119 Formation of Sensors by Breaking Optical Fibers in Structural Materials

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This paper describes demonstration of simple fiber optic strain sensors proposed by Asanuma. The concept can be explained as formation of optical interference or loss type sensor in a matrix material by simply breaking a notched or multiply notched optical fiber embedded in it. The notches were made on an optical fiber with an optical fiber cutter and it was embedded in epoxy as a matrix material. When a notched optical fiber embedded epoxy matrix specimen was tensile tested under monitoring of optical transmission loss, fracture of the embedded optical fiber at the notch was clearly observed and then sinusoidal variation of optical power was observed with increasing tensile strain. This result means that an optical interference type strain sensor was successfully formed due to formation of fiber ends parallel to each other and normal to fiber axis by breakage of the optical fiber at the notch. In the case of using multiply notch type optical fiber, the distance of the notches to be able to cause multiple fractures was experimentally obtained as 4mm. Optical loss increase of the embedded optical fiber with increasing tensile strain became clearer with increasing number of optical fiber fractures from 5 to 15. The fractured fiber length could be made as small as 0.5mm by changing from tensile fracture to bending fracture.
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