Smart composite structure based on integrated passive wireless strain sensors

Zi Jing Wong; Chun-Gon Kim

doi:10.1117/12.775825

8 April 2008 Smart composite structure based on integrated passive wireless strain sensors

Zi Jing Wong, Chun-Gon Kim

Proceedings Volume 6932, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008; 69322Q (2008) https://doi.org/10.1117/12.775825
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

Abstract

This paper reports the development of a low-cost inductively coupled passive wireless strain sensor which can be easily embedded within composite prepreg layers for structural health monitoring application. The sensor response shows great linearity, low hysteresis and drift, and sufficient sensing range for wireless interrogation. The sensor sensitivity is found to be relatively low, but with some modifications on the sensor pattern design approximately three-fold increase in sensitivity is obtained. The investigation on both sensor array and sensor directivity verifies its potential to be developed as wireless rosette strain sensor. In addition, mechanical tests are performed. Among the tested mechanical properties, the interlaminar shear strength of composite specimens degrades the most upon sensor embedment. Finally, an analytical model is developed. Its normalized resonant frequency shift due to strain change agrees well with the experimental result.

Citation Download Citation

Zi Jing Wong and Chun-Gon Kim "Smart composite structure based on integrated passive wireless strain sensors", Proc. SPIE 6932, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008, 69322Q (8 April 2008); https://doi.org/10.1117/12.775825

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