| 摘要 |
PURPOSE:To provide a flaw detector and a noise removing method therefor in which noise is removed positively when a continuously fed band metal is subjected to on-line flaw detection in or on the surface thereof and SN ratio can be enhanced. CONSTITUTION:Output signals from adjacent detection elements 1, amplified by amplifiers 2, are added to each other by adders 3 and the sum is fed to an adder/substractor 4 where the sum of output signals from two detection elements 1 at the both adjacent sides to the aforementioned detection element 1 is subtracted from the aforementioned sum thus offsetting the correlated noise components or removing them by convergence. At the same time, the level of the signal component is increased and the signal component is passed through a filter and a rectifier 7 to produce a steady state inspection signal which is employed, together with a non-steady state inspection signal, by a flaw detector in the detection of the presence and the position of a flaw. |
