| 摘要 |
An apparatus for detecting surface defects particularly in rolled strips, the operation of the apparatus being based on the use of a telecamera with multiple sensitive elements which form parts of respective bright-field and dark-field recording channels. More precisely, the above-mentioned elements are sensitive to light radiations within respective ranges of wavelengths corresponding to those of the radiations emitted by the light sources. The latter are arranged in a manner such that, in one case, the radiation emitted thereby falls substantially tangential on the surface of the strip to be checked and, in the other case, such that the radiation reflected by the said surface is directed towards the telecamera. From a comparison of the images recorded by the recording channels, the comparison being effected by electronic circuit provided in the apparatus, it is possible to derive full information on the state of the surface under examination and hence to apply any necessary modifications to the production cycle.
|
