FIELD: physics.
SUBSTANCE: method of authenticating a polymer film comprises a step of measuring the thickness of a layer inside said film by white light interferometry. The method and devices to carry out the method may be used in security applications, for example to test for counterfeit banknotes.
EFFECT: improved method.
18 cl, 5 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| POLYMERIC FILM AUTHENTIFICATION METHOD | 2012 |
|
RU2535234C2 |
| OPTICAL STORAGE MEDIA AND METHOD OF THEIR PRODUCTION | 2007 |
|
RU2473979C2 |
| LIQUID CRYSTAL DISPLAY | 2008 |
|
RU2444034C1 |
| METHOD FOR MANUFACTURING A PROTECTED ARTICLE, PROTECTED ARTICLE AND METHODS FOR MANUFACTURING MULTIPLE DIFFERENT TYPES OF PROTECTED ARTICLES | 2019 |
|
RU2785049C1 |
| APPARATUS FOR RECORDING CONFIDENTIAL INFORMATION | 2006 |
|
RU2417440C2 |
| PROCESS OF PRODUCTION OF POLYMER PROTECTED PRODUCTS | 2019 |
|
RU2785837C1 |
| METHOD OF MODIFYING CHIRAL LIQUID-CRYSTAL FILMS USING EXTRACTING AGENTS | 2004 |
|
RU2367677C2 |
| ADHESION COPOLYMERS OF ACRYLATE AND OLEFIN, METHODS OF THEIR PRODUCTION AND COMPOSITIONS USING THEM | 2012 |
|
RU2635156C2 |
| LIQUID CRYSTAL DISPLAY | 2010 |
|
RU2450295C1 |
| OPTICAL FILM AND METHOD FOR PRODUCTION THEREOF, ANTIGLARE FILM, POLARISER WITH OPTICAL LAYER AND DISPLAY DEVICE | 2009 |
|
RU2507548C2 |
