发明名称 |
APPARAT FOR DETEKTERING AV YTDEFEKTER HOS LANGSTRECKTA METALLELEMENT |
摘要 |
Apparatus for detecting surface defects in steel billets comprises an h.f. energized eddy current probe for scanning over the surface of the billet and a dual channel receiver responsive to signals from this probe dependent on (a) any surface defects, and (b) the probe surface spacing, in a manner such that in one channel a predominant factor in the signal waveform is characteristic of (a) while in the other channel a predominant factor in the signal is characteristic of (b). The signals from the two channels are combined in a summing amplifier and a difference amplifier whereby the outputs therefrom are conditioned to be exclusively characteristic of (a) and (b) respectively. |
申请公布号 |
SE403188(B) |
申请公布日期 |
1978.07.31 |
申请号 |
SE19750007332 |
申请日期 |
1975.06.26 |
申请人 |
* BRITISH STEEL CORPORATION |
发明人 |
D H * SAVIDGE;E * WADSWORTH |
分类号 |
G01N27/90;(IPC1-7):01B7/34;01N27/86 |
主分类号 |
G01N27/90 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|