Abstract
In this paper, we present our progress on developing Sonic Infrared (IR) Imaging for structural health monitoring on steel structures. Sonic IR imaging is a fast, wide-area novel imaging NDE/SHM technique. Ultrasonic excitation was used to stimulate heating in defects, combining with Infrared Imaging to identify defects in structures. The whole process takes only about a second. We have been working on some steel specimens used in some typical steel structures. Actual heating patterns are extracted from the IR images and the actual temperature changes are mapped out. Theoretical computing is also carried out to calculate the heating pattern in the specimens with the experimental results as benchmarks.
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