Figure 3
From: Study of probe-sample distance for biomedical spectra measurement
Collection efficiency of multi-fiber probes at normal illumination-collection (a) and at different illumination-collection angles (b). In this simulation, the fiber NA is assumed as 0.22 NA = 0.22. r c = 10 μm. Note that there is an optimal probe distance for multi-fiber probes. This optimal probe distance depends on the diameter of fiber. The signal can be increased by 5 fold if the probe is positioned at the optimal probe distance, compared with contact measurement. In (b) the diameter of the fiber is assumed to be 200 μm.