Agfa-Gevaert Ag

Manfred Faust

Hans-Joachim Schumann

Gunter Junkers

Gunter Metz

Werner Lessnig

Willi Spiegel

The invention relates to a process for luminescence-spectroscopic examination and determination of coatings and coating profiles of solid and liquid layers and layer assembles whereby the luminescent substances present in the layers are photoselectively probed and determined through emission product spectra in incident and/or transmitted light by a photon detector using an emission spectroscopic process and whereby the photoselectivity of the luminescence-spectroscopic process being based on the substance related choice of the difference in wavelength .DELTA. .lambda. between the emission wavelength .lambda..sub.e and the excitation wavelength .lambda..sub.a.

Process for the luminescense-spectroscopic examination of coatings and

An apparatus for automatically determining the surface tension by the stalagmometer principle using a pipette containing a test volume, having a drop face at its lower end and is provided with three light barriers. The three light barriers are connected to an evaluation circuit which counts the number of whole drops and also determines the fractions of whole drops pertaining to the test volume.

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Bergisch Gladbach, Germany

Manfred Faust