Optical fiber strain sensor with extended dynamic range based on specklegrams

Sensors and Actuators A: Physical, Volume 203,  2013, Pages 341-345.

Luis Rodriguez-Cobo, Mauro Lomer, Adolfo Cobo, Jose-Miguel Lopez-Higuera.

Photonics Engineering Group, University of Cantabria, 39005 Santander, Spain.

Abstract

In this paper, a processing scheme based on the morphological similarities of speckle patterns is proposed to extend the dynamic range of Fiber Specklegram Sensors (FSS). The method has been applied to a low cost FSS demonstrating its good performance to extend the dynamic range of strain measurements. The scheme analyzes the pattern energy distribution to establish the current modal state of the FSS and employs the correlation value with the reference modal state specklegram to determine the fine strain measurements. The achieved results exhibit a very high performance, making this low cost technology applicable to structural monitoring.

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