Point-by-point scanning piezoelectric phased array for detecting damage for SHM

Xingang Li; Zhenqing Wang

doi:10.1117/12.840209

20 October 2009 Point-by-point scanning piezoelectric phased array for detecting damage for SHM

Xingang Li, Zhenqing Wang

Proceedings Volume 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering; 74930D (2009) https://doi.org/10.1117/12.840209
Event: Second International Conference on Smart Materials and Nanotechnology in Engineering, 2009, Weihai, China

Abstract

The aim of the present work is to develop a system of smart devices that could be permanently attached on the surface of the structure for monitoring cracks in most aerospace structures in isolated environments. It is shown that temporal and spatial focusing can be achieved through synthetic time-reversal array method for a linear phase array of sensors and actuators. Numerical simulation verifies the convergence of piezoelectric phased array. Near-field and far-field radiation pattern are also investigated to get the ultrasound field convergence plot. The scanning precision can be adjusted by changing the size of the focus patch. A Piezoelectric phased array system performs a point-by-point scanning in which focusing allows the inspection of large areas. Damage to the structure can be inferred if there is a significant change in the transient response of the structure using the analysis of the amplitude of the received signal. The location of this damaged area can be determined using the analysis of the time it reaches the transducer. By the method of synthesis of received signal time delay from multiple sensors, we can considerably enhance the signal strength, thus reducing the negative effects of noises to solve the tough problem of processing the echo signal. The results suggest accuracy better than 1 mm in finding the location of crack tips.

Citation Download Citation

Xingang Li and Zhenqing Wang "Point-by-point scanning piezoelectric phased array for detecting damage for SHM", Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74930D (20 October 2009); https://doi.org/10.1117/12.840209

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KEYWORDS

Phased arrays

Sensors

Signal detection

Structural health monitoring

Actuators

Signal processing

Control systems

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