Correlation-based continuous-wave techniques for fiber optic distributed sensing with a high spatial resolution

2002 ◽  
Author(s):  
Kazuo Hotate
Keyword(s):  
Spatial Resolution ◽  
Fiber Optic ◽  
Continuous Wave ◽  
High Spatial Resolution ◽  
Distributed Sensing

High Spatial Resolution Crack Monitoring in Concrete Structures Using a Distributed Fiber Optic Sensor

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Kevin (Wenhai) Li ◽  
Michel Gaudet
Keyword(s):  
Spatial Resolution ◽  
Fiber Optic ◽  
High Spatial Resolution ◽  
Early Stage ◽  
Large Strain ◽  
Fiber Optic Sensor ◽  
Crack Location ◽  
Four Point Bending ◽  
Optic Sensor ◽  
Distributed Fiber Optic Sensor

Abstract A method to monitor the mechanical behavior and identify crack location and growth in a concrete structure element using a distributed fiber optic sensor (FOS) system is demonstrated experimentally by testing concrete specimens in four-point bending. The sensor system consisted of an optical frequency domain reflectometry (OFDR) interrogator unit paired with an all-grating sensing fiber that was bonded to the surface of the concrete test specimen. Strain measurements with high spatial resolution of <10 mm were obtained at various points along a single fiber cable. Large strain values at the crack locations indicated strain concentrations that could be used to assess the crack growth. The distributed sensing system demonstrated the capability to detect localized, early stage cracks, with crack width smaller than 0.1 mm, well before they become observable by visual inspection.

scholarly journals Crack Detection Using Fiber Optic Distributed Sensor with High Spatial Resolution

2003 ◽  
Vol 41 (7) ◽  
pp. 29-33
Author(s):  
H. Kumagai ◽  
H. Iwaki ◽  
Sean Soon Leng Ong ◽  
K. Hotate
Keyword(s):  
Spatial Resolution ◽  
Crack Detection ◽  
Fiber Optic ◽  
High Spatial Resolution ◽  
Distributed Sensor
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