Published in Review of Progress in QNDE: Golden, CO, July 1, 2004, pages 1608-1615.
Copyright © 2004 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Review of Progress in QNDE and may be found at http://dx.doi.org/10.1063/1.1916862.
NOTE: At the time of publication, the author John Chen was not yet affiliated with Cal Poly.
Structural defects such as cracks have recently been identifiable through a new nondestructive evaluation (NDE) technique know as sonic IR or thermosonics. However, these defects are depicted through thermal imagining system as localized "hot spots" indicating a general location of a defect without an accurate portrayal of the dimensions or shape of the defect. This paper demonstrates a new technique called Laser Scanning Thermal Probe, LSTP, which utilizes thermography with the use of heat application in strategic locations to observe spatial heat flow patterns. The LSTP records heat propagation across a defect area previously identified through the thermosonic technique. Thermal gradients will occur as heat traverses the crack and provide information to characterize the crack such as its length and shape.