  
L Zhang ◽  
L A Everall ◽  
J A R Williams ◽  
I Bennion
Keyword(s):  
Optical Sensing ◽  
Bragg Grating ◽  
Long Period Grating ◽  
Long Period ◽  
Sensing System ◽  
Bragg Grating Sensor

Femtosecond laser-written long period grating in a multimode CYTOP polymer fibre

2020 ◽  
Author(s):  
Antreas Theodosiou ◽  
Rui Min ◽  
Arnaldo Leal ◽  
Andreas Ioannou ◽  
Anselmo Frizera-Neto ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Polymer Fibre ◽  
Long Period Grating ◽  
Long Period

Strain/Temperature Discrimination Using Combined Fiber Bragg Grating and Long Period Grating Sensors

1996 ◽  
Author(s):  
H. Patrick ◽  
G. M. Williams ◽  
A. D. Kersey ◽  
J. R. Pedrazzani ◽  
A. M. Vengsarkar
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Long Period Grating ◽  
Long Period

scholarly journals Twist Sensor Based on Long Period Grating and Tilted Bragg Grating Written in Few-mode Fibers

2018 ◽  
pp. 1-1 ◽  
Author(s):  
Kang Yang ◽  
Yange Liu ◽  
Zhi Wang ◽  
Yan Li ◽  
Ya Han ◽  
...  
Keyword(s):  
Bragg Grating ◽  
Long Period Grating ◽  
Long Period

Sensing Characteristics of Long-Period Grating Inscribed in Grapefruit Photonic Crystal Fiber by Femtosecond Laser

2014 ◽  
Vol 513-517 ◽  
pp. 4231-4234
Author(s):  
Yuan Wei ◽  
Yu Jie Du
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Femtosecond Laser ◽  
Photonic Crystal Fiber ◽  
Resonant Wavelength ◽  
Long Period Grating ◽  
Crystal Fiber ◽  
Long Period ◽  
Surrounding Refractive Index ◽  
Novel Method

A novel method for fabricating long period grating in grapefruit photonic crystal fiber (GPCF) is proposed and demonstrated. An 800nm femtosecond laser is adopted to scan a section of GPCF periodically point-by-point, resulting in effective refractive index periodic demodulation. High resonance of ~17dB is obtained with a grating length of 30 mm. The temperature sensitivity of resonant wavelength 0.03 nm/°C is obtained from 20°C to 120 °C. In addition, the relationship between resonant wavelength and surrounding refractive index (SRI), when LPFG immersed in refractive index of solution of different index, is also researched.

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