Effectiveness of in situ damage localization methods using sparse ultrasonic sensor arrays

Jennifer E. Michaels

doi:10.1117/12.775788

10 April 2008 Effectiveness of in situ damage localization methods using sparse ultrasonic sensor arrays

Jennifer E. Michaels

Proceedings Volume 6935, Health Monitoring of Structural and Biological Systems 2008; 693510 (2008) https://doi.org/10.1117/12.775788
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

Abstract

Sparse ultrasonic arrays spatially distributed over a large area of a structure have been proposed and tested in the laboratory for in situ detection and localization of damage. Detection algorithms are typically based upon comparison to a baseline, where differences not explained by benign environmental effects are interpreted as damage. Most localization methods are either based upon an arrival time analysis of differenced signals or spatial distribution of a damage index. Triangulation and delay-and-sum type methods fall into the first category and, under ideal conditions, can accurately locate discrete damage such as a single crack. Methods in the second category do not rely on precise timing of scattered signals, but are limited in their ability to precisely locate discrete damage using a small number of sensors. This paper evaluates the effectiveness of both types of methods for locating a single site of discrete damage, and considers the degradation in performance resulting from errors in both wave speed and transducer locations.

Citation Download Citation

Jennifer E. Michaels "Effectiveness of in situ damage localization methods using sparse ultrasonic sensor arrays", Proc. SPIE 6935, Health Monitoring of Structural and Biological Systems 2008, 693510 (10 April 2008); https://doi.org/10.1117/12.775788

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