scholarly journals Fiber Bragg Grating Monitoring of Full-bolt Axial Force of the Bolt in the Deep Strong Mining Roadway

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4242
Author(s):  
Peng Wang ◽  
Nong Zhang ◽  
Jiaguang Kan ◽  
Zhengzheng Xie ◽  
Qun Wei ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Axial Force ◽  
Growth Zone ◽  
Bragg Grating ◽  
Fiber Grating ◽  
Monitoring Method ◽  
Mining Depth ◽  
Working Face ◽  
Before And After ◽  
Mine Roadway

With the increase of mining depth and strength, the evolution of bolt axial force is increasingly becoming important for ensuring the reliability and safety of support. To improve the problem of the existing coal mine roadway pressure-monitoring method, whereby it is difficult to continuously monitor the axial force of the bolt over a long period of time, a full rod fiber bragg grating (FBG) force-measuring bolt and system were designed based on the principle of fiber grating sensing. It was found that a trapezoidal groove is a relatively better groove. The linearity between the center wavelength offset of the fiber grating and the axial force was more than 0.99, and the conversion formula between the axial force of the bolt rod and the wavelength change of the fiber grating were obtained. The real-time monitoring revealed that the axial force of the bolt obviously changed before and after compression. The axial force distribution curve can be divided into the stable zone, growth zone, and peak zone. The influence of the roadway abutment pressure was approximately 130 m ahead of the working face, and the peak area was within the 25–35 m range of the advance working face. The axial force of the bolt rod at the end of the anchorage linearly increased with the tail end of the bolt, the axial force of the free segment was the largest, and the overall stress was essentially the same. The application results demonstrate the feasibility and effectiveness of the FBG full-length force bolt.

scholarly journals A Temperature-Insensitive FBG Acceleration Sensor with Sinusoid-Shaped Curved Beams

2020 ◽  
Author(s):  
Li Hong ◽  
Yuzi Zhang ◽  
Ruwang Mu ◽  
Yanan Li ◽  
Zhongchao Qiu
Keyword(s):  
Fiber Bragg Grating ◽  
Natural Frequency ◽  
Structural Damage ◽  
Double Cantilever Beam ◽  
Bragg Grating ◽  
Fiber Grating ◽  
Acceleration Sensor ◽  
Curved Beams ◽  
Before And After ◽  
Important Means

Abstract It is an important means to identify and evaluate the structural damage of buildings before and after earthquake disaster by using fiber Bragg grating acceleration sensor to obtain the natural frequency of building structure. In order to solve the problem of temperature cross sensitivity of fiber Bragg grating (FBG) in structural health monitoring, a novel acceleration sensor based on strain chirp effect which is insensitive to temperature is proposed. A kind of M-shaped double cantilever beam structure is developed. The fiber grating is pasted in the gradient strain region of the beam, and the chirp effect is produced under the action of non-uniform stress, and then the change of acceleration is converted into the change of reflection bandwidth to demodulate and eliminate the temperature interference. Through theoretical analysis, simulation and experimental verification with rectangular beam sensor. The results show that the sinusoidal curvature beam sensor is insensitive to the change of temperature and is more likely to produce chirp effect. The sensitivity is about 317 pm/g, and the natural frequency is 56 Hz.

scholarly journals Errata: Method to athermalize a long-period fiber grating for interrogation of fiber Bragg grating–based sensors

2014 ◽  
Vol 53 (10) ◽  
pp. 109801 ◽  
Author(s):  
Venkata Reddy Mamidi ◽  
Srimannarayana Kamineni ◽  
L. N. Sai Prasad Ravinuthala ◽  
Venkatapparao Thumu ◽  
Vengal Rao Pachava
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Period Fiber Grating

Deflection monitoring method for two-dimensional structure based on fiber Bragg grating sensors measurements

2019 ◽  
Author(s):  
Pasquale Di Palma ◽  
Giovanna Palumbo ◽  
Massimo Della Pietra ◽  
Vincenzo Canale ◽  
Mariagrazia Alviggi ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Dimensional Structure ◽  
Bragg Grating ◽  
Two Dimensional ◽  
Monitoring Method ◽  
Fiber Bragg Grating Sensors

Fiber Bragg Grating Force Sensing System with Temperature Compensation Scheme

2013 ◽  
Vol 711 ◽  
pp. 486-490 ◽  
Author(s):  
Min Yuan Hsieh ◽  
Chia Chin Chiang ◽  
Jian Cin Chao
Keyword(s):  
Fiber Bragg Grating ◽  
Temperature Compensation ◽  
Force Sensing ◽  
Bragg Grating ◽  
Modulation Scheme ◽  
Fiber Grating ◽  
Average Temperature ◽  
Long Period ◽  
Sensing System ◽  
Period Fiber Grating

Current study presented a simple, temperature-insensitive fiber Bragg grating (FBG) force sensing system. It is based on an optical intensity modulation scheme with a corrugated long-period fiber grating (CLPFG) filter. The temperature effect of signal variation is about 6%. Through FBG temperature compensating scheme the average temperature sensitivity is improved obviously (0.06 mV/°C).

Applications of Fiber Bragg Grating in Strain Measurement of Concrete Bridge

2011 ◽  
Vol 368-373 ◽  
pp. 2286-2290
Author(s):  
Xian Xi Tang ◽  
Xian Zhou Tang ◽  
Yue Xu ◽  
Wei Guo
Keyword(s):  
Fiber Bragg Grating ◽  
Strain Gauge ◽  
Strain Measurement ◽  
Fatigue Loading ◽  
Good Effect ◽  
Bragg Grating ◽  
Fiber Grating ◽  
Concrete Bridge ◽  
Experimental Researches

In order to verify the role of fiber bragg grating strain gauge in strain measurement of concrete bridge, and the influence of concrete and steel strain properties by fatigue loading, the relevant experimental researches were carried out. The results indicated that the Fiber Bragg grating strain gauge could reflect the strain regularity of concrete and steel well; for the fiber grating strain rosettes inside the concrete, the pasting equipments of fiber gratings had a certain impact of the measurement effect. The fatigue loading had a certain impact of the properties of concrete and steel, in conditions of the same number of fatigue, the greater the stress amplitude the more obvious the effects. The results analysis shown that, fiber grating strain measurement innovated the means and methods of strain measurement in detailed structure of the concrete bridge, for the strain measurements of concrete bridge under fatigue loading, the FBG could still play very good effect.

Use Piezoelectric Bimorph for the Fiber Bragg Grating Tuner

2010 ◽  
Vol 143-144 ◽  
pp. 196-200
Author(s):  
Xiao Li Zhang ◽  
Da Kai Liang ◽  
Jie Zeng
Keyword(s):  
Fiber Bragg Grating ◽  
Tuning Range ◽  
High Efficiency ◽  
Optical Filter ◽  
Bragg Grating ◽  
Operating Voltage ◽  
Piezoelectric Bimorph ◽  
Central Wavelength ◽  
Tunable Optical Filter ◽  
Before And After

A wavelength tunable optical filter based on a fiber Bragg grating using piezoelectric bimorph is realized in this paper, and the tuning condition is theoretically and experimentally analyzed. The Bragg central wavelength of the filter can be easily tuned adopting to a DC voltage. The maximum strain of the central wavelength depends upon the maximum operating voltage, and the tuning range efficiency was as high as 1.2pm/V, the reflectivity, shape and the reflective spectrums of the fiber Bragg grating central wavelength almost keep unchanged before and after tunning. This paper provides a reference for optical fiber Bragg grating tuner.with high efficiency.

Method to athermalize a long-period fiber grating for interrogation of fiber Bragg grating–based sensors

2014 ◽  
Vol 53 (9) ◽  
pp. 096111 ◽  
Author(s):  
Venkata Reddy Mamidi ◽  
Srimannarayana Kamineni ◽  
L. N. Sai Prasad Ravinuthala ◽  
Venkatapparao Thumu ◽  
Vengal Rao Pachava
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Period Fiber Grating
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