G - Physics – 01 – N
Patent
G - Physics
01
N
350/32, 340/123.
G01N 25/72 (2006.01)
Patent
CA 1297550
TITLE DEVICE FOR SUBSURFACE FLAW DETECTION IN REFLECTIVE MATERIALS BY THERMAL-TRANSFER IMAGING INVENTORS PAOLO G. CIELO XAVIER MALDAGUE JEAN C. KRAPEZ ABSTRACT OF DISCLOSURE Apparatus for nondestructive detection of subsurface defects in a continuously moving workpiece of sheet material by using an infrared thermal imager. The temperature of a portion of the surface of sheet material is altered and the presence of subsurface flaws is in- dicated by development of discontinuities in the surface temperature distribution above the defects. In order to avoid problems due to changes in the infrared emis- sivity of the surface of sheet material, such as caused by grease patches or oxidized areas as well as errors caused by reflections of other sources of infrared radiation from the surface, the thermal image of the portion is first transferred by contact to a surface of a thermal transfer device whose surface has a high infrared emissivity and a low infrared reflectivity. Then the thermal image of the portion is obtained from the surface of the thermal transfer device.
577288
Cielo Paolo G.
Krapez Jean C.
Maldague Xavier
As Represented By The Nationa L. Research Council Of Canada/cons Her Majesty The Queen In Right Of Canada
Canadian Patents And Development Limited/societe Canadienne Des
Cielo Paolo G.
Krapez Jean C.
Thomson Alan A.
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