Thermographic Detection of Starved Joints of Wood

To examine the feasibility of thermographic nondestructive testing of wood adhesive joints, several samples with starved joints, 10-50 mm square, were prepared using wood plates 1.3-3 mm thick of white seraya and urea-formaldehyde resin, and their thermal images were obtained with a thermographic device during heating by incandescent lamps and natural cooling. Surface temperatures were always more in an area of a starved joints than in other parts, and the poor joints were clearly visible in the thermal images.

experimental setup thermal image of sample plate
thermal images of samples after start of heating

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