Changes in speckle patterns induced by load application onto an optical fiber and its detection through image processing

Makoto Hasegawa; Yuta Shimizu; Takuya Nakamaru

doi:10.1117/12.2067587

21 August 2014 Changes in speckle patterns induced by load application onto an optical fiber and its detection through image processing

Makoto Hasegawa, Yuta Shimizu, Takuya Nakamaru

Author Affiliations +

Proceedings Volume 9285, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials for Manufacturing and Testing; 928502 (2014) https://doi.org/10.1117/12.2067587
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

Speckle patterns observed in an output light spot from an optical fiber are likely to be changed due to external disturbances applied to the fiber, and such changes can be utilized for sensing applications. In this paper, certain load was applied onto an optical fiber through which laser beams emitted from a laser diode were propagating, and changes in speckle patterns observed in the output light spot from the optical fiber were investigated as image data via a CCD camera. For the purpose of realizing effective load application onto an optical fiber, a load application section was employed in which several ridges were provided onto opposite flat plates. A jacket-covered communication-grade multi-mode glass optical fiber was placed in the load application section so that corrugated bending of the fiber was intentionally induced via load application due to the ridges. The obtained results from appropriate image processing showed that the number of speckles in the observed patterns decreased upon load application (up to 15kg) onto the optical fiber with satisfactory repeatability. The load was then reduced from the total of 15kg, and the number of speckles was found to recover. With different arrangements of the optical fiber in the load application section in which the number of load application points was altered, slight differences in the observed characteristics were recognized. Thus, there are possibilities of utilizing changes in speckle patterns observed in an output light spot from an optical fiber for sensing of load application onto the optical fiber by employing appropriate load application arrangements.

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Makoto Hasegawa, Yuta Shimizu, and Takuya Nakamaru "Changes in speckle patterns induced by load application onto an optical fiber and its detection through image processing", Proc. SPIE 9285, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials for Manufacturing and Testing, 928502 (21 August 2014); https://doi.org/10.1117/12.2067587

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KEYWORDS

Optical fibers

Speckle pattern

Image processing

Photodetectors

Solar cells

Laser beam propagation

CCD cameras

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