TY  - JOUR
A1  - Munzke, Dorit
A1  - Saunders, John
A1  - Omrani, Hengameh
A1  - Reich, Oliver
A1  - Loock, Hans-Peter
T1  - Modeling of fiber-optic fluorescence probes for strongly absorbing samples
JF  - Applied optics
N2  - The dynamic range of fiber-optic fluorescent probes such as single fibers and fiber bundles is calculated for strongly absorbing samples, such as process liquids, foodstuffs, and lubricants. The model assumes an excitation beam profile based on a Lambertian light source and uses analytical forms of the collection efficiency, followed by an Abel transformation and numerical integration. It is found that the effect of primary absorption of the excitation light and secondary absorption of the fluorescence is profound. For fiber bundles and bifurcated fiber probes, the upper accessible concentration limit is roughly given by the absorption length of the primary and secondary absorption. Fluorescence detectors that are placed at right angles to the excitation beam axis or collinear to the beam axis are equally strongly affected by secondary absorption. A probe in which the same fiber is used for excitation and for collection of the fluorescence emerges as the fiber probe with the largest accessible concentration range.
Y1  - 2012
U6  - https://doi.org/10.1364/AO.51.006343
SN  - 1559-128X
SN  - 2155-3165
VL  - 51
IS  - 26
SP  - 6343
EP  - 6351
PB  - Optical Society of America
CY  - Washington
ER  -