Opitcal fiber sensor systems for simultaneous monitoring of strain and damage in smart composites

Hyung Joon Bang; Dae-Hyun Kim; Hyun Kyu Kang; Chang Sun Hong; Chun Gon Kim

doi:10.1117/12.484239

22 July 2003 Opitcal fiber sensor systems for simultaneous monitoring of strain and damage in smart composites

Hyung Joon Bang, Dae-Hyun Kim, Hyun Kyu Kang, Chang Sun Hong, Chun Gon Kim

Proceedings Volume 5050, Smart Structures and Materials 2003: Smart Sensor Technology and Measurement Systems; (2003) https://doi.org/10.1117/12.484239
Event: Smart Structures and Materials, 2003, San Diego, California, United States

Abstract

To perform the real-time health monitoring of the smart composite structures, two fiber optic sensor systems are proposed, that can measure the strain and detect the moment of fracture simultaneously. The types of the coherent sources used for fracture signal detection classify the systems--EDFA with FBG and EDFA with Fabry-Perot filter, and these systems were applied to extrinsic Fabry-Perot interferometer sensors imbedded in composite specimens to monitor the tensile tests. To understand the characteristics of matrix cracking signals, at first, we performed tensile tests using surface attached PZT sensors. This paper describes the implementation of time-frequency analysis such as short time Fourier-transform for the quantitative evaluation of the fracture signals like matrix cracking. From the test of tensile load monitoring using optical fiber sensor systems, measured strain agreed with the value of electric strain gage and the fracture detection system could detect the moment of damage with high sensitivity to recognize the onset of micro-crack fracture signals.

Citation Download Citation

Hyung Joon Bang, Dae-Hyun Kim, Hyun Kyu Kang, Chang Sun Hong, and Chun Gon Kim "Opitcal fiber sensor systems for simultaneous monitoring of strain and damage in smart composites", Proc. SPIE 5050, Smart Structures and Materials 2003: Smart Sensor Technology and Measurement Systems, (22 July 2003); https://doi.org/10.1117/12.484239

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KEYWORDS

Signal detection

Sensors

Composites

Fiber optics sensors

Fiber Bragg gratings

Electronic filtering

Filtering (signal processing)

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