Detection of near surface defects by reversed thermography

Details Detection of near surface defects by reversed thermography Detection of near surface defects by reversed thermography

G - Physics

01

N

G01N 25/72 (2006.01) G01N 21/88 (2006.01) G01N 25/20 (2006.01)

Patent

CA 2267586

Disclosed is a method for the detection of near surface defects in components, such as engine block cylinder walls. In a first step, a flow of cold air is applied to an area to be inspected, thereby establishing a heat flow from the inside-out. In a second step, the cooled area is subjected to an inspection by reversed thermography in order to locate any cold spots which would be indicative of defects. The amount of heat extracted by the cold air is a function of the difference in temperature between the air and the surface. In steady-state conditions, that temperature reaches an equilibrium where the cooling rate equals the amount of heat continuously flowing from the hot mass underneath the cooler surface. Where there is a bonding defect, the equilibrium temperature will be lower because heat flow towards the surface is disrupted. Therefore, defects appear as cold spots, in reversed contrast with traditional thermography.

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