Indicator
AssigneeTeknologian tutkimuskeskus VTT Oy
InventorsEero Hurme, Then Sipiläinen-Malm
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Abstract
The invention relates to an indicator comprising a substrate and an optical grating structure fabricated on the substrate, the grating structure being formed from an indicator material comprising a binder and deliquescent salt and varying in volume by the effect of moisture. Further, the invention relates to a method for fabricating an indicator wherein a substrate is coated by an indicator material forming an optical grating structure, and the optical grating structure is fabricated onto the substrate, and use of an indicator for detecting quality and/or authenticity. Furthermore, the invention relates to a package and a method for detecting a change induced by moisture without breaking the package.
Claims17
An indicator comprising:
- a substrate and
- an optical grating structure fabricated on the substrate, the grating structure being formed from indicator material comprising a binder and deliquescent salt and varying in volume by the effect of moisture.
A method for fabricating an indicator, the method comprising the steps of:
- coating a substrate with an indicator material forming an optical grating structure and containing a binder and deliquescent salt and varying in volume by the effect of moisture;
- fabricating the optical grating structure on the substrate coated with the indicator material forming a grating structure.
Dependencies are inferred from the claim text.