Journal of Intelligent Material Systems and Structures

 

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This version was published on April 1, 2008
Journal of Intelligent Material Systems and Structures, Vol. 19, No. 4, 497-507 (2008)
DOI: 10.1177/1045389X07076669

3*3 Coupler-Based Mach-Zehnder Interferometer and Its Application in the Delamination Detection in FRP Composite

Yi Jiang

Department of Opto-Electronics, School of Information science and technology, Beijing Institute of Technology, Beijing 100081, bitjy{at}bit.edu.cn

Ying Xu

ShenZhen Institute of Building Research, Fu Tian district, Shen Zhen, Guang Dong, China

Christopher K.Y. Leung

Department of Civil Engineering, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong

This article focuses on the development and application of a 3 * 3 coupler-based Mach-Zehnder interferometer. The software for signal demodulation is developed. Based on waveforms obtained at intermediate steps, plausible errors are analyzed and found to be small. The interferometer is then applied to the delamination detection in fiber-reinforced polymer (FRP) composites. Test results indicate the feasibility of detecting both the size and location of delamination by applying quasi-impulse loadings.

Key Words: Mach-Zehnder interferometer • 3 * 3 coupler • delamination • FRP composite.


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