Fig. 1From: Effects of seismic activity on the fluorescence signal of groundwaterSchematic functional sketch of the installed flow-through fluorometer of the type GUGN – FL30. The light sources with the specific wavelengths namely, 370 nm, 470 nm, 525 nm and 660 nm and corresponding detector ends are represented together with arrows perpendicular to the main water through flow tube (modified after Schnegg 2002)Back to article page