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Proceedings Paper

A POF-based distributed strain sensor with intrinsic memory effect
Author(s): Takuji Fukumoto; Kentaro Nakamura; Sadayuki Ueha
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Paper Abstract

The authors have been investigating the sensing characteristics of plastic optical fiber (POF) using the optical time-domain reflectometry (OTDR) for various kinds of mechanical disturbances such as bending, clamping, twisting and stretching as well as the effects induced by temperature rise. In this report, methods to fix the POF cable to wooden structures and their performances to detect the deformations are examined. The dimensions of the fixing plate are changed to minimize the undesirable effect of the fixing on the OTDR responses. Life of the memory effect also discussed through experiments. We can detect strain applied to the POF after the event is over through the memory effect of POF, which is caused by the plastic deformation. Our experiments show that the life of memory is over one month after the external force is released. Spatial resolution along the POF is found to be 5 m, and 5-point detection experiments are carried out using a 100-m POF. We discuss the memory effect in the case of multipoint measurements. Three types of POF cables are compared in terms of the reflection and loss at the deformed point.

Paper Details

Date Published: 12 October 2007
PDF: 10 pages
Proc. SPIE 6770, Fiber Optic Sensors and Applications V, 67700P (12 October 2007); doi: 10.1117/12.733938
Show Author Affiliations
Takuji Fukumoto, Tokyo Institute of Technology (Japan)
Kentaro Nakamura, Tokyo Institute of Technology (Japan)
Sadayuki Ueha, Tokyo Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 6770:
Fiber Optic Sensors and Applications V
Eric Udd, Editor(s)

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