scholarly journals Dual-parameter sensing characteristics of a single fiber Bragg grating half-pasted by 1C-LV epoxy under different curing

2021 ◽  
Vol 51 (3) ◽  
Author(s):  
Hong Li ◽  
Haoyue Zhang ◽  
Yanming Song ◽  
Fanyong Meng ◽  
Lianqing Zhu
Keyword(s):  
Fiber Bragg Grating ◽  
Experimental System ◽  
Single Fiber ◽  
Bragg Grating ◽  
Curing Conditions ◽  
Fbg Sensor ◽  
Novel Technology ◽  
Sensor Structure ◽  
Narrow Space ◽  
Sensing Characteristics

A novel technology for the simultaneous and independent measurement of dual parameters is proposed and experimented. By using a single fiber Bragg grating half-pasted by 1C-LV epoxy under different curing conditions, the sensor structure is designed such that the reflective single-peak spectrum splits into a twin-peak spectrum, which makes the FBG spectrum form a natural spectral peak splitting bias. A measurement limitation exists in the FBG sensor packaging at room temperature, which can be solved by the high-temperature cured packaging method. To verify the validity of the theory and methodology, the experimental system is used. In the range from –1000 to +1000 με and from 35 to 75°C, the Bragg wavelength change is relative linear to the strain and temperature. The temperature and strain variations can be independently and simultaneously measured using the split peak, and the deviations of the FBG sensor are ±1°C and ±5 με, respectively. This single FBG sensor can realize dual-parameter measurement, which is valuable for narrow-space health monitoring.

scholarly journals Design Optimization of Sensitivity-Enhanced Structure for Fiber Bragg Grating Acoustic Emission Sensor Based on Additive Manufacturing

Sensors ◽  
2022 ◽  
Vol 22 (2) ◽  
pp. 416
Author(s):  
Yang Yu ◽  
Bo Liu ◽  
Feng Xia
Keyword(s):  
Acoustic Emission ◽  
Additive Manufacturing ◽  
Fiber Bragg Grating ◽  
Experimental System ◽  
Sensitivity Coefficient ◽  
Bragg Grating ◽  
Response Analysis ◽  
Acoustic Emission Sensor ◽  
Element Analysis ◽  
Sensor Structure

A four-loop shaped structure of fiber Bragg grating (FBG) acoustic emission (AE) sensor based on additive manufacturing (AM) technology is proposed in the letter. The finite element analysis (FEA) method was used to model and analyze the sensor structure. We aimed at improving the sensitivity, the static load analysis, and the dynamic response analysis of the normal FBG acoustic emission sensor and the FBG AE sensor with improved structure parameters. We constructed the FBG AE sensor experimental system based on a narrowband laser demodulation method and test on real acoustic emission signals. The results demonstrated that the response sensitivity of the FBG acoustic emission sensor was 1.47 times higher than the sensitivity of the normal FBG sensor. The sensitivity coefficient of PLA-AE-FBG2 sensor was 3.057, and that of PLA-AE-FBG1 was 2.0702. Through structural design and parameter optimization, the sensitivity and stability of the FBG AE sensor are improved. The four-loop shaped sensor is more suitable for the health monitoring in fields such as aero-engine blade, micro-crack of structure, and crack growth in bonded joints. While ensuring the sensing characteristics, sensitivity, and stability of the four-loop shaped sensor have been enhanced. It is possible to apply the FBG AE sensor in some complex engineering environments.

Carrier-suppressed return-to-zero to non-return-to-zero format conversion based on a single fiber Bragg grating with knife-shaped spectra

2014 ◽  
Vol 53 (25) ◽  
pp. 5649 ◽  
Author(s):  
Hui Cao ◽  
Javid Atai ◽  
Yu Yu ◽  
Bangyun Xiong ◽  
Yan Zhou ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Single Fiber ◽  
Bragg Grating ◽  
Format Conversion

Simultaneous displacement and temperature measurement with a single fiber Bragg grating

2000 ◽  
Author(s):  
Xinyong Dong ◽  
Dejun Feng ◽  
Lei Ding ◽  
Shuzhong Yuan ◽  
Xiaoyi Dong
Keyword(s):  
Temperature Measurement ◽  
Fiber Bragg Grating ◽  
Single Fiber ◽  
Bragg Grating

Gain-clamped erbium-doped fiber amplifier using a single fiber Bragg grating

2001 ◽  
Vol 29 (5) ◽  
pp. 290-293
Author(s):  
T. Subramaniam ◽  
M. A. Mahdi ◽  
P. Poopalan ◽  
S. W. Harun ◽  
H. Ahmad
Keyword(s):  
Fiber Bragg Grating ◽  
Fiber Amplifier ◽  
Single Fiber ◽  
Bragg Grating ◽  
Erbium Doped Fiber Amplifier ◽  
Erbium Doped

Investigation on Temperature Compensation of Fiber Bragg Grating Sensors for Hull Monitoring

2018 ◽  
Author(s):  
Ruiqi Ma ◽  
Guoqing Feng ◽  
Huilong Ren ◽  
Peng Fu ◽  
Shuang Wu ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Fiber Bragg Grating ◽  
Temperature Compensation ◽  
Compensation Method ◽  
Bragg Grating ◽  
Theoretical Derivation ◽  
Temperature Changes ◽  
Hull Girder ◽  
Fbg Sensor ◽  
Fbg Sensors

Hull monitoring system with Fiber Bragg Grating (FBG) sensors increasingly receives people’s attentions. However, for the ship hull monitoring, the deformation of hull girder changes a lot as is subjected to a huge temperature variation. Therefore, the compensation method with only FBG temperature self-correction is not suitable for the hull monitoring sensors because no material thermal expansion effects are reasonably included. In this paper, the new compensation method of hull monitoring FBG sensor based on the sensor theory with both FBG temperature self-correction and steel thermal expansion effects correction is studied. The coupled compensation method suitable for hull monitoring sensor is obtained by theoretical derivation. As the comparison, the coupled compensation experiment was carried out. The results show that the relative error under the temperature compensation method is large in the case of drastic strain and temperature changes, and the correction results of the tested method will be closer to the true level.

Ultrashort fiber Bragg grating written by femtosecond laser and its sensing characteristics

2017 ◽  
Vol 10 (4) ◽  
pp. 449-454 ◽  
Author(s):  
敬世美 JING Shi-mei ◽  
张轩宇 ZHANG Xuan-yu ◽  
梁居发 LIANG Ju-fa ◽  
陈超 CHEN Chao ◽  
郑钟铭 ZHENG Zhong-ming ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Sensing Characteristics

The Vibration Analysis of a Novel Vortex Flowmeter Based on Fiber Bragg Grating

2012 ◽  
Vol 485 ◽  
pp. 526-531 ◽  
Author(s):  
Hui Juan Dong ◽  
Yong Cai ◽  
Jun He ◽  
Ren Bing Liu
Keyword(s):  
Fiber Bragg Grating ◽  
Vibration Analysis ◽  
Axial Strain ◽  
Damping Ratio ◽  
Bragg Grating ◽  
Measuring Range ◽  
Fbg Sensor ◽  
Vortex Flowmeter ◽  
Acrylic Glass ◽  
Mass Spring

A novel fiber Bragg grating vortex flowmeter was designed in this work, where the Bragg grating was enfolded in a cylinder eddy generator. Bragg grating subject to force and the corresponding strain were analyzed. Subsequently, the relationships between grating’s axial strain and flow were developed. In order to improve the flowmeter's resolution, the system was simplified by a mass-spring-damper model, which was used to analyze resonance and choose acrylic glass as cylinder's material. In terms of the resolution of FBG sensor demodulation device and factors of vortex's formation, the measuring range of flowmeter is 1200L/h~5000L/h. The resolution is less than 40L/h with flow exceeding 2000L/h. The damping ratio is not sensitive to the flow when it is less than 2000L/h.

Sign in / Sign up

Export Citation Format

Share Document