Device for measuring light-activated fluorescence and its use

A device for measuring fluorescence excited by light comprising:

• a) a support;
• b) at least one layer of a material applied to the support, the at least one layer of material having a planar fluorescing layer containing a fluorescing material;
• c) at least one light source which emits light of at least one wavelength which excites at least one fluorescence, and thus, fluorescent light, in the at least one layer;
• d) at least one first optical conductor which directs the light from the at least one light source directly into or in the direction of the at least one planar layer of material;
• e) at least one detector for measuring the intensity of the fluorescent light;
• f) at least one second optical conductor receiving the fluorescent light generated in the at least one layer, the at least one second optical conductor directing the fluorescent light onto the at least one detector;
• and
• g) a measuring head holding the at least one first optical conductor, the at least one second optical conductor, and the at least one light source;
• wherein the end faces of the at least one first optical conductor and the at least one second optical conductor are arranged relative to one another as a function of their numerical apertures to achieve accurate measured values of the intensity of the fluorescent light across the fluorescing layer being measured, and thereby permit accurate local assignment of values for the fluorescing layer, and wherein the at least one first optical conductor and the at least one second optical conductor are arranged in row arrangements, opposite one another in pairs, the rows being aligned parallel to a longitudinal axis of the measuring head, wherein the entry and/or exit cones of each first optical conductor in a pair arrangement overlap the entry and/or exit cones of each second optical conductor in the pair.