发明名称 |
MONITORING OF COVERT MARKS |
摘要 |
A method and apparatus for monitoring a body having a reflective surface (1), a coating layer (2) of material transparent to visible light present on the surface (1) and producing a covert optical discontinuity in an imagewise distribution on the layer (2); the imagewise distribution is such that it is visible via polarised light (7) and viewing through a polarised filter (8).
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申请公布号 |
CA2228514(A1) |
申请公布日期 |
1997.02.20 |
申请号 |
CA19962228514 |
申请日期 |
1996.08.05 |
申请人 |
SLS BIOPHILE LIMITED |
发明人 |
HOOD, BARRY ALAN;FARRAR, RICHARD MARK |
分类号 |
G01V8/10;B44B7/00;B44C1/02;(IPC1-7):B44B7/00 |
主分类号 |
G01V8/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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