Fig. 1. Schematic diagram of the fluorescence imaging system

Fig. 2. Detector photo

Fig. 3. Schematic of the detector

Fig. 4. Flow chart of optical system design

Fig. 5. Schematic diagram of the fluorescence imaging test

Fig. 6. Underwater testing device

Fig. 7. Fluorescence signal images. (a) Before correction; (b) After correction; (Exposure time: 0.5 ms)

Fig. 8. The improvement in the signal-to-noise ratio of the fluorescent plate's fluorescent image after calibration, tested at a distance of 1.5 m

Fig. 9. Test fluorescence imaging. (a) Physical image; (b) Pre-correction fluorescence image; (c) Post-correction fluorescence image; (d) Non-fluorescent image

Fig. 10. Three-dimensional fluorescence signal diagram. (a) Before correction; (b) After correction; (c) After high concentration correction

Fig. 11. Exposure time 50 ms, different concentration of RhB solution fluorescence signal