Abstract: The invention relates to a device for measuring light-activated fluorescence of at least one coating that contains a fluorescent material, and its use for measuring fluid materials which cause fluorescence-quenching in at least one of the fluorescent coatings. To activate the fluorescence, at least one first light wave-guide is directed onto at least one coating applied to a support and the fluorescent light is directed at a detector by means of at least one-second light wave-guide, in order to determine the intensity of the fluorescent light. The end faces of the different fluorescent light wave guides are then arranged to have overlapping entry and/or exit cones and/or be of a shape substantially identical to the at least one coating containing a fluorescent material, in such a way that an accurate measurement of the fluorescence intensity can be attained, and that the light source(s), light wave guides and the detector(s) are lodged in a measuring head.

Abstract: The invention relates to a device and a method for optically measuring the concentrations of a substance contained in a fluid medium. With the solution according to the invention the accuracy of measurement is to be increased in accordance with the object over a greater period without any additional calibration measurements, and ageing of a fluorescent substance within a layer is to be taken into consideration, in particular, and the long-time drift of such a measurement system is to be reduced. To achieve this, a layer containing such a known fluorescent substance or layer system are employed in which fluorescence is excited. The fluorescence changes depending on a substance concentration or a pH-value, and the intensity varying correspondingly in time or phase shift of the fluorescent light is allowed to be measured with at least one optical detector with the known intensity or phase of the fluorescence exciting light.

Abstract: The invention relates to a device and a method for optically measuring the concentrations of a substance contained in a fluid medium. With the solution according to the invention the accuracy of measurement is to be increased in accordance with the object over a greater period without any additional calibration measurements, and ageing of a fluorescent substance within a layer is to be taken into consideration, in particular, and the long-time drift of such a measurement system is to be reduced. To achieve this, a layer containing such a known fluorescent substance or layer system are employed in which fluorescence is excited. The fluorescence changes depending on a substance concentration or a pH-value, and the intensity varying correspondingly in time or phase shift of the fluorescent light is allowed to be measured with at least one optical detector with the known intensity or phase of the fluorescence exciting light.

Abstract: Method of manufacturing a sensitive single-layer system for optically detecting a concentration of an analyte, such as, for example, oxygen, the analyte being capable of investigation in liquid or gaseous aggregate condition or in a dissolved condition, by adsorption, luminescence or luminescence quenching of an indicator sensitive to the analyte, which is preferably permanently immobilized in the optical beam path. The sensitive single-layer system achieves a reproducible and extremely short response behavior. Indicators are adsorbed on a filler material and thereafter a mixture is produced with a matrix material permeable to the analyte to be detected. Then, under the action of pressure, the mixture is extruded onto a substrate, the layer thickness being formed in dependence on the applied pressure used. The applied sensitive layer is polymerized, polycondensed or hardened and the layer is also homogenized by swelling in a fluorescence indicator solution.

Abstract: The proposed fibre-optic sensor is based on surface plasmon resonance and consists of a monomode fibre with multiple angled facets at its end face and suitable coatings. A first partial face is preferably metal-coated, a second is provided with a conventional detection layer, and the angle between the two partial surface is 30.degree., 45.degree. or 90.degree..