Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Harald Beese

Wulf Graehlert

Stefan Kaskel

Volkmar Hopfe

Wulf Grählert

Gerrit Mäder

Johannes Grübler

Eckehard Hofmüller

A method and an apparatus for determining the permeation rate of barrier materials, with which in a measuring chamber () which has at least two shut-off elements () for opening and closing, a concentration of at least one permeate is determined which, present as a test gas with a constant concentration in a test gas chamber (), is permeated into the measuring chamber () through a barrier element () which is arranged between the test gas chamber () and the measuring chamber () and which has a known permeable surface (A). In this respect, the permeation rate is calculated using an enriching time (tA) and using a purge time (tS) determined using a first measurement variant in a process step (i) and the course of the permeate concentration (c) determined during the purge time (tS) or using a course of the permeate concentration (c) determined using a second measurement variant in a process step (i) during a predefinable purge time (tvS) and using the predefinable purge time (tvS) and a predefinable enriching time (tvA) using an equation.

Method and apparatus for determining the permeation rate of barrier materials

The invention relates to a method and a device for determining the permeation rate of barrier elements and ultra-barrier elements according to an isostatic permeation measurement method. In the process, the convective mass transfer of a permeate permeated through a barrier element is replaced by a diffusion-controlled mass transfer along a diffusion path in a subsequently arranged measurement chamber with a hollow conducting element and permeate sink. The permeate sink ensures that permeate is removed continuously, and so a mass flux equilibrium of the permeate is set through the barrier element and through the diffusion path. The concentration gradient of the permeate and, from this, the permeation rate of the barrier element is then determined by non-invasive determination of the concentration of the permeate along the diffusion path.

Device and method for determining the permeation rate of barrier elements and ultra-barrier elements

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Freital, Germany

Harald Beese