DE3474350D1 - Technique for verifying genuineness of authenticating device - Google Patents
Technique for verifying genuineness of authenticating deviceInfo
- Publication number
- DE3474350D1 DE3474350D1 DE8484301659T DE3474350T DE3474350D1 DE 3474350 D1 DE3474350 D1 DE 3474350D1 DE 8484301659 T DE8484301659 T DE 8484301659T DE 3474350 T DE3474350 T DE 3474350T DE 3474350 D1 DE3474350 D1 DE 3474350D1
- Authority
- DE
- Germany
- Prior art keywords
- light
- incidence
- sample
- polychromatic
- reflected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
Abstract
The device operates as a diffractive subtractive colour filter that exhibits a reflectivity spectrum that includes a peak occurring at a wavelength that varies as a linear function of the angle of incidence of polychromatic illuminating light having a particular polarisation. The verification technique involves simultaneously illuminating a sample device over a range of angles of incidence by the polychromatic light, and then employing the reflected light from the sample to illuminate a reference device known to be genuine over the same range of angles of incidence. A sample device is indicated as being genuine only if both the respective intensity ratios of the light reflected from the reference device to the polychromatic light and to the light reflected from the sample device exceed respective threshold values.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP84301659A EP0155414B1 (en) | 1983-09-01 | 1984-03-12 | Technique for verifying genuineness of authenticating device |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3474350D1 true DE3474350D1 (en) | 1988-11-03 |
Family
ID=8192588
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8484301659T Expired DE3474350D1 (en) | 1984-03-12 | 1984-03-12 | Technique for verifying genuineness of authenticating device |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3474350D1 (en) |
-
1984
- 1984-03-12 DE DE8484301659T patent/DE3474350D1/en not_active Expired
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: PAUL SCHERRER INSTITUT WUERENLINGEN UND VILLIGEN, |
|
8328 | Change in the person/name/address of the agent |
Free format text: DR. DIETER V. BEZOLD, DIPL.-ING. PETER SCHUETZ, DIPL.-ING. WOLFGANG HEUSLER, 80333 MUENCHEN |