Split refracting or split reflecting light received by cellulose-based film comprising surface pattern
AssigneeTeknologian tutkimuskeskus VTT Oy
InventorsTapio Mäkelä, Ari Hokkanen
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Abstract
There is provided detecting modification of optically active cellulose-based film. A method comprises split refracting or split reflecting light received by a surface pattern of an optically active cellulose-based film into a plurality of output light patterns, wherein an output light pattern is determined from the plurality of output light patterns on the basis of a modification applied to the optically active cellulose-based film.
Claims14
An apparatus comprising an optical position sensor device for capturing data and a processor, wherein the processor is configured to:
- control the optical position sensor device to capture data from a cellulose nanofibril (CNF) film, when the CNF film is located in a field of view of the optical position sensor device, the CNF film comprising a surface pattern configured to
- split refract or split reflect light received by the surface pattern into a plurality of output light patterns, wherein an output light pattern is determined from the plurality of output light patterns on the basis of an absorption of water to the CNF film;
- and
- determine the absorption of water to the CNF film on the basis of the captured data indicating a change of one or more output light patterns, in response to the absorption of water of the CNF film.
A method comprising:
- capturing data from a cellulose nanofibril(CNF) film located in a field of view of an optical position sensor device, the CNF film comprising a surface pattern configured to
- split refract or split reflect light received by the surface pattern into a plurality of output light patterns, wherein an output light pattern is determined from the plurality of output light patterns on the basis of an absorption of water to the CNF film;
- and
- determining the absorption of water to the CNF film on the basis of the captured data indicating a change of one or more output light patterns, in response to the absorption of water to the CNF film.
A cellulose nanofibril (CNF) film comprising:
- a surface pattern configured to
- split refract or split reflect light received by the surface pattern into a plurality of output light patterns, wherein an output light pattern is determined from the plurality of output light patterns on the basis of an absorption of water to the CNF film.
A method comprising:
- split refracting or split reflecting light received by a surface pattern of a cellulose nanofibril (CNF) film into a plurality of output light patterns, wherein an output light pattern is determined from the plurality of output light patterns on the basis of an absorption of water to the CNF film.
A non-transitory computer readable medium comprising computer readable program code means adapted to perform at least the following:
- capturing at least one image or a video from a cellulose nanofibril (CNF) film located in a field of view of an optical position sensor device, the CNF film comprising a surface pattern configured to
- split refract or split reflecting light received by the surface pattern into a plurality of output light patterns, wherein an output light pattern is determined from the plurality of output light patterns on the basis of an absorption of water to the CNF film;
- and
- determining the absorption of water to the CNF film on the basis the captured data indicating a change of one or more output light patterns, in response to the absorption of water to the CNF film.
Dependencies are inferred from the claim text.