Method for measuring a permeation rate, a test and an apparatus for measuring and testing
AssigneeKoninklijke Philips Electronics N.V.
InventorsPetrus Cornelis Paulus Bouten, Giovanni Nisato, Peter Jan Slikkerveer, Henricus Franciscus Johannus Jacobus Van Tongeren, Eliav Itzhak Haskal, Paul Van Der Sluis
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Abstract
A method is proposed for measuring water permeability of substrates (1). A reactive compound (Ca, Ba) which reacts with a diffusing material, e.g. water, is applied on the substrate and the change in time of transmissivity, reflectivity of the layer is monitored in time.
Claims23
A method for measuring the permeation rate of a substrate comprising the steps of
- a) applying a layer of a reactive material to a first side of the substrate in an substantially inert atmosphere
- b) positioning said first side of the substrate within a substantially hermetically sealed environment
- c) exposing the other side of the substrate to an environment containing compounds which react with the reactive material and
- d) comparing the light reflectivity or the light absorption of the layer of reactive material with a calibration value.
A method for measuring the permeation rate of a substrate comprising the steps of
- a) positioning a substrate within a substantially hermetically sealed environment
- b) applying reactive material to a first side of the substrate in an substantially inert atmosphere
- c) exposing the other side of the substrate to an environment containing compounds which react with the reactive material and
- d) comparing the light reflectivity or the light absorption of the layer of reactive material with a calibration value.
17 An apparatus according to claim 15 in which at least two sub-apparatuses have been combined
21 An apparatus according to claim 15 in which the means for comparing the light reflectivity or the light absorption with a calibration value comprise means for obtaining a reflectionspectrum or an absorption spectrum.
A method for measuring the permeation rate of an encapsulation comprising the steps of
- a) applying a layer of a reactive material to a first side of a substrate or to the encapsulation
- b) fixing said encapsulation to the first side of the substrate in a substantially hermetically sealed way
- c) exposing the assembly to an environment containing compounds which react with the reactive material and
- d) comparing the light reflectivity or the light absorption of the layer of reactive material with a calibration value.
Dependencies are inferred from the claim text.