The UV tester (UV = ultraviolet radiation ) is used to analyze photoluminescence .
Differentiation based on luminescence
Luminescences can be found on banknotes , postage stamps , as well as documents and ID cards (ID card, passport, driver's license). These are used for automation as well as protection against counterfeiting . A distinction is made between this type of luminescence using special UV testing devices
- The fluorescence is excited with long-wave UVA light (~ 366 nm wavelength).
- The phosphorescence is excited with short-wave UVC light (~ 254 nm wavelength), which glows after the excitation.
A UV tester is used as a test device in philately to detect
- " Counterfeits to the detriment of collectors " (repair work on philatelic material)
- " Counterfeiting to the detriment of the post office " (different types of fluorescence attempts at forgery)
- different output variants and optical brighteners and
- destroyed fluorescences by plasticizers .
- Matthias van Heek: Review of monetary means of payment , Grin Verlag, 2010, ISBN 3640766563
- ↑ http://www.gamesundbusiness.de/markt/produkte/details/inkiess-banksicherheit-pruefer-uv-22-3974/ ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.