NDLI: Thermographic imaging for high-temperature composite materials: a defect detection study

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Thermographic imaging for high-temperature composite materials: a defect detection study

Content Provider	NASA Technical Reports Server (NTRS)
Author	Bishop, Chip Bodis, James R. Roth, Don J.
Copyright Year	1995
Description	The ability of a thermographic imaging technique for detecting flat-bottom hole defects of various diameters and depths was evaluated in four composite systems (two types of ceramic matrix composites, one metal matrix composite, and one polymer matrix composite) of interest as high-temperature structural materials. The holes ranged from 1 to 13 mm in diameter and 0.1 to 2.5 mm in depth in samples approximately 2-3 mm thick. The thermographic imaging system utilized a scanning mirror optical system and infrared (IR) focusing lens in conjunction with a mercury cadmium telluride infrared detector element to obtain high resolution infrared images. High intensity flash lamps located on the same side as the infrared camera were used to heat the samples. After heating, up to 30 images were sequentially acquired at 70-150 msec intervals. Limits of detectability based on depth and diameter of the flat-bottom holes were defined for each composite material. Ultrasonic and radiographic images of the samples were obtained and compared with the thermographic images.
File Size	17738135
Page Count	26
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19950026788
Archival Resource Key	ark:/13960/t53f9pm0b
Language	English
Publisher Date	1995-06-01
Access Restriction	Open
Subject Keyword	Infrared Detectors Nondestructive Tests Surface Defects Optical Scanners Imaging Techniques Infrared Imagery Holes Mechanics Composite Materials Fault Detection Infrared Inspection Flash Lamps Cameras Thermography Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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