A Demodulation Scheme for High-Sensitivity Temperature Sensing Based on Long Period Fiber Grating

2011 ◽  
Vol 216 ◽  
pp. 523-527
Author(s):  
Hong Xia Zhao ◽  
Li Wei ◽  
Zhi Qun Ding
Keyword(s):  
Low Cost ◽  
High Sensitivity ◽  
Pulse Interval ◽  
Fiber Grating ◽  
Practical Applications ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Wide Range ◽  
Signal Demodulation ◽  
Period Fiber Grating

Long Period Fiber Grating (LPFG) sensors have wide range of potential applications; low-cost and high-sensitivity demodulation technology is the key of its practical applications. In this paper, an interferometer is comprised of an all-fiber loop mirror and two identical LPFGs, a tunable F-P filter is used to perform wavelength scanning one of the interference peaks, two negative pulse interval formed by signal light in the drive signal period are measured by means of detector and oscilloscope to realize signal demodulation. This demodulation system was used to detect the temperature parameter. The results showed that the sensing sensitivity of this system was demonstrated to be 0.08349 ms/°C, experimentally, which was 2.3 times higher than a single LPFG using the same demodulation technology.

High-sensitivity bending vector sensor based on γ-shaped long-period fiber grating

2021 ◽  
Vol 142 ◽  
pp. 107255
Author(s):  
Mingwei Lai ◽  
Yanxin Zhang ◽  
Zhe Li ◽  
Weigang Zhang ◽  
Han Gao ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Vector Sensor ◽  
Period Fiber Grating

High-sensitivity long-period fiber grating sensor with SAN/cryptophane A for coal mine gas detection

2013 ◽  
Vol 11 (8) ◽  
pp. 080601-80604 ◽  
Author(s):  
Jianchun Yang Jianchun Yang ◽  
Jing Huang Jing Huang ◽  
Xueming Li Xueming Li ◽  
Shanya Li Shanya Li ◽  
Binbin Luo Binbin Luo ◽  
...  
Keyword(s):  
Coal Mine ◽  
High Sensitivity ◽  
Gas Detection ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Coal Mine Gas ◽  
Fiber Grating Sensor ◽  
Mine Gas ◽  
Period Fiber Grating

Low-cost optical fiber temperature-sensing system employing optical transceivers for Ethernet and long-period fiber grating

2019 ◽  
Vol 58 (9) ◽  
pp. 2366 ◽  
Author(s):  
Osanori Koyama ◽  
Makoto Matsui ◽  
Takuro Kagawa ◽  
Yuta Suzuki ◽  
Kanami Ikeda ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Low Cost ◽  
Temperature Sensing ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Sensing System ◽  
Period Fiber Grating ◽  
Optical Transceivers

scholarly journals Humidity Sensor Based on a Long-Period Fiber Grating Coated with Polymer Composite Film

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2263 ◽  
Author(s):  
Yunlong Wang ◽  
Yunqi Liu ◽  
Fang Zou ◽  
Chen Jiang ◽  
Chengbo Mou ◽  
...  
Keyword(s):  
Composite Films ◽  
Resonance Wavelength ◽  
Fiber Grating ◽  
Surface Absorption ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Compact Size ◽  
Wide Range ◽  
Strong Surface ◽  
Period Fiber Grating

We demonstrate a simple and highly sensitive optical fiber relative humidity (RH) sensor based on a long-period fiber grating (LPFG) coated with polyethylene glycol (PEG)/polyvinyl alcohol (PVA) composite films. The resonance wavelength of the LPFG is sensitive to environmental humidity due to the change in effective refractive index caused by the strong surface absorption and desorption of the porous PEG/PVA coatings. The sensor is sensitive in a wide range from 50% to 95% RH, with a highest sensitivity of 2.485 nm/%RH in the range 50–75% RH. The proposed RH sensor has the advantages of compact size, good reversibility, and stability, which makes it attractive for high-humidity environments.

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