scholarly journals Fiber Bragg Grating-Based Sensors and Systems

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8225
Author(s):  
Oleg G. Morozov
Keyword(s):  
Biological Activity ◽  
Fiber Bragg Grating ◽  
Structural Integrity ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Living Systems ◽  
Bragg Grating ◽  
Physical Parameters ◽  
Engineering Systems

Today, no one doubts that fiber Bragg gratings (FBGs) have become the most used tool for measuring various physical parameters, the structural integrity of engineering systems, and the biological activity of living systems [...]

A Package for Thermal Compensation of Fiber Bragg Gratings

2003 ◽  
Author(s):  
Alison L. Howlett ◽  
Luc J. Vandeperre ◽  
William J. Clegg
Keyword(s):  
Fiber Bragg Grating ◽  
Temperature Change ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Bragg Grating ◽  
Thermal Compensation ◽  
Non Linear

A new package for thermally compensating a fiber Bragg grating, which requires less accuracy in positioning the fiber onto the device, is discussed. Experiments show that it can reduce the shift in reflected wavelength from 1575 pm to 78 pm for a temperature change of 120 K. The deformation of the package showed no hysteresis, and the effective thermal compensation is repeatable over many cycles. Furthermore the package also has the potential to give non-linear thermal compensation for fiber Bragg gratings.

scholarly journals Fiber Bragg grating fabrication by femtosecond laser radiation

2019 ◽  
Vol 220 ◽  
pp. 03007
Author(s):  
Anton Chernikov ◽  
Dmitriy Kochuev ◽  
Kirill Khorkov ◽  
Ruslan Chkalov ◽  
Nikolay Davydov
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Fiber Bragg Grating ◽  
Fiber Optic ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Fiber Optic Sensors ◽  
Bragg Grating ◽  
Femtosecond Laser Radiation ◽  
Grating Fabrication

The paper presents the results of fiber Bragg gratings fabrication by femtosecond laser radiation using point-by-point and line-by-line inscription methods. The approach makes it possible to fabricate the second and higher diffraction orders fiber Bragg gratings, which can be used as sensitive elements of fiber-optic sensors.

scholarly journals ANALYSIS OF METROLOGICAL PROPERTIES FIBER BRAGG GRATINGS WITH A CONSTANT AND VARIABLE PERIOD

2018 ◽  
Vol 8 (2) ◽  
pp. 62-67
Author(s):  
Tomasz Zieliński ◽  
Piotr Kisała
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Periodic Structures ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Bragg Grating ◽  
Variable Period ◽  
Accuracy Of Measurements

The paper presents periodic structures in terms of metrological properties in the distinction for a fiber Bragg grating (FBG) with a constant and changeable period. The process of their formation and characteristics as well as applications in many areas have been described. On the basis of the literature, the results of research and measurements of measurable quantities such as temperature and stress made by periodic structures applied to the fiber of the optical fiber are presented. Analysis of the presented measurements allowed to mark the ranges and accuracy of measurements of individual applications.

scholarly journals Fiber Bragg Grating Sensors and Sensor Arrays

2008 ◽  
Vol 55 ◽  
pp. 138-144 ◽  
Author(s):  
Hartmut Bartelt
Keyword(s):  
Fiber Bragg Grating ◽  
Near Infrared ◽  
Fiber Bragg Gratings ◽  
Small Diameter ◽  
Wavelength Region ◽  
Bragg Gratings ◽  
Bragg Grating ◽  
Fiber Grating ◽  
Sensor Systems ◽  
Widespread Application

Fiber Bragg gratings have found widespread application in sensor systems, e. g. for temperature, strain or refractive index measurements. The concept of fiber Bragg gratings allows also in a simple way the realisation of arrays of such sensors. The development of such optical fiber sensor systems often requires special fibers and grating structures which may go beyond more conventional Bragg grating structures in typical communication fibers. Concerning fibers there is, for example., a need of achieving fiber gratings in small diameter fibers and fiber tapers as well as in microstructured fibers. Special fiber grating structures are of interest e.g. in the visible wavelength range, which requires smaller spatial structures compared to more conventional gratings in the near infrared wavelength region. Examples for such modern developments in fiber Bragg grating technology for sensor applications will be presented and discussed.

Researches of the Differential Fiber Bragg Grating Seepage Pressure Sensor

2013 ◽  
Vol 364 ◽  
pp. 223-227
Author(s):  
Bi He ◽  
De Li Li ◽  
Chuan Li ◽  
Ying Na Li ◽  
Ya Ping Zhou
Keyword(s):  
Fiber Bragg Grating ◽  
Pressure Sensor ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Pore Fluid ◽  
Bragg Grating ◽  
Seepage Pressure ◽  
Repeatability Error ◽  
Metal Bellows ◽  
The Stability

Seepage pressure is the pressure of pore fluid inside soil, which directly influences the stability state of engineering structure. A differential fiber Bragg grating seepage pressure sensor is developed, in which two fiber Bragg gratings are respectively pasted on the top and bottom surfaces of the uniform intensity cantilever. Acted as the seepage pressure measurement cavity, the free end of metal bellows is connected to the cantilever girder free end. Under the pressure of pore fluid function, the engender axial displacement of metal bellows is converted to the deflection change of cantilever girder free end, which generates the wavelength shifts of two pasted fiber Bragg gratings. The experiment results of pressure loading and unloading show that the sensitivity of the sensor is 1.96 nm/ MPa, the repeatability error is 2.27% FS, and the nonlinear error is 1.7% FS.

Characterization of process-induced defects in automated fiber placement manufacturing of composites using fiber Bragg grating sensors

2017 ◽  
Vol 17 (1) ◽  
pp. 108-117 ◽  
Author(s):  
Ebrahim Oromiehie ◽  
B Gangadhara Prusty ◽  
Paul Compston ◽  
Ginu Rajan
Keyword(s):  
Fiber Bragg Grating ◽  
Structural Integrity ◽  
Bragg Grating ◽  
Inspection Method ◽  
Manufacturing Defects ◽  
Fiber Placement ◽  
Fiber Bragg Grating Sensors ◽  
Placement Method ◽  
Automated Fiber Placement ◽  
On Line

With the increasing use of automated fiber placement method for manufacturing highly precise bespoke composite components in the aerospace industry, the level of manufacturing defects within the laminate structure needs to be monitored and minimized for structural integrity. One of the main common defects in automated fiber placement process is misalignment between the tape paths in successive courses which leads to non-integrity of laminate and consequently significant reduction in mechanical strength of the laminate. Therefore, it is necessary to find an appropriate inspection method to monitor and identify these processing defects at the earlier stages of manufacturing. Since optical fiber Bragg grating sensors are being increasingly utilized for structural health monitoring in composite materials and as they were successfully implemented by Oromiehie et al. in their earlier work for on-line lay-up process monitoring, the same methodology is once again tried for identifying the misalignment defects in automated fiber placement process. The experiments are carried out on glass-fiber/nylon laminate with embedded fiber Bragg gratings for the automated tape placement method. The defects due to misalignment are identified by the fiber Bragg grating sensors through their reflected wavelength changes during the automated manufacturing process. The analysis of results indicates that the fiber Bragg grating sensors can be reliably implemented for on-line defect monitoring during the automated fiber placement process to ensure the quality of final product and maintain the expected design life.

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