An experimental study on detection of load application onto an optical fiber by means of changes of a speckle pattern

Makoto Hasegawa; Muneki Kawahara

doi:10.1117/12.979383

30 November 2012 An experimental study on detection of load application onto an optical fiber by means of changes of a speckle pattern

Makoto Hasegawa, Muneki Kawahara

Author Affiliations +

Proceedings Volume 8561, Advanced Sensor Systems and Applications V; 856103 (2012) https://doi.org/10.1117/12.979383
Event: Photonics Asia, 2012, Beijing, China

Abstract

For the purpose of investigating possibilities of utilizing changes of speckle patterns, to be observed in an output light spot from an optical fiber, due to external disturbance for sensing application, a certain load was applied onto an optical fiber through which laser beams emitted from a laser diode were propagating, and the resultant changes in the speckle patterns were observed. The obtained results showed that when the load was applied onto the optical fiber via a flat plate placed over the fiber, no significant changes were recognized in the speckle pattern. However, in the case where the optical fiber was placed so that corrugated bending of the fiber was induced by the load application via ridges, the number of speckles in the pattern decreased upon load application. Influences of a contact area size between the ridges and the optical fiber were also confirmed by employing several different arrangements for the load application. From these results, it was confirmed that observation of speckle patterns in an output light spot from an optical fiber can be utilized to realize sensing of load application onto the optical fiber by employing arrangements with ridges of suitable dimensions alternately disposed against the optical fiber to enhance effects of load application.

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Makoto Hasegawa and Muneki Kawahara "An experimental study on detection of load application onto an optical fiber by means of changes of a speckle pattern", Proc. SPIE 8561, Advanced Sensor Systems and Applications V, 856103 (30 November 2012); https://doi.org/10.1117/12.979383

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