A Novel Chirped Fiber Grating Sensor for Strain Detection

2011 ◽  
Vol 94-96 ◽  
pp. 1222-1226
Author(s):  
Hai Ying Yu ◽  
Xiao Liu ◽  
Tong Yu Liu ◽  
Lin Suo ◽  
Ling Song Yu
Keyword(s):  
Light Intensity ◽  
Temperature Compensation ◽  
Low Cost ◽  
Strain Sensor ◽  
Fiber Grating ◽  
Fiber Gratings ◽  
Fiber Grating Sensor ◽  
Chirped Fiber Grating ◽  
Strain Detection ◽  
Chirped Fiber Gratings

In this paper, a novel strain sensor based on chirped fiber grating with temperature compensation is presented. The proposed strain sensor uses double chirped fiber gratings. The temperature compensation exploit the principle that the wavelength shifts of these two chirped fiber gratings induced by temperature is consistent. This strain sensor is demodulated by the light intensity detection with low cost. Furthermore, the strain sensor is simulated in the end of this paper.

Fiber Bragg grating strain sensor demodulator using a chirped fiber grating

2001 ◽  
Vol 13 (8) ◽  
pp. 839-841 ◽  
Author(s):  
Sungchul Kim ◽  
Seungwoo Kim ◽  
Jaejoon Kwon ◽  
Byoungho Lee
Keyword(s):  
Fiber Bragg Grating ◽  
Strain Sensor ◽  
Bragg Grating ◽  
Fiber Grating ◽  
Chirped Fiber Grating

Drift-eliminating method of intensity demodulation on a chirped fiber grating strain sensor

2014 ◽  
Vol 53 (13) ◽  
pp. 2936 ◽  
Author(s):  
Jianjun Pan ◽  
Weilai Li ◽  
Jie Liu
Keyword(s):  
Strain Sensor ◽  
Fiber Grating ◽  
Chirped Fiber Grating

scholarly journals Improved-bonding linearly chirped fiber grating for a high-sensitivity surface-mounted strain sensor

2010 ◽  
Vol 49 (17) ◽  
pp. 3348 ◽  
Author(s):  
Gwo-Shyang Hwang ◽  
Ding-Wei Huang ◽  
Chien-Ching Ma
Keyword(s):  
Strain Sensor ◽  
High Sensitivity ◽  
Fiber Grating ◽  
Chirped Fiber Grating

Visible Light Assisted Hantzsch Reaction: Synthesis of Polycyclic Dihydropyridines

2019 ◽  
Vol 16 (8) ◽  
pp. 676-682
Author(s):  
Ankusab Noorahmadsab Nadaf ◽  
Kalegowda Shivashankar
Keyword(s):  
Reaction Time ◽  
Light Intensity ◽  
Ammonium Acetate ◽  
Low Cost ◽  
Aromatic Aldehydes ◽  
Light Irradiation ◽  
High Yield ◽  
Short Reaction Time ◽  
Green Protocol ◽  
Dihydropyridine Derivatives

The polycyclic dihydropyridine nucleus represents the heterocyclic system of invaluable core motifs with wide applications in chemical, biological and physical properties. Although this kind of compounds have been extensively synthesized by other groups, the synthesis of these compounds under CFL light intensity were not explored. The synthesis of polycyclic dihydropyridine derivatives were achieved through the reaction of 4-hydroxycoumarin, aromatic aldehydes and ammonium acetate under CFL light irradiation conditions. A series of polycyclic dihydropyridine derivatives were prepared under CFL light irradiation conditions with high yield, short reaction time, ambient condition and without the use of catalyst. The results displayed an efficient method for the synthesis of polycyclic dihydropyridine derivatives. Clean profile, short reaction time, low cost and use of CFL light intensity instead of catalyst making it a genuinely green protocol.

scholarly journals Development of a Long Period Fiber Grating Interrogation System Using a Multimode Laser Diode

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 749
Author(s):  
Luís Henrique Silva ◽  
Paulo Santos ◽  
Luís C. C. Coelho ◽  
Pedro Jorge ◽  
José Manuel Baptista
Keyword(s):  
Laser Diode ◽  
Measurement Errors ◽  
Laser Scanning ◽  
Fiber Grating ◽  
Light Sources ◽  
Fiber Gratings ◽  
Multimode Laser ◽  
Central Wavelength ◽  
Long Period ◽  
Multimode Laser Diode

Optical fiber gratings have long shown their sensing capabilities. One of the main challenges, however, is the interrogation method applied, since typical systems tend to use broadband light sources with optical spectrum analyzers, laser scanning units or CCD (Charged Coupled Device) spectrometers. The following paper presents the development of an interrogation system, which explores the temperature response of a multimode laser diode, in order to interrogate long period fiber gratings. By performing a spectral sweep along one of its rejection bands, a discrete attenuation spectrum is created. Through a curve fitting technique, the original spectrum is restored. The built unit, while presenting a substantially reduced cost compared with typical interrogation systems, is capable of interrogating along a 10 nm window with measurement errors reaching minimum values as low as 0.4 nm, regarding the grating central wavelength, and 0.4 dB for its attenuation. Given its low cost and reduced dimensions, the developed system shows potential for slow-changing field applications.

scholarly journals Wind Turbine Blade Monitoring with Brillouin-Based Fiber-Optic Sensors

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Agnese Coscetta ◽  
Aldo Minardo ◽  
Lucio Olivares ◽  
Maurizio Mirabile ◽  
Mario Longo ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Fiber Optic ◽  
Strain Sensor ◽  
Experimental Tests ◽  
Fiber Optic Sensors ◽  
Composite Blade ◽  
Operation Stability ◽  
Distributed Strain ◽  
Strain Detection

Wind turbine (WT) blade is one of the most important components in WTs, as it is the key component for receiving wind energy and has direct influence on WT operation stability. As the size of modern turbine blade increases, condition monitoring and maintenance of blades become more important. Strain detection is one of the most effective methods to monitor blade conditions. In this paper, a distributed fiber-optic strain sensor is used for blade monitoring. Preliminary experimental tests have been carried out over a 14 m long WT composite blade, demonstrating the possibility of performing distributed strain and vibration measurements.

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