scholarly journals A Fiber Bragg Grating Sensing Structure for the Design, Simulation and Stress Strain Monitoring of Human Puncture Surgery

Sensors ◽  
2019 ◽  
Vol 19 (14) ◽  
pp. 3066
Author(s):  
Pengwen Xiong ◽  
Xin Huang ◽  
Yulong Li ◽  
Peter X. Liu
Keyword(s):  
Fiber Bragg Grating ◽  
Axial Force ◽  
Simulation Analysis ◽  
Bragg Grating ◽  
Average Sensitivity ◽  
Bragg Wavelength ◽  
Determination Coefficient ◽  
New Type ◽  
The Difference ◽  
Force Calibration

In order to improve the precision and stability of puncture surgical operations to assist doctors in completing fine manipulation, a new of type puncturing needle sensor is proposed based on a fiber Bragg grating (FBG). Compared with the traditional puncture needle sensor, the new type of puncturing needle sensor is able to sense not only the axial force, but also the torque force during the puncture process. A spoke-type structure is designed near the needle tip. In order to eliminate the influence of temperature and realize temperature compensation, a reference fiber method using three FBGs is applied. FBG1 and the reference FBG2 are pasted on the upper and lower surfaces of the new-type elastic beam, and FBG3 is pasted into the groove on the surface of the new type of puncturing needle cylinder. The difference of Bragg wavelength between FBG1 and the reference FBG2 is calibrated with the torque force, while the difference between the Bragg wavelength of the FBG3 and the reference FBG2 is calibrated with the axial force. Through simulation and sensing tests, when the torque force calibration range is 10 mN·m, the torque average sensitivity is 22.8 pm/mN·m, and the determination coefficient R2 is 0.99992, with a hysteresis error YH and repetition error YR of 0.03%FS and 0.81%FS, respectively. When the axial force calibration rang is 5 N, the axial force average sensitivity is 0.089 nm/N, and the determination coefficient R2 is 0.9997, with hysteresis error YH and repetition error YR of 0.014%FS and 0.11%FS, respectively. The axial force resolution and torque resolution of the new type of puncturing needle sensor are 0.03 N and 0.8 mN·m, respectively. The experimental data and simulation analysis show that the proposed new type of puncturing needle sensor has good practicability and versatility.

Monitoring of Tunnel Second Lining and Steel Lining by Using Fiber Bragg Grating Strain Sensor

2013 ◽  
Vol 330 ◽  
pp. 479-484
Author(s):  
Ying Na Li ◽  
Xiao Yong Cao ◽  
Tao Xie ◽  
Zhen Gang Zhao ◽  
Ya Ping Zhou ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Steel Plate ◽  
Strain Sensor ◽  
Tunnel Lining ◽  
Surface Strain ◽  
Bragg Grating ◽  
Bragg Wavelength ◽  
Measurement Results ◽  
Operation Period ◽  
The Difference

Dong Yang Tunnel is located in the low mountains and hilly areas with tectonic denudation, where the tunnel of K147+535~K147+575 passes mainly through the maroon and purple red completely weathered mudstone. A differential fiber Bragg grating strain sensor is developed for monitoring the surface strain of tunnel lining. By converting the strain of gauge rod into the strain of beam, two fiber Bragg gratings are separately mounted on the top and bottom surfaces of beam, and as a result shifts its Bragg wavelength. The difference of relative Bragg wavelength shifts of the sensing gratings is 1.05×10-6/. Grating sensors are installed on the tunnel lining of K147+540~K147+610. Especially, the second lining of K147+592~K147+598 is enhanced by the steel plate. The strains of >100 occur on the lining of K147+560 and K147+590 in the reinforcing period of 20 days. Following a 160 days operation period, the measurement results indicate that the tunnel structures are gradually tending towards stability.

Development of Fiber Bragg Grating (FBG) as Temperature Sensor Inside Packed-bed Non-thermal Plasma Reactor

2014 ◽  
Vol 68 (3) ◽  
Author(s):  
Siti Musliha Aishah Musa ◽  
RK Raja Ibrahim ◽  
Asrul Izam Azmi
Keyword(s):  
Fiber Bragg Grating ◽  
Temperature Variation ◽  
Thermal Plasma ◽  
Temperature Sensor ◽  
Plasma Reactor ◽  
Packed Bed ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Bragg Wavelength ◽  
Non Thermal Plasma

This paper presents early work on Fiber Bragg grating (FBG) as temperature sensor to monitor temperature variation inside a packed-bed non-thermal plasma reactor. FBG made from germania-doped fiber with center Bragg wavelength of 1552.5 nm was embedded inside non-thermal plasma reactor with sphere shape dielectric bead (barium titanate) and used to probe the temperature variation inside the reactor. The experimental works have proven that FBG is a suitable sensor to monitor temperature variation inside of reactor via LabVIEW program. Besides that, Optical Spectrum Analyzer (OSA) recorded Bragg wavelength shift as voltage of power supply increases, which indicate the non-uniform temperature variation occurring inside the reactor. However, it does not affect the chemical reaction inside the reactor because the temperature condition is in steady state.

Design of a Sensor System Using Fiber Bragg Grating for Liquid Level and Liquid Density Measurement

2020 ◽  
Vol 18 (12) ◽  
pp. 889-893
Author(s):  
Kalyan Biswas
Keyword(s):  
Fiber Bragg Grating ◽  
Density Measurement ◽  
Sensor System ◽  
Liquid Level ◽  
Bragg Grating ◽  
Liquid Density ◽  
Bragg Wavelength ◽  
Sensing System ◽  
System A ◽  
Level Monitoring

In this work, a simple but versatile sensing system for very accurate sensing of liquid level and liquid density is presented. The sensor works based on basic strain sensitivity of Fiber Bragg Grating (FBG) and principle of liquid obeying Archimedes’ law of buoyancy. In this system, a cylindrical shaped mass suspended from a Fiber Bragg Grating and partially immersed in the liquid to be sensed. If the liquid level in the container or liquid density varies, that change the up thrust on the suspended mass and load on the Fiber will be changed accordingly. The change in the load on Fiber changes strain on the FBG and the reflected Bragg wavelength also changes. The proposed device with proper calibration should be able to carry out real time and nonstop liquid level and liquid density measurements. A mathematical analysis of the system considering liquid properties and geometrical structure of the suspended mass is presented here. Sensitivity of the system for liquid level monitoring is also reported. Achieved results shows the path for the utilization of the proposed sensor system for precise liquid density measurement and liquid level sensing in very large storage tanks used for commercial/residential applications.

scholarly journals Dynamic Deformation Reconstruction of Variable Section WING with Fiber Bragg Grating Sensors

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3350 ◽  
Author(s):  
Zhen Fu ◽  
Yong Zhao ◽  
Hong Bao ◽  
Feifei Zhao
Keyword(s):  
Finite Element ◽  
Fiber Bragg Grating ◽  
Real Time ◽  
Beam Theory ◽  
Reconstruction Algorithm ◽  
Support Vector ◽  
Bragg Grating ◽  
Variable Section ◽  
The Difference ◽  
Fuzzy Network

In order to monitor the variable-section wing deformation in real-time, this paper proposes a dynamic reconstruction algorithm based on the inverse finite element method and fuzzy network to sense the deformation of the variable-section beam structure. Firstly, based on Timoshenko beam theory and inverse finite element framework, a deformation reconstruction model of variable-section beam element was established. Then, considering the installation error of the fiber Bragg grating (FBG) sensor and the dynamic un-modeled error caused by the difference between the static model and dynamic model, the real-time measured strain was corrected using a solidified fuzzy network. The parameters of the fuzzy network were learned using support vector machines to enhance the generalization ability of the fuzzy network. The loading deformation experiment shows that the deformation of the variable section wing can be reconstructed with the proposed algorithm in high precision.

scholarly journals Etched Fiber Bragg Grating Biosensor Functionalized with Aptamers for Detection of Thrombin

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4298 ◽  
Author(s):  
Aliya Bekmurzayeva ◽  
Kanat Dukenbayev ◽  
Madina Shaimerdenova ◽  
Ildar Bekniyazov ◽  
Takhmina Ayupova ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Chemical Vapor ◽  
Bragg Grating ◽  
Clinical Settings ◽  
Long Period Grating ◽  
Bragg Wavelength ◽  
Sensing System ◽  
Index Unit

A biosensor based on an etched Fiber Bragg Grating (EFBG) for thrombin detection is reported. The sensing system is based on a Fiber Bragg Grating (FBG) with a Bragg wavelength of 1550 nm, wet-etched in hydrofluoric acid (HF) for ~27 min, to achieve sensitivity to a refractive index (RI) of 17.4 nm/RIU (refractive index unit). Subsequently, in order to perform a selective detection of thrombin, the EFBG has been functionalized with silane-coupling agent 3-(aminopropyl)triethoxysilane (APTES) and a cross-linker, glutaraldehyde, for the immobilization of thrombin-binding aptamer. The biosensor has been validated for thrombin detection in concentrations ranging from 10 nM to 80 nM. The proposed sensor presents advantages with respect to other sensor configurations, based on plasmonic resonant tilted FBG or Long Period Grating (LPG), for thrombin detection. Firstly, fabricating an EFBG only requires chemical etching. Moreover, the functionalization method used in this study (silanization) allows the avoidance of complicated and expensive fabrications, such as thin film sputtering or chemical vapor deposition. Due to their characteristics, EFBG sensors are easier to multiplex and can be used in vivo. This opens new possibilities for the detection of thrombin in clinical settings.

Design of Remote Test System for Fiber Bragg Grating Based on LabVIEW

2013 ◽  
Vol 694-697 ◽  
pp. 992-996
Author(s):  
Chun Tong Liu ◽  
Yang Zhang ◽  
Zhen Xin He ◽  
Hong Cai Li
Keyword(s):  
Fiber Bragg Grating ◽  
Data Storage ◽  
Test System ◽  
Fiber Optic Sensor ◽  
Bragg Grating ◽  
Testing System ◽  
Sensing System ◽  
Actual Use ◽  
New Type ◽  
Control Port

As a new type of wavelength modulated fiber optic sensor, Fiber Bragg Grating (FBG) has been widely used in many fields. The majority of FBG demodulation device just detect the absolute wavelength, however, the change of wavelength is often concerned in actual use. For the purpose of realizing the FBG sensing system automated test, using the remote control port of the Q8384 spectrometer and the LabVIEW language to develop the remote automation testing system, and with the friendly interface of FBG sensing test interface. Realized the real-time monitoring and data storage capabilities by the processing of the collecting data and the FBG sensing remote test system is more practical.

Study on Fiber Bragg Grating Large Current Sensor

2013 ◽  
Vol 823 ◽  
pp. 513-516
Author(s):  
Xin Wang ◽  
Jun Lin Wang
Keyword(s):  
Fiber Bragg Grating ◽  
Rogowski Coil ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Bragg Wavelength ◽  
Large Power ◽  
Giant Magnetostrictive Material ◽  
Large Current ◽  
Current Detection ◽  
Detection Unit

The large power current is sampled by Rogowski coil, then transforms the sampling signals from AC to DC and regulates the signals, the current detection unit is formed with FBG (Fiber Bragg Grating) and GMM (Giant Magnetostrictive Material), the current measurement is achieved based on the F-P interferometer filter demodulation system, finally, linear relationship between the Bragg wavelength shift and external current is validated by experiment.

Fiber Bragg grating radiation-response dependency on the Bragg wavelength

2016 ◽  
Author(s):  
A. Morana ◽  
E. Marin ◽  
S. Girard ◽  
C. Marcandella ◽  
J. Périsse ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Radiation Response ◽  
Bragg Grating ◽  
Bragg Wavelength

Fiber Bragg Grating Demodulation System Based on Equi-Intensity Cantilever Beam

2010 ◽  
Vol 437 ◽  
pp. 359-363
Author(s):  
Hong Li ◽  
Wei Ping Yan ◽  
Ren Sheng Shen ◽  
Ben Yu Wang
Keyword(s):  
Fiber Bragg Grating ◽  
Cantilever Beam ◽  
Optical Spectrum ◽  
Optical Signal ◽  
Electrical Signal ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Optical Spectrum Analyzer ◽  
Bragg Wavelength ◽  
Scanning Velocity

Optical spectrum analyzer (OSA) can achieve the higher precision and sensitivity, but it is disadvantageous for translating optical signal into electrical signal. A fiber Bragg grating (FBG) matched filtering system based on equi-intensity cantilever beam was presented in this paper. Strain characteristics in different location of cantilever beam were described, and the strain sensitivity of matching grating demodulation based on equi-intensity cantilever beam was deduced mathematically. Strain characteristics of cantilever beam were verified, and the sensing effect of the system was tested. The Bragg wavelength shift range of the demodulating FBG placed on the cantilever beam reached 10 nm, and scanning velocity was 0.125 nm/s. The system could demodulate slow-altered sensing signal accurately and rapidly.

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