A POF-based distributed strain sensor with intrinsic memory effect

Takuji Fukumoto; Kentaro Nakamura; Sadayuki Ueha

doi:10.1117/12.733938

12 October 2007 A POF-based distributed strain sensor with intrinsic memory effect

Takuji Fukumoto, Kentaro Nakamura, Sadayuki Ueha

Proceedings Volume 6770, Fiber Optic Sensors and Applications V; 67700P (2007) https://doi.org/10.1117/12.733938
Event: Optics East, 2007, Boston, MA, United States

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.

Citation Download Citation

Takuji Fukumoto, Kentaro Nakamura, and Sadayuki Ueha "A POF-based distributed strain sensor with intrinsic memory effect", Proc. SPIE 6770, Fiber Optic Sensors and Applications V, 67700P (12 October 2007); https://doi.org/10.1117/12.733938

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