G - Physics – 01 – N
Patent
G - Physics
01
N
340/102
G01N 21/89 (2006.01) G01N 25/72 (2006.01) G06F 15/70 (1985.01)
Patent
CA 1229392
- 20 - ABSTRACT OF THE DISCLOSURE In detecting surface defects of a hot metal body, e.g. hot-rolled steel sheet, by using a first video signal derived from radiation spontaneously radiated from a target area of the hot metal surface and a second video signal derived from external light projected on and reflected from the same target area of the hot metal surface, the rate of false detection by the influence of noise signals attributed to metal oxide present on the hot metal surface is greatly reduced by converting the first and second video signals respectively into first and second binary signals, synchronously feeding the first and second binary signals to an AND circuit and maying a judgment based an the output of the AND circuit. Preferably near-infrared region of the radiation is used in producing the first video signal and visible light as the external light.
470204
Hanafusa Hideyuki
Yamane Hirosato
Futec Incorporated
Kawasaki Steel Corporation
Ridout & Maybee Llp
LandOfFree
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