Radiometric crack detection in fast moving surfaces

Kaufman, Irving; Choudhury, Ashish K.
January 1985
Applied Physics Letters;1/15/1985, Vol. 46 Issue 2, p152
Academic Journal
Cracks in the surfaces of metal shafts rotating up to 3200 rpm were detected by passive, radiometric sensing of the 8–12-μm thermal radiation emitted. This detection is possible because the effective crack emissivity approaches that of a black body, while the metal itself has a much lower emissivity. By the use of signal storage and signal subtraction, the technique is expected to permit ‘‘on-line’’ monitoring of the development of cracks, even in the presence of surface blemishes.


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