Theoretical Modeling of Signal Loss versus Crack Opening for a Novel Crack Sensor
Publication: Journal of Engineering Mechanics
Volume 131, Issue 8
Abstract
The degradation of concrete structures is always accompanied by the formation of cracks. Crack monitoring is hence useful in assessing the “health condition” of the structure. In our previous investigation on an optical-fiber crack sensor, we have successfully demonstrated the possibility of crack detection and monitoring without requiring prior knowledge of crack locations. Also, a single fiber can be employed to monitor a number of cracks. In practical applications, the signal loss versus crack opening relationship of the sensor needs to be properly “designed” to satisfy performance requirements on sensitivity to small cracks and/or the total number of detectable cracks (which is limited by the maximum loss at each crack). In this paper, a theoretical model for the signal loss versus crack opening relationship is developed through a combination of mechanical and optical analyses. Using concrete beams with embedded sensors, crack monitoring experiments are conducted. Test results are found to be in reasonably good agreement with predictions from the model. With the verified model, simulations are carried out to study the effect of various parameters on sensor performance. The potential application of the theoretical model to generate sensor design guidelines is hence demonstrated.
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Acknowledgements
The work described in this paper was fully supported by a grant from the Research Grant Council of the Hong Kong Special Administrative Region, China (Project No. HKUST6204/98E).
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 131 • Issue 8 • August 2005
Pages: 777 - 790
Copyright
© 2005 ASCE.
History
Received: Nov 14, 2003
Accepted: Jan 6, 2005
Published online: Aug 1, 2005
Published in print: Aug 2005
Notes
Note. Associate Editor: Eric N. Landis
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