| |
A
Portugese visa under longwave UV showing fluorescent features |
|
Examining
UV activated security features
Special features which are invisible to the eye but which fluoresce
brightly under ultraviolet light are often printed on or incorporated
into security documents to deter counterfeiting. Both the VSC 6000
and VSC4PLUS provide a range of UV lamps to examine these
features. In addition to visual examination, fluorescence spectra and
colour co-ordinate measurements can be made on samples as small
as 50 microns square.
The VSC 6000 and VSC4PLUS feature the following UV sources:
- long wave incident UV, 365nm peak wavelength
- medium wave incident UV, 313nm peak wavelength
- short wave incident UV, 254nm peak wavelength
- long wave transmitted UV, 365nm peak wavelength
Back |
