scholarly journals Simultaneous Measurement of Temperature and Strain Based on Peak Power Changes and Wavelength Shift Using Only One Uniform Fiber Bragg Grating

2021 ◽  
Author(s):  
abdollah malakzadeh ◽  
mohsen mansoursamaei ◽  
Rasoul Pashaie
Keyword(s):  
Fiber Bragg Grating ◽  
Cantilever Beam ◽  
Simultaneous Measurement ◽  
Strain Distribution ◽  
Peak Power ◽  
Quadratic Function ◽  
Uniform Strain ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Bragg Wavelength

Abstract Many efforts have been devoted to simultaneous measurements of strain and temperature by FBG sensors and several improving techniques have been resulted and implemented on the measurement. Most of them are based on two or more FBGs configurations or a single non-uniform FBG implementation. We propose simultaneous measurement of temperature and strain based on peak power changes and Bragg wavelength shifts using only one uniform fiber Bragg grating (FBG). We placed a ramp with the angle of θ, similar to a tilted cantilever beam, on an assumptive structure and stuck a uniform FBG on it. When a uniform strain applied to a structure, the cantilever beam converts it to a non-uniform strain distribution along with itself and consequently the uniform FBG. By creating this non-uniform strain distribution, the peak power of the reflection spectrum of the FBG will be sensitive to strain changes. In addition, the Bragg wavelength shift will be sensitive to both temperature and strain parameters. According to our simulation, temperature sensitivity of 14.15 pm/℃ is obtained for FBG sensor without any changes in the peak power. The strain sensitivity of 0.7837 pm/µε, and a nonlinear sensitivity according to a quadratic function for peak power variation are also observed.

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.

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.

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.

Monitoring of Microorganisms Growth Process Based on Fiber Bragg Grating Biosensor

2011 ◽  
Vol 84-85 ◽  
pp. 586-589
Author(s):  
Ming Fu Zhao ◽  
De Yi Huang ◽  
Lei Zi Jiao ◽  
Xue Mei Cao ◽  
Xi Han
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Nonlinear Behavior ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Refractive Index Sensitivity ◽  
Bragg Wavelength ◽  
Index Changes ◽  
Index Sensitivity ◽  
The Relationship

The low refractive index sensing principle of the fiber Bragg grating (FBG) was analyzed theoretically, the temperature compensation scheme corresponding to the theoretical model was established. A single-end etched FBG was designed and fabricated for simultaneous measurement of temperature and refractive index. The experimental results demonstrated that the Bragg wavelength shift exhibits a nonlinear behavior with the temperature and yeast refractive index changes. The temperature change to the influence of the sensor was eliminated by numerical analysis, and then the relationship between the Bragg wavelength shift and the yeast refractive index is linear, the sensor yeast refractive index sensitivity of 5.42nm/riu was obtained.

Application of Fiber Bragg Grating Sensor coated with Polyaniline as an optical Sensor for chloroform detection

2017 ◽  
Vol 25 (7) ◽  
pp. 555-562
Author(s):  
Irma Zulayka Mohamad Ahad ◽  
Sulaiman Wadi Harun ◽  
Seng neon Gan ◽  
Sook Wai Phang
Keyword(s):  
Thin Film ◽  
Fiber Bragg Grating ◽  
Optical Sensor ◽  
Fast Response ◽  
Chemical Oxidation ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Peak Ratio ◽  
Bragg Wavelength ◽  
Fbg Sensor

Fiber Bragg Grating (FBG) sensor coated with PAni was designed as a sensing device in chloroform detection. PAni thin film was synthesized through chemical oxidation method by using aniline (Ani) as a monomer, ammonium persulphate (APS) as an initiator and dioctyl sodium sulfosuccinate (AOT) as a dopant. The chemical structure of PAni thin film was confirmed by using Fourier transform infrared (FTIR) and ultraviolet-visible (UV-Vis) spectrometer. The conducting behaviour of PAni thin film (1.157 × 10−2 S/cm) was determined by using four-point probe measurement. In the optical sensor part, FBG was etched in hydrofluoric acid solution (48% HF) to remove the cladding layer on fiber before coated with PAni. The response of this sensor was monitored based on the different of Bragg wavelength shift at ∼1557 nm in an optical spectrum analyzer (OSA) detector. PAni-coated FBG significantly increased in the Bragg wavelength shift (sensitivity = 0.0009) compared with uncoated FBG (sensitivity = 0.0002). The interaction between PAni and chloroform was significantly confirmed by the “polaron peak ratio” (Pf/Pi) and “quinoid and benzenoid peak ratio” (IQ/ IB) through UV-vis and FTIR spectroscopy analysis. In this study, FBG sensor coated with PAni thin film had been found as an efficient sensor in chloroform detection with fast response time (7 s).

Chemical Sensors Based on Fiber Bragg Grating

2011 ◽  
Vol 84-85 ◽  
pp. 582-585 ◽  
Author(s):  
Ming Fu Zhao ◽  
De Yi Huang ◽  
Bin Zhou ◽  
Lei Zi Jiao
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Chemical Sensor ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Bragg Wavelength ◽  
Chemical Substances ◽  
Fbg Sensor ◽  
Surrounding Refractive Index ◽  
The Relationship

In this paper, measurement method for the refractive index of chemical substances based on fiber Bragg grating (FBG) sensor was proposed. The relation between Bragg wavelength shift and surrounding refractive index (SRI) was analyzed theoretically and experimentally. The SRI sensitivity of the chemical sensor could be enhanced by reducing the cladding thickness of the FBG using hydrofluoric acid (HF) solution etching process. The experimental results indicated that the variation of Bragg wavelength increased as the SRI increased. In the low SRI region, the relationship between the Bragg wavelength shift and the change of the SRI was approximately linear.

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