Optical fiber static strain sensors: reliability issues

2007 ◽  
Author(s):  
Indu Saxena ◽  
Kaleonui Hui
Keyword(s):  
Optical Fiber ◽  
Strain Sensors ◽  
Static Strain

Characterization of Optical Fiber Bragg Gratings as Strain Sensors Considering Load Direction

2008 ◽  
Author(s):  
Michael C. Emmons ◽  
Sunny Karnani ◽  
K. P. Mohanchandra ◽  
Gregory P. Carman ◽  
Stefano Trono ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Strain Sensors ◽  
Great Promise ◽  
Fiber Direction ◽  
Load Direction ◽  
Isotropic Composite ◽  
Loading Direction

This study investigates the influence of lay-up and load direction on embedded optical fiber Bragg gratings (FBGs) used as strain sensors. FBGs have shown great promise for application to structural health monitoring with advantages of small size and cylindrical geometry readily allowing for embedment within fiber reinforced composites. Characterization of the embedded FBGs is necessary to develop a rugged and reliable strain sensor. This paper specifically explores the effects of loading direction on the FBG strain outputs. A well behaved baseline case is established with results for gratings loaded parallel to the optical fiber direction while embedded parallel to the adjacent structural fibers in a quasi-isotropic composite. Results and analysis are also presented for a case involving a composite fabricated with the optical and structural fibers parallel to each other but perpendicular to the loading direction. Extremely good results are obtained relating FBG strain measurements with that of surface mounted resistance strain gauges.

Optical-fiber strain sensors with asymmetric etched structures

1993 ◽  
Vol 32 (31) ◽  
pp. 6399 ◽  
Author(s):  
Masoud Vaziri ◽  
Chin-Lin Chen
Keyword(s):  
Optical Fiber ◽  
Strain Sensors

scholarly journals Ultrahigh resolution fiber-optic quasi-static strain sensors for geophysical research

2013 ◽  
Vol 3 (4) ◽  
pp. 295-303 ◽  
Author(s):  
Zuyuan He ◽  
Qingwen Liu ◽  
Tomochika Tokunaga
Keyword(s):  
Fiber Optic ◽  
Strain Sensors ◽  
Geophysical Research ◽  
Ultrahigh Resolution ◽  
Static Strain

scholarly journals Numerical Analysis of the Effect of Microscale Components Interaction on Measurements of Fiber Optic Strain Sensors Used in Composite Structures

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Mikhail Tashkinov ◽  
Igor Shardakov
Keyword(s):  
Composite Material ◽  
Numerical Analysis ◽  
Optical Fiber ◽  
Composite Structures ◽  
Fiber Optic ◽  
Strain Tensor ◽  
Strain Sensors ◽  
Numerical Estimation ◽  
Structural Components ◽  
Fiber Optic Strain Sensors

The paper investigates the influence of structural components of a composite material on the strain values measured by using an embedded optical fiber with Bragg gratings. The effect of composite plies and intermediate epoxy layers on the transfer of deformations from the measured object to the optical fiber was studied taking into account various methods of the fiber attachment and surrounding media configurations. A numerical estimation of the effect of the longitudinal and transverse components of the strain tensor on the wavelength of the reflected spectrum is performed.

scholarly journals Dynamic and quasi-static signal separation method for bridges under moving loads based on long-gauge FBG strain monitoring

2019 ◽  
Vol 38 (2) ◽  
pp. 388-402
Author(s):  
Huaxi Lu ◽  
Zhicheng Gao ◽  
Bitao Wu ◽  
Zhenwei Zhou
Keyword(s):  
Health Monitoring ◽  
Strain Sensors ◽  
Separation Method ◽  
Signal Separation ◽  
Dynamic Monitoring ◽  
Static Strain ◽  
Strain Monitoring ◽  
Important Means ◽  
Vehicle Loads ◽  
Strain Signal

Structural health monitoring is an important means of obtaining the state information of bridges, and the extracted quasi-static strain signal can reflect the stress state of bridges directly. However, the strain signals acquired during the operation stage of bridges are dynamic, and the strain gauges used in the health monitoring system are short (no more than 10 cm), which means they are easily affected by small damage at the installation parts of bridges and thereby the monitoring signal abnormalities occur. A type of externally affixed long-gauge fiber strain gauge is used to monitor the health of bridges, and the dynamic and quasi-static signal separation method for long-gauge strain sensors is studied under different vehicle loads; at the same time, the dynamic monitoring performance of the long-gauge sensor is investigated in this paper. The quasi-static strain signal extracted from the dynamic macro-strain signal can be used to directly monitor the stress status of the bridge. The results show that the method proposed in this paper is feasible for extracting the quasi-static macro-strain from a dynamic long-gauge strain signal.

J0404-5-4 Measurement of strain and deformation distribution by optical fiber strain sensors

2010 ◽  
Vol 2010.6 (0) ◽  
pp. 311-312
Author(s):  
Kazuki TACHIBANA ◽  
Hideki MURAYAMA ◽  
Takahiro IGAWA ◽  
Toshiya NAKAMURA ◽  
Jyo YOKOKAWA ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Strain Sensors ◽  
Deformation Distribution

Damage Identification on the Tilff Bridge by Vibration Monitoring Using Optical Fiber Strain Sensors

2007 ◽  
Vol 133 (2) ◽  
pp. 185-193 ◽  
Author(s):  
Edwin Reynders ◽  
Guido De Roeck ◽  
Pelin Gundes Bakir ◽  
Claude Sauvage
Keyword(s):  
Optical Fiber ◽  
Damage Identification ◽  
Strain Sensors ◽  
Vibration Monitoring
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