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

Florian Gruber

Wulf Graehlert

Philipp Wollmann

Wulf Grählert

In the arrangement for determining the achievable adhesive strength before forming a connection having material continuity to a surface of a joining partner, a plurality of detectors are present and arranged that are configured for a spatially resolved spectral analysis of electromagnetic radiation within a wavelength interval and are connected to an electronic evaluation unit. They can detect radiation emitted from a broadband radiation source of a reflection incident on the surface of one of the joining partners, and/or after passing through joining partners transparent for the electromagnetic radiation on the detectors. A laterally and temporally homogeneous intensity of the electromagnetic radiation should be observed in this respect. The joining partner is formed from a material that does not 100% absorb the respective electromagnetic radiation and thus a transmission and/or reflection is possible. The electronic evaluation unit is configured such that the measured signals of the detectors detected with spatial resolution and wavelength resolution can be detected within a wavelength interval for individual local points that are arranged on a predefinable surface and measured signals detected at a plurality of positions can be associated with a respective part region of the detected surface (hypercube). A data reduction can be carried out for all measurement signals of the part regions. A statement on a corresponding adhesive strength is achievable using these selected features with a regression model stored in the memory.

Arrangement for determining the achievable adhesive strength before forming a connection having material continuity to a surface of a joining partner

The invention relates to an assembly for determining the permeation rate of a sample for at least one permeate, in particular water vapor, wherein multiple detectors are arranged in a row or in a row and column arrangement for the spatially resolved spectral analysis of electromagnetic radiation within a wavelength interval. The detectors are connected to an electronic evaluation unit and are arranged such that electromagnetic radiation emitted from a broadband radiation source is incident on the detectors either after being reflected by the surface of the sample, by a layer formed on the sample, or by the surface of a layer within the sample, and/or after passing through a sample which is transparent to the electromagnetic radiation. The irradiation is carried out such that a homogeneous intensity of the electromagnetic radiation is maintained on a surface, by means of which the electromagnetic radiation is reflected or through which the radiation is transmitted. The electronic evaluation unit is designed such that the detector measurement signals detected in a spatially- and wavelength-resolved manner can be detected within a wavelength interval for individual location points which are arranged on a specifiable surface of the sample. Each of the measurement signals detected at multiple positions are assigned to a sub-region of the detected surface (hypercube), and a data reduction process is carried out for all of the detected surface sub-region measurement signals which are detected in a wavelength-resolved manner, wherein informative features are selected and can be used together with a previously ascertained regression model, which is stored in an electronic storage device, in order to draw a conclusion regarding a corresponding permeation rate, said regression model being generated using the feature sets, which are obtained analogously, of samples with permeation rates which have been ascertained using another measurement method with a higher degree of measurement precision.

Assembly for determining the permeation rate of a sample

An arrangement for determining characteristics or parameters of a sample, or a layer formed on or in the sample, has detectors, spatially resolving spectral analysis of electromagnetic radiation within a wavelength interval, provided in rows or in a row and column arrangement, whereby electromagnetic radiation emitted from a broadband radiation source is incident on the detectors after reflecting off, and/or passing through, the sample, or layer formed on or in the sample, upon which is observed a homogeneous intensity of the electromagnetic radiation, and an electronic evaluation unit connected to the detectors compares the spatially-resolved and wavelength-resolved signals detected by the detectors with a theoretical wavelength dependent progression of the respective radiation intensities obtained through simulation or with a progression obtained by calibration on a known sample, in order to obtain information for the measurement position detected, and determine the spatially-resolved distribution of the characteristics or parameters.

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Dresden, Germany

Florian Gruber