Laser scanning thermal probe: A novel approach to NDE

Jacob Kephart, John Chen, Hong Zhang

Research output: Contribution to journalConference article

Abstract

Infrared (IR) thermography and, more recently, thermosonics have proven to be viable means of qualitative nondestructive evaluation (NDE). However, structural defects such as cracks observed through thermosonics can only be identified as "hot spots" indicating a general location of a defect without an accurate depiction of the dimensions or shape of the defect. This paper introduces a new technique dubbed Laser Scanning Thermal Probe, LSTP, which combines thermography with the use of heat application in strategic locations to observe the spatial heat flow patterns. LSTP provides the ability to record heat propagation across a defect area with temperature discontinuities forming due to differences in defect thermal diffusivity, thus providing information which can be used to characterize the defect such as crack length.

Original languageEnglish (US)
Article numberIMECE2004-61161
Pages (from-to)155-159
Number of pages5
JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Volume375
Issue number3
DOIs
StatePublished - Jan 1 2004
Event2004 ASME International Mechanical Engineering Congress and Exposition, IMECE - Anaheim, CA, United States
Duration: Nov 13 2004Nov 19 2004

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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