Method and apparatus for testing a flat, reflecting surface...

Details Method and apparatus for testing a flat, reflecting surface... Method and apparatus for testing a flat, reflecting surface...

G - Physics

01

N

340/123.4

G01N 21/01 (2006.01) G01N 21/89 (2006.01)

Patent

CA 1076679

ABSTRACT OF THE DISCLOSURE The reflecting surface of an object to be tested for imperfections is scanned by the light beam of a laser, and the specularly reflected portion of the beam is converted to dif- fuse light by a sheet of translucent material before it im- pinges on a photo-multiplier tube. The output signal of the tube gives an indication of surface defects. When pinholes may be disregarded, but hairline cracks of equal width are ob- jectionable, the scanning beam is passed through a diverging cylinder lens to give it an elongated cross section.

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