Fiber optic sensor protection system and its practical for structural integrity monitoring of concrete structures

2005 ◽  
Author(s):  
J. S. Leng ◽  
R. A. Barnes ◽  
A. Hameed ◽  
D. Winter ◽  
J. Tetlow ◽  
...  
Keyword(s):  
Structural Integrity ◽  
Fiber Optic ◽  
Concrete Structures ◽  
Protection System ◽  
Fiber Optic Sensor ◽  
Integrity Monitoring ◽  
Optic Sensor

scholarly journals Measurement of Microvibration by Using Dual-Cavity Fiber Fabry-Perot Interferometer for Structural Health Monitoring

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Dae-Hyun Kim ◽  
Jin-Hyuk Lee ◽  
Byung-Jun Ahn
Keyword(s):  
Phase Difference ◽  
Initial Phase ◽  
Structural Integrity ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Experimental Result ◽  
Optic Sensor ◽  
Initial Phase Difference ◽  
Fabry Perot ◽  
Micro Vibration

Extensive researches have recently been performed to study structural integrity using structural vibration data measured by in-structure sensors. A fiber optic sensor is one of candidates for the in-structure sensors because it is low in cost, light in weight, small in size, resistant to EM interference, long in service life, and so forth. Especially, an interferometric fiber optic sensor is very useful to measure vibrations with high resolution and accuracy. In this paper, a dual-cavity fiber Fabry-Perot interferometer was proposed with a phase-compensating algorithm for measuring micro-vibration. The interferometer has structurally two arbitrary cavities; therefore the initial phase difference between two sinusoidal signals induced from the interferometer was also arbitrary. In order to do signal processing including an arc-tangent method, a random value of the initial phase difference is automatically adjusted to the exact 90 degrees in the phase-compensating algorithm part. For the verification of the performance of the interferometer, a simple vibration-test was performed to measure micro-vibration caused by piezoelectric transducer (PZT). As an experimental result, the interferometer attached on the PZT successfully measured the 50 Hz-vibration of which the absolute displacement oscillated between −424 nm and +424 nm.

The Development and the Use of Fiber Optic Sensors for the Structural Health Monitoring of Composite (GFRP) Structures

2002 ◽  
Author(s):  
Evageline Rivera ◽  
Dimos Polyzois ◽  
Douglas J. Thomson ◽  
Ningguang Xu
Keyword(s):  
Structural Integrity ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Fiber Optic Sensor ◽  
Sensor Technology ◽  
Promising Alternative ◽  
Interferometric Sensors ◽  
Optic Sensor ◽  
Composite Glass ◽  
Path Lengths

The development of a fiber optic sensor system for the long-term monitoring of composite glass fiber-reinforced polymer (GFRP) poles will be presented. There is a growing interest in developing techniques for evaluating and monitoring their structural integrity. In the past few years, fiber optic sensor technology has emerged as a promising alternative to conventional methods of monitoring such as strain gauges. Fiber optic sensors can be attached to or embedded in civil structures such as bridges, dams and buildings. They operate by responding to changes in temperature and strain on the structure. The long gauge fiber optic sensor measures the average strain between two points on a structure. Long gauges are interferometric sensors that involve phase matching two optical paths to create a maximum interference pattern at the photodetector. The strain is calculated using the distance in which the reference arm of the interferometer is moved in order to match the optical path lengths.

scholarly journals New fiber optic sensor for monitoring temperatures in concrete structures during fires

2017 ◽  
Vol 254 ◽  
pp. 116-125 ◽  
Author(s):  
B. Torres Górriz ◽  
I. Payá-Zaforteza ◽  
P.A. Calderón García ◽  
S. Sales Maicas
Keyword(s):  
Fiber Optic ◽  
Concrete Structures ◽  
Fiber Optic Sensor ◽  
Optic Sensor

Pedestrian protection system, featuring fiber optic sensor

ATZ worldwide ◽  
2005 ◽  
Vol 107 (3) ◽  
pp. 15-19 ◽  
Author(s):  
Mathias Miedreich ◽  
Herbert Schober
Keyword(s):  
Fiber Optic ◽  
Protection System ◽  
Fiber Optic Sensor ◽  
Pedestrian Protection ◽  
Optic Sensor
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